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A fibrinolytic enzyme producing strain Bacillus subtilis LD-8 was isolated from douchi, a traditional Chinese soybean-fermented food. After mutagenesis treatments by UV, NTG (N-methyl-N′-nitroso-N-nitroso-guanidine) and γ-radiation, a high fibrinolytic enzyme producing strain B. subtilis LD-8547 was obtained. Under optimum condition, LD-8547 was able to yield the average fibrinolytic activity of 4220 U/mL...
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