飲料用タンク水から高頻度に分離されたProtomonas extorquensの消長と塩素抵抗性

概要

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We detected some heterotrophic bacteria from drinking tank-water by using standard agar medium cultured for 7 days at 25℃. Bacteria produced pink water-insoluble pigment were isolated most frequently. These isolates were polar monotrichous gram-negative rod and vacuolated. They produced weakly urease, oxidase and catalase. They utilized D-arabinose, galactose, methanol, ethanol and glycerol as carbon sources. They contained a large amount of unsaturated straight-chain fatty acid C_<18 : 1>. The G+C ratio of DNA base composition ranged from 65.8 to 66.3. The isolates were identified as Protomonas extorquens. Good growth of these bacteria were observed at 30℃, and between pH5.0 and 9.0 by incubation of sterilized drinking water in tank. Growth was not observed in the presence of 1.5% sodium chloride. The generation-times of P. extorquens were determined by duplicate experiments about 5.4h. They have been survived for a long period (250 days) in tank-water. The resistance of P. extorquens to free residual chlorine was very high. The exposure time to kill completely 10^5 cfu・ml^<-1> in 1.0 mg・l<-1> of free residual chlorine was 10 minutes. P. extorquens is worthy of notice as unknown pathogens for men and source of nosocomial infection.
日本微生物生態学会の論文
1989-07-01