不对称

Fluctuating asymmetry, as an ecological monitor, will be more sensitive than traditional parameters of life history and be able to quantitate the impact of environmental stress.

而波动性不对称FA的水平可用来指示某一种群对这种环境压力的进化和适应能力。

We used the reported chiral ligand QD-4 derived from quinidine to catalyze the reaction of aldehydes and methyl vinyl ketone in the presence of various additives and found that the highest e.

用喹尼叮衍生物QD-4分别催化醛和丁烯酮以及醛和丙烯酸-萘酚酯的不对称Baylis-Hillman反应，通过改变添加剂和优化反应条件，最终分别取得了最高为49％和70％的e.e值。

Up to 97% ee was also obtained in the asymmetric hydrogenation of the more difficult and less studied 2,3-disubstitued quinoline derivatives.

以手性二胺与金属铱形成的配合物Cp*Ir(CF3TsDPEN)为催化剂，研究了在空气条件下喹啉衍生物的不对称氢化反应。

The effect of addition of absorbent resin on the preparation of-1-phenyl-1,2-ethanediol from racemate by stereoinversion was investigated, with whole cells of Candida parapsilosis as catalyst.

以近平滑假丝酵母全细胞为催化剂，考察了添加吸附树脂对不对称氧化还原外消旋苯基乙二醇制备-苯基乙二醇的影响。

In this paper research progress of synthesis of 1,1'- binaphthol and its derivatives by raceme resolution and asymmetry oxidative coupling reaction, related to 63 binaphthol compounds is detailed.

联二萘酚作为配体在催化不对称反应方面取得了极大的成功，是有机化学家研究的热点。

Chiral aminoalcohol is an important kind of chiral substance in the asymmetric synthesis, meanwhile, it is widely used in the field of medicine synthesis and the resolution of raceme.

手性氨基醇在不对称合成领域中是一类重要的手性源，同时，手性氨基醇在药物合成、外消旋体拆分等领域也具有广泛的用途。

In addition, you can easily distinguish the positive and negative, according to the anisomerous shape of radian between left and right.

使用者在理牌的时候更有手感，曲线条状左右不对称，很容易识别扑克的正反面，在清理扑克的时候更节约时间。

Typhoon moved toward the orientation where the forefinger and man grapheme spiral rainband outside.

台风形成的不对称结构影响其移向和降水分布，路径突转时极易产生短时强降水。

The asymmetrical arrangement of the discs — whose razor-thin edges emphasize the building's lightness — speaks to contemporary architectural ideas about heterogeneity and openness.

盘状结构的边缘极薄，以强调整个建筑的轻盈。它们的不对称排列呈现当代建筑对於异质性与开放性的想法。

Furthermore, a convenient procedure for synthesis of unsymmetric squarylium cyanies has been developed. We find the particular reactiveness between benzotellurazolium lodide and squaric acid: only 1: 1 condensation is involved in this reaction. The resultant can condense easily with benzothiazolium iodide to give unsymmetric squarylium dye of unique component.

研究了苯并碲唑季铵碘盐与方酸的特殊反应性，发现它们只发生1：1缩合，缩合产物可与苯并噻唑碘盐反应生成染料，从而提供了制备单一组分的不对称方酸碲菁染料的简便方法。

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。