methyl group

The influence of methyl group on the structure and properties of poly-o-methylaniline

甲基对聚邻甲苯胺结构和性能的影响

The contents of Methyl group on the membrane surface play a decisive role in the improvement of hydrophobic properties of carbon membranes .

表面甲基基团含量对提高膜表面疏水性能起到决定性作用。

IR and Raman spectroscopic also provide indirect evidence of the interaction between CO2 and methyl group .

另外，通过红外及拉曼光谱测试对甲基基团与二氧化碳之间的相互作用进行了证明。

Conclusion Introducing the methyl group or a low alkyl group resulting in the high selectivity and increase of its activity .

结论甲基或低级烷基的引入导致了高选择性，使其活性增大。

Complexes of cecl_ 4 with pyridine n - oxide and its methyl group derivatives

四氯化铈与吡啶氮氧化物及其衍生物的配合物的合成和性质

Syntheses of some flavonoid compounds with 3 ' - or 4 ' - substituted methyl group

3′或4′甲基取代的黄酮类化合物的合成

The chemical properties of bromomethyl quaternary ammonium salts are changed drastically when compared with the methyl group counterpart .

本论文发现，在三级胺中引入溴甲基（简称溴甲基季铵盐），可以使季铵盐的性质发生很大的变化。

Assume the geometry of the eclipsed form to be that given by rigidly rotating one methyl group with respect to the other .

假定重叠式的几何形是由一个甲基相对另一个甲基做刚体转动而得。

The methyl group ( CH3 ) attached to the methionine sulfur atom in SAM is chemically reactive .

甲基基团（CH3）附着在SAM中蛋氨酸硫原子具有化学反应性。

Currently , exogenous SAM is used to treat cholestasis in clinical . Its mechanism relates to SAM providing methyl group and transferring sulphur .

目前，外源性的SAM在临床上主要被用于治疗各种病因引起的肝内胆汁淤积，其机制与SAM提供甲基和转硫基作用相关。

Catalytic Study on Hydrogenation of Carbonyl Group into Methylene or Methyl Group by Silica-supported Poly ( acrylonitrile-vinyltriethoxysilicon ) Palladium (ⅱ) Complex

二氧化硅负载聚（丙烯腈－乙烯基三乙氧基硅）钯（Ⅱ）络合物对羰基氢化还原成甲基或亚甲基的催化研究

The results show that the organic liquids with high dielectric constants , small viscosities and the methyl group bonding to the polar group are appropriate carbon sources .

结果表明有高介电常数、低粘度、分子中甲基基团直接与极性基团键合的有机液体是合适的沉积碳源；

As an electrophilic agent , the methyl group of methoxy species can directly attack benzene ring to produce toluene via electrophilic substitution reaction .

甲氧基物种的甲基作为一种亲电试剂，可以直接进攻苯环发生亲电取代烷基化反应生成甲苯。

Yin-tonic Effects of Timosaponin Aglycone with Stereoisomeric Change of C-25 methyl group on Hyperthyroid mice

知母甾体皂甙元C-25甲基立体异构对滋阴作用的影响

Substitution of methyl group at 1,2 and 3 position on 1-methylindole , 2-methylindole and 3-methylindole inhibits initial microbial attack significantly .

同时，1、2或3位上的甲基替代使1甲基吲哚，2甲基吲哚和3甲基吲哚的降解受到严重抑制。

Chloromethylation of polystyrene-divinylbenzene resin ( Merrifield resin ) with chlorine methyl group is very easy to react with nucleophiles .

氯甲基化的聚苯乙烯-二乙烯苯树脂（Merrifieldresin）中的氯甲基基团很容易与亲核试剂发生反应。

Fluorescence and ESMS determination showed that complex I of an additional methyl group results in the higher stability than complex II , which makes complex I be more suitable for fluorescence cell imaging .

荧光光谱和电喷雾质谱实验表明配合物Ⅰ氨基上的取代甲基使得该配合物比Ⅱ具有更好的稳定性，更有利于细胞造影研究。

The results indicate that for NHn ( CH ) 4-n series , the less n is , that is to say , the more the methyl group , the worse stable it is .

