抄録
The previously reported growth factor (tentatively named as Factor K) for Streptococcus faecalis 10Cl was extracted from the dried mycelium of Aspergillus oryzae (1kg) with a sulfuric acid solution and concentrated about 2400-fold with a yield of 9.2% by means of chloroform・water extraction and Amberlite IR-4B resin treatment.
