ProteobacteriaRNA, Ribosomal, 16SPhylogenyBacteriaDNA, RibosomalAlphaproteobacteriaMolecular Sequence DataGammaproteobacteriaDNA, BacterialSequence Analysis, DNABetaproteobacteriaMetagenomeEpsilonproteobacteriaWater MicrobiologySeawaterSoil MicrobiologyGenes, rRNARNA, BacterialActinobacteriaFusobacteriaBase SequenceRhodobacterNitrosomonasArchaeaBiodiversityGeologic SedimentsBradyrhizobiaceaeGram-Negative Facultatively Anaerobic RodsDeltaproteobacteriaSulfonium CompoundsBacteroidetesBacterial ProteinsSewageCytophagaBiotaBacteria, AerobicEcosystemFresh WaterMicrobiotaBiodegradation, EnvironmentalBase CompositionAmino Acid SequenceGenes, BacterialMetagenomicsGram-Negative BacteriaGenome, BacterialGram-Negative Aerobic BacteriaGram-Negative Aerobic Rods and CocciPlanktonGallionellaceaeMoritellaEnvironmental MicrobiologyThiotrichaceaePolymerase Chain ReactionSymbiosisGram-Negative Chemolithotrophic BacteriaGastrointestinal TractEvolution, MolecularPseudomonadaceaeArctic RegionsDNA, ArchaealSequence Homology, Nucleic AcidSequence AlignmentAcidobacteriaSequence Homology, Amino AcidRhizosphereCloning, MolecularGene Transfer, HorizontalAzoarcusGene Expression Regulation, BacterialMultigene FamilyWaste Disposal, FluidBioreactorsSulfur-Reducing BacteriaFoot RotNitrogen FixationCaulobacterAerobiosisBacterial Physiological PhenomenaSpecies SpecificityDenaturing Gradient Gel ElectrophoresisWaste ManagementOxidation-ReductionMarine BiologyOxidoreductasesCluster AnalysisAmmoniaCrenarchaeotaFatty AcidsDysbiosisMethylobacteriaceaeThiobacillusCulture MediaPetroleumAnaerobiosisBurkholderiaSulfur CompoundsMicrobial ConsortiaBacteriochlorophyllsAntarctic Regions