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  • 1980-1984  (2)
  • 1965-1969  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 38 (1982), S. 477-482 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The stacking sequence of a new SiC polytype 45Rb, which was synthesized at room temperature is (433212)3. This implies that the Zhdanov symbol 1 in the stacking sequence, except for the 2H polytype, might be a special characteristic of the structure of SiC grown at low temperatures. If this is true, the recently reported 5H polytype SiC found in limestone, dolomite and alluvial deposit, which can be deduced as (41) stacking, may be authigenic and might have grown at a low temperature. This idea may suggest the general distribution of SiC in limestone and in other low- temperature deposits. Unmetamorphosed limestones of about 20 localities were examined, and SiC was found in seven of those localities, although the 45Rb and 5H polytypes have not been found yet in these samples.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 37 (1981), S. 206-208 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A new probe (tip diameter=700 μm) consisting of a micro-light guide and a silver wire electrode was constructed to measure pyridine nucleotide fluorescence and field potentials from nerve tissues. Good kinetic correlations were found between the changes in field potentials and tissue pyridine nucleotide fluorescence caused by stoppage or by resumption of superfusion.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 98 (1966), S. 58-65 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Reaktion von H2O mit Al-triäthyl (Al(C2H5)3) und der Initiierungsmechanismus der Polymerisation wurden durch Anwendung von tritiiertem H2O untersucht. Beträchtliche Tritium-Anteile aus tritiiertem H2O verblieben im System Al(C2H5)3/H2O bei Zimmertemperatur. Wärmebehandlung des Systems bewirkte eine starke Abnahme des Tritium-Gehalts und einen Verlust der Katalysatoraktivität. Mit dem System Al(C2H5)3/H2O hergestellte Polymere erwiesen sich als radioaktiv. Auf Grund der Ergebnisse wurde angenommen, daß im System Al(C2H5)3/H2O acider Wasserstoff vorhanden und für die Initiierung einer kationischen Polymerisation verantwortlich ist.
    Notes: The reaction between H2O and triethylaluminum Al(Et3) as well as the initiation mechanism of the polymerization by the system AlEt3/H2O have been examined by means of tritiated water, Considerable amount of tritium from tritiated water remained in the system AlEt3/H2O prepared at room temperature. Heat treatment of the system causes both the extensive decrease of tritium content and loss of catalyst activity. Polymers of styrene and isobutyl vinyl ether prepared by the system AlEt3/H2O were found to be radioactive. These findings have been taken to assume that acid hydrogen does exist in the system AlEt3/H2O and is directly responsible for the initiation of cationic polymerization.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
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