您要查找的是不是：
- purine heterocycle 嘌呤杂环
- Adenine has a purine ring structure. 腺嘌呤具有嘌呤环的结构。
- Purine rich foods are on the top of the table. 嘌呤丰富的食物是表格上方的。
- It represents an example of a heterocycle being formed as transient species. 它仍然是在反应中生成过渡状态的杂环的实例。
- They are of no immediate value of the utility of tis heterocycle in synthesis. 对这个杂环化合物在合成上的应用都没有直接意义。
- The reduced heterocycle 46 conveniently separates out during the reaction. 在反应过程中被还原的杂环（46）可以方便地分离出来。
- They are of no immediate value of the utility of this heterocycle in synthesis. 对这个杂环化合物在合成上的应用都没有直接意义。
- Aim Synthesis of nitrogen heterocycle ferrocenesulfonyl amide was studied. 目的 研究氮杂环二茂铁磺酰胺类化合物的合成。
- The substitution of a purine for a pyrimidine, or vice versa is a transversion. 嘌呤为嘧啶取代或嘧啶为嘌呤所取代，叫做颠换。
- A purine base,C5H5ON5,that is an essential constituent of both RNA and DNA. 鸟嘌呤一种嘌呤碱，分子式为C5H5ON5，为核糖核酸和脱氧核糖核酸的主要组成部分。
- A purine base, C5H5ON5, that is an essential constituent of both RNA and DNA. 鸟嘌呤一种嘌呤碱，分子式为C5H5ON5，为核糖核酸和脱氧核糖核酸的主要组成部分
- The conjuntion of the purin and phridine is like stairs of the soft steps. 嘌呤与嘧啶的连接好像软梯的阶梯。
- Uric acid (UA) is an end product from purine derivatives in human metabolism. 尿酸是嘌呤的最终代谢产物。
- Biogenic amine is a kind of low molecular compounds belonging to nitric fatty group or heterocycle group. 生物胺是一类含氮的脂肪族或杂环类低分子化合物。
- Biogenic amine is a kind of low molecular weight compounds containing nitric fatty group or heterocycle group . 生物胺是一类含氮的脂肪族或杂环类低分子化合物,对动植物和微生物活性细胞有重要的生理作用。
- Base pairing The bonding relationship between purine and pyrimidine bases in the nucleotides of DNA and RNA. 碱基配对：在DNA和RNA的核苷酸中，嘌呤和嘧啶之间相匹配的关系。
- Purine base found in DNA and RNA,pairs with thymine in DNA and with uracil in RNA. DNA和RNA中的嘌呤碱，与DNA中胸腺嘧啶和尿嘧啶成对。
- Abstract In this paper a review on solid phase synthesis of small molecule libraries with heterocycle structrure is presented. 摘要本文综述了近年来关于含杂环小分子库固相合成的研究进展。
- Determination of rumen microbial-nitrogen of sheep using urinary excretion of purine derivatives was studied. 研究了用绵羊尿中嘌呤衍生物估测瘤胃微生物氮。
- Recently the development of a new-type organophosphorous pesticide with ternary asymmetric structure and heterocycle structure has been very active. 带有三元不对称结构和杂环结构的新型有机磷杀虫剂的开发，近年来一直比较活跃。
