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Picrophilus
In taxonomy, ''Picrophilus'' is an archaean genus of the family Picrophilaceae.〔See the NCBI (webpage on Picrophilus ). Data extracted from the (【引用サイトリンク】 title=NCBI taxonomy resources )〕 ''Picrophilus'' is an extremely acidophilic genus within Euryarchaeota. These microbes are the most acidophilic organisms currently known,〔C.Michael Hogan. 2010. (''Extremophile'' ). eds. E.Monosson and C.Cleveland. Encyclopedia of Earth. National Council for Science and the Environment, Washington DC.〕 with the ability to grow at a pH of -0.06.〔(Life in the Universe: Expectations and Constraints )〕 They are obligate acidophiles and are unable to maintain their membrane integrity at pH values higher than 4. While phylogenetically related to other organisms within Thermoplasmata, unlike ''Thermoplasma'' and ''Ferroplasma'', ''Picrophilus'' contains an S-layer cell wall. ==References==
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