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  • 1
    Digitale Medien
    Digitale Medien
    Selenium requirement for active xanthine dehydrogenase from Clostridium acidiurici and Clostridium cylindrosporum (1979)
    Springer
    Archives of microbiology 121 (1979), S. 255-260 
    Details
    ISSN: 1432-072X
    Schlagwort(e): Purine fermentation ; Xanthine dehydrogenase ; Selenium ; Tungsten ; Molybdenum ; Clostridium acidiurici ; Clostridium cylindrosporum
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The xanthine dehydrogenase of Clostridium acidiurici and C. cylindrosporum was assayed with methyl viologen as acceptor. In C. acidiurici the basal activity level was about 0.3 μmol/min x mg of protein. Cells grown on uric acid in the presence of 10-7 M selenite showed a 14-fold increase in xanthine dehydrogenase activity, which decreased with higher selenite concentrations (10-5 M). The supplementation with 10-7 M molybdate or tungstate was without effect. High concentrations of tungstate decreased the xanthine dehydrogenase if selenite was also present. In comparison, high concentrations of molybdate affected only a small decrease in activity level at the optimal concentration for selenite and relieved to some degree the inhibitory effect of 10-5 M selenite. With hypoxanthine and xanthine as substrates for growth again only the addition of selenite was necessary to show a similar increase in xanthine dehydrogenase activity. C. acidiurici could be grown in a mineral medium. Both xanthine dehydrogenase and formate dehydrogenase exhibited the highest level of activity if selenite and tungstate were present in that medium. In C. cylindrosporum the basal activity level of xanthine dehydrogenase was about 0.95 μmol/min x mg of protein. The addition of 10-7 M selenite to the growth medium increased the activity level about 3-fold, but the highest level (3.7 U/mg) was reached if 10-7 M molybdate was also added. The presence of tungstate resulted in a decreased enzyme activity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00425064
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  • 2
    Digitale Medien
    Digitale Medien
    Pathways and regulation of N2, ammonium and glutamate assimilation by Clostridium formicoaceticum (1983)
    Springer
    Archives of microbiology 134 (1983), S. 167-169 
    Details
    ISSN: 1432-072X
    Schlagwort(e): Nitrogenase ; Glutamine synthetase ; Glutamate synthase ; Glutamate dehydrogenase ; Asparagine synthetase ; Alanine dehydrogenase ; β-Methylaspartase ; Clostridium formicoaceticum
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Clostridium formicoaceticum possesses the following enzymes for the assimilation of N2 and NH 4 + : nitrogenase, glutamine synthetase, NADH- and NADPH-dependent glutamate synthase, NADH- and NADPH-dependent glutamate dehydrogenase, NADPH-dependent alamine dehydrogenase, and NH 4 + -dependent asparagine synthetase. Nitrogenase and glutamine synthetase are repressed and alanine dehydrogenase is induced by NH 4 + , while the synthesis of the other enzymes is not influenced by the extracellular NH 4 + level. Glutamate is degraded via glutamate mutase and β-methylaspartase.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00407953
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  • 3
    Digitale Medien
    Digitale Medien
    Eubacterium angustum sp. nov., a Gram-positive anaerobic, non-sporeforming, obligate purine fermenting organism (1984)
    Springer
    Archives of microbiology 140 (1984), S. 2-8 
    Details
    ISSN: 1432-072X
    Schlagwort(e): Eubacterium angustum ; Purine metabolism ; Xanthine dehydrogenase ; Selenium
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A strictly anaerobic, uric acid, xanthine, and guanine fermenting bacterium was isolated from sewage sludge requiring thiamine as a vitamin. Acetate, formate, ammonia and CO2 were products. Cells were Gram-positive, straight rods, 3 to 6.5 μm long and 1.1 to 1.5 μm wide. They were non-motile, however, possessed flagella. Spore formation could not be obtained. The guanine-plus-cytosine content (G+C) of its deoxyribonucleic acid was 40.3 mol%. Based on these features, the organism belongs to the genus Eubacterium. Due to its restricted substrate spectrum and its inability to utilize arginine or to form cytochromes like E. lentum, this organism did not resemble any of the previously described species of Eubacterium. Therefore, it is proposed to form a new species Eubacterium angustum sp. nov.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00409763
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