甲基

Picoline was treated with hydrogen peroxide to form intermediate N-oxide-3- methylpyridine then chloridized with benzoyl chloride to form 2-chloro-5-methylpyridine.

以3-甲基吡啶为原料通过过氧化氢氧化得中间产物3-甲基吡啶-N-氧化物，再用苯甲酰氯氯化得到粗产品2-氯-5-甲基吡啶。

Vitamin E, or tocopherol, is a lipid-soluble antioxidant and essential for human health. 2-methyl-6-phytyl-1, 4-benzo- quinol methyltransferase, one of the key enzymes in vitamin biosynthetic pathway in plants, converts 2-methyl- 6-phytyl-1,4-benzoquinol to 2,3-dimethyl-6-phytyl-1,4-benzoquinol.

维生素E是一类人体必需的脂溶性抗氧化剂，具有重要的生理功能。2-甲基-6-叶绿基-1，4-苯醌甲基转移酶是天然维生素E合成途径中的关键酶之一，催化MPBQ甲基化，生成DMPBQ。

Methyl-6-phytyl-1, 4-benzo- quinol methyltransferase, one of the key enzymes in vitamin biosynthetic pathway in plants, converts 2-methyl- 6-phytyl-l,4-benzoquinol to 2,3-dimethyl-6-phytyl-l,4-benzoquinol.

甲基。6。叶绿基。1，4-苯醌甲基转移酶是天然维生素E合成途径中的关键酶之一，催化MPBQ甲基化，生成DMPBQ。

On the basis of summarizing the current synthesis methods of Polydimethylsiloxane,we have successfully synthesized Polydimethylsiloxane by choosing the process of green solid acid as the synthesis method, Polydimethylsiloxane's synthesization is synthesized with D4 and MM as raw materials by three steps as retractation polymerization and equilibrium with titanium oxide as catalyzer.

我们在考察了目前现有的合成方法的基础上，选择了用绿色固体酸氧化钛做催化剂以八甲基环四硅氧烷(D4)和六甲基二硅氧烷为原料经缩合、聚合、平衡化三步反应来合成二甲基硅油。

N-methy-pyrrolidone is named as NMP for short and nitrogen heterocyclic ring compound.

N-甲基吡咯烷酮，又称N-甲基-2-吡咯烷酮或N-甲基-a-吡咯烷酮，简称NMP，属于氮杂环化合物。

This invention is directed to the-tartaric acid salt of 2-amino-N-{1-(2,4-difluoro-benzyloxymethyl)-2-oxo-2-3-oxo-3a-pyridin-2-ylmethyl-2-(2,2,2-trifluoroethyl-2,3,3a, 4,6,7-hexahydro-pyrazolo(4,3-c) pyridin-5-yl-ethyl}-2-methyl-propionamide which is a growth hormone secretagogue and as such is useful for increasing the level of endogenous growth hormone.

本发明涉及2－氨基－N－{1－－(2，4－二氟－卞氧甲基)－2－氧代－2－3－氧代－3a－(R－吡啶－2－基甲基－2－(2，2，2－三氟－乙基)－2，3，3a，4，6，7－六氢化－吡唑子基(4，3－c)吡啶－5－基－乙基}－2－甲基－丙酰胺的－－酒石酸盐，它是一种生长激素促分泌素，并且可用于提高内源性生长激素水平。

Additionally, the type of methyaltion changes in plants after seed and seedling irradiation were different.

另外，甲基化和去甲基化变化类型的分析也表明种子和幼苗辐射后发生甲基化变化的趋势也不相同。

Polydimethyl siloxane, polydimethyl siloxane, sodium acrylate/sodium acryloyldimethyl taurate copolymer, isocetane, sorbitan ester-80, PCA sodium, ethanol, menthyl lactate, spicery, Contain Bulgaria wild rose pistil extract with tendering formula, moisturize and nourish skin, strengthen the firmness and toughness of eye skin, and recover eye skin to moist, firm, tender and bright state.

环聚二甲基硅氧烷、聚二甲基硅氧烷、丙烯酸钠/丙烯酰二甲基牛磺酸钠共聚物、异十六烷，聚山梨醇酯-80、PCA 钠、乙醇、薄荷醇乳酸酯、香精、蕴含自保加利亚野生玫瑰精华成份调和而成的嫩肤配方，保湿滋养，增强眼部弹性及韧性，回复眼部肌肤柔润、富有弹性，令眼部肌肤幼滑紧致、水嫩柔润、神采明亮。

Molecularly imprinted polymers of sulfamethazine(SM 2 ) were prepared with silica gel as a sacrificial material, methacrylic acid and 4 vinylpyridine(4 Vp) as functional monomers, glycol dimethacrylate as crosslinker. The polymer properties were investigated by static adsorption experiments. Scatchard analysis shows that the adsorption ability of MAA MIP is superior to that of 4 Vp MIP. The dissociation constant of MAA MIP is 9 59×10 -4 mol/L. The value of apparent binding a...

以磺胺二甲嘧啶为模板分子，分别用甲基丙烯酸和4乙烯基吡啶为功能单体，二甲基丙烯酸乙二醇酯为交联剂，采用牺牲硅胶法合成了磺胺分子印迹聚合物，通过静态吸附实验，系统研究了不同单体对聚合物识别性能的影响；Scatchard分析表明，以甲基丙烯酸为单体的聚合物具有较高的吸附能力，其离解常数Kd为959×10-4mol/L，最大表观结合位点数Qmax为3070μmol/g。

To develop an eco-friendly epoxy impregnating resin system for groundwall insulation of large generators, the curing reaction mechanism has been fully studied, the formulation and the curing techniques have been optimized, and the influence of different constitution on the curing reaction, microstructure, and final performances have been studied and characterized.In this paper, influences of different reactive organo-siloxanes on the curing reaction and performances of epoxy V.P.I.

本文研究比较了含有环氧基、氨基或乙烯基的反应性硅氧烷，包括：γ-缩水甘油醚氧丙基甲基二乙氧基硅烷、β-(3，4环氧环已基)乙基三乙氧基硅烷、γ-缩水甘油醚氧丙基三甲氧基硅、β-(3，4环氧环已基)乙基三甲氧基硅烷、γ-甲基丙烯酰氧基丙基三甲氧基硅烷、乙烯基三乙氧基硅烷和苯胺甲基三乙氧基硅烷对环氧V.P.I。

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。