Nitrogen FixationNitrogenaseOxidoreductasesMolybdoferredoxinAzotobacter vinelandiiDinitrogenase ReductaseGenes, BacterialMimosaAnabaena variabilisPhylogenyCyanobacteriaRhizobiumKlebsiella pneumoniaeSoil MicrobiologySymbiosisProteobacteriaDNA, BacterialRhizobiaceaeAlphaproteobacteriaIron CompoundsPaenibacillusBacterial ProteinsAzotobacterMolecular Sequence DataAcetyleneRNA, Ribosomal, 16SCombretaceaeSequence Analysis, DNABradyrhizobiumFrankiaGammaproteobacteriaAzospirillumCape VerdeFabaceaePotassium AcetateBeijerinckiaceaeRhizophoraceaeAtlantic OceanAzoarcusEctothiorhodospiraceaePacific OceanCupriavidusSeawaterRhizosphereAvicenniaHerbaspirillumBacteriaDNA, RibosomalMethanococcaceaeRoot Nodules, PlantBase SequenceSinorhizobiumBacillaceaeMolybdenumAnabaenaPlant RootsCicerDNA, ArchaealPII Nitrogen Regulatory ProteinsBurkholderiaPlanktonGene Expression Regulation, BacterialCloning, MolecularPolymerase Chain ReactionArchaeaAzospirillum brasilenseMethanosarcina barkeriGenes, rRNASinorhizobium melilotiWater MicrobiologyAmino Acid SequenceDenaturing Gradient Gel ElectrophoresisOperonNitrogenPolymorphism, Restriction Fragment LengthEcosystemSequence HomologyGenes, ArchaealMedicago sativaSoilRNA, BacterialBiodiversityBiotaClostridiumArchaeal ProteinsMethaneMethanococcusMethylococcaceaeIsopteraUtahGeologic SedimentsPlasmidsNucleic Acid HybridizationFungicides, IndustrialPromoter Regions, GeneticBase CompositionPlants, MedicinalQuaternary Ammonium CompoundsTranscription, GeneticGenes