The Firmicutes (Latin: firmus, strong, and cutis, skin, referring to the cell wall) are a phylum of bacteria, most of which have Gram-positive cell wall structure. A few, however, such as Megasphaera, Pectinatus, Selenomonas and Zymophilus, have a porous pseudo-outer-membrane that causes them to stain Gram-negative. Scientists once classified the ...
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http://en.wikipedia.org/wiki/Firmicutes
(from the article `bacteria`) ...order Prochlorales; gliding or nonmotile forms. Most cyanobacteria are photoautotrophs and can fix dinitrogen gas. Often form long cell ...
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http://www.britannica.com/eb/a-z/f/28
(fәr-mik´u-tēz) (fur″mĭ-ku´tēz) a phylum of mainly gram-positive bacteria; with Bacteroidetes, it is one of the two main groups making up the intestinal flora.
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http://www.encyclo.co.uk/local/21001
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