异构体

OBJECTIVE To establish a method for determination of levo-enantiomer in Tolterodine Tartrate by HPLC.

目的建立高效液相色谱法测定酒石酸托特罗定中左旋异构体的方法。

The results showed that the dithione R is the most stable tautomer of all the tautomers in the form of isolated or hydrated isomers.

计算结果表明， 2，6-二巯基嘌呤无论是孤立分子还是一水合物，其二硫酮式R是最稳定异构体。

The absorption cross section,σ_p, for λ=337.1 nm and fluorescence quantum yield,φ, of each tautomer are quite different.

各种异构体对λ=337.1 nm激发光的吸收截面σ_P和其荧光最子产额φ各不相同。

The effect leading to mutation occurs during DNA replication when a rare tautomer in the template strand matches with a noncomplementary base.

当模板链中的稀有同分异构体与非互补的碱基配对时，则在DNA复制过程中就会产生导致突变的影响。

By comparing the ready experimental results with the calculated results obtained at 7 basis sets and 3 theoretical levels, respectively, for the tautomeric form Cytl of cytosine, the relatively accurate B3 LYP/6-311+G(superscript **) theoretical method to study the tautomerism of cytosine was chosen.

分别采用7种基组、3种理论方法对胞嘧啶异构体Cytl的结构进行优化，通过与Cytl的实验结果进行比较，选取了适合研究胞嘧啶分子的B3LYP/6-311+11G方法。

Objective To make an Achilles tenotomy rat model to observe the change in soleus weight and expression of myosin heavy chain isoform mRNA, and to find some clues for elucidating the mechanisms of soleus disuse.

目的建立大鼠跟腱切断模型，观测并比较跟腱切断与尾部悬吊大鼠比目鱼肌重量与肌球蛋白重链异构体 mRNA表达的变化，为探讨骨骼肌废用性萎缩的机理提供实验线索。

As a rule, researchers discover that left-hand compounds are important medications, and left-hand compounds are useless, so much as unhealthful.

人们通常发现某些左手的化合物是有用的药物，而右手的异构体却没有期望的药效。

The unimolecular decomposition and dehydrogenation of ethanol initiate the branched chain reaction, and the 3 isomers of radical C2H5O determine the direction of the reaction chain branching.

乙醇氧化经裂解反应、脱氢反应最终形成支链反应，乙氧基C2H5O的三种同分异构体在链分支中决定了链分支的进行方向。

This process utilizing modern efficient wire gauze wave-like packings sepa-rates three isomers of MNT(ortho-.meta- or para-), then the O-MNT or P-MNTis nitrated to produce military TNT by a mixture of nitric and sulfuric acid.

本工艺利用近代高效的金属丝网波纹填料分离MNT的三种异构体，然后用硝硫混酸把邻一或对一MNT硝化成军品TNT，这样可避免亚硫酸钠溶液精制TNT的工序。

It was found that ARA was composed of esterification products of (2-HEA)-ester with pimaric acid, dehydroabietic acid, abietic acid and two isomers of acrylpimaric acid. ARA is a good crosslinking agent which can copolymerize with most vinyl monomers. The properties of solvent-resistance and heat resistance of the copolymer were improved considerably by the use of ARA.

实验结果表明：ARA主要由海松酸、脱氢枞酸、枞酸和丙烯海松酸的二种异构体的丙烯酸－2-羟基乙基酯的酯化产物组成，ARA是一种良好的交联剂，可与大多数乙烯基单体共聚合，其与MMA的共聚物的耐溶剂性和耐热性均得到了较大幅度的提高。

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