对蔬菜绿叶通过组织匀浆，差速离心分离，密度梯度离心分离、纯化、提取叶绿体。
The green leaves of vegetables through tissue homogenate, differential centrifugation separation, density gradient centrifugation purify sample of chloroplast.
大鼠心肌细胞核采用差速离心和密度梯度离心分离提纯。
Velocity and isopyknic gradient centrifugation was employed to fractionate rat myocardial nuclei.
方法利用传统鸡胚培养方法制备新城疫病毒（NDV），通过PEG-6000沉淀，差速离心和蔗糖密度梯度离心等方法提取纯化了新城疫病毒（NDV）。
Methods Newcastle disease virus(NDV) was prepared in embryonic egg. NDV was purified by deposited of PEG-6000, speed centrifugation and sucrose—density gradient—centrifugation(SDGC).
方法利用传统鸡胚培养方法制备新城疫病毒（NDV），通过PEG-6000沉淀，差速离心和蔗糖密度梯度离心等方法提取纯化了新城疫病毒（NDV）。
Methods Newcastle disease virus(NDV) was prepared in embryonic egg. NDV was purified by deposited of PEG-6000, speed centrifugation and sucrose—density gradient—centrifugation(SDGC).
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