另两个为胸腺嘧啶和胞嘧啶, 即称为嘧啶的单环结构.The other two, thymine and cytosine, are single ring structures called pyrimidines.嘌呤为嘧啶取代或嘧啶为嘌呤所取代,叫做颠换.The substitution of a purine for a pyrimidine, or vice versa is a transversion.本文研究氟脲嘧啶(5—...
"Let's get a coffee somewhere."—"I know just the place."“我们找个地方喝杯咖啡吧。”——“我知道个好地方。”Somewhere deep beneath the surface lay a caring character.在内心深处的某个角落里埋藏着一颗爱心。From somewhere distant he heard the clatter of a typewri...
Cypher ( Cordis ) and Taxus ( Boston Scientific ) stents are the major product in the market.目前上市的主要产品有Cypher ( 雷帕霉素洗脱支架,Cordis公司 ) 和Taxus ( 紫杉醇洗脱支架,BostonScientific公司 ) 支架.In Cypher group, the above - mentioned index wa...