为今后的生物监测提供可靠的半致死浓度的数据。
The median lethal concentration data is reliable for future biological observation.
低温预处理可以诱导对致死浓度h2o2的抗性。
Pretreatment of low temperature could induce resistance to lethal concentration of H2O2.
浓度梯度按等对数间距设置，半致死浓度采用直线内插法进行计算。
The grades were designed by equal space between logarithm, and the median lethal concentration was computed by Linear Regression.
结果表明，苜蓿愈伤组织经DES处理，DES的半致死浓度为0 3% ，愈伤组织的抗寒性增强。
The DES concentration resulting in 50% death was 0.3%, and the cold resistance of alfalfa callus was increased.
她说，对于铜来说，半数致死浓度lc50(一定时间内受试动物半数死亡的毒物浓度)随温度减弱-这就意味着毒性增加。
For copper, she said, the LC50 (the concentration lethal to half of any given species over a certain time) decreases with temperature - meaning that toxicity increases.
如果身体直接与风扇接触，则可能因二氧化碳饱和浓度上升、氧气含量减少而致死亡。
If directly in contact with a fan, this could lead to death from increase of carbon dioxide saturation concentration and decrease of oxygen concentration.
在最近几年里，美国马拉松跑步者已经经历了由于饮水过量导致血钠浓度过低或低钠血症的致死事件。
In recent years, U. S. marathons have experienced participant deaths due to excessive intake of water, which can lead to an abnormally low level of sodium in the blood, or hyponatremia.
轻、重污染区致死病的方面的差别可能是一氧化碳浓度以外的许多因素所造成的。
Differences in case fatality between high and low pollution areas could be due to many factors other than co concentrations.
然而，这些亚致死的症状并没有观察到鱼种虹鳟鱼暴露在平均浓度百万分之22.3的F-后8天。
However, these sublethal symptoms were not observed in fingerlings of rainbow trout exposed to a mean concentration of 22.3 ppm F- after 8 days.
长时间接触亚致死剂量的消毒剂可以诱导对该种消毒剂的抗性增强，提示在日常消毒工作中应注意足量使用消毒剂，不能随意降低浓度长期使用。
Suggesting that in our daily disinfection work should pay attention to the use of disinfectants in sufficient dose and can not arbitrarily reduce the concentration of long-term use.
然而，一旦致死毒素达到一定浓度时，由于竞争效应，CLBP亲和力较低，无法与底物有效结合，从而导致协同作用效应消失。
But when concentration of CTX is high to some extent, CLBP can't combine with substrate because of competition effect, thus the synergic effect disappeared.
应用一定浓度的水溶性粘合剂POA与病原线虫混合 ，可提高线虫的存活率、毒力及对寄主的致死速度。
This paper has been introduced that one kind of water dissolving binder POA have been used mixing with entomopathogenic nematode Steinernema carpocapsae A 24 .
应用一定浓度的水溶性粘合剂POA与病原线虫混合 ，可提高线虫的存活率、毒力及对寄主的致死速度。
This paper has been introduced that one kind of water dissolving binder POA have been used mixing with entomopathogenic nematode Steinernema carpocapsae A 24 .
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