Bacillus thuringiensis: a common member of microflora in activated sludges of a sewage treatment plant.
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 x 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.
Mizuki
E
E
Biotechnology & Food Research Institute, Fukuoka Industrial Technology Center, 1465-5 Aikawa, Kurume, Fukuoka 839-0861, Japan. emizuki@fitc.pref.fukuoka.jp
Maeda
M
M
Tanaka
R
R
Lee
D W
DW
Hara
M
M
Akao
T
T
Yamashita
S
S
Kim
H S
HS
Ichimatsu
T
T
Ohba
M
M
D000818:Animals; D001413:Bacillus thuringiensis / Q000276:immunology / Q000302:isolation & purification* / Q000648:ultrastructure; D015169:Colony Count, Microbial / Q000379:methods; D007814:Larva / Q000382:microbiology; D012703:Serotyping; D012722:Sewage / Q000382:microbiology*; D014871:Water Microbiology; D018508:Water Purification
D012722:Sewage