Abstract
An asporogenous Bacillus thuringiensis subsp. kurstaki strain IK mutant, strain 290-1, which produced high yields of δ-endotoxin, was obtained by ethyl methane sulfonate treatment of a spore suspension. The mutant strain produced about the same amount of δ-endotoxin as that produced by the parent strain, but 1010 to 1011 cells did not form any detectable dormant spores.
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Selected References
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