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由于在不同实验室和重复测定中,都有可能得到不同的 LD_(50) 值,因此作者认为不能把 LD_(50) 看作是生物常数。为了得到关于毒性试验的初步资料,特别是LD_(50) ,没有必要用大量动物,企图“精确”地测定实际上不可能很准确的 LD_(50) 。
Since different values of LD 50 are likely to be obtained in different laboratories and in repeated assays, the authors do not consider LD 50 to be a biological constant. In order to get preliminary information on toxicity tests, especially LD_ (50), it is not necessary to use a large number of animals in an attempt to “accurately” determine LD_ (50) that is practically impossible.