| porphyromonas | A genus of gram-negative, anaerobic, nonsporeforming, nonmotile rods or coccobacilli. Organisms in this genus had originally been classified as members of the bacteroides genus but overwhelming biochemical and chemical findings indicated the need to separate them from other bacteroides species, and hence, this new genus was created. (12 Dec 1998) |
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| porphyromonas gingivalis | A species of gram-negative, anaerobic, rod-shaped bacteria originally classified within the bacteroides genus. This bacterium produces a cell-bound, oxygen-sensitive collagenase and is isolated from the human mouth. (12 Dec 1998) |