丙酮基

Methods: According to the refe-rence of new traditional Chinese medicine study, maximal dosage of drug was given to rabbits to do the acute toxicological and irritative test on skin. The guinea pig was used to do the skin hypersensitive test with excipient as negative control and 1% 2,4-dinitrochlorobenzene as the positive control.

参照中药新药研究指导原则，采用最大给药剂量法对大白兔进行皮肤用药急性毒性和刺激性试验；以赋形剂为阴性对照，1%的2，4-二硝基氯苯丙酮溶液为阳性对照，对豚鼠进行皮肤过敏性试验。

To understand the molecular basis of the high selectivity of the inhibitor and the mechanism of feedback inhibition, we determined the crystal structure of LiCMSC (C-terminal regulatory domain of LiCMS) in complex with isoleucine, and performed a biochemical study of the inhibition of LiCMS using mutagenesis and kinetic methods.

丁建平和赵国屏课题组合作，运用结构生物学和生物化学的方法分别研究了 CMS 的催化结构域与其底物丙酮酸、乙酰辅酶 A 、金属辅基的四元复合物的晶体结构，和 CMS 的调节结构域与反馈抑制剂异亮氨酸的复合物的晶体结构，以及全酶与这些配体相互结合的动力学性质。

Objective: To establish a method for mesityl oxide in the air of workplace by GC -MS.

目的 建立工作场所空气中异亚丙基丙酮气质联用测定方法。

The method meets the requirements of Regulation of Studies on the Determination of Toxicants in the Air of Workplace. It is suitable to determine the mesityl oxide in the air of workplace.

本方法各项指标达到《工作场所空气中有毒物质检测方法研制规范》要求，适用于工作场所空气中异亚丙基丙酮的测定。

The method is meet the requirements of Regulation of Studies on the Determination of Toxicants in the Air of Workplace.It is suitable to determine the mesityl oxide in the air of workplace.

本方法各项指标达到《工作场所空气中有毒物质检测方法研制规范》要求，适用于工作场所空气中异亚丙基丙酮的测定。

The four fluorescence peaks are generated separately by the combined actions of the methyl parathion and the acetone. In methyl parathion molecule, there are the transition of n electrons in nitryl, the transition of π electronic structure formed by the oxygen atom and the benzene ring and the transition of n electrons in P=O group. In acetone molecule, there is the transition of n electrons in C=O group.

分析得到，四处荧光峰分别是溶剂丙酮分子中C=O上的n电子跃迁、硝基上的n电子跃迁、甲基对硫磷分子中氧原子与苯环形成的大共轭π电子结构跃迁以及P=S上的n电子跃迁共同作用产生。

Given the known reaction mechanism and general chemical considerations, we propose that nicotine, when used as the carbon source by P. putida J5, is catabolized to pyruvic acid via pyrrolidine pathway and then participates in the synthesis of vitamin pantothenate and CoA, which supply the energy for the normal functioning.

通过对突变位点基因的功能分析推测，假单胞杆菌可以将尼古丁代谢为2，5-二羟基吡啶，而2，5-二羟基吡啶可以进一步转化为丁烯二酸和丙酮酸，进而参与了泛酸和 CoA 的合成，为生理代谢提供基质。

But more oxygen radicals were inactivated per unit of time .this meant that in the presence of zinc pyruvate.

但每单位时间内有更多氧自由基失去了活性。这意味着在锌丙酮酸盐的出现。

It was also found that the activity of glycine decarboxylase increased with incre- ase in nitrate concentrations in the sandculture medium.

但他们认为在体内，这种还原剂可能全部用于过氧物酶体中经基丙酮酸到甘油酸的反应。

Liquid-phase epoxidation of allyl chloride with hydrogen peroxide was carried out over Ti-MWW, a novel titanosilicate with the MWW structure, to synthesize epichiorohydrin selectively and effectively. Ti-MWW proved to be superior to the conventional TS-1 catalyst in both catalytic activity and product selectivity. Ti-MWW prefers aprotic solvents of acetone and acetonitrile, both of which can restrain the solvolysis of epichiorohydrin, whereas TS-1 favors a protic solvent of methanol.

研究了具有MWW结构的新一代钛硅分子筛Ti-MWW催化剂对烯丙基氯液相环氧化高效合成环氧氯丙烷的催化性能结果表明，Ti-MWW的催化活性以及产物选择性均优于传统的钛硅分子筛TS-1，对于Ti-MWW，合适的溶剂为非质子性溶剂丙酮和乙腈，在该溶剂中环氧化物不易发生溶剂化开环反应；而对于TS-1，合适的溶剂是质子性溶剂甲醇，但甲醇可导致醇醚副产物的生成。

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。