查询词典 acid group

The first synthetic route uses 1,2,4-trimethoxybenzene and chloroacetonitrile in forming 2,4,5-trimethoxy-a-chlor-acetophenone under the anhydrous condition, then the intermediate condensates with papaverine forming the core pyrro[2,l-a]isoquinoline, followed by formation and lactonization to form the lactone ring. The second synthetic route uses prepared aldehyde with prepared ethyl nitroacetate by Knoevenagel condensation to obtain 2-Nitro-3-(2,4,5-tris-methoxy-phenyl)-acrylic acid ethyl ester and 2-Nitro-3-(2,4,5-tris-benzyloxy -phenyl)-acrylic acid ethyl ester etal intermediates. The lamellarin skeleton could arise from condensation of the papaverine and these intermediates by Michael reaction, the ester group is provided for subsequent lactonization. The third synthetic route uses coumarin or indan-l,3-dione derivatives and papaverine to form lamellarin under basic conditions.

第一条路线首先从1，2，4-三甲氧基苯出发与卤乙腈作用合成卤代芳酮中间体，然后与罂粟碱反应合成开链片螺素，最后经乙酰化、去保护、成内酯环得到片螺素；第二条路线由制备的芳醛和制备的硝基乙酸乙酯经缩合得到2-硝基-3-芳基丙烯酸乙酯，然后由该中间体与罂粟碱反应，在完成关环的同时也引入酯基，最后去保护、成内酯环得到片螺素；第三条路线是由香豆素或茚二酮出发，经溴代后的中间体与罂粟碱反应，得到片螺素的基本框架。

Become the pharmacodynamical functional group to realize the direct connection on body's endo-sugar with amino acid, and then to make the function of discharging lead after sugar taking amino acid into cell to complex with lead.

本论文选择葡萄糖和阿拉伯糖作为药动团，L-半胱氨酸等其它侧链氨基酸作为药效团，实现人体内源性糖和氨基酸的直接相连，从而发挥糖携带氨基酸进入细胞螯合排铅的作用。

Chlorine atoms were selectively introduced into the chlorin ring based on different reactivity between vinyl group at 3-position and 20-meso position by electrophilic addition and electrophilic substitution using hydrogen peroxide/hydrochloric acid, N-chlorosuccinimide, hydrogen chloride (or concentrated hydrochloric acid) as chlorinating reagent.

以过氧化氢/盐酸、N-氯代丁二酰亚胺、氯化氢为氯化剂，根据3-乙烯基和20-meso-位的不同化学反应活性，通过亲电加成和亲电取代反应，在二氢卟吩环上选择性地引进氯原子，完成8种未见报道的具有叶绿素-a基本碳架的氯代二氢卟吩衍生物的合成。

However, the capacity could be increased by rehydrating the adsorbent after calcination to increase the silanol group density [29] or by modifying the surface to incorporate functional groups, such as sulfonic acid groups, targeted for adsorption of the amino acid.

然而，能力可以增加补水后的吸附剂，以焙烧增加密度silanol组[ 29 ]或修改表面把功能组别，如磺酸群体，有针对性的吸附氨基酸。

However, the capacity could be increased by rehydrating the adsorbent after calcination to increase the silanol group density [29] or by modifying the surface to incorporate functional groups, such as sulfonic acid groups, targeted for adsorption of the amino acid.

然而，能力能增加补水后的吸附剂，以焙烧增加密度silanol组[ 29 ]或修改表面把功能组别，如磺酸群体，有针对性的吸附氨基酸。

The result of the study indicates that combining 40% sallower seed oil with 59% mixture of octadecadienoic acid and elaeosteric acid is the best compatibility of medicine to compare with high blood fat group.

试验结果证实了基础药效学研究的有效性，40%红花油与59%混合十八碳二、三烯酸及1%的维生素E组成的配方降血脂效果最好。

During the Great Proletarian Cultural Revolution, a "three-in-one" combination research group was organized from the workers, which formed the main-force, cadres and technical staffs of Silicen-Steel Sheet Works, Metallurgical Designing Institute and a research institute, for the recovery of sulphuric acid from the waste acid liquor of the steel works.

在无产阶级文化大革命中，由上海矽钢片厂、上海冶金设计院及中国科学院上海有机化学研究所组成的以工人为主体的工人、干部、科技人员三结合试验小组，对硅钢片酸洗废液通过用S-203强碱性阴离子交换膜扩散渗析法进行硫酸的回收，既节约物资，又改善环境，获得了较为满意的结果。

In order to solve the problem of the comprehensive utilization of acid tar,the acid tar is blended in coal for coke making in Meishan Iron and Steel Group Corporation.

为解决酸焦油的处理的问题，梅钢通过配煤炼焦试验，考察酸焦油配煤对配煤质量的影响和焦炭质量的影响，试验结果显示酸焦油配比为0。

In order to solve the problem of the comprehensive utilization of acid tar,the acid tar is blended in coal for coke making in Meishan Iron and Steel Group Corporation.

为解决酸焦油的处理的问题，梅钢通过配煤炼焦试验，考察酸焦油配煤对配煤质量的影响和焦炭质量的影响，试验结果显示酸焦油配比为0.5%时，焦炭质量有所提高。

Alkyl gallates can also low the extent of lipid peroxidation. To investigate the effects of PG and AG on livers that were injured by tetrachloride, we treamed small mice and fed them with different medicines, The conclusion is that AG and PG could scavenge free radical and protect mice livers from injuring by tetrachloride, AG was more effective than PG. 4. 3 The results of experiment for scavenging free radical of alkyl gallate in vitro showed that alkyl gallates can effectively scavenging free radical, but the parent gallic acid showed little effect. This suggested that introducing of hydrophobic group could significantly improve the anti-oxidative ability of gallic acid derivatives at large extent.

在体内没食子酸烷基酯的抗氧化效果大小顺序为：AG＞PG 4.3 体外清除自由基试验表明：没食子酸烷基酯可有效清除自由基，其能力远远大于母体没食子酸，说明引入脂肪链可相当程度上提高没食子酸衍生物的抗氧化能力。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。