RumenMethaneMethanobrevibacterMethanomicrobiaceaeEuryarchaeotaMethanomicrobialesMethanosarcinalesDNA, ArchaealMethanobacterialesMethanococcusMethanobacteriaceaeMethanobacteriumSwimming PoolsMethanospirillumRNA, Ribosomal, 16SArchaeaHydrogenTrichostomatidaGenes, ArchaealDNA, RibosomalArchaeal ProteinsFibrobacterPhylogenyBiotaAnaerobiosisFermentationFormatesGene Expression Regulation, ArchaealRNA, ArchaealBacteriaCiliophoraCattleOil and Gas FieldsMolecular Sequence DataSequence Analysis, DNAMethanosarcina barkeriAcetatesBioreactorsFatty Acids, VolatileGlyceryl EthersOxidoreductasesSheepReticulumAnimal FeedMethanolPropionatesThermosomesFormate DehydrogenasesWaste Disposal, FluidRuminantsGeologic SedimentsSulfidesBase CompositionGenome, ArchaealDigestionSoil MicrobiologyMethanococcalesAcetic AcidAbomasumEukaryotaMethylaminesBiodiversityCulture MediaGenes, rRNARefuse DisposalIndustrial WasteStomach, RuminantSilageCluster AnalysisNitrogenHydrogen-Ion ConcentrationGene PoolDNA, BacterialEnvironmental MicrobiologyPoaceaeRuminococcusAnimal Nutritional Physiological PhenomenaCelluloseSeawaterOmasumCarbon DioxideAmmoniaGastrointestinal ContentsButyrivibrioBase SequenceWater MicrobiologyMedicago sativaPeptococcaceaeRNA, BacterialSodium ChlorideDietGram-Negative Anaerobic BacteriaMonensinTemperatureHot TemperatureSpecies SpecificityBacteroidesEubacteriumOxidation-ReductionKinetics