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Amphibacillus xylanus
''Amphibacillus xylanus'' or ''A. xylanus'' is a gram-positive-spore forming bacterium with cells 0.3 μm to 0.5 μm in diameter and 0.9 μm to 1.9 μm in length. ''A. xylanus'' is a facultative anaerobic organism which can grow in several different environments. Its success in a multitude of environments stems from multiple metabolic pathways, each with high ATP yields. It is flagellated and motile. It grows best at pH 8.0-10.0 but not at pH 7.0. It is catalase and oxidase negative. This helps to explain better the unique method of metabolism on which the organism relies.〔Niimura, Y., Koh, E., Yanagida, F., Suzuki, K., Komagata, K., & Kozaki, M. (1990). Amphibacillus xylanus gen. nov., sp. nov., a facultatively anaerobic sporeforming xylan-digesting bacterium which lacks cytochrome, quinone, and catalase. International Journal of Systematic Bacteriology, 40(3), 297-301. Retrieved fromhttp://search.proquest.com/docview/15725591?accountid=12154〕
The cells have meso-diaminopimelic acid. The cellular fatty acids consists of iso-branched and anteiso-branched acids and considerable amounts of straight-chain acids. The DNA base composition of these strains ranged from 36 to 38 G+C % (guanine plus cytosine). This in combination with DNA homology determined that ''A. xylanus'' was not related to strains of representative species of the genera bacillus, clostridium, and sporolactobacillus. Considering these and its unique metabolism along with 5S rRNA (ribosomal RNA) sequencing the bacterium is hard to relate to other bacteria in its taxonomic schemes as so little of its genome matched any other bacterium.
==Metabolism==
''A. xylanus'' grows well in alkaline media. It is capable of digesting xylan aerobically and anaerobically. Different reducing agents do not seem to affect it. Under anaerobic conditions the bacterium is a heterofermentator producing ethanol, and formic acid. It will produce acetic acid if maintained in aerobic conditions. Because some of its fermentative products are electrochemically active, ''A. xylanus'' is being researched for use in self-recycling voltaic cells.〔Niimura, Y., Koh, E., Yanagida, F., Suzuki, K., Komagata, K., & Kozaki, M. (1990). Amphibacillus xylanus gen. nov., sp. nov., a facultatively anaerobic sporeforming xylan-digesting bacterium which lacks cytochrome, quinone, and catalase. International Journal of Systematic Bacteriology, 40(3), 297-301. Retrieved fromhttp://search.proquest.com/docview/15725591?accountid=12154〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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