title: A phylogenetic analysis of Aquifex pyrophilus.
abstract: The 16S rRNA of the bacterion Aquifex pyrophilus, a microaerophilic, oxygen-reducing hyperthermophile, has been sequenced directly from the the PCR amplified gene.  Phylogenetic analyses show the Aq. pyrophilus lineage to be probably the deepest (earliest) in the (eu)bacterial tree.  The addition of this deep branching to the bacterial tree further supports the argument that the Bacteria are of thermophilic ancestry.
authors.affiliation: Institut für Biochemie, Genetik und Mikrobiologie, Universität Regensburg, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Burggraf
authors.forename: G J
authors.initials: GJ
authors.lastname: Olsen
authors.forename: K O
authors.initials: KO
authors.lastname: Stetter
authors.forename: C R
authors.initials: CR
authors.lastname: Woese
mesh_terms: D001105:Archaea / Q000145:classification* / Q000235:genetics; D001419:Bacteria / Q000145:classification* / Q000235:genetics; D001483:Base Sequence; D005075:Biological Evolution; D006358:Hot Temperature; D008386:Marine Biology; D008969:Molecular Sequence Data; D009711:Nucleotides; D010802:Phylogeny; D012329:RNA, Bacterial / Q000737:chemistry / Q000145:classification / Q000235:genetics*; D012336:RNA, Ribosomal, 16S / Q000737:chemistry / Q000145:classification / Q000235:genetics*; D012689:Sequence Homology, Nucleic Acid; D014871:Water Microbiology
chemical_list: D009711:Nucleotides; D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S