催化作用

In the medium of H_2SO_4 and catalyzed by potassium bromide, iodate can oxidize and decolorize methyl orange very well.

基于硫酸介质中，碘酸根在溴化钾的催化作用下对甲基橙有较好的氧化褪色作用。

The results showed that there was a distinctly different effect on urease activity by the three different herbicides.

脲酶在尿素转化过程中起关键作用，当尿素施人土壤后，在脲酶的催化作用下，迅速分解成COz和NH。。

The purpose of this project is to develop some new azonium moleculars and to investigate the anion recognition, enantioselective recognition and supramolecular catalysis of azoniums.

本项目按申请研究内容在设计合成新型氮鎓分子，研究它们对客体的识别作用及超分子催化作用等方面取得一系列创新结果。

The calculated result shows that three reactions belong to exothermal reactions.And the decomposition activation energy in the HF catalyst is the smallest , the decomposition of H2CO3 in the role of HF is the most easily.

计算结果表明3 个反应都是放热反应，且分解反应的活化能在HF 催化作用下最小，说明H2CO3 的分解在HF 作用下最容易进行。

We have presented a practical method for the preparation of propargylic alcohols from terminal alkynes and carbonyl compounds promoted by KOH in the presence of 18-crown-6,and subsequent efficient cyclizations of propargylic alcohols with 2-naphthol catalyzed by InCl_3·4H_2O under the solvent-free ball-milling conditions.Ball milling exhibits its superiority over the reported methods in the preparation of propargylic alcohols and naphthopyran derivatives.

采用机械研磨方法进行了连续的两步固相化学反应的研究：首先，在氢氧化钾和18-冠-6的作用下，端基炔和羰基化合物在机械研磨条件下反应可以高效地生成相应的炔醇化合物；其次，在四水合三氯化铟的催化作用下，生成的炔醇化合物和2-萘酚在机械研磨条件下环加成生成相应的萘并吡喃产物。

Using 1,4-dibromobenzene,1,3,5-tribromobenzene and 2-methyl-3-butyn-2-ol as starting materials and PdCl2,triphenylphosphine,CuI and KOH as catalysts,1-bromo-4-ethynylbenzene,1,4-diethynylbenzene and 1,3,5-triethynylbenzene were synthesized by Sonogashina coupling reaction and elimination reaction.

以对二溴苯、1，3，5-三溴苯和2-甲基-3-丁炔-2-醇为原料，在PdC l2、PPh3和CuI的催化作用下进行Sonogash ina偶联反应，偶联产物在KOH作用下发生消去反应，分别得到对溴苯乙炔、对二乙炔基苯、1，3，5-三乙炔基苯。

An enzyme that catalyzes the removal and transfer of hydrogen from a substrate in an oxidation-reduction reaction.

脱氢酶一种酶，能在氧化还原反应过程中，对脱去作用物中的氢并转化氢起催化作用

Comparing with chicken egg-white lysozyme which is widely used in clinic, hLYZ has many advantages: it is a natural protein in human body, so it is safe and harmless when used as a drug; its bioactivity to kill bacterium is three times higher than chicken egg-white lysozyme, and its thermal stability is much higher, too; it also has many other specific important functions which are not related with its catalysis, such as anti-virus and anti-tumor and improving immunization.

人溶菌酶与目前临床上应用最多的鸡蛋清溶菌酶相比具有以下优势：人溶菌酶是人体内的蛋白，具有天然的相容性，没有毒性和副作用；人溶菌酶比鸡蛋清溶菌酶的杀菌活性高3倍，而且热稳定性也要远高于鸡蛋清溶菌酶；人溶菌酶还有多种特有的与其自身的催化作用无关的理化作用，如抗病毒和抗肿瘤。

AtDFA is dihydrofolate synthase localized in mitochondria, it catalyzes one glutamate added to the dihydropteroate and produces dihydrofolat. AtDFB, AtDFC and AtDFD are folylpolyglutamate synthase localized in plastid, mitochondria and cytosol respectively. A short chain ofγ-linked glutamates can be added by FPGS.Folate molecules exist in vivo mainly as polyglutamates and these are preferred by folate-dependent enzymes.

AtDFA为二氢叶酸合成酶(dihydrofolate synthase，DHFS)，定位于线粒体，在它的催化作用下，一个谷氨酸分子与二氢蝶酸(dihydropteroate ， DHP)相结合，形成二氢叶酸；AtDFB、AtDFC、AtDFD为多聚谷氨酸合成酶(folylpolyglutamate synthase，FPGS)，分别定位于质体、线粒体和细胞质，在多聚谷氨酸合成酶的作用下，谷氨酸分子可以逐一连接到四氢叶酸的谷氨酸γ位。

Additional studies have now shown that enzymatic reactions in which catalytic RNAs, termed ribozymes, play a role are very widespread.

现在进一步研究表明被称为核酶的具有催化作用的RNA，有着广泛的作用。

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。