Acute toxic test indicated that the LD50 of CFA was 2.925%/ kg.

It's LD50 is 8.67 etc. The authors believe that it is a new virus disease in duck.

对氯仿有抵抗，对鸭胚的LD50为8.67，无血凝性、初步认为本病是一种新鸭病，暂定名为鸭传染性肿头症。

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It is safe according to the acute toxic test ( LD50> 21.5 g/ kg).

急性毒性实验表明受试物安全无毒（LD50＞21.5g／kg）。

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Results LD50 for urea by intragastric administration is 8471 mg/ kg in rats.

结果尿素的大鼠经口LD50为8471mg/kg。

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The LD50 of submicro-emulsion and injection in mice were studied.

考察汉防已甲素亚微乳和注射液对小鼠的LD50值。

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Methods The acute oral LD50 was determined by a single dose limited ingesting of test reagent.

方法采用一次性限量灌胃法测定急性经口LD50；

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RESULTS: The LD50 of mice in the acute toxicity test was four to five times more than the control group.

结果：小鼠急性毒性实验的半数致死剂量（LD50）保健香烟组比原香烟对照组增加了4~5倍；

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Results Oral LD50 for mice was greater than 5 000 mg/ kg calculated by Horn method.

结果采用霍恩法计算聚天冬氨酸小鼠经口半致死量（LD50）大于5000mg/kg；

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Results: The curve of SNP concentrations of LD50 indicated a time-dependent decrease trend.

结果：半数软骨细胞致死的硝普钠浓度呈时间依赖性下降；

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The acute oral LD50 in mice is about 2g/ kg.

小鼠口服急性LD（50）约为2g/kg。

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Results: LD50 in rats and mice were more than 10 g/ kg;

结果：川贝枇杷糖对两种性别小鼠、大鼠经口急性毒性试验，LD50均大于10g/kg，属实际无毒物；

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Method: Classical LD50 test.

方法：经典的半数致死量LD50测定法。

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Methods: LD50 was determined in mice.

方法：测定小白鼠LD50，观察其急性毒性反应；

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The Lethal Dose 50 test ( LD50) may also be replaced.

致死计量50实验（LD50）也可以被代替。

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The LD50 of o-toluidine in mice by mouth is 755mg/ kg. o-toluidine has lower toxicity.

邻甲苯胺经口半数致死量为755mg／kg，属低毒类。

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LT50 of the cockroach bait with this compound ranged between 1. 6-2. 3 days for Periplaneta americana and 1. 5-1. 8 days for Blattella germanica.

结果：合成了N-正丁基全氟辛烷磺酰胺，配制成毒饵，对美洲大蠊的LT50为1.6～2.3天，对德国小蠊为1.5～1.8天，7天死亡率达100%。

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This paper reported the determined result of toxic effects of CUZ against Blattella germanica in laboratory. It indicates that the LT50 was 6. 8 days. Whose 95% confidence limits was 6. 36-7. 24 days.

本文报道了赛优杀（CUZ）对德国小蠊的毒效测定结果，其LT（50）为6.8天，95%可信限为6.36～7.24天；

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The LT50 value for the virus ( 106 CPB/ ml) to the third and the fifth instar larvae were 9.6 and 10.5 days respectively. In another word, the LT50 value increased with the increased instar.

1×10°CPB/ml的多角体悬液对3龄、5龄幼虫的LT（50）分别为9.6天和10.5天，即LT（50）随龄期的加大而延长；

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And under the treatment of 5.0 X 107 conidia/ ml and 1.0 X 107 conidia/ ml, LT50 is 7.3? 1. Od and 8.5+ 1. Od.

在5.0×10~7conidia／ml和1.0×10~7conidia／ml处理下的致死中时间（LT（50））分别为7.3±1.Od和8.5±1.Od。

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The electrical leakage conductivity of leaves could indicate the cold resistance in leafing date more exactly and simply measured at the temperature near LT50 of most walnut germplasms.

在接近大部分核桃种质LT50的温度下测定相对电导率可以较准确的反映不同种质叶片的抗寒性。

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Improvement of Bottom Boundary Condition Expressions in 3D PE on the principle of energy conservation; Low Temperature LT50 of Three Eucalyptus Seedlings with Electrical Conductivity Method and Logistic Equation

三维抛物方程方法中海底边界条件改进处理的能量守恒方法应用Logistic方程确定三种桉树的低温半致死温度

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