Results 191 to 200 of about 6,481 (224)

Cell Ultrastructure in Azospirillum brasilense Biofilms

Microbiology, 2020
Due to the primary localization of both epiphytic and endophytic plant growth-promoting rhizobacteria on the surface of the plant root system, biofilm formation is an adaptive trait for these microorganisms. Under conditions of nitrogen limitation in liquid media, nitrogen-fixing Azospirillum brasilense strains switch mainly to the biofilm mode of ...
A. V. Shelud’ko, D. I. Mokeev, S. S. Evstigneeva, Yu. A. Filip’echeva, A. M. Burov, L. P. Petrova, E. G. Ponomareva, E. I. Katsy   +7 more
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Regulation of the nifHDK Genes Transcription in Azospirillum Brasilense

1991
The regulation of transcription of the structural genes for nitrogenase of Azospirilium brasilense was investigated. The function of two regions controlling the transcription of the nifH gene was studied. Data obtained suggested a mechanism of nif regulation in Azospirillum different from that described in Klebsiella pneumonlae. The effect of different
C. SCHIPANI, BAZZICALUPO, MARCO, FANI, RENATO, GALLORI, ENZO, A. GRIFONI, PASTORELLI, ROBERTA, POLSINELLI, MARIO, A. BUSSOTTI   +7 more
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Salt tolerance of Azospirillum brasilense.

Acta microbiologica Hungarica, 1986
The effect of various salts on the growth and N2-ase activity of Azospirillum brasilense was tested. Bicarbonate was found to be the most toxic, followed by chlorides and sulphate. Tolerance of A. brasilense to these salts was comparable to that of many species of Rhizobium. SO4-- was stimulatory to growth and N2-ase activity up to 40 meq.
A V, Rao, B, Venkateswarlu
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Cloning of a Streptomyces Endoglucanase Gene in Azospirillum brasilense

1995
The eglS gene from Streptomyces rochei A2, encoding an endoglucanase, was cloned in the conjugative vector pAF700 obtaining the 22.5 kb recombinant plasmid pCSF121. This plasmid was transferred to Escherichia coli DH1 and Azospirillum brasilense Sp6. E. coli [pCSF121] showed no endoglucanase activity, whereas A.
PERITO, BRUNELLA, FANI, RENATO, MASTROMEI, GIORGIO   +2 more
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Chemosensory Responses in Azospirillum brasilense

2006
The ability to swim and navigate the surrounding environment confers an advantage to motile bacteria, allowing the occupation of niches that are optimum for survival and growth. Bacteria are too small to sense their environment spatially, so they must sense the environment temporally by comparing the past and present environments and altering their ...
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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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Analysis of extracellular polysaccharides of Azospirillum brasilense

1991
Bacteria of the genus Azospirillum live in association with the Graminae. Azospirillum has a growth-promoting effect due to nitrogen-fixation, phytohormone production and improved water household of the plant. Azospirillum is able to attach to plant roots (Umali-Garcia et al. 1980) and A. brasilense Sp245 can even invade into the root cortex.
Paul De Troch, Saleela Philip-Hollingsworth, Guy Orgambide, Kris Michiels, Jos Vanderleyden, Frank B. Dazzo   +5 more
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The NIFHDK Operon Of Azospirillum Brasilense Sp7

1985
The transcriptional organization of the nifHDK cluster of Azospirillum was examined by transposon Tn5 mutagenesis, genetic complementation, and product analysis. Tn5 mutagenesis was performed in E. coli on plasmid pAB3, a derivative of pSUP202 in which the nifHDK region was cloned.
B. Perroud, S. K. Bandhari, C. Elmerich
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Osmoregulated Periplasmic Glucans of Azospirillum brasilense

1998
Osmoregulated periplasmic glucans (OPG) are general components of the envelopes of Gram-negative bacteria and share the following features: i) glucose as the sole sugar; ii) localization in the periplasmic space; iii) synthesis under osmotic control and particularly abundant when the medium osmolarity is low.
S. Altabe, P. Talaga, J.-M Wieruszeski, G. Lippens, R. Ugalde, J.-P. Bohin   +5 more
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Influence of Azospirillum Brasilense on Nodulation of Legumes

1988
Combined inoculation of Rhizobium meliloti and Azospirillum brasilense Cd to seedlings of Medicago sativa grown in large petri dishes on sterile agar increased the number of nodules significantly but the effects depended on the concentrations of Azospirillum in the medium.
W. Schmidt, P. Martin, S. H. Omay, F. Bangerth   +3 more
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