本文用二步分段盐析法，制备了胎儿淋巴细胞抑制因子(FLIF)。
Fetal lymphocyte inhibitory factors (FLIF) are prepared by means of the successive two-step salting-out procedure using ammonium sulphate.
用高速离心、分段盐析、亲和层析、超滤和阴离子交换层析法，从牛胎盘中分离纯化出一种肝细胞生长因子。
A kind of hepatocyte growth factor was purified from cow placenta through high speed centrifugation, salting out, affinity chromatography, ultrafiltration and anion exchange chromatography.
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