甲基溴

A novel polymerizable amphiphilic compound with self-assembly ability, 4-2-(acryloyloxy ethoxy benzyl tri-ethyl ammonium bromide, was designed and synthesized. It exhibits good water solubility, strong self-association ability and response to extra-stimulation.

设计并合成了一种新型具有自组装功能的可聚合两亲化合物4-2-(丙烯酰氧基乙氧基苯亚甲基三乙基溴化铵，它易溶于水，具有很强的自缔合能力和对外界刺激的响应性。

A chiral phase transfer catalyst, N-benzyl quinine bromide, was synthesized from natural chiral compound. And 2,5-bimethyl-4-(3-nitrobenzene)-1,4-bihydrogenation pyridine-3--4-methyl formate (viz. nitrendipine) was synthesized by this chiral phase transfer catalysis, and characterized by elemental analysis, infrared spectrum,1H nuclear magnetic resornace, and X-ray single-crystal diffraction.Key words: ammonium; chiral phase transfer catalyser; crystal structure

通过对天然手性物质进行修饰合成手性相转移催化剂N-苄基溴化奎宁，并对目标分子2，5-二甲基-4-(3-硝基苯)-1，4-二氢吡啶-3-甲酸乙酯-5-甲酸甲酯进行不对称催化合成，并通过红外光谱和核磁共振氢谱对化合物进行了表征，用X射线单晶衍射法测定了该化合物的晶体结构。

In addition, pesticides can also abnormal sperm, and lead to miscarriage, stillbirth, birth defects, such as benomyl, DBCP, methylmercury, such as epoxy heptachlor.

另外，农药也可使精子异常，而导致流产，死胎、新生儿缺陷，如苯菌灵、二溴氯丙烷、甲基汞、环氧七氯等。

An important intermidiate 2-butyl-4-chloro-5-(4-bromomethyl phenoxy) pyridazinone 3 was first obtained from 4,5-dichloropyridazinone using two different methods. Compounds 4a～4l were synthesized by the reaction of 3 with different oximes.

从2-叔丁基-4，5-二氯哒嗪酮出发，以两种方法合成了中间体2-叔丁基-4-氯-5-(4-溴甲基苯氧)哒嗪酮(3)。3与肟反应合成了含哒嗪酮的苄基肟醚类化合物4a～4l。

Moreover, the protein-free spreading-free spreading technique, involvingbenzyldimethyl-alkyammonium bromide and the denaturing agent formamide, wasestablished. With very low DNA concentration, the fully extended DNA samples for linearDNA can be prepared.

采用Sephadex色谱柱分离，保温稀释的DNA溶液，不仅可除去DNA链上吸附的盐，而且可使盘绕一起的DNA链部分展开；在此基础上，通过采用苯二甲基辛基溴化胺－甲酰胺微量展层技术，可使纳克级DNA完全展开到云母基底上。

In an acetate buffer of pH 6.0,and in the presence of CTMAB,a stable complex,having the mole ratio of 1 to 3,was formed between cobalt ion and nitroso R salt,which was concentrated on C18 solid phase extraction column,achieving a concentration multiplication of 100 times.

研究了用亚硝基R盐离子对固相萃取光度法测定钴，在pH 6.0的HOAc-NH4OAc缓冲介质中，溴化十六烷基三甲基铵存在下，亚硝基R盐与钴反应生成3∶1稳定络合物，该络合物可用C18固相萃取小柱富集，富集倍数达100倍，小柱上富集的络合物用乙醇洗脱后用光度法测定，钴的质量浓度在0.05~5.0 mg.L-1内符合比耳定律。

I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像，后来回台湾，甚至去年在北京，居然也四处看见她的海报，才惊讶她的魅力之大。