prof. UAM dr hab. Jacek Gapiński
Zainteresowania naukowe
- Struktura i dynamika miękkiej materii
- Optyczne metody badania dyfuzji w ośrodkach prostych i złożonych
- Egzotyczna mikroskopia optyczna (LSM, TIRF, FLIM, up-conversion)
Wykształcenie
- III Liceum Ogólnokształcące w Poznaniu, 1985
- magister fizyki, Wydział Matematyki i Fizyki UAM w Poznaniu, 1990
- doktor fizyki, Wydział Matematyki i Fizyki UAM w Poznaniu, 1994
- habilitacja z fizyki, Wydział Fizyki UAM w Poznaniu, 2010
Inne informacje
Zatrudnienie: 1988: pomoc techniczna w ZBM; 1990: asystent w ZBM; 1994: adiunkt w ZBM; 2012: prof. UAM w ZBM
Staże zagraniczne:
- ok. 2 lat w postaci 1-4 miesięcznych wyjazdów do Max-Planck-Institut fuer Polymerforschung w Moguncji, Niemcy (grupa prof. E. W. Fischera)
- ok. roku w postaci 1-3 miesięcznych wyjazdów do Forschungszentrum Juelich, Niemcy (grupa prof. J. Dhonta)
- ok. roku w postaci 1-3 miesięcznych wyjazdów do Research Center of Crete, Grecja (prof. G. Fytas, D. Vlassopoulos)
- 3 wyjazdy 30-dniowe do Stanford University (Wydział Chemii, prof. Robert Pecora)
Wypromowani doktorzy:
- Tomasz Śliwa (2015) „Badania nad strukturą i właściwościami polimerów zbudowanych z poli(N-izopropyloakryloamidu) i ich potencjalne zastosowanie w medycynie”
Nagrody i wyróżnienia:
- Liczne Nagrody Rektora UAM
Przynależność do Towarzystw Naukowych:
- Polskie Towarzystwo Fizyczne, Polskie Towarzystwo Biofizyczne
2023
Varghese, Jeena; Mohammadi, Reza; Pochylski, Mikołaj; Babacic, Visnja; Gapiński, Jacek; Vogel, Nicolas; Butt, Hans-Juergen; Fytas, George; Graczykowski, Bartłomiej
Size-dependent nanoscale soldering of polystyrene colloidal crystals by supercritical fluids Journal Article
In: Journal of Colloid and Interface Science, vol. 633, pp. 314–322, 2023.
@article{Varghese2023,
title = {Size-dependent nanoscale soldering of polystyrene colloidal crystals by supercritical fluids},
author = {Jeena Varghese and Reza Mohammadi and Mikołaj Pochylski and Visnja Babacic and Jacek Gapiński and Nicolas Vogel and Hans-Juergen Butt and George Fytas and Bartłomiej Graczykowski},
url = {https://authors.elsevier.com/c/1gA9Z4-sDXVRI},
doi = {10.1016/j.jcis.2022.11.090},
year = {2023},
date = {2023-03-01},
urldate = {2023-03-01},
journal = {Journal of Colloid and Interface Science},
volume = {633},
pages = {314--322},
publisher = {Elsevier BV},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2022
Szewczyk, Jakub; Pochylski, Mikołaj; Szutkowski, Kosma; Kempiński, Mateusz; Mrówczyński, Radosław; Iatsunskyi, Igor; Gapiński, Jacek; Coy, Emerson
In-situ thickness control of centimetre-scale 2D-Like polydopamine films with large scalability Journal Article
In: Materials Today Chemistry, vol. 24, pp. 100935, 2022.
@article{Szewczyk2022,
title = {In-situ thickness control of centimetre-scale 2D-Like polydopamine films with large scalability},
author = {Jakub Szewczyk and Mikołaj Pochylski and Kosma Szutkowski and Mateusz Kempiński and Radosław Mrówczyński and Igor Iatsunskyi and Jacek Gapiński and Emerson Coy},
url = {https://doi.org/10.1016/j.mtchem.2022.100935},
doi = {10.1016/j.mtchem.2022.100935},
year = {2022},
date = {2022-06-01},
urldate = {2022-06-01},
journal = {Materials Today Chemistry},
volume = {24},
pages = {100935},
publisher = {Elsevier BV},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Varghese, Jeena; Gapiński, Jacek; Pochylski, Mikołaj
Brillouin spectroscopy: probing the acoustic vibrations in colloidal nanoparticles Incollection
In: Design, Fabrication, and Characterization of Multifunctional Nanomaterials, pp. 45–72, Elsevier, 2022.
@incollection{Varghese2022,
title = {Brillouin spectroscopy: probing the acoustic vibrations in colloidal nanoparticles},
author = {Jeena Varghese and Jacek Gapiński and Mikołaj Pochylski},
url = {https://doi.org/10.1016/b978-0-12-820558-7.00010-8},
doi = {10.1016/b978-0-12-820558-7.00010-8},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
booktitle = {Design, Fabrication, and Characterization of Multifunctional Nanomaterials},
pages = {45--72},
publisher = {Elsevier},
keywords = {},
pubstate = {published},
tppubtype = {incollection}
}
Vasileiadis, Thomas; DÁlvise, Tommaso Marchesi; Saak, Clara-Magdalena; Pochylski, Mikołaj; Harvey, Sean; Synatschke, Christopher V.; Gapiński, Jacek; Fytas, George; Backus, Ellen H. G.; Weil, Tanja; Graczykowski, Bartłomiej
Fast Light-Driven Motion of Polydopamine Nanomembranes Journal Article
In: Nano Letters, vol. 22, no. 2, pp. 578–585, 2022.
@article{Vasileiadis2021b,
title = {Fast Light-Driven Motion of Polydopamine Nanomembranes},
author = {Thomas Vasileiadis and Tommaso Marchesi DÁlvise and Clara-Magdalena Saak and Mikołaj Pochylski and Sean Harvey and Christopher V. Synatschke and Jacek Gapiński and George Fytas and Ellen H. G. Backus and Tanja Weil and Bartłomiej Graczykowski},
url = {https://doi.org/10.1021/acs.nanolett.1c03165},
doi = {10.1021/acs.nanolett.1c03165},
year = {2022},
date = {2022-01-01},
journal = {Nano Letters},
volume = {22},
number = {2},
pages = {578--585},
publisher = {American Chemical Society (ACS)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Markiewicz, Roksana; Litowczenko, Jagoda; Gapiński, Jacek; Woźniak, Anna; Jurga, Stefan; Patkowski, Adam
Nanomolar Nitric Oxide Concentrations in Living Cells Measured by Means of Fluorescence Correlation Spectroscopy Journal Article
In: Molecules, vol. 27, no. 3, 2022, ISSN: 1420-3049.
Abstract | Links | BibTeX | Tagi:
@article{molecules27031010,
title = {Nanomolar Nitric Oxide Concentrations in Living Cells Measured by Means of Fluorescence Correlation Spectroscopy},
author = {Roksana Markiewicz and Jagoda Litowczenko and Jacek Gapiński and Anna Woźniak and Stefan Jurga and Adam Patkowski},
url = {https://www.mdpi.com/1420-3049/27/3/1010},
doi = {10.3390/molecules27031010},
issn = {1420-3049},
year = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {Molecules},
volume = {27},
number = {3},
abstract = {Measurement of the nitric oxide (NO) concentration in living cells in the physiological nanomolar range is crucial in understanding NO biochemical functions, as well as in characterizing the efficiency and kinetics of NO delivery by NO-releasing drugs. Here, we show that fluorescence correlation spectroscopy (FCS) is perfectly suited for these purposes, due to its sensitivity, selectivity, and spatial resolution. Using the fluorescent indicators, diaminofluoresceins (DAFs), and FCS, we measured the NO concentrations in NO-producing living human primary endothelial cells, as well as NO delivery kinetics, by an external NO donor to the immortal human epithelial living cells. Due to the high spatial resolution of FCS, the NO concentration in different parts of the cells were also measured. The detection of nitric oxide by means of diaminofluoresceins is much more efficient and faster in living cells than in PBS solutions, even though the conversion to the fluorescent form is a multi-step reaction.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2021
Richter, Łukasz; Księżarczyk, Karolina; Paszkowska, Karolina; Janczuk-Richter, Marta; Niedziółka-Jönsson, Joanna; Gapiński, Jacek; Łoś, Marcin; Hołyst, Robert; Paczesny, Jan
Adsorption of bacteriophages on polypropylene labware affects the reproducibility of phage research Journal Article
In: Scientific Reports, vol. 11, no. 1, pp. 7387, 2021, ISSN: 20452322.
Abstract | Links | BibTeX | Tagi: Bacteriophages, Biomedical engineering, Design, Nanobiotechnology, Polymers, Surface chemistry, synthesis and processing
@article{Richter2021,
title = {Adsorption of bacteriophages on polypropylene labware affects the reproducibility of phage research},
author = {Łukasz Richter and Karolina Księżarczyk and Karolina Paszkowska and Marta Janczuk-Richter and Joanna Niedziółka-Jönsson and Jacek Gapiński and Marcin Łoś and Robert Hołyst and Jan Paczesny},
url = {https://www.nature.com/articles/s41598-021-86571-x},
doi = {10.1038/s41598-021-86571-x},
issn = {20452322},
year = {2021},
date = {2021-12-01},
journal = {Scientific Reports},
volume = {11},
number = {1},
pages = {7387},
publisher = {Nature Research},
abstract = {Hydrophobicity is one of the most critical factors governing the adsorption of molecules and objects, such as virions, on surfaces. Even moderate change of wetting angle of plastic surfaces causes a drastic decrease ranging from 2 to 5 logs of the viruses (e.g., T4 phage) in the suspension due to adsorption on polymer vials' walls. The effect varies immensely in seemingly identical containers but purchased from different vendors. Comparison of glass, polyethylene, polypropylene, and polystyrene containers revealed a threshold in the wetting angle of around 95°: virions adsorb on the surface of more hydrophobic containers, while in more hydrophilic vials, phage suspensions are stable. The polypropylene surface of the Eppendorf-type and Falcon-type can accommodate from around 108 PFU/ml to around 1010 PFU/ml from the suspension. The adsorption onto the container's wall might result in complete scavenging of virions from the bulk. We developed two methods to overcome this issue. The addition of surfactant Tween20 and/or plasma treatment provides a remedy by modulating surface wettability and inhibiting virions' adsorption. Plastic containers are essential consumables in the daily use of many bio-laboratories. Thus, this is important not only for phage-related research (e.g., the use of phage therapies as an alternative for antibiotics) but also for data comparison and reproducibility in the field of biochemistry and virology.},
keywords = {Bacteriophages, Biomedical engineering, Design, Nanobiotechnology, Polymers, Surface chemistry, synthesis and processing},
pubstate = {published},
tppubtype = {article}
}
Litowczenko, Jagoda; Gapiński, Jacek; Markiewicz, Roksana; Woźniak, Anna; Wychowaniec, Jacek K; Peplińska, Barbara; Jurga, Stefan; Patkowski, Adam
Synthesis, characterization and in vitro cytotoxicity studies of poly-N-isopropyl acrylamide gel nanoparticles and films Journal Article
In: Materials Science and Engineering: C, vol. 118, pp. 111507, 2021, ISSN: 0928-4931.
Abstract | Links | BibTeX | Tagi: Cell cytotoxicity, Dynamic light scattering, Films, Hydrogels, Poly-N-isopropyl acrylamide (pNIPAM), Swelling and deswelling properties
@article{LITOWCZENKO2021111507,
title = {Synthesis, characterization and in vitro cytotoxicity studies of poly-N-isopropyl acrylamide gel nanoparticles and films},
author = {Jagoda Litowczenko and Jacek Gapiński and Roksana Markiewicz and Anna Woźniak and Jacek K Wychowaniec and Barbara Peplińska and Stefan Jurga and Adam Patkowski},
url = {http://www.sciencedirect.com/science/article/pii/S0928493120334251},
doi = {https://doi.org/10.1016/j.msec.2020.111507},
issn = {0928-4931},
year = {2021},
date = {2021-01-01},
journal = {Materials Science and Engineering: C},
volume = {118},
pages = {111507},
abstract = {In this work, we show synthesis that leads to thermoreponsive poly-N-isopropyl acrylamide (pNIPAM) nanogels with sizes below 100 nm, irrespectively of the surfactant to crosslinker ratio. We also show that in many environments the temperature induced pNIPAM collapse at Lower Critical Solution Temperature (LCST) of 32.5 °C is accompanied by gel nanoparticles' aggregation. Thus, the proper information on the nanoparticle (NP) structure and deswelling can be obtained only if the routinely measured hydrodynamic radius is supplemented by information on the molecular weight, which can be obtained from the intensity of scattered light. We measured the dynamics and reversibility of the deswelling and subsequent aggregation processes. Furthermore, we show that the highly concentrated pNIPAM gel NPs reversibly form bulk hydrogel networks of varied interconnected porous structure. We show, that in case of drying pNIPAM gel NPs above the LCST, it is possible to obtain films with 20-fold increase in storage modulus (G′) compared to hydrogel networks measured at room temperature. They exhibit temperature hysteresis behavior around LCST of 32.5 °C similar to pNIPAM films. Finally, we show that these hydrogel films, lead to extended proliferation of cells across three different types: fibroblast, endothelial and cancer cells. Additionally, none of the films exhibited any cytotoxic effects. Our study brings new insights into physicochemical characterization of pNIPAM gel NPs and networks behavior in realistic conditions of in vitro measurements, especially by means of dynamic light scattering as well as final unique properties of both gel NPs and formed porous films for possible tissue engineering applications.},
keywords = {Cell cytotoxicity, Dynamic light scattering, Films, Hydrogels, Poly-N-isopropyl acrylamide (pNIPAM), Swelling and deswelling properties},
pubstate = {published},
tppubtype = {article}
}
2020
Wojnarowska, Żaneta; Musiał, Małgorzata; Cheng, Shinian; Gapiński, Jacek; Patkowski, Adam; Pionteck, Jürgen; Paluch, Marian
Revealing Fast Proton Transport in Condensed Matter by Means of Density Scaling Concept Journal Article
In: The Journal of Physical Chemistry C, vol. 124, no. 29, pp. 15749–15756, 2020.
@article{Wojnarowska_2020,
title = {Revealing Fast Proton Transport in Condensed Matter by Means of Density Scaling Concept},
author = {Żaneta Wojnarowska and Małgorzata Musiał and Shinian Cheng and Jacek Gapiński and Adam Patkowski and Jürgen Pionteck and Marian Paluch},
url = {https://doi.org/10.1021%2Facs.jpcc.0c03548},
doi = {10.1021/acs.jpcc.0c03548},
year = {2020},
date = {2020-06-01},
journal = {The Journal of Physical Chemistry C},
volume = {124},
number = {29},
pages = {15749--15756},
publisher = {American Chemical Society (ACS)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Szewczyk, Sebastian; Abram, Mateusz; Białek, Rafał; Haniewicz, Patrycja; Karolczak, Jerzy; Gapiński, Jacek; Kargul, Joanna; Gibasiewicz, Krzysztof
On the nature of uncoupled chlorophylls in the extremophilic photosystem I-light harvesting I supercomplex Journal Article
In: Biochimica et Biophysica Acta (BBA) - Bioenergetics, vol. 1861, no. 2, pp. 148136, 2020, ISSN: 00052728.
@article{Szewczyk2020,
title = {On the nature of uncoupled chlorophylls in the extremophilic photosystem I-light harvesting I supercomplex},
author = {Sebastian Szewczyk and Mateusz Abram and Rafał Białek and Patrycja Haniewicz and Jerzy Karolczak and Jacek Gapiński and Joanna Kargul and Krzysztof Gibasiewicz},
url = {https://linkinghub.elsevier.com/retrieve/pii/S0005272819301902},
doi = {10.1016/j.bbabio.2019.148136},
issn = {00052728},
year = {2020},
date = {2020-02-01},
journal = {Biochimica et Biophysica Acta (BBA) - Bioenergetics},
volume = {1861},
number = {2},
pages = {148136},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Jarzębski, Maciej; Siejak, Przemysław; Przeor, Monika; Gapiński, Jacek; Woźniak, Anna; Baranowska, Hanna Maria; Pawlicz, Jarosław; Baryła-Pankiewicz, Elżbieta; Szwajca, Anna
Fluorescent Submicron-Sized Poly(heptafluoro-n-butyl methacrylate) Particles with Long-Term Stability Journal Article
In: Molecules, vol. 25, no. 9, 2020, ISSN: 1420-3049.
Abstract | Links | BibTeX | Tagi:
@article{molecules25092013,
title = {Fluorescent Submicron-Sized Poly(heptafluoro-n-butyl methacrylate) Particles with Long-Term Stability},
author = {Maciej Jarzębski and Przemysław Siejak and Monika Przeor and Jacek Gapiński and Anna Woźniak and Hanna Maria Baranowska and Jarosław Pawlicz and Elżbieta Baryła-Pankiewicz and Anna Szwajca},
url = {https://www.mdpi.com/1420-3049/25/9/2013},
doi = {10.3390/molecules25092013},
issn = {1420-3049},
year = {2020},
date = {2020-01-01},
journal = {Molecules},
volume = {25},
number = {9},
abstract = {Fluorescent submicron particles of fluorinated methacrylate (HFMBA) with long-term stability have been synthesized and characterized with regard to their potential applications. Rhodamine B (RBITC) isothiocyanate was used as the fluorescent component. The core-shell structure of the particles effectively protected the dye against bleaching. HFBMA nanoparticle (NP) stability was confirmed after seven years of storage. Only slight differences were found in the polydispersity index (pdi) from 0.002 to 0.010. Particle size measurements were carried out using dynamic light scattering (DLS), nanoparticle tracking (NTA), and fluorescence correlation spectroscopy (FCS). The hydrodynamic diameter evaluated by different methods were in good agreement, respectively: 184-550 nm, 218-579 nm, and 236-508 nm. Particle and core morphology was estimated by using scanning and transmission electron microscopy (SEM and TEM). The ability to recognize particles in 3D as a reference sample in biological media has been confirmed by epifluorescence optical microscopy, confocal laser scanning microscopy, and super-resolution confocal microscopy (STED).},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Babačić, Višnja; Varghese, Jeena; Coy, Emerson; Kang, Eunsoo; Pochylski, Mikołaj; Gapiński, Jacek; Fytas, George; Graczykowski, Bartłomiej
Mechanical reinforcement of polymer colloidal crystals by supercritical fluids Journal Article
In: Journal of Colloid and Interface Science, vol. 579, pp. 786 - 793, 2020, ISSN: 0021-9797.
Abstract | Links | BibTeX | Tagi: Brillouin light scattering, Colloidal crystals, Phononic crystals, Photonic crystals, Plasticization
@article{BABACIC2020786,
title = {Mechanical reinforcement of polymer colloidal crystals by supercritical fluids},
author = {Višnja Babačić and Jeena Varghese and Emerson Coy and Eunsoo Kang and Mikołaj Pochylski and Jacek Gapiński and George Fytas and Bartłomiej Graczykowski},
url = {http://www.sciencedirect.com/science/article/pii/S0021979720308493},
doi = {https://doi.org/10.1016/j.jcis.2020.06.104},
issn = {0021-9797},
year = {2020},
date = {2020-01-01},
journal = {Journal of Colloid and Interface Science},
volume = {579},
pages = {786 - 793},
abstract = {Colloidal crystals realized by self-assembled polymer nanoparticles have prominent attraction as a platform for various applications from assembling photonic and phononic crystals, acoustic metamaterials to coating applications. However, the fragility of these systems limits their application horizon. In this work the uniform mechanical reinforcement and tunability of 3D polystyrene colloidal crystals by means of cold soldering are reported. This structural strengthening is achieved by high pressure gas (N2 or Ar) plasticization at temperatures well below the glass transition. Brillouin light scattering is employed to monitor in-situ the mechanical vibrations of the crystal and thereby determine preferential pressure, temperature and time ranges for soldering, i.e. formation of physical bonding among the nanoparticles while maintaining the shape and translational order. This low-cost method is potentially useful for fabrication and tuning of durable devices including applications in photonics, phononics, acoustic metamaterials, optomechanics, surface coatings and nanolithography.},
keywords = {Brillouin light scattering, Colloidal crystals, Phononic crystals, Photonic crystals, Plasticization},
pubstate = {published},
tppubtype = {article}
}
2019
Comez, L.; Fioretto, D.; Gapiński, Jacek; Monaco, G.; Patkowski, Adam; Steffen, W.
Inelastic x-ray scattering reveals the ergodic to nonergodic transition of salol, a liquid with local order Journal Article
In: Condensed Matter Physics, vol. 22, no. 4, pp. 43603, 2019.
Abstract | Links | BibTeX | Tagi:
@article{Comez2019,
title = {Inelastic x-ray scattering reveals the ergodic to nonergodic transition of salol, a liquid with local order},
author = {L. Comez and D. Fioretto and Jacek Gapiński and G. Monaco and Adam Patkowski and W. Steffen},
doi = {10.5488/CMP.22.43603},
year = {2019},
date = {2019-11-01},
journal = {Condensed Matter Physics},
volume = {22},
number = {4},
pages = {43603},
abstract = {We have studied the high-frequency dynamics of salol by inelastic x-ray scattering over a wide temperature range between 50 and 450 K, across the glass transition. We find that salol efficiently realizes the mechanism of dynamical arrest described by the mode-coupling theory, as manifested by a cusp singularity in the behaviour of the non-ergodicity parameter and a Q dependence of the critical non-ergodicity parameter that is in phase with the static structure factor. These results confront positively the mode-coupling theory with liquids with local order.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Stracy, Mathew; Wollman, Adam JM; Kaja, Elżbieta; Gapiński, Jacek; Lee, Ji-Eun; Leek, Victoria A; McKie, Shannon J; Mitchenall, Lesley A; Maxwell, Anthony; Sherratt, David J; Leake, Mark C; Zawadzki, Paweł
Single-molecule imaging of DNA gyrase activity in living Escherichia coli Journal Article
In: Nucleic Acids Research, vol. 47, no. 1, pp. 210-220, 2019.
@article{doi:10.1093/nar/gky1143,
title = {Single-molecule imaging of DNA gyrase activity in living Escherichia coli},
author = {Mathew Stracy and Adam JM Wollman and Elżbieta Kaja and Jacek Gapiński and Ji-Eun Lee and Victoria A Leek and Shannon J McKie and Lesley A Mitchenall and Anthony Maxwell and David J Sherratt and Mark C Leake and Paweł Zawadzki},
url = {http://dx.doi.org/10.1093/nar/gky1143},
doi = {10.1093/nar/gky1143},
year = {2019},
date = {2019-01-10},
journal = {Nucleic Acids Research},
volume = {47},
number = {1},
pages = {210-220},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Pochylski, Mikołaj; Gapiński, Jacek; Wojnarowska, Z; Paluch, M; Patkowski, Adam
Nature of intramolecular dynamics in protic ionic glass-former: insight from ambient and high pressure Brillouin spectroscopy Journal Article
In: Journal of Molecular Liquids, vol. 282, pp. 51 - 56, 2019, ISSN: 0167-7322.
Abstract | Links | BibTeX | Tagi: Brillouin scattering, High pressure, Intramolecular dynamics, Ionic liquids
@article{POCHYLSKI201951,
title = {Nature of intramolecular dynamics in protic ionic glass-former: insight from ambient and high pressure Brillouin spectroscopy},
author = {Mikołaj Pochylski and Jacek Gapiński and Z Wojnarowska and M Paluch and Adam Patkowski},
url = {http://www.sciencedirect.com/science/article/pii/S0167732219302417},
doi = {https://doi.org/10.1016/j.molliq.2019.02.131},
issn = {0167-7322},
year = {2019},
date = {2019-01-01},
journal = {Journal of Molecular Liquids},
volume = {282},
pages = {51 - 56},
abstract = {Proton conducting materials play an important role in a variety of electrochemical devices. Especially, the class of protic ionic glass-formers with fast water-independent proton transport within the Grotthuss mechanism has been envisioned as promising fuel cell electrolytes. Nevertheless, despite a number of reports on protic ionic glasses the description of proton transport phenomenon in these systems is still incomplete. Herein, we employed the Brillouin scattering technique to investigate the intramolecular dynamics of acebutolol hydrochloride, protic ionic glass-former with isomerization ability. The studies performed at ambient and elevated pressure revealed the fast relaxation dynamics that may control the proton conductivity, especially at temperatures T < Tg where the vehicle mechanism contribution is negligible.},
keywords = {Brillouin scattering, High pressure, Intramolecular dynamics, Ionic liquids},
pubstate = {published},
tppubtype = {article}
}
Kasprowicz, D; Chiasera, A; Chappini, A; Zur, L; Gapiński, Jacek; Chrunik, M; Majchrowski, A; Jastrzab, R; Ferrari, M
Up-conversion luminescence of RE3+ -doped polymer composites KGd(WO4)2&PMMA Journal Article
In: vol. 88, pp. 366 - 371, 2019, ISSN: 0925-3467.
