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Polarization Properties of Liquid-Crystal Elliptical-Core Fibers

100%
Szymańska A., Woliński T.
Acta Physica Polonica A
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2001
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vol. 99
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issue 1
201-206
EN
Polarization properties of liquid-crystal core optical fibers have been investigated. The liquid-crystal fiber is characterized by elliptical anisotropic core with low birefringence liquid crystal introduced by capillary axis. The paper presents also initial experimental results of the liquid-crystal fiber in the polarimetric configuration subjected to the influence of selected perturbations.
2
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Beam Propagation Method for Liquid Crystal-Core Optical Fiber Waveguides

100%
Szymańska A., Woliński T.
Acta Physica Polonica A
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1999
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vol. 95
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issue 5
761-766
EN
Propagation effects in liquid crystal-core optical fiber waveguides were investigated and simulated by means of beam propagation method. Spatial propagation beam distribution for anisotropic liquid crystal fibers was defined by using BPM_CAD software package (courtesy of Optiwave Corporation). The field intensity was related to the refractive index of core at the liquid crystal fiber in two different waveguide configurations: planar and radial, whereas the number of the propagating modes was calculated. Numerical results were compared with some experimental data formerly obtained.
3
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Light Scattering Studies of Hydration and Structural Transformations of Lysozyme

100%
Szymańska A., Ślósarek G.
Acta Physica Polonica A
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2012
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vol. 121
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issue 3
694-698
EN
We have applied the method of dynamic light scattering to analyse the lysozyme-ethanol interaction. For low ethanol concentration (below 4.3% (v/v)) no chemical denaturation process is observed. When the ethanol concentration grows above the triggering concentration the hydrodynamic radius of lysozyme increases, indicating the structural changes within the protein molecule. The observed structural modifications are attributed to dehydration and preliminary tertiary structure modification of the protein molecule.
4
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The SAXS and Rheological Studies of HEWL Amyloid Formation

81%
Szymańska A., Ślósarek G., Hornowski T., Kozak M.
Acta Physica Polonica A
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2008
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vol. 114
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issue 2
447-454
EN
We performed small angle X-ray scattering and rheological experiments in order to analyze the aggregation and denaturation processes of hen egg white lysozyme initiated by the presence of ethanol molecule. At low ethanol concentrations (below 60% (v/v)) we did not observe any change of the radius of gyration of lysozyme and no drastic changes in viscosity of the protein solution. With the increase in ethanol concentration up to the final concentration of 85% (v/v) the viscosity of protein solution dramatically increased. For high ethanol concentration a pseudoplastic behavior of lysozyme solution was observed, indicating a process of aggregation and reorientation of the protein molecules. Similar effects were observed in small angle X-ray scattering experiments. We assume that the analysis of the aggregation processes of the hen egg white lysozyme could contribute to our understanding of the mechanism of lysozyme amyloid formation.
5
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Magnetic Properties of Transition Metal Molybdates

61%
Konieczny P., Pełka R., Grzesiak-Nowak M., Szymańska A., Łasocha W., Wasiutyński T.
Acta Physica Polonica A
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2014
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vol. 126
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issue 1
250-251
EN
Two examples of transition metal molybdates were studied with the use of X-ray diffraction and DC magnetometry techniques. First compound, copper dimolybdate trihydrate CuMo_{2}O_{7}·3H_{2}O contains 2D layers. The second one is fibrillar cobalt trimolybdate octahydrate CoMo_{3}O_{10}·8H_{2}O. Both compounds exhibit paramagnetic behaviour at room temperature. However, in the first one copper ions form dimers linked by oxygen bridges, in which exchange interactions between two localized spin states occur. The second compound consists of isolated cobalt ions in the octahedral surroundings, resulting in magnetic properties deviating from the Curie law.
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