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    Wyświetlanie 1-4 z 4
    Tytuł:
    Controlling Structural and Functional Features of Photosynthetic Antenna
    Autorzy:
    Fiedor, L.
    Fiedor, J.
    Pilch, M.
    Susz, A.
    Tworzydło, J.
    Michalik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419488.pdf
    Data publikacji:
    2012-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.15.nr
    87.15.Cc
    87.64.ks
    Opis:
    In order to gain control over the assembly and functioning of photosynthetic antenna, we have developed methods to manipulate pigment composition of bacterial LH1 complexes via their reconstitution with modified bacteriochlorophylls or carotenoids, major photoactive cofactors of these antennae. In the present work we show how the reconstitution and pigment exchange approach is applied to control structural and functional parameters of LH1 and its subunits. The size of the subunits and the energy of the first excited singlet state can be controlled via the use of detergent while the thermodynamics of LH1 formation can be modified using carotenoids and/or a co-solvent. Carotenoids affect the efficiency of the intracomplex energy transfer, while the replacement of native bacteriochlorophyll a with its Ni-substituted analog allows one to control the excited state properties of LH1. These results show that LH1 is a very promising model system applicable for the design of bio-inspired device performing solar energy conversion.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 2; 255-258
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Differentiation of Native and Reconstructed Ferritin using the MRI Gradient Echo Pulse Sequence
    Autorzy:
    Balejcikova, L.
    Strbak, O.
    Baciak, L.
    Kovac, J.
    Masarova, M.
    Krafcik, A.
    Kopcansky, P.
    Dobrota, D.
    Frollo, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032829.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.60.Ej
    83.85.Fg
    87.61.-c
    87.64.Cc
    87.85.jf
    Opis:
    Ferritin is a biological iron storage biomacromolecule, consisting of a spherical protein shell (apoferritin) and mineral iron core. It plays a crucial role in the pathological processes of disrupted iron homeostasis followed by iron accumulation, linked with various disorders (e.g. neuroinflammation, neurodegeneration, cirrhosis, cancer, etc.) In vitro reconstructed ferritin, with the assistance of a non-invasive magnetic resonance imaging technique, has the potential to become a suitable biomarker of these pathological processes. Through gradient echo pulse sequencing, we were able to clearly distinguish between native (physiological) and reconstructed/iron-overloaded (pathological) ferritin, which can serve as a starting point for the development of a method for their differentiation. Such method is necessary for the early diagnosis of iron-based diseases.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1093-1095
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement of Small Variations in Optical Properties of Turbid Inclusions with Respect to Surrounding Turbid Medium
    Autorzy:
    Bliznakova, I.
    Vankov, O.
    Dreischuh, T.
    Avramov, L.
    Stoyanov, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795702.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.15.N-
    87.64.-t
    87.64.Cc
    87.80.-y
    87.80.Ek
    Opis:
    Special optical system for non-invasive determination of small variations in the optical properties of homogeneous turbid inclusions embedded into large turbid medium is proposed and developed experimentally. Results for different choice of the optical parameters of both media are presented. The minimum detectable changes in the inclusion optical properties are estimated to be less than 5% with respect to the surrounding medium. It is shown that the output signals depend not only on the relative magnitude but also on the sign of the difference in optical properties of both media. The results could be used for developing techniques and algorithms for distinguishing of different kinds of abnormal formations.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 681-683
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photon Force-Induced Phase Transition Dynamics of Single Hydrogel Nanoparticles in Water
    Autorzy:
    Hosokawa, C.
    Matsumura, Y.
    Yoshikawa, H.
    Iwai, K.
    Masuhara, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813984.pdf
    Data publikacji:
    2007-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.80.Cc
    33.50.Dq
    61.25.Hq
    87.64.-t
    Opis:
    We investigated laser-induced phase transition dynamics of μm sized single poly(N-isopropylacrylamide) hydrogel particles in water. Single poly(N-isopropylacrylamide) gel particles labeled with a polarity-sensitive fluorescent probe monomer were optically trapped by a focused laser beam and its fluorescence dynamics was analyzed. The fluorescence intensity of trapped single gel particles was increased with the trapping laser power, while the fluorescence peak wavelength was not changed. Temperature-induced changes of fluorescence properties of the single particle were confirmed to be similar to those of the bulk solution. These behaviors are well interpreted by considering that the fluorescence intensity and fluorescence peak reflect local interactions between the fluorescent probe and attaching (bound) water molecules and effective polarity determined by (free) water content in the particle, respectively. A change in the fluorescence peak wavelength after laser trapping was followed and its blue-shift was confirmed to occur within a few hundreds seconds, indicating that a single gel particle gradually attains to a globular state on this timescale, expelling initially free water molecules and then bound ones.
    Źródło:
    Acta Physica Polonica A; 2007, 112, S; S-57-S-70
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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