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Since its first description by Ferdinand Cohn 136 years ago, C. polyspora has been known formass developments in drinking water systems and affecting the drinking water quality. SinceC. polyspora has never been cultured, its phylogenetic affiliation and physiological propertiesremained a secret until molecular methods revealed it to be a gammaproteobacterial methaneoxidizer with a phylogenetically very unusual particulate methane monooxygenase (Stoeckeret al, 2006). The results from molecular studies were supported by physiological experimentsconducted with physically enriched biomass of C. polyspora from a drinking water treatmentplant. The C. polyspora enrichment oxidized methane with concomitant decrease of oxygenand an increase of carbon dioxide. The methane oxidation rate at the temperature optimum of20C followed a Michaelis Menten kinetic with a Vsubmax/sub of 1,548¿¿¿¿29 mol CHsub4/sub hsup-1/sup [gsubdw biomass/sub]sup-1/supand a Ksubm/sub of 3,901¿¿¿¿348 ppmv of methane. Thus, C. polyspora can be considered a low-affinitymethane oxidizing bacterium. Includes 11 references.

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Edition: Vol. - No. Published: 11/01/2006 Number of Pages: 5File Size: 1 file , 480 KB