supercoiled英suːpər'kɔɪld美suːpər'kɔɪldBNC⁷²⁸⁶¹ 基本例句 超螺旋的¹⁰⁰原型supercoil的过去式 Supercoiled form of DNA relaxed and gradually disappeared with the increase of incubation period of copper ions with the plasmid DNA. 在铜离子浓度一定的条件下，随着二者相互作用时间的延长， DNA超螺旋结构逐渐开环，断裂直至完全消失。 cnki