催化作用

The results showed that coniferin could completely polymerize with model compound of β-O-4 type lignin to form lignin macromolecule. The M of the polymerized product was much higher than the starting materials.

研究表明：在漆酶的催化作用下木质素前驱物松柏醇－β-D-葡萄糖苷与木质素模型物能很完全的发生聚合，产物中不存在起始物的晶体，M也大大的增加了。

To effectively enhance the contraposition selectivity of chlorinating reaction the p-chlorotoluene was prepared by direct chlorination of toluene and chlorine gas in the presence of zeolite catalyst.

为了有效提高甲苯氯化反应的对位选择性，研究了在分子筛催化作用下甲苯与氯气直接氯化制取对氯甲苯。

The adsorption of urea nitrogen onto dialdehyde cellulose under catalysis of immobilized urease in gelatin was studied in batch system.

研究了在固定化脲酶催化作用下双醛纤维素对尿素氮的吸附平衡和动力学。

Ascorbate is concomitantly oxidized to monodehydroascorbate. Some monodehydroascorbate radicals are re-reduced in a reaction catalyzed by monodehy- droascorbate reductase, but the remainder undergoes spontaneous dismutation to ascorbate and dehydroascorbate.

在抵抗氧化胁迫的反应中，抗坏血酸自身被氧化为单脱氢抗坏血酸，一部分单脱氢抗坏血酸在单脱氢抗坏血酸还原酶的催化作用下还原为抗坏血酸，另一部分单脱氢抗坏血酸的在歧化作用下被不成比例地还原为抗坏血酸或氧化为脱氢抗坏血酸。

The effects of reaction parameters such as temperature, pressure, and hydrogen to hydrocarbon ratio (H2/HC) on the hydroconversion of methylcyclopentane over Pt/HZSM-5 have been investigated in a fixedbed downflow reactor.

在连续流固定床反应装置上，考察了反应温度、压力及氢烃摩尔比等条件对甲基环戊烷临氢转化反应活性及扩环反应选择性的影响；结合反应评价结果和热力学分析，探讨了Pt/HZSM-5催化作用下MCP的扩环反应规律。

The results show that the energy barrier with the two watermolecules reaction drops about 25% compared with that of onewater molecule reaction.

冰表面对〓反应的催化作用对〓与一水和二水的反应进行了计算，优化出了络合态及过渡态。

An enzyme that catalyzes the oxidation of many body compounds e.g., epinephrine and ''.

对体内化合物的氧化有催化作用的酶（如：肾上腺素、降肾上腺素、五羟色胺）。

In thes subject, I have analyzed the developing conditions of esculen packing inland and overseas, according to ourselves level, adopting cheap bean dregs as material, using biological zymolysis technology, biological protease and lipase as catalyzer and through the catalysis of enzyme tO make soybean fibre of bean dregs and then form new esculent packing.

本课题通过分析国内外可食性包装的发展状况，结合我国的实际情况，采用价格低廉的豆渣为原料，运用生物发酵技术，以生物蛋白酶、脂肪酶为催化剂，经酶的生物催化作用提取豆渣中的膳食纤维，制成新型可食性包装。

After esterification, the ethyl-2-chloro-3-phenylpropionate reacts with diethyl malonate under the catalysis of sodium ethylate, and we obtain the corresponding triethyl ester. The-benzylsuccinic acid is formed by the triethyl ester reacting with concentrate hydrochloric acid and taking place hydrolyzation and decarboxylation reaction at the same time. In order to avoid the formation of cinnamic acid, the sodium ethylate and diethyl malonate must be react sufficiently. The course has simple operation, inexpensive materials and better yield.

具体制备工艺为：首先以L-苯丙氨酸为原料采用重氮化方法得到-2-氯-3-苯基丙酸，再经酯化得到-2-氯-3-苯基丙酸乙酯后在乙醇钠催化作用下和丙二酸二乙酯缩合，发生SN2反应，得到相应的三乙酯，然后经水解和脱羧，得到-苄基丁二酸；在实验中乙醇钠要和丙二酸二乙酯充分反应，避免生成肉桂酸乙酯；该过程操作简单，原料便宜，产率较高，总收率可达到26.8%。

It was found that gold nanoparticles quench the fluorescence of fluorescein sodium in water.

第五章实验发现水溶液中金纳米微粒对NaBH_4还原亚甲基蓝的反应具有显著的催化作用。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。