催化作用

Ethyl phenoxyacetate has been synthesised by the reaction of phenol with ethyl chloroacetate under the condition of solid-liquid phase transfer catalysis using PEG-400 as the catalyst.

于固一液相转移催化条件下，以PEG-400为催化剂，通过苯酚与氯乙酸乙酯反应合成了苯氧基乙酸乙酯。与85％的水合肼作用得到相应的酰肼。

Isoamyl chloroacetate is synthesized from chloroacetic acid and isoamyl alcohol with mordenite as catalyst and benzene as water carrying agent under the irradiation of microwave.

研究了微波辐射作用下丝光沸石催化氯乙酸与异戊醇的酯化反应。

Meanwhile, the promotion effect of ultrasonication on the catalytic performance was also discussed based on the selective hydrogenation of cinnamaldehyde to cinnamyl alcohol.

同时，还讨论了超声对肉桂醛选择性加氢制肉桂醇催化性能的促进作用。

The preparation condition for Co-Fe/diatomite catalysts for selective hydrogenation of cinnamaldehyde to cinnamyl alcohol was studied and improvement of properties of the catalysts by preparation under ultrasonic irradiation was discussed.

对肉桂醛选择加氢制肉桂醇的Co-Fe/硅藻土催化剂的制备条件进行了研究，并对超声波作用下制备的催化剂的催化性能优化进行了探讨。

A dose-dependent inhibition of cGMP-PDE activity was observed when cUMP 10~(-6-10~(12) M was added to the culture medium, which may explain the increase of the level of intracellular cGMP, while the activity of cAMP...

浓度为10~(-6)-10~(-12)McUMP对胞内cAMP-PDE活性几乎没有影响，而抑制cGMP-PDE的活性，抑制作用随cUMP浓度降低而减小，这可能是胞内cGMP水平增高的原因。cUMP可能与细胞的cAMP PK结合，释放催化亚单位，细胞生长的抑制可由此发生。

Although the biological significance of DNA methylation has been recognized to some extent, the mechanisms of DNA methylation regulation and of the establishment of tissue-specific DNA methylation pattern in somatic cells are still unclear, since the knowledge of the enzymes responsible for de novo DNA methylation and demethylation of DNA is very limited and up to now only two functional DNA methyltransferases in mammals have been cloned.

目前，虽然对DNA甲基化的作用已有一定认识，但DNA甲基化的调节以及发育过程中组织特异的DNA甲基化谱的建立机制还不清楚。问题主要在于对催化重新甲基化和去甲基化反应的酶的了解很少。至今仅克隆出两种有功能的哺乳动物DNA甲基转移酶。

According to the structure and property of feather fibre fabric and the sizing ingredients,choosing the biological catalyst-enzyme which has high catalysis efficiency and undivided reactivity,to desize the feather fibre fabric ,the paste would be removed quickly and efficiently.

在羽毛纤维织物结构性能基础上，结合织物上所含浆料的组成，选择催化效率高、反应专一的生物催化剂酶对羽毛纤维织物进行退浆处理，可以快速、高效退除织物上的浆料，同时酶退浆时反应条件温和，不需要高温、高压、强酸、强碱的作用条件；采用超声波对羽毛纤维织物进行退浆可以缩短处理时间、降低处理温度，减少药剂用量，而处理效果优于常规法退浆。

The oxidative degradation and the kinetics of 1,5-naphthalene disulfonic acid in supercritical water was investigated using Mn2O3 /γ-Al2O3 as catalyst.

在SCWO体系中引入催化剂，通过催化剂的作用提高反应速率、缩短停留时间、降低反应温度和压力的催化超临界水氧化法则是当前的研究重点。

The results showed that 1,5-naphthalene disulfonic acid could be degradated effectively by the catalytic supercritical water oxidation process,the removal rate of COD reached 98% or even above;the removal rate of COD increased with the increasing of temperature and residence time,the orders of catalytic oxidation degradation reaction of 1,5-naphthalene disulfonic acid to COD and oxygen in supereritieal water were 0.89 and 0.28 respectively,and the activation energy was 56.8 kJ/mol.

Ding等[3]研究了NH3在MnO2/CeO2催化剂作用下在超临界水中的降解情况；Savage[4]简述了在超临界水中以CARULIFE 150、TiO2、MnO2、CuO为催化剂，对苯酚进行了超临界水氧化机理研究情况，但迄今为止涉及催化超临界水氧化的反应动力学的研究还不多。萘系有机污染物是印染

The different factors involved in the process of the folding and activation of the microbial lipase are reviewed in this article,including lipase-specific foldase,lipase activation factor,prosequence,calcium ion and disulphide bond.

对微生物脂肪酶活性构像的形成和激活机制进行深入研究，有助于我们更好地了解脂肪酶的结构和功能，为脂肪酶基因的大量表达和体外定向进化奠定基础。本文主要综述了作为脂肪酶结构成分的多种因子在脂肪酶活性构像形成、激活及稳定中的作用。具体催化反应体

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。