ProteobacteriaRNA, Ribosomal, 16SPhylogenyBacteriaDNA, RibosomalAlphaproteobacteriaGammaproteobacteriaBetaproteobacteriaDNA, BacterialMolecular Sequence DataSequence Analysis, DNAMetagenomeEpsilonproteobacteriaWater MicrobiologySeawaterSoil MicrobiologyRNA, BacterialActinobacteriaGenes, rRNABiodiversityFusobacteriaArchaeaEcosystemNitrosomonasRhodobacterGeologic SedimentsBradyrhizobiaceaeBiotaGram-Negative Facultatively Anaerobic RodsDeltaproteobacteriaSulfonium CompoundsBacteroidetesSewageFresh WaterCytophagaMicrobiotaBacteria, AerobicBase SequenceMetagenomicsBacterial ProteinsBiodegradation, EnvironmentalPlanktonGenes, BacterialGenome, BacterialGram-Negative BacteriaGram-Negative Aerobic BacteriaBase CompositionGram-Negative Aerobic Rods and CocciGallionellaceaeMoritellaEnvironmental MicrobiologySymbiosisThiotrichaceaePolymerase Chain ReactionGastrointestinal TractGram-Negative Chemolithotrophic BacteriaArctic RegionsDNA, ArchaealRhizospherePseudomonadaceaeAcidobacteriaGene Transfer, HorizontalDenaturing Gradient Gel ElectrophoresisEvolution, MolecularAzoarcusBioreactorsWaste Disposal, FluidMarine BiologyNitrogen FixationSulfur-Reducing BacteriaFoot RotBacterial Physiological PhenomenaGene Expression Regulation, BacterialCaulobacterAmmoniaOxidation-ReductionCrenarchaeotaWaste ManagementSequence Homology, Nucleic AcidAerobiosisSpecies SpecificityMicrobial ConsortiaCluster AnalysisOxidoreductasesAtlantic OceanDysbiosisAmino Acid SequencePacific OceanAntarctic RegionsMethylobacteriaceaePetroleumSulfur CompoundsThiobacillusCulture MediaAnaerobiosisFatty AcidsBacteriochlorophyllsBurkholderiaMethaneGenetic Variation