催化作用

The catalyst produced by depositionprecipitation mixed with promoter is of higher activity than that by impregnation.

CeO2在载体中的掺杂对提高CO的催化氧化活性和选择性起关键作用。

IMPA2 enzyme as a mainly and catalytic inositol plays an important role in cell signaling system.

IMPA2酶是主要催化肌醇生成，并在细胞信号传导系统发挥重要作用的一种酶。

It plays an important role in maintaining the intracellular balance of A and G nucleotides.

该酶所催化的反应对维持细胞内腺嘌呤和鸟嘌呤核苷酸的平衡发挥着重要作用。

It was found that Pd-Co/active carbon catalyst was the optimal catalyst, and Pd-Co/γ-Al2O3 was also good, but silica and kieselguhr were not proper carriers for the object reaction, because of their stronger surface acidity, which could result in the formation of polymer, jammed the micro pores of catalyst, and then resulted in its deactivation. Addition of Bi, Ce and Cu promoters could not improve the activity of catalyst, but La and Ba promoter could enhance the activity of catalyst apparently, and the Co was the best promoter, especially Co was impregnate in advance. It was attributed to that the pre-impregnated Co may occupy the micro pores of active carbon, and cover some bad functional groups on the surface of catalyst, so that the active and selectivity of catalyst could be enhanced obviously.

研究结果表明，Pd-Co/活性炭催化剂是目标转移加氢反应的最适宜催化剂，Pd-Co/γ-Al203效果也较好，而硅胶和硅藻土由于表面酸性较强，容易造成生成聚合物而堵塞催化剂微孔、使催化剂迅速失活；此外，添加Bi、Ce、Cu等助剂时对活性并无改善作用，而添加La和Ba助剂时可使Pd的催化活性有所提高，效果最好的是Co助剂，尤其是先浸渍Co的Pd-Co/C催化剂，原因是Co占据了活性炭的微孔、覆盖了某些对目标反应不利的官能团，使其活性和选择性都有较大幅度的提高。

Over a solid acid catalyst, the reaction in which methanol and formaldehyde are condensed into mathylal is reversible. This reaction tends to be completion by reactive distillation and the high-purity methylal product can be obtained.

在固体酸催化剂作用下，由甲醇、甲醛缩合生成甲缩醛，该反应为可逆反应，采用催化精馏技术可使反应趋于完全，并得到高纯度甲缩醛产品。

Having experimented and studied of photocatalyses by ultraviolet rays and titanium dioxide which in millicron state,then,we applied photocatalysis technology of millimicron material to relevant luminaire.

本文通过紫外线与纳米级TiO2 材料进行光催化的试验研究，然后将该项技术应用到相应的灯具上，使常用的照明灯具在室内起到了空气净化的作用，改善了生活环境和工作环

Property of metal , catalytic application of acidity , influence of disperse configuration , leaching of niobium

在催化过程中所起的作用，并结合铌在不同反应中的具体应用实例进行了分析和验证。

Arginase, which converts arginine to ornithine and urea, is a kind of enzyme in urea cycle. It plays a significant role in N mechabolism.

精氨酸酶是尿素循环中的一种酶，催化精氨酸水解产生鸟氨酸和尿素，在机体氮代谢方面起了重要作用。

It was shown that CpeS is the lyase of Cys-84 ofβ-CPC andβ-PEC.

这些结果表明：藻蓝蛋白裂合酶起到了催化PCB与Cys-84连接的作用。

To measure and analyze gaseous acetone fastly, a indirect analyzing method based on photolysis and catalysis transformation is researched.

为了快速检测和分析丙酮，提出了一种利用光解和催化转化作用的间接检测方法。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！