средняя смертельная доза(In toxicology, the median lethal dose, LD50 (abbreviation for "Lethal Dose, 50%"), LC50 (Lethal Concentration, 50%) or LCt50 (Lethal Concentration & Time) of a toxin, radiation, or pathogen is the dose required to kill half the members of a tested population after a specified test duration. wiki Alexander Demidov)
