ProteobacteriaBacteriaRNA, Ribosomal, 16SPhylogenyDNA, RibosomalDNA, BacterialGram-Negative BacteriaMolecular Sequence DataSequence Analysis, DNAAlphaproteobacteriaGammaproteobacteriaGram-Positive BacteriaBetaproteobacteriaWater MicrobiologySeawaterSoil MicrobiologyBacteria, AerobicBacteria, AnaerobicRNA, BacterialMetagenomeBacterial ProteinsGenes, rRNAEpsilonproteobacteriaActinobacteriaGram-Negative Aerobic BacteriaGeologic SedimentsGenes, BacterialArchaeaBiodegradation, EnvironmentalGenome, BacterialBiodiversityNitrosomonasFresh WaterFusobacteriaBase CompositionCytophagaRhodobacterBase SequenceDeltaproteobacteriaBacterial Physiological PhenomenaSymbiosisBacteroidetesGram-Negative Facultatively Anaerobic RodsEscherichia coliBradyrhizobiaceaeSulfur-Reducing BacteriaEcosystemSulfonium CompoundsGene Expression Regulation, BacterialBiotaGram-Negative Aerobic Rods and CocciCulture MediaMicrobiotaGram-Negative Anaerobic BacteriaAnaerobiosisPlanktonColony Count, MicrobialEnvironmental MicrobiologyMetagenomicsSewagePolymerase Chain ReactionAerobiosisSpecies SpecificityGastrointestinal TractAmino Acid SequenceGram-Negative Chemolithotrophic BacteriaGene Transfer, HorizontalOxidation-ReductionThiotrichaceaeMoritellaWaste Disposal, FluidRhizospherePseudomonadaceaeNitrogen FixationPseudomonasGallionellaceaeFatty AcidsBioreactorsAnti-Bacterial AgentsMarine BiologyEvolution, MolecularArctic RegionsBacteroidesOxidoreductasesDenaturing Gradient Gel ElectrophoresisAmmoniaSequence Homology, Nucleic AcidBiofilmsDNA, ArchaealCloning, MolecularFungiFlavobacteriumBurkholderiaBacterial Typing TechniquesCluster AnalysisAcidobacteriaSequence AlignmentPetroleumBacteriochlorophyllsEnterobacteriaceae