Nitrogen FixationNitrogen IsotopesNitrogen CompoundsNitrogen CycleBlood Urea NitrogenNitrogen DioxideReactive Nitrogen SpeciesNitrogen OxidesPII Nitrogen Regulatory ProteinsCarbonMolecular Sequence DataAmmoniaNitratesFertilizersBacteriaPhylogenyQuaternary Ammonium CompoundsBacterial ProteinsCulture MediaGlutamate-Ammonia LigaseSymbiosisSoilUreaAmino AcidsDNA, BacterialNitrogenaseBase SequenceNitrogen Mustard CompoundsSequence Analysis, DNASpecies SpecificityBiomassAmino Acid SequenceGenes, BacterialGene Expression Regulation, BacterialEscherichia coliAquatic OrganismsMutationEcosystemRNA, Ribosomal, 16SModels, BiologicalPlant RootsSoil MicrobiologyFermentationOrganisms, Genetically ModifiedPlant LeavesGlutamineCyanobacteriaAcetyleneAnti-Bacterial AgentsPhotosynthesisOxidation-ReductionHydrogen-Ion ConcentrationSaccharomyces cerevisiaePlantsWater MicrobiologyTemperatureDNA, RibosomalSeawaterBacteriological TechniquesAnaerobiosisDigestionEukaryotaPhenotypeFungiTime FactorsNitritesPhosphorusFecesGlutamate SynthaseSequence Homology, Amino AcidGenome, BacterialCloning, MolecularAmmonium CompoundsEvolution, MolecularAllantoinSequence AlignmentPoaceaeDenitrificationGene Expression Regulation, FungalRoot Nodules, PlantNitrate ReductaseBiological EvolutionCarbon DioxideKineticsOxidoreductasesMetabolic Networks and PathwaysAnimal FeedRNA, BacterialSulfurKlebsiella pneumoniaeFresh WaterBiodegradation, EnvironmentalArchaeaFungal ProteinsPseudomonasEnergy MetabolismBacteria, AnaerobicKetoglutaric AcidsMedicago sativaMicrobial Sensitivity Tests