ProteobacteriaRNA, Ribosomal, 16SPhylogenyBacteriaDNA, RibosomalAlphaproteobacteriaGammaproteobacteriaMolecular Sequence DataBetaproteobacteriaDNA, BacterialSequence Analysis, DNAMetagenomeSeawaterEpsilonproteobacteriaWater MicrobiologySoil MicrobiologyBiodiversityRNA, BacterialEcosystemActinobacteriaGenes, rRNAFusobacteriaArchaeaGeologic SedimentsBiotaNitrosomonasRhodobacterFresh WaterBradyrhizobiaceaeDeltaproteobacteriaGram-Negative Facultatively Anaerobic RodsBase SequenceSulfonium CompoundsBacteroidetesMicrobiotaSewageCytophagaMetagenomicsBacteria, AerobicBacterial ProteinsPlanktonBiodegradation, EnvironmentalGenes, BacterialGenome, BacterialGram-Negative BacteriaGram-Negative Aerobic BacteriaBase CompositionGram-Negative Aerobic Rods and CocciSymbiosisPolymerase Chain ReactionEnvironmental MicrobiologyGallionellaceaeMoritellaThiotrichaceaeGastrointestinal TractArctic RegionsDNA, ArchaealRhizosphereGram-Negative Chemolithotrophic BacteriaAcidobacteriaDenaturing Gradient Gel ElectrophoresisPseudomonadaceaeMarine BiologyEvolution, MolecularSpecies SpecificityAtlantic OceanGene Transfer, HorizontalGene Expression Regulation, BacterialBacterial Physiological PhenomenaBioreactorsWaste Disposal, FluidAmmoniaNitrogen FixationAmino Acid SequenceMicrobial ConsortiaAzoarcusCluster AnalysisCrenarchaeotaSulfur-Reducing BacteriaOxidation-ReductionPacific OceanSequence Homology, Nucleic AcidFoot RotOxidoreductasesCaulobacterAerobiosisWaste ManagementAntarctic RegionsGenetic VariationPetroleumDysbiosisCulture MediaMethaneFatty AcidsAnaerobiosisSulfur CompoundsPopulation DensityMediterranean SeaMethylobacteriaceaeThiobacillus