methods urinary proteins were abstracted by fractional precipitation method with ammonium sulfate from nephrotic proteinuria of three patients with minimal change disease (mcd) .
方法用硫酸铵沉淀法提取肾小球微小病变患者尿液中的总蛋白成分。
heme iron was prepared by enzymolysis and fractional precipitation from pig blood. at the same time amino acids and peptides were obtained, which were helpful to absorption of heme iron in body.