英语语法分析

Methods: MMA was prepared with asialo-fetuin affinity and gel-filtration chromatography form murine melanoma.

方法：利用亲合层析及凝胶过滤层析从小鼠黑色素瘤中提取小鼠黑色素瘤凝集素（MMA）。

We have isolated the fetuin from sera of newborn calves by ethanol fractionation in the presence of zinc and barium ions.

本文用乙醇金属离子分级分离法，从新生小牛血清中分离提取胎球蛋白。