甲基

This is transformed into anomeric acetates 16, which is used for the synthesis of a number of 2＇, 3＇-dideoxy-2＇-trifluoromethylnuclosides via Vorbruggen glycosylation reaction. At the same time, L-2-tifluoromethyl-4-thiofuranosides 39 were also prepared from the key intermediate lactone.

从这一砌块出发，经由关键中间体2-三氟甲基-γ-丁内酯转化得到的化合物16的Vorbruggen糖苷化反应，合成了2＇，3＇-双脱氧-2＇-三氟甲基嘧啶核苷。

It presents historical demand data for 1997, 2002 and 2007 and forecasts to 2012 and 2017 by product (e.g., methyl cellulose, carboxymethyl cellulose, wheat proteins, collagen, starch blends, xanthan gum, hyaluronic acid, guar gum, gum arabic, carrageenan, alginates, polyterpenes), and market (e.g., food and beverages, medical, oilfield).

按照产品类型（如甲基纤维素，羧甲基纤维素，小麦蛋白，胶原蛋白，淀粉共混物，黄原胶，透明质酸，瓜尔豆胶等），市场（例如，食品和饮料，医药，油田）报告提供了历史需求数据（1997年，2002年及2007年）以及预测了2012年及2017年的需求。

4 Kinds of methylthiazoline multithioether s were synthesized from the nucleophilic substitution of 5-methyl-thiazolidine-2-thione reacting with bromides,respectively.

通过5-甲基-2-噻唑烷硫酮与溴代物的亲核取代反应合成了四种甲基噻唑啉多头硫醚，利用红外光谱、核磁共振(1H NMR)光谱和元素分析对这四种化合物的结构进行了表征。

Some stimulators, including viruses, tumor cells and hot shock, could promote the expression of NKG2 receptors and their ligands via activating certain transcription factors which are capable of up-regulating NKG2 promoters' activity. Meanwhile, epigenetic mechanisms including DNA methylation and histone posttranslational modifications are also critical to expression of NKG2 receptors and their ligands and may control the clonally distribution of some NK cell receptors.

病毒、肿瘤和热休克等刺激可以通过激活相应的转录调节因子，提高启动子活性而上调NKG2家族受体及其配体的表达，而启动子区DNA的甲基化状态、组蛋白的乙酰化和甲基化等表观遗传调控，在NK细胞受体及其配体的表达方面亦起重要作用，并决定NK细胞受体的克隆性分布。

Ongoing studies have shown that disulfiram also appears useful for methamphetamine abuse, he added. His current research team is developing a methamphetamine vaccine and performing animal studies in partnership with Merck.

Kosten博士补充表示，目前的研究显示disulfiram也对甲基安非他命滥用的治疗是有效的，他的研究小组目前正与默克公司合作研发甲基安非他命疫苗的动物试验。

In the asymmetric epoxidation of cis-β-methylstyrene, the selectivity and enantiometric excess for the epoxides reached 96% and 78%, respectively. The recyclability of the catalyst was also studied.

结果表明，该配合物对顺－β-甲基苯乙烯的不对称环氧化反应具有很好的催化性能，产物选择性达96%，ee值达78%，以顺－β-甲基苯乙烯为底物，m-CPBA为氧化剂，考察了该配合物催化剂的循环使用性能。

The results of the experiments show that the photocatalytic activation of T-ZnO whiskers accords with the rule of first-order reaction,and the optimal concentration of T-ZnO whiskers is 2g/L.

研究了四针状氧化锌晶须在紫外光照射条件下对甲基橙的降解活性，考查了甲基橙溶液初始浓度、催化剂浓度及种类等对光催化降解的影响，并初步探讨了其反应动力学。

The copolymer derived from the copolymerization in high capacity kettle were testified that copolymerization between AN and MMA occurred. The microcapsules in the films are distributed in the copolymer film matrix. The heat-absorbing temperatures and heat-evolving temperatures of the films are almost the same as that of the MOCT, respectively. In addition, the enthalpy efficiency of MOCT, the melting enthalpy and the crystallizing enthalpy rises with the contents of MOCT increasing.The decomposition temperature of copolymers in the films containing various contents of MOCT decreases with the contents of MOCT increasing.

采用30升聚合釜合成了丙烯腈—甲基丙烯酸甲酯共聚物，证实了丙烯腈和甲基丙烯酸甲酯发生了共聚反应；正十八烷微胶囊分散和镶嵌到了共聚物膜基体中；正十八烷微胶囊含量不同的共聚物膜的吸热温度放热温度与纯正十八烷微胶囊的吸放热温度基本相同；随着正十八烷微胶囊含量的增加，共聚物膜的热焓和热效率逐渐增加；共聚物膜中的共聚物的热稳定性温度随着正十八烷微胶囊含量的增加逐渐减小，共聚物膜的结晶度则有所增大。

Ten N-[2,4-disubstituted-5-(3-methy-2,6- di-oxo-4-trifluoromethyl-1,2,3,6-tetrahydropyrimidin-1-yl)phenyl]imides were designed and synthesized. Their structures were confirmed by 1H NMR, IR, HPLC/MS and elemental analysis.

设计并合成了10个未见文献报道的N-[2，4-二取代-5-(3-甲基-2，6-二氧-4-三氟甲基-1，2，3，6-四氢嘧啶-1-基)苯基]酰亚胺类化合物，其化学结构经1H NMR， IR， HPLC/MS和元素分析表征。

Therefore,it is necessary to develop new routes to prepare anion exchange membranes without such chloromethylation process.As for cation exchange membranes, mostly-perfluorinated sulfonic acid ionomers,such as Nafion~ series,have been wildly used due to their high proton conductivity and substantial durability.

对于强碱性的阴离子交换膜的制备，由于传统路线中的卤甲基化步骤中不可避免的采用强致癌物质二氯甲醚，因此无论是从经济成本还是环境保护方面，开发不采用氯甲基化步骤的阴离子交换膜制备方法是目前的一个迫切要求。

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。