选择性的

The amination activity and selectivity of the catalysts can be improved by properly optimizing the compositions of the catalysts and corresponding preparation method.

苯酚是本实验条件下的主要副产物，通过催化剂的调变，可增大苯胺的选择性，降低副产物苯酚的选择性。

The enantioselective reduction of aromatic ketones was investigated by using celeriac chips as biocatalysts under mild and environmentally benign conditions, which afforded corresponding optically active-1-aryl alcohols. The enantioselectivity of products was in accordance with the Prelog's rule.

研究了用芹菜茎薄片在温和与环境友好的条件下催化芳香酮的对映选择性还原反应，制备得到具有光学活性的-1-芳基醇，产物的对映选择性符合Prelog规则。

And among substrates including 2'-chloroacetophenone, 3'-chloroacetophenone, 4'-chloroacetophenone and 3-chloropropiophenone, the highest productivity of the reduced product with S. cerevisiae B5 was observed for 2'-chloroacetophenone.

许多研究者都在致力于研究和开发产物转化率高、手性选择性好的手性化合物合成路线，其中生物转化法由于其温和的反应条件及高度的手性选择性而受到人们的青睐。

To observe the choriocapillaris closure during hematoporphyrin mono methyl ether photodynamic therapy in New Zealand rabbits in order to investigate whether HMME-PDT can be used to treat aging macular degeneration.

观察血卟啉单甲醚光动力疗法对家兔脉络膜毛细血管的封闭作用及对视网膜非选择性损伤的特点，探讨HMME是否能够选择性引起脉络膜毛细血管的闭合，达到治疗老年性黄斑变性的目的。

The olefmation of benzyl zinc bromides with aromatic aldehydes, which has some theoretical means and good application expectation, has good stereoselectivity and regioselectivity.

烯基化反应具有较好的立体选择性和区域选择性，具有一定的理论意义和较好的应用前景。

Sunlight shines on the selected sorption layer coated on the outer surface of inner glass tubes through the outer glass vacuum heat collecting tubes; the coated layer sorbs the sunlight radiation energy, changes it into the heat energy and transfers it into the liquid form medium i.e.

它像拉长的保温瓶胆，内管外表面采用磁控溅射工艺，沉积多层渐变选择性涂层，在内外管空间抽成真空，消除了气体的对流与传导热损，并应用选择性吸收涂层，使真空集热管的辐射热损降到最低。

TiO〓/K-M supported Ag/SiO〓 composite ceramic membrane tubes have been prepared and used as a membrane reactor for selective separation of C〓H〓 during the catalytic reaction process of CO〓 partially oxidating C〓H〓. By removing C〓H〓 produced in the catalytic reaction, thermodynamic balance of the reaction is upset and some side reactions from C〓H〓 are avoided, thus the conversion rate of C〓H〓 and the selectivity to C〓H〓 are effectively increased.

本研究设计、制备了硅藻土—莫来石陶瓷管负载的Ag/SiO〓复合膜，并将其应用于二氧化碳部分氧化乙烷催化反应过程中产物乙烯的选择性分离，有效地提高了催化反应的反应物乙烷转化率和产物乙烯选择性。

This paper reviews its application in the selective oxidation of functional groups and the controlled oxidation of the same functional group.

本文从不同官能团的选择性氧化和同一官能团的控制氧化两个方面综述它对一些有机物的选择性氧化反应。

Similarly, HMPA has theability to markedly affect the stereoselectivity of the tandem reaction.β-Aminoketones can be generated with high stereoselectivity (the ratio of trans-anti andtrans-syn is up to 94/6) when 4 equiv. of HMPA was used as the additive in THF.

其次，我们以二乙基锌来引发串联反应，发现HMPA对反应的选择性同样产生显著的影响，并通过在反应体系中加入4当量的HMPA，高立体选择性地得到了β-氨基酮类化合物(trans-anti／trans-syn一般为94／6)。

It was found that with the Ni-Zr-Ce/Al2O3 catalyst prepared in present work the production of aniline from benzene, hydrogen peroxide and aqueous ammonia could be realized under mild conditions, that is, at about 50 °C and under atmospheric pressure, and the selectivity of aniline is much higher than that of phenol.

发现在常压、50 ℃的温和条件下，该催化剂对苯、氨水与 H_2O_2直接氧化胺化生成苯胺有较好活性，并且其对苯胺的选择性远远大于对苯酚的选择性。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