in vivo view of the chemoheterotrophic bacterium Spirillum volutans (EHRENBERG,1832). Tufts of flagella occur at both poles. The species name derives from the term "volutin" or metachromatic granules composed of polyphosphates.However, the granules of S. volutans are,in fact,composed of the energy reserve compound,poly-β-hydroxybutyrate and do not contain polyphosphates.Collected from a putifying raw culture from a freshwater pond near Boise,Idaho.Phase contrast. This image was taken by William Bourland. He now uses a Zeiss Axioskop 2 with Spot Insight and Spot Flex CCD cameras (Diagnostic Instruments). Image copyright: William Bourland, image used under license to MBL (micro*scope).
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From the collection
Freshwater and Terrestrial Microbes of Idaho (USA) and Elsewhere
|Description of Spirillum volutans: Spirillum volutans (EHRENBERG,1832).Helical shape.Gram negative.Chemoorganotrophic.Microaerophilic.Strictly respiratory metabolism.
Bipolar tufts of flagella.Contains poly-beta-hydroxybutyrate granules.Does not oxidize or ferment carbohydrate.Does not hydrolyze casein,starch or hippurate.Freshwater habitat.