Abstract | Links | BibTeX | Tagi: Composites, KGd(WO), Micro-crystals, PMMA, Rare earth ions, Up-conversion
@article{KASPROWICZ2019366,
title = {Up-conversion luminescence of RE3+ -doped polymer composites KGd(WO4)2&PMMA},
author = {D Kasprowicz and A Chiasera and A Chappini and L Zur and Jacek Gapiński and M Chrunik and A Majchrowski and R Jastrzab and M Ferrari},
url = {http://www.sciencedirect.com/science/article/pii/S0925346718307924},
doi = {https://doi.org/10.1016/j.optmat.2018.12.001},
issn = {0925-3467},
year = {2019},
date = {2019-01-01},
volume = {88},
pages = {366 - 371},
abstract = {Poly(methyl methacrylate) (PMMA)-based luminescent materials are of prime interest for many new optoelectronic devices. This work presents the spectroscopic properties of PMMA-based composites containing KGd(WO4)2:Yb3+/Er3+/Tm3+, KGd(WO4)2:Yb3+/Tm3+ and KGd(WO4)2:Yb3+/Er3+ powders. These systems exhibit effective multicolor up-conversion luminescence in VIS and NIR spectral range under 980 nm excitation. The vibrational properties of the composites were investigated for the first time using the μ-Raman spectroscopy. The obtained results suggest that the KGd(WO4)2:Yb3+/Er3+/Tm3+&PMMA integrated system can be successfully used as a new phosphor for the up-conversion based optoelectronic devices.},
keywords = {Composites, KGd(WO), Micro-crystals, PMMA, Rare earth ions, Up-conversion},
pubstate = {published},
tppubtype = {article}
}
Jarzębski, Maciej; Peplińska, Barbara; Florczak, Patryk; Gapiński, Jacek; Flak, Dorota; Mała, Patrycja; Ramanavicius, Arunas; Baryła-Pankiewicz, Elżbieta; Cisowska, Joanna Kobus-; Szwajca, Anna
Fluorescein ether-ester dyes for labeling of fluorinated methacrylate nanoparticles Journal Article
In: Journal of Photochemistry and Photobiology A: Chemistry, vol. 382, pp. 111956, 2019, ISSN: 1010-6030.
Abstract | Links | BibTeX | Tagi: Dynamic light scattering, Fluorescence correlation spectroscopy, Fluorescent fluorescein-derivatives, Fluorescent nanoparticles, Fluorinated nanoparticless, Nanoparticle tracking analysis
@article{JARZEBSKI2019111956,
title = {Fluorescein ether-ester dyes for labeling of fluorinated methacrylate nanoparticles},
author = {Maciej Jarzębski and Barbara Peplińska and Patryk Florczak and Jacek Gapiński and Dorota Flak and Patrycja Mała and Arunas Ramanavicius and Elżbieta Baryła-Pankiewicz and Joanna Kobus- Cisowska and Anna Szwajca},
url = {http://www.sciencedirect.com/science/article/pii/S1010603019304058},
doi = {https://doi.org/10.1016/j.jphotochem.2019.111956},
issn = {1010-6030},
year = {2019},
date = {2019-01-01},
journal = {Journal of Photochemistry and Photobiology A: Chemistry},
volume = {382},
pages = {111956},
abstract = {Fluorescent core-shell particles are used as versatile fluorophores in confocal microscopy based image analysis and as a colloidal model system to study short and long-range interactions. Bright and stable microspherical probes are proposed as promising materials, especially in bioimaging applications. The release of dyes from fluorescent polymer microspheres is undesirable. Covalent linking of dyes within polymeric spheres during the polymerization process can solve the problem of dye leaching. This requires, e.g. the introduction of reactive groups into the dyes. Its more lipophilic ester-ether derivatives considerably reduced fluorescence. The fluorescent quantum yield of prepared nanoparticles was determined to be below 10%. As-prepared nanoparticles exhibited a low refractive index (1.293–1.349), hence their use is recommended. Scanning electron microscope (SEM) images and the fluorescence correlation spectroscopy (FCS) measurements confirmed high polydispersity of synthesized particles (40–230 nm), and are in agreement with the dynamic light scattering (DLS) and nanoparticle tracking analysis (NTA) results (hydrodynamic diameters 203 ± 9, 548 ± 50, 146 ± 2 nm). The zeta potential of fluorescent 1H,1H-heptafluoro-n-butyl methacrylate (HFBMA) shell nanoparticles (NPs) with propargyl ether-esters, 2-methyl allyl ether-esters and allyl ether-esters of fluorescein was -44.5,-14, -44.7 mV, respectively. The values are different despite the slight difference in the structure of ester-ether derivatives.},
keywords = {Dynamic light scattering, Fluorescence correlation spectroscopy, Fluorescent fluorescein-derivatives, Fluorescent nanoparticles, Fluorinated nanoparticless, Nanoparticle tracking analysis},
pubstate = {published},
tppubtype = {article}
}
2018
Boś-Liedke, Agnieszka; Walawender, Magdalena; Woźniak, Anna; Flak, Dorota; Gapiński, Jacek; Jurga, Stefan; Kucińska, Małgorzata; Plewiński, Adam; Murias, Marek; Elewa, Marwa; Lampp, Lisa; Imming, Peter; Tadyszak, Krzysztof
EPR Oximetry Sensor-Developing a TAM Derivative for In Vivo Studies Journal Article
In: Cell Biochemistry and Biophysics, vol. 76, no. 1, pp. 19–28, 2018, ISSN: 1559-0283.
@article{Boś-Liedke2018,
title = {EPR Oximetry Sensor-Developing a TAM Derivative for In Vivo Studies},
author = {Agnieszka Boś-Liedke and Magdalena Walawender and Anna Woźniak and Dorota Flak and Jacek Gapiński and Stefan Jurga and Małgorzata Kucińska and Adam Plewiński and Marek Murias and Marwa Elewa and Lisa Lampp and Peter Imming and Krzysztof Tadyszak},
url = {https://doi.org/10.1007/s12013-017-0824-3},
doi = {10.1007/s12013-017-0824-3},
issn = {1559-0283},
year = {2018},
date = {2018-06-01},
journal = {Cell Biochemistry and Biophysics},
volume = {76},
number = {1},
pages = {19--28},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Łukarska, M; Jankowska, A; Gapiński, Jacek; Valable, S; Anfray, C; Menard, B; Mintova, S; Kowalak, S
Encapsulation of fluorescein into nanozeolites L and Y Journal Article
In: Microporous and Mesoporous Materials, vol. 260, pp. 70–75, 2018, ISSN: 13871811.
Abstract | Links | BibTeX | Tagi:
@article{ukarska2018,
title = {Encapsulation of fluorescein into nanozeolites L and Y},
author = {M Łukarska and A Jankowska and Jacek Gapiński and S Valable and C Anfray and B Menard and S Mintova and S Kowalak},
url = {https://www.sciencedirect.com/science/article/pii/S1387181117306959 http://linkinghub.elsevier.com/retrieve/pii/S1387181117306959},
doi = {10.1016/j.micromeso.2017.10.040},
issn = {13871811},
year = {2018},
date = {2018-04-01},
journal = {Microporous and Mesoporous Materials},
volume = {260},
pages = {70--75},
publisher = {Elsevier},
abstract = {Fluorescein (F) species were encapsulated inside nanosized zeolites L and Y by their synthesis from adsorbed precursors (phthalic anhydride (Ph) and resorcinol (R)). The applied nanozeolites were modified either with H+ or Zn2+ cations and they played roles of the catalysts for synthesis of F and of the matrices for resulting dye molecules. The F loading, its tautomeric forms and optical properties of obtained composites depended on zeolite structure, morphology and on introduced cations. The composites usually showed higher fluorescence intensity than the pristine dye. The highest fluorescence intensity was noticed for the sample with nano-ZnL matrix. This intensity was much higher than that observed for composite with conventional micro-sized Zn L zeolite. Regarding an efficient fluorescence and nanosize of the obtained composites they seem promising fluorescent tracer for medical (theranostic) applications.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Skupin-Mrugalska, Paulina; Sobotta, Lukasz; Warowicka, Alicja; Wereszczynska, Beata; Zalewski, Tomasz; Gierlich, Piotr; Jarek, Marcin; Nowaczyk, Grzegorz; Kempka, Marek; Gapiński, Jacek; Jurga, Stefan; Mielcarek, Jadwiga
Theranostic liposomes as a bimodal carrier for magnetic resonance imaging contrast agent and photosensitizer Journal Article
In: Journal of Inorganic Biochemistry, vol. 180, pp. 1–14, 2018, ISSN: 01620134.
Abstract | Links | BibTeX | Tagi:
@article{Skupin-Mrugalska2018,
title = {Theranostic liposomes as a bimodal carrier for magnetic resonance imaging contrast agent and photosensitizer},
author = {Paulina Skupin-Mrugalska and Lukasz Sobotta and Alicja Warowicka and Beata Wereszczynska and Tomasz Zalewski and Piotr Gierlich and Marcin Jarek and Grzegorz Nowaczyk and Marek Kempka and Jacek Gapiński and Stefan Jurga and Jadwiga Mielcarek},
url = {http://linkinghub.elsevier.com/retrieve/pii/S0162013417305366},
doi = {10.1016/j.jinorgbio.2017.11.025},
issn = {01620134},
year = {2018},
date = {2018-03-01},
journal = {Journal of Inorganic Biochemistry},
volume = {180},
pages = {1--14},
abstract = {The present study is focused on the development of liposomes bearing gadolinium chelate (GdLip) providing two functionalities for magnetic resonance imaging (MRI) and photodynamic therapy of cancer. A lipid derivative of gadolinium(III) diethylenetriamine pentaacetic acid salt (GdDTPA1) was inserted in the liposomal membrane and served as MRI contrast agent whereas a zinc phthalocyanine (ZnPc) was used as a model photosensitizer. In addition to conventional liposomes, pegylated lipids were used for the preparation of “stealth” liposomes. The characterization of different GdLip formulations involved evaluation of the liposomes size by nanoparticle tracking analysis, thermal phase behavior by differential scanning calorimetry and ZnPc-mediated singlet oxygen production. Furthermore, relaxivity measurements were performed as well as cytotoxicity and photodynamic activity against cancerous and normal cell lines was studied. Size and thermal behavior were only slightly influenced by GdLip composition, however it distinctly affected singlet oxygen production of ZnPc-loaded GdLip. The quantum yields of singlet oxygen generation by zinc phthalocyanine incorporated in GdLip containing cationic or/and pegylated lipids were smaller than those obtained for non-pegylated carriers with l-$alpha$-phosphatidylglycerol. In general, all formulations of GdLip, irrespectively of composition, were characterized by relaxivities higher than those of commercially used contrast agents (e.g. Magnevisttextregistered). NMR study has shown that the incorporation of ZnPc into the formulations of GdLip increases the relaxation parameters r1 and r2, compared to the values for the non-loaded vesicles. GdDTPA1 did not influence the photodynamic activity of ZnPc against HeLa cells.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Ivashchenko, Olena; Peplinska, Barbara; Gapiński, Jacek; Flak, Dorota; Jarek, Marcin; Zaleski, Karol; Nowaczyk, Grzegorz; Pietralik, Zuzanna; Jurga, Stefan
Silver and ultrasmall iron oxides nanoparticles in hydrocolloids: effect of magnetic field and temperature on self-organization Journal Article
In: Scientific Reports, vol. 8, no. 1, pp. 4041, 2018, ISSN: 2045-2322.
Abstract | Links | BibTeX | Tagi:
@article{Ivashchenko2018,
title = {Silver and ultrasmall iron oxides nanoparticles in hydrocolloids: effect of magnetic field and temperature on self-organization},
author = {Olena Ivashchenko and Barbara Peplinska and Jacek Gapiński and Dorota Flak and Marcin Jarek and Karol Zaleski and Grzegorz Nowaczyk and Zuzanna Pietralik and Stefan Jurga},
url = {https://doi.org/10.1038/s41598-018-22426-2},
doi = {10.1038/s41598-018-22426-2},
issn = {2045-2322},
year = {2018},
date = {2018-01-01},
journal = {Scientific Reports},
volume = {8},
number = {1},
pages = {4041},
abstract = {Micro/nanostructures, which are assembled from various nanosized building blocks are of great scientific interests due to their combined features in the micro- and nanometer scale. This study for the first time demonstrates that ultrasmall superparamagnetic iron oxide nanoparticles can change the microstructure of their hydrocolloids under the action of external magnetic field. We aimed also at the establishment of the physiological temperature (39 textdegreeC) influence on the self-organization of silver and ultrasmall iron oxides nanoparticles (NPs) in hydrocolloids. Consequences of such induced changes were further investigated in terms of their potential effect on the biological activity in vitro. Physicochemical characterization included X-ray diffraction (XRD), optical microscopies (SEM, cryo-SEM, TEM, fluorescence), dynamic light scattering (DLS) techniques, energy dispersive (EDS), Fourier transform infrared (FTIR) and ultraviolet-visible (UV-Vis) spectroscopies, zeta-potential and magnetic measurements. The results showed that magnetic field affected the hydrocolloids microstructure uniformity, fluorescence properties and photodynamic activity. Likewise, increased temperature caused changes in NPs hydrodynamic size distribution and in hydrocolloids microstructure. Magnetic field significantly improved photodynamic activity that was attributed to enhanced generation of reactive oxygen species due to reorganization of the microstructure.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Meier, G; Gapiński, Jacek; Ratajczyk, M; Lettinga, M P; Hirtz, K; Banachowicz, Ewa; Patkowski, Adam
In: The Journal of Chemical Physics, vol. 148, no. 9, pp. 094201, 2018.
@article{Meier2018,
title = {Nano-viscosity of supercooled liquid measured by fluorescence correlation spectroscopy: Pressure and temperature dependence and the density scaling},
author = {G Meier and Jacek Gapiński and M Ratajczyk and M P Lettinga and K Hirtz and Ewa Banachowicz and Adam Patkowski},
url = {https://doi.org/10.1063/1.5011196},
doi = {10.1063/1.5011196},
year = {2018},
date = {2018-01-01},
journal = {The Journal of Chemical Physics},
volume = {148},
number = {9},
pages = {094201},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2017
Wojnarowska, Z; Rams-Baron, M; Knapik-Kowalczuk, J; Połatyńska, Agnieszka; Pochylski, Mikołaj; Gapiński, Jacek; Patkowski, Adam; Wlodarczyk, P; Paluch, M
Experimental evidence of high pressure decoupling between charge transport and structural dynamics in a protic ionic glass-former Journal Article
In: Scientific Reports, vol. 7, no. 1, pp. 7084, 2017, ISSN: 2045-2322.
Abstract | Links | BibTeX | Tagi:
@article{Wojnarowska2017,
title = {Experimental evidence of high pressure decoupling between charge transport and structural dynamics in a protic ionic glass-former},
author = {Z Wojnarowska and M Rams-Baron and J Knapik-Kowalczuk and Agnieszka Połatyńska and Mikołaj Pochylski and Jacek Gapiński and Adam Patkowski and P Wlodarczyk and M Paluch},
url = {http://www.nature.com/articles/s41598-017-07136-5},
doi = {10.1038/s41598-017-07136-5},
issn = {2045-2322},
year = {2017},
date = {2017-12-01},
journal = {Scientific Reports},
volume = {7},
number = {1},
pages = {7084},
publisher = {Nature Publishing Group},
abstract = {textcopyright 2017 The Author(s). In this paper the relaxation dynamics of ionic glass-former acebutolol hydrochloride (ACB-HCl) is studied as a function of temperature and pressure by using dynamic light scattering and broadband dielectric spectroscopy. These unique experimental data provide the first direct evidence that the decoupling between the charge transport and structural relaxation exists in proton conductors over a wide T-P thermodynamic space, with the time scale of structural relaxation being constant at the liquid-glass transition ($tau$ $alpha$ = 1000 s). We demonstrate that the enhanced proton transport, being a combination of intermolecular H + hopping between cation and anion as well as tautomerization process within amide moiety of ACB molecule, results in a breakdown of the Stokes-Einstein relation at ambient and elevated pressure with the fractional exponent k being pressure dependent. The dT g /dP coefficient, stretching exponent $beta$ KWW and dynamic modulus E a /$Delta$V # were found to be the same regardless of the relaxation processes studied. This is in contrast to the apparent activation volume parameter that is different when charge transport and structural dynamics are considered. These experimental results together with theoretical considerations create new ideas to design efficient proton conductors for potential electrochemical applications.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Coy, Emerson; Graczyk, Piotr; Yate, Luis; Załęski, Karol; Gapiński, Jacek; Kuświk, Piotr; Mielcarek, Sławomir; Stobiecki, Feliks; Mróz, Bogusław; Ferrater, Cesar; Jurga, Stefan
Second Harmonic Generation Response in Thermally reconstructed Multiferroic $beta$′- Gd2(MoO4)3 Thin Films Journal Article
In: Scientific Reports, vol. 7, no. 1, pp. 11800, 2017, ISSN: 2045-2322.
Abstract | Links | BibTeX | Tagi:
@article{Coy2017,
title = {Second Harmonic Generation Response in Thermally reconstructed Multiferroic $beta$′- Gd2(MoO4)3 Thin Films},
author = {Emerson Coy and Piotr Graczyk and Luis Yate and Karol Załęski and Jacek Gapiński and Piotr Kuświk and Sławomir Mielcarek and Feliks Stobiecki and Bogusław Mróz and Cesar Ferrater and Stefan Jurga},
url = {http://www.nature.com/articles/s41598-017-12370-y},
doi = {10.1038/s41598-017-12370-y},
issn = {2045-2322},
year = {2017},
date = {2017-12-01},
journal = {Scientific Reports},
volume = {7},
number = {1},
pages = {11800},
publisher = {Nature Publishing Group},
abstract = {Gd2(MoO4)3 (GMO) is a well-studied multiferroic material that exhibits full ferroelectric and ferroelastic behavior at room temperature. However, its difficult stabilization in thin films has prevented the study and exploitation of its multiferroic properties in different architectures. Here, we report on the study of GMO thin films deposited on Si(001) substrates by Pulsed Laser Deposition (PLD). The physicochemical properties of the films are discussed and studied. Results obtained by X-ray diffraction, X-ray photoelectron spectroscopy, high resolution transmission microscopy and second harmonic generation show that the orthorhombic ($beta$′-GMO) multiferroic phase can be stabilized and homogenized by post deposition thermal reconstruction. Finally, the reconstruction process takes place via a complex surface mechanism with a clear leaf-like behavior.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Jarzębski, Maciej; Śliwa, Tomasz; Peplińska, Barbara; Jakubowicz, Jarosław; Kuzioła, Rafał; Kościński, Jeremi; Białopiotrowicz, Tomasz; Gapiński, Jacek
Submicron sized fluorescent silica particles characterization Journal Article
In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, vol. 411, pp. 78–84, 2017, ISSN: 0168583X.
Abstract | Links | BibTeX | Tagi:
@article{Jarzebski2017,
title = {Submicron sized fluorescent silica particles characterization},
author = {Maciej Jarzębski and Tomasz Śliwa and Barbara Peplińska and Jarosław Jakubowicz and Rafał Kuzioła and Jeremi Kościński and Tomasz Białopiotrowicz and Jacek Gapiński},
url = {https://www.sciencedirect.com/science/article/pii/S0168583X17301118},
doi = {10.1016/j.nimb.2017.01.088},
issn = {0168583X},
year = {2017},
date = {2017-11-01},
journal = {Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms},
volume = {411},
pages = {78--84},
publisher = {North-Holland},
abstract = {Silica nano- and submicron particles are examples of commonly used nanomaterials with frequently modified surface properties. Various enhanced methods of the fluorescent particles preparations give the opportunities for applications of fluorescent SiO2as a model system for biomedical interactions between the particles and biostructures such as cells, including beam interactions with materials. Fluorescent core-shell structures were prepared by modified Stoeber method, where the fluorescent agent was included in the core and then surrounded by a protective shell. As a fluorescent agent Rhodamine-B isothiocyanate was used. The core-shell tunneling size structure was formed by addition of TEOS (tetraethyl orthosilicate) to the base mixture. The size of the particles were investigated by dynamic light scattering (DLS), nanoparticle tracking analysis (NTA), fluorescence correlation spectroscopy (FCS). Shape and morphology were studied by the transmission and scanning electron microscopy. The fluorescence behavior of the particles was confirmed using NTA in the fluorescent mode and LSM (laser scanning microscope). We confirmed the hydrodynamic diameter in the range between 300 and 1000 nm using the FCS technique. XRD spectra of fluorescent SiO2were also obtained. This study shows practical aspects of use of selected characterization methods for submicron particle characterization, especially with regard to their fluorescent behavior.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Ivashchenko, Olena; Gapiński, Jacek; Peplińska, Barbara; Przysiecka, Łucja; Zalewski, Tomasz; Nowaczyk, Grzegorz; Jarek, Marcin; Marcinkowska-Gapińska, Anna; Jurga, Stefan
In: Materials & Design, vol. 133, pp. 307–324, 2017, ISSN: 02641275.
Abstract | Links | BibTeX | Tagi:
@article{Ivashchenko2017a,
title = {Self-organizing silver and ultrasmall iron oxide nanoparticles prepared with ginger rhizome extract: Characterization, biomedical potential and microstructure analysis of hydrocolloids},
author = {Olena Ivashchenko and Jacek Gapiński and Barbara Peplińska and Łucja Przysiecka and Tomasz Zalewski and Grzegorz Nowaczyk and Marcin Jarek and Anna Marcinkowska-Gapińska and Stefan Jurga},
url = {https://www.sciencedirect.com/science/article/pii/S0264127517307475 http://linkinghub.elsevier.com/retrieve/pii/S0264127517307475},
doi = {10.1016/j.matdes.2017.08.001},
issn = {02641275},
year = {2017},
date = {2017-11-01},
journal = {Materials & Design},
volume = {133},
pages = {307--324},
publisher = {Elsevier},
abstract = {Multimodal nanoparticles (NPs) that may be used for therapies and diagnostics is the most promising trend for efficient therapy. We demonstrate that nanocomposite based on self-organizing silver and ultrasmall magnetic iron oxide NPs (MAg) produced in one-step synthesis revealed unique combination of fluorescence, bactericidal, fungicidal properties and have a potential as magnetic resonance imaging (MRI) contrast agent. Using the green chemistry approach, ginger (Zingiber officinale) rhizome extract was applied as capping agent for MAg synthesis, providing also additional fluorescent properties of NPs and inducing hydrocolloids structuring. The MAg were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive microanalysis (EDS), fluorescence microscopy, cryo-SEM, dynamic light scattering (DLS) techniques, Fourier transform infrared (FTIR) and ultraviolet–visible (UV–Vis) spectroscopies. MAg dispersions in water and some biological media are very stable which is important for biomedical application. The existence of microstructure in MAg hydrocolloids was proved. The hierarchical character and high ordering of this microstructure were discovered and its level-by-level building blocks were investigated. The microstructure was found to be responsible for fluorescence emittance of MAg hydrocolloids. The properties as well as potential application of the MAg hydrocolloids is yet to be discovered.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Poznar, Monika; Hołubowicz, Rafał; Wojtas, Magdalena; Gapiński, Jacek; Banachowicz, Ewa; Patkowski, Adam; Ożyhar, Andrzej; Dobryszycki, Piotr
Structural properties of the intrinsically disordered, multiple calcium ion-binding otolith matrix macromolecule-64 (OMM-64) Journal Article
In: Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics, vol. 1865, no. 11, pp. 1358–1371, 2017, ISSN: 15709639.
Abstract | Links | BibTeX | Tagi:
@article{Poznar2017,
title = {Structural properties of the intrinsically disordered, multiple calcium ion-binding otolith matrix macromolecule-64 (OMM-64)},
author = {Monika Poznar and Rafał Hołubowicz and Magdalena Wojtas and Jacek Gapiński and Ewa Banachowicz and Adam Patkowski and Andrzej Ożyhar and Piotr Dobryszycki},
url = {https://www.sciencedirect.com/science/article/pii/S1570963917302054?via%3Dihub http://linkinghub.elsevier.com/retrieve/pii/S1570963917302054},
doi = {10.1016/j.bbapap.2017.08.019},
issn = {15709639},
year = {2017},
date = {2017-11-01},
journal = {Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics},
volume = {1865},
number = {11},
pages = {1358--1371},
publisher = {Elsevier},
abstract = {Fish otoliths are calcium carbonate biominerals that are involved in hearing and balance sensing. An organic matrix plays a crucial role in their formation. Otolith matrix macromolecule-64 (OMM-64) is a highly acidic, calcium-binding protein (CBP) found in rainbow trout otoliths. It is a component of high-molecular-weight aggregates, which influence the size, shape and polymorph of calcium carbonate in vitro. In this study, a protocol for the efficient expression and purification of OMM-64 was developed. For the first time, the complete structural characteristics of OMM-64 were described. Various biophysical methods were combined to show that OMM-64 occurs as an intrinsically disordered monomer. Under denaturing conditions (pH, temperature) OMM-64 exhibits folding propensity. It was determined that OMM-64 binds approximately 61 calcium ions with millimolar affinity. The folding-unfolding experiments showed that calcium ions induced the collapse of OMM-64. The effect of other counter ions present in trout endolymph on OMM-64 conformational changes was studied. The significance of disordered properties of OMM-64 and the possible function of this protein is discussed.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Łukarska, M; Jankowska, A; Gapiński, Jacek; Valable, S; Anfray, C; Menard, B; Mintova, S; Kowalak, S
Synthesis of fluorescein by a ship-in-a-bottle method in different zeolites Journal Article
In: New Journal of Chemistry, vol. 41, no. 18, pp. 9969–9976, 2017, ISSN: 1144-0546.
