ProteobacteriaRNA, Ribosomal, 16SPhylogenyBacteriaDNA, RibosomalAlphaproteobacteriaGammaproteobacteriaBetaproteobacteriaDNA, BacterialSequence Analysis, DNAMolecular Sequence DataMetagenomeEpsilonproteobacteriaWater MicrobiologySeawaterSoil MicrobiologyRNA, BacterialActinobacteriaGenes, rRNAFusobacteriaRhodobacterNitrosomonasArchaeaBiodiversityBradyrhizobiaceaeGram-Negative Facultatively Anaerobic RodsGeologic SedimentsDeltaproteobacteriaSulfonium CompoundsBacteroidetesSewageCytophagaBiotaBacteria, AerobicEcosystemMicrobiotaFresh WaterBiodegradation, EnvironmentalBacterial ProteinsMetagenomicsGram-Negative BacteriaGram-Negative Aerobic BacteriaBase SequenceGenes, BacterialGenome, BacterialGram-Negative Aerobic Rods and CocciBase CompositionPlanktonGallionellaceaeMoritellaThiotrichaceaeEnvironmental MicrobiologySymbiosisGram-Negative Chemolithotrophic BacteriaGastrointestinal TractPseudomonadaceaeArctic RegionsAcidobacteriaRhizospherePolymerase Chain ReactionDNA, ArchaealAzoarcusGene Transfer, HorizontalFoot RotWaste Disposal, FluidBioreactorsCaulobacterEvolution, MolecularSulfur-Reducing BacteriaNitrogen FixationWaste ManagementDenaturing Gradient Gel ElectrophoresisBacterial Physiological PhenomenaGene Expression Regulation, BacterialMarine BiologyAerobiosisOxidation-ReductionDysbiosisSequence Homology, Nucleic AcidAmmoniaCrenarchaeotaOxidoreductasesMethylobacteriaceaeThiobacillusSulfur CompoundsBacteriochlorophyllsPetroleumBurkholderiaMicrobial ConsortiaCluster AnalysisAntarctic RegionsAnaerobiosisCulture MediaAcyl-ButyrolactonesFatty AcidsSpecies SpecificityParacoccusFlavobacteriumSphingomonadaceaeAtlantic Ocean