本文采用自然选育的方法将实验室保藏的菌种进行复壮纯化处理，得到一株生产水平稳定的菌种，该菌种的产抗水平较原始出发菌种提高了18。
The strain strored in our lab was rejuvenated and purificated by natural screening, the production of the antibiotic was stable and increased by 18.
结论：选择适当的培养基及培养方法摇瓶扩繁蜜环菌后代，再进行选择培养是复壮蜜环菌菌种最简易的方法。
Conclusion: It was the easiest way to rejuvenate A. mellea strain by multiplying the clonal offsprings in a proper medium, together w…
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