不同氮源对长白山鸡爪苓菌丝体生长及几种胞外酶活性的影响
불동담원대장백산계조령균사체생장급궤충포외매활성적영향
Effect of different nitrogen sources medium on growth and several kinds of ectoenzyme activity of Polyporus umbellatus hypha in Changbai Mountain
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