MethaneEuryarchaeotaMethanosarcinalesMethanomicrobialesMethanobrevibacterMethanobacterialesMethanosarcinaceaeMethanomicrobiaceaeDNA, ArchaealArchaeaMethanosarcinaRNA, ArchaealRNA, Ribosomal, 16SGenes, ArchaealAntibodies, ArchaealHydrogenAntigens, ArchaealMethanobacteriumBioreactorsFibrobacterAnaerobiosisMethanospirillumPhylogenyDNA, RibosomalSewageDenaturing Gradient Gel ElectrophoresisArchaeal ProteinsBacteria, AnaerobicRumenBiodiversityRuminococcusGenome, ArchaealAcetatesMethanococcusCrenarchaeotaSequence Analysis, DNAMethanococcalesRefuse DisposalGene Expression Regulation, ArchaealMicrobial ConsortiaGeologic SedimentsMolecular Sequence DataBiotaCiliophoraSoil MicrobiologyBacteriaWaste WaterDeanolWaste Disposal, FluidFormatesEnvironmental MicrobiologyBiodegradation, EnvironmentalOxidoreductasesMethanocaldococcusIndustrial WasteMethanolMethanococcaceaeSulfatesMethanosarcina barkeriWater MicrobiologyDeltaproteobacteriaCells, ImmobilizedMesnaFresh WaterThermoplasmaPterinsSulfidesPetroleumCarbon DioxideEcosystemGenes, rRNAWetlandsDNA, BacterialWater Pollution, ChemicalPropionatesRNA, BacterialAcetic AcidCluster AnalysisFermentationMicrobiological TechniquesTemperatureHydrocarbonsIn Situ Hybridization, FluorescenceOxidation-ReductionCulture MediaSheepSeawaterMetagenomeOryza sativaBase SequenceCelluloseBiomassFecesEcologyNitrogen FixationPolymerase Chain ReactionClassificationSpecies SpecificityColony Count, MicrobialDNA Fingerprinting