EubacteriumArchaeaArchaeal ProteinsGenes, ArchaealBacteriaDNA, ArchaealRNA, ArchaealGenome, ArchaealPhylogenyMolecular Sequence DataCrenarchaeotaRNA, Ribosomal, 16SGram-Positive Asporogenous RodsMethanococcusGram-Negative Anaerobic BacteriaSulfolobusGene Expression Regulation, ArchaealAmino Acid SequenceHaloferax volcaniiPeptostreptococcusBacteria, AnaerobicEuryarchaeotaMethaneBase SequenceDNA, RibosomalBacterial ProteinsSequence Homology, Amino AcidDNA, BacterialGenes, BacterialRNA, BacterialMethanobacteriaceaeEvolution, MolecularEscherichia coliSequence AlignmentHalobacteriumProkaryotic CellsHydroxysteroid DehydrogenasesSequence Analysis, DNAAnaerobiosisFusobacteriumMethanosarcinaNitrificationHalobacteriaceaeThermotoga maritimaGenes, rRNAMethanobacteriumEukaryotaDesulfurococcaceaeMethanosarcinalesCloning, MolecularHalobacterialesThermus thermophilusHaloferaxThermoplasmaPyrococcusClostridiumSulfolobus acidocaldariusMethanosarcinaceaePyrococcus abyssiHaloarcula marismortuiGenome, BacterialSpecies SpecificitySeawaterOxidoreductasesBase CompositionChromosomes, ArchaealSulfolobus solfataricusGeologic SedimentsMethanococcalesHot TemperatureArchaeoglobus fulgidusPyrococcus furiosusGram-Positive RodsProteobacteriaNucleic Acid ConformationBiological EvolutionThermococcusRNA, TransferFecesModels, MolecularEukaryotic CellsMethanosarcina barkeriSequence Homology, Nucleic AcidGene Transfer, HorizontalPeriodontal PocketSubstrate SpecificityRNA, RibosomalBacterial Physiological PhenomenaAmmoniaBacteroidesConserved SequenceArchaeal VirusesGram-Positive BacteriaCytophagaGlyceryl EthersThermus