MethanobrevibacterMethanobacteriaceaeMethaneEuryarchaeotaAntibodies, ArchaealMethanomicrobiaceaeAntigens, ArchaealMethanobacterialesDNA, ArchaealSodium IonophoresArchaeaRumenGeeseFormatesRNA, Ribosomal, 16SWaste Disposal, FluidCiliophoraDNA, RibosomalIndustrial WasteGenes, ArchaealBioreactorsGastrointestinal TractPhylogenySequence Analysis, DNABiodiversityFeces