density gradient的用法和樣例：
例句
- Five zones were separated by improved discontinuous sucrose gradient centrifugation.
用改進(jìn)的不連續蔗糖密度梯度離心法分離到五條帶。 - Methods Using different techniques of collagenase digestion and discontinued density gradient centrifugation, the adult swine and rat islets were prepared.
方法采用不同的膠原酶消化法及不連續密度梯度純化法。
