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  • 1990-1994  (4)
  • 1985-1989  (5)
  • 1960-1964  (2)
  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 1080-1085 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low-temperature photoluminescence experiments were performed on high-purity InP substrates as a function of heat treatment, flat-profile ion implantation and subsequent annealing procedures. Whereas the well resolved near band edge luminescence proved the superior substrate quality, up to 6 sharp luminescence lines (some of them not reported so far) and one shallow broad-band emission were observed after Si3N4 deposition and various annealing procedures. From the temperature dependence of the luminescence peak intensities the activation energies of the novel lines were determined and discussed in terms of excitons bound to processing-induced complex defects. These assignments are supported by the observation of a strong enhancement of the luminescence after low dose Ar+ ion implantation.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 349-351 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Photoluminescence experiments under resonant excitation have been performed at low temperature in Mg+-implanted bulk InP. The energy difference between the ground 1S3/2 and excited 2S3/2 states of the Mg acceptor is accurately measured by two-hole spectroscopy of Mg-acceptor bound exciton. Selective excitation of donor-acceptor pairs luminescence allows the identification of a set of 2P3/2 and 2P5/2 excited states. The measured values to be compared with similar published data obtained for Zn and C represent an additional step in the process of accurate identification of acceptors in InP.
    Type of Medium: Electronic Resource
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 1412-1416 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The nucleation and disappearance of current filaments in homogeneously slightly doped semiconductors during avalanche breakdown at low temperatures is quantitatively evaluated in terms of a minimum and maximum value of the filament current. Both values arise from a model based on the power balance in the system. Experimental results obtained by the two-dimensional imaging of the filament configurations in n-GaAs and p-Ge agree quantitatively with the predictions of our power balance model.
    Type of Medium: Electronic Resource
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  • 5
    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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  • 6
    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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  • 7
    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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  • 8
    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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  • 9
    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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  • 10
    ISSN: 0032-8332
    Keywords: Macaca fascicularis ; Perception ; Photographic slides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The present study was designed to assess a monkey's perception of specific visual stimuli by measuring both the behavioral responses and duration of attention to the presentation of photographic slides. Five adult male cynomolgus macaques (Macaca fascicularis) were placed individually in an open field apparatus and presented a series of slides consisting of apples, a gorilla mask, a collage of colors, a human being, and a plain field. The slide of the gorilla mask followed by that of the human being received the most attention while the plain field received the least. In addition, the gorilla mask and human being elicited a range of behavioral responses with the higher ranking animals displaying a greater number of aggressive responses and the lower ranking animals displaying a greater number of submissive gestures. Taken together, these data would suggest that the slides of the gorilla mask and the human being were perceived by the monkeys as threatening. These results are consistent with a continuing theme observed among a number of studies of primate social perception — namely, that potentially threatening stimuli are a significant determinant of visual observing.
    Type of Medium: Electronic Resource
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