活性的

Optically active ethyl-3-hydroxybutyrate,a useful chiral synthon,was prepared by stereoselective reduction of ethyl acetoacetate of the bread yeast in organic solvent.

利用面包酵母在非水相中不对称还原乙酰乙酸乙酯，制备了光学活性的手性化合物S-3-羟基丁酸乙酯。

To analyze the changes of cytotoxicity mediated by NK cells after 24 h coculture with K562 cells and the molecular mechanism.

目的：探讨NK细胞与K562细胞混合培养前、后其杀伤活性的变化及分子机制。

Resulting from our experiments show that cytokinins,especiallyzeatin,is very important to sustain root system activity and leafphysiology.

试验表明根源细胞分裂素是维持根系及地上部生理活性的重要机制，其主要成分是玉米素。

Resulting from our experiments show that cytokinins, especiallyzeatin, is very importam to sustain root system activity and leafphysiology.

试验表明根源细胞分裂素是维持根系及地上部生理活性的重要机制，其主要成分是玉米素。

The effects of effectors such as multiple metal ions and organic solvents on ALP in viscera of rice-field eel.

方法］研究多种金属离子、有机溶剂等效应物对黄鳝内脏碱性磷酸酶活性的影响。

Glycoprotein that is mainly involved in the control of neutrophil elastase activity.

主要控制嗜中性酯酶活性的糖蛋白。

This work is significant to filter and empolder novel drugs with good hypnotic-sedative activity.

这项工作对于筛选与开发具有更强镇静催眠活性的新药有着重要意义。

Objective To isolate and screen fungal endophytes with antibacterial and antifungal activities from mangrove plants.

目的 分离和筛选具有抗细菌和抗真菌活性的红树林内生真菌。

The effects of different concentrations of Cr(superscript 6+)(0, 10, 20, 50, 100 mg/L K2Cr2O7) on the content of Pro, malondialdehyde, membrane permeability, activities of protective enzyme SOD and POD in roots and epicotyls of maize seedlings were studied.

研究了不同浓度(0， 10， 20， 50， 100mg/L K2Cr2O7)Cr(上标 6+)胁迫对玉米幼苗根和上胚轴中脯氨酸和丙二醛含量、细胞膜透性、超氧化物歧化酶及过氧化物酶等保护酶活性的影响。

IAA oxidase activity during the fruit bud differentiation of "Ping Guo Li" in leaves measured by UV-Vis method was studied.

本文介绍了用紫外分光光度计测定苹果梨花芽分化各时期叶片中IAA氧化酶活性的方法。

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。