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  • 1
    Electronic Resource
    Electronic Resource
    Minority-carrier lifetime in GaAs thin films (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 598-599 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Double-heterostructure devices of type AlxGa1−xAs/GaAs have been fabricated in thin films grown by the cleavage of lateral epitaxial film for transfer process. The electron lifetime in the p-type GaAs is measured by photoluminescence and found to be 32 ns at the 5×1016 cm−3 doping level. This is the largest reported lifetime for a freestanding GaAs thin film.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99867
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  • 2
    Electronic Resource
    Electronic Resource
    The pharmacological effects of allicin, a constituent of garlic oil (1988)
    Springer
    Inflammation research 25 (1988), S. 182-190 
    Details
    ISSN: 1420-908X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Garlic has been used in herbal medicine for thousands of years. While garlic oil contains many components and has been widely studied, the pharmacology of pure allicin, a constituent of garlic oil, is not well understood. We report that allicin inhibits human platelet aggregationin vitro without affecting cyclooxygenase or thromboxane synthase activity or cyclic adenosine monophosphate (AMP) levels. Allicin does not alter the activity of vascular prostacyclin synthase. However, it inhibits ionophore A23187-stimulated human neutrophil lysosomal enzyme release.In vivo allicin dilates the mesenteric circulation of the cat independent of prostaglandin release or a beta adrenergic mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01969110
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  • 3
    Electronic Resource
    Electronic Resource
    Host-size-dependent sex ratios among parasitoid wasps: does host growth matter? (1989)
    Springer
    Oecologia 78 (1989), S. 420-426 
    Details
    ISSN: 1432-1939
    Keywords: Sex ratio ; Parasitoid wasps ; Host size
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Waage's (1982) hypothesis that host-size-dependent sex ratios will occur in parasitoids of nongrowing hosts and not in parasitoids of growing hosts is examined using published data on parasitoid wasps. Waage's hypothesis is supported as a general, but not absolute, rule: among solitary parasitoid wasps, a significantly greater proportion of parasitoids of nongrowing than of growing hosts show some evidence of host-size-dependent sex ratios (85% versus 42%, G=6.54, P〈 0.05). The premise of Waage's hypothesis-that for parasitoids which develop in a growing stage, host size at oviposition is not a good predictor of the amount of resources available to the developing parasitoid-is also examined. It is suggested that across host species Waage's premise will hold for some, but not all, parasitoids of growing hosts. Likely exceptions to Waage's premise, and thus his prediction, are discussed. Parasitoids of growing hosts which are expected to have evolved hostsize-dependent sex ratios include parasitoids which utilize a narrow size range of host species, parasitoids which can distinguish among host species by some criterion other than size, and parasitoids which utilize host species whose susceptible instars do not overlap in size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379119
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  • 4
    Electronic Resource
    Electronic Resource
    Extractive foraging and the evolution of primate intelligence (1986)
    Springer
    Human evolution 1 (1986), S. 361-372 
    Details
    ISSN: 1824-310X
    Keywords: extractive foraging ; primate intelligence ; cognition ; hominoid evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract One of the two major theories regarding the evolution of intelligence in primates is that feeding strategies determine mental development. Evidence for this theory is reviewed and related to extractive foraging, which is the act of locating and/or processing embedded foods such as underground roots and insects or hard-shelled nuts and fruits. It is shown that, although only cebus monkeys and chimpanzees in the wild use tools in extractive foraging, many other species of mammals (including primates) and birds are capable of extracting embedded foods without tools. Extractive foraging by primates is compared to extractive foraging by other mammals and birds to assess whether: 1) extractive foraging involves cognition, and 2) extractive foraging by primates is unique in a way that may mean it played a role in the development of intelligence among primates. This comparison reveals that some acts of extractive foraging by nonprimates are equally sophisticated as those of primates. It is suggested that extractive foraging played no significant role in the evolution of primate intelligence. Hypotheses for testing precise differences in extractive foraging ability across taxa are offered, and the roles of olfactory cues, manual dexterity, and strength in extractive foraging are evaluated. In conclusion, the hominization process is briefly reviewed in relation to foraging behavior. A «package» of traits that, in combination, is unique to hominids is discussed: tool-aided extractive foraging, division of labor by sex with food exchange, and feeding of juveniles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436709
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