ArchaeaArchaeal ProteinsPhylogenyGenes, ArchaealDNA, ArchaealRNA, ArchaealRNA, Ribosomal, 16SGenome, ArchaealDNA, RibosomalMolecular Sequence DataCrenarchaeotaSequence Analysis, DNAGene Expression Regulation, ArchaealBacteriaHaloferax volcaniiMethaneMethanococcusGenes, rRNADNA, BacterialSulfolobusBase CompositionSeawaterMethanobacteriaceaeGeologic SedimentsEuryarchaeotaMethanosarcinaSpecies SpecificityEvolution, MolecularNitrificationHalobacterialesMethanosarcinalesDesulfurococcaceaeMethanobacteriumHaloferaxMethanosarcinaceaePyrococcusRNA, BacterialSulfolobus acidocaldariusBacterial Typing TechniquesPyrococcus abyssiBase SequenceChromosomes, ArchaealAmino Acid SequenceSulfolobus solfataricusSequence AlignmentMethanococcalesWater MicrobiologyArchaeoglobus fulgidusPyrococcus furiosusBiodiversityThermococcusEukaryotic CellsEukaryotaMethanosarcina barkeriActinomycetalesHalobacteriaceaeAmmoniaArchaeal VirusesFatty AcidsSequence Homology, Amino AcidGlyceryl EthersCluster AnalysisBacterial ProteinsThermoplasmaFresh WaterAutotrophic ProcessesSequence Homology, Nucleic AcidGenome, BacterialEcosystemAnaerobiosisThermoproteaceaeGene Transfer, HorizontalProkaryotic CellsHaloferax mediterraneiNucleic Acid HybridizationBiological EvolutionHalobacterium salinarumSodium ChlorideMethanobrevibacterThermoplasmalesDNA, Ribosomal SpacerOxidoreductasesGenes, BacterialAerobiosisPacific OceanTemperatureHot SpringsConserved SequenceMethanomicrobiaceaeOxidation-ReductionModels, MolecularSulfolobalesHaloarcula marismortuiBiotaDeltaproteobacteriaSulfur-Reducing BacteriaEscherichia coliHot TemperatureRNA, RibosomalBioreactors