BacteriaNitrogen FixationRNA, Ribosomal, 16SPhylogenyGram-Negative BacteriaGram-Positive BacteriaDNA, RibosomalMolecular Sequence DataDNA, BacterialBacteria, AnaerobicSequence Analysis, DNANitrogen IsotopesNitrogen CompoundsBacterial ProteinsNitrogen CycleNitrogen DioxideBlood Urea NitrogenGenes, rRNABase CompositionBacteria, AerobicSpecies SpecificityWater MicrobiologySeawaterReactive Nitrogen SpeciesEscherichia coliRNA, BacterialBacterial Typing TechniquesGenes, BacterialCulture MediaSymbiosisGene Expression Regulation, BacterialBase SequenceSoil MicrobiologyAmmoniaGram-Negative Aerobic BacteriaNitratesNitrogen OxidesFatty AcidsCarbonGram-Negative Anaerobic BacteriaPII Nitrogen Regulatory ProteinsAnaerobiosisBacterial Physiological PhenomenaGeologic SedimentsFresh WaterAnti-Bacterial AgentsActinomycetalesAmino Acid SequenceBiodegradation, EnvironmentalGenome, BacterialAerobiosisSulfur-Reducing BacteriaGammaproteobacteriaColony Count, MicrobialFertilizersQuaternary Ammonium CompoundsPseudomonasEnterobacteriaceaeSoilFermentationEcosystemHydrogen-Ion ConcentrationOxidation-ReductionNucleic Acid HybridizationTemperaturePhenotypeBetaproteobacteriaPlant RootsAmino AcidsBacteriological TechniquesFungiPolymerase Chain ReactionGlutamate-Ammonia LigaseBacteroidesFecesBacterial AdhesionMutationCluster AnalysisSodium ChlorideBiomassSequence Homology, Nucleic AcidSulfurCloning, MolecularBacteroidetesBiodiversityBiofilmsNitrogenaseMicrobial Sensitivity TestsCytophagaProteobacteriaActinobacteriaSequence AlignmentUreaPigments, BiologicalPlant LeavesSequence Homology, Amino AcidEvolution, MolecularOxidoreductasesBacterial InfectionsArchaea