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The Deinococcus-Thermus are a small group of bacteria that are highly resistant to environmental hazards. There are two main groups. * The Deinococcales include two families, with three genera, ''Deinococcus'' and ''Truepera'', the former with several species that are resistant to radiation; they have become famous for their ability to eat nuclear waste and other toxic materials, survive in the vacuum of space and survive extremes of heat and cold. * The Thermales include several genera resistant to heat (''Marinithermus'', ''Meiothermus'', ''Oceanithermus'', ''Thermus'', ''Vulcanithermus'').〔http://www.bacterio.cict.fr/classifphyla.html#DeinococcusThermus〕 ''Thermus aquaticus'' was important in the development of the polymerase chain reaction where repeated cycles of heating DNA to near boiling make it advantageous to use a thermo-stable DNA polymerase enzyme. Though these two groups evolved from a common ancestor, the two mechanisms of resistance appear to be largely independent. These bacteria have thick cell walls that give them gram-positive stains, but they include a second membrane and so are closer in structure to those of gram-negative bacteria. Cavalier-Smith calls this clade Hadobacteria (from Hades, the Greek underworld). ==Phylogeny== The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN) and National Center for Biotechnology Information (NCBI) and the phylogeny is based on 16S rRNA-based LTP release 111 by 'The All-Species Living Tree' Project 〔'The All-Species Living Tree' Project.(【引用サイトリンク】 title=16S rRNA-based LTP release 111 (full tree) )〕 }} }} |label2=Deinococcales |2= }} Note: ♠ Strains found at the National Center for Biotechnology Information (NCBI) but not listed in the List of Prokaryotic names with Standing in Nomenclature (LSPN) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Deinococcus-Thermus」の詳細全文を読む スポンサード リンク
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