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Two sesquiterpene lactones, hymenovin and tenulin, were tested for their effect on growth of two strains of Bacillus thuringiensis. Growth of both strains was 98% inhibited by 0.6 mg of tenulin per ml, but only 15 to 20% was inhibited by the same level of hymenovin. Hymenovin appeared to have a mutagenic effect on B. thuringiensis cultures resulting in production of several variant strains. Some of the variant strains had lost their ability to form spores and crystals. Hymenovin also induced B. thuringiensis to produce significant levels of bacteriophage. All variant strains were as susceptible to phage as the parent strain. Although the bactericidal activity of tenulin was two times as great as of hymenovin, tenulin did not appear to have a mutagenic effect on the bacteria.
J O Norman, and
J H Johnson, and
H H Mollenhauer, and
S M Meola
January 1989,
General pharmacology,
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