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  • Electronic Resource  (3)
  • 2000-2004
  • 1985-1989  (3)
  • 1987  (3)
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  • Electronic Resource  (3)
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  • 2000-2004
  • 1985-1989  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Tetrakis(methyltelluro)tetrathiafulvalene (TTeC 1 TTF), a high-mobility organic semiconductor (1987)
    [s.l.] : Nature Publishing Group
    Nature 329 (1987), S. 39-40 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The molecular structure of this class of compounds, tetrakis(methyltelluro)tetrathiafulvalene (abbreviated to TTeCr TTF), is shown below. A series of tetrakis(alkyltelluro)tetrathia-fulvalenes were synthesized using the method developed by H3C-Te S ySNxTe-CH3 H3C-Te S S Te-CH3 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/329039a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Transient Ca2+-channel current characterized by a low-threshold voltage in zona glomerulosa cells of rat adrenal cortex (1987)
    Springer
    Pflügers Archiv 408 (1987), S. 351-355 
    Details
    ISSN: 1432-2013
    Keywords: Ca2+-current ; Glomerulosa cell of adrenal cortex ; Whole-cell recording ; K+-stimulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Voltage-gated Ca2+-current was identified in single isolated cells of the zona glomerulosa of adrenal cortex and its properties were studied by the “tight-seal” whole cell recording technique. The Ca2+-channel current was dissected from the net current by dialyzing the cells with CsCl. The identified Ca2+-current was found to be activated by a relatively small depolarization only when the cells were held at a large negative holding potential, but it was inactivated within 10–30 ms. The time course of activation and inactivation was voltage-dependent and became faster when the amplitude of depolarization was increased. The transmembrane potential of the glomerulosa cells was highly sensitive to [K+]e, the slope of the potential change per tenfold change in [K+]e being 48 mV. An increase in [K+]e from 4.7 to 10 mM induce a membrane depolarization by 15 mV, which was sufficient to cause the membrane to reach the threshold potential (−60 mV) for activation of the Ca2+-current at physiological concentration of [Ca2+]e (2.5 mM −CaCl2). The observed properties of the Ca2+-current and K+-dependence of the membrane potential may give reasonable explanation for the mechanism of Ca2+-uptake and consequent aldosterone secretion induced by a small increase in [K+]e, which is known to be one of the major stimulations for aldosterone secretion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00581128
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Laser isotope separation of titanium by two-step photoionization (1987)
    Springer
    Applied physics 44 (1987), S. 163-166 
    Details
    ISSN: 1432-0649
    Keywords: 32.80.Fb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Titanium isotopes were selectively excited and photoionized using a two-step photoionization method, and the isotope separation was demonstrated, in which a separation factor of around 15 for50Ti was obtained. Spectroscopic parameters such as isotope shifts, photo-ionization cross section and excited state lifetimes were also measured. Isotope shifts up to 0.92 GHz were obtained for the transitions between 0 and 19938 cm−1 or between 170 and 20006 cm−1 among five isotopes. The cross section is 7.4×10−17 cm2 for the photo-ionization. The excited state lifetimes are 330±20 ns for 19938 cm−1, 260±15 ns for 20006 cm−1 and 250±15 ns for 20126 cm−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692318
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    Paper (German National Licenses)
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