查询词典 toxicity

In order to explain the toxic mechanism, it studied the toxicity effect of each chemical for Chl-a and protein and finds that chlorobenzene has the most toxicity to Chl-a and protein, bringing much phaeophytin and effecting photosynthesis efficiency.

探讨了六种化学品对小球藻的致毒机理，发现氯苯对小球藻的叶绿素a含量及蛋白质含量的影响最严重，并且在化学品的胁迫作用下产生大量的脱镁叶绿素a，影响藻类的光合作用效率。

The results of toxicity determination of benzoic acid and phenylacetic acid showed that BA and PA were all toxic to masson pine excised needle and excised branch, among those the toxicity of BA was stronger.

3苯甲酸和苯乙酸的毒性测定显示，苯甲酸和苯乙酸对马尾松离体松叶和离体松枝均具有毒性，其中苯甲酸的毒性较强。

The single toxicity of Chlorpyrifos, Diazinon and Malathion and joint toxicity of ternary mixtures of organophosphate insecticides to photobacterium phosphoreum were determined.

实验测定了三种有机磷杀虫剂毒死蜱、二嗪农和马拉硫磷三种杀虫剂对发光菌的单一毒性，以及固定比率配比下三种有机磷杀虫剂的三元混合体系的联合毒性效应。

Temperature showed significant effect on the toxicity of avermectin to the second instar larva of Plutella xylostella.The toxicity become greater as temperature ranged from 15 -~-- 32 C .

温度对阿维菌素的毒力有较大的影响，在15～32℃温度范围内，阿维菌素对小菜蛾幼虫的毒力随着温度的升高而增强，温度从15℃上升到32℃，阿维菌素对小菜蛾幼虫的毒力增加了32.35倍。

Closed-system algal toxicity test was applied to evaluate the toxicity of secondary and tertiary propargylic alcohols to Pseudokirchneriella subcapitata. The effects of propargylic alcohols were evaluated by three kinds of response endpoints, i.e., dissolved oxygen production, cell density, algal growth rate.

bstract：本研究以藻类（Pseudokirchneriella subcapitata）利用BOD瓶进行一密闭式系统之毒性试验，使用溶氧变化量，藻细胞的数量变化，以及以藻类细胞密度变化量计算所得的生长率三个终点，评估二级以及三级炔丙基醇类之毒性，藉由Probit模式求出半致死浓度（50% Effect concentration，EC50）。

In this thesis, the acute lethal toxicity to Rana japonica tadpoles, the short-term phytotoxicity to Cucumis sativus and the population growth inhibition toxicity to Tetrahymena pyriformis of selected substituted phenols with multiple mechanisms of toxic action were compared and interspecies correlation was investigated.

本文比较了具有多种毒性作用机制的取代苯酚对两栖动物幼体的急性致死性毒性、对高等植物生长的抑制毒性以及对原生动物—四膜虫的种群生长抑制毒性，探讨了这一类污染物的毒性作用机制，进行了种间相关性研究。

Although belonging to non-permanent materials, they still have some toxicity to men and animals because they may also have a long remanet term in some cases and can accumulate in vivo. Some researches reported that those substances with low toxicity can even lead to cancer and malformation in animals.

尽管生物碱，有机磷农药属非持久性物质，但其对人、畜仍有较大毒害作用，在某些环境条件下也会有较长的残存期并在动物体内产生蓄积作用，易发生中毒，已有研究表明，某些物质对动物有致畸性和致癌性。

We explore the relation between structure and activity , structure and toxicity from electronic structure and three—dimensional conformation in order to provide theoretical foundations for predicting the activity and toxicity of these chemical compounds, researching into mechanism of action and choosing safener.

通过比较四种均三氮苯类除草剂的红外光谱特征吸收的实验值和计算值，并运用规范不变原子轨道法GIAO法在RHF/6-31G水平上计算出西玛津的δ~1H-NMR和δ~(13)C-NMR，与实验值的对比统计分析，结果表明：用RHF/6-31G优化的分子构型最佳，AM1法次之，考虑到优化时间和研究的需要，我们在研究均三氮苯类除草剂分子的结构与活性关系时，为了进行深入、精确的理论研究，采用从头算RHF/6-31G进行优化；而对于此类化合物的结构与毒性的关系研究时，更注重分子的量子化学参数的相对值而非绝对值，因而采用AM1的方法。

Function mechanism of Bt to Helicoverpa armigera and Mythimna separata is studied in this thesis. The results are as follows:1 Bt CrylAc toxin has high toxicity to H. armigera, but has low toxicity to M. separata.

本论文是以棉铃虫和粘虫为实验试虫，研究苏云金芽孢杆菌Bt CrylAcE毒素对昆虫的作用机理，为更好的了解Bt的作用机理以及了解昆虫的抗性问题奠定理论基础。

Regressive analysis showed that there were linearly positive relationships between PC contents and Cd toxicity in E. nuttallii and P. stratiotes L.. It was indicated that PCs could be a promising biomarker for estimating Cd toxicity.

回归分析显示，2种水生植物体内PCs的合成水平与Cd的生物毒性呈现一定的线性关系，表明PCs可作为重金属Cd胁迫的生物标记物指示水体中重金属的毒害程度。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。