乙酸的

Was synthesized from cyanoacetic acid and diethylamine via DCC coupling under mild conditions.

中间体5 的制备由氰基乙酸在二环己基碳二亚胺作用下经酰胺化一步制得，条件温和，收率较高，避免使用剧毒的氰化钠。

Two synthetic routes of Caffeine have been determined and investigated after the analyzing and trying for the literal synthetic methods. In one route, the target compound was prepared from chloroacetyl chloride through six steps, the total yield is 50.5 %. In another route, the target compound was obtained from cyanoacetic acid through six steps, the total yield is 45%.

对目前咖啡因工业生产工艺进行了研究，并分析了咖啡因工业生产中所存在的问题，本文提出两条可行的工业化合成路线：一条是以氯乙酰氯为起始原料，经过六步反应制得目标化合物，总收率50.5％；另一条是以氰基乙酸为起始原料经过六步反应制得目标化合物，总收率45％。

In recent years, can be polymer powder, sodium diacetate and fill the production of such products in the domestic construction materials, food industry with Chinese-made blank.

近年可再分散乳胶粉、双乙酸钠的投产又填补了此类产品在国内建材、食品行业无中国制造的空白。

An overall activity determination using the fluorescein diacetate hydrolysis method as described by Fontvieille et al.

在MBR和AS法的混合液和出水中对酶的活性进行考察，分成两个部分：1使用双乙酸荧光素水解法FDA研究酶活性（Fontvieille et al。

Optimal process conditions for preparing 2-oxo-1, 4-piperazine diacetic acid(3-KP): 2-oxo-1-piperazine acetic acid was combined with chloroacetic acid at a mole ratio of 1 to 1.1, at temperature 40℃for 8 hours.

通过单因素分析，合成3-KP 的最佳反应条件为：反应温度为40℃，反应时间为8 小时，氯乙酸∶S-KP 的摩尔比为1.1∶1。

AIM: To investigate the effect of PD98059, a specific repressor of extracellular signal regulated kinase1/2 (ERK1/2), on the proliferation of the murine lymphocytes. METHODS: Lymphocytes were isolated from lymphoid nodes of BALB/c mouse. After stained with carboxy fluorescein diacetate, succinimidyl ester, the cells were stimulated with polyclonal activators, concanavalin and phorbol 12,13 dibutyrate plus ionomycin.

分离小鼠淋巴结细胞，藉羧基荧光素乙酰乙酸染色，用多克隆刺激剂刀豆A蛋白或者佛波醇酯加离子霉素刺激，以流式细胞术分析PD98059对淋巴细胞增殖的影响；利用碘化丙锭染色分析PD98059对细胞周期的影响。

Cu/ZrO2 catalyst prepared by coprecipitation was used for synthesis of iminodiacetic acid from diethanolamine via dehydrogenation.

用共沉淀法制备的Cu/ZrO2催化剂进行二乙醇胺催化脱氢合成亚氨基二乙酸，分别考察了催化剂用量、原料配比、反应温度、反应压力和反应时间等因素对反应的影响。

The thermal decomposition of the copper acetate dihydrate in a static air atmosphere was investigated by TG-DTG techniques.

用TG-DTG技术研究了一水合乙酸铜在静态空气中的热分解过程，根据TG曲线确定了热分解过程中的中间产物及最终产物，其分解过程主要由2步组成。

Pharmaceutical characteristics of dimethylamino ethyl(4-chlorophenylmethfoxy )acetate hydrochloridein rabbit was studied and several parameters at different timeand way of medicine administration were determined.

研究了4－氯代苯甲氧基乙酸二甲氨基乙酯盐酸盐在家兔体内的药代动力学，测定了不同时间不同给药方式家兔体内的血药浓度及动力学参数。

Pseudolaric acid B is a diterpene acid isolated from the root bark of Pseudolarix Kaempferi Gorden, and exerts potent antifungal, antimicrobial and antifertility activities.

土槿皮乙酸是从松科植物金钱松的根皮中分离的二萜酸，具有抗真菌、抗肿瘤、抗生育等作用。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。