Abstract | Links | BibTeX | Tagi:
@article{ukarska2017,
title = {Synthesis of fluorescein by a ship-in-a-bottle method in different zeolites},
author = {M Łukarska and A Jankowska and Jacek Gapiński and S Valable and C Anfray and B Menard and S Mintova and S Kowalak},
url = {http://xlink.rsc.org/?DOI=C7NJ01427A},
doi = {10.1039/C7NJ01427A},
issn = {1144-0546},
year = {2017},
date = {2017-09-01},
journal = {New Journal of Chemistry},
volume = {41},
number = {18},
pages = {9969--9976},
publisher = {The Royal Society of Chemistry},
abstract = {Composites consisting of fluorescein (F) entrapped inside various zeolite structures ( i.e. FAU, LTL, MFI, and LTA) were prepared by catalytic synthesis of the dye from its precursors (phthalic anhydride and resorcinol) adsorbed in the zeolites.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Śliwa, Tomasz; Jarzębski, Maciej; Andrzejewska, Ewa; Szafran, Mikołaj; Gapiński, Jacek
Uptake and controlled release of a dye from thermo-sensitive polymer P(NIPAM- co -Vim) Journal Article
In: Reactive and Functional Polymers, vol. 115, pp. 102–108, 2017, ISSN: 13815148.
Abstract | Links | BibTeX | Tagi:
@article{Sliwa2017,
title = {Uptake and controlled release of a dye from thermo-sensitive polymer P(NIPAM- co -Vim)},
author = {Tomasz Śliwa and Maciej Jarzębski and Ewa Andrzejewska and Mikołaj Szafran and Jacek Gapiński},
url = {https://www.sciencedirect.com/science/article/pii/S1381514817300718?via%3Dihub http://linkinghub.elsevier.com/retrieve/pii/S1381514817300718},
doi = {10.1016/j.reactfunctpolym.2017.04.003},
issn = {13815148},
year = {2017},
date = {2017-06-01},
journal = {Reactive and Functional Polymers},
volume = {115},
pages = {102--108},
publisher = {Elsevier},
abstract = {Copolymers of N-isopropylacrylamide (PNIPAM) are one of the most promising microgel materials for medical applications, especially as a drug carrier. PNIPAMs present unique properties, such as size variation with changing pH and/or temperature. The results of a study on the uptake and release of a dye (Orange II) by microgels of N-isopropylacrylamide copolymer with 1-vinylimidazole (P(NIPAM-co-Vim) are presented. The dye was used as a model low-molecular substance. Hydrodynamic radius (Rh) of P(NIPAM-co-Vim) particles was measured by dynamic light scattering as a function of temperature in two pH environments: acidic and basic. The dye particles contraction was monitored as a function of temperature at pH 4. The measurements of the zeta potential indicated a positive charge of P(NIPAM-co-Vim) particles at pH 4 and a negative one at pH 9. The key experiments were the internalization and the release of the dye. The effectiveness of this process was measured by UV-Vis spectroscopy on the supernatant derived from centrifuged P(NIPAM-co-Vim) suspension. At room temperature the efficiency of trapping of the dye by the microgel at pH 4 was 87%. Changing pH of a sample initially saturated with the dye from 4 to 9 led to a complete release of the trapped dye.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Ivashchenko, Olena; Woźniak, Anna; Coy, Emerson; Peplinska, Barbara; Gapiński, Jacek; Jurga, Stefan
Release and cytotoxicity studies of magnetite/Ag/antibiotic nanoparticles: An interdependent relationship Journal Article
In: Colloids and Surfaces B: Biointerfaces, vol. 152, pp. 85–94, 2017, ISSN: 18734367.
Abstract | Links | BibTeX | Tagi:
@article{Ivashchenko2017b,
title = {Release and cytotoxicity studies of magnetite/Ag/antibiotic nanoparticles: An interdependent relationship},
author = {Olena Ivashchenko and Anna Woźniak and Emerson Coy and Barbara Peplinska and Jacek Gapiński and Stefan Jurga},
url = {https://www.sciencedirect.com/science/article/pii/S0927776517300176},
doi = {10.1016/j.colsurfb.2017.01.009},
issn = {18734367},
year = {2017},
date = {2017-04-01},
journal = {Colloids and Surfaces B: Biointerfaces},
volume = {152},
pages = {85--94},
publisher = {Elsevier},
abstract = {Though the cytotoxic properties of magnetite nanoparticles (NPs) are rather well investigated and known to be dose dependent and rather low, surface functionalization can drastically change their properties. To determine whether the cytotoxicity of magnetite/Ag/antibiotic NPs may be associated, among other things, with iron, silver and antibiotic release, this study investigates the release profiles and cytotoxicity of magnetite/Ag/rifampicin and magnetite/Ag/doxycycline NPs compares it similar profiles from magnetite, magnetite/Ag NPs and antibiotics. It was established that the studied NPs released not only water-soluble substances, such as antibiotics, but also poorly-soluble ones, such as iron and silver. The deposition of silver on the magnetite surface promotes the release of iron by the formation of a galvanic couple. Antibiotic adsorbed on the magnetite/Ag surface plays a dual role in the galvanic corrosion processes: as a corrosion inhibitor for iron oxides and as a corrosion promoter for silver. Magnetite/Ag/rifampicin and magnetite/Ag/doxycycline. NPs were found to have greater cytotoxicity towards the HEK293T cell line than magnetite NPs. These results were attributed to the combined toxic action of the released iron, silver ions and antibiotics. Intensive and simultaneous release of the NP components caused cell stress and suppressed their growth.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Połatyńska, Agnieszka; Tomczyk, Karolina; Pochylski, Mikołaj; Meier, Gerd; Gapiński, Jacek; Banachowicz, Ewa; Śliwa, Tomasz; Patkowski, Adam
Temperature dependent FCS studies using a long working distance objective: Viscosities of supercooled liquids and particle size Journal Article
In: Journal of Chemical Physics, vol. 146, no. 8, pp. 084506, 2017, ISSN: 00219606.
Abstract | Links | BibTeX | Tagi:
@article{Poatynska2017,
title = {Temperature dependent FCS studies using a long working distance objective: Viscosities of supercooled liquids and particle size},
author = {Agnieszka Połatyńska and Karolina Tomczyk and Mikołaj Pochylski and Gerd Meier and Jacek Gapiński and Ewa Banachowicz and Tomasz Śliwa and Adam Patkowski},
url = {http://aip.scitation.org/doi/10.1063/1.4977047},
doi = {10.1063/1.4977047},
issn = {00219606},
year = {2017},
date = {2017-02-01},
journal = {Journal of Chemical Physics},
volume = {146},
number = {8},
pages = {084506},
publisher = {AIP Publishing LLC},
abstract = {In this work, we describe new experimental setups for Fluorescence Correlation Spectroscopy (FCS) where a long working distance objective is used. Using these setups, FCS measurements in a broad temperature range for a small sample volume of about 50 $mu$l can be performed. The use of specially designed cells and a dry long working distance objective was essential for avoiding temperature gradients in the sample. The performance of the new setups and a traditional FCS setup with immersion objectives is compared. The FCS data in combination with the Stokes-Einstein (SE) relation were used to obtain the values of the nanoviscosity of a fluid. We show for selected molecular van der Waals supercooled liquids that despite the fact that in these systems, a characteristic length scale can be defined, the nanoviscosity obtained from FCS is in a very good agreement with the macroscopic (rheometric) viscosity of the sample in a broad temperature range. This result corroborates the applicability of the SE relation to s...},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2016
Łukarska, Małgorzata; Jankowska, Aldona; Gapiński, Jacek; Valable, Samuel; Anfray, Clement; Menard, Benjamin; Mintova, Svetlana; Kowalak, Stanisław
Synthesis and encapsulation of fluorescein in zeolite Y Journal Article
In: Microporous and Mesoporous Materials, vol. 236, pp. 79–84, 2016, ISSN: 13871811.
Abstract | Links | BibTeX | Tagi:
@article{ukarska2016,
title = {Synthesis and encapsulation of fluorescein in zeolite Y},
author = {Małgorzata Łukarska and Aldona Jankowska and Jacek Gapiński and Samuel Valable and Clement Anfray and Benjamin Menard and Svetlana Mintova and Stanisław Kowalak},
url = {https://www.sciencedirect.com/science/article/pii/S138718111630018X http://linkinghub.elsevier.com/retrieve/pii/S138718111630018X},
doi = {10.1016/j.micromeso.2016.02.043},
issn = {13871811},
year = {2016},
date = {2016-12-01},
journal = {Microporous and Mesoporous Materials},
volume = {236},
pages = {79--84},
publisher = {Elsevier},
abstract = {Fluorescein was entrapped inside FAU type zeolite (Y) by generating it from resorcinol and phthalic anhydride. Prior to the formation of fluorescein, zeolite Y was modified with various cations (H, Zn, Ce, Na, K). The modified zeolite acted as catalysts for the fluorescein Friedel–Crafts reaction synthesis, while at the same time it played a role of matrix for the stabilization and homogeneous dispersion of the guest molecules. The nature of the different cations influenced the content of fluorescein generated in the zeolite, and favoured the formation of some dye isomers (i.e. anion, dianion, cation or transition metal complex). The contribution of different fluorescein derivatives in the products was reflected in their absorption and fluorescence properties. The H-, Ce-, and Zn- containing Y zeolites revealed the highest content of fluorescein due to their distinct acid active sites. The composites with H- and ZnY zeolites indicated much higher fluorescence than that of the pristine fluorescein. Moreover, fluorescein in zeolite Y matrices did not show any photobleaching under continuous illumination ($łambda$ = 730 nm, in a two-photon experiment for 180 s), which suggests that these materials could be used for biomedical applications.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Babayevska, N; Peplińska, B; Jarek, M; Yate, L; Tadyszak, K; Gapiński, Jacek; Iatsunskyi, I; Jurga, S
Synthesis, structure, EPR studies and up-conversion luminescence of ZnO:Er 3+ –Yb 3+ @Gd 2 O 3 nanostructures Journal Article
In: RSC Advances, vol. 6, no. 92, pp. 89305–89312, 2016, ISSN: 2046-2069.
Abstract | Links | BibTeX | Tagi:
@article{Babayevska2016,
title = {Synthesis, structure, EPR studies and up-conversion luminescence of ZnO:Er 3+ –Yb 3+ @Gd 2 O 3 nanostructures},
author = {N Babayevska and B Peplińska and M Jarek and L Yate and K Tadyszak and Jacek Gapiński and I Iatsunskyi and S Jurga},
url = {http://xlink.rsc.org/?DOI=C6RA18393J},
doi = {10.1039/C6RA18393J},
issn = {2046-2069},
year = {2016},
date = {2016-09-01},
journal = {RSC Advances},
volume = {6},
number = {92},
pages = {89305--89312},
publisher = {The Royal Society of Chemistry},
abstract = {ZnO:Er 3+ –Yb 3+ @Gd 2 O 3 nanostructures were obtained by “ wet ” chemistry methods – the sol–gel technique for the preparation of ZnO and ZnO:Er 3+ –Yb 3+ nanoparticles (NPs), and the seed deposition method for obtaining Gd 2 O 3 .},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Mazuryk, Jarosław; Deptuła, Tobiasz; Polchi, Alice; Gapiński, Jacek; Giovagnoli, Stefano; Magini, Alessandro; Emiliani, Carla; Kohlbrecher, Joachim; Patkowski, Adam
Rapamycin-loaded solid lipid nanoparticles: Morphology and impact of the drug loading on the phase transition between lipid polymorphs Journal Article
In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, vol. 502, pp. 54–65, 2016, ISSN: 09277757.
Abstract | Links | BibTeX | Tagi:
@article{Mazuryk2016,
title = {Rapamycin-loaded solid lipid nanoparticles: Morphology and impact of the drug loading on the phase transition between lipid polymorphs},
author = {Jarosław Mazuryk and Tobiasz Deptuła and Alice Polchi and Jacek Gapiński and Stefano Giovagnoli and Alessandro Magini and Carla Emiliani and Joachim Kohlbrecher and Adam Patkowski},
url = {https://www.sciencedirect.com/science/article/pii/S0927775716303259 http://linkinghub.elsevier.com/retrieve/pii/S0927775716303259},
doi = {10.1016/j.colsurfa.2016.05.017},
issn = {09277757},
year = {2016},
date = {2016-08-01},
journal = {Colloids and Surfaces A: Physicochemical and Engineering Aspects},
volume = {502},
pages = {54--65},
publisher = {Elsevier},
abstract = {In recent decades solid lipid nanoparticles (SLN) have become a well-performing tool for the site-targeted delivery of water-insoluble drugs. In this study, Compritoltextregistered 888 ATO-based SLN, coated with polysorbate 80, were loaded with rapamycin (Rap), a lipophilic immunomodulator, broadly-used in therapies of cancer and neurodegenerative diseases. Rap-SLN were formulated using cold high-pressure homogenization and ultrasound-assisted emulsion. The exploitation of these methods yielded the nanoparticles of various values of zeta-potential (from −1mV to −20mV) and efficacies of the Rap entrapment (from 37.5±2.3% to 77.0±5.4%). The SEM and AFM imaging and shape-modeling by the combined DLS-SANS analysis revealed that the Rap-SLN of the hydrodynamic radius of ∼46nm preserve the platelet-like or flat ellipsoidal structure with a thickness as large as 8–9nm. These dimensions correspond to a single lipid bilayer, organized in a triclinic L$beta$ polymorph, and covered with a 1–2-nm shell of the surfactant. Consistently, FT-IR spectra acquired in the range 52–75°C, showed that the Rap incorporation within the lipid matrix decreases the point of the gel-liquid crystalline (L$beta$-L$alpha$) phase transition. These outcomes imply a thermodynamically-driven mechanism of the Rap release from SLN.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Polchi, Alice; Magini, Alessandro; Mazuryk, Jarosław; Tancini, Brunella; Gapiński, Jacek; Patkowski, Adam; Giovagnoli, Stefano; Emiliani, Carla
Rapamycin Loaded Solid Lipid Nanoparticles as a New Tool to Deliver mTOR Inhibitors: Formulation and in Vitro Characterization Journal Article
In: Nanomaterials, vol. 6, no. 5, pp. 87, 2016, ISSN: 2079-4991.
Abstract | Links | BibTeX | Tagi:
@article{Polchi2016,
title = {Rapamycin Loaded Solid Lipid Nanoparticles as a New Tool to Deliver mTOR Inhibitors: Formulation and in Vitro Characterization},
author = {Alice Polchi and Alessandro Magini and Jarosław Mazuryk and Brunella Tancini and Jacek Gapiński and Adam Patkowski and Stefano Giovagnoli and Carla Emiliani},
url = {http://www.mdpi.com/2079-4991/6/5/87},
doi = {10.3390/nano6050087},
issn = {2079-4991},
year = {2016},
date = {2016-05-01},
journal = {Nanomaterials},
volume = {6},
number = {5},
pages = {87},
publisher = {Multidisciplinary Digital Publishing Institute},
abstract = {Recently, the use of mammalian target of rapamycin (mTOR) inhibitors, in particular rapamycin (Rp), has been suggested to improve the treatment of neurodegenerative diseases. However, as Rp is a strong immunosuppressant, specific delivery to the brain has been postulated to avoid systemic exposure. In this work, we fabricated new Rp loaded solid lipid nanoparticles (Rp-SLN) stabilized with polysorbate 80 (PS80), comparing two different methods and lipids. The formulations were characterized by differential scanning calorimetry (DSC), nuclear magnetic resonance (NMR), wide angle X-ray scattering (WAXS), cryo-transmission electron microscopy (cryo-TEM), dynamic light scattering (DLS) and particle tracking. In vitro release and short-term stability were assessed. Biological behavior of Rp-SLN was tested in SH-SY5Y neuroblastoma cells. The inhibition of mTOR complex 1 (mTORC1) was evaluated over time by a pulse-chase study compared to free Rp and Rp nanocrystals. Compritol Rp-SLN resulted more stable and possessing proper size and surface properties with respect to cetyl palmitate Rp-SLN. Rapamycin was entrapped in an amorphous form in the solid lipid matrix that showed partial crystallinity with stable L$beta$, sub-L$alpha$ and L$beta$′ arrangements. PS80 was stably anchored on particle surface. No drug release was observed over 24 h and Rp-SLN had a higher cell uptake and a more sustained effect over a week. The mTORC1 inhibition was higher with Rp-SLN. Overall, compritol Rp-SLN show suitable characteristics and stability to be considered for further investigation as Rp brain delivery system.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Michalska, Martyna; Florczak, Anna; Dams-Kozlowska, Hanna; Gapiński, Jacek; Jurga, Stefan; ë, Rapha
Peptide-functionalized ZCIS QDs as fluorescent nanoprobe for targeted HER2-positive breast cancer cells imaging Journal Article
In: Acta Biomaterialia, vol. 35, pp. 293–304, 2016, ISSN: 17427061.
Abstract | Links | BibTeX | Tagi:
@article{Michalska2016,
title = {Peptide-functionalized ZCIS QDs as fluorescent nanoprobe for targeted HER2-positive breast cancer cells imaging},
author = {Martyna Michalska and Anna Florczak and Hanna Dams-Kozlowska and Jacek Gapiński and Stefan Jurga and Rapha ë},
url = {https://www.sciencedirect.com/science/article/pii/S1742706116300459 http://linkinghub.elsevier.com/retrieve/pii/S1742706116300459},
doi = {10.1016/j.actbio.2016.02.002},
issn = {17427061},
year = {2016},
date = {2016-04-01},
journal = {Acta Biomaterialia},
volume = {35},
pages = {293--304},
publisher = {Elsevier},
abstract = {In this paper, the synthesis of alloyed CuInZnxS2+x quantum dots (ZCIS QDs), their transfer into aqueous solution via a polymer coating technique, and the use of these nanocrystals to selectively target HER2-positive cells, are reported. By optimizing first the ZnS shell deposition process onto the CuInS2 core, and next the encapsulation of the dots with the amphiphilic poly(maleic anhydride-alt-1-octadecene) (PMAO) polymer, water-dispersible ZCIS QDs were successfully prepared. The nanocrystals with a photoluminescence quantum yield of 35% were purified via centrifugation and ultracentrifugation and high quality nanoparticles with narrow size distributions and surface charges were obtained. After verifying the biocompatibility of PMO-coated ZCIS QDs, we coupled these nanocrystals with the LTVSPWY peptide and demonstrated via MTT assay that both bare and the peptide-linked QDs exhibit low cytotoxicity. The HER2-mediated delivery of the peptide-linked QDs was confirmed by confocal microscopy. This study indicates that as engineered QDs can efficiently be used as fluorescent nanoprobes for selective labelling of HER2-positive SKBR3 cancer cells.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Jarzębski, Maciej; Zhang, Yingze; Śliwa, Tomasz; Mazuryk, Jarosław; Deptuła, Tobiasz; Kucinska, Malgorzata; Murias, Marek; Buitenhuis, Johan; Gapiński, Jacek; Patkowski, Adam
In: Journal of Fluorine Chemistry, vol. 183, pp. 92–99, 2016, ISSN: 00221139.
Abstract | Links | BibTeX | Tagi:
@article{Jarzebski2016,
title = {Core–shell fluorinated methacrylate nanoparticles with Rhodamine-B for confocal microscopy and fluorescence correlation spectroscopy applications},
author = {Maciej Jarzębski and Yingze Zhang and Tomasz Śliwa and Jarosław Mazuryk and Tobiasz Deptuła and Malgorzata Kucinska and Marek Murias and Johan Buitenhuis and Jacek Gapiński and Adam Patkowski},
url = {https://www.sciencedirect.com/science/article/pii/S0022113916300148 http://linkinghub.elsevier.com/retrieve/pii/S0022113916300148},
doi = {10.1016/j.jfluchem.2016.01.014},
issn = {00221139},
year = {2016},
date = {2016-03-01},
journal = {Journal of Fluorine Chemistry},
volume = {183},
pages = {92--99},
publisher = {Elsevier},
abstract = {There is a need to develop nanosized and submicron sized stable and efficient fluorescent particles for confocal microscopy and fluorescence correlation spectroscopy, which are useful methods to study dynamics and interactions in complex colloidal systems and living cells. Fluorescent core–transparent shell fluorinated polymer nanoparticles exhibit low refractive index, close to that of water, high fluorescence efficiency, high stability and no cytotoxicity which makes them excellent probes for water based and living systems. Fluorescent core–transparent shell submicron particles were synthesized using 1H,1H-heptafluoro-n-butyl methacrylate (HFBMA) as a monomer and Rhodamine-B-isothiocyanate as a dye. The fluorescent polymeric core was surrounded by a non-fluorescent shell obtained by the seeded growth synthesis. The spherical shape of the particles was confirmed by scanning electron microscopy and the particle size in suspension was characterized by dynamic light scattering (DLS) and fluorescence correlation spectroscopy (FCS). The effect of different reaction parameters, such as initiator concentration and polymerization time on the particle size and charge density as well as their toxicity were studied. The smallest nanoparticles, of diameter d=240nm for the core measured by DLS, were obtained with higher initiator concentration. Repeated confocal imaging, DLS and FCS measurements after a few months up to two years confirmed high fluorescence efficiency, stability and usefulness of prepared particles as versatile systems for confocal microscopy and fluorescence correlation spectroscopy studies in water-based colloidal suspensions. The cytotoxicity tests confirmed a possible use of these nanoparticles also in living cells.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Gapiński, Jacek; Jarzębski, Maciej; Buitenhuis, Johan; Deptuła, Tobiasz; Mazuryk, Jarosław; Patkowski, Adam
Structure and Dimensions of Core–Shell Nanoparticles Comparable to the Confocal Volume Studied by Means of Fluorescence Correlation Spectroscopy Journal Article
In: Langmuir, vol. 32, no. 10, pp. 2482–2491, 2016, ISSN: 0743-7463.
Abstract | Links | BibTeX | Tagi:
@article{Gapinski2016,
title = {Structure and Dimensions of Core–Shell Nanoparticles Comparable to the Confocal Volume Studied by Means of Fluorescence Correlation Spectroscopy},
author = {Jacek Gapiński and Maciej Jarzębski and Johan Buitenhuis and Tobiasz Deptuła and Jarosław Mazuryk and Adam Patkowski},
url = {http://pubs.acs.org/doi/10.1021/acs.langmuir.5b04605},
doi = {10.1021/acs.langmuir.5b04605},
issn = {0743-7463},
year = {2016},
date = {2016-03-01},
journal = {Langmuir},
volume = {32},
number = {10},
pages = {2482--2491},
publisher = {American Chemical Society},
abstract = {In some applications the dye distribution within fluorescently labeled nanoparticles and its stability over long periods of time are important issues. In this article we study numerically and experimentally the applicability of fluorescence correlation spectroscopy (FCS) to resolve such questions. When the size of fluorescently labeled particles is comparable to or larger than the confocal volume, the effective confocal volume seen in FCS experiments is increasing. Such an effect has already been studied for uniformly labeled spherical particles. In this work we analyze the form of the FCS correlation functions (CFs) for core-labeled and shell-labeled core–shell particles. For shell-labeled particles an additional fast decay was found both in simulations and in experiments on custom-made surface-labeled particles. Universal scaling of FCS correlation times based on the squared ratio of the labeled part radius of gyration to the Gaussian radius of the beam profile was found. Recipes based on the analysis o...},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Woźniak, Anna; Noculak, Agnieszka; Gapiński, Jacek; Kociolek, Daria; Boś-Liedke, Agnieszka; Zalewski, Tomasz; Grześkowiak, Bartosz F; Kołodziejczak, Anna; Jurga, Stefan; Banski, Mateusz; Misiewicz, Jan; Podhorodecki, Artur
Cytotoxicity and imaging studies of $beta$-NaGdF 4 :Yb 3+ Er 3+ @PEG-Mo nanorods Journal Article
In: RSC Advances, vol. 6, no. 98, pp. 95633–95643, 2016, ISSN: 2046-2069.
