ProteobacteriaRNA, Ribosomal, 16SPhylogenyDNA, RibosomalBacteriaAlphaproteobacteriaDNA, BacterialSequence Analysis, DNAMolecular Sequence DataGammaproteobacteriaBetaproteobacteriaGenes, rRNASeawaterWater MicrobiologyMetagenomeRNA, BacterialEpsilonproteobacteriaActinobacteriaBase CompositionSoil MicrobiologyGeologic SedimentsFusobacteriaBiodiversityRhodobacterNitrosomonasBacteroidetesArchaeaBradyrhizobiaceaeFresh WaterGram-Negative Facultatively Anaerobic RodsDeltaproteobacteriaSewageBase SequenceCytophagaEcosystemSulfonium CompoundsBiotaSpecies SpecificityBacteria, AerobicBacterial ProteinsBiodegradation, EnvironmentalMicrobiotaGenes, BacterialGenome, BacterialGram-Negative Aerobic BacteriaGram-Negative BacteriaFatty AcidsGram-Negative Aerobic Rods and CocciMetagenomicsBacterial Typing TechniquesEnvironmental MicrobiologyPlanktonEvolution, MolecularPolymerase Chain ReactionGallionellaceaeMoritellaGram-Negative Chemolithotrophic BacteriaSequence Homology, Nucleic AcidDNA, ArchaealThiotrichaceaeAerobiosisRhizosphereCluster AnalysisPseudomonadaceaeGastrointestinal TractArctic RegionsSymbiosisNucleic Acid HybridizationGene Transfer, HorizontalAcidobacteriaWaste Disposal, FluidSulfur-Reducing BacteriaNitrogen FixationMarine BiologyBioreactorsCaulobacterAzoarcusAnaerobiosisFoot RotDenaturing Gradient Gel ElectrophoresisBacterial Physiological PhenomenaAntarctic RegionsGenetic VariationPetroleumCulture MediaGene Expression Regulation, BacterialOxidation-ReductionBurkholderiaMethylobacteriaceaeFlavobacteriumOxidoreductasesWaste ManagementSequence AlignmentSulfur CompoundsAmino Acid SequencePacific OceanSphingomonadaceaeCrenarchaeotaAmmoniaDysbiosis