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    Wyświetlanie 1-8 z 8
    Tytuł:
    Field Dependent Electron and Quadrupole Spin Relaxation: A Unified Treatment
    Autorzy:
    Kruk, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047257.pdf
    Data publikacji:
    2007-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.25.+k
    76.60.-k
    82.56.-b
    33.35.+r
    76.30.-v
    Opis:
    This article reviews recent theoretical treatments of field dependent relaxation processes in complex systems containing mutually coupled dipolar, quadrupole, and electron spins. The presented approaches are based on an analogy between the Hamiltonian formalisms for quadrupole and zero field splitting interactions. Limitations of the presented treatments, resulting from the validity conditions of the second-order perturbation theory are discussed in detail.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 2; 215-238
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Sample Rotation on the Shape of the Free Induction Decay
    Autorzy:
    Blicharska, B.
    Kruk, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929572.pdf
    Data publikacji:
    1993-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.60.-k
    Opis:
    Free induction decay is calculated at the presence of rotation of a liquid sample in a static magnetic field with a constant gradient.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 2; 321-325
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ESR Studies of Paramagnetic Centers in Pharmaceutical Materials - Cefaclor and Clarithromycin as an Example
    Autorzy:
    Skowronska, A.
    Wojciechowski, M.
    Ramos, P.
    Pilawa, B.
    Kruk, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490205.pdf
    Data publikacji:
    2012-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.15.La
    87.64.kj
    87.64.kh
    75.10.Dg
    Opis:
    Electron spin resonance (ESR) studies of two antibiotics, Cefaclor and Clarithromycin, have been performed in order to investigate concentration and dynamics of free radicals generated in these compounds due to thermal sterilization. For Cefaclor three combinations of temperature and heating time have been applied: 160°C, 170°C, 180°C for 120 min, 60 min, and 30 min, respectively, according to the pharmaceutical sterilization norm. Clarithromycin has been heated at 160°C for 120 min. The ESR lineshape has been investigated versus microwave power ranging from 2.2 mW to 70 mW. Electron spin-spin relaxation time has been estimated from the ESR lineshape analysis. Concentrations of radicals generated due to different sterilization procedures have been compared with the purpose to select the best sterilization scheme.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 2; 514-517
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    NMR Relaxation and ESR Lineshape of Anisotropically Rotating Paramagnetic Molecules
    Autorzy:
    Kubica, A.
    Milewska, A.
    Noinska, M.
    Earle, K.
    Kruk, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490224.pdf
    Data publikacji:
    2012-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.64.kj
    87.64.kh
    75.10.Dg
    76.60.Es
    Opis:
    The role of anisotropic rotation for electron spin resonance lineshape and nuclear magnetic relaxation dispersion profiles for paramagnetic molecules with electron spin quantum number S ≥ 1 is discussed. The ESR spectra and nuclear magnetic relaxation dispersion profiles are calculated by means of an approach based on the stochastic Liouville equation and referred to in the literature as "Swedish slow motion theory". This description is valid for arbitrary motional conditions and interaction strengths. Molecular tumbling influences the ESR spectra by modulating zero field splitting interactions. The nuclear spin relaxation is affected by the rotational motion in a twofold way: via the electron spin dynamics and as a direct source of modulations of the electron-nuclear dipole-dipole interactions. For coinciding principal axes systems of the permanent (residual, static) zero field splitting and rotational tensors the ESR lineshape is not affected by rotational anisotropy. Rotational anisotropy is important for nuclear relaxation as it is influenced by molecular rotation not only via the electron spin dynamics, but also directly by modulations of the electron spin-nuclear spin dipole-dipole interaction (when the dipole-dipole and zero field splitting frames do not coincide). The anisotropy effects depend strongly on the relative orientation of the dipole-dipole and permanent zero field splitting axes. Nevertheless, a different scenario is also possible. When the diffusion axis coincides with the dipole-dipole axis (but not with the principal axis system of the permanent zero field splitting), the nuclear spin relaxation as well as the ESR lineshape, become sensitive to the rotational anisotropy. The possible dependence of the ESR lineshape and nuclear spin relaxation on the rotational anisotropy should be carefully considered when attempting a joint analysis of ESR and nuclear magnetic relaxation dispersion results for paramagnetic molecules.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 2; 527-532
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polystichum setiferum at the northeastern limit of its distribution range
    Autorzy:
    Tlalka, D.
    Sliwinska, E.
    Kruk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2130571.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    distribution
    Europe
    native species
    Polska
    Polystichum setiferum
    Opis:
    During field studies in 2019 in the Beskid Śląski mountain range in southern Poland, one individual morphologically resembling Polystichum setiferum was found. Nuclear DNA content analysis confirmed the species identity. The new stand of P. setiferum corresponds to historical literature reports and herbarium specimens from the Czech Republic and Poland, and extends the northeastern limit of the distribution of this species. As the historical stands in both countries have not been confirmed, the newly discovered stand is at present strongly isolated, as the nearest extant locations of P. setiferum in Austria, southern Hungary, and western Romania are nearly 500 km away. Therefore, this unique stand deserves special attention and protection.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2021, 90
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Singlet oxygen scavenging by tocopherol and plastochromanol under photooxidative stress in Arabidopsis thaliana
    Autorzy:
    Yadav, D.
    Rastogi, A.
    Szymanska, R.
    Kruk, J.
    Sedlarova, M.
    Pospisil, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/79876.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    singlet oxygen
    tocopherol
    plastochromanol
    chloroplast
    photooxidative stress
    Arabidopsis thaliana
    electron paramagnetic resonance
    confocal laser scanning microscopy
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustical techniques of underwater meadow monitoring in the Puck Buy (Southern Baltic Sea)
    Autorzy:
    Klusek, Z.
    Gorska, N.
    Tęgowski, J.
    Groza, K.
    Faghani, D.
    Gajewski, L.
    Nowak, J.
    Kruk-Dowgiałło, L.
    Opioła, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/332109.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    acoustic techniques
    underwater meadows
    Puck Bay
    Baltic Sea
    Opis:
    The main motivation of this paper was to develop acoustical techniques to monitor underwater meadows. The data, collected with down-looking echo sounder, were used to develop method of bottom detection and tracking and measurement of vegetation canopy height in the Puck Bay. This method and its accuracy are discussed in details. The other possibilities of recognition between covered and uncovered bottom were also reviewed. The effectiveness of using side scan sonar in study vegetation spatial distribution is demonstrated.
    Źródło:
    Hydroacoustics; 2003, 6; 79-90
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of bilberry fruit on memory and the expression of parvalbumin in the rat hippocampus
    Autorzy:
    Borowiec, K.
    Matysek, M.
    Szwajgier, D.
    Biała, G.
    Kruk-Słomka, M.
    Szalak, R.
    Ziętek, J.
    Arciszewski, M.B.
    Targoński, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087496.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bilberry
    calcium-binding proteins
    hippocampus
    memory
    rat
    Źródło:
    Polish Journal of Veterinary Sciences; 2019, 3; 481-487
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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