Abstract | Links | BibTeX | Tagi:
@article{Wozniak,
title = {Cytotoxicity and imaging studies of $beta$-NaGdF 4 :Yb 3+ Er 3+ @PEG-Mo nanorods},
author = {Anna Woźniak and Agnieszka Noculak and Jacek Gapiński and Daria Kociolek and Agnieszka Boś-Liedke and Tomasz Zalewski and Bartosz F Grześkowiak and Anna Kołodziejczak and Stefan Jurga and Mateusz Banski and Jan Misiewicz and Artur Podhorodecki},
url = {http://pubs.rsc.org/-/content/articlepdf/2016/ra/c6ra20415e http://xlink.rsc.org/?DOI=C6RA20415E},
doi = {10.1039/C6RA20415E},
issn = {2046-2069},
year = {2016},
date = {2016-01-01},
journal = {RSC Advances},
volume = {6},
number = {98},
pages = {95633--95643},
abstract = {Multimodal imaging based on nanostructures has become a subject of interest for numerous biomedical laboratories.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2015
Wendel, Monika; Szot, Dominika; Starzak, Karolina; Tuwalska, Dorota; Gapiński, Jacek; Naskrecki, Ryszard; Prukala, Dorota; Sikorski, Marek; Wybraniec, Slawomir; Burdzinski, Gotard
Photophysical properties of betaxanthins: Vulgaxanthin I in aqueous and alcoholic solutions Journal Article
In: Journal of Luminescence, vol. 167, pp. 289–295, 2015, ISSN: 00222313.
Abstract | Links | BibTeX | Tagi:
@article{Wendel2015,
title = {Photophysical properties of betaxanthins: Vulgaxanthin I in aqueous and alcoholic solutions},
author = {Monika Wendel and Dominika Szot and Karolina Starzak and Dorota Tuwalska and Jacek Gapiński and Ryszard Naskrecki and Dorota Prukala and Marek Sikorski and Slawomir Wybraniec and Gotard Burdzinski},
url = {https://www.sciencedirect.com/science/article/pii/S0022231315003488 http://linkinghub.elsevier.com/retrieve/pii/S0022231315003488},
doi = {10.1016/j.jlumin.2015.06.030},
issn = {00222313},
year = {2015},
date = {2015-11-01},
journal = {Journal of Luminescence},
volume = {167},
pages = {289--295},
publisher = {North-Holland},
abstract = {Betaxanthins are yellow pigments present in Caryophyllales plants and some higher fungi. We characterize photophysical properties of vulgaxanthin I and extracts of Amanita muscaria L. Vulgaxanthin I photoexcitation at $łambda$exc=476nm leads to the S1 excited state with the S1→Sn absorption bands at ca. 390 and 920nm in both aqueous and alcoholic solutions. The S1 state lifetimes (2.9 and 37ps in water) imply that vulgaxanthin I exists in two stereoisomeric forms. An increase in the solvent viscosity extends the S1 lifetimes and fluorescence quantum yields, probably due to hindered internal rotations in the dye. Internal conversion is the major S1 state deactivation path, with fluorescence being a minor channel, and S1→T1 intersystem crossing not observed. Betaxanthins extracted from A. muscaria L. have similar properties. Efficient dissipation of the absorbed light energy as heat supports the postulate of photoprotective role of betaxanthins in vivo.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Kryjewski, Michal; Tykarska, Ewa; Rebis, Tomasz; Dlugaszewska, Jolanta; Ratajczak, Magdalena; Teubert, Anna; Gapiński, Jacek; Patkowski, Adam; Piskorz, Jaroslaw; Milczarek, Grzegorz; Gdaniec, Maria; Goslinski, Tomasz; Mielcarek, Jadwiga
Porphyrazine with bulky 2-(1-adamantyl)-5-phenylpyrrol-1-yl periphery tuning its spectral and electrochemical properties Journal Article
In: Polyhedron, vol. 98, pp. 217–223, 2015, ISSN: 02775387.
Abstract | Links | BibTeX | Tagi:
@article{Kryjewski2015,
title = {Porphyrazine with bulky 2-(1-adamantyl)-5-phenylpyrrol-1-yl periphery tuning its spectral and electrochemical properties},
author = {Michal Kryjewski and Ewa Tykarska and Tomasz Rebis and Jolanta Dlugaszewska and Magdalena Ratajczak and Anna Teubert and Jacek Gapiński and Adam Patkowski and Jaroslaw Piskorz and Grzegorz Milczarek and Maria Gdaniec and Tomasz Goslinski and Jadwiga Mielcarek},
url = {https://www.sciencedirect.com/science/article/pii/S0277538715002934 http://linkinghub.elsevier.com/retrieve/pii/S0277538715002934},
doi = {10.1016/j.poly.2015.05.033},
issn = {02775387},
year = {2015},
date = {2015-09-01},
journal = {Polyhedron},
volume = {98},
pages = {217--223},
publisher = {Pergamon},
abstract = {The synthesis and physicochemical properties of a novel porphyrazine possessing an alternate system of two peripheral substituents, 2-(1-adamantyl)-5-phenylpyrrol-1-yl and dimethylamino, are presented. Precursor maleonitriles were characterized using X-ray crystallography. Novel porphyrazine was subjected to spectroscopic studies, including the determination of fluorescence quantum yield and singlet oxygen quantum yield. Moreover, its electrochemical and spectroelectrochemical properties were investigated. The antimicrobial photodynamic activities of the novel porphyrazine encapsulated in various liposomal formulations were tested against Staphylococcus aureus and Pseudomonas aeruginosa.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Deptuła, Tobiasz; Buitenhuis, Johan; Jarzębski, Maciej; Patkowski, Adam; Gapiński, Jacek
Size of Submicrometer Particles Measured by FCS: Correction of the Confocal Volume Journal Article
In: Langmuir, vol. 31, no. 24, pp. 6681–6687, 2015, ISSN: 0743-7463.
Abstract | Links | BibTeX | Tagi:
@article{Deptua2015,
title = {Size of Submicrometer Particles Measured by FCS: Correction of the Confocal Volume},
author = {Tobiasz Deptuła and Johan Buitenhuis and Maciej Jarzębski and Adam Patkowski and Jacek Gapiński},
url = {http://pubs.acs.org/doi/10.1021/acs.langmuir.5b01225},
doi = {10.1021/acs.langmuir.5b01225},
issn = {0743-7463},
year = {2015},
date = {2015-06-01},
journal = {Langmuir},
volume = {31},
number = {24},
pages = {6681--6687},
publisher = {American Chemical Society},
abstract = {When fluorescence correlation spectroscopy (FCS) in combination with a confocal microscope is used to determine the hydrodynamic radius a of particles comparable to or larger than the linear size $sigma$ of the confocal volume of the microscope, a correction must be used that depends on the a2/$sigma$2 ratio and the distribution of the dye within the particle. Here we present the experimental validation of the theoretically predicted approximate correction necessary for appropriate measurements of the size of uniformly fluorescently labeled spheres of radius comparable to the size of the confocal volume. We also test the approximate correction formula for different ranges of the a/$sigma$ ratio and propose a simple procedure to obtain the correct nanoparticle size from such a measurement.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Pochylski, Mikołaj; Gapiński, Jacek
Simple way to analyze Brillouin spectra from turbid liquids. Journal Article
In: Optics letters, vol. 40, no. 7, pp. 1456–9, 2015, ISSN: 1539-4794.
Abstract | Links | BibTeX | Tagi:
@article{Pochylski2015,
title = {Simple way to analyze Brillouin spectra from turbid liquids.},
author = {Mikołaj Pochylski and Jacek Gapiński},
url = {http://www.ncbi.nlm.nih.gov/pubmed/25831358},
issn = {1539-4794},
year = {2015},
date = {2015-04-01},
journal = {Optics letters},
volume = {40},
number = {7},
pages = {1456--9},
abstract = {The shape of the Brillouin light-scattering spectrum recorded from turbid liquids is distinctly distorted compared to that from a transparent sample. The reason for this is the multiple scattering of light within the medium. The usual expression for the Brillouin spectrum does not apply to the multiple scattering situation. In this Letter, we consider a Brillouin spectrum from opaque samples composed of a distribution of spectra resulting from elementary scattering events, each occurring in single scattering vector conditions. We introduce a one-parameter test function to define the probability distribution of scattering events occurring at a given value of the scattering vector. The proposed procedure was tested on model liquids that consisted of suspensions of sub-micrometer spherical particles of different size and concentration, dispersed in different carrier liquids and studied as a function of temperature. Our analysis made it possible to account for the effect of multiple scattering and to recover the values of mechanical parameters describing the pure solvents.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2014
Gapiński, Jacek; Naegele, Gerhard; Patkowski, Adam
Freezing lines of colloidal Yukawa spheres. II. Local structure and characteristic lengths Journal Article
In: The Journal of Chemical Physics, vol. 141, no. 12, pp. 124505, 2014, ISSN: 0021-9606.
Abstract | Links | BibTeX | Tagi:
@article{Gapinski2014,
title = {Freezing lines of colloidal Yukawa spheres. II. Local structure and characteristic lengths},
author = {Jacek Gapiński and Gerhard Naegele and Adam Patkowski},
url = {http://aip.scitation.org/doi/10.1063/1.4895965},
doi = {10.1063/1.4895965},
issn = {0021-9606},
year = {2014},
date = {2014-09-01},
journal = {The Journal of Chemical Physics},
volume = {141},
number = {12},
pages = {124505},
publisher = {American Institute of Physics},
abstract = {Using the Rogers-Young (RY) integral equation scheme for the static pair correlation functions combined with the liquid-phase Hansen-Verlet freezing rule, we study the generic behavior of the radial distribution function and static structure factor of monodisperse charge-stabilized suspensions with Yukawa-type repulsive particle interactions at freezing. In a related article, labeled Paper I [J. Gapinski, G. Naegele, and A. Patkowski, J. Chem. Phys. 136, 024507 (2012)], this hybrid method was used to determine two-parameter freezing lines for experimentally controllable parameters, characteristic of suspensions of charged silica spheres in dimethylformamide. A universal scaling of the RY radial distribution function maximum is shown to apply to the liquid-bcc and liquid-fcc segments of the universal freezing line. A thorough analysis is made of the behavior of characteristic distances and wavenumbers, next-neighbor particle coordination numbers, osmotic compressibility factor, and the Ravache-Mountain-Stre...},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Banachowicz, Ewa; Patkowski, Adam; Meier, Gerd; Klamecka, Kamila; Gapiński, Jacek
Successful FCS Experiment in Nonstandard Conditions Journal Article
In: Langmuir, vol. 30, no. 29, pp. 8945–8955, 2014, ISSN: 0743-7463.
Abstract | Links | BibTeX | Tagi:
@article{Banachowicz2014,
title = {Successful FCS Experiment in Nonstandard Conditions},
author = {Ewa Banachowicz and Adam Patkowski and Gerd Meier and Kamila Klamecka and Jacek Gapiński},
url = {http://pubs.acs.org/doi/10.1021/la5015708},
doi = {10.1021/la5015708},
issn = {0743-7463},
year = {2014},
date = {2014-07-01},
journal = {Langmuir},
volume = {30},
number = {29},
pages = {8945--8955},
publisher = {American Chemical Society},
abstract = {Fluorescence correlation spectroscopy (FCS) is frequently used to measure the self-diffusion coefficient of fluorescently labeled probes in solutions, complex media, and living cells. In a standard experiment water immersion objectives and window thickness in the range of 0.13–0.19 mm are used. We show that successful FCS measurements can be performed using samples of different refractive index placed in cells having windows of different thickness, even much thicker than nominally allowed. Different water, oil, and silicon oil immersion as well as long working distance dry objectives, equipped with the correction collar, were tested and compared. We demonstrate that the requirements for FCS experiments are less stringent than those for high resolution confocal imaging and reliable relative FCS measurements can be performed even beyond the compensation range of the objectives. All these features open new possibilities for construction of custom-made high temperature and high pressure cells for FCS.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Śliwa, Tomasz; Jarzębski, Maciej; Gapiński, Jacek; Grzeszkowiak, M; Kleshchanok, D
Stimuli-Responsive PNIPAM Based Copolymers: Modeling and Light Scattering Investigations Journal Article
In: Acta Physica Polonica A, vol. 125, no. 5, pp. 1236–1239, 2014, ISSN: 0587-4246.
Abstract | Links | BibTeX | Tagi:
@article{Sliwa2014,
title = {Stimuli-Responsive PNIPAM Based Copolymers: Modeling and Light Scattering Investigations},
author = {Tomasz Śliwa and Maciej Jarzębski and Jacek Gapiński and M Grzeszkowiak and D Kleshchanok},
url = {http://przyrbwn.icm.edu.pl/APP/PDF/125/a125z5p31.pdf},
doi = {10.12693/APhysPolA.125.1236},
issn = {0587-4246},
year = {2014},
date = {2014-05-01},
journal = {Acta Physica Polonica A},
volume = {125},
number = {5},
pages = {1236--1239},
abstract = {Temperature dependent behavior of poly(N-isopropylacrylamide) (PNIPAM) copolymers was investigated in three buer-stabilized environments. The tests were performed in thermostabilized goniometer by dynamic and static light scattering. From the dynamic light scattering hydrodynamic radius was obtained. Based on the static light scattering data, calculations of the particle radius from the form factor model were done. Depending of the kind of copolymer, the dierent material response to temperature was observed. Also the characterization of dry particles was done by scanning electron microscope. These scanning electron microscopy micrograms showed the possibility of particles to aggregation.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2013
Aliotta, F; Gapiński, Jacek; Pochylski, Mikołaj; Ponterio, R C; Saija, F; Salvato, G; Vasi, C
High-frequency propagating density fluctuations in deeply supercooled water: Evidence of a single viscous relaxation Journal Article
In: Physical Review E, vol. 87, no. 2, pp. 022303, 2013, ISSN: 1539-3755.
Abstract | Links | BibTeX | Tagi:
@article{Aliotta2013,
title = {High-frequency propagating density fluctuations in deeply supercooled water: Evidence of a single viscous relaxation},
author = {F Aliotta and Jacek Gapiński and Mikołaj Pochylski and R C Ponterio and F Saija and G Salvato and C Vasi},
url = {http://www.ncbi.nlm.nih.gov/pubmed/23496512 https://link.aps.org/doi/10.1103/PhysRevE.87.022303},
doi = {10.1103/PhysRevE.87.022303},
issn = {1539-3755},
year = {2013},
date = {2013-02-01},
journal = {Physical Review E},
volume = {87},
number = {2},
pages = {022303},
abstract = {We performed a Brillouin scattering experiment on deeply supercooled water and compared the results with similar literature data obtained both at the same and at higher values of the exchanged wave vector. The whole set of available experimental data can be well reproduced with the use of the generalized hydrodynamic model where all the involved thermodynamic parameters are fixed to their literature values. On the contrary, the model based on the memory function approach generates the wrong estimates for measurables when the same values of the thermodynamic parameters are used. This result confirms our recent criticisms against the utilization of models originating from linear response theory [Phys. Rev. E 84, 051202 (2011)]. The inconsistency between models explains apparent discrepancies between the different conclusions on water acoustic behavior which may be found in the literature. We demonstrate that the observed behavior can be explained by assuming only a single relaxation process that is typical of any viscoelastic system. With all thermodynamics quantities fixed, the hydrodynamic description needs only two parameters to model the experimental data, namely, the relaxation time and the high-frequency limit of the sound velocity. The whole body of the experimental data can be well reproduced when the relaxation time behaves in an Arrhenian manner and the difference between the relaxed and not relaxed sound velocities is a constant. The high-frequency sound velocity is never higher than 2200 m/s. We conclude that, at least from experiments performed within the hydrodynamic regime, there is no indication for a fast sound close to the hypersonic velocity observed in ice.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2012
Gapiński, Jacek; Naegele, Gerhard; Patkowski, Adam
Freezing lines of colloidal Yukawa spheres. I. A Rogers-Young integral equation study Journal Article
In: The Journal of Chemical Physics, vol. 136, no. 2, pp. 024507, 2012, ISSN: 0021-9606.
Abstract | Links | BibTeX | Tagi:
@article{Gapinski2012,
title = {Freezing lines of colloidal Yukawa spheres. I. A Rogers-Young integral equation study},
author = {Jacek Gapiński and Gerhard Naegele and Adam Patkowski},
url = {http://www.ncbi.nlm.nih.gov/pubmed/22260603 http://aip.scitation.org/doi/10.1063/1.3675607},
doi = {10.1063/1.3675607},
issn = {0021-9606},
year = {2012},
date = {2012-01-01},
journal = {The Journal of Chemical Physics},
volume = {136},
number = {2},
pages = {024507},
abstract = {Using the Rogers-Young (RY) integral equation scheme for the static structure factor combined with the one-phase Hansen-Verlet (HV) freezing rule, we study the equilibrium structure and two-parameter freezing lines of colloidal particles with Yukawa-type pair interactions representing charge-stabilized silica spheres suspended in dimethylformamide (DMF). Results are presented for a vast range of concentrations, salinities and effective charges covering particles with masked excluded-volume interactions. The freezing lines were obtained for the low-charge and high-charge solutions of the static structure factor, for various two-parameter sets of experimentally accessible system parameters. All RY-HV based freezing lines can be mapped on a universal fluid-solid coexistence line in good agreement with computer simulation predictions. The RY-HV calculations extend the freezing lines obtained in earlier simulations to a broader parameter range. The experimentally observed fluid-bcc-fluid reentrant transition of charged silica spheres in DMF can be explained using the freezing lines obtained in this work.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2011
Aliotta, F; Gapiński, Jacek; Pochylski, Mikołaj; Ponterio, R C; Saija, F; Vasi, C
Collective acoustic modes in liquids: A comparison between the generalized-hydrodynamics and memory-function approaches Journal Article
In: Physical Review E, vol. 84, no. 5, pp. 051202, 2011, ISSN: 1539-3755.
Abstract | Links | BibTeX | Tagi:
@article{Aliotta2011,
title = {Collective acoustic modes in liquids: A comparison between the generalized-hydrodynamics and memory-function approaches},
author = {F Aliotta and Jacek Gapiński and Mikołaj Pochylski and R C Ponterio and F Saija and C Vasi},
url = {http://www.ncbi.nlm.nih.gov/pubmed/22181402 https://link.aps.org/doi/10.1103/PhysRevE.84.051202},
doi = {10.1103/PhysRevE.84.051202},
issn = {1539-3755},
year = {2011},
date = {2011-11-01},
journal = {Physical Review E},
volume = {84},
number = {5},
pages = {051202},
abstract = {The most familiar approaches used to describe the dynamical structure factor from adiabatic density fluctuations in liquids are based on generalized hydrodynamics and on the memory function, respectively. We show that, contrary to the common belief, the two approaches are not fully equivalent. In particular, models based on the memory function of a normalized damped oscillator fail in reproducing the correct experimental spectral profiles of systems close to the relaxation process. The discrepancy is due to misleading interpretation of the theoretical memory-function expressions, producing an unavoidable mixing of spectral contribution at different wave vectors when the theory is forced beyond its limits of validity.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Kalwarczyk, Tomasz; Ziȩbacz, Natalia; Bielejewska, Anna; Zaboklicka, Ewa; Koynov, Kaloian; Szymański, Jȩdrzej; Wilk, Agnieszka; Patkowski, Adam; Gapiński, Jacek; Butt, Hans-Jürgen; Hołyst, Robert
Comparative Analysis of Viscosity of Complex Liquids and Cytoplasm of Mammalian Cells at the Nanoscale Journal Article
In: Nano Letters, vol. 11, no. 5, pp. 2157–2163, 2011, ISSN: 1530-6984.
Abstract | Links | BibTeX | Tagi:
@article{Kalwarczyk2011,
title = {Comparative Analysis of Viscosity of Complex Liquids and Cytoplasm of Mammalian Cells at the Nanoscale},
author = {Tomasz Kalwarczyk and Natalia Ziȩbacz and Anna Bielejewska and Ewa Zaboklicka and Kaloian Koynov and Jȩdrzej Szymański and Agnieszka Wilk and Adam Patkowski and Jacek Gapiński and Hans-Jürgen Butt and Robert Hołyst},
url = {http://www.ncbi.nlm.nih.gov/pubmed/21513331 http://pubs.acs.org/doi/abs/10.1021/nl2008218},
doi = {10.1021/nl2008218},
issn = {1530-6984},
year = {2011},
date = {2011-05-01},
journal = {Nano Letters},
volume = {11},
number = {5},
pages = {2157--2163},
abstract = {We present a scaling formula for size-dependent viscosity coefficients for proteins, polymers, and fluorescent dyes diffusing in complex liquids. The formula was used to analyze the mobilities of probes of different sizes in HeLa and Swiss 3T3 mammalian cells. This analysis unveils in the cytoplasm two length scales: (i) the correlation length $xi$ (approximately 5 nm in HeLa and 7 nm in Swiss 3T3 cells) and (ii) the limiting length scale that marks the crossover between nano- and macroscale viscosity (approximately 86 nm in HeLa and 30 nm in Swiss 3T3 cells). During motion, probes smaller than $xi$ experienced matrix viscosity: $eta$(matrix) ≈ 2.0 mPatextperiodcentereds for HeLa and 0.88 mPatextperiodcentereds for Swiss 3T3 cells. Probes much larger than the limiting length scale experienced macroscopic viscosity, $eta$(macro) ≈ 4.4 × 10(-2) and 2.4 × 10(-2) Patextperiodcentereds for HeLa and Swiss 3T3 cells, respectively. Our results are persistent for the lengths scales from 0.14 nm to a few hundred nanometers.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2010
Gapiński, Jacek; Szymański, Jȩdrzej; Wilk, Agnieszka; Kohlbrecher, Joachim; Patkowski, Adam; Hołyst, Robert
Size and Shape of Micelles Studied by Means of SANS, PCS, and FCS Journal Article
In: Langmuir, vol. 26, no. 12, pp. 9304–9314, 2010, ISSN: 0743-7463.
Abstract | Links | BibTeX | Tagi:
@article{Gapinski2010,
title = {Size and Shape of Micelles Studied by Means of SANS, PCS, and FCS},
author = {Jacek Gapiński and Jȩdrzej Szymański and Agnieszka Wilk and Joachim Kohlbrecher and Adam Patkowski and Robert Hołyst},
url = {http://pubs.acs.org/doi/abs/10.1021/la100181d},
doi = {10.1021/la100181d},
issn = {0743-7463},
year = {2010},
date = {2010-06-01},
journal = {Langmuir},
volume = {26},
number = {12},
pages = {9304--9314},
publisher = {American Chemical Society},
abstract = {The hexaethylene glycol monododecyl ether (C12E6) micelles at concentrations up to 10% have been studied in their isotropic phase (10−48 °C) by means of small angle neutron scattering (SANS) and photon correlation spectroscopy (PCS). The SANS data obtained at low temperatures could be unequivocally interpreted as a result of scattering from a suspension of compact globular micelles with the shape of a triaxial ellipsoid or a short end-capped elliptical rod. Different models have been applied to analyze the SANS data obtained at higher temperatures: (i) elongated rod-like micelles with purely sterical interactions, (ii) compact globular micelles with a weak attractive potential, and (iii) globular micelles influenced by the critical phenomena in the whole temperature range studied. The good quality of the experimental data indicated model (i) as the best fit for our data. The diffusion coefficients obtained from the PCS measurements have been compared to the diffusion coefficients calculated for the rod-li...},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Pochylski, Mikołaj; Gapiński, Jacek
Brillouin Scattering Study of Polyethylene Glycol/Water System below Crystallization Temperature Journal Article
In: The Journal of Physical Chemistry B, vol. 114, no. 8, pp. 2644–2649, 2010, ISSN: 1520-6106.
Abstract | Links | BibTeX | Tagi:
@article{Pochylski2010a,
title = {Brillouin Scattering Study of Polyethylene Glycol/Water System below Crystallization Temperature},
author = {Mikołaj Pochylski and Jacek Gapiński},
url = {http://www.ncbi.nlm.nih.gov/pubmed/20146525 http://pubs.acs.org/doi/abs/10.1021/jp910783j},
doi = {10.1021/jp910783j},
issn = {1520-6106},
year = {2010},
date = {2010-03-01},
journal = {The Journal of Physical Chemistry B},
volume = {114},
number = {8},
pages = {2644--2649},
abstract = {We present the results of a Brillouin scattering experiment on aqueous mixtures of polyethylene glycol polymer cooled below their crystallization temperature. The shape of the registered spectrum changed considerably when the phase transition occurs. The Brillouin profile consisted of two peaks which has been interpreted as a result of the scattering of light on the local regions exhibiting different compressibility. Examination of the temperature dependence of the two Brillouin peak positions allows the identification of the specific microstructures present in the studied system. The existence of a complexlike hydration structure, stable against dilution and temperature agitation, was suggested. The nature and the behavior of the hydration complex is discussed in view of the earlier investigations in similar systems.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Pochylski, Mikołaj; Aliotta, F; Ponterio, R C; Saija, F; Gapiński, Jacek
Some Evidence of Scaling Behavior in the Relaxation Dynamics of Aqueous Polymer Solutions Journal Article
In: The Journal of Physical Chemistry B, vol. 114, no. 4, pp. 1614–1620, 2010, ISSN: 1520-6106.
