A critical evaluation of the prospects for nitrogen fixation with non-legumes.- Regulation of expression of genes for three nitrogenases in Azotobacter vinelandii.- Genetic characterization of nitrogen fixation in Enterobacter strains from the rhizosphere of cereals.- Analysis of nitrogenase reaction using monoclonal antibodies against -subunit of component I of A. vinelandii.- Involvement of GroEL in Klebsiella pneumoniae nif gene expression and nitrogenase assembly.- The effect of some terrestrial oligochaeta on nitrogenase activity in the soil.- Cassette mutagenesis of a proposed DNA-binding motif in klebsiella pneumoniae rpon (sigma 54).- Characterization of a mutant of Azotobacter chroococcum resistant to some fungicides.- A chromosomal linkage map of Azotobacter vinelandii.- Energy coupling and electron transfer in nitrogenase.- Fluctuation of the ara under elaeagnus angustifolia canopy.- The influence of root exudates on dinitrogen fixation of chosen free-living bacteria.- Soil redox potential in presence of azospirillum.- Biofertilization of maize with free-living nitrogen fixing bacteria: results of field trials on grain production.- Kinetics of kelthane uptake and distribution in azospirillum lipoferum.- Bioaccumulation of the acaricide kelthane (dicofol) by azospirillum lipoferum.- Effect of biofertilizers on controlling fusarium solani f. Sp. phaseoli.- Phyllospheric nitrogen fixing bacteria in tillandsia leaves.- Nif and nod genes in Azospirillum.- Control of nitrogenase in Azospirillum sp..- Biology of nitrogen-fixing bacteria.- Biological nitrogen fixation associated with sugar cane.- Physiological properties of Azospirillum brasilense involved in root growth promotion.- Regulation of the nifHDK genes transcription in Azospirillum brasilense.- Cloning of the nifA and nifB genes of Azospirillum brasilense strain FP2.- Regulation of nitrogen fixation genes in Azospirillum: characterization of A nif regulatory region.- Azospirillum-plant interaction: a biochemical approach.- Osmotollerance of diazotrophic rhizosphere bacteria.- Azospirillum-gramineae interaction: effect of indole-3-acetic acid.- DNA restriction fingerprint for the identification of Azospirilla.- Alteration in membrane potential and in proton efflux in plant roots induced by Azospirillum brasilense.- Effect of soil organic matter on chickpea inoculated with Azospirillum brasilense and Rhizobium leguminosarum bv. ciceri.- Active attachment of Azospirillum brasilense to root surface of non-cereal plants and to sand particles.- Association of Alcaligenes faecalis with wetland rice.- Sunflower inoculation with Azospirillum and other P.G.P.R..- Characterization of a pectinolytic activity in Azospirillum irakense.- Associative N2-fixation in plants growing in saline sodic soils and its relative quantification based on 15N natural abundance.- Genetic analysis of the Azospirillum plant-root interaction.- Dinitrogen fixation and infection of grass leaves by Pseudomonas rubrisubal-bicans and Herbaspirillum seropedicae.- Growth parameters of microaerobic diazotrophic rhizobacteria determined in continuous culture.- Infection of intact roots of kallar grass and rice seedlings by Azoarcus.- Strain-specific salt tolerance and chemotaxis of Azospirillum brasilense and their associative N-fixation with finger millet in saline calcareous soil.- Nitrate reductase activity of Azospirillum brasilense sp7 and sp245 V - and C -forms in continuous culture.- Microcalorimetric study of the growth of Azospirillum brasilense: relation between heat production and other growth parameters.- Nitrogen fixation in P- nodules of wheat roots by introduced free-living diazotrophs.- Firefly luciferase expression on nitrogen fixation with non-legumes.- Nucleotide sequence of regulatory regions of Azospirillum brasilense.- Nucleotide sequence and expression of an Azospirillum nod homologous region.- Isolation and characterization of TN5 induced Azospirillum brasilense mutants alterate...