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    Wyświetlanie 1-3 z 3
    Tytuł:
    The XANES K-Edge Spectra for HgMnSe and HgFeSe
    Autorzy:
    Kisiel, A.
    Oleszkiewicz, J.
    Goniakowski, J.
    Markowski, R.
    Burattini, E.
    Dalba, G.
    Rocca, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1890922.pdf
    Data publikacji:
    1991-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Dm
    Opis:
    X-ray absorption near-edge structure for Hg$\text{}_{1-x}$Mn$\text{}_{x}$Se and Hg$\text{}_{1-x}$Fe$\text{}_{x}$Se was studied with the use of synchrotron radiation. The self-consistent, semirelativistic LMTO method within the LD approximation was used to calculate electronic band structure and K-edge spectra of these semimagnetic semiconductors. The theoretical results for X-ray absorption spectra were compared with experimental data.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 3; 373-376
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-Ray Absorption Near Edge Structure Analysis of HgMnSe, HgFeSe and HgTeSe
    Autorzy:
    Burattini, E.
    Kisiel, A.
    Markowski, R.
    Dalba, G.
    Giriat, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1924330.pdf
    Data publikacji:
    1993-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Dm
    Opis:
    Experimental studies of the Se K X-ray absorption edges have been carried out in HgTe$\text{}_{0.5}$Se$\text{}_{0.5}$, Hg$\text{}_{0.8}$Mn$\text{}_{0.2}$Se and Hg$\text{}_{0.9}$Fe$\text{}_{0.1}$Se. A comparison is made for Hg$\text{}_{0.5}$Mn$\text{}_{0.5}$Se and Hg$\text{}_{0.5}$Fe$\text{}_{0.5}$Se theoretical results obtained by the self-consistent, semi-relativistic LMTO method within the LD approximation. Small differences of Se K edge XANES have been shown for HgTeSe and HgSe in contrary to evident differences for HgMnSe and HgFeSe. This behaviour of the absorption Se K edges is related to significant, hybridized contribution of the 3d and 4s Mn or Fe unoccupied states. The maximal contributions of the hybridized bands of the hypothetic zinc-blende MnSe or FeSe were estimated using the virtual crystal model. These maximal contributions are situated at about 6 eV and 17 eV in zinc-blende MnSe and at -0.8 eV and 5.5 eV in zinc-blende FeSe. For HgFeSe apart from the evidence of the strongly localized resonant donor (empty for low Fe concentrations) the complementary hybridized contribution of Fe 3d empty states also situated around the conduction band minimum should be taken into consideration.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 1; 107-114
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-Ray Absorption Near Edge Spectroscopy of Sulfur in Biomolecules: Two Examples from Glutathione and Insulin
    Autorzy:
    Cinque, G.
    Bellisola, G.
    Colombatti, M.
    Burattini, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044672.pdf
    Data publikacji:
    2006-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Dm
    87.64.Gb
    Opis:
    Although a minor constituent of cell and tissues, sulfur is an essential element to fulfil a wide range of biological processes, and it is present in the functional groups of many biomolecules that participate to redox reactions in vivo. Cysteine, one of the two S-containing aminoacids present in proteins, contains sulfur in fully reduced form and its thiol group can undergo a range of reactions under physiological conditions. X-ray absorption spectroscopy represents a unique tool to speciate the redox state of sulfur in biomolecules because of the known strong correlation between oxidation state and absorption edge energy shift (over 10 eV). Moreover, a rich X-ray absorption near edge structure is related to the chemical structures of S-containing biomolecules, as well as significant spectral changes due to biochemical action. The formation of a disulfide bond, i.e. a covalent linkage between the S atoms of two cysteine residues, or its reduction were investigated only indirectly in biomolecules. X-ray absorption spectroscopy experiments at the sulfur K-edge were performed at the soft X-ray beamline in Frascati using the wiggler source of the 0.51 GeV storage ring DAΦNE. X-ray absorption near edge structure data were collected to distinguish in situ between S-thiol and disulfide on model protein systems. Such preliminary results confirm this technique as a unique probe of sulfur chemistry in vivo. Quantitative speciation of S-metabolites can be foreseen in biological tissues with no chemical manipulations of the specimen.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 3; 335-340
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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