嘌

The reaction mechanism of thione-thiol tautomerism for 2,6-dithiopurine obtained from proton transfer has been investigated by DFT B3LYP method with 6-311＋G basis set. The reaction enthalpies, activation energies, activation free energies and the rate constants of tautomerism were obtained.

采用密度泛函B3LYP方法，在6-311＋G基组水平上对2，6-二巯基嘌呤质子转移引起的硫醇式与硫酮式互变异构反应进行了计算研究，获得了互变异构过程的反应焓、活化能、活化吉布斯自由能和质子转移反应的速率常数等性质。

Demonstrative green tea can reduce gland purine to be damaged to the qualitative pathology between bandicoot kidney, green tea has fight the action that qualitative fiber changes between kidney, and can restrain hyperplasia of fibrous of I,Ⅲ collagen, this may be green tea qualitative fiber is changed between kidney of prevention and cure, one of mechanisms that defer chronic kidney failure to develop a process.

说明绿茶能够减轻腺嘌呤对大鼠肾间质的病理损害，绿茶有抗肾间质纤维化的功能，并且能抑制I、Ⅲ型胶原纤维的增生，这可能是绿茶防治肾间质纤维化、延缓慢性肾衰竭发展进程的机制之一。

Keeping drinking tea helps maintain the regular balance of acid base of blood, for tea leaf, which is a kind of wonderful alkalescence drink, contains some alkaloid substances such as theine, theosine, theobromine and xanthine.

饮茶能维持血液的正常酸碱平衡。茶叶含咖啡碱、茶碱、可可碱、黄嘌呤等生物碱物质，是一种优良的碱性饮料。

Tea contains caffeine, theophylline, theobromine, xanthine alkaloids and other substances, is a good basic drinks.

茶叶中含有咖啡因，茶碱，可可碱，黄嘌呤等生物碱物质，是一个良好的基础饮料。

This class of substances includes caffeine and the related chemical theobromine.

巧克力由可可豆加工而成，含有多种甲基黄嘌呤的衍生物，咖啡因和可可碱就属于这类物质。

The stability energy of the whole complex, and the interaction energy between two purine bases and the [Pt-(NH3)thiazole]2＋ group were adopted to study the interplay among subsystems and their contribution to relative stability of all the studied cross-link model.

本文采用化合物整体稳定化能，两个嘌呤碱基与[Pt-(NH3)thiazole]2+部分的相互作用能来研究不同部分间的相互作用及其对加合物的相对稳定性的影响。

The waves are very useful for the determination Of these compounds, for homocystine, 6-mercaptopurine and thiouracil, the detection limits are 2×10-8, 8×10-8 and 5×10-8 mol/L,respecrespectively.

处产生的阳极化波较为灵敏，其检测限为2×10－8mol／L高胱氨酸，线性范围为8×10－8～1×10－5mol／L.6－巯基嘌呤和硫尿嘧啶在乙二胺介质中与铜产生的络合物波较好，前者在－0.83V处和后者在－0.44V处的阴极波较适合于分析。它们的检测限分别为8×10－8mol／L和5×10－8mol／L，线性范围为1×10－7～1×10－5和1×10－7～2×10－5mol／L。

Sensitive polarographic waves which relate to thiouracil, 6-mercaptopurine and homocystine(in sodium citric acid buffer solution) appeared in the presence of Cu.

高胱氨酸、6－巯基嘌呤和硫尿嘧啶均能与铜离子作用而在汞电极上产生两个吸附波。在柠檬酸钠溶液中，高胱氨酸与铜的络合物在－0.06v

It is important in the growth and reproduction of cells, participating in the synthesis of purines and thymine.

在细胞生长和再生中也很重要，参与了嘌呤和嘧啶的合成。

"One of the purines or pyrimidines (cystosine, thymine, and uracil ) that occurs attached to the sugar component of DNa or RNa."

嘌呤或嘧啶(胸嘧啶、胸腺嘧啶和尿嘧啶)的一种，附着在脱氧核糖核酸或核糖核酸的糖分子上。

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