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Medical Definition of Aquaspirillum
1. A genus of motile, nonsporeforming, aerobic bacteria (family Spirillaceae) containing Gram-negative, rigid, helical or helically curved cells which are 0.2 to 1.5 um in diameter. Motile cells contain fascicles of flagella at one or both poles. Some species can grow anaerobically with nitrate instead of oxygen as the terminal electron acceptor. These organisms are chemoorganotrophic, possessing a strictly respiratory metabolism. They do not ferment carbohydrates; a few species can oxidise a limited variety of carbohydrates. The habitat of these organisms is fresh water. The type species is Aquaspirillum serpens. Origin: L. Aqua, water, + spirillum, coil (05 Mar 2000)