Results 191 to 200 of about 14,962 (246)

Pectic enzymes of Azospirillum brasilense [PDF]

, 1991
The production and activity of pectic enzymes elaborated by Azospirillum brasilense (strain C.A. 10), a diazotroph isolated from the rhizosphere of rice (Oryza sativa L.), was studied as this organism is known to enter through the middle lamella to colonize the histosphere of rice roots.
N. N. Prasad, C. Sekar
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Tn5-Mutagenesis in Azospirillum Brasilense [PDF]

, 1988
A system is described for transposon mutagenesis of Azospirillum brasilense using the mobilizable plasmid pSUP2021. Mutants were selected on rich medium containing kanamycin and streptomycin. All the auxotrophs isolated were impaired in their sulfur metabolism. Calcofluor-dark Tn5 mutants were tested for their ability to form flocs.
A. P. Van Gool, M. Vanstockem, Jozef Vanderleyden, K. Michiels, A. Milcamps   +4 more
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Biosynthesis of gold nanoparticles by Azospirillum brasilense

Microbiology, 2013
Plant-associated nitrogen-fixing soil bacteria Azospirillum brasilense were shown to reduce the gold of chloroauric acid to elemental gold, resulting in formation of gold nanoparicles. Extracellular phenoloxidizing enzymes (laccases and Mn peroxidases) were shown to participate in reduction of Au+3 (HAuCl4) to Au(0).
Valentina E. Nikitina, M. A. Kupryashina, E. G. Ponomareva, E. P. Vetchinkina, Andrey M. Burov   +4 more
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Mutants of Azospirillum brasilense resistant to methylammonium

Archives of Microbiology, 1988
One hundred and twenty-nine mutants of Azospirillum brasilense strain Sp6, resistant to methylammonium, were isolated. Three of the mutants were found to be able to reduce acetylene in the presence of 4 mM ammonium or 120mM methylammonium, concentrations which strongly reduced the nitrogenase activity of the parental strain. Under N2-fixing conditions,
TURBANTI, LUCA, BAZZICALUPO, MARCO, E. Casalone, FANI, RENATO, GALLORI, ENZO, POLSINELLI, MARIO   +5 more
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Polysaccharide synthesis in Azospirillum brasilense

1995
The surface of bacteria consists of polysaccharides, like the exopolysaccharides and lipopolysaccharides and, as it is the case for Azospirillum brasilense, glycoproteins like glycosylated flagella. The precursors for the synthesis of polysaccharides are sugarnucleotides.
Paul De Troch, Daniel J. Petersen, Jos Vanderleyden   +2 more
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[Atypical R-S dissociation in Azospirillum brasilense].

Mikrobiologiia, 2003
It was found that atypical R-S dissociation in the type strain A. brasilense Sp7 is not accompanied by drastic changes in the carbohydrate moieties of bacterial lipopolysaccharides but is rather due to different contributions of two O-specific polysaccharides (found in both R and S dissociants) to the age-dependent architectonics of the cell surface.
L. Yu. Matora, S. Yu. Shchegolev, L. P. Petrova, Gennady L. Burygin, Oksana B. Serebrennikova   +4 more
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Carotenoid production and phenotypic variation in Azospirillum brasilense

Research in Microbiology, 2017
We assessed the occurrence of phenotypic variation in Azospirillum brasilense strains Sp7, Cd, Sp245, Az39 and phv2 during growth in rich media, screening for variants altered in colony pigmentation or extracellular polysaccharide (EPS) production. Previous studies showed that EPS-overproducing variants of Sp7 appear frequently following starvation or ...
Dafna Tamir-Ariel, Gal Reem Brenholtz, Saul Burdman, Yaacov Okon   +3 more
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Mechanistic studies on Azospirillum brasilense glutamate synthase

Biochemistry, 1991
The reaction mechanism of Azospirillum brasilense glutamate synthase has been investigated by several approaches. 15N nuclear magnetic resonance studies demonstrate that the amide nitrogen of glutamine is reductively transferred to 2-oxoglutarate in an irreversible manner with no release of the transferred ammonia group into the medium.
Maria Rescigno, Maria A. Vanoni, Dale E. Edmondson, Giuliana Zanetti, Bruno Curti   +4 more
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Co-inoculation of maize with Azospirillum brasilense and Rhizobium tropici as a strategy to mitigate salinity stress.

Functional Plant Biology, 2018
Plants are highly affected by salinity, but some plant growth-promoting bacteria (PGPB) may trigger induced systemic tolerance (IST), conferring protection against abiotic stresses.
Josiane Fukami, C. de la Osa, F. Ollero, M. Megias, M. Hungria   +4 more
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Construction of an Azospirillum brasilense Sp7 recA mutant

Molecular and General Genetics MGG, 1990
Cosmid clones encoding the recA gene of Azospirillum brasilense were isolated by intergeneric complementation of an Escherichia coli recA mutant. Site-directed Tn5 mutagenesis and subcloning of one complementing cosmid clone allowed us to localize the A. brasilense recA gene on a 1.2 kb DNA fragment.
J. Vanderleyden, K. Michiels, Chris Croes   +2 more
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