Abstract | Links | BibTeX | Tagi:
@article{Pochylski2010b,
title = {Some Evidence of Scaling Behavior in the Relaxation Dynamics of Aqueous Polymer Solutions},
author = {Mikołaj Pochylski and F Aliotta and R C Ponterio and F Saija and Jacek Gapiński},
url = {http://www.ncbi.nlm.nih.gov/pubmed/20055360 http://pubs.acs.org/doi/abs/10.1021/jp9052456},
doi = {10.1021/jp9052456},
issn = {1520-6106},
year = {2010},
date = {2010-02-01},
journal = {The Journal of Physical Chemistry B},
volume = {114},
number = {4},
pages = {1614--1620},
abstract = {The structural relaxation behavior of aqueous solution of poly(ethylene glycol) and methoxy-capped poly(ethylene glycol), both of mean molecular mass 400 g/mol, is investigated by Brillouin scattering experiments. In both cases non-Debye relaxation processes have been detected, proceeding on the picosecond time scale. The average values of the detected relaxation time distributions fail to follow the simple Arrhenius behavior. The temperature evolution of the relaxation time is adequately fitted using the phenomenological Vogel-Fulcher-Tamman (VFT) model. In spite of the different temperature and concentration dependences observed for the two kinds of systems, with the exception of the highest samples concentrations, a unique scaling behavior has been found for the real and imaginary parts of the loss modulus plotted as a function of the reduced inverse temperature, T(0)/T, T(0) being the VFT arrest temperature. The presence of a unique scaling law in aqueous solutions of polymers characterized by different end groups suggests the establishment of similar hydrogen-bonded local structures. Within this scenario, water acts as a stabilizer and plays the main role bridging neighboring polymer chains. The possible physical interpretation of the obtained fit parameters is discussed, and the results are compared with other literature findings.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Gapiński, Jacek; Patkowski, Adam; Naegele, Gerhard
Generic behavior of the hydrodynamic function of charged colloidal suspensions Journal Article
In: The Journal of Chemical Physics, vol. 132, no. 5, pp. 054510, 2010, ISSN: 0021-9606.
Abstract | Links | BibTeX | Tagi:
@article{Gapinski2010a,
title = {Generic behavior of the hydrodynamic function of charged colloidal suspensions},
author = {Jacek Gapiński and Adam Patkowski and Gerhard Naegele},
url = {http://www.ncbi.nlm.nih.gov/pubmed/20136325 http://aip.scitation.org/doi/10.1063/1.3306397},
doi = {10.1063/1.3306397},
issn = {0021-9606},
year = {2010},
date = {2010-02-01},
journal = {The Journal of Chemical Physics},
volume = {132},
number = {5},
pages = {054510},
abstract = {We discuss the generic behavior of the hydrodynamic function H(q) and diffusion function D(q) characterizing the short-time diffusion in suspensions of charge-stabilized colloidal spheres, by covering the whole fluid regime. Special focus is given to the behavior of these functions at the freezing transition specified by the Hansen-Verlet freezing rule. Results are presented in dependence on scattering wavenumber q, effective particle charge, volume fraction, salt concentration, and particle size, by considering both the low-charge and high-charge branch solutions of static structure factors. The existence of two charge branches leads to the prediction of a re-entrant melting-freezing-melting transition for increasing particle concentration at very low salinity. A universal limiting contour line is derived for the principal peak height value of H(q), independent of particle charge and diameter, and concentration and salinity, which separates the fluid from the fluid-solid coexistence region. This line is only weakly dependent on the value of the structure factor peak height entering the Hansen-Verlet rule. A dynamic freezing criterion is derived in terms of the short-time cage diffusion coefficient, a quantity easily measurable in a scattering experiment. The higher-dimensional parameter scans underlying this study make use of the fast and highly efficient deltagamma-scheme in conjunction with the analytic rescaled mean spherical approximation input for the static structure factor. Our results constitute a comprehensive database useful to researchers performing dynamic scattering experiments on charge-stabilized dispersions.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2009
Holyst, Robert; Bielejewska, Anna; Szymański, Jędrzej; Wilk, Agnieszka; Patkowski, Adam; Gapiński, Jacek; żywociński, Andrzej; Kalwarczyk, Tomasz; Kalwarczyk, Ewelina; Tabaka, Marcin; Ziębacz, Natalia; Wieczorek, Stefan A
In: Physical Chemistry Chemical Physics, vol. 11, no. 40, pp. 9025, 2009, ISSN: 1463-9076.
Abstract | Links | BibTeX | Tagi:
@article{Holyst2009,
title = {Scaling form of viscosity at all length-scales in poly(ethylene glycol) solutions studied by fluorescence correlation spectroscopy and capillary electrophoresis},
author = {Robert Holyst and Anna Bielejewska and Jędrzej Szymański and Agnieszka Wilk and Adam Patkowski and Jacek Gapiński and Andrzej żywociński and Tomasz Kalwarczyk and Ewelina Kalwarczyk and Marcin Tabaka and Natalia Ziębacz and Stefan A Wieczorek},
url = {http://xlink.rsc.org/?DOI=b908386c},
doi = {10.1039/b908386c},
issn = {1463-9076},
year = {2009},
date = {2009-10-01},
journal = {Physical Chemistry Chemical Physics},
volume = {11},
number = {40},
pages = {9025},
publisher = {The Royal Society of Chemistry},
abstract = {We measured the viscosity of poly(ethylene glycol) (PEG 6000, 12 000, 20 000) in water using capillary electrophoresis and fluorescence correlation spectroscopy with nanoscopic probes of different diameters (from 1.7 to 114 nm). For a probe of diameter smaller than the radius of gyration of PEG (e.g.rhodamine B or lyzozyme) the measured nanoviscosity was orders of magnitude smaller than the macroviscosity. For sizes equal to (or larger than) the polymer radius of gyration, macroscopic value of viscosity was measured. A mathematical relation for macro and nanoviscosity was found as a function of PEG radius of gyration, Rg, correlation length in semi-dilute solution, $xi$, and probe size, R. For R textless Rg, the nanoviscosity (normalized by water viscosity) is given by exp(b(R/$xi$)a), and for R textgreater Rg, both nano and macroviscosity follow the same curve, exp(b(R/$xi$)a), where a and b are two constants close to unity. This mathematical relation was shown to equally well describe rhodamine (of size 1.7 nm) in PEG 20 000 and the macroviscosity of PEG 8 000 000, whose radius of gyration exceeds 200 nm. Additionally, for the smallest probes (rhodamine B and lysozyme) we have verified, using capillary electrophoresis and fluorescence correlation spectroscopy, that the Stokes–Einstein (SE) relation holds, providing that we use a size-dependent viscosity in the formula. The SE relation is correct even in PEG solutions of very high viscosity (three orders of magnitude larger than that of water).},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Gapiński, Jacek; Patkowski, Adam; Banchio, A J; Buitenhuis, J; Holmqvist, P; Lettinga, M P; Meier, G; Naegele, G
Structure and short-time dynamics in suspensions of charged silica spheres in the entire fluid regime Journal Article
In: The Journal of Chemical Physics, vol. 130, no. 8, pp. 084503, 2009, ISSN: 0021-9606.
Abstract | Links | BibTeX | Tagi:
@article{Gapinski2009,
title = {Structure and short-time dynamics in suspensions of charged silica spheres in the entire fluid regime},
author = {Jacek Gapiński and Adam Patkowski and A J Banchio and J Buitenhuis and P Holmqvist and M P Lettinga and G Meier and G Naegele},
url = {http://aip.scitation.org/doi/10.1063/1.3078408},
doi = {10.1063/1.3078408},
issn = {0021-9606},
year = {2009},
date = {2009-02-01},
journal = {The Journal of Chemical Physics},
volume = {130},
number = {8},
pages = {084503},
publisher = {American Institute of Physics},
abstract = {We present an experimental study of short-time diffusion properties in fluidlike suspensions of monodisperse charge-stabilized silica spheres suspended in dimethylformamide. The static structure factor S(q), the short-time diffusion function D(q), and the hydrodynamic function H(q) have been probed by combining x-ray photon correlation spectroscopy experiments with static small-angle x-ray scattering. Our experiments cover the full liquid-state part of the phase diagram, including de-ionized systems right at the liquid-solid phase boundary. We show that the dynamic data can be consistently described by the renormalized density fluctuation expansion theory of Beenakker and Mazur over a wide range of concentrations and ionic strengths. In accordance with this theory and Stokesian dynamics computer simulations, the measured short-time properties cross over monotonically, with increasing salt content, from the bounding values of salt-free suspensions to those of neutral hard spheres. Moreover, we discuss an u...},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2008
Patkowski, Adam; Gapiński, Jacek; Fluerasu, A; Holmqvist, P; Meier, G; Lettinga, M P; Naegele, G
Structure and Dynamics of Colloidal Suspensions Studied by Means of XPCS Journal Article
In: Acta Physica Polonica A, vol. 114, no. 2, pp. 339–350, 2008, ISSN: 0587-4246.
@article{Patkowski2008,
title = {Structure and Dynamics of Colloidal Suspensions Studied by Means of XPCS},
author = {Adam Patkowski and Jacek Gapiński and A Fluerasu and P Holmqvist and G Meier and M P Lettinga and G Naegele},
url = {http://przyrbwn.icm.edu.pl/APP/PDF/114/a114z204.pdf},
doi = {10.12693/APhysPolA.114.339},
issn = {0587-4246},
year = {2008},
date = {2008-08-01},
journal = {Acta Physica Polonica A},
volume = {114},
number = {2},
pages = {339--350},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Kriegs, H; Meier, G; Gapiński, Jacek; Patkowski, Adam
In: The Journal of Chemical Physics, vol. 128, no. 1, pp. 014507, 2008, ISSN: 0021-9606.
Abstract | Links | BibTeX | Tagi:
@article{Kriegs2008,
title = {The effect of intramolecular relaxations on the damping of longitudinal and transverse phonons in polysiloxanes studied by Brillouin spectroscopy},
author = {H Kriegs and G Meier and Jacek Gapiński and Adam Patkowski},
url = {http://www.ncbi.nlm.nih.gov/pubmed/18190204 http://aip.scitation.org/doi/10.1063/1.2816136},
doi = {10.1063/1.2816136},
issn = {0021-9606},
year = {2008},
date = {2008-01-01},
journal = {The Journal of Chemical Physics},
volume = {128},
number = {1},
pages = {014507},
abstract = {The effect of intramolecular relaxations on the damping of longitudinal and transverse phonons was studied in poly(methylphenylsiloxane) (PMPS) and poly(ethylmethylsiloxane) (PEMS) polymers by means of Brillouin spectroscopy. It is shown that studies of the polarized and depolarized Brillouin spectra as functions of temperature and pressure allow for the separation of the contributions of the internal and structural relaxations to the damping of longitudinal and transverse phonons, respectively. In polymers with intramolecular relaxations these processes contribute not only to the damping of longitudinal phonons, according to theoretical predictions, but also transverse phonons, in contradiction to the theory.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2007
Marcinkowska-Gapińska, Anna; Gapiński, Jacek; Elikowski, Waldemar; Jaroszyk, Feliks; Kubisz, Leszek
Comparison of three rheological models of shear flow behavior studied on blood samples from post-infarction patients Journal Article
In: Medical & Biological Engineering & Computing, vol. 45, no. 9, pp. 837–844, 2007, ISSN: 0140-0118.
Abstract | Links | BibTeX | Tagi:
@article{Marcinkowska-Gapinska2007,
title = {Comparison of three rheological models of shear flow behavior studied on blood samples from post-infarction patients},
author = {Anna Marcinkowska-Gapińska and Jacek Gapiński and Waldemar Elikowski and Feliks Jaroszyk and Leszek Kubisz},
url = {http://www.ncbi.nlm.nih.gov/pubmed/17674068 http://link.springer.com/10.1007/s11517-007-0236-4},
doi = {10.1007/s11517-007-0236-4},
issn = {0140-0118},
year = {2007},
date = {2007-09-01},
journal = {Medical & Biological Engineering & Computing},
volume = {45},
number = {9},
pages = {837--844},
abstract = {Quantitative analysis of blood viscosity was performed on the basis of mathematical models of non-Newtonian fluid shear flow behavior (Casson, Ree-Eyring and Quemada). A total of 100 blood samples were drawn from clinically stable survivors of myocardial infarction, treated with aspirin or acenocoumarol and controls to these drugs. Whole blood and plasma viscosity were measured at a broad range of shear rates using a rotary-oscillating viscometer Contraves LS40. Numerical analysis of the experimental data was carried out by means of linear (for Casson) and non-linear regression for the remaining models. In the evaluation of the results, both the fit quality and physical interpretation of the models' parameters were considered. The Quemada model fitted most precisely with the experimental findings and, despite the controversies concerning the relationship between in vivo tissue perfusion and in vitro rheological measurements, seemed to be a valuable method enhancing investigation possibilities of cardiovascular patients. Our results suggest that aspirin does not affect blood rheological properties, while acenocoumarol may slightly alter red cell deformability and rouleaux formation.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Aliotta, F; Gapiński, Jacek; Pochylski, Mikołaj; Ponterio, R C; Saija, F; Salvato, G
Excess compressibility in binary liquid mixtures Journal Article
In: The Journal of Chemical Physics, vol. 126, no. 22, pp. 224508, 2007, ISSN: 0021-9606.
Abstract | Links | BibTeX | Tagi:
@article{Aliotta2007,
title = {Excess compressibility in binary liquid mixtures},
author = {F Aliotta and Jacek Gapiński and Mikołaj Pochylski and R C Ponterio and F Saija and G Salvato},
url = {http://www.ncbi.nlm.nih.gov/pubmed/17581064 http://aip.scitation.org/doi/10.1063/1.2745292},
doi = {10.1063/1.2745292},
issn = {0021-9606},
year = {2007},
date = {2007-06-01},
journal = {The Journal of Chemical Physics},
volume = {126},
number = {22},
pages = {224508},
abstract = {Brillouin scattering experiments have been carried out on some mixtures of molecular liquids. From the measurement of the hypersonic velocities we have evaluated the adiabatic compressibility as a function of the volume fraction. We show how the quadratic form of the excess compressibility dependence on the solute volume fraction can be derived by simple statistical effects and does not imply any interaction among the components of the system other than excluded volume effects. This idea is supported by the comparison of the experimental results with a well-established prototype model, consisting of a binary mixture of hard spheres with a nonadditive interaction potential. This naive model turns out to be able to produce a very wide spectrum of structural and thermodynamic features depending on values of its parameters. An attempt has made to understand what kind of structural information can be gained through the analysis of the volume fraction dependence of the compressibility.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Gapiński, Jacek; Patkowski, Adam; Banchio, A J; Holmqvist, P; Meier, G; Lettinga, M P; Naegele, G
Collective diffusion in charge-stabilized suspensions: Concentration and salt effects Journal Article
In: The Journal of Chemical Physics, vol. 126, no. 10, pp. 104905, 2007, ISSN: 0021-9606.
Abstract | Links | BibTeX | Tagi:
@article{Gapinski2007,
title = {Collective diffusion in charge-stabilized suspensions: Concentration and salt effects},
author = {Jacek Gapiński and Adam Patkowski and A J Banchio and P Holmqvist and G Meier and M P Lettinga and G Naegele},
url = {http://www.ncbi.nlm.nih.gov/pubmed/17362085 http://aip.scitation.org/doi/10.1063/1.2538891},
doi = {10.1063/1.2538891},
issn = {0021-9606},
year = {2007},
date = {2007-03-01},
journal = {The Journal of Chemical Physics},
volume = {126},
number = {10},
pages = {104905},
abstract = {The authors present a joint experimental-theoretical study of collective diffusion properties in aqueous suspensions of charge-stabilized fluorinated latex spheres. Small-angle x-ray scattering and x-ray photon correlation spectroscopy have been used to explore the concentration and ionic-strength dependence of the static and short-time dynamic properties including the hydrodynamic function H(q), the wave-number-dependent collective diffusion coefficient D(q), and the intermediate scattering function over the entire accessible range. They show that all experimental data can be quantitatively described and explained by means of a recently developed accelerated Stokesian dynamics simulation method, in combination with a modified hydrodynamic many-body theory. In particular, the behavior of H(q) for de-ionized and dense suspensions can be attributed to the influence of many-body hydrodynamics, without any need for postulating hydrodynamic screening to be present, as it was done in earlier work. Upper and lower boundaries are provided for the peak height of the hydrodynamic function and for the short-time self-diffusion coefficient over the entire range of added salt concentrations.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Pacławski, K; Gapiński, Jacek
Static and dynamic light scattering method for analysis of gold colloidal growth in aqueous solution Journal Article
In: Archives of Metallurgy and Materials, vol. 52, no. 1, pp. 121–128, 2007.
@article{Pacawski2007,
title = {Static and dynamic light scattering method for analysis of gold colloidal growth in aqueous solution},
author = {K Pacławski and Jacek Gapiński},
url = {http://yadda.icm.edu.pl/baztech/element/bwmeta1.element.baztech-article-BSW3-0029-0017},
year = {2007},
date = {2007-01-01},
journal = {Archives of Metallurgy and Materials},
volume = {52},
number = {1},
pages = {121--128},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Patkowski, Adam; Gapiński, Jacek; Meier, G; Kriegs, H
Isotropic Brillouin spectra of liquids having an internal degree of freedom Journal Article
In: The Journal of Chemical Physics, vol. 126, no. 1, pp. 014508, 2007, ISSN: 0021-9606.
@article{Patkowski2007,
title = {Isotropic Brillouin spectra of liquids having an internal degree of freedom},
author = {Adam Patkowski and Jacek Gapiński and G Meier and H Kriegs},
url = {http://aip.scitation.org/doi/10.1063/1.2426347},
doi = {10.1063/1.2426347},
issn = {0021-9606},
year = {2007},
date = {2007-01-01},
journal = {The Journal of Chemical Physics},
volume = {126},
number = {1},
pages = {014508},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2006
Pochylski, Mikołaj; Aliotta, F; Blaszczak, Z; Gapiński, Jacek
Structuring Effects and Hydration Phenomena in Poly(Ethylene Glycol)/Water Mixtures Investigated by Brillouin Scattering Journal Article
In: The Journal of Physical Chemistry B, vol. 110, no. 41, pp. 20533–20539, 2006, ISSN: 1520-6106.
Abstract | Links | BibTeX | Tagi:
@article{Pochylski2006a,
title = {Structuring Effects and Hydration Phenomena in Poly(Ethylene Glycol)/Water Mixtures Investigated by Brillouin Scattering},
author = {Mikołaj Pochylski and F Aliotta and Z Blaszczak and Jacek Gapiński},
url = {http://www.ncbi.nlm.nih.gov/pubmed/17034240 http://pubs.acs.org/doi/abs/10.1021/jp0620973},
doi = {10.1021/jp0620973},
issn = {1520-6106},
year = {2006},
date = {2006-10-01},
journal = {The Journal of Physical Chemistry B},
volume = {110},
number = {41},
pages = {20533--20539},
abstract = {Aqueous solutions of poly(ethylene glycol) (PEG) of mean molecular mass of 600 g/mol (PEG600) are investigated by Brillouin scattering technique. At high PEG content, a relaxation phenomenon is observed, which is related to a local rearrangement of the polymer structure where the interaction, via hydrogen bonding, with the solvent molecules plays a role. The obtained values of the relaxation times match the literature data very well for a fast relaxation time revealed by dielectric relaxation measurements in very similar mixtures. The calculated concentration behaviors of the excess adiabatic compressibility turns out in good agreement with the previous findings from ultrasonic measurements at 3 MHz. The observed minimum in the adiabatic compressibility is interpreted as the result of the interaction between water and the EO units of the PEG chain, which results in a structure tighter then that typical of bulk water and of pure PEG600. Such a hypothesis is supported by the observation that volume fraction value of about 0.3 coincides with the concentration value at which full hydration of EO units takes place. The observation that at the same concentration, the polymer coils start to overlap each other further supports the idea that the adiabatic compressibility behavior is monitoring the structural evolution of the mixture. However, similar results are obtained for largely different binary mixture which suggests caution in taking this conclusion too literally. In particular, the hypothesis that the occurrence of an extreme in the excess adiabatic compressibility could be simply originated by statistical effects and that further work is required for disentangling entropic contribution from effects of hetero-association and self-aggregation of one or both the components.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Patkowski, Adam; Gapiński, Jacek; Pakula, T; Meier, G
Physical nature of complex structural relaxation in polysiloxane – PMpTS: $alpha$ and $alpha$′ relaxations Journal Article
In: Polymer, vol. 47, no. 20, pp. 7231–7240, 2006, ISSN: 00323861.
Abstract | Links | BibTeX | Tagi:
@article{Patkowski2006a,
title = {Physical nature of complex structural relaxation in polysiloxane – PMpTS: $alpha$ and $alpha$′ relaxations},
author = {Adam Patkowski and Jacek Gapiński and T Pakula and G Meier},
url = {https://www.sciencedirect.com/science/article/pii/S0032386106006860 http://linkinghub.elsevier.com/retrieve/pii/S0032386106006860},
doi = {10.1016/j.polymer.2006.05.065},
issn = {00323861},
year = {2006},
date = {2006-09-01},
journal = {Polymer},
volume = {47},
number = {20},
pages = {7231--7240},
publisher = {Elsevier},
abstract = {Structural relaxation processes in poly(methyl-para-tolyl-siloxane) (PMpTS) polymers of three molecular weights were studied using dynamic light scattering. Two relaxation processes: the usual $alpha$ and an additional slow one $alpha$′ were observed and studied as function of temperature and molecular weight. Contrary to the structural relaxation, we find that in a plot T–Tg the relaxation times for the $alpha$′ process for all molecular weights do not collapse to a single curve. For one of the samples the light scattering correlation functions were compared with the corresponding functions obtained by means of mechanical relaxation, dielectric spectroscopy and computer simulations. The simulations show that the bimodal distribution, i.e. the $alpha$ relaxation and the slow ($alpha$′) process are contained in the correlation functions of most of the probes (optical anisotropy, dipole moment, chain bond, density) in agreement with experimental observations.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Szymański, Jȩdrzej; Patkowski, Adam; Gapiński, Jacek; Wilk, Agnieszka; Hołyst, Robert
Movement of Proteins in an Environment Crowded by Surfactant Micelles: Anomalous versus Normal Diffusion Journal Article
In: The Journal of Physical Chemistry B, vol. 110, no. 14, pp. 7367–7373, 2006, ISSN: 1520-6106.
Abstract | Links | BibTeX | Tagi:
@article{Szymanski2006b,
title = {Movement of Proteins in an Environment Crowded by Surfactant Micelles: Anomalous versus Normal Diffusion},
author = {Jȩdrzej Szymański and Adam Patkowski and Jacek Gapiński and Agnieszka Wilk and Robert Hołyst},
url = {http://www.ncbi.nlm.nih.gov/pubmed/16599511 http://pubs.acs.org/doi/abs/10.1021/jp055626w},
doi = {10.1021/jp055626w},
issn = {1520-6106},
year = {2006},
date = {2006-04-01},
journal = {The Journal of Physical Chemistry B},
volume = {110},
number = {14},
pages = {7367--7373},
abstract = {Small proteins move in crowded cell compartments by anomalous diffusion. In many of them, e.g., the endoplasmic reticulum, the proteins move between lipid membranes in the aqueous lumen. Molecular crowding in vitro offers a systematic way to study anomalous and normal diffusion in a well controlled environment not accessible in vivo. We prepared a crowded environment in vitro consisting of hexaethylene glycol monododecyl ether (C(12)E(6)) nonionic surfactant and water and observed lysozyme diffusion between elongated micelles. We have fitted the data obtained in fluorescence correlation spectroscopy using an anomalous diffusion model and a two-component normal diffusion model. For a small concentration of surfactant (below 4 wt %) the data can be fitted by single-component normal diffusion. For larger concentrations the normal diffusion fit gave two components: one very slow and one fast. The amplitude of the slow component grows with C(12)E(6) concentration. The ratio of diffusion coefficients (slow to fast) is on the order of 0.1 for all concentrations of surfactant in the solution. The fast diffusion is due to free proteins while the slow one is due to the protein-micelle complexes. The protein-micelle interaction is weak since even in a highly concentrated solution (35% of C(12)E(6)) the amplitude of the slow mode is only 10%, despite the fact that the average distance between the micelles is the same as the size of the protein. The anomalous diffusion model gave the anomaly index (r(2)(t) approximately t(alpha)), alpha monotonically decreasing from alpha = 1 (at 4% surfactant) to alpha = 0.88 (at 37% surfactant). The fits for two-component normal diffusion and anomalous diffusion were of equally good quality, but the physical interpretation was only straightforward for the former.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Banchio, Adolfo J; Gapiński, Jacek; Patkowski, Adam; Haeußler, Wolfgang; Fluerasu, Andrei; Sacanna, Stefano; Holmqvist, Peter; Meier, Gerhard; Lettinga, Paul M; Naegele, Gerhard
Many-Body Hydrodynamic Interactions in Charge-Stabilized Suspensions Journal Article
In: Physical Review Letters, vol. 96, no. 13, pp. 138303, 2006, ISSN: 0031-9007.
