medium lethal dose (ld50) meaning in English

半数致死量

The medium lethal dose ( ld50 ) of rat is more than 5000mg / kg , which showed that the powder is toxicological harmless . the toxicological test confirmed that the powder did not irritant to the skin and eyes of rabbit . 5 ) the structure and properties of this anti - bacterial powder the powder " properti properties , stdi as high t ~ i ~ aure resimarinate stability , were tested
5 ）抗菌粉体的性能测试与分析采用bet 、 sem 、 xrd 、 xps等手段分析了粉体结构与抗菌性能的关系，发现了当银元素以离子状态存在时，具有良好的杀菌作用，当银元素以单质状态存在时，杀菌效果不显著。