DenitrificationHeterotrophic ProcessesBacteriaWater MicrobiologySeawaterNitrous OxideAutotrophic ProcessesSulfonium CompoundsProchlorococcusNitrite ReductasesNitratesRNA, Ribosomal, 16SNitritesSoil MicrobiologyProteobacteriaFresh WaterPhylogenyAnaerobiosisSynechococcusGeologic SedimentsNitrificationDNA, BacterialDNA, RibosomalAlphaproteobacteriaNitrogenThiosulfatesPhytoplanktonMineral WatersMolecular Sequence DataEcosystemCarbon CycleSequence Analysis, DNACulture MediaCytophagaSewageThiobacillusAcetylenePseudomonas stutzeriNitrate ReductaseColony Count, MicrobialRNA, BacterialBacteria, AnaerobicAerobiosisOceans and SeasNitrogen IsotopesAtlantic OceanPseudomonasBiofilmsGram-Negative BacteriaBiodiversityNitrogen CycleWater SupplyGram-Positive BacteriaWater PollutionOxidoreductasesBacterial ProteinsForaminiferaEnterobacteriaceaeWater PurificationNitrate ReductasesRalstonia pickettiiNitrogen CompoundsParacoccus denitrificansBase CompositionGenes, rRNABioreactorsBacteriological TechniquesTemperatureNitrosomonas europaeaOrganic ChemicalsCyanobacteriaOxidation-ReductionMethylophilaceaeGenes, BacterialHydrogen-Ion ConcentrationSoilAlcaligenes faecalisGene Expression Regulation, BacterialNitrogen FixationBiological Oxygen Demand AnalysisAmmoniaAcenaphthenesBiodegradation, EnvironmentalRhodocyclaceaeBetaproteobacteriaQuaternary Ammonium CompoundsRiversWetlandsBacteria, AerobicSeasonsCarbonWaste Disposal, FluidWaste WaterEscherichia coliPondsBradyrhizobiumMethanePseudomonas aeruginosaGenome, BacterialGammaproteobacteria