甲基化的

METHODS Phase-transfer catalytic methylation and suitable method of aftertreatment were used.

采用相转移催化法以硫酸二甲酯为甲基化剂进行α-甲基化反应，并采用适当的后处理方法。

The carboxymethyl soybean polysaccharides had been synthesized and the mechanical strength, solubility, bacteriostasis of algin, algin carboxymethyl soybean polysaccharides alloy membrane had been studied.

用氯乙酸作为羧甲基化试剂合成了羧甲基大豆多糖；测定了羧甲基大豆多糖、褐藻胶、褐藻胶-羧甲基大豆多糖合金膜的机械强度、溶解性；并对其肠溶性、抑菌性也作了探讨。

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。

Part I Cbx4 promotes SUMO modification of DNA methyltransferase 3a Dnmt3a is one of de novo DNA methyltransferases in mammals, which are responsible for the generation of somatic methylation patterns during embryogenesis and gametogenesis.

第一部分：Cbx4促进DNA甲基转移酶3a的SUMO化修饰 Dnmt3a是哺乳动物中的一个起始性甲基转移酶，负责在胚胎发育和配子发生过程中创建各类细胞的甲基化谱式。

In this paper,investigation has been made on the process for the synthesis of salicylaldehyde by esterification-oxidation with phenol,paraformaldehyde,boric acid as initial materials.

探索了以苯酚、硼酸和多聚甲醛为原料的酯化氧化法合成水杨醛的工艺路线，根据反应特点，改进了酯化反应方式，采用了多聚甲醛气态解聚法作为羟甲基化反应的进料方式，探讨了羟甲基化反应温度、多聚甲醛原料含水量、催化氧化反应催化剂用量对反应收率的影响并得到最佳反应条件，水杨醛收率为60.5%，纯度达98%以上。

Inhibition of SAHH has been known to result in accumulation of intracellular levels of AdoHcy, which is a potent inhibitor of all S-adenosyl-L-methionine-dependent transmethylation reactions.

抑制SAHH将导致细胞内甲基化抑制物AdoHcy的堆积，从而时转甲基反应产生反馈性抑制作用。而甲基化对于维持细胞的活性是必需的。

Inhibition of SAHH has been known to result in accumulation of intracellular levels of AdoHcy, which is a potent inhibitor of all S -adenosyl- L -methionine-dependent transmethylation reactions.

抑制SAHH将导致细胞内甲基化抑制物AdoHcy的堆积，从而对转甲基反应产生反馈性抑制作用。而甲基化对于维持细胞的活性是必需的。

"Acetylating H3K4 and demethylating H3K9 can actiate a gene; deacetylating H3K4 and methylating H3K9 can silence it," Karpen explains."Multiply modified at arious locations, these histones are a major factor in changing the functions of chromatin, independent of DNA sequence."

&H3K4的乙酰化和H3K9的去甲基化使基因活化；而H3K4去乙酰化和H3K9的甲基化则使基因沉默，& Karpen讲解道，&组蛋白的多部位多重调节是改变染色质功能的主要因素，并与DNA的序列无关&

The improved method of konjac glucomannan carboxy methylation was proposed in this paper according to the effects of deacetylation. Carboxymethyl KGM were synthesized by blending KGM with etherification agent first and then basifying and catalyzing in ethanol. Basifying first and then etherifying prepared traditional carboxymethyl KGM.

针对脱乙酰基的这种影响进行羧甲基化方法的改进，在乙醇介质中先混合醚化剂，再进行碱化催化反应制备羧甲基魔芋葡甘聚糖，并通过与传统的先碱化再醚化的KGM羧甲基改性方法比较，达到乙酰基脱出顺序上的不同。

In order to utilize lignin effectively, base on the situation in China, the study was carried on systematically, centering around the topic of two step sulfomethylation of the soda lignin of wheat straw (the first step is methylolation, the second is sulfonation) and its application. The main purpose is to develop a heterogeneous catalytic system which not only catalyzes but also homogenizes the lignin molecule in the reaction.

为真正高效利用碱木素，木论文根据我国实情，紧紧围绕着麦草碱木素两步磺甲基化（第一步为羟甲基化，第二步为磺化）及其应用这一主题，以开发出在反应过程中既可催化反应又能使木素分子均一化的多相催化体系为主要目标，系统地展开了研究。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。