甲基

Methods 2-Methacryloyloxyethyl phosphorylcholine was prepared by the reaction of phosphorycholine dichloride with 2-hydroxyethyl methacrylate.

方法以三氯氧磷、氯化胆碱和甲基丙烯酸-2-羟乙基酯为原料，合成含PC基团的聚合单体-2-甲基丙烯酰氧乙基磷酰胆碱。

When formaldehyde:dimethylamine is 2:1,the temperature of reaction is 55oC and the time of reaction is 2h, the ratio of production is the highest.

单体合成中探讨了羟甲基二甲胺的合成工艺，当甲醛：二甲胺为2：1，反应温度为55oC，反应时间为2h时，羟甲基二甲胺的收率最高；并通过NMR确定了其结构。

The method is characterized in that: mixture of macromolecular dihydric alcohol and a dihydroxybutyl-terminated polydimethylsiloxane is dehydrated, added with diisocyanate for reaction, then added with a bis propionic acid, a dihydric alcohol chain extender and a catalyst - dibutyl tin laurate, and is diluted by acrylic ester; temperature reduction and emulsion are performed on the mixture after reaction; chain extension reaction is performed in water by a multi-amine chain extender, and siloxane modified polyurethane dispersoid which contains acrylic ester monomer is prepared; and an initiator - potassium persulphate is added into the siloxane modified polyurethane dispersoid for emulsion polymerization.

特征是先将大分子二元醇与二端羟丁基聚二甲基硅氧烷的混合液脱水后加入二异氰酸酯，反应后加入二羟甲基丙酸、二元醇扩链剂和催化剂二月桂酸二丁基锡，并用丙烯酸酯进行稀释，反应后降温乳化，用多元胺扩链剂在水中进行扩链反应，得到含有丙烯酸酯单体的硅氧烷改性聚氨酯分散体，然后再通过加入引发剂过硫酸钾进行乳液聚合。

The relationship between molecular modification of erythromycin and NMR chemical shifts was summarized. It's noticeable that downfield of shifts of H-3 (△δ 0.2) after silylation and upfield of shifts (△δ-0.4) after methylation. No changes were observed after methylation.

分析总结了红霉素分子修饰与核磁共振化学位移变化之间的关系，并且发现大环上H-3硅烷化后由高场移至低场（△δ为0.2），甲基化后又由低场移至高场（△δ为-0.4），变化均较大；而且一旦甲基化后H-3化学位移在高场几乎不再变化。

Statistical evaluation was performed by using x~2 test and Fishers exact test for enumeration data and independent t test for measurement data to assess relationship of methylation between pancreatic neoplasm.

在从胰腺炎、IPMN至胰腺癌的进程中，NPTX2基因高甲基化阳性率逐渐加深，提示NPTX2基因可能参与胰腺癌进展，其高甲基化导致的基因沉默可能是导致胰腺癌的原因之一。

DNA methylating inhibitor has been used in the study of epigenesis that caused by DNA methylation of plants.Also,it can be instead of low temperature treatment to induce flowering of plants,make flowering time earlier than usual.Further study and application in the improvement of plants will be continued.

DNA甲基化抑制剂已被用于因DNA甲基化引起的植物表观遗传研究中，同时它可以代替低温促进植物提早开花，并可能在植物性状改良中得到进一步的研究和应用。

It was studied in this thesis the preparation of Artemisia glue, under the condition of alkali, chloroacetic acid was used as etherification agent and the properties, structures and application in quick-frozen dumpling were researched too.

本论文主要研究了以沙蒿胶为原料，氯乙酸为醚化剂，在碱性条件下合成羧甲基沙蒿胶的工艺，并研究了羧甲基沙蒿胶的性质、结构及其在速冻水饺中的应用。

It was discussed that the main factors having effect on the vulcanization time of RTV block methyl silicone rubber, such as the mol ratio of ethoxyl and silicone hydroxyl, the pH value of methyltriethoxysilane, and the content of iron ions impurity in methyltriethoxysilane, temperature, moisture, and the quantity of catalyst.

讨论了影响甲基嵌段室温硫化硅橡胶硫化时间的主要因素，如：乙氧基与硅羟基的量之比，甲基三乙氧基硅烷低聚物的pH值、铁离子的含量，以及温度、湿度和催化剂的用量等；并介绍了预防和控制这些影响因素的方法。

In this paper the surface charge density of cationic kraft pulp was chosen as response variable and the preparation conditions of cationic kraft pulp by the in-situ grafting copolymeration of acrylamide and cationic monomer, [2- ethyl] trimethyl-ammonium chloride were optimized by central composite design.

摘 要：以阳离子硫酸盐浆的表面电荷密度为评价指标，采用中心复合设计法对丙烯酰胺和甲基丙烯酰氧基乙基三甲基氯化铵接枝共聚制备阳离子硫酸盐浆的工艺进行了优化。

The eucalyptus pulp was grafted by cationic monomer of methacryloyloxy ethyl trimethylammonium chloride under microwave irradiation.

摘 要：微波辐照下采用甲基丙烯酰氧乙基三甲基氯化铵接枝共聚制备改性桉木浆。

My first article for Screen Power Magazine, which is to this day is the official magazine of Jackie Chan, was a DVD review of the Hong Kong actioner Gen-X Cops, starring Nicholas Tse and Daniel Wu.

我的第一篇文章为屏幕力量杂志，在对这天是Jackie Chan 正式杂志，是香港actioner Gen X 警察的DVD 回顾，担任主角Nicholas Tse 和丹尼尔吴。

His lips grazed hirs, Now what are you going to do?

他的唇使吃草了 hirs，现在你将要做什麼？