AmmoniaNitrificationNitrosomonasBetaproteobacteriaBradyrhizobiaceaeGram-Negative Chemolithotrophic BacteriaArchaeaNitrosomonadaceaeOxidation-ReductionMethylococcaceaeMethaneProteobacteriaNitrobacterRNA, Ribosomal, 16SDNA, ArchaealBacteriaSoil MicrobiologyPhylogenyDeltaproteobacteriaAutotrophic ProcessesNitritesOxidoreductasesGallionellaceaeBlack SeaSeawaterGammaproteobacteriaDNA, RibosomalGeologic SedimentsSulfur-Reducing BacteriaChemoautotrophic GrowthSequence Analysis, DNASewageWater MicrobiologySoilEcosystemBiodiversityCrenarchaeotaMolecular Sequence DataFresh WaterDNA, BacterialMethanosarcinalesNitrosomonas europaeaBioreactorsGenes, rRNAArctic RegionsDenaturing Gradient Gel ElectrophoresisGenes, ArchaealSulfurThiosulfatesWaste WaterComamonadaceaeWaste Disposal, FluidNitratesThiobacillusBacterial Physiological PhenomenaBiodegradation, EnvironmentalArsenitesRNA, ArchaealIn Situ Hybridization, FluorescenceSulfatesAnaerobiosisRNA, BacterialFerrous CompoundsCarbon MonoxideSulfidesPolymerase Chain ReactionNitrogenCluster AnalysisCulture MediaHydrogen-Ion ConcentrationTemperatureGenes, BacterialGenetic VariationBacterial ProteinsDNA PrimersBase Sequence