Nitrogen FixationNitrogenaseSymbiosisAcetyleneRoot Nodules, PlantNitrogen IsotopesNitrogen CycleRhizobiumSinorhizobium melilotiRhizobiaceaePII Nitrogen Regulatory ProteinsNitrogen CompoundsBlood Urea NitrogenNitrogen DioxideGenes, BacterialAzotobacterLotusFixation, OcularMedicago sativaPlant Root NodulationNitrogenBacterial ProteinsRhizobium leguminosarumRhizobium etliBradyrhizobiumFracture FixationCyanothecePlant RootsReactive Nitrogen SpeciesLeghemoglobinAmmoniaCyanobacteriaKlebsiella pneumoniaeGene Expression Regulation, BacterialGlutamate-Ammonia LigaseQuaternary Ammonium CompoundsAzotobacter vinelandiiCarbonMedicago truncatulaNitratesPhaseolusMolecular Sequence DataFabaceaeAnabaenaComplement Fixation TestsTissue FixationDenitrificationOxidoreductasesNitrogen OxidesPseudomonas stutzeriMesorhizobiumPhotosynthesisCarbon CycleMolybdenumBiomassSinorhizobiumBacteriaGenes, ArchaealSoilFertilizersMolybdoferredoxinBone ScrewsDNA, BacterialDinitrogenase ReductaseBase SequencePhylogenyMutationSoybeansGluconacetobacterPeasOperonSeawaterCarbon DioxideAzospirillum brasilenseAzorhizobium caulinodansAchromobacterSoil MicrobiologyBone PlatesIsopteraAmino AcidsPlant ShootsRhodobacter capsulatusOxidation-ReductionAmino Acid SequenceGlutamate SynthaseSesbaniaSequence Analysis, DNAFrankiaHydrogenCavesExternal FixatorsFixativesAnaerobiosisKetoglutaric AcidsMedicagoAerobiosisViciaNitrificationPlasmidsAlphaproteobacteria