Autotrophic ProcessesDenitrificationNitrous OxideNitrite ReductasesNitratesNitritesNitrificationNitrogenAcetylenePseudomonas stutzeriNitrate ReductaseAnaerobiosisNitrogen IsotopesNitrogen CycleAerobiosisForaminiferaGeologic SedimentsPseudomonasOxidoreductasesNitrate ReductasesRalstonia pickettiiNitrogen CompoundsSoil MicrobiologyParacoccus denitrificansBacteriaWater PurificationNitrosomonas europaeaBioreactorsMethylophilaceaeAlcaligenes faecalisBiological Oxygen Demand AnalysisAcenaphthenesOxidation-ReductionSoilRhodocyclaceaeSewageNitrogen FixationAmmoniaWetlandsRiversQuaternary Ammonium CompoundsSeawaterWater MicrobiologyPondsRNA, Ribosomal, 16SEcosystemWaste Water