用线性化质粒 DNA 电穿孔前环锥虫体，筛选其对磷霉素的抗性。
Procyclic trypanosomes were electroporated with linearised plasmid DNA and selected for resistance to phleomycin.
从穿孔机调整、工具形状等方面分析了二辊锥型穿孔机产生轧卡的原因，并提出了相应的预防措施。
This paper analyzes the reasons leading to rolled stock jamming in duo cone type piercing mill on piercing mill adjustment and tool shape etc. and puts forward corresponding preventive measures.
斜轧穿孔机轧辊形状设计十分重要，其中辗轧锥角的正确设计是获得高精度壁厚的关键。
Proper design of roller cone angle of smooth rolling is the key to obtaining a high accurate wall thickness.
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