MethaneAmmoniaMethylococcaceaeMethylococcus capsulatusOxygenasesEuryarchaeotaArchaeaHydrogenMethylosinus trichosporiumNitrosomonasNitrogenDNA, ArchaealMethylocystaceaeEthaneRumenOxidation-ReductionGeologic SedimentsBacteriaMethanolCarbamoyl-Phosphate Synthase (Ammonia)AnaerobiosisUreaGlutamineHyperammonemiaGlutamate-Ammonia LigaseSoil MicrobiologyAtmosphereMethanosarcinalesAmmonium ChlorideNitrogen RadioisotopesAcetatesLactuloseCarbon DioxideManureRNA, Ribosomal, 16SNitrificationOxidoreductasesFatty Acids, VolatileMicrobial ConsortiaMethanomicrobiaceaeSeawaterHydrogen-Ion ConcentrationMethanosarcinaceaeAnimal FeedFermentationPhylogenyGasesBioreactorsWetlandsMesnaAcetyleneMethanomicrobialesSaturnMethanobacteriaceaeMethylosinusGreenhouse EffectBeijerinckiaceaeFresh WaterSulfatesEthyl EthersDigestionDeltaproteobacteriaTrichloroethyleneMolecular Sequence DataSphagnopsidaBiodegradation, EnvironmentalMethanosarcinaMethylomonasSewageDNA, RibosomalGlutaminaseRNA, ArchaealExtraterrestrial EnvironmentHepatic EncephalopathyButanesAutotrophic ProcessesMethylaminesBacteria, AnaerobicEcosystemNitrosomonas europaeaGlutamate DehydrogenaseBreath TestsMethanobacteriumAmino AcidsSequence Analysis, DNACarbonWater MicrobiologyFormatesHydrocarbonsSoilUranusCattleQuaternary Ammonium CompoundsGenes, ArchaealBeggiatoaGroundwaterAir