乙酯

In this paper, the innovative improvement of the cyclization and chlorination of quinoxaline was: 1. DHQX was prepared via reactingο-phenylenediamine with ethyl- oxalate in hydrochloric acid, the mixture was stired at 75-80℃for 2h.

本文对喹喔啉环合和氯代反应作了一些革新性的改进： 1、在环合合成DHQX时：以盐酸溶液为介质，邻苯二胺和草酸二乙酯在75-80℃进行环合反应约2h，即可得产物。

The effects of the ratio of chemical reagent and the reaction time on the mesostructure was also investigated.

考察了正硅酸乙酯的水解时间以及化合物的不同配比对材料形貌的影响。

Ribes nigrum L. seed oil1. to separate and syn-thesize γ-linolenic acid ethyl from Ribes nigrum L.

方法以黑加仑油为原料采用尿素包和、柱色谱法、酸催化法等联合方法分离及合成γ亚麻酸乙酯。

The method to calculate the rate constant of the acetic ether saponification is in this way improved in this paper.

对乙酸乙酯皂化反应实验数据处理方法进行了改进，该方法无须测定初始电导，避免了初始电导的测定误差给计算结果带来的影响对两组实验数据进行了计算，结果表明，该方法简单、易操作，并有较高的精

Result: Ethyl acetate extract of sappanwood can evidently reduce the content of CD4~+ of T cell and the ratio of CD4~+/ CD8~+, moreover have no infection on the content of CD8~+ of T cell.

结果：苏木乙酸乙酯提取物组同空白对照组相比能明显降低CD4~+T细胞含量并降低CD4~+/CD8~+的比值，而对CD8~+T细胞的含量无影响。

Ethyl acetate extract of sappanwood can reduce the content of CD4~+ of T cell and the ratio of CD4~+/ CD8~+ of spleen,possess determinate function on immuno-supression.

苏木乙酸乙酯提取物能降低正常小鼠脾细胞CD4~+T细胞含量并降低CD4~+/CD8~+的比值，具有一定的免疫抑制作用。且无量效关系。

Ethyl acetate extract of sappanwood is dilued with olive oil.use the equivalent dosage of active compound sappanwood 35g, 45g, 55g/kg to intragastric administration;blank control group use 0.2ml/10g olive oil to intragastric administration.

苏木乙酸乙酯提取物用橄榄油稀释，以相当于原药苏木35g、45g、55g/kg的剂量灌胃；空白对照组灌服同体积的橄榄油。连续灌胃8天后处死。

ABSTRACT:OBJECTIVETo investigate the effects of ethyl acetate extract of the selaginella tamariscina on vasotonia and its underlying mechanisms.

探讨卷柏乙酸乙酯提取物穗花杉双黄酮对血管紧张性的影响及其可能的机制。

MTT assays were used to evaluate effects of ethyl acetate and n-butanol extracts from Selaginella labordei on inhibiting cell proliferation. Flow cytometry was used to detect cell apoptosis rate.

利用MTT法检测细叶卷柏乙酸乙酯和正丁醇提取物对HeLa细胞生长的抑制作用，利用流式细胞术比较不同提取物对细胞凋亡的影响。

Methods: HPCE analysis was carried out on the ethyl acetate extracts of 18 Selaginella plants (from 11 species), using MECC separation model.

采用HPCE的MECC的分离模式，对 18个卷柏属植物样品的乙酸乙酯提取物进行测定。

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。