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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Mechanisms of Ageing and Development 63 (1992), S. 247-256 
    ISSN: 0047-6374
    Keywords: Adenylate cyclase ; Aging ; Beta-adrenergic receptors ; Cellular senescence ; Division ; Fibroblasts
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    ISSN: 1432-2072
    Keywords: Serotonin ; Tryptophan ; Aggression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In order to study the effect of decreasing plasma tryptophan levels on aggressive responding in a controlled laboratory setting, we administered two doses (25 g and 100 g) of a tryptophan-free amino acid mixture to ten healthy male subjects after 24 h of a low tryptophan diet. Subjects were screened for current or past psychiatric, or non-psychiatric medical illness. Aggressive responding on a free-operant laboratory measure of aggression (the Point Subtraction Aggression Paradigm) and plasma tryptophan levels were measured before and after drinking the amino acid mixture. There was a significant increase in aggressive responding 5 h after the 100 g mixture and a significant increase in aggressive responding 6 h after the 25 g mixture compared to a baseline day when no drink was administered. There was also a significant decrease in plasma tryptophan at 5 hours after ingestion compared to baseline for both doses of amino acid mixture. This study supports the hypothesis that tryptophan depletion increases aggressive responding in healthy males in a laboratory setting; probably by decreasing brain serotonin.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Primates 28 (1987), S. 457-471 
    ISSN: 0032-8332
    Keywords: Chimpanzees ; Termites ; Tool-use ; Culture ; Mahale ; Gombe
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Nishida andUehara have contrasted two groups of chimpanzees at the Mahale Mountains in their manner of obtaining termites for food. K-group very rarely used tools, but evidence suggested that B-group did so regularly to fish forMacrotermes. They suggested that this difference was not a cultural one, but was explained by the absence ofMacrotermes in K-group's range. We attempted to test this hypothesis, and here examine the termite fauna in the ranges of the two groups. Our data confirm that termite-fishing was contingent upon the presence ofMacrotermes in B-group's range, and that cultural explanations are not necessary to explain the rarity of tool use by K-group, which instead could catchPseudacanthotermes without using tools. Comparison of the termite faunas in the ranges of K-group, of B-group, and of the chimpanzees at Gombe, suggest that, apart fromMacrotermes, two genera might be the main alternative prey:Pseudacanthotermes, which could be more commonly included in the diet at Gombe, and might also be eaten by B-group, andCubitermes which is available at both these sites.
    Type of Medium: Electronic Resource
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