lc50

LC50 was 717.13 times liquid in fumigation test .

熏蒸试验LC50为717.13倍液。

LC50 of Beijing population and Yunnan population were 15.7 , 22.3 times that of susceptible population .

北京种群和云南种群LC50分别是敏感品系的15郾7、22郾3倍。

The poison experiments to these insects ( LC50 ) had been carried out .

另外还进行了实库杀虫实验和动物毒理试验。

Results The LC50 of the prepared gaseous mixture was 26.84 g / m3 for Kunming mice .

结果混合物小鼠LC50为26.84g/m3。

With the prolonging of exposed time , LC50 of the extracts were getting lower and lower , but changing ranges were different .

各提取液的半致死浓度（LC50）随着藤壶无节幼体在各提取液中的暴露时间的延长越来越低，但下降幅度存在一定差异性。

Lethal concentration ( LC50 ) The water in the lake is comparatively cold and the lake remains frozen half of the time each year .

半致死浓度（LC50）池水温度较低，一年中有半年冰封期。

Methomyl has a maximum LC50 at 30 ℃, which is 2.30 times than 15 ℃ . Methomyl is showed to be a negative temperature coefficient insecticide .

灭多威在30℃有最大LC50，是15℃的2.30倍，表现为负温度系数药剂。

The 24 h LC50 value of parts of pesticides was close to the 48 h and 96 h LC50 , and could substitute for them and shortened the detecting time .

部分被检测农药的24hLC50与48h和96h结果相近，可以用来代替48h和96h的毒性测试结果，缩短了毒性测试时间。

The acute toxicity of the wastewater to fishes could decrease gradually during the process of biodegradation . The 24 ~ 96h LC50 to fishes was raised gradually with the degradation time .

此类废水在降解过程中对鱼类的急性毒性也逐渐下降，对受试鱼类24~96h的LC50值随着降解时间的推移而逐渐增大。

In the same condition in laboratory , LD50 or LC50 of 3rd instar larva of susceptible strain and Lambda-cyhalothrin resistant strain of beet armyworm were determined .

研究结果如下：1、在室内相同条件下，分别用点滴法和浸叶法测定甜菜夜蛾抗氯氟氰菊酯品系和敏感品系3龄幼虫LD50（ug/头）或LC50值（mg/L）。

To determine influence on uptake toxicity of chemical to Artemia , A bioassay using Anemia has determinated the 24h , 48h LC50 for several heavy metals and compounds in filtered sea water .

用卤虫（Artemia）进行的活体检定已经得出了在过滤海水中几种重金属及其混合物24小时及48小时的半死致浓度（LC50）。

In the LC50 bioassay on Helicoverpa armigera of high and low volume flask culture , the LC50 of VHb expression strain reduced 36.6 % and 10.0 % , respectively . 3 .

高、低两种装液量摇瓶发酵中，VHb表达菌株与对照相比，其对棉铃虫（Helicoverpaarmigera）幼虫的LC50值分别下降了36.6%和10.0%。

In this article , authors introduce application of LC15 ~ LC50 structural lightweight aggregate concrete prepared with clay ceramsite and whose density degree is 1 700 ~ 1 800 in 3 building projects in Kunming city .

介绍了采用粘土陶粒配制的密度1700~1800级的LC15~LC50结构轻骨料混凝土在昆明3个房建工程中的应用。

LC50 of contact poison was 771mg / ml. The extracts of Xanthium sibiricum showed antifeeding action to the larves of Mythimna separata .

触杀毒力的测定结果表明，苍耳提取物对粘虫的LC50为771mg/ml。

In the test , Brocarded Carp was chosen as test animal and was exposed to different doses of the three nitrobenzene compounds , and 96 h LC50 was calculated according to lethal rates of the fish .

以锦鲤鱼（BrocardedCarp）为试验生物，将其暴露于3种化合物不同浓度的试液中，通过鱼类的死亡率求出96h半数致死浓度（LC50）。

Their respective value of LC50 was 0 . 19,0 . 58,0 . 24 and 0 . 82ng / g. They can be used to determine lower limit of the four kinds of herbicides residues in soil .

苄嘧磺隆y＝1.937－0.199x。其LC50值分别为0.19、0.58、0.24、0.82ng／g，可作为检测其残留量的下限。

Cyhalothrin was the most toxic , with an LC50 of 0.6786 mg / kg , indicating a toxicity more than 140 times that of acephate . Cyhalothrin could be recommended for use in crop production .

氯氟氰菊酯的毒力最高，LC50为0.6786mg/kg，比乙酰甲胺磷高140倍，在生产上可推荐使用。

Wistar rats were used to determine the LC50 of p-dichlorobenzene by acute aspiration intake ( 2 h ), subacute toxicity test and genotoxicity test had been done through inspiration ( exposed for 14 d and 28 d ) .

采用Wistar大鼠进行急性经呼吸道半数致死浓度（LC50）试验（急性吸入染毒2h），并进行了亚急性吸入毒性试验和遗传毒性试验（14、28d）。

The LC50 of Beta-cyfluthrin was 0.0048mg/g which was 0.5 % of that of Beta-cypermethrin ( CK ) .

高效氯氟氰菊酯的致死中浓度为0.0048mg/g是高效氯氰菊酯的0.5%。

The 48h LC50 ; values for zoea , mysis and postlarva are 11 . 19 , 11 . 41 and 37 . 34 mg / dm3 NO-2-N.

状、糠虾、仔虾48h的LC50值分别为11.19、11.41和37.34mg／dm3NO-2-N；

The probabilities of death , coma were analyzed with Bliss method and their linear regressive equations of probit were obtained respectively , their 50 % lethal concentrations ( LC50 ) and 50 % coma concentrations ( CC50 ) were calculated by the formulas above .

采用Bliss法，计算其死亡率和昏迷率的加权直线回归方程，并获得其经救治后血液半数致死浓度LC50、半数致昏迷浓度CC50。

Ethanol was significantly toxic to cultured microglia cells , and the effect was dose dependent . The LC50 for microglia survival was at the dose of 0 085g ethanol / dl . Up to 80 % of cell death was observed at 0 5g / dl .

结果显示：酒精对体外培养的小胶质细胞具有明显的毒性作用，存在剂量－反应关系，半数致死浓度为0.085%，在最高染毒浓度组可观察到80%的细胞死亡。