median lethal temperature

Crawfishes ( Cambarus proclarkii) as animal were infected with white spot syndrome virus ( WSSV) for studying various infection characters, including temperature, transfer route, successive infection, median lethal dose ( LD 50), immunity against virus and virus conservation etc.

应用克氏原螯虾作为动物模型研究对虾白斑综合征病毒（WSSV）的感染增殖特性，涉及感染温度、感染途径、继发感染、半数致死量（LD50）、免疫保护及保存期等。

The phenols content is high and the median lethal temperature is low, then cold resistance is strong in the green up period, fist period of exuberance and withering period.

在高寒植物的返青期、草盛前期和枯黄期，酚类物质含量高，半致死温度低，抗寒性强；

The cold resistance of the 6 spices alpine plants varies with air temperature. The change curve of the median lethal temperature is a single peak.

在整个生育期内，6种高寒植物的抗寒性具有随环境温度变化而改变的特性，它们的半致死温度的呈单峰变化趋势。