除草剂

Two haptens of MCPA, 6-[(2-methyl-4-chlor phenoxy aceto amino] hexanoic acid and 4-[(2-methyl-4-chlor phenoxy aceto amino]butanoic acid were synthesized with MCPA and amino-hexanoic acid or amino-butanoic acid.

以除草剂2甲4氯、氯化亚砜、氨基己酸和氨基丁酸等为起始原料，经两步化学反应分别合成了两种MCPA半抗原：6-(2-甲基-4-氯苯氧乙酰基)氨基己酸和4-(2-甲基-4-氯苯氧乙酰基)氨基丁酸。

Some materials were synthesized in this paper at first, 1-nitro-2-pentanol was synthesized with nitromathane and butyraldehyde and the yield was 70.2%; l-nitro-2-pentanol was reduced to 1 -amino-2- pentanol with iron and the yield was 65.2%.

分别用氢氧化钠、三乙胺为缚酸剂，2-氨基-1-丁醇、1-氨基-2-戊醇、环己酮和二氯乙酰氯为原料，采用一步法和分步法合成了两种潜在除草剂安全剂。

So where there is a problem of isoproturon resistance to littleseed canary grass, these alternate herbicides may be used.

作者认为，在草防治上存在有异丙隆抗性的地区，可以使用本研究中的一些除草剂。

The influence of herbicides on catalase activities is discussed.

然后研究了除草剂对土壤中过氧化氢酶活性的影响。

The effects of mefenacet on catalase activity in soil and soil respiration was studied.

通过模拟实验研究了水稻除草剂苯噻苯胺对土壤中过氧化氢酶活性及对土壤呼吸作用强度的影响，并研究了其在不同条件下水解和光解的效果。

Effects of iodosulfuron-methyl-sodium on catalase in soil and soil respiration were studied by simulation in laboratory.

通过模拟实验研究了除草剂碘甲磺隆钠盐对土壤中过氧化氢酶活性和土壤呼吸作用的影响。

The influences of herbicide bispyribac-sodium on soil respiration and the activities of catalase, urease was investigated.

本文研究了除草剂双草醚对土壤呼吸强度和土壤酶活性的影响。

The results show that cattle grazing in rubber plantations increased the population number of land leech by 3.43-folds within one year, while chemical weedings in rubber ledge contour and total area in rubber plantations reduced the population number by 29.82% and 50\^21%, respectively.

结果表明，橡胶园内牛群放牧使海南山蛭种群数量 1年内增加 3 43倍。化学除环山行杂草、化学全面积除杂草使山蛭种群数量在 1年内分别减少 2 9 82 %和 5 0 2 1%。除草剂混入杀蛭农药，使山蛭种群数量 1年内减少 73 0 2 %。

This is specifically due to the clear-cutting of plants over-harvesting the use of chemical fertilizers pesticides herbicides and fungicides and mono-cultural farming.

特别是因为对植物的皆伐和过渡收割，使用化肥、杀虫剂、除草剂、杀菌剂和单一种植等造成。

To understand how the crystal conformer converts to the active conformer, here the internal rotation potential energy surface around the two C—N bonds in the sulfonylurea bridge of monosulfuron has been studied by density functional B3LYP method and 6-31G basis set.

应用密度泛函理论在B3LYP/6-31G水平上对新型除草剂单嘧磺隆绕脲桥部分两个C—N键的内旋转势能面进行计算，然后对势能面上的驻点进行构型优化和过渡态搜索，得到单嘧磺隆4种稳定构象和构象转换过程所涉及的8个过渡态结构。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了