| 摘要 |
FIELD: veterinary medicine. SUBSTANCE: invention aims at concentrating antibodies in animal blood serum and includes coagulation and sedimentation of blood to separate blood clot, whereupon serum is clarified by centrifugation, slowly frozen for 3 to 24 hr (1-10 C/hr), thawed, and subjected to sterilizing filtration. EFFECT: twofold increased concentration of antibodies and enhanced biological activity of serum. 1 tbl, 3 ex
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