查询词典 asymmetric

Configurational isomerism is then due to the presence in the molecule of one or more dissymmetric centres ,in the simplest case asymmetric carbon atoms ,each of which can have and absolute configuration; and ,or ,to the presence of double blonds which can give cis- and trans-geometrical isomers .

构型异构是由于分子中存在一个或一个以上的不对称中心，在最简单的情况下是不对称碳原子，每个不对称碳原子的绝对构型是和；或者，如果存在双键的话，那么将给出顺式和反式几何异构体。

A three-dimensional Langevin equation with covariant form is applied to describe the asymmetric nuclear fission .

采用一个具有协变形式的朗之万方程组来描述不对称热核裂变。

Agricultural insurance was in a critical state of asymmetric information, in particular of adverse selection problems.

农业保险发展缓慢的主要原因是由于保险公司内部原因，以及弱质农业本身在面临市场和自然双重风险威胁时，为农业保驾护航的农业保险却陷入了信息不对称引起的逆向选择问题。

The influences of Asymmetric information within enterprises and internal "egalitarianism","cronyism", enterprise-cultural in enterprises are also very prominent.

企业内部信息不对称和企业内部"平均主义"、"任人唯亲"、"官官相护"等企业亚文化的影响也十分突出。

Under the optimized conditions, in-situ-generated N,N -dioxide from the corresponding amide (10 mol%) and m-CPBA (20 mol%) retained the same asymmetric catalytic activity and enantioselectivity, and most of the aromatic,α,β-unsaturated, heterocyclic, aliphatic and steric hindrance ketones could be converted into the corresponding cyanohydrin trimethylsilyl ethers in up to 99% yield and 93% ee.

底物扩展证明，该有机小分子催化体系对芳香酮、杂芳香酮、脂肪酮、位阻酮以及α，β-不饱和酮都具有优良的手性诱导能力，收率高达99％，对映选择性达93％ee。

In this dissertation, eight novel bisoxazoline ligands L1-L8 containing 2,2-dimethyl cyclopropane units have been synthesized and evaluated in the asymmetric cyclopropanation and Diels-Alder reaction, moreover the influence of many factors on the enantioselectivity of the new ligands was studied in detail.

在本论文中，我们设计并合成了8个新型双噁唑啉手性配体L1～L8，并研究它们在环丙烷化反应与Diels-Alder反应中的对映选择性，以及影响配体不对称诱导性能的各种因素。

Contribution of asymmetric cytosine deamination was found to be weak to TAP in most phyla, and strong to RAP in all the Proteobacteria but weak in most of the Firmicutes. This possibly reflects the differences in their chromosomal replication machineries.

不对称的cytosine deamination作用对大多数的门中的TAP贡献很小，对Proteobacteria的RAP贡献显著，而对大多数Firmicutes的RAP贡献很小，这可能反映了这两门物种间染色体复制机制的不同。

Although many synthetic routes to spiro[4,5]decane have been reported, few reports have been focused on the asymmetric synthesis of the title compounds.

虽然有关旋环状[4，5]癸坑的合成途径已经被报导，但其中仅有少数几篇是利用不对称合成方法来合成具有光学活性的此类化合物。

Result Asymmetric inlet velocity profile deflexion could increase the area of low shear stress and the gradient of shear stress.

结论不对称入口速度剖面可能是诱发动脉粥样硬化发生的一个危险因子。

The author concludes that the last deglaciation climate variation in the proxy records for the east Asian monsoon has an asymmetric shape; the warming events are abrupt and the cooling events are gradual.

指出东亚季风区末次冰消期气候的不对称性即从暖期向冷期的渐变以及从冷期向暖期的突变过程。

Diabetes is a social disease that affects several million people worldwide.

糖尿病是一个社会性疾病，全世界有数百万人罹患此病。

I'll call you on Friday to see if we can reschedule our luncheon meeting at your convenience.

我星期五会给您打电话在您方便的时候我们重新安排我们的午餐约会。