According to the observed morphology on the fracture surface, the fracture surface had pseudo-cleavage feature and plastic tearing feature in the last stage of crack growth in high magnification.
高倍下观察断口发现有准解理特征，在裂纹扩展最后阶段有塑性撕裂特征。
In the presence of oxygen and metal ions, notably copper and iron, bleomycins form a pseudo-enzyme that induces DNA cleavage.
在氧和其他金属离子特别是铜和铁离子存在时，博来霉素形成拟酶诱导DNA断裂。
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