Fig. 2From: Coproduction of menaquinone-7 and nattokinase by Bacillus subtilis using soybean curd residue as a renewable substrate combined with a dissolved oxygen control strategyCorrelation between NK activity and MK-7 production in different microorganisms. The medium was composed of 10% (w/v) soybean flour and 5% (w/v) glycerol, the pH was maintained at the original value, and fermentation was carried out at 37 °C and 200 rpm in shake flasksBack to article page