Using 2-3 weeks kid abomasums as materials, the ultrasound intensity, extracting time, NaC1 concentration and pH value i......

<正> 引言凝乳酶(Chymosin)是制造干酪时凝固牛乳用的酶制剂,传统方法是将出生10天至30天的小牛屠宰,从其第四胃中用盐浸提出来制......

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