Use was made of fresh blood of swine, diluted with an equal amount of distilled water to produce a protein hydrolysate. Enzyme hydrolysis was effected through extracellular alkaline protease produced by stain DI of Bacillus subtilis. The cell lines BHK-21, PK-15 and spzv were cultured in a nutrient medium containing 0.180-0.200 mg/cm3 alpha-amine nitrogen and relevant growth factors of nonprotein character. It was found that the cells cultured in this medium showed no differences with regard both to morphology and karyology as against the control cells which were treated with the classic medium of Eagle. It was also found that the medium could successfully be used instead of the imported nutrient media.
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