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  • Electronic Resource  (3)
  • Loose Leaf
  • Online Resource
  • 2000-2004  (3)
  • 2001  (3)
  • PACS. 03.75.Fi Phase coherent atomic ensembles; quantum condensation phenomena – 05.30.Jp Boson systems – 32.80.Pj Optical cooling of atoms; trapping  (2)
  • Key words. Selenium; glutathione peroxidase; peroxides; overexpression; knockouts.  (1)
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  • Electronic Resource  (3)
  • Loose Leaf
  • Online Resource
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  • 2000-2004  (3)
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    The glutathione peroxidases (2001)
    Springer
    Cellular and molecular life sciences 57 (2001), S. 1825-1835 
    Details
    ISSN: 1420-9071
    Keywords: Key words. Selenium; glutathione peroxidase; peroxides; overexpression; knockouts.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. There are several proteins in mammalian cells that can metabolize hydrogen peroxide and lipid hydroperoxides. These proteins include four selenium-containing glutathione peroxidases that are found in different cell fractions and tissues of the body. This review considers the structure and distribution of the selenoperoxidases and how this relates to their biological function. The functions of the selenoperoxidases were originally studied in systems where their activity was manipulated by changing dietary selenium levels. More recently, molecular techniques have allowed overexpression of selenoperoxidases in cell lines and animals. Additionally, cellular glutathione peroxidase knockout mice have been used to investigate the functions of this protein. From this work it is clear that the selenoperoxidases are involved in cell antioxidant systems. However, they also have more subtle functions in ensuring the regulation and formation of arachadonic acid metabolites that are derived from hydroperoxide intermediates. The range of biological processes, which are potentially dependent on optimal selenoperoxidase activity in mammals, emphasises the importance of achieving adequate selenium intake in the diet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00000664
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Coherent control of the self-trapping transition (2001)
    Springer
    The European physical journal 20 (2001), S. 451-467 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 03.75.Fi Phase coherent atomic ensembles; quantum condensation phenomena – 05.30.Jp Boson systems – 32.80.Pj Optical cooling of atoms; trapping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We discuss the dynamics of two weakly coupled Bose-Einstein condensates in a double-well potential, contrasting the mean-field picture to the exact N-particle evolution. On the mean-field level, a self-trapping transition occurs when the scaled interaction strength exceeds a critical value; this transition essentially persists in small condensates comprising about 1000 atoms. When the double-well is modulated periodically in time, Floquet-type solutions to the nonlinear Schrödinger equation take over the role of the stationary mean-field states. These nonlinear Floquet states can be classified as “unbalanced” or “balanced”, depending on whether or not they entail long-time confinement of most particles to one well. Since the emergence of unbalanced Floquet states depends on the amplitude and frequency of the modulating force, we predict that the onset of self-trapping can efficiently be controlled by varying these parameters. This prediction is verified numerically by both mean-field and N-particle calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00011106
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Instanton approach to Josephson tunneling between trapped condensates (2001)
    Springer
    The European physical journal 17 (2001), S. 351-363 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 03.75.Fi Phase coherent atomic ensembles; quantum condensation phenomena – 05.30.Jp Boson systems – 32.80.Pj Optical cooling of atoms; trapping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: An instanton method is proposed to investigate the quantum tunneling between two weakly-linked Bose-Einstein condensates confined in double-well potential traps. We point out some intrinsic pathologies in the earlier treatments of other authors and make an effort to go beyond these very simple zero order models. The tunneling amplitude may be calculated in the Thomas-Fermi approximation and beyond it; we find it depends on the number of the trapped atoms, through the chemical potential. Some suggestions are given for the observation of the Josephson oscillation and the MQST.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530170010
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    Paper (German National Licenses)
    Fulltext
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