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Regulation of Azotobacter chroococcum invertase
Archives of Microbiology, 1991Synthesis of the Azotobacter chroococcum invertase was found to be dependent on sucrose or raffinose in the growth medium. The activity of this invertase was slightly inhibited by glucose. Fructose, which by itself did not affect the enzyme activity, protected invertase from glucose inhibition.
Mercedes G. de la Vega +2 more
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Utilization of aromatic substances by Azotobacter chroococcum
Research in Microbiology, 1990Azotobacter chroococcum utilized catechol, protocatechuic acid and gentisic acid as sole carbon source. Rothera's test indicated the ortho cleavage of phenols. The cells displayed high levels of dioxygenase activity. Catechol was cleaved by the ortho pathway mediated by catechol 1,2-dioxygenase.
S, Balajee, A, Mahadevan
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Sensitivity of Azotobacter Chroococcum to some Antibiotics
Zentralblatt für Bakteriologie, Parasitenkunde, Infektionskrankheiten und Hygiene. Zweite Naturwissenschaftliche Abteilung: Allgemeine, Landwirtschaftliche und Technische Mikrobiologie, 1973Summary Low numbers of Azotobacter , and failure of the response of crops to inoculation with organism have been attributed to inhibition by many rhizosphere organisms, like actinomycetes and bacteria which produce toxic substances, including some known antibiotics (Krasil'nikov 1954). Inhibition of Azotobacter chroococcum by penicillin was noted
E, James, S T, Shende, A, Sen
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Biosynthesis of cytokinins by Azotobacter chroococcum
Soil Biology and Biochemistry, 1989Abstract Cytokinins were detected in culture nitrates of Azotobacter chroococcum, A. beijerinckii, A. vinelandii, Pseudomonas fluorescens and P. putida . The most prolific producer of cytokinins was A. chroococcum . Several purine ring constituents [adenine (ADE), adenosine, adenosine-5′-monophosphate, hypoxanthine, inosine and inosine-5 ...
K.F. Nieto, W.T. Frankenberger
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The hydrogen cycle in nitrogen-fixing Azotobacter chroococcum
Biochimie, 1978H2 will support nitrogenase activity (C2H2 reduction) in Azotobacter chroococcum with or without added carbon substrate. Results show that H2 is metabolised to transfer electrons to nitrogenase and to the respiratory chain to produce ATP. H2-supported nitrogenase activity is most significant at low carbon substrate concentrations, but also occurs at ...
C C, Walker, M G, Yates
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Nitrogen fixation by immobilized Azotobacter chroococcum
Enzyme and Microbial Technology, 1981Abstract A nitrogen-fixing bacterium, Azotobacter chroococcum, was immobilized in 2% agar gel. The optimum partial oxygen pressure, pO2, of immobilized cells was 0.2 atm, wherea s that of native cells was 0.05 atm. When continual nitrogen fixation was performed under aerobic conditions, the nitrogenase activity of immobilized cells increased with ...
Isao Karube +3 more
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Acetylenreduktion durch Azotobacter chroococcum in Bodenproben
Zentralblatt für Mikrobiologie, 1987Summary A description is given of the nitrogen fixation in samples of soil using the acetylene-reduction method. Fertilizing the soil by means of mannitol brings about an enrichment of the soil with nitrogen fixing bacteria ( Azotobacter ), even a low numbers of bacterias in the beginning so that a sufficiently high ethylene production may be ...
Ingeborg Schwebke, Helga Schröder
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Occurrence of Multiple Antibiotic Resistance in Azotobacter chroococcum
Zentralblatt für Mikrobiologie, 1989Of 117 strains of Azotobacter chroococcum, isolated from local soils the antibiotic resistance pattern to ten widely used antibiotics was determined by antibiotic disk and agar plate dilution method. Over 95% of the strains were resistant to 10 micrograms ml-1 concentration of ampicillin, chloramphenicol, erythromycin and tetracycline and 70% or more ...
S S, Sindhu +3 more
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On Carbohydrate Consumption by Azotobacter chroococcum
Annals of the Missouri Botanical Garden, 1920In a previous paper (Allen, '19) devoted mainly to the study of the cause of beneficial action resulting from mechanical agitation of Azotobacter solution cultures, the defects of existing experimental methods for the study of the physiology of this organism were pointed out.
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Some properties of purified nitrogenase of Azotobacter chroococcum
Biochimica et Biophysica Acta (BBA) - Enzymology, 1969Abstract The nitrogenase of Azotobacter chroococcum was fractionated into two essential components by anaerobic chromatography and elution with MgCl2. Fraction 1, which contained iron and molybdenum, was not damaged by exposure to air for 30 min at 20° but Fraciton 2, which also contained iron but only traces of molybdenum, was completed inactivated ...
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