Azotobacter chroococcum

Immunopolysaccharides. Part I, Preliminary Studies of a Polysaccharide from Azotobacter chroococcum, containing a Uronic Acid, G. J. Lawson and M. Stacey, J. Chem. Soc., (1954) 1925-1931. 

Dilworth MJ, RR Eady (1991) Hydrazine is a product of dinitrogen reduction by the vanadium-nitrogenase from Azotobacter chroococcum. Biochem J 277 465 68. 

Miller RW, Eady RR (1988) Molybdenum and vanadium nitrogenases of Azotobacter chroococcum. Biochem J 256 429-432... 

Du L, Tibelius KH. 1994. The hupB gene of the Azotobacter chroococcum hydrogenase gene cluster is involved in nickel metabolism. Curr Microbiol 28 21. ... 

Tibehus KH, Du L, Tito D, Stejskal F. 1993. The Azotobacter chroococcum hydrogenase gene cluster sequences and genetic analysis of four accessory genes, hup A, hupB,hupY, and hup C. Gene 127 53-61. 

Sud et al. (1972) discovered that a strain of Achromobacter sp. utilized carbaryl as the sole source of carbon in a salt medium. The organism grew on the degradation products 1-naphthol, hydroquinone, and catechol. 1-Naphthol, a metabolite of carbaryl in soil, was recalcitrant to degradation by a bacterium tentatively identified as an Arthrobacter sp. under anaerobic conditions (Ramanand et al., 1988a). Carbaryl or its metabolite 1-naphthol at normal and ten times the field application rate had no effect on the growth of Rhizobium sp. or Azotobacter chroococcum (Kale et al., 1989). The half-lives of carbaryl under flooded and nonflooded conditions were 13-14 and 23-28 d, respectively (Venkateswarlu et al., 1980). 

Kale, S.P., Murthy, N.B.K.,andRaghu, K. Effect of carbofuran, carbaryl, and their metabolites on the growth of 7 //rzobjutnsp. and Azotobacter chroococcum. Bull. Environ. Contam. Toxicol, 42(5) 769-772, 1989. 

Azotobacter chroococcum produces ornithine-containing hydroxamate sidero-phores with molecular masses 800 and 844 Da (difference of one carboxyl group ) of unknown structure (115a). 

Recently, a second or alternative nitrogenase has been isolated from Azotobacter vinelandii (21) and Azotobacter chroococcum (22) that contains vanadium as opposed to molybdenum. The MoFe and VFe nitrogenase proteins from A. vinelandii (called Av and. 4vl , respectively) are known to have different polypeptide structures and it obviously of interest to know to what extent the cluster composition is conserved. Variable temperature MCD studies of the as isolated and thionine oxidized proteins provided a convenient means of addressing this question. 

Abou Aly and Gomaa (2002) evaluated the effect of inoculation with diazotrophs (Azotobacter chroococcum or Azospirillum brasilense) combined with either Bacillus megatherium var. phosphaticum or Glomus mosseae, in the presence of half the recommended dose of N, on the growth and yield of coriander. Inoculation with A. chroococcum or A. brasilense, combined with G. mosseae,... 

That hydroxylamine might not be an obligatory intermediate, or occur as a free intermediate, in the reduction of nitrite to ammonia is suggested by the properties of nitrite reductases of Azotobacter chroococcum and Escherichia coli. The former is an adaptive enzyme, the formation of which requires nitrate or nitrite in the culture (31,2). It is FAD-depen-dent and presumably contains metals and p-mercuribenzoate inhibitable... 

Azotobacter agile, transhydrogenase of, 54 Azotobacter chroococcum nitrite reductase of, 275, 276-277 transhydrogenase of, 54 Azotobacter vinelandii NADH dehydrogenase of, 221... 

The Mo requirement of nitrogen-fixing microbe, Azotobacter chroococcum, sp. 6, extracted from Mo-enriched soil of the Ankawan province is higher than that of the... 

Polysaccharides isolated from Rhizobium radicicolum and Azotobacter chroococcum cross-react in high dilution in horse anti-Pn III. Part of the structure of the Rhizobium polysaccharide bears a close resemblance to that of Sill, inasmuch as both contain cellobiouronic acid in their respective... 

Figure 2 Switch on and switch off of nitrogenase in response to aeration levels. Live cells from a continuous culture of Azotobacter chroococcum were shaken gently in air while their nitrogen-fixing activity was measured using the acetylene test. Shaking, and therefore aeration, was intensified at A and returned to its original value at B. Notice the brief delay in reaching maximum activity again. After Reference 1).

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