
Methanosarcina is a genus of euryarchaeote archaea that produce methane. These single-celled organisms are the only known anaerobic methanogens that produce methane using all three metabolic pathways for methanogenesis. They live in diverse environments where they can remain safe from the effects of oxygen, whether on the earth`s surface, in grou....
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http://en.wikipedia.org/wiki/Methanosarcina

A genus of anaerobic, irregular spheroid-shaped methanosarcinales whose organisms are nonmotile. Endospores are not formed. These archaea derive energy via formation of methane from acetate, methanol, mono-, di-, and trimethylamine, and possibly, carbon monoxide. Organisms are isolated from freshwater and marine environments. ... (12 Dec 1998) ... ...
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http://www.encyclo.co.uk/local/20973
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