Bacillus thuringiensis: A Common Member of Microflora in Activated Sludges of a Sewage Treatment Plant |
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| Authors: | Eiichi Mizuki Minoru Maeda Rie Tanaka Dae-Weon Lee Miki Hara Tetsuyuki Akao Satoko Yamashita Ho-San Kim Tokio Ichimatsu Michio Ohba |
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| Institution: | (1) Biotechnology & Food Research Institute, Fukuoka Industrial Technology Center, 1465-5 Aikawa, Kurume, Fukuoka 839-0861, Japan, JP;(2) Section of Microbiology, Kyushu Medical Co., Ltd., Kitakyushu, Fukuoka 803-0814. Japan, JP;(3) Graduate School of Agriculture, Kyushu University, Fukuoka 812-8581, Japan, JP |
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| Abstract: | Bacillus thuringiensis was recovered at a high frequency from activated-sludge system environments in an urban sewage-digestive plant. All of the
test materials, sampled at several digesting steps, contained the organism. Of 515 colonies belonging to the B. cereus/B. thuringiensis group, 45 (8.7%) were assigned to B. thuringiensis. The highest density of this bacterium was 1.6 × 103 cfu/ml in a scum sample of the first aeration basin. Among the 45 isolates, 7 were assigned to the known H serovars. Two
isolates of the serovar kenyae isolates exhibited Lepidoptera-specific toxicity. Diptera-specific toxicity was shown by an isolate of serovar israelensis and a serologically undefined isolate. Lectin activity was associated with 12 isolates.
Received: 10 October 2000 / Accepted: 17 November 2001 |
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