DenitrificationSoil MicrobiologySoilMicrobiologyNitrous OxideNitrite ReductasesNitratesNitritesSoil PollutantsNitrificationNitrogenBacteriaAcetyleneAnaerobiosisPseudomonas stutzeriNitrate ReductaseNitrogen IsotopesNitrogen CycleAerobiosisMicrobiological TechniquesPseudomonasGeologic SedimentsAutotrophic ProcessesRNA, Ribosomal, 16SNitrogen CompoundsOxidoreductasesForaminiferaNitrate ReductasesRalstonia pickettiiParacoccus denitrificansEcosystemWater PurificationBacteria, AnaerobicDNA, BacterialBioreactorsNitrosomonas europaeaPhylogenyWater MicrobiologyBiodegradation, EnvironmentalMethylophilaceaeSequence Analysis, DNAOxidation-ReductionSewageBacteriologyFertilizersAlcaligenes faecalisLaboratories, HospitalAcenaphthenesBiological Oxygen Demand AnalysisDNA, RibosomalWetlandsCarbonLaboratoriesNitrogen FixationMolecular Sequence DataAmmoniaBacteriological TechniquesRhodocyclaceaeFungiRiversBiodiversityBacterial ProteinsQuaternary Ammonium CompoundsCulture MediaOligochaetaProteobacteriaGenes, BacterialSeawaterBetaproteobacteriaBacteria, AerobicWaste WaterManurePondsMethaneBiotaBradyrhizobiumWaste Disposal, FluidBacterial InfectionsAchromobacter cycloclastesSoil Pollutants, RadioactiveMetagenomeFusariumAgricultureGene Expression Regulation, BacterialPseudomonas aeruginosaBeggiatoaArchaeaBiomassNitric OxideFresh WaterAnti-Bacterial AgentsLife Support SystemsLaboratory InfectionMethanolWater Pollutants, ChemicalEcological Systems, ClosedEnvironmental MicrobiologyGenes, rRNAOxygenBaltic States