Cycles of heat to break apart the DNA strands, cooling to allow the primers to bind, and heating again to allow the enzyme to copy the intervening sequence, lead to a doubling of DNA at each cycle. 循环升温分离DNA双链,降温使引物结合,再升温使酶能复制DNA。这样每一循环产生双倍DNA。
Rapid prototyping technology can shorten the cycle of product trial and single, small batch manufacturing. Reverse engineering, on the basis of the existing technology, can copy products and optimize the design, shortening product design cycle. 快速成型技术可以缩短产品试制及单件小批量制造周期;而逆向工程可以在吸收已有技术的基础上,对产品进行仿制和优化设计,从而缩短产品设计周期。
This will make industry into a more timid handing innovative error and "copy" vicious cycle. 这就会使行业陷入更大的怯于进行创新的误区和抄袭的恶性循环。
Power system operation and management requires lots of real-time data statistics, analysis and assessment, previous artificially copy table statistics slow, statements cycle is long. 电力系统的运营和管理需要许多的实时统计、分析和考核数据,以往人工抄表统计数据慢、报表周期长。
Moreover, the episomal vectors exist in host cells at a low copy number and are duplicated to the progeny cells by depending on the cell cycle. 同时这类载体在宿主细胞中以低拷贝数存在,并以依赖细胞周期的形式复制到子代细胞中。