结果表明，对NHn（CH3）4－n系列分子，n越小，即甲基越多，里德伯分子越不稳定。

DNA methylation is the only known covalent modification of DNA molecule . It is accomplished by transfer of the methyl group from S-adenosyl methionine to 5 position of the purine ring of cytosine .

DNA甲基化（DNAMethylation）是目前已知的唯一天然的DNA共价修饰方式，由DNA转移酶催化，将S-腺苷甲硫氨酸上的甲基转移到胞嘧啶嘌呤环的第五位碳原子上。

The simulation results suggested that the EVAP showed significant effects on the nucleation and growth of the paraffin crystal when the acetate concentration was around 30 % and there existed one branched methyl group near the acetate group in each block .

在各种乙烯醋酸乙烯丙烯（EVAP）降凝剂中，当EVAP酯含量在30%左右，且在每个链段含有一个靠近酯基的甲基支链时容易在蜡晶的成核和生长过程中发挥作用。

DNA methylation patterns are established and maintained by DNA methyltransferases , which catalyze the transfer of the methyl group from S-adenosylmethionine ( SAM ) to C - 5 position in the pyramiding ring of cytosine .

DNA甲基化就是在DNA复制后，甲基转移酶（甲基化酶）催化将S-腺苷-甲硫氨酸上的甲基基团连接到DNA分子的胞嘧啶碱基上，进行DNA修饰的过程。

Mass spectra has showed that it is easy to lose a methane molecule and a methyl group from each molecular ion in RD forming a conjugated ion ; both di - and tripolymer often crack into a derivative ion of the dipolymer .

质谱分析表明：RD容易失去甲烷分子和甲基形成共轭体的离子，二聚体和三聚体容易形成二聚体的衍生物离子。

Experimental results show that C4-C14 bond of cyclopentadiene-menadione adduct is weakened by the steric effect of its angular methyl group through the crystal structural analysis . Consequently , the retro-Diels-Alder tendency of the adduct is enhanced at 130 ℃ through thermal analysis ( TG-DSC ) .

晶体结构分析显示环戊二烯-甲萘醌加合物的C4-C14键被它的角甲基空间效应所弱化，热分析（TG-DSC）研究显示在130℃该加合物的逆Diels-Alder反应趋势得到加强。

The content of methyl functional group of humus is an important index to evaluate the humification of soil .

胡敏酸甲氧基功能团的含量多寡是衡量土壤腐殖质化的重要指标。

The relative removal rate of methyl and methylene group showed the shape of M with the increase of temperature .

甲基与亚甲基的相对脱除速率随温度呈现M型关系。

Proton NMR studies of 2-Zn insulin assignment of methyl and methylene group resonances from two-dimensional spectra

二锌胰岛素质子二维核磁共振谱的研究&甲基，亚甲基共振峰的确定

Two - Dimensional NMR methods were used to assign methyl and methylene group resonances in the NMR spectra of 2-Zn insulin .

用二维核磁共振的方法确定二锌胰岛素质子核磁共振谱中的甲基，亚甲基基团共振峰。

In chemical reaction , dioxide selenium , as gentle oxidant , can oxidized some group , such as hydroxide , methyl to aldehyde group , and was reduced to selenium itself .

在化学反应中，二氧化硒作为温和的氧化剂，可以将羟基、甲基等基团氧化为醛基，而本身被还原为硒，成为废弃物。

Conclusion The curative effect of anti-poison therapy in PVX group is better than that in pyradoxime methyl chloride + Atropine group .

结论PVX组抗毒治疗疗效明显优于氯磷定+阿托品组。

PVX treatment group could make brady-arrhythmias recovering to sinus rhythm within 10 min and could keep 2 h to reach salvage ending , while pyradoxime methyl chloride + Atropine group needed 20 ~ 30 min to recover sinus rhythm and one cases of ventricular fibrillation died .

PVX治疗组可在10min内使缓慢性心律失常完全恢复窦性心律，并维持2h，至抢救结束。氯磷定+阿托品治疗组恢复窦性心律需要20~30min，有1例室颤死亡。