Azotobacter
Mostrando 13-24 de 487 artigos, teses e dissertações.
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13. Biotransformação da violaceina
O composto 3-[1,2-dihidro-5-(5-hidroxi-1H-indol-3-il)-2-oxo-3H-pirrol-3- ilideno]-1,3-dihidro-2H-indol-2-ona, conhecido como violaceína, é o principal pigmento produzido pela bactéria Chromobacterium violaceum (CCT 3496). Este pigmento violeta apresenta diversas atividades biológicas como antibiótica, antitumoral, antichagásica, antimicobacteriana e an
Publicado em: 2001
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14. Estudo de substancias de baixa massa molar que mimetizam as fenoloxidases com aplicações em tratamentos de efluentes industriais
Neste trabalho, foi determinada a atividade de fenoloxidase do complexo desferrioxamina B (DB)/Fe(III) em pH 3,0, no intervalo de temperatura de 25-30°C, utilizando como substrato a o-dianisidina e a seringaldazina. A adição de flavina mononucleotídica (FMN) mostrou afetar a atividade de fenoloxidase de DB. Estudos mecanísticos, com a técnica de EPR, e
Publicado em: 1999
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15. Homologous structural genes and similar induction patterns in Azotobacter spp. and Pseudomonas spp.
Intergeneric comparison of the three enzymes that initiate metabolism of protocatechuate in Azotobacter and Pseudomonas species revealed close immunological relatedness of isofunctional proteins. Furthermore, beta-ketoadipate induces all of the enzymes of the protocatechuate pathway (except protocatechuate oxygenase) in Azotobacter and in Pseudomonas species
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16. THE ELECTION TRANSPORT SYSTEM IN NITROGEN FIXATION BY Azotobacter, I. AZOTOFLAVIN AS AN ELECTRON CARRIER*
A flavoprotein, named azotoflavin, was isolated from an extract of Azotobacter vinelandii cells, which linked the reducing power generated by illuminated spinach chloroplasts to the Azotobacter nitrogen-fixing enzyme complex. The photoreduction of the yellow azotoflavin by chloroplasts produced a stable, free-radical semiquinone, blue in color, with properti
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17. Chelation Effects on Azotobacter Cells and Cysts
Goldschmidt, Millicent C. (University of Texas, Austin), and Orville Wyss. Chelation effects on Azotobacter cells and cysts. J. Bacteriol. 91:120–124. 1966.—Ethylenediaminetetraacetate (EDTA) is very toxic to Azotobacter in the presence of nitrogen compounds that form complexes with it. This appears to be due to stronger chelation of certain metal ions b
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18. THE ELECTRON TRANSPORT SYSTEM IN NITROGEN FIXATION BY Azotobacter. II. ISOLATION AND FUNCTION OF A NEW TYPE OF FERREDOXIN*
A new type of ferredoxin was isolated from Azotobacter vinelandii cells. The protein was able to replace the native chloroplast ferredoxin in the photoreduction of nicotinamide adenine dinucleotide phosphate (NADP) and functioned as a reductant for the Azotobacter nitrogenase.
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19. Physiological Study of Azotobacter Chroococcum. I: Influence of Vitamine B (?) and Nucleic Acid on Azotobacter
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20. Comparative Cytochrome Oxidase and Superoxide Dismutase Analyses on Strains of Azotobacter vinelandii and Other Related Free-Living Nitrogen-Fixing Bacteria
Quantitative N,N,N′,N′-tetramethyl-p-phenylenediamine (TMPD) oxidase and superoxide dismutase (SOD) analyses were performed on representative organisms of the family Azotobacteraceae. Azotobacter vinelandii, Azotobacter chroococcum, Azotobacter paspali, and Derxia gummosa exhibited high quantitative TMPD oxidase activities, and their extracts possessed v
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21. Stimulation of Agrobacterium tumefaciens Growth by Azotobacter vinelandii Ferrisiderophores
Azotobacter vinelandii stimulated the growth of Agrobacterium tumefaciens H2, H23, H24, H27, and ATCC 15955 on media containing insoluble iron sources. The Azotobacter vinelandii siderophores appeared to promote Agrobacterium tumefaciens growth by solubilizing mineral iron, and the ferrisiderophores so formed then acted as iron sources for Agrobacterium tume
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22. Technique for Isolating Phage for Azotobacter vinelandii
An enrichment technique was developed whereby azotophage could readily be isolated after inoculation of soil sites with Azotobacter vinelandii.
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23. POLYOL DEHYDROGENASES OF AZOTOBACTER AGILIS
Marcus, Leon (University of California, Davis), and Allen G. Marr. Polyol dehydrogenases of Azotobacter agilis. J. Bacteriol. 82:224–232. 1961.—Two soluble diphosphopyridine-linked polyol dehydrogenases are formed by Azotobacter agilis (A. vinelandii). The first, d-mannitol dehydrogenase is induced by d-mannitol and all of the pentitols except l-arabitol
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24. Correlation of Ultrastructure in Azotobacter vinelandii with Nitrogen Source for Growth
Azotobacter synthesizes an extensive internal membranous nework when grown with air (N2), i.e., under conditions when these bacteria fix nitrogen. Very slight quantities of internal membrane, concentrated mainly about the cell periphery, are formed when Azotobacter grows with fixed nitrogen, i.e., ammonia and amino acids. Compared to cells growing with ammon