半数致死量是推荐临床剂量的几百倍。
And half lethal dose was several hundred folds than the clinical dose.
方法：选用昆明种小鼠测定药物的半数致死量；
位列肺癌之后，乳腺癌在妇女的癌致死量中排第二位。
After lung cancer, breast cancer is the second leading cause of cancer death in women.
目的：利用寇氏法测定彼得异蝎蝎毒腹腔注射对小鼠的半致死量。
[Methods] The LD_(50) of WESCC in mice was assayed with improved karbers method.
结果小鼠双氯芬酸钠胶浆直肠注药半数致死量(LD50)为399。
Results The LD50 of diclofenac mucilage (contained in enema for mice) was 399.
结论：以亚致死量H2O2处理年轻2BS细胞可以建立细胞衰老模型。
Conclusion:Senescent cell model could be established by 2BS treated with sub-lethal H2O2.
在通风不良的环境下，普通壁纸释放的CO 达到致死量只需6分钟。
During the badly ventilation, CO volume of normal PVC wallpaper only take 6 minutes to hitlethal equivalent.
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.
免疫的家兔及豚鼠都能抵抗CVS病毒致死量的脑内或肌肉内的攻击而免发狂犬病。
All of the rabbits and guinea-pigs vaccinated could resist intracerebral (ic) or intramuscular (im) challenge with lethal dose of CVS strain.
采用较低的细胞密度铺板，加入含最小致死量G418的DMEM培养基进行再次筛选；
The cells were planked with lower cell density, and further screened in DMEM medium containing G418 MFD;
观察小鼠一日内给予大剂量钙纳米粒子的急性中毒及死亡情况，得出半数致死量（LD50）或最大耐受量（MTD）。
To observe the acute toxicity and death of the mice to which calcium nanoparticles were given in maximal dose and obtain the lethal dose 50(LD50) or the maximal tolerance dose (MTD).
同时选用正常的NIH3T3细胞为对照，使用含有最小致死量g418及未加g 418的DMEM培养基进行培养，采用光学显微镜对G418抗性NIH3T3细胞进行观察。
Meanwhile, normal NIH3T3 cells were taken as controls, and cultured by G418 contain MFD and by DMEM medium without G418 respectively. Light microscope was used to observe G418R NIH3T3 cells.
同时选用正常的NIH3T3细胞为对照，使用含有最小致死量g418及未加g 418的DMEM培养基进行培养，采用光学显微镜对G418抗性NIH3T3细胞进行观察。
Meanwhile, normal NIH3T3 cells were taken as controls, and cultured by G418 contain MFD and by DMEM medium without G418 respectively. Light microscope was used to observe G418R NIH3T3 cells.
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