The most virulent strain was screened out after evaluated by the indices of mortality, infection rate and the median lethal time (LT50).
以桃蚜的校正死亡率、感染率及致死中时(LT_(50))为指标综合评价不同菌株毒力。
·2,447,543篇论文数据，部分数据来源于NoteExpress
通过实验发现：当土壤中重金属的含量为0.5%时，最符合蚯蚓的半数致死量。
Through experiments have found that: when the concentration of heavy metals in the soil is 0.5 percentages, it fits the half lethal dose.
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