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  • 1985-1989  (5)
  • 1960-1964  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Sociology 15 (1989), S. 187-209 
    ISSN: 0360-0572
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Sociology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 71 (1988), S. 171-178 
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two-dimensional imaging of current filament patterns generated in homogeneousn-type GaAs during avalanche breakdown at low temperatures is reported. The self-generated formation and subsequent growth behavior of distinct single- and multifilament configurations could globally be visualized by means of a scanning electron microscope equipped with a liquid-helium stage. From local conductivity measurements in the smallest possible filaments (typical diameter of about 10 μm) carrier mobilities as high as about 4·106 cm2/Vs at 4.2 K were estimated. Such high-mobility filament channels may become interesting for applications in ultrafast electronic circuits.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    European food research and technology 125 (1964), S. 375-381 
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Zusammenfassung 1. Verschiedene Weinhefen vermochten einen großen Teil der ursprünglich vorliegenden Äpfelsäure bei der Vergärung von Traubensaft und synthetischen Substraten abzubauen bzw. zu assimilieren. Unter aeroben Bedingungen war dieser Abbau ausgeprägter als unter Luftabschluß. 2. Ein Teil der metabolisierten Äpfelsäure wurde in Bernsteinsäure übergeführt. Ferner zeigte sich regelmäßig eine geringe Milchsäurebildung. Eine Alkoholbildung aus Äpfelsäure konnte nicht festgestellt werden.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 277 (1985), S. 153-155 
    ISSN: 1432-069X
    Keywords: Dithranol ; Metabolization in epidermis ; Dithranol-Brown ; Copper
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-0630
    Keywords: 05.45.+b ; 72.20.Ht ; 72.70.+m
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We present experimental investigations on the spatio-temporal nonlinear current flow in the post-breakdown regime of p-germanium at liquid-helium temperatures. The basic nonlinear effects are characterized in terms of the underlying semiconductor physics, taking into account the influence of different experimental parameters.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 46 (1963), S. 321-328 
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung In der vorliegenden Arbeit wurde unter anderem die Dissimilation von Äpfelsäure unter aeroben und anaeroben Bedingungen (Stickstoff-Atmosphäre) durch einen Stamm von Schizosaccharomyces pombe untersucht. Es zeigte sich, daß intakte, ruhende Zellen dieser Hefe l-Malat sowohl unter anaeroben wie aeroben Bedingungen vollständig abzubauen vermögen. Während die aerobe Dissimilation gemäß der Bruttogleichung l-Äpfelsäure +3O2→4CO2+3H2O verlief, erfolgte der anaerobe Abbau stöchiometrisch zu Äthanol und CO2. Die anaerobe Dissimilation von Oxalessigsäure und Brenztraubensäure lieferte Äthanol, Acetoin, Essigsäure und CO2. Unter aeroben Bedingungen war die untersuchte Hefe ferner imstande, eine ganze Reihe weiterer Mono-und Dicarbonsäuren mit unterschiedlicher Intensität zu oxydieren. Citronen-, Milchund Weinsäure wurden nicht angegriffen. Eine Bildung von Milchsäure konnte in keinem Fall nachgewiesen werden.
    Notes: Summary The aerobic and anaerobic metabolism of l-malate by Schizosaccharomyces pombe, strain 106, has been investigated. l-malate was converted to ethanol and CO2 stoichiometrically by intact cells under anaerobic conditions; oxalacetate and pyruvate were dissimilated to ethanol, acetoin, acetic acid and CO2. Under aerobic conditions the same organism oxidized a number of mono- and dicarboxylic acids at different rates. Citric-, lactic-and tartaric acid were not attacked. l-malate was oxidized quantitatively to CO2 and H2O. Possible intermediates in this reaction have been investigated.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 72 (1988), S. 225-233 
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Conductivity and Hall-effect measurements were performed on single-crystallinep-doped germanium, electrically driven into low-temperature avalanche breakdown via impurity impact ionization. The electric transport properties were determined as a function of the applied electric field in the pre- and post-breakdown regime. The characteristic field dependence of the carrier density, mobility, and drift velocity was found to be reflected in smooth variations of the integral current flow. The breakdown mechanism was demonstrated to involve a mobility which sensitively depends upon the density of the mobile charge carriers. Our experimental findings are qualitatively explained by simple model approaches developed from established breakdown theories.
    Type of Medium: Electronic Resource
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