除草剂

Transgenic plants were obtained by basta screening and PCR amplification.

转化T1代植株经除草剂Basta筛选和PCR扩增获得转化植株。

In summary, 4, 6-dimethoxy-2-substituted pyrimidine benzylamine is chosen as a lead compound based on the possibility of synthesis, optimization, and the herbicidal activity.

考虑到合成的可行性、分子结构的可修饰性和除草活性的大小，确定4，6-二甲氧基-2-取代嘧啶苄胺类化合物为除草剂的先导结构。

It is Concluded that the mode of action of pyrimidine benzylamine differs from the other typically commercial ALS inhibitors, such as sulfonylurea and pyrimidine salicylic acid herbicides. Its herbicidal activity is activated by the metabolic processes in the plants.

离体条件下，化合物104-4 IC_(50)＞100 mg／L，而除草剂双草醚IC_(50)值为10~(-5)～10~(-4)mg／L，说明化合物104-4对离体ALS没有抑制作用；活体条件下，化合物104-4对ALS有一定的抑制作用，且随着处理时间的延长，酶活力降低，对ALS的抑制作用增加。

The pyrimidine lead compound is obtained via herbicidal activity screen. The optimization of lead compound leads to find the good pyrimidine benzylamine candidates with highly effective herbicidal activity. The novel herbicidal mechanism of pyrimidine benzylamine is put forward. N-(2-bromophenyl)-2-(4, 6-dimethoxypyrimidin-2-yloxy)benzylamine (103-1) has potential as a new selective post-emergent herbicide in oilseed rape.

通过系统的研究工作，发现了具有除草活性的嘧啶先导结构，经结构优化，筛选出具有高除草活性的嘧啶苄胺类优选结构，发现并提出了此类化合物的除草作用新机理，最终经田间试验证实了N-(2-溴苯基)-2-(4，6-二甲氧基-2-嘧啶氧基)苄胺(103-1)可作为超高效油菜田除草剂进行工业性的研究与开发。

The main achievements of the project are as follows: 1 the hypothesis that a decrease in seed mass causes an increase in mean dispersal distance has been tested based on the experiments of weed dispersal by wind. The experimental results partly support the hypothesis. The results will help farmers to make an optimal strategy of weed control; 2 a statistic method for inferring probabilistic distribution function of a random variable has been developed, by which probabilistic distribution functions of weed species dispersal have been determined; 3 the reproduction structure of Bromus sterilis has been studied; 4 a more complex CA model with 25 neighborhood cells were built, which can simulate spread of a weed population. This work promotes developments in both theory and application of CA models; 5 the "mean law" in weed control has been proposed. Accordingly, the algorism of patch spring may be calibrated; 6 the "patch" and "true patch" have been mathematically defined so that herbicide can be efficiently applied; 7 simulation validates that initial configurations of weed will affect dispersal of its population and strategies of controlling it, or its distribution patterns affect its dispersal progresses.

主要完成的工作和取得的成果有：1）用实验证实了重量较轻的杂草种子并不一定飞得比较重的远，其结果有助于农民制订杂草的优化控制策略；2）发展了一种推断随机变量分布函数的统计方法并用它来获得了几个杂草种的扩散分布函数；3）对杂草Bromus sterilis的繁殖结构进行了研究；4）建立了一个具有25邻的较复杂的能模拟杂草扩散的CA模型，并在理论和应用方面促进了CA模型的发展；5）在杂草控制方面提出了&平均法则&，据此可对按块施药方法进行校正；6）精确地定义了&块&和&真块&以便在杂草控制中能更有效地使用除草剂；7）模拟证实杂草种群的初始配置影响其扩散和控制策略，或者格局影响过程。

All results suggested that four herbicides can cause significant genetic damage s to the erythrocytes of Bufo bufo gargarizans.

这四种除草剂对蝌蚪红细胞具有显著的遗传毒性，其中使它隆的毒性要大于其它三种。

Results: Time and concentration of poison dying all had effect on the myocardial contracts dint and myocardial enzymogram of Bufo bufo gargarizans.

结果：除草剂丁草胺的染毒时间和浓度均可影响蟾蜍心肌收缩力和心肌梅谱。

Objective:To observe the effect of the herbicide butachlor on myocardial contracts dint and myocardial enzymogram of Bufo bufo gargarizans,and to study physiological toxicity of herbicide butachlor on myocardial of Bufo bufo gargarizans.

目的：观察除草剂丁草胺对蟾蜍心肌收缩力和心肌酶谱的影响，探讨丁草胺对蟾蜍心肌的生理毒性。

The fungus Cercospora piaropi is a world-acknowledged potential mycoherbicide agent for controlling water hyacinth with its high security and efficiency.

尾孢菌属的Cercospora piaropi是一种公认的有潜力开发成为水葫芦生物除草剂的真菌，具有安全、高效等特点。

A method for preparation of Isoproturon from chloroformate as starting material was reported.

报道了以氯甲酸甲酯为起始原料合成除草剂异丙隆的方法。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。