UV induced mutation breeding of a sp. Kosakonia petroleum degrading strain( S-1) was carried out. Under the condition that the irradiation power was 15 W and the wavelength was 253.7 nm,the optimum mutation time was 140 s,and the positive mutation rate was the highest. A strain Y-16 with genetic stability of mutant Superiority Bacteria was isolated and screened out,compared with starting strain S-1,the oil degradation rate increased 22.64%,also in the range of pH 5-9,the oil degradation rate of Y-16 exceede...
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