那是台湾学者的翻译.
百度文库里有上海交大的现成解释如下
helix-to-coil transition
螺旋-移平卷转
Phenomenon observed in melting or denaturation of double-stranded helical DNA; as the temperature increases there is bubble formation produced by the initial separation of relatively high adenine and thymine pairs; the single strands within the bubbles,and later in the completely separated single strands,form coils.
在加热或者变性的双链螺旋 DNA 中观察到的一种现象:当温度升高 时,首先双螺旋在富含 A=T 碱基对的地方分开形成一个球状,然后球 状中两条单链完全分开,最后成为蜷曲状 coil.
