The isospin fractionation in intermediate energy heavy ion collisions is studied by using isospin dependence quantum molecular dynamics model.
利用同位旋相关的量子分子动力学模型研究了中能重离子碰撞中同位旋分馏过程。
Pure enzyme was obtained by using the salt fractionation with ammonium sulphate, the ion-exchange chromatography and the gel filtration.
使用硫酸铵分级盐析，离交色谱，凝胶过滤可获得纯净的酶。
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