Nitrogen FixationCarbonNitrogenaseSymbiosisAcetyleneRoot Nodules, PlantRhizobiumSinorhizobium melilotiCarbon DioxideRhizobiaceaeNitrogenNitrogen IsotopesGenes, BacterialFixation, OcularLotusAzotobacterNitrogen CycleMedicago sativaPII Nitrogen Regulatory ProteinsPlant Root NodulationCarbon MonoxideBacterial ProteinsRhizobium leguminosarumFracture FixationRhizobium etliBradyrhizobiumCyanotheceLeghemoglobinNanotubes, CarbonPlant RootsAzotobacter vinelandiiGene Expression Regulation, BacterialKlebsiella pneumoniaeCyanobacteriaMedicago truncatulaAnabaenaPhaseolusMolecular Sequence DataComplement Fixation TestsTissue FixationQuaternary Ammonium CompoundsGlutamate-Ammonia LigaseFabaceaeOxidoreductasesNitrogen CompoundsAmmoniaDenitrificationNitrogen DioxidePseudomonas stutzeriMesorhizobiumBlood Urea NitrogenPhotosynthesisNitratesBiomassMolybdenumMolybdoferredoxinCarbon CycleBone ScrewsBacteriaSinorhizobiumCarbon IsotopesDinitrogenase ReductaseGenes, ArchaealDNA, BacterialPhylogenyCarbon Monoxide PoisoningBase SequenceMutationSeawaterGluconacetobacterReactive Nitrogen SpeciesSoilOperonPeasBone PlatesSoybeansSoil MicrobiologyAzorhizobium caulinodansAzospirillum brasilenseIsopteraAchromobacterOxidation-ReductionRhodobacter capsulatusHydrogenSequence Analysis, DNASesbaniaAmino Acid SequenceAnaerobiosisAerobiosisExternal FixatorsOxygenFixativesPlant ShootsCavesAlphaproteobacteriaPlasmidsNitrogen OxidesCulture MediaFrankiaMutagenesis, Insertional