Abstract | Links | BibTeX | Tagi:
@article{Banchio2006,
title = {Many-Body Hydrodynamic Interactions in Charge-Stabilized Suspensions},
author = {Adolfo J Banchio and Jacek Gapiński and Adam Patkowski and Wolfgang Haeußler and Andrei Fluerasu and Stefano Sacanna and Peter Holmqvist and Gerhard Meier and Paul M Lettinga and Gerhard Naegele},
url = {http://www.ncbi.nlm.nih.gov/pubmed/16712043 https://link.aps.org/doi/10.1103/PhysRevLett.96.138303},
doi = {10.1103/PhysRevLett.96.138303},
issn = {0031-9007},
year = {2006},
date = {2006-04-01},
journal = {Physical Review Letters},
volume = {96},
number = {13},
pages = {138303},
abstract = {In this joint experimental-theoretical work we study hydrodynamic interaction effects in dense suspensions of charged colloidal spheres. Using x-ray photon correlation spectroscopy we have determined the hydrodynamic function H(q), for a varying range of electrosteric repulsion. We show that H(q) can be quantitatively described by means of a novel Stokesian dynamics simulation method for charged Brownian spheres, and by a modification of a many-body theory developed originally by Beenakker and Mazur. Very importantly, we can explain the behavior of H(q) for strongly correlated particles without resorting to the controversial concept of hydrodynamic screening, as was attempted in earlier work by Riese [Phys. Rev. Lett. 85, 5460 (2000)].},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Kriegs, H; Gapiński, Jacek; Meier, G; Paluch, M; Pawlus, S; Patkowski, Adam
Pressure effects on the $alpha$ and $alpha$′ relaxations in polymethylphenylsiloxane Journal Article
In: The Journal of Chemical Physics, vol. 124, no. 10, pp. 104901, 2006, ISSN: 0021-9606.
Abstract | Links | BibTeX | Tagi:
@article{Kriegs2006,
title = {Pressure effects on the $alpha$ and $alpha$′ relaxations in polymethylphenylsiloxane},
author = {H Kriegs and Jacek Gapiński and G Meier and M Paluch and S Pawlus and Adam Patkowski},
url = {http://aip.scitation.org/doi/10.1063/1.2177242},
doi = {10.1063/1.2177242},
issn = {0021-9606},
year = {2006},
date = {2006-03-01},
journal = {The Journal of Chemical Physics},
volume = {124},
number = {10},
pages = {104901},
publisher = {American Institute of Physics},
abstract = {In some polymers, in addition to the usual structural $alpha$ relaxation, a slower $alpha$′ relaxation is observed with a non-Arrhenius temperature dependence. In order to understand better the molecular origin of this $alpha$′ relaxation in poly(methylphenylsiloxane) (PMPS) we have studied, for the first time, the pressure dependence of its relaxation time, together with the usual temperature dependence, by means of dynamic light scattering (DLS). For the same material the $alpha$ relaxation was also studied by means of DLS and dielectric spectroscopy (DS) in broad temperature and pressure ranges. We find that the temperature dependence of both $alpha$ and $alpha$′ relaxation times, at all pressures studied, can be described by a double Vogel-Fulcher-Tammann (VFT) law. The pressure dependence of the characteristic temperatures Tg (glass transition temperature) and T0 (Vogel temperature) as well as the activation volumes for both $alpha$ and $alpha$′ processes are very similar, indicating, that both relaxation processes originate from similar local mol...},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Patkowski, Adam; Gapiński, Jacek; Meier, G; Kriegs, H; Grand, Le A; Dreyfus, C
Unexpected effect of internal degrees of freedom on transverse phonons in supercooled liquids Journal Article
In: Europhysics Letters (EPL), vol. 73, no. 4, pp. 607–613, 2006, ISSN: 0295-5075.
@article{Patkowski2006b,
title = {Unexpected effect of internal degrees of freedom on transverse phonons in supercooled liquids},
author = {Adam Patkowski and Jacek Gapiński and G Meier and H Kriegs and Le A Grand and C Dreyfus},
url = {http://stacks.iop.org/0295-5075/73/i=4/a=607?key=crossref.8b86e9eb8242607bf9be17b90e358bd2},
doi = {10.1209/epl/i2005-10429-y},
issn = {0295-5075},
year = {2006},
date = {2006-02-01},
journal = {Europhysics Letters (EPL)},
volume = {73},
number = {4},
pages = {607--613},
publisher = {IOP Publishing},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Pochylski, Mikołaj; Aliotta, F; Błaszczak, Z; Gapiński, Jacek
Evidences of Nonideal Mixing in Poly(ethylene Glycol)/Organic Solvent Mixtures by Brillouin Scattering Journal Article
In: The Journal of Physical Chemistry B, vol. 110, no. 1, pp. 485–493, 2006, ISSN: 1520-6106.
Abstract | Links | BibTeX | Tagi:
@article{Pochylski2006b,
title = {Evidences of Nonideal Mixing in Poly(ethylene Glycol)/Organic Solvent Mixtures by Brillouin Scattering},
author = {Mikołaj Pochylski and F Aliotta and Z Błaszczak and Jacek Gapiński},
url = {http://www.ncbi.nlm.nih.gov/pubmed/16471559 http://pubs.acs.org/doi/abs/10.1021/jp053813o},
doi = {10.1021/jp053813o},
issn = {1520-6106},
year = {2006},
date = {2006-01-01},
journal = {The Journal of Physical Chemistry B},
volume = {110},
number = {1},
pages = {485--493},
abstract = {The concentration dependence of the hypersonic properties of solutions of poly(ethylene glycol) of mean molecular mass 600 g/mol (PEG600) in benzene and toluene has been investigated by Brillouin scattering. The two solvents are very similar in structure and chemical properties, but while benzene is nonpolar, toluene possess a modest dipole. In both solvents a high-frequency relaxation process has been observed at high concentrations which has been assigned to conformational rearrangements of the polymeric chains, triggered by reorientation of the side groups. In both cases, the concentration dependence of the adiabatic compressibility deviates significantly from linearity, indicating the existence of nonideal mixing phenomena driven by aggregation processes taking place in the systems. However, there is no temperature dependence for solutions of PEG600 in benzene; on the contrary, the results obtained for solutions of PEG600 in toluene are noticeably dependent on the temperature. The comparison of the experimental data with the results of previous experiments on similar systems allows a general picture for weakly interacting mixtures of hydrogen-bonded systems and organic solvents to be developed. In particular, in the presence of a nonpolar solvent molecule the local structure of the mixture is dominated by solute self-association processes and any resulting solute-solvent correlation is barely induced by excluded volume effects. At high enough dilution the self-aggregation of solute molecules produces a variety of new local topologies that cannot be observed in bulk solute, and as a consequence, the concentration evolution of the system is too rich to be described in terms of a linear combination of a few components over the whole concentration range. The situation seems to be simpler for the polar toluene solvent molecules, where a three-component model seems able to fit the experimental concentration dependence of the hypersonic velocity. This result is interpreted to imply that the interaction between the solvent dipoles and the active sites of the solute produces a relatively stable heterocoordination, while the relevance of self-association is partially reduced.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2005
Gapiński, Jacek; Wilk, Agnieszka; Patkowski, Adam; Haeußler, W; Banchio, A J; Pecora, R; Naegele, G
Diffusion and microstructural properties of solutions of charged nanosized proteins: Experiment versus theory Journal Article
In: The Journal of Chemical Physics, vol. 123, no. 5, pp. 054708, 2005, ISSN: 0021-9606.
Abstract | Links | BibTeX | Tagi:
@article{Gapinski2005,
title = {Diffusion and microstructural properties of solutions of charged nanosized proteins: Experiment versus theory},
author = {Jacek Gapiński and Agnieszka Wilk and Adam Patkowski and W Haeußler and A J Banchio and R Pecora and G Naegele},
url = {http://www.ncbi.nlm.nih.gov/pubmed/16108686 http://aip.scitation.org/doi/10.1063/1.1996569},
doi = {10.1063/1.1996569},
issn = {0021-9606},
year = {2005},
date = {2005-08-01},
journal = {The Journal of Chemical Physics},
volume = {123},
number = {5},
pages = {054708},
abstract = {We have reanalyzed our former static small-angle x-ray scattering and photon correlation spectroscopy results on dense solutions of charged spherical apoferritin proteins using theories recently developed for studies of colloids. The static structure factors S(q), and the small-wave-number collective diffusion coefficient D(c) determined from those experiments are interpreted now in terms of a theoretical scheme based on a Derjaguin-Landau-Verwey-Overbeek-type continuum model of charged colloidal spheres. This scheme accounts, in an approximate way, for many-body hydrodynamic interactions. Stokesian dynamics computer simulations of the hydrodynamic function have been performed for the first time for dense charge-stabilized dispersions to assess the accuracy of the theoretical scheme. We show that the continuum model allows for a consistent description of all experimental results, and that the effective particle charge is dependent upon the protein concentration relative to the added salt concentration. In addition, we discuss the consequences of small ions dynamics for the collective protein diffusion within the framework of the coupled-mode theory.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Hołyst, R; Staniszewski, K; Patkowski, Adam; Gapiński, Jacek
Hidden Minima of the Gibbs Free Energy Revealed in a Phase Separation in Polymer/Surfactant/Water Mixture Journal Article
In: The Journal of Physical Chemistry B, vol. 109, no. 18, pp. 8533–8537, 2005, ISSN: 1520-6106.
Abstract | Links | BibTeX | Tagi:
@article{Hoyst2005,
title = {Hidden Minima of the Gibbs Free Energy Revealed in a Phase Separation in Polymer/Surfactant/Water Mixture},
author = {R Hołyst and K Staniszewski and Adam Patkowski and Jacek Gapiński},
url = {http://www.ncbi.nlm.nih.gov/pubmed/16852004 http://pubs.acs.org/doi/abs/10.1021/jp050634y},
doi = {10.1021/jp050634y},
issn = {1520-6106},
year = {2005},
date = {2005-05-01},
journal = {The Journal of Physical Chemistry B},
volume = {109},
number = {18},
pages = {8533--8537},
abstract = {We observed a very unusual kinetic pathway in a separating C(12)E(6)/PEG/H(2)O ternary mixture. We let the mixture separate above the spinodal temperature (cloud point temperature) for some time and next cool it into a metastable region of a phase diagram, characterized by two minima of the Gibbs potential, one corresponding to the homogeneous mixture and one to the fully separated PEG-rich and C(12)E(6)-rich phases. Despite the fact that in the metastable region the thermodynamic equilibrium corresponds to the separated phases (global minimum of the Gibbs free energy), we observe perfect mixing of the initially separated phase. The homogeneous state, obtained in this way, does not separate, if left undisturbed. However, many cooling-heating cycles or full separation with visible meniscus above the cloud point temperature induce the phase separation in the metastable region. The metastable region can exist tens of degrees below the cloud point temperature. This effect is not observed in the binary mixture of C(12)E(6)/H(2)O.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Pochylski, Mikołaj; Aliotta, F; Błaszczak, Z; Gapiński, Jacek
Structural Relaxation Processes in Polyethylene Glycol/CCl 4 Solutions by Brillouin Scattering Journal Article
In: The Journal of Physical Chemistry B, vol. 109, no. 9, pp. 4181–4188, 2005, ISSN: 1520-6106.
Abstract | Links | BibTeX | Tagi:
@article{Pochylski2005,
title = {Structural Relaxation Processes in Polyethylene Glycol/CCl 4 Solutions by Brillouin Scattering},
author = {Mikołaj Pochylski and F Aliotta and Z Błaszczak and Jacek Gapiński},
url = {http://www.ncbi.nlm.nih.gov/pubmed/16851480 http://pubs.acs.org/doi/abs/10.1021/jp045130z},
doi = {10.1021/jp045130z},
issn = {1520-6106},
year = {2005},
date = {2005-03-01},
journal = {The Journal of Physical Chemistry B},
volume = {109},
number = {9},
pages = {4181--4188},
abstract = {We present results of a Brillouin scattering experiment on solutions of poly(ethylene glycol) of mean molecular mass 600 g/mol (PEG600) in CCl4. The relaxation process detected has been assigned to conformational rearrangements of the polymeric chains, triggered by reorientation of the side groups. The concentration dependencies of the hypersound velocity and normalized absorption are compared against the indications from several models proposed in the literature. The concentration evolution of the system is described in terms of two distinct regimes. At high polymer content, the system is dominated by the structure of the dense polymer, where polymer-polymer interactions, together with excluded volume effects, induce the existence of a preferred local arrangement resulting in a narrow distribution of the relaxation times, with the average value of the relaxation time following a simple Arrhenius temperature dependence. As the concentration decreases, the original structure of the hydrogen bonded polymer network is destroyed, and a number of different local configuration coexist, giving rise to a wider distribution of relaxation times or to a multiple relaxation. At low concentrations, the experimental data are well fitted assuming a Vogel-Fulker-Tammon behavior for the average relaxation time. In addition, the observed deviation from the ideal behavior for the refractive index and the density suggests that CCl4 does not behave as an inert solvent, and due to polarization effects, it can develop local hetero-associated structures via electrostatic interaction with the O-H end groups of the polymeric chains. The hypothesis has been successfully tested by fitting the concentration behavior of the hypersonic velocity to a recent three-component model, suitable to describe the concentration dependence of sound velocity in moderately interacting fluids. The indication of the model furnishes a very high value for the association constant of the PEG600, confirming the literature indication that, in polymeric systems capable of developing long liner aggregates via hydrogen bonding interaction, the Brillouin probe is insensitive to the true length of the polymeric chains. The Brillouin scattering experiment just sees an effective hydrogen bonded aggregate that is huge relative to the length of the single polymeric chain and becomes sensitive only to the density fluctuations of the local segmental motions.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Kahle, S; Gapiński, Jacek; Hinze, G; Patkowski, Adam; Meier, G
A comparison of relaxation processes in structurally related van der Waals glass formers: The role of internal degrees of freedom Journal Article
In: The Journal of Chemical Physics, vol. 122, no. 7, pp. 074506, 2005, ISSN: 0021-9606.
Abstract | Links | BibTeX | Tagi:
@article{Kahle2005,
title = {A comparison of relaxation processes in structurally related van der Waals glass formers: The role of internal degrees of freedom},
author = {S Kahle and Jacek Gapiński and G Hinze and Adam Patkowski and G Meier},
url = {http://www.ncbi.nlm.nih.gov/pubmed/15743253 http://aip.scitation.org/doi/10.1063/1.1846653},
doi = {10.1063/1.1846653},
issn = {0021-9606},
year = {2005},
date = {2005-02-01},
journal = {The Journal of Chemical Physics},
volume = {122},
number = {7},
pages = {074506},
abstract = {Depolarized dynamic light scattering (DLS), dielectric relaxation (DS), and deuterium NMR studies of fragile van der Waals glass forming liquids phenylphthalein-dimethylether (PDE) and cresolphthalein-dimethylether (KDE) are presented. In PDE a new dielectric loss process was found, which can be attributed to the 180 degrees flip of the phenyl rings. The previous finding that the distribution of the structural relaxation times measured for PDE and KDE by DS is substantially narrower than that measured by DLS is explained by partial decoupling of the dynamics of the dipole moment from the structural relaxation of the sample. The dynamics of PDE and KDE is compared with the previous studies of two other structurally similar liquids: 1,1'-di(4-methoxy-5-methylphenyl)cyclohexane (BMMPC) and 1,1'-bis(p-methoxyphenyl)cyclohexane (BMPC) in order to relate dynamical features with the chemical structure of the material. The evidence for the intramolecular character of the secondary relaxations observed in BMPC and PDE is presented.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Kang, Kyongok; Gapiński, Jacek; Lettinga, M P; Buitenhuis, J; Meier, G; Ratajczyk, M; Dhont, Jan K G; Patkowski, Adam
Diffusion of spheres in crowded suspensions of rods Journal Article
In: The Journal of Chemical Physics, vol. 122, no. 4, pp. 044905, 2005, ISSN: 0021-9606.
Abstract | Links | BibTeX | Tagi:
@article{Kang2005,
title = {Diffusion of spheres in crowded suspensions of rods},
author = {Kyongok Kang and Jacek Gapiński and M P Lettinga and J Buitenhuis and G Meier and M Ratajczyk and Jan K G Dhont and Adam Patkowski},
url = {http://www.ncbi.nlm.nih.gov/pubmed/15740296 http://aip.scitation.org/doi/10.1063/1.1834895},
doi = {10.1063/1.1834895},
issn = {0021-9606},
year = {2005},
date = {2005-01-01},
journal = {The Journal of Chemical Physics},
volume = {122},
number = {4},
pages = {044905},
abstract = {Translational tracer diffusion of spherical macromolecules in crowded suspensions of rodlike colloids is investigated. Experiments are done using several kinds of spherical tracers in fd-virus suspensions. A wide range of size ratios L/2a of the length L of the rods and the diameter 2a of the tracer sphere is covered by combining several experimental methods: fluorescence correlation spectroscopy for small tracer spheres, dynamic light scattering for intermediate sized spheres, and video microscopy for large spheres. Fluorescence correlation spectroscopy is shown to measure long-time diffusion only for relatively small tracer spheres. Scaling of diffusion coefficients with a/xi, predicted for static networks, is not found for our dynamical network of rods (with xi the mesh size of the network). Self-diffusion of tracer spheres in the dynamical network of freely suspended rods is thus fundamentally different as compared to cross-linked networks. A theory is developed for the rod-concentration dependence of the translational diffusion coefficient at low rod concentrations for freely suspended rods. The proposed theory is based on a variational solution of the appropriate Smoluchowski equation without hydrodynamic interactions. The theory can, in principle, be further developed to describe diffusion through dynamical networks at higher rod concentrations with the inclusion of hydrodynamic interactions. Quantitative agreement with the experiments is found for large tracer spheres, and qualitative agreement for smaller spheres. This is probably due to the increasing importance of hydrodynamic interactions as compared to direct interactions as the size of the tracer sphere decreases.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2004
Dreyfus, C; Grand, A Le; Gapiński, Jacek; Steffen, W; Patkowski, Adam
Scaling the $backslashalpha $ -relaxation time of supercooled fragile organic liquids Journal Article
In: The European Physical Journal B - Condensed Matter and Complex Systems, vol. 42, no. 3, pp. 309–319, 2004, ISSN: 1434-6028.
Abstract | Links | BibTeX | Tagi:
@article{Dreyfus2004,
title = {Scaling the $backslashalpha $ -relaxation time of supercooled fragile organic liquids},
author = {C Dreyfus and A Le Grand and Jacek Gapiński and W Steffen and Adam Patkowski},
url = {http://link.springer.com/10.1140/epjb/e2004-00386-3},
doi = {10.1140/epjb/e2004-00386-3},
issn = {1434-6028},
year = {2004},
date = {2004-12-01},
journal = {The European Physical Journal B - Condensed Matter and Complex Systems},
volume = {42},
number = {3},
pages = {309--319},
publisher = {EDP Sciences},
abstract = {It was shown recently [1] that the structural $alpha$-relaxation time $backslashtau $ of supercooled o-terphenyl depends on a single control parameter $backslashGamma $, which is the product of a function of density $E(backslashrho )$, by the inverse temperature T -1. We extend this finding to other fragile glassforming liquids using light scattering data. Available experimental results do not allow to discriminate between several analytical forms of the function $E(backslashrho )$, the scaling arising from the separation of density and temperature in $backslashGamma $. We also propose a simple form for $backslashtau (backslashGamma )$, which depends only on three material-dependent parameters, reproducing relaxation times over 12 orders of magnitude.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Wilk, Agnieszka; Gapiński, Jacek; Patkowski, Adam; Pecora, R
Self-diffusion in solutions of a 20 base pair oligonucleotide: Effects of concentration and ionic strength Journal Article
In: The Journal of Chemical Physics, vol. 121, no. 21, pp. 10794–10802, 2004, ISSN: 0021-9606.
Abstract | Links | BibTeX | Tagi:
@article{Wilk2004,
title = {Self-diffusion in solutions of a 20 base pair oligonucleotide: Effects of concentration and ionic strength},
author = {Agnieszka Wilk and Jacek Gapiński and Adam Patkowski and R Pecora},
url = {http://www.ncbi.nlm.nih.gov/pubmed/15549965 http://aip.scitation.org/doi/10.1063/1.1811599},
doi = {10.1063/1.1811599},
issn = {0021-9606},
year = {2004},
date = {2004-12-01},
journal = {The Journal of Chemical Physics},
volume = {121},
number = {21},
pages = {10794--10802},
abstract = {The long-time self-diffusion coefficients of a 20 base pair duplex oligonucleotide are measured as functions of 20-mer and added NaCl salt concentrations. The self-diffusion coefficients decrease monotonically with increasing 20-mer concentrations for the high-added salt sample and display non-monotonically decreasing 20-mer concentration dependences at lower added salt concentrations. The non-monotonic behavior is attributed to the opposing effects of the tendency to increase the interactions between 20-mers as the concentration is increased and to a decrease in the extent of the Coulomb forces as counterions from the 20-mer increasingly screen them. Attempts to account for the effect of the Coulomb forces on the self-diffusion coefficients by using effective dimensions in the hard rod theory give good agreement with experiment at the highest salt concentration studied. For the lower salt concentrations there appear to be two scaling regimes--one at low polyion concentration in which the high salt scaling of the rod dimensions by adding the Debye screening to the length and diameter of the rod is appropriate and one at high polyion concentrations where the scaling of the dimensions is the addition of 1/2 the Debye screening length. Estimates of the "overlap" concentration C*=1/L(eff) indicate that the non-monotonic decrease occurs at concentrations lower than C*. Finally, the fluorescence correlation spectroscopy self-diffusion coefficients measured here are compared with the mutual diffusion coefficients measured by dynamic light scattering.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Patkowski, Adam; Gapiński, Jacek; Meier, Gerhard
Dynamics of supercooled van der Waals liquid under pressure. A dynamic light scattering study Journal Article
In: Colloid & Polymer Science, vol. 282, no. 8, pp. 874–881, 2004, ISSN: 0303-402X.
@article{Patkowski2004,
title = {Dynamics of supercooled van der Waals liquid under pressure. A dynamic light scattering study},
author = {Adam Patkowski and Jacek Gapiński and Gerhard Meier},
url = {http://link.springer.com/10.1007/s00396-004-1102-7},
doi = {10.1007/s00396-004-1102-7},
issn = {0303-402X},
year = {2004},
date = {2004-06-01},
journal = {Colloid & Polymer Science},
volume = {282},
number = {8},
pages = {874--881},
publisher = {Springer-Verlag},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Angelini, R; Fioretto, D; Gapiński, Jacek; Monaco, G; Patkowski, Adam
Study of the Rytov dip for liquid o -terphenyl Journal Article
In: Philosophical Magazine, vol. 84, no. 13-16, pp. 1463–1469, 2004, ISSN: 1478-6435.
Abstract | Links | BibTeX | Tagi:
@article{Angelini2004,
title = {Study of the Rytov dip for liquid o -terphenyl},
author = {R Angelini and D Fioretto and Jacek Gapiński and G Monaco and Adam Patkowski},
url = {http://www.tandfonline.com/doi/abs/10.1080/14786430310001644224},
doi = {10.1080/14786430310001644224},
issn = {1478-6435},
year = {2004},
date = {2004-05-01},
journal = {Philosophical Magazine},
volume = {84},
number = {13-16},
pages = {1463--1469},
publisher = {Taylor & Francis Group},
abstract = {Light scattering spectra in the depolarized configuration are presented for the fragile glass former o-terphenyl in the temperature range between 350 and 421 K. These spectra are characterized by the presence of the Rytov dip and have been analysed in terms of the two-variable model of Andersen and Pecora. This model works well in the whole temperature range explored, that is over a range where the shear viscosity varies by almost one decade. The coupling parameter R is extracted and turns out to be almost temperature independent and very similar to that derived for other studied systems.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Petekidis, G; Gapiński, Jacek; Seymour, P; van Duijneveldt, J S; Vlassopoulos, D; Fytas, G
Dynamics of core-shell particles in concentrated suspensions Journal Article
In: Physical Review E, vol. 69, no. 4, pp. 042401, 2004, ISSN: 1539-3755.
