Nitrogen FixationNitrogenaseSymbiosisAcetyleneRoot Nodules, PlantRhizobiumSinorhizobium melilotiRhizobiaceaeFixation, OcularNitrogen IsotopesLotusAzotobacterGenes, BacterialNitrogen CycleNitrogenMedicago sativaPlant Root NodulationPII Nitrogen Regulatory ProteinsFracture FixationRhizobium leguminosarumRhizobium etliBradyrhizobiumCyanotheceBacterial ProteinsLeghemoglobinAzotobacter vinelandiiKlebsiella pneumoniaePlant RootsCyanobacteriaGene Expression Regulation, BacterialMedicago truncatulaAnabaenaComplement Fixation TestsTissue FixationPhaseolusFabaceaeGlutamate-Ammonia LigaseQuaternary Ammonium CompoundsNitrogen CompoundsMolecular Sequence DataOxidoreductasesAmmoniaDenitrificationCarbonPseudomonas stutzeriMesorhizobiumBlood Urea NitrogenNitrogen DioxideMolybdoferredoxinMolybdenumBone ScrewsCarbon CycleSinorhizobiumDinitrogenase ReductaseGenes, ArchaealNitratesPhotosynthesisGluconacetobacterDNA, BacterialReactive Nitrogen SpeciesBacteriaPhylogenyBone PlatesPeasBase SequenceAzorhizobium caulinodansMutationOperonSoybeansAzospirillum brasilenseIsopteraAchromobacterBiomassSeawaterSesbaniaRhodobacter capsulatusExternal FixatorsFixativesCarbon DioxideSoil MicrobiologyCavesAmino Acid SequenceSequence Analysis, DNAPlant ShootsSoilFrankiaMedicagoHydrogenAzospirillumNitrogen OxidesFracture Fixation, IntramedullaryAlphaproteobacteriaViciaPlasmidsOxidation-ReductionMutagenesis, InsertionalAlnusGenome, BacterialAnaerobiosisAerobiosis