Results 171 to 180 of about 2,826 (207)
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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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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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Reduction of Nitrates by Azotobacter indicum and Azotobacter chroococcum Cultures
Applied Biochemistry and Microbiology, 2002The capacity for denitrification was studied in Azotobacter bacteria, which are free-living nitrogen-fixing obligatory aerobes. Data on nitrate reduction to nitrites and nitric oxide by A. indicum under anaerobic conditions were obtained for the first time for genus Azotobacter.
E. K. Furina +4 more
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Nitrate permease from Azotobacter chroococcum
Physiologia Plantarum, 1993Active transport systems in bacteria can be divided into two groups: those that are osmotic shock‐resistant with one single membrane protein, and those that are shock‐sensitive and have a membrane‐bound protein complex plus a soluble periplasmic protein.
A. Paneque +3 more
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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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The ultrastructure of vegetative cells and cysts of Azotobacter chroococcum
Archiv f�r Mikrobiologie, 1962The ultrastructure of vegetative cells and cysts of Azotobacter chroococcum shows that these two morphological forms are distinctly different. The cyst is surrounded by a multi-layered envelope consisting of the following structural elements: an irregularly outlined exocystorium and a cyst coat made up of an outer dense and an inner less dense layer ...
Y T, TCHAN +2 more
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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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Associative symbiosis of Azotobacter chroococcum and higher plants
Zentralblatt für Bakteriologie, Parasitenkunde, Infektionskrankheiten und Hygiene. Zweite Naturwissenschaftliche Abteilung: Mikrobiologie der Landwirtschaft, der Technologie und des Umweltschutzes, 1979The association between a selected strain of Azotobacter chroococcum and seven plants was investigated in water cultures under sterile conditions. Azotobacter population progressively increased in the nutrient solution and on the rhizoplane. Microbial propagation depends on the type of plant, being much higher in presence of wheat, followed by barley ...
M, Monib +3 more
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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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