Abstract | Links | BibTeX | Tagi:
@article{Petekidis2004,
title = {Dynamics of core-shell particles in concentrated suspensions},
author = {G Petekidis and Jacek Gapiński and P Seymour and J S van Duijneveldt and D Vlassopoulos and G Fytas},
url = {http://www.ncbi.nlm.nih.gov/pubmed/15169049 https://link.aps.org/doi/10.1103/PhysRevE.69.042401},
doi = {10.1103/PhysRevE.69.042401},
issn = {1539-3755},
year = {2004},
date = {2004-04-01},
journal = {Physical Review E},
volume = {69},
number = {4},
pages = {042401},
abstract = {The dynamics of soft colloidal particles in a concentrated suspension was studied by two color dynamic light scattering. The short-time diffusion coefficient, D(s)(q), revealed a weak slowing down around the peak of S(q) in contrast to the much stronger dependence observed in hard sphere systems, and the absence of any slowing down in ultrasoft diblock micelles. The low-q limit of the diffusion coefficient, D(s)(q=0), reflecting the cooperative nature of the dynamics was found to decrease from its dilute limit value in contrast to the weak increase observed in hard sphere systems. The behavior of D(s)(q) reflects distinct polymer-layer-induced hydrodynamic effects present in concentrated suspensions of core-shell particles.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Skibinska, Lidia; Banachowicz, Ewa; Gapiński, Jacek; Patkowski, Adam; Barciszewski, Jan
Structural similarity ofE. coli 5S rRNA in solution and within the ribosome Journal Article
In: Biopolymers, vol. 73, no. 3, pp. 316–325, 2004, ISSN: 0006-3525.
@article{Skibinska2004,
title = {Structural similarity ofE. coli 5S rRNA in solution and within the ribosome},
author = {Lidia Skibinska and Ewa Banachowicz and Jacek Gapiński and Adam Patkowski and Jan Barciszewski},
url = {http://doi.wiley.com/10.1002/bip.10598},
doi = {10.1002/bip.10598},
issn = {0006-3525},
year = {2004},
date = {2004-02-01},
journal = {Biopolymers},
volume = {73},
number = {3},
pages = {316--325},
publisher = {Wiley Subscription Services, Inc., A Wiley Company},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Dobryszycki, Piotr; Kołodziejczyk, Robert; Krowarsch, Daniel; Gapiński, Jacek; Ożyhar, Andrzej; Kochman, Marian
Unfolding and Refolding of Juvenile Hormone Binding Protein Journal Article
In: Biophysical Journal, vol. 86, no. 2, pp. 1138–1148, 2004, ISSN: 00063495.
Abstract | Links | BibTeX | Tagi:
@article{Dobryszycki2004,
title = {Unfolding and Refolding of Juvenile Hormone Binding Protein},
author = {Piotr Dobryszycki and Robert Kołodziejczyk and Daniel Krowarsch and Jacek Gapiński and Andrzej Ożyhar and Marian Kochman},
url = {http://www.ncbi.nlm.nih.gov/pubmed/14747348 http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=PMC1303906 http://linkinghub.elsevier.com/retrieve/pii/S0006349504741880},
doi = {10.1016/S0006-3495(04)74188-0},
issn = {00063495},
year = {2004},
date = {2004-02-01},
journal = {Biophysical Journal},
volume = {86},
number = {2},
pages = {1138--1148},
abstract = {Juvenile hormone (JH) regulates insect development. JH present in the hemolymph is bound to a specific glycoprotein, juvenile hormone binding protein (JHBP), which serves as a carrier to deploy the hormone to target tissues. In this report structural changes of JHBP from Galleria mellonella induced by guanidine hydrochloride have been investigated by a combination of size-exclusion chromatography, protein activity measurements, and spectroscopic methods. Molecules of JHBP change their conformation from a native state via two unstable intermediates to a denatured state. The first intermediate appears in a compact state, because it slightly changes its molecular size and preserves most of the JHBP secondary structure of the native state. Although the second intermediate also preserves a substantial part of the secondary structure, it undergoes a change into a noncompact state changing its Stokes radius from approximately 30 to 39 A. Refolding experiments showed that JHBP molecules recover their full protein structure, as judged from the CD spectrum, fluorescence experiments, and JH binding activity measurements. The free energy of unfolding in the absence of the denaturant, DeltaG(D-N), is calculated to be 4.1 kcal mol(-1).},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2003
Patkowski, Adam; Paluch, M; Gapiński, Jacek
Relationship between T0, Tg and their pressure dependence for supercooled liquids Journal Article
In: Journal of Non-Crystalline Solids, vol. 330, no. 1-3, pp. 259–263, 2003, ISSN: 00223093.
Abstract | Links | BibTeX | Tagi:
@article{Patkowski2003,
title = {Relationship between T0, Tg and their pressure dependence for supercooled liquids},
author = {Adam Patkowski and M Paluch and Jacek Gapiński},
url = {https://www.sciencedirect.com/science/article/pii/S0022309303006781 http://linkinghub.elsevier.com/retrieve/pii/S0022309303006781},
doi = {10.1016/j.jnoncrysol.2003.09.002},
issn = {00223093},
year = {2003},
date = {2003-11-01},
journal = {Journal of Non-Crystalline Solids},
volume = {330},
number = {1-3},
pages = {259--263},
publisher = {North-Holland},
abstract = {We show that simple expressions can be derived from the Vogel–Fulcher–Tammann (VFT) law relating the glass transition temperature Tg, the VFT temperature T0, their pressure derivatives, the steepness index of the ‘Angell plot' and the strength parameter D of the VFT equation, in good agreement with experimental data. In the same way one can describe the dependence of the dTg/dP on the relaxation time $tau$g chosen to define the temperature Tg. Thus, this procedure allows a consistent rescaling and comparison of pressure dependent parameters obtained from different experiments and simulations.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Dreyfus, C; Aouadi, A; Gapiński, Jacek; Matos-Lopes, M; Steffen, W; Patkowski, Adam; Pick, R M
Temperature and pressure study of Brillouin transverse modes in the organic glass-forming liquid orthoterphenyl Journal Article
In: Physical Review E, vol. 68, no. 1, pp. 011204, 2003, ISSN: 1063-651X.
@article{Dreyfus2003,
title = {Temperature and pressure study of Brillouin transverse modes in the organic glass-forming liquid orthoterphenyl},
author = {C Dreyfus and A Aouadi and Jacek Gapiński and M Matos-Lopes and W Steffen and Adam Patkowski and R M Pick},
url = {https://link.aps.org/doi/10.1103/PhysRevE.68.011204},
doi = {10.1103/PhysRevE.68.011204},
issn = {1063-651X},
year = {2003},
date = {2003-07-01},
journal = {Physical Review E},
volume = {68},
number = {1},
pages = {011204},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Paluch, M; Roland, C M; Gapiński, Jacek; Patkowski, Adam
Pressure and temperature dependence of structural relaxation in diglycidylether of bisphenol A Journal Article
In: The Journal of Chemical Physics, vol. 118, no. 7, pp. 3177–3186, 2003, ISSN: 0021-9606.
Abstract | Links | BibTeX | Tagi:
@article{Paluch2003c,
title = {Pressure and temperature dependence of structural relaxation in diglycidylether of bisphenol A},
author = {M Paluch and C M Roland and Jacek Gapiński and Adam Patkowski},
url = {http://aip.scitation.org/doi/10.1063/1.1538597},
doi = {10.1063/1.1538597},
issn = {0021-9606},
year = {2003},
date = {2003-02-01},
journal = {The Journal of Chemical Physics},
volume = {118},
number = {7},
pages = {3177--3186},
publisher = {American Institute of Physics},
abstract = {The structural ($alpha$-) relaxation in diglycidylether of bisphenol A (DGEBA) has been examined using three spectroscopic methods: dielectric spectroscopy (DS), dynamic light scattering–photon correlation spectroscopy (LS), and mechanical spectroscopy. The DS and LS measurements were carried out as a function of both temperature and pressure. Moreover, pressure-volumetemperature measurements were obtained for the DGEBA. These data allow an assessment of the relative contributions of thermal energy and free volume to structural relaxation in DGEBA. The results clearly show a substantial role for both thermal and free volume fluctuations in the dramatic slowing down of the dynamics. The combined temperature- and pressure-dependences of the dielectric and light scattering relaxation times were analyzed using the Avramov equation, implying that the fragility (normalized temperature dependence) is pressure independent over the studied range of pressures. The pressure dependence was the same as measured by the diffe...},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2002
Dobek, Andrzej; Pankowska, M; Gapiński, Jacek
Magneto-optics of Ferritin Journal Article
In: Journal of Colloid and Interface Science, vol. 253, no. 2, pp. 265–272, 2002, ISSN: 00219797.
Abstract | Links | BibTeX | Tagi:
@article{Dobek2002,
title = {Magneto-optics of Ferritin},
author = {Andrzej Dobek and M Pankowska and Jacek Gapiński},
url = {http://www.ncbi.nlm.nih.gov/pubmed/16290858 http://linkinghub.elsevier.com/retrieve/pii/S0021979702985632},
doi = {10.1006/jcis.2002.8563},
issn = {00219797},
year = {2002},
date = {2002-09-01},
journal = {Journal of Colloid and Interface Science},
volume = {253},
number = {2},
pages = {265--272},
abstract = {Measurements of Rayleigh light scattering, nonlinear light scattering in DC magnetic fields, and the Cotton-Mouton effect were carried out for 15 mM NaCl and water solutions of ferritin at room temperature. The spherical geometry of the molecule implies that it is optically isotropic. Such a macromolecule should not manifest magnetic anisotropy; however, in solution it shows induced magnetic birefringence (Cotton-Mouton effect) and changes in the intensity of the scattered light components. The analysis of the obtained results indicates the deformation of linear optical polarizability induced in the ferritin by a magnetic field as the main source of the magneto-optical phenomena observed. Light scattering and the CM effects theoretically depend on the linear magneto-optical polarizability, chi, and the nonlinear magneto-optical polarizability, eta. Using the theory describing the phenomena as well as the experimental data, the values of the anisotropy of linear magneto-optical polarizability components, chi(parallel) - chi(perpendicular) = -(1.3 +/- 0.7) x 10(-22) [cm3] (in SI units chi(parallel) - chi(perpendicular) = -(2.0 +/- 1.2) x 10(-33) [m3]), the linear optical polarizability},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Gapiński, Jacek; Paluch, Marian; Patkowski, Adam
Correlation between nonexponential relaxation and non-Arrhenius behavior under conditions of high compression Journal Article
In: Physical Review E, vol. 66, no. 1, pp. 011501, 2002, ISSN: 1063-651X.
Abstract | Links | BibTeX | Tagi:
@article{Gapinski2002,
title = {Correlation between nonexponential relaxation and non-Arrhenius behavior under conditions of high compression},
author = {Jacek Gapiński and Marian Paluch and Adam Patkowski},
url = {http://www.ncbi.nlm.nih.gov/pubmed/12241364 https://link.aps.org/doi/10.1103/PhysRevE.66.011501},
doi = {10.1103/PhysRevE.66.011501},
issn = {1063-651X},
year = {2002},
date = {2002-07-01},
journal = {Physical Review E},
volume = {66},
number = {1},
pages = {011501},
abstract = {Photon correlation spectroscopy was used to investigate the behavior of the dynamical properties of 1,1'-di(4-methoxy-5-methyl-phenyl)cyclohexane (BMMPC) at elevated pressures. The fragility of BMMPC measured by the steepness index m(T) is decreasing and the nonexponentiality parameter beta(KWW) is increasing with increasing pressure. This result strongly suggests that the phenomenological correlation between the steepness index and nonexponentionality is also preserved under high compression. The pressure dependence of the structural relaxation times is well characterized by a simple activation volume form. The activation volume continuously increases with decreasing temperature, which is probably due to the increase of cooperativity of the structural relaxation process. Moreover, we found that the glass-transition temperature exhibits a significant dependence on pressure.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Haeußler, W; Wilk, Agnieszka; Gapiński, Jacek; Patkowski, Adam
Interparticle correlations due to electrostatic interactions: A small angle x-ray and dynamic light scattering study. I. Apoferritin Journal Article
In: The Journal of Chemical Physics, vol. 117, no. 1, pp. 413–426, 2002, ISSN: 0021-9606.
Abstract | Links | BibTeX | Tagi:
@article{Haußler2002,
title = {Interparticle correlations due to electrostatic interactions: A small angle x-ray and dynamic light scattering study. I. Apoferritin},
author = {W Haeußler and Agnieszka Wilk and Jacek Gapiński and Adam Patkowski},
url = {http://aip.scitation.org/doi/10.1063/1.1481383},
doi = {10.1063/1.1481383},
issn = {0021-9606},
year = {2002},
date = {2002-07-01},
journal = {The Journal of Chemical Physics},
volume = {117},
number = {1},
pages = {413--426},
publisher = {American Institute of Physics},
abstract = {The structure and dynamics of the spherical protein Apoferritin in aqueous solution are studied over a wide range of protein concentrations and ionic strengths. At high ionic strength and low protein concentration, the intermolecular forces are screened and, therefore, the proteins behave like uncharged molecules. Under these conditions, the form factor of Apoferritin was measured by means of small angle x-ray scattering (SAXS) and the hydrodynamic radius was determined by means of dynamic light scattering (DLS). The sample was found to be highly monodisperse. By decreasing the content of salt added, interactions between the Apoferritin particles were initiated. These intermolecular forces lead to a pronounced maximum in the SAXS intensity. At the same time, a slow mode appears in the relaxation time distribution, additionally to the diffusive mode. The relative amplitudes and correlation times of the diffusive and the slow mode were investigated and compared with predictions of the coupled mode theory. B...},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2001
Benmouna, Farida; Peng, Bin; Gapiński, Jacek; Patkowski, Adam; Ruhe, Jurgen; Johannsmann, Diethelm
Dynamic light scattering from liquid crystal polymer brushes swollen in a nematic solvent Journal Article
In: Liquid Crystals, vol. 28, no. 9, pp. 1353–1360, 2001, ISSN: 0267-8292.
Abstract | Links | BibTeX | Tagi:
@article{Benmouna2001,
title = {Dynamic light scattering from liquid crystal polymer brushes swollen in a nematic solvent},
author = {Farida Benmouna and Bin Peng and Jacek Gapiński and Adam Patkowski and Jurgen Ruhe and Diethelm Johannsmann},
url = {http://www.tandfonline.com/doi/abs/10.1080/02678290110061395},
doi = {10.1080/02678290110061395},
issn = {0267-8292},
year = {2001},
date = {2001-09-01},
journal = {Liquid Crystals},
volume = {28},
number = {9},
pages = {1353--1360},
publisher = {Taylor & Francis Group},
abstract = {Surface-attached side group liquid crystal polymer monolayers ('brushes') swollen in a nematic solvent were studied by means of dynamic light scattering. In the temperature range 47.5-66°C, the swollen brush is nematic while the bulk liquid crystal is isotropic. Under these conditions the light scattering is dominated by the brush. The fluctuations in the brush are 1-2 orders of magnitude slower than the fluctuations in the bulk nematic. The autocorrelation functions are well fitted by Kohlrausch-Williams-Watts stretched exponentials of the form exp[(-t/$tau$)$beta$] with a dynamic exponent $beta$ in the range 0.6-0.8.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Paluch, Marian; Gapiński, Jacek; Patkowski, Adam; Fischer, Erhard W
Does fragility depend on pressure? A dynamic light scattering study of a fragile glass-former Journal Article
In: The Journal of Chemical Physics, vol. 114, no. 18, pp. 8048–8055, 2001, ISSN: 0021-9606.
Abstract | Links | BibTeX | Tagi:
@article{Paluch2001,
title = {Does fragility depend on pressure? A dynamic light scattering study of a fragile glass-former},
author = {Marian Paluch and Jacek Gapiński and Adam Patkowski and Erhard W Fischer},
url = {http://aip.scitation.org/doi/10.1063/1.1362293},
doi = {10.1063/1.1362293},
issn = {0021-9606},
year = {2001},
date = {2001-05-01},
journal = {The Journal of Chemical Physics},
volume = {114},
number = {18},
pages = {8048--8055},
publisher = {American Institute of Physics},
abstract = {Relaxation times of the $alpha$-process in the fragile glass-forming liquid diglycidyl ether of bisphenol-A (EPON 828) were measured in a broad pressure (1–1500 bar) and temperature (264–293 K) ranges by means of the depolarized dynamic light scattering—photon correlation spectroscopy. Based on this experimental data the fragility of the supercooled liquid was calculated in two ways: as a steepness index m of the “Angell plot” and as the DT-parameter from the Vogel–Fulcher–Tammann Law, and was studied as a function of pressure. It was found, that while the steepness index depends on pressure, the DT parameter is pressure independent. The pressure dependence of the glass transition temperature Tg in EPON 828 was found to be nonlinear. Additionally, we established a relationship between the steepness index mT, the activation volume $Delta$V#, and the coefficient ∂Tg/∂Pg. In this pressure dependent study we found that also for EPON 828 the nonexponentiality of the correlation function of the $alpha$-process correlates well wi...},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2000
Liu, Hui; Gapiński, Jacek; Skibinska, Lidia; Patkowski, Adam; Pecora, R
Effect of electrostatic interactions on the dynamics of semiflexible monodisperse DNA fragments Journal Article
In: The Journal of Chemical Physics, vol. 113, no. 14, pp. 6001–6010, 2000, ISSN: 0021-9606.
Abstract | Links | BibTeX | Tagi:
@article{Liu2000,
title = {Effect of electrostatic interactions on the dynamics of semiflexible monodisperse DNA fragments},
author = {Hui Liu and Jacek Gapiński and Lidia Skibinska and Adam Patkowski and R Pecora},
url = {http://aip.scitation.org/doi/abs/10.1063/1.1290477 http://aip.scitation.org/doi/10.1063/1.1290477},
doi = {10.1063/1.1290477},
issn = {0021-9606},
year = {2000},
date = {2000-10-01},
journal = {The Journal of Chemical Physics},
volume = {113},
number = {14},
pages = {6001--6010},
publisher = {American Institute of Physics},
abstract = {The dynamics of three monodisperse linear duplex DNA fragments—a 2311 base pair restriction fragment and 1500 and 1100 base pair polymerase chain reaction fragments—in dilute solution are studied as functions of added salt (NaCl) concentration by dynamic light scattering-photon correlation spectroscopy. Translational diffusion coefficients and intramolecular relaxation times are extracted from the measured light scattering intensity time autocorrelation functions as the added salt concentration is reduced from 100 mM to approximately 0.1 mM. The relaxation times of the first intramolecular mode increase as the added salt concentration is lowered. The dependence of the translational diffusion coefficient D on the added salt concentration is not very large, although it exhibits a maximum for all three fragments. The maximum is interpreted as the consequence of two opposing effects—the stiffening of the molecule that produces an increase of the size (decrease of D) as the added salt concentration is lowered,...},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Chesne, Alexander Du; Bojkova, Albena; Gapiński, Jacek; Seip, Detlef; Fischer, Paul
Film Formation and Redispersion of Waterborne Latex Coatings Journal Article
In: Journal of Colloid and Interface Science, vol. 224, no. 1, pp. 91–98, 2000, ISSN: 00219797.
Abstract | Links | BibTeX | Tagi:
@article{DuChesne2000,
title = {Film Formation and Redispersion of Waterborne Latex Coatings},
author = {Alexander Du Chesne and Albena Bojkova and Jacek Gapiński and Detlef Seip and Paul Fischer},
url = {http://www.ncbi.nlm.nih.gov/pubmed/10708497 http://linkinghub.elsevier.com/retrieve/pii/S0021979799966456},
doi = {10.1006/jcis.1999.6645},
issn = {00219797},
year = {2000},
date = {2000-04-01},
journal = {Journal of Colloid and Interface Science},
volume = {224},
number = {1},
pages = {91--98},
abstract = {Poly(vinyl acetate-co-ethylene) latex dispersions are prepared and their films investigated with a focus on the effect of composition upon redispersion. Films of dispersions containing sufficient amounts of poly(vinyl alcohol) (PVA) can be redispersed in water. This property is lost in the presence of surfactant, a fact which suggests a procedure to control film formation. It is demonstrated that redispersion is due to a PVA-membrane which separates the particles. Loss of redispersibility in the presence of surfactant proceeds with the breakup of the membranes and a corresponding change of film properties. Experimental data is provided by light microscopy, mechanical testing, and TEM in conjunction with a staining method new to the field. The hypothesis is developed that interaction with surfactant leads to imperfect PVA-membranes that are no longer able to prevent latex polymer interdiffusion. Fluorescence correlation spectroscopy demonstrates the formation of surfactant micelles, as well as the simultaneous adsorption and aggregation of PVA onto the micelles. It is concluded that the competing surface of the surfactant micelles traps enough PVA to cause thinning and fragmentation of the membranes surrounding the particles, which enables interdiffusion of latex polymer. This effect can be used to convert the system from one forming a redispersible coating to one forming a nonredispersible (permanent) film. Copyright 2000 Academic Press.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Banachowicz, Ewa; Gapiński, Jacek; Patkowski, Adam
Solution Structure of Biopolymers: A New Method of Constructing a Bead Model Journal Article
In: Biophysical Journal, vol. 78, no. 1, pp. 70–78, 2000, ISSN: 00063495.
Abstract | Links | BibTeX | Tagi:
@article{Banachowicz2000,
title = {Solution Structure of Biopolymers: A New Method of Constructing a Bead Model},
author = {Ewa Banachowicz and Jacek Gapiński and Adam Patkowski},
url = {http://www.ncbi.nlm.nih.gov/pubmed/10620274 http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=PMC1300618 http://linkinghub.elsevier.com/retrieve/pii/S0006349500765738},
doi = {10.1016/S0006-3495(00)76573-8},
issn = {00063495},
year = {2000},
date = {2000-01-01},
journal = {Biophysical Journal},
volume = {78},
number = {1},
pages = {70--78},
publisher = {The Biophysical Society},
abstract = {We propose a new, automated method of converting crystallographic data into a bead model used for the calculations of hydrodynamic properties of rigid macromolecules. Two types of molecules are considered: nucleic acids and small proteins. A bead model of short DNA fragments has been constructed in which each nucleotide is represented by two identical, partially overlapping spheres: one for the base and one for the sugar and phosphate group. The optimum radius sigma = 5.0 A was chosen on the basis of a comparison of the calculated translational diffusion coefficients (D(T)) and the rotational relaxation times (tau(R)) with the corresponding experimental data for B-DNA fragments of 8, 12, and 20 basepairs. This value was assumed for the calculation D(T) and tau(R) of tRNA(Phe). Better agreement with the experimental data was achieved for slightly larger sigma = 5.7 A. A similar procedure was applied to small proteins. Bead models were constructed such that each amino acid was represented by a single sphere or a pair of identical, partially overlapping spheres, depending on the amino acid's size. Experimental data of D(T) of small proteins were used to establish the optimum value of sigma = 4.5 A for amino acids. The lack of experimental data on tau(R) for proteins restricted the tests to the translational diffusion properties.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
1999
Comez, L; Fioretto, Daniele; Palmieri, L; Verdini, L; Corezzi, Silvia; Gapiński, Jacek; Patkowski, Adam; Steffen, W; Fischer, Edgar W
Dielectric and light scattering analysis of the alpha-relaxation of an epoxy system Inproceedings
In: Wlochowicz, Andrzej (Ed.): pp. 120–124, International Society for Optics and Photonics, 1999.
Abstract | Links | BibTeX | Tagi:
@inproceedings{Comez1999,
title = {Dielectric and light scattering analysis of the alpha-relaxation of an epoxy system},
author = {L Comez and Daniele Fioretto and L Palmieri and L Verdini and Silvia Corezzi and Jacek Gapiński and Adam Patkowski and W Steffen and Edgar W Fischer},
editor = {Andrzej Wlochowicz},
url = {http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=901388},
doi = {10.1117/12.373694},
year = {1999},
date = {1999-12-01},
volume = {4017},
pages = {120--124},
publisher = {International Society for Optics and Photonics},
abstract = {The dynamics of an epoxy compound has been studied by wideband dielectric spectroscopy and light scattering above the glass transition temperature, Tg. A change of diffusion mechanism in the supercooled liquids has been recognized some tens of degrees above the glass transition, where a change in the temperature behavior of the main relaxation time occurs, together with the splitting of the structural and secondary relaxations and deviation from the Stokes-Einstein-Debye diffusion law. The light scattering results can be interpreted in terms of a correlation length for the structural relaxation which increases for decreasing temperature.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Comez, L; Fioretto, D; Palmieri, L; Verdini, L; Rolla, P A; Gapiński, Jacek; Pakula, T; Patkowski, Adam; Steffen, W; Fischer, E W
Light-scattering study of a supercooled epoxy resin Journal Article
In: Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, vol. 60, no. 3, pp. 3086–96, 1999, ISSN: 1063-651X.
