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  • Nitrogen fixation  (2)
  • Ammonium metabolism  (1)
  • Azotobacter vinelandii  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Inorganic nitrogen metabolism in two cellulose-degrading clostridia (1986)
    Springer
    Archives of microbiology 145 (1986), S. 159-161 
    Details
    ISSN: 1432-072X
    Keywords: Clostridium cellobioparum ; Clostridium thermocellum ; Ammonium assimilation ; Nitrogen fixation ; Nitrogen control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Inorganic nitrogen metabolism in two cellulose degrading clostridia, the mesophile Clostridium cellobioparum and the thermophile Clostridium thermocellum was investigated. Both strains show acetylene reduction (i.e. possibly nitrogenase activity), contain glutamine synthetase, glutamate dehydrogenase and glutamate-dependent transaminases. C. cellobioparum additionally contains a NADH-dependent glutamate synthase and a NH 4 + -repressible glycine dehydrogenase (NADPH). Remarkably, acetylene reduction in C. thermocellum is not repressed by ammonium, casting doubt whether this activity is due to nitrogenase. The results are compared with the data from other saccharolytic clostridia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00446774
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  • 2
    Electronic Resource
    Electronic Resource
    Degradation of the nitrogenase proteins during encystment of Azotobacter vinelandii (1986)
    Springer
    Archives of microbiology 145 (1986), S. 287-289 
    Details
    ISSN: 1432-072X
    Keywords: Azotobacter vinelandii ; Encystment ; Nitrogenase ; Protein degradation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Nitrogenase activity in cell-free extracts of Azotobacter vinelandii declines during encystment. Upon germination a rapid increase in activity is observed, which is suppressed by rifampicin, suggesting that de novo biosynthesis of the nitrogenase proteins is required. The decline of activity during encystment is accompanied by disappearance of both nitrogenase proteins from cell extracts, indicating irreversible proteolysis. Total proteinase activity does not change significantly during encystment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00443660
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  • 3
    Electronic Resource
    Electronic Resource
    Ammonia-excreting mutants ofKlebsiella pneumoniae with a pleiotropic defect in nitrogen metabolism (1996)
    Springer
    Archives of microbiology 166 (1996), S. 388-393 
    Details
    ISSN: 1432-072X
    Keywords: Ammonium metabolism ; glnAntrBC ; Nitrogenase regulation ; Nitrogen control ; Ammonia excretion ; Amino acid utilization ; Ntr
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Enterobacterial mutants defective in the nitrogen control regulatory system (Ntr) generally display a pleiotropic phenotype with regard to expression and regulation of several enzymes and transport systems involved in the assimilation of N sources. This report describes the isolation and characterization of similar pleiotropic mutants ofKlebsiella pneumoniae that cannot be complemented byntr genes. The strains excreted ammonia, were unable to grow on a number of N sources, and contained low glutamine:2-oxoglutarate amino transferase and normal, but unmodifiable glutamine synthetase activities and a nitrogenase level largely unaffected by ammonium, but still repressible by an amino acid mixture. Genetic studies suggested that this phenotype is due to overexpression of an unknown regulatory protein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01682984
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  • 4
    Electronic Resource
    Electronic Resource
    Fixation of Atmospheric Nitrogen by MicroorganismsIn Memory of Artturi Ilmari Virtanen (1975)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 14 (1975), S. 80-86 
    Details
    ISSN: 0570-0833
    Keywords: Nitrogen fixation ; Nitrogen fixation ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Research on the enzymatic assimilation of molecular nitrogen (N2 fixation) has made decisive advances in recent years. Both the purely scientific aspects of this process and its industrial implications are assuming ever-increasing interest. Some of the results most important from the biochemical point of view have been collected in the present report.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.197500801
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