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strain degeneration
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strain degeneration
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strain degeneration
菌种退化
菌种培养或菌种保藏过程中,因微生物群体中的个别个体发生自发突变导致该物种原有的优良生产性状衰退甚至丧失的现象。
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geographic distribution of cardiovascular and cerebrovascular diseases
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geographic distribution of diseases related to the lack of food and poor nutrition
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