异构体

The in vitro anticancer activities of the ruthenium complexes were screened by MTT assay.

采用MTT法评价了3种异构体对多种肿瘤细胞株的体外抗肿瘤活性以及对正常细胞的毒性。

The compounds are represented by the structural Formula 1, Chemical formula should be inderted here as it appears on the abstract in paper form. a prodrug thereof, or any pharmaceutically acceptable salt, solvate, isomer or racemic mixture of the compound or said prodrug wherein R1 is heteroaryl, N-arylaminocarbonyl, N-heteroarylaminocarbonyl, benzimidazolyl or benzothiazolyl; R15 is present or not and if present is H, aryl, alkyl, arylalky or heteroarylalkyl; A is aryl, heteroaryl, cycloalkyl, cycloalkylidene, heterocycloalkylidene or heterocycloalkyl wherein said aryl, heteroaryl, cycloalkyl, cycloalkylidene, heterocycloalkylidene and heterocycloalkyl moieties may be substituted or unsubstituted; and B, L, X and R18 are defined herein.

所述化合物用结构式1表示，包括其前药或所述化合物或所述前药的任何药学上可接受的盐、溶剂合物、异构体或外消旋混合物，其中R 1 为杂芳基、N-芳基氨基羰基、N-杂芳基氨基羰基、苯并咪唑基或苯并噻唑基；R 15 存在或不存在，如果存在，则为H、芳基、烷基、芳基烷基或杂芳基烷基；A为芳基、杂芳基、环烷基、环烷叉基、杂环烷叉基或杂环烷基，其中所述芳基、杂芳基、环烷基、环烷叉基、杂环烷叉基和杂环烷基部分可被取代或未被取代；B、L、X和R 18 如说明书所定义。

The properties of all phase composition s, types of main crystalline phase, sizes of grains and their distribution, properties of daily steatite ceramics were described in this paper.

叙述了日用滑石瓷结构中的各种物相比例，主晶相类型、粒径大小及其分布状态、性质，介绍了其具有晶体小、结构细微、光学性质相似，具有同质异构体的独特显微结构，探讨了显微结构与生产工艺、各项性能的相互依赖关系。

Serum levels of ADMA and its stereoisomer, symmetrical dimethylarginine, were determined using high-performance liquid chromatography.

使用高效液相色谱法测定ADMA及其立体异构体对称二甲基精氨酸的血清浓度。

Uses: Lutein, and its naturally occurring stereoisomer zeaxanthin, is used as part of a general carotenoid defense against oxidative stress, whether solar or metabolic.

用途： 叶黄素和其立体异构体玉米黄质，作为常规类胡萝卜素的一部分，用于防止来自日光的或者来自新陈代谢的氧化压力。

The optical activity of a stereoisomer is expressed quantitatively by its optical rotation, The specific rotation 〖α〗D25C of an optically active compound is defined thus

立体异构体的光学活性是以旋光度定量表示的，光学活性物质的比旋光度〖α〗D25C是这样定义的

The other stereoisomer rotates plane-polarized light to the same extent but to the right and is called the dextrorotatory isomer, designated.

另一立体异构体使平面偏振光向右旋转称为右旋，标记为。

The other stereoisomer rotates plane- polarize d light to the same extent but to the right and is called the dextrorotatory isomer, designated.

另一立体异构体使平面偏振光向右旋转称为右旋，标记为。

B (1R,3S)-1-ethyl-3-bromocyclopentane,andan optically active stereoisomer of 1,3-diethylcyclohexane.

答：指出1-甲基萘的所有手性中心，它存在多少个立体异构体

The mechanism of the reaction was studiedin detail,in which excited state avaliable to carryout the excited state intramolecular proton transferreaction was recognized.The INDO/S-CI semiempiricalMO method was used to calculate transition energiesand oscillator strength,and assign spectra theore-tically,the calculated spectra values were basicallyconsistent with the experimental values.Themolecular orbital properties for the adjacent HOMO-LUMO of various kinds of conformersand anion species,thetransition properties and symmetry for thetransition from ground state to lower excited stateswere analysed,especially,no much study on theanion species all of the world.

位能曲线的求法满足反应坐标是反应过程中能量最小途径的定义，较详细地研究了各类反应的质子转移历程，认定在哪个激发态有利于发生激发态分子内质子转移反应，用INDO/S-CI半经验MO方法进行跃迁能和振子强度计算及光谱的理论指认，计算的光谱值和实验值基本吻合，并分析了各种异构体和阴离子的HOMO-LUMO附近的轨道性质，各跃迁态的跃迁性质和对称性，尤其是对阴离子的研究国内外尚不多见。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