Role of Cobalt in Nitrogen Fixation by Azotobacter chroococcum
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Symbiosis between Chlorella Sp. and Azotobacter Chroococcum and Nitrogen Fixation
Alfred Koch has given considerable attention to the subject of nitrogen fixation by bacteria as resulting from their symbiosis with alga~. Many others have also investigated various features of this problem. In spite of all this there are numerous questions which remain unsolved. The use of soil cultures for such studies is objectionable on account of the soil's complexity, its variety of flora...
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Nitrogenase was isolated and purified from wildtype and a tungsten-resistant mutant (LM2) of Azotobacter vinelandii strain OP derepressed on medium containing 1-10 mM W. While the enzyme from the wild-type strain contained the polypeptides of the conventional enzyme, metal analysis of component 1 demonstrated the existence of one atom each of molybdenum and tungsten. Furthermore, the ESR spectr...
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Nitrate-grown Azotobacter chroococcum ATCC 4412 cells lack the ability to fix N2. Nitrogenase activity developed after the cells were suspended in a combined nitrogen-free medium and was paralleled by a concomitant decrease in nitrate assimilation capacity. In such treated cells exhibiting transitory nitrate assimilation and N2-fixation capacity, nitrate or nitrite caused a short-term inhibitor...
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6 Dodge originally used "A" and "a" to designate the two sex types in Neurospora crassa. Lindegren later substituted the symbols "+" and "-" for these. Because of the desirability of using the symbol + for the normal allele of a gene and also to designate a positive experimental result, we prefer Dodge's original designations. 4 Neither conversion of pimelic acid to p-aminobenzoic acid by the n...
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Blumberg, W. E. & Peisach, J. (1974) Arch. Biochem. Biophys. 162,502-512 Cammack, R. (1973) Biochem. Biophys. Res. Commun. 54,548-554 Cammack, R., Rao, K. K. & Hall, D. 0. (1971) Biochem. Biophys. Res. Commun. 44,s-14 Coffman, R. E. & Stavens, B. W. (1970) Biochem. Biophys. Res. Commun. 41,163-169 Fee, J. A. & Palmer, G. (1971) Biochim. Biophys. Actu 249,175-195 Genonde, Ic, Schlaak, M. E., Bri...
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ژورنال
عنوان ژورنال: Nature
سال: 1964
ISSN: 0028-0836,1476-4687
DOI: 10.1038/203549a0