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To obtain amino acid-analogue-resistant mutants the wild strain A9 of Arthrospira platensis was mutated by ethylmethane sulfonate (EMS). Mutagenic effects of strain A9 by EMS were studied. The experimental results indicated that the survival rate curve of strain A9 took a typical “exponential shape” with lethal dosage of EMS being 1 %. The survival of A9 strain was 13.2 % when treated with 0.4 % of...
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