Abstract | Links | BibTeX | Tagi:
@article{Comez1999a,
title = {Light-scattering study of a supercooled epoxy resin},
author = {L Comez and D Fioretto and L Palmieri and L Verdini and P A Rolla and Jacek Gapiński and T Pakula and Adam Patkowski and W Steffen and E W Fischer},
url = {http://www.ncbi.nlm.nih.gov/pubmed/11970116},
issn = {1063-651X},
year = {1999},
date = {1999-09-01},
journal = {Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics},
volume = {60},
number = {3},
pages = {3086--96},
abstract = {The dynamics of the fragile glass-forming liquid diglycidyl ether of bisphenol-A was studied by depolarized Rayleigh-Brillouin light-scattering and photon correlation spectroscopy above the glass transition, in the temperature range from 261 to 473 K and in the frequency range from 1 Hz to 300 GHz. The structural (alpha-) relaxation process was revealed and no signature of the secondary relaxation previously evidenced by dielectric spectroscopy at about 0.1 GHz was observed. The characteristic time of the alpha process differs from that determined by dielectric spectroscopy of an amount, which increases with increasing temperature. The relaxation times were compared with viscosity data to test the predictions of the classic Stokes-Einstein-Debye model. The tau proportional, variant eta behavior was verified for dielectric data, while a fractional power law of viscosity tau proportional, variant eta(0.89) was obtained for light-scattering relaxation times, extending over more than seven decades in viscosity and time. This deviation of light scattering from viscosity data could be interpreted in terms of cooperative motion in the supercooled liquid with a characteristic length xi(a) proportional, variant(T-T0)(-v) where T(0)=229 K is the Vogel temperature and v is close to 2 / 3 which is consistent with the prediction of the fluctuation theory of glass transition.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Dobryszycki, P; Rymarczuk, M; Gapiński, Jacek; Kochman, M
Effect of acrylamide on aldolase structure. II. Characterization of aldolase unfolding intermediates. Journal Article
In: Biochimica et biophysica acta, vol. 1431, no. 2, pp. 351–62, 1999, ISSN: 0006-3002.
Abstract | Links | BibTeX | Tagi:
@article{Dobryszycki1999,
title = {Effect of acrylamide on aldolase structure. II. Characterization of aldolase unfolding intermediates.},
author = {P Dobryszycki and M Rymarczuk and Jacek Gapiński and M Kochman},
url = {http://www.ncbi.nlm.nih.gov/pubmed/10350611},
issn = {0006-3002},
year = {1999},
date = {1999-05-01},
journal = {Biochimica et biophysica acta},
volume = {1431},
number = {2},
pages = {351--62},
abstract = {Molecules of muscle aldolase A exposed to acrylamide change their conformation via I1, T, I2, D intermediates [1] and undergo a slow irreversible chemical modification of thiol groups. There is no direct correlation between activity loss and thiol groups modification. In the native enzyme two classes of Trp residues of 1. 8 ns and 4.9 ns fluorescence lifetime have been found. Acrylamide (0. 2-0.5 M) increases lifetime of longer-lived component, yet the transfer of aldolase molecules even from higher (1.0 M) perturbant concentration to a buffer, allows regain original Trp fluorescence lifetime. I1, detected at about 0.2 M acrylamide, represents low populated tetramers of preserved enzyme activity. T, of maximum population at about 0.7-1.0 M acrylamide, consists of meta-stable tetramers of partial enzymatic activity. These molecules are able to exchange their subunits with aldolase C in opposition to the native molecules. At transition point for I2 appearance (1.8 M acrylamide), aldolase becomes highly unstable: part of molecules dissociate into subunits which in the absence of perturbant are able to reassociate into active tetramers, the remaining part undergoes irreversible denaturation and aggregation. Some expansion of aldolase tetramers takes place prior to dissociation. D, observed above 3.0 M acrylamide, consists of irreversibly denatured enzyme molecules.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Gapiński, Jacek; Steffen, W; Patkowski, Adam; Sokolov, A P; Kisliuk, A; Buchenau, U; Russina, M; Mezei, F; Schober, H
Spectrum of fast dynamics in glass forming liquids: Does the “knee” exist? Journal Article
In: The Journal of Chemical Physics, vol. 110, no. 5, pp. 2312–2315, 1999, ISSN: 0021-9606.
Abstract | Links | BibTeX | Tagi:
@article{Gapinski1999,
title = {Spectrum of fast dynamics in glass forming liquids: Does the “knee” exist?},
author = {Jacek Gapiński and W Steffen and Adam Patkowski and A P Sokolov and A Kisliuk and U Buchenau and M Russina and F Mezei and H Schober},
url = {http://aip.scitation.org/doi/abs/10.1063/1.477966 http://aip.scitation.org/doi/10.1063/1.477966},
doi = {10.1063/1.477966},
issn = {0021-9606},
year = {1999},
date = {1999-02-01},
journal = {The Journal of Chemical Physics},
volume = {110},
number = {5},
pages = {2312--2315},
publisher = {American Institute of Physics},
abstract = {A knee-shaped feature observed earlier in light scattering spectra of Ca0.4K0.3(NO3)1.4 (CKN) below Tc is used as a strong argument in favor of mode-coupling theory of the glass transition (MCT). Our careful measurements reveal no “knee” in the spectra of two glass forming liquids, CKN and ortho-terphenyl. Instead of the knee the spectra show nontrivial broadening and an increase of the intensity with a temperature increase. Both variations are confirmed by neutron scattering measurements on CKN and are neither expected in the asymptotic MCT predictions nor in any other model.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Włodarczyk, Agnieszka; Gapiński, Jacek; Patkowski, Adam; Dobek, Andrzej
Structural polymorphism of telomeres studied by photon correlation spectroscopy. Journal Article
In: Acta Biochimica Polonica, vol. 46, no. 3, pp. 609-613, 1999, ISSN: 0001-527X.
Abstract | Links | BibTeX | Tagi:
@article{Wodarczyk1999,
title = {Structural polymorphism of telomeres studied by photon correlation spectroscopy.},
author = {Agnieszka Włodarczyk and Jacek Gapiński and Adam Patkowski and Andrzej Dobek},
url = {http://www.ncbi.nlm.nih.gov/pubmed/10698269},
issn = {0001-527X},
year = {1999},
date = {1999-01-01},
journal = {Acta Biochimica Polonica},
volume = {46},
number = {3},
pages = {609-613},
abstract = {Photon Correlation Spectroscopy (PCS) was used to study the dynamics and structure of Tetrahymena telomeric sequence d(5'-TGGGGT-3')4. Two different modes were observed, corresponding to the following structures: intermolecular (tetramolecular) G-quadruplex and intramolecular (monomeric) G-quartet. Experimental values of translational diffusion coefficients DT were obtained for each structural form. The value of DT for the monomer equals to 1.4 x 10(6) (cm2/s), while for the tetramolecular structure, to 0.8 x 10(6) (cm2/s). The relative weight concentrations of these two forms were analyzed versus the concentration of NaCl varied from 10 mM to 500 mM. The values of experimentally determined diffusion coefficients were compared with those calculated assuming the "bead model" and with the atomic coordinates from the NMR and X-ray crystallographic data. For both structures the experimental and calculated values of DT were in reasonable agreement. In the entire NaCl concentration range studied, the contribution of the relative weight concentration of the monomeric telomere form changed from 85% for 10 mM NaCl to 60% for 500 mM NaCl.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Skibinska, Lidia; Gapiński, Jacek; Liu, Hui; Patkowski, Adam; Fischer, Erhard W; Pecora, R
Effect of electrostatic interactions on the structure and dynamics of a model polyelectrolyte. II. Intermolecular correlations Journal Article
In: The Journal of Chemical Physics, vol. 110, no. 3, pp. 1794–1800, 1999, ISSN: 0021-9606.
Abstract | Links | BibTeX | Tagi:
@article{Skibinska1999,
title = {Effect of electrostatic interactions on the structure and dynamics of a model polyelectrolyte. II. Intermolecular correlations},
author = {Lidia Skibinska and Jacek Gapiński and Hui Liu and Adam Patkowski and Erhard W Fischer and R Pecora},
url = {http://aip.scitation.org/doi/abs/10.1063/1.477887 http://aip.scitation.org/doi/10.1063/1.477887},
doi = {10.1063/1.477887},
issn = {0021-9606},
year = {1999},
date = {1999-01-01},
journal = {The Journal of Chemical Physics},
volume = {110},
number = {3},
pages = {1794--1800},
publisher = {American Institute of Physics},
abstract = {The peak in the small angle x-ray scattering and the dynamic light-scattering slow mode for a 20 base-pair duplex oligonucleotide (“B-DNA”) are studied as functions of oligonucleotide and added-salt (NaCl) concentrations. Both the x-ray peak intensity and the relative intensity of the slow mode decrease as the added-salt concentration is increased. The hydrodynamic radius of the slow mode increases as the added-salt concentration is decreased. The x-ray peak gradually disappears with increasing salt while the slow mode decreases in intensity, but still has some residual intensity at the highest added-salt concentration studied. There is no abrupt change in either the peak or the slow mode with increasing salt. The existence and behavior of both the x-ray peak and the slow mode indicate local ordering in the solution due to electrostatic forces. The x-ray peak position for the oligonucleotide is correlated with the static light-scattering peak seen by other workers for dilute solutions of larger polyions. ...},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
1998
Liu, Hui; Skibinska, Lidia; Gapiński, Jacek; Patkowski, Adam; Fischer, Erhard W; Pecora, R
Effect of electrostatic interactions on the structure and dynamics of a model polyelectrolyte. I. Diffusion Journal Article
In: The Journal of Chemical Physics, vol. 109, no. 17, pp. 7556–7566, 1998, ISSN: 0021-9606.
Abstract | Links | BibTeX | Tagi:
@article{Liu1998,
title = {Effect of electrostatic interactions on the structure and dynamics of a model polyelectrolyte. I. Diffusion},
author = {Hui Liu and Lidia Skibinska and Jacek Gapiński and Adam Patkowski and Erhard W Fischer and R Pecora},
url = {http://aip.scitation.org/doi/10.1063/1.477377},
doi = {10.1063/1.477377},
issn = {0021-9606},
year = {1998},
date = {1998-11-01},
journal = {The Journal of Chemical Physics},
volume = {109},
number = {17},
pages = {7556--7566},
publisher = {American Institute of Physics},
abstract = {The dynamics of a 20 base pair oligonucleotide is studied by dynamic light scattering-photon correlation spectroscopy and depolarized Fabry–Perot interferometry. The 20 base pair oligonucleotide is a well-defined, albeit short, rigid rod molecule that serves as a model for polyelectrolyte solution dynamics. The effects of added salt on the solution rotational and translational dynamics are examined in detail as functions of the 20-mer concentration. Coupled mode theory together with counterion condensation theory gives good predictions for the effects of salt on the translational diffusion of the 20-mer at the relatively low oligonucleotide concentrations studied. Comparison of the experimental results with these theories shows that the effective charge density of the polyion in solution is approximately equal to the reciprocal of the product of the Bjerrum length and the counterion charge, $nu$eff≅1/N$łambda$B. Calculation shows that the numerical solution of the coupled mode theory matrix gives a better fit of ou...},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Paillotin, G; Leibl, W; Gapiński, Jacek; Breton, J; Dobek, Andrzej
Light Gradients in Spherical Photosynthetic Vesicles Journal Article
In: Biophysical Journal, vol. 75, no. 1, pp. 124–133, 1998, ISSN: 00063495.
Abstract | Links | BibTeX | Tagi:
@article{Paillotin1998,
title = {Light Gradients in Spherical Photosynthetic Vesicles},
author = {G Paillotin and W Leibl and Jacek Gapiński and J Breton and Andrzej Dobek},
url = {https://www.sciencedirect.com/science/article/pii/S0006349598775009 http://linkinghub.elsevier.com/retrieve/pii/S0006349598775009},
doi = {10.1016/S0006-3495(98)77500-9},
issn = {00063495},
year = {1998},
date = {1998-07-01},
journal = {Biophysical Journal},
volume = {75},
number = {1},
pages = {124--133},
publisher = {Cell Press},
abstract = {Light-gradient photovoltage measurements were performed on EDTA-treated thylakoids and on osmotically swollen thylakoids (blebs), both of spherical symmetry but of different sizes. In the case of EDTA vesicles, a negative polarity (due to the normal light gradient) was observed in the blue range of the absorption spectrum, and a positive polarity, corresponding to an inverse light gradient, was observed at $łambda$=530 and $łambda$=682nm. The sign of the photovoltage polarity measured in large blebs (swollen thylakoids) is the same as that obtained for whole chloroplasts, although differences in the amplitudes are observed. An approach based on the use of polar coordinates was adapted for a theoretical description of these membrane systems of spherical symmetry. The light intensity distribution and the photovoltage in such systems were calculated. Fits to the photovoltage amplitudes, measured as a function of light wavelength, made it possible to derive the values of the dielectric constant of the protein, ϵs=3, and the refractive index of the photosynthetic membrane for light propagating perpendicular and parallel to the membrane surface},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Dobek, Andrzej; Leibl, W; Gapiński, Jacek; Breton, J; Paillotin, G
Light gradient photovoltage in spherical photosynthetic vesicles Inproceedings
In: Gyozo, Garab (Ed.): Photosynthesis: Mechanisms and Effects. Proceeding of the XIth International Congress on Photosynthesis, pp. 309-312, Kluver Academic Publishers, Dordrecht/Boston/London, 1998.
@inproceedings{Dobek1998d,
title = {Light gradient photovoltage in spherical photosynthetic vesicles},
author = {Andrzej Dobek and W Leibl and Jacek Gapiński and J Breton and G Paillotin},
editor = {Garab Gyozo},
doi = {10.1007/978-94-011-3953-3},
year = {1998},
date = {1998-01-01},
booktitle = {Photosynthesis: Mechanisms and Effects. Proceeding of the XIth International Congress on Photosynthesis},
volume = {1},
pages = {309-312},
publisher = {Kluver Academic Publishers},
address = {Dordrecht/Boston/London},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
1997
Bieniecki, Albert; Wilk, Kazimiera A; Gapiński, Jacek
Micellar Aggregation Behavior at Low Ionic Strength of Cyclic Acetal-Type Cationic Surfactants Containing the 1,3-Dioxolane Moiety Journal Article
In: The Journal of Physical Chemistry B, vol. 101, no. 6, pp. 871–875, 1997, ISSN: 1520-6106.
Abstract | Links | BibTeX | Tagi:
@article{Bieniecki1997,
title = {Micellar Aggregation Behavior at Low Ionic Strength of Cyclic Acetal-Type Cationic Surfactants Containing the 1,3-Dioxolane Moiety},
author = {Albert Bieniecki and Kazimiera A Wilk and Jacek Gapiński},
url = {http://pubs.acs.org/doi/abs/10.1021/jp9606319},
doi = {10.1021/jp9606319},
issn = {1520-6106},
year = {1997},
date = {1997-02-01},
journal = {The Journal of Physical Chemistry B},
volume = {101},
number = {6},
pages = {871--875},
publisher = {American Chemical Society},
abstract = {Aggregation studies in water of several cationic acetal-type surfactants having varied hydrophobic chains, [(2-alkyl-1,3-dioxolan-4-yl)methyl]trimethylammonium bromides (Cn-D-TAB; where Cn = C9H19, C11H23, C13H27), have been performed by means of dynamic light scattering in the 0.015−0.32 M NaBr concentration range over the temperature limits of 25−45 °C. The aggregation parameters (translational diffusion coefficient of micelle (D0), hydrodynamic radius (Rh), ionization fraction ($alpha$), and aggregation number (n)) have been determined and discussed with respect to the parameters of the “classical” alkyltrimethylammonium bromides (Cn-TAB). Additionally, the effect of diastereoisomerism upon surfactant aggregation has been characterized for the trans- and cis-[(2-tridecyl-1,3-dioxolan-4-yl)methyl]trimethylammonium (C13-D-TAB), (2-hydroxyethyl)dimethylammonium (C13-D-HEAB), and triethylammonium (C13-D-TEAB) bromides. Accordingly, the 1,3-dioxolane ring configurations and the size of the head groups do not invo...},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Bienicki, A; Wilk, K A; Gapiński, Jacek
Microenvironment characteristics of microemulsions stabilized by cyclic acetal-type cationic surfactants Incollection
In: Trends in Colloid and Interface Science XI, pp. 311–316, Steinkopff, Darmstadt, 1997.
@incollection{Bienicki1997,
title = {Microenvironment characteristics of microemulsions stabilized by cyclic acetal-type cationic surfactants},
author = {A Bienicki and K A Wilk and Jacek Gapiński},
url = {http://www.springerlink.com/index/10.1007/BFb0111007},
doi = {10.1007/BFb0111007},
year = {1997},
date = {1997-01-01},
booktitle = {Trends in Colloid and Interface Science XI},
pages = {311--316},
publisher = {Steinkopff},
address = {Darmstadt},
keywords = {},
pubstate = {published},
tppubtype = {incollection}
}
1996
Gapiński, Jacek
Static and dynamic light scattering study of oil in water microemulsions Journal Article
In: Current Topics in Biophysics, vol. 20, no. 2, pp. 167–171, 1996.
BibTeX | Tagi:
@article{Gapinski1996,
title = {Static and dynamic light scattering study of oil in water microemulsions},
author = {Jacek Gapiński},
year = {1996},
date = {1996-01-01},
journal = {Current Topics in Biophysics},
volume = {20},
number = {2},
pages = {167--171},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
1995
Gapiński, Jacek; Paillotin, G; Leibl, Winfried; Gibasiewicz, Krzysztof; Breton, Jacques; Dobek, Andrzej
Penetration of Light in Photosynthetic Membranes of Spherical Symmetry Incollection
In: Mathis, P (Ed.): Photosynthesis: From Light to Biosphere, Vol.3, pp. 421–425, Kluwer Academic Publishers, Dordrecht/Boston/London, 1995, ISBN: 978-0-7923-3862-8.
BibTeX | Tagi:
@incollection{Gapinski1995,
title = {Penetration of Light in Photosynthetic Membranes of Spherical Symmetry},
author = {Jacek Gapiński and G Paillotin and Winfried Leibl and Krzysztof Gibasiewicz and Jacques Breton and Andrzej Dobek},
editor = {P Mathis},
isbn = {978-0-7923-3862-8},
year = {1995},
date = {1995-01-01},
booktitle = {Photosynthesis: From Light to Biosphere, Vol.3},
pages = {421--425},
publisher = {Kluwer Academic Publishers},
address = {Dordrecht/Boston/London},
keywords = {},
pubstate = {published},
tppubtype = {incollection}
}
1994
Dobek, Andrzej; Paillotin, G; Gapiński, Jacek; Breton, J; Leibl, W; Trissl, H -W
Amplitude and Polarity of the Light Gradient Photovoltage from Chloroplasts Journal Article
In: Journal of Theoretical Biology, vol. 170, no. 2, pp. 129–143, 1994, ISSN: 00225193.
Abstract | Links | BibTeX | Tagi:
@article{Dobek1994,
title = {Amplitude and Polarity of the Light Gradient Photovoltage from Chloroplasts},
author = {Andrzej Dobek and G Paillotin and Jacek Gapiński and J Breton and W Leibl and H -W Trissl},
url = {https://www.sciencedirect.com/science/article/pii/S0022519384711738 http://linkinghub.elsevier.com/retrieve/pii/S0022519384711738},
doi = {10.1006/jtbi.1994.1173},
issn = {00225193},
year = {1994},
date = {1994-09-01},
journal = {Journal of Theoretical Biology},
volume = {170},
number = {2},
pages = {129--143},
publisher = {Academic Press},
abstract = {The primary charge separation in reaction centers embedded in the photosynthetic membranes induces an electric polarization in chloroplast suspensions. Photovoltages elicited by short non-saturating flashes, were observed almost 20 years ago by Witt & Zickler (1973, FEBS Lett,37, 307-310) and Fowler & Kok (1974, Progress in Photobiology, Frankfurt: Deutsche Gesellschaft). The photovoltage was interpreted as the result of the so-called "light-gradient" effect, in which the stronger excitation of the membrane facing the light source compared to the shadowed one creates a difference of dipole density in these two membranes. Owing to the anti-parallel orientation of reaction centers in opposite thylakoid membranes, a small potential difference results. It was thought that the polarity of this potential difference could be deduced from the known position of electron carriers in the photosynthetic reaction center. However, the observed polarity was often opposite to that predicted by this model. Also, the measured photovoltage amplitudes could not be quantitatively related to experimental parameters. In the present paper, we show that the "classical" explanation of the light-gradient effect does not hold true and we give an alternative explanation that is based on light propagation and interference in pigmented multilayers. A model calculation is carried out for a pair of membranes simulating stroma lamellae of chloroplasts. It predicts a wavelength-dependent light distribution as well as the polarity of the photovoltage. For low intensities, the amplitude is found to be proportional to the intensity of the incoming light, to the optical density, and to the reciprocal of the dielectric constant of the sample. When the membranes contain no chromophores or when the absorption coefficient is low, the predicted polarity is opposite to that expected from the classical picture. The model is tested with a set of experimental photovoltage data obtained at different wavelengths.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Gapiński, Jacek; Dobek, Andrzej; Paillotin, G; Breton, J; Leibl, W; Trissl, H -W
Light Gradient in Photosynthetic Systems: Theory and Experiment Journal Article
In: Laser Physics, vol. 4, no. 1, pp. 191-198, 1994.
BibTeX | Tagi:
@article{Gapinski1994,
title = {Light Gradient in Photosynthetic Systems: Theory and Experiment},
author = {Jacek Gapiński and Andrzej Dobek and G Paillotin and J Breton and W Leibl and H -W Trissl},
year = {1994},
date = {1994-01-01},
journal = {Laser Physics},
volume = {4},
number = {1},
pages = {191-198},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
1992
Gapiński, Jacek; Fytas, G; Floudas, G
Evidence of fast diffusive process in a mixed polymeric glass Journal Article
In: The Journal of Chemical Physics, vol. 96, no. 8, pp. 6311–6313, 1992, ISSN: 0021-9606.
@article{Gapinski1992,
title = {Evidence of fast diffusive process in a mixed polymeric glass},
author = {Jacek Gapiński and G Fytas and G Floudas},
url = {http://aip.scitation.org/doi/10.1063/1.462622},
doi = {10.1063/1.462622},
issn = {0021-9606},
year = {1992},
date = {1992-04-01},
journal = {The Journal of Chemical Physics},
volume = {96},
number = {8},
pages = {6311--6313},
publisher = {American Institute of Physics},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Leibl, Winfried; Paillotin, Guy; Dobek, Andrzej; Gapiński, Jacek; Trissl, Hans-W.; Breton, Jacques
Theory on the Wavelength Dependent Polarity of the Light-gradient Photovoltage Inproceedings
In: Murata, N (Ed.): Research in Photosynthesis, Vol. 1, pp. 633–636, Kluwer Academic Publishers, 1992.
BibTeX | Tagi:
@inproceedings{Leibl1992,
title = {Theory on the Wavelength Dependent Polarity of the Light-gradient Photovoltage},
author = {Winfried Leibl and Guy Paillotin and Andrzej Dobek and Jacek Gapiński and Hans-W. Trissl and Jacques Breton},
editor = {N Murata},
year = {1992},
date = {1992-01-01},
booktitle = {Research in Photosynthesis, Vol. 1},
pages = {633--636},
publisher = {Kluwer Academic Publishers},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Florek, Andrzej; Kozlowski, Krzysztof; Wróblewski, Waldemar; Gapiński, Jacek
Computer-controlled digital correlator and its application in experimental physics Journal Article
In: Microprocessors and Microsystems, vol. 16, no. 4, pp. 171–176, 1992, ISSN: 01419331.
Abstract | Links | BibTeX | Tagi:
@article{Florek1992,
title = {Computer-controlled digital correlator and its application in experimental physics},
author = {Andrzej Florek and Krzysztof Kozlowski and Waldemar Wróblewski and Jacek Gapiński},
url = {https://www.sciencedirect.com/science/article/pii/014193319290019P http://linkinghub.elsevier.com/retrieve/pii/014193319290019P},
doi = {10.1016/0141-9331(92)90019-P},
issn = {01419331},
year = {1992},
date = {1992-01-01},
journal = {Microprocessors and Microsystems},
volume = {16},
number = {4},
pages = {171--176},
publisher = {Elsevier},
abstract = {The design, operation, supporting software and application of a microprocessor-based digital correlator is described. The device has 128 channels and can measure auto- or cross-correlation functions in the range of 100 ns to 10 s. The device operates in either the single clipping or scaling mode and is especially appropriate for applications where cost is a major consideration. Experimental results measuring correlation functions are shown.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}