丙酮化

In the asymmetric hydrogenation of ethyl pyruvate catalyzed by 0 5% Rh/PVP TiO 2, the chiral modifier cinchonidine not only induces the enantioselectivity, but also accelerates the reaction rate greatly.

研究了辛可尼定作手性修饰剂修饰的负载型纳米铑簇合物催化剂(0 5 %Rh/PVP TiO2 )催化丙酮酸乙酯不对称氢化反应，在该反应中手性修饰剂辛可尼定不仅具有对产物生成的手性诱导作用，而且对反应具有明显加速作用；在优化反应条件后，反应的TOF和对映选择性分别可以达到 5 8 0min-1和

As well as activity was exhibited. Theaddition of cinchonidine led to a remarkable increase in the reaction rate, as confirmed bythe IR study that the modifier activates the carbonyl groups of the reactant through itsquinuclidine nitrogen. On the contrary,〓 exerted a strong inhibition effect on theenantioselective hydrogenation. Chapter 3 Finely dispersed polyvinylpyrrolidone-stabilized iridium andbimetallic clusters were prepared by the alcohol-water reduction method.

第三章 采用醇水还原的方法制备了聚乙烯基吡咯烷酮稳定的铱纳米簇及双金属纳米簇，对丙酮酸甲酯的催化氢化表明，在铱金属簇催化体系中，辛可尼定不仅诱导了一定的对映选择性，同时对反应活性有明显的促进作用，平均反应速率可提高2-6倍。

According to the building blocks concept dicyandiamide N≡C-NH-C (NH〓=NH was selected as the precursor to improve the nitrogen content in the electrodeposited carbon nitride films.

以丙酮为分散介质，在阳极电沉积过程中制备得N含量为48％的氮化碳薄膜，此膜中有一定量的C=N和C≡N键，热退火使得C≡N减弱，C-N增强。

The typical industrial technology of producing phenol was cumene process containing four steps: alkylation,oxidation,purification and recovering.

异丙苯法是苯酚、丙酮的代表性工业制备方法，主要由烃化、氧化、精制、回收四个工序组成。

The metabolism of these extreme microbes during the production of Maotai Liquor would further produce multiple enzymes of thermal stability such as amylase, protease, saccharifying enzyme, cellulose, glucase, xylanase, and each kind of dehydrase involved in redox reaction, and DNA polyase etc.

茅台酒酿造过程中极端酿酒微生物代谢产生多种热稳定性的酶，如淀粉酶、蛋白酶、糖化酶、纤维素酶、葡萄糖甘酶、木聚糖酶、参与氧化还原反应的各种脱氢酶、磷酸烯醇丙酮酸激酶及DNA聚合酶等。

The nano-Si3N4 dispersibility in acetone was characterized by the volume of suspending layer and TEM.

通过测定氮化硅在丙酮中的悬浮层体积和悬浮液的透射电镜分析来表征其分散性。

Objective To investigate the mutation characteristics in exon 7 of the PAH gene in phenylketonuria patients in Xinjiang.

目的研究分析新疆地区苯丙酮尿症患者中苯丙氨酸羟化酶基因外显子7的突变特征。

RESULTS: Image analysis of two-dimensional map revealed 72 differentially expressed proteins between MHCC97-H and MHCC97-L cells, and 9 protein peaks (including M2 pyruvate kinase,α-subunit of ATP synthase, heat shock protein 60, Toll-like receptor 9, flavoprotein oxygenase, pro-calreticulin, manganese superoxide dismutase, nm23-H1, and G-protein-coupled receptor kinase 5) were further identified by tryptic digestion, peptide mass fingerprinting and mass spectrometry.

结果： 2D图谱显示共有72个差异蛋白条带，共鉴定出了9个差异蛋白，分别为M2型丙酮酸激酶、ATP合成酶α亚单位、热休克蛋白60、Toll样受体9、含黄素单加氧酶、钙网硬蛋白前体、锰超氧化物岐化酶、nm23-H1、G-蛋白偶连受体激酶5；其中4个蛋白在高转移细胞株MHCC97-H中表达升高， 5个蛋白在低转移细胞株MHCC97-L表达升高。

Secondly,a mixture of acetone and methyl formate was added into the methanol solution of sodium methoxide to prepare sodium formyl acetone by Claisen reaction.

以金属钠为原料，甲醇为溶剂，先制成甲醇钠的饱和甲醇溶液，再滴加丙酮和甲酸甲酯进行Claisen酯缩合制得丁酮烯醇钠，最后在强酸作用下与甲醇进行缩醛化反应合成了4，4-二甲氧基-2-丁酮，过程总收率达到73.1%，纯度98.7%。

Glyceraldehyde 3-phosphoate is converted to 1,3-bisphosphoglycerate(by glyceralbehyde 3-phosphatedehydrogenase) which reacs with ADP to give 3-phosphoglycerate and ATP (catelyzed by phosphoglycerate kinase).

果糖1，6二磷酸裂解为甘油醛3－磷酸和二羟丙酮磷酸；则两个丙糖被丙糖磷酸化异构酶相互转化。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。