酸化的

Experimental results show that esterification reaction proceeds effectively at 200℃ with ferric sulfate as catalyst.

论文研究选用硫酸铁作酯化反应的催化剂，在醇酸摩尔比10：1.0，酯化温度200℃，酯化时间2小时。

The chemical constituents of extracts of Tamarindus indica L were determined by GC-MS. The relative contents of constitutes were determined by area normalizing method. 48 compounds were identified, amounting to total mass fraction 98.5%. The main compounds were 5-methyl-2(3H)-furanone, diethyl succinate, furfural, hexadecanoic acid, linolenic acid, 5-methylfurfural, oleic acid, linoleic acid, etc.

并利用气相色谱仪-质谱仪对罗望子萃取物的化学组成进行了分析鉴定，并用面积归一化法测定了各种成分的质量分数，共鉴定了48种成分，占总质量分数为98.35%，其中主要成分为：5-甲基-2(3H)-呋喃酮、丁二酸二乙酯、糠醛、十六酸、亚麻酸、5-甲基糠醛、油酸、亚油酸等。

Results The synthesis condition was improved. The method of methane sulfonic acid/DL-methionine was found an ideal substitute of BBr3 for less cost. While using hydrobromic acid, the O-demethylation and hydrolyzation could be combined in one stage.

结果 优化了纳洛酮的合成工艺，甲磺酸／DL-甲硫氨酸法试剂价格低廉，可降低生产成本；而氢溴酸法不但试剂价格更低，还可将去氧甲基化和水解合并为一步反应，使新工艺的总收率提高到59.90%，产品质量符合中国药典。

With LaCl_3·7H_2O as catalyst to replace conventional liquid inorganic acid,and the esterificationbetween isobutyric acidand n-butyl alcohol as a probe reaction,the optimum conditions were investigated and various isobutyrate s were synthesized over it in this paper.

7H2O替代传统液体无机酸为催化剂，以合成异丁酸正丁酯为探针反应考察催化酯化反应的优化条件，并在此条件下合成了多种异丁酸酯，比较了不同催化剂对催化合成异丁酸正丁酯的影响。

Based on our intensive studies on the lactonization of oligo/polysialic acids, we proposed for the first time that the lactone-ring formation of oligo/polysialic acids has three stages. We also provided a novel model to explain the conformational changes of oligo/polysialic acids caused by the repulsing forces among the carboxyl groups of sialic acid residues. Our results should provide novel approaches for further investigation of the structural-functional relationships of oligo/polysialic acids.

在对多/寡聚唾液酸内酯化过程进行深入研究的基础上，于国际上率先提出多/寡聚唾液酸内酯的形成具有三个阶段的观点，并首创性地提出了羧基排斥所致多/寡聚唾液酸分子空间构象改变的模型，为深入研究多/寡聚唾液酸结构与功能的关系提供了新生长点。

Mainly engaged in sodium azide, barium azide, three phosphorus nitride Friday, phenyl isothiocyanate, 1 - phenyl -5 - mercapto-tetrazole, 4 - dimethylamino-pyridine, 2 - mercapto--5 -- methyl-1,3,4 thiadiazole, N-hydroxy phthalimide, anhydrous betaine and betaine hydrochloride, such as fine chemical raw materials and medicine, pesticide intermediates of the development, production and sales.

主要从事叠氮化钠，叠氮化钡，五氮化三磷，异硫氰酸苯酯，1-苯基-5-巯基四氮唑，4-二甲氨基吡啶，2-巯基-5-甲基-1，3，4噻二唑，N-羟基邻苯二甲酰亚胺，无水甜菜碱及甜菜碱盐酸盐等精细化工原料及医药、农药中间体的开发、生产和销售。

Objectives and methods: The present study is undertaken to examine our hypothesis that with the accumulation of ion channels, increased sialic acids at the injury site or DRG somata result in a reduction of net transmembrane potential that evoke ESD in injured neurons.

膜蛋白的一个共同特性是其膜外域接受密集的糖基化，糖基含有大量带负电的唾液酸，如大部分离子通道，特别是电压依赖性的钠通道含有大量的唾液酸，而且这些负电荷靠近钠通道的电压感受器而易化通道开放。

As to the high polarity, high boiling point resultant—trimesic acid, the analysis methods of infrared spetrum, gas chromatography-mass spectroscopy, vapour-phase chromatography, acid number titration and so on are seperately used to characterize its property. Infrared spetrum and gas chromatography-mass spectroscopy are used to have a qualitative analysis on the resultant and are compared with the stand diagram. Sulfuric acid-methanol esterification and rapid esterification are used to prepare the trimesic acid trimethyl-ester and have a FID quantitative analysis. So that we make sure the purity of trimesic acid in the resultant and also we have an acid alkali titration on the resultant to get its acid number, in order to verify the purity of trimesic acid in the resultant.

对于高极性、高沸点的固体产物均苯三甲酸，分别采用红外光谱、气质联用、气相色谱、酸值滴定等分析手段进行了表征：利用红外光谱、气质联用的方法进行产物的定性分析，并与在同一仪器、同一条件下做出的标准谱图进行比对；采用硫酸-甲醇酯化法和快速酯化法制备出均苯三甲酸三甲酯，对其进行气相色谱FID定量分析，进而确定固体产物中均苯三甲酸的纯度；用酸碱滴定法确定固体产物的酸值，以对固体产物中均苯三甲酸的纯度进行验证。

Rats in the treatment group were injected with 10 μL of human insulin of rapid gene synthesis （1 ×10%5 U/L）immediately after unclamped the bulldog clamp and reperfusion, while rats in the sham-operation group and control group were injected with normal saline at the same volume.

分别于全脑缺血再灌注1，3，5d，假手术组（1只／时相点）、缺血对照组（6只／时相点）、胰岛素治疗组（6只／时相点）大鼠断头取脑，行免疫组化染色，光镜下观察海马CA1区神经元酪氨酸羟化酶和多巴胺-β-羟化酶表达的变化。

Drug intervention groups received either daily inhalation of budesonide, ipratropine or heparin respectively, starting on the 8th day or TGF-β1 monoclonal antibody(TB21)0.5 mg twice (6th and 19th day) via the tail veinous injection.

其它各药物干预组于制作模型第8 d起分别雾化吸入布地奈德（布地奈德组，12只）、溴化异丙托品（溴化异丙托品组，12只）和肝素（肝素组，6只）溶液。4周后检测小支气管平滑肌及胶原厚度，用免疫组化法及原位杂交法观察各生长因子在支气管肺内的表达，用放免法检测血清和BALF中细胞外基质成分Ⅲ型前胶原、层粘连蛋白及透明质酸。

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。