DNA strand scission and topology changes are catalyzed by DNA topoisomerases.
DNA拓扑异构酶与断开dna链和改变其拓扑结构有关。
PP will degrade due to heat during processing, resulting in chain scission of macromolecule, reduction in molecular weight and rise in MI.
聚丙烯在加工时受热将发生大分子断链降解，致使分子量减小，熔体指数上升。
The dependence of chain scission and racemization on temperature results from molecular motion, "cage effect" and steric hindrance during recombination.
分子量降低和消旋作用对温度的依赖性，是由于分子运动和笼罩效应以及重合的空间位阻效应所致。
The invention relates to a method for preparing low-molecular vegetable gum through chain scission of macromolecular vegetable gum by a physical or chemical method.
本发明涉及通过利用物理或化学的方法，使高分子的植物胶断链而成为低分子植物胶的制备方法。
The radiation effect on poly (methyl methacrylate) with different tacticities was studied. It was proposed that chain scission process was in a kinetic equilibrium between scission and recombination.
本文研究了三种不同空间立构聚甲基丙烯酸甲酯的辐射效应，提出裂解过程是一种裂解与重合的动态平衡过程。
The radiation effect on poly (methyl methacrylate) with different tacticities was studied. It was proposed that chain scission process was in a kinetic equilibrium between scission and recombination.
本文研究了三种不同空间立构聚甲基丙烯酸甲酯的辐射效应，提出裂解过程是一种裂解与重合的动态平衡过程。
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