Sinorhizobium melilotiNitrogen FixationRhizobiumSinorhizobiumSymbiosisRoot Nodules, PlantMedicago sativaLotusMedicago truncatulaFabaceaeBacteriaRhizobium leguminosarumBacterial ProteinsSinorhizobium frediiRhizobium etliNitrogenaseRhizobiaceaePlant Root NodulationGenes, BacterialMolecular Sequence DataGene Expression Regulation, BacterialAcetylenePlant RootsDNA, BacterialMedicagoBradyrhizobiumRhizobium tropiciPhylogenyGram-Negative BacteriaRNA, Ribosomal, 16SGram-Positive BacteriaNitrogen IsotopesSequence Analysis, DNANitrogen CyclePhaseolusPII Nitrogen Regulatory ProteinsSoil MicrobiologyPlants, MedicinalBacteria, AnaerobicNitrogenBase SequenceMutationEscherichia coliGenome, BacterialNitrogen CompoundsAmino Acid SequenceDNA, RibosomalPlasmidsCarbonPolysaccharides, BacterialSoybeansAzotobacterLeghemoglobinNitrogen DioxideBlood Urea NitrogenOperonSpecies SpecificityMesorhizobiumMutagenesis, InsertionalKlebsiella pneumoniaeFixation, OcularCulture MediaGlutamate-Ammonia LigaseGenetic Complementation TestOxidoreductasesAmmoniaRNA, BacterialQuaternary Ammonium CompoundsCloning, MolecularPhenotypeBacteria, AerobicSeawaterNitratesCyanobacteriaSesbaniaCyanotheceFracture FixationReactive Nitrogen SpeciesSequence Homology, Amino AcidWater MicrobiologyDNA Transposable ElementsAzotobacter vinelandiiAnaerobiosisGram-Negative Aerobic BacteriaProteobacteriaAlphaproteobacteriaPeasPlantsAerobiosisOxidation-ReductionDenitrificationMultigene FamilyMelilotusAnabaenaComplement Fixation TestsDicarboxylic AcidsTissue FixationSoilNitrogen OxidesChromosomes, Bacterial