催化作用

In the first part, rhodium acetate catalyzed 1, 3-dipolar reactions of 1-diazo-2-oxo-propylphosphonates with nitriles was studied.

在催化量的醋酸铑作用下，1-重氮-2-羰基丙基膦酸酯与芳香腈顺利进行反应，而对脂肪腈的反应则很复杂，没有得到预期产物。

Then, it was condensed with-valine methyl ester to form a chiral imine, which was reacted with allyl zinc bromide in the presence of CeCl3·7H2O to afford the corresponding chiral homoallylic amine with high optical activity.

-N-Boc-3-苯基-2-氨基丙醛与-缬氨基酸甲酯缩合生成手性亚胺，在七水合三氯化铈（CeC13·7H2O）催化以及底物的手性诱导作用下，该手性亚胺与烯丙基溴化锌经不对称加成反应合成了高光活性的单烯丙基化手性胺。

Dehydroascorbate reductase catalyzes the re-reduction of DHA to ascorbate by glutathione. Thus, dehydroascorbate reductase is critical for protection of cellular components against oxidative injury.

脱氢抗坏血酸还原酶以谷胱甘肽为底物，催化脱氢抗坏血酸还原为抗坏血酸，在循环利用抗坏血酸、保护细胞组分抵御氧化损伤中发挥重要的作用。

To study the influences of methane on selective non-catalytic reduction, the condition of flue gas composition was simulated on a drop tube furnace test rig, and the influences of a few of methane on SNCR temperature window, NOx reduction efficiency and ammonia slip from 650℃ to 1 150 ℃ were investigated, as well as reactivity of methane.

为研究甲烷对选择性非催化还原脱硝反应的影响作用，在沉降炉实验台上模拟锅炉烟道内的反应环境和烟气成分，在650~1150 ℃范围内，研究了微量甲烷对SNCR反应温度窗口、脱硝效率和氨泄漏的影响，以及甲烷在脱硝过程中的反应特性。

Scattered into ethanol, ethyl silicon is medium tetraethyl ortho-silicate in ammonia catalytic hydrolysis, formed under the condition of the negatively charged with PS silica microspheres due to charge effect between by adsorption to PS microspheres surface, core-shell structure.

将其分散到乙醇/水介质中，正硅乙酸乙酯在氨水催化条件下水解，形成带负电性的二氧化硅与PS微球之间由于电荷作用而被吸附到PS微球表面，形成核-壳结构。

The metals, such as Fe, Cu and Co, which can be reduced by KBH〓, can not change the catalytic properties obviously if only small amount of them are added to Ni-B alloys; those who can not react with KBH〓, such as Zn〓, are washed out during the preparation, so they also can not change the catalytic properties; while addition of the elements in VIB group, such as Cr, Mo and W, can increase the hydrogenation activity magnificently.

同样，我们通过添加第三组分来修饰Ni-B合金，可以被还原的金属，如Fe、Co、Cu等，少量添加并不能明显改变其反应性能；而与KBH〓不发生反应的金属，如Zn，以离子形式加入后，除了少量离子被吸附在催化剂表面外，基本不残留在催化剂里，因此对反应性能也没有太大的改变；只有VIB族元素，如Cr、Mo、W的加入才会很大改进Ni-B催化剂在蒽醌加氢中的催化性能，尤以Cr的修饰作用最好。

And the anodic peak potential shifted negatively 245mV. The test indicates that cauliflowers have a outstanding effect on Electrocatal yticOxidation and the test is very sensitive, fast and selective.

该电极与纯碳糊电极的性能进行比较，证明花椰菜对V_c有明显的电催化氧化作用，检测灵敏、快速、选择性好，同时，提高了电极的稳定性和重现性。

And our work is to synthesize the expandable graphite which has greater volume and lower sulfur content, with organic regent substituting for oil of vitriol and with some oxidants using to meet the need of the industry manufacture, to study the catalysis capability of the product.

我们的工作是改用有机介质逐步替换浓硫酸，在某些氧化剂的作用下制备出大膨胀体积，低硫含量的可膨胀石墨产品，使其符合工业生产需要，并对其催化性能进行初步研究。

Electrocatalytic oxidation is further carried out in the presence of the ·OH radical scavenger tert -butyl alcohol, which indicates that both direct and indirect oxidation are responsible for the degradation of phenol.

加入·OH清除剂叔丁醇的研究表明，本体系中苯酚的电催化氧化是由直接氧化和间接氧化的协同作用共同去除。

The reaction catalyzed by DAK converts DHA into dihydroxyacetone phosphate which is no toxic and can be ustilized by yeast cells. DAK presents in most organisms. DAK genes in the Saccharmyces cerevisiae and P. pastoris were cloned and characterized by a combined genetic and biochemical approach and the proteins encoded by these DAK genes are homodimer.

二羟基丙酮对酵母细胞来说是种有毒的化合物，在酵母菌中二羟基丙酮激酶参与二羟基丙酮的脱毒作用，DAK催化的反应使二羟基丙酮磷酸化，形成无毒性的磷酸二羟丙酮，可为酵母细胞所利用。

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。