Definitions for bacteroidetes
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The phylum Bacteroidetes is composed of three large classes of Gram-negative, nonsporeforming, anaerobic, and rod-shaped bacteria that are widely distributed in the environment, including in soil, in sediments, sea water and in the guts and on the skin of animals. By far, the ones in the Bacteroidia class are the most well-studied, including the genus Bacteroides, and Porphyromonas, a group of organisms inhabiting the human oral cavity. The class Bacteroidia was formally called Bacteroidetes as it was until recently the only class in the phylum, the name was changed in the fourth volume of Bergey's Manual of Systematic Bacteriology. Members of the genus Bacteroides are opportunistic pathogens. Rarely are members of the other two classes pathogenic to humans. Researcher Jeffrey Gordon and his colleagues found that obese humans and mice had intestinal flora with a lower percentage of Bacteroidetes and relatively more bacteria from the Firmicutes family. However, they are unsure if Bacteroidetes prevent obesity or if these intestinal flora are merely preferentially selected by intestinal conditions in those who are not obese.
U.S. National Library of Medicine
A phylum of bacteria comprised of three classes: Bacteroides, Flavobacteria, and Sphingobacteria.
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"bacteroidetes." Definitions.net. STANDS4 LLC, 2015. Web. 1 Dec. 2015. <http://www.definitions.net/definition/bacteroidetes>.