除虫菊酯

Methods: Sample preparation with acetic ether-QuEChERS, and then five kinds of pesticide residues in celery cabbage were determined by gas chromatography with electron detector.

采用乙酸乙酯－QuEChERS法进行样品前处理，结合气相色谱－电子捕获检测器对大白菜中5种常见拟除虫菊酯农药残留进行检测分析。

The experimental data indicated that nine kinds of the above studied pyrethroids containing isoxazole were active against cabbage worm and cotton aphid.

初步的试验表明，其中9个异噁唑醚菊酯化合物具有较强的生物活性，为新型拟除虫菊酯的创制提供了参考依据。

Kdr resistance and determination of frequences of kdr gene in house fly field population L1014F is the most common amino acid substitution in the kdr allele. The frequency of the L1014F kdr allele was determined by the method of PASA in fourteen field populations of houseflies with resistance factors at LD〓 for pyrethrin/ piperonyl butoxide and bioresmethrin/piperonyl butoxide from 4 to 29 and 2 to 98, respectively.

击倒抗性及kdr基因频率在家蝇野生种群中的检测 L1014F是击倒抗性等位基因最常见的突变位点。14个家蝇种群对除虫菊酯／胡椒基丁醚和苄呋菊酯／胡椒基丁醚的LD〓抗性倍数分别为4到29和2至98。

The present study was undertaken to explore the effect of DM and/or PM on EAA to provide some scientific basis for the thorough revealment of excitatory neurotoxic mechanism of pyrethroids as well as for the prevention and treatment of poisoning by pyrethroids.

本文旨在研究溴氰菊酯和氯菊酯对以谷氨酸为代表的兴奋性氨基酸的影响，为彻底探讨拟除虫菊酯类农药的神经毒作用机理，为拟除虫菊酯中毒的预防和治疗提供科学依据。

To establish the method of gas chromatography mass spectrometry and selected ion monitoring for the determination of organophosphorus, pyrethroid, organochlorine, carbamate and weedicide pesticide residues in foods.

目的 建立一种测定食品中有机磷、拟除虫菊酯、有机氯、氨基甲酸酯类和除草剂农药残留的气相色谱质谱方法。

Methods The pesticides were extracted with acetone and dichloromethane, warmed with water at 40℃,and circumrotated and evaporated until it was nearly dry, then it was purified by Envi Carb column and Sep Pak NH2 column. Afterwards, gas chromatography mass spectrometry and selected ion monitoring were used to determine 42 pesticide residues, such as organo-phosphorus, pyrethroid, organochlorine, carbamate and weedicide.

该法采用丙酮、二氯甲烷提取，40℃水浴旋转蒸发近干，以Envi-Carb柱和Sep-Pak-NH2柱净化，以气相色谱－质谱选择离子监测方式分析检测有机磷、有机氯、拟除虫菊酯、氨基甲酸酯和除草剂等42种农药残留。

In this paper isopropyl -γ- chlorobutyrate was prepared from γ- butyrolactone by one - step. The effects of molar ratio of reactants, reaction temperature, reaction time on the yield of product were discussed, the optimum reaction condition was obtained.

一氯代丁酸异雨酯是合成新型拟除虫菊酯中间体环丙烷较酸及高效抗菌新药丙氟见酸和环丙氟院酸中间体环丙胺的重要原料［''］。

Pbo significantly synergizes fenvalerate、cypermethrin and methomyl against Xihua field resistant strain ofHelicoverpe armigera , TPP can somewhat synergize pyrethroids also.

对西华田间棉铃虫抗性种群，Pbo能显著地增加氰戊菊酯、氯氰菊酯、灭多威的毒力，大幅度地降低其致死中量，TPP对两种拟除虫菊酯杀虫剂也表现一定的增效作用；对甲基对硫磷、甲胺磷，无论是Pbo还是TPP其增效作用均十分有限。

The bioassay results indicated that PBO synergised 7 pyrethroids significantly, with the highest synergistic ratio (119 3) for fenvalerate and the lowest (2 1) for permethrin.

生物测定结果表明，PBO对所测定的7种拟除虫菊酯均有不同程度的增效作用，对氰戊菊酯的增效比最高(119.3)，对氯菊酯的增效比最低(2.1)。

The results showed that control efficacy of pyrethroid pesticides to insect pests of rice was good.

试验结果表明，拟除虫菊酯农药对水稻害虫具有较好的防治效果，在参试的4种药剂中，以氯氟氰菊酯效果最佳。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