Nitrogen FixationCyanotheceNitrogenaseHerbaspirillumAzospirillumAnabaenaAcetyleneAzotobacter vinelandiiGluconacetobacterCyanobacteriaBurkholderiaSaccharumArabiaNodulariaNitrogenOxidoreductasesMolybdenumDinitrogenase ReductaseAzoarcusMolybdoferredoxinBacterial ProteinsGenes, BacterialAtlantic OceanSoil MicrobiologySeawaterMolecular Sequence DataPhylogenyPlant RootsGene Expression Regulation, BacterialSequence Analysis, DNAPhotosynthesisRNA, Ribosomal, 16SPII Nitrogen Regulatory ProteinsQuaternary Ammonium CompoundsCrops, AgriculturalDNA, BacterialGammaproteobacteriaHydrogenPoaceaeSymbiosisDNA, RibosomalBacteriaGenome, BacterialOryza sativaGenes, rRNACulture MediaMultigene FamilyLightOxygenBase SequencePolymerase Chain ReactionRNA, BacterialMutationAmino Acid SequenceCloning, Molecular