查询词典 conjugation nucleus

It may be due to the following two reasons: 1 High steric hindrance caused by rigid structure of substituted fluorenone preventsthe approach of the chiral reductor;2 The prochiral center is, moreover, linked to two coplanar aromatic rings, which due to strong conjugation are highly electronically similar and thus it becomes extremely difficult to distinguish between them.

主要是以下两个原因：1取代芴酮的刚性结构产生高的空间位阻，阻止了手性催化剂的接近；2潜手性中心旁的两个芳香环不仅立体构型非常相似，而且高度的电子相似，很难被手性配体识别。

The properties concerning the symmetry and conjugation of complex multi-variable telecommunication systems, together with their number of states and transfer intensities are also investigated in the paper.

对于多元件的复杂通信系统，本文分析了其对称性、对偶性方面的性质和在状态数、转移强度数等方面的若干数量关系。

Because of the large conjugation in the structure of terphenyl and cyanogroup, these compounds should have higher birefringence.

由于此类化合物具有三个苯环和氰基组成的大的共轭体系，因此预计它们具有较高的双折射率。

Furthermore, the tied trefoil knot has less conjugation property and Jahn-Teller effect but higher total energy than the cyclo-C30 carbyne, that is, the process of "tied" could increase the energy of molecules.

因此，分子打结是一个能量升高的过程。

In these chromophores, the ring-locked triene employed as a conjugation bridge and the thiobarbituric acid moiety was as an electron acceptor in a D-π-A units.

在这些发色团中，环锁定的三烯和9，10-二氢蒽用作共轭桥，巴比妥酸和甲氧其分别作为吸电子和给电子基，组成非共轭的两个D-π-A单位。

Mechanisms which protect against the toxicity of unconjugated bilirubin include binding to plasma albumin, and rapid uptake, conjugation, and excretion by hepatic parenchymal cells.

每天80%的胆红素来自血红蛋白，非结合胆红素之毒性防护机制包括：与血浆白蛋白结合、被肝实质细胞快速摄取、结合及分泌。

Therefore, it is of great significance to establish scientific and practical standards for the regional planning on the principles of unitarity of ecology and economy, of relative integrity of the administrative area, of time limitation, of the combination of qualitative and quantitative analysis, and of regional conjugation.

因此，遵循生态与经济的统一性、行政区的相对完整性、时限性、定性与定量相结合的、区域共轭性等区划原则，建立科学可行的区划指标，对右江流域内的生态经济环境进行区域划分，对流域可持续发展有着重要的意义。

The alkoxyl group at 2-position is affected by the steric repulsion due to the two methyl groups at 1, 3-position, which causes the oxygen atom of alkoxyl group to deviate from the aromatic ring plane, hence, the conjugation effect of the oxygen atom with aromatic ring decreases

对于IV〓、IV〓，其1，3-位两个甲基对2-位烷氧基产生空间排斥作用，使2-烷氧基氧原子偏离芳环平面，烷氧基对芳环的助色作用受到削弱。

The UV-Vis spectra of the super -π-conjugation compounds havesignificant changes between DMF solution and heptane solution, that is, themain bands have a stronger bathochromic shift in DMF.

研究了该超级-π-共轭体系的电子光谱的特征，它们在DMF溶液和正庚烷溶液中的紫外可见光谱有明显的变化，与正庚烷溶液相比，在DMF溶液中的主要吸收谱带有较大的红移。

This means years of brain benumbing conjugation, declensions, idioms, exceptions, subjunctives, and irregular verbs.

这意味着要在那些令人头脑混混的连词、名词、常用语、例外情况、虚拟语气和不规则动词上花费好几年的时间。

He studied their excrement for evidence of livestock hair.

他为家畜毛的证据研究他们的粪便。

Loneliness is not grounds for deportation, deportation of the people are not all lonely people.

寂寞也不是放逐的理由，放逐的人也并不都是孤独的人。