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  • 1
    Electronic Resource
    Electronic Resource
    Utilization of l-alanine as carbon and nitrogen source by Deusulfovibrio HL21 (1986)
    Springer
    Archives of microbiology 145 (1986), S. 272-276 
    Details
    ISSN: 1432-072X
    Keywords: Desulfovibrio ; Alanine degradation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Desulfovibrio HL21 is unable to grow with amino acids as energy substrates. Alanine, serine, aspartate and to some extent glutamate were used as carbon and nitrogen sources in the presence of hydrogen as the energy substrate. Dense cell suspensions converted alanine stoichiometrically to acetate, NH 4 + and presumably HCO 3 - , but at a very low rate. Desulfovibrio HL21 cells grown with alanine as carbon and nitrogen source contained increased levels of NAD(P)-dependent l-alanine dehydrogenase as compared to cells grown with NH4Cl as nitrogen source. Unfavourable kinetic properties of this alanine dehydrogenase, repression of the synthesis of the enzyme by NH 4 + and a low rate of NADH oxidation all have a negative effect on the rate of degradation of alanine and may partly explain the inability of the strain to grow with alanine as an energy substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00443657
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Feeding chronology of juvenile piranhas, Pygocentrus notatus, in the Venezuelan llanos (1990)
    Springer
    Environmental biology of fishes 29 (1990), S. 51-57 
    Details
    ISSN: 1573-5133
    Keywords: Fish diets ; Fish feeding ; Diel feeding ; Characidae ; Serrasalminae ; Serrasalmus ; South American fish ; Tropical fish
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis During the 1988 rainy season, I studied the 24 h feeding chronology of juvenile (40–68 mm standard length) piranhas, Pygocentrus notatus (Characidae: Serrasalminae) from a natural population inhabiting a small savanna stream in Apure State, Venezuela. Stomach contents analyses, supported by laboratory determinations of digestion rate, showed that these fish are primarily diurnal carnivores. Predatory activity on 4–5 August 1988 increased markedly after sunrise, peaked around 1100 h, and essentially stopped after sunset. Means of stomach content weight-to-fish weight ratios among the periods sampled were significantly different. Small fish were the major prey at all hours (81% of total prey volume). Underlying factors responsible for the observed 24 h feeding patterns were not investigated, but avoidance of predation by adult piranhas, which were very active near sunset, may have been important.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00000568
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    Paper (German National Licenses)
    Fulltext
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