苯甲基

Last year the National Sheriffs' Association said:"The war on drugs in America is currently facing its most difficult and most dangerous challenge to date as a result of methamphetamines."

去年，国家州长会议提出：&由于甲基苯丙胺的出现，在美国对违禁药品的打击行动，当前已经到了面临更大难度和更高危险挑战的时刻。&

Only the molar ratio 0.3 mol% of copper o-toluenesulfonate to alcohol or phenol was efficient to complete the reaction in a short time.

在乙酸存在条件下，体系的催化性能有显著提高，邻甲基苯磺酸铜用量仅需0.3 mol%就能使反应在较短时间内完成。

TpRu(PPh3)(CH3CN)2PF6 (10mol%) catalyst effected the nucleophilic addition of water,alcohols,aniline, acetylacetone, pyrroles, and dimethyl malonate to unfunctionalized enediynes under suitable conditions (100 °C, 12 24 h) and gave functionalized benzene products in good yields.

TpRu 2PF6 （ 10mol ％）催化剂的影响的亲核加成的水，醇，苯胺，丙酮，吡咯和二甲基丙二酸对unfunctionalized enediynes适当的条件下（ 100 ℃， 12日24小时），并官能苯产品良好的收益。

The premixing self-assembly solution of horseradish peroxide with poly(sodium 4-styrenesulfonate) is made by blending HRP and polyelectrolyte PSS,and the active.enzyme muhilayer biofilm is fabricated by altemate deposition of and PDDA on the surface of negative ionized PET.

以阳离子化的辣根过氧化物酶和阴离子聚苯乙烯磺酸钠的预混合溶液，与阳离子聚电解质聚二甲基二烯丙基氯化铵通过逐层组装，在阴离子化聚对苯二酸乙二酯表面构建了多层生物活性膜。

Using free radical 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinyloxyl as catalyst, the phase transfer catalyzed method of oxidation of anilines to 15 symmetrical azobenzenes with a saturated solution of potassium ferricyanide in 2N aqueous potassium hydroxide and dichloromethane was described for the first time.

用2，2，6，6-四甲基-4-羟基-1-哌啶氮氧自由基为催化剂，芳胺类化合物在饱和铁氰化钾的氢氧化钾溶液和二氯甲烷的两相转移催化下合成了15 个对称取代偶氮苯。

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。

The liquid phase oxidation of 2-nitrotoluene and 2, 4-dimethylnitrobenzene with air, oxygen or chemical oxidants were studied.

中文摘要：研究了2-硝基甲苯和2，4-二甲基硝基苯在液相条件下的空气／氧气氧化和化学氧化剂氧化。

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。

Mesoporous tin oxide was synthesized by using cetyltrimethyl ammonium bromide or CTAB and Tween-20 as the template or hydrothermal process. Hollow tin dioxide micospheres were synthesized by using resorcinol-formaldehyde gel as the template or hydrothermal process. Thermogravimetric analysis, X-ray diffraction and electron microscopy have been used to characterize the materials.

本文分别采用十六烷基三甲基溴化铵模板法、CTAB和吐温20复合模板法及水热法来合成介孔氧化锡；用间苯二酚和甲醛凝胶模板法及水热法合成空心球氧化锡，并用热分析、X射线衍射、电镜等对以上材料作了形貌及结构表征。

Methods The present study has been carried out using NaCMC injected into the mice's abdominal cavity to cause inflammation and induce white blood cell migration,varnishing DNFB to induce mice's DTH,injecting colloid activated carbon suspension into mice's tail vein,with 10% of sheep RBC injected into the abdomen to immunize mice.

方法采用大鼠腹腔注射羟甲基纤维素钠致炎诱发白细胞游走，涂抹二硝基氟苯诱导小鼠迟发型超敏反应，小鼠尾静脉目的观察小儿利咽康颗粒剂的免疫调节作用。

Now, however, all children continue in "comprehensive" schools, and the eleven-plus determines which courses of study the child will follow.

然而现在，所有的孩子都要在综合学校继续学习，所以这次考试只是决定他们将要学习哪些课程。

Cultivatable land , and led to a general recognition that development must not be carried at the cost of agriculture .

城区的迅速扩大在很多情况下侵占了宝贵的可耕地，使人们普遍认识到发展不能以牺牲农业为代价。