Fig. 6From: Coproduction of menaquinone-7 and nattokinase by Bacillus subtilis using soybean curd residue as a renewable substrate combined with a dissolved oxygen control strategyChanges in a the MK-7 concentration, b NK activity, and c CFU levels at different aeration rates during the course of 3.7-L bioreactor fermentation. The medium was composed of soybean curd residue (12.2%, w/v), soya peptone (5.7%, w/v), lactose (2.6%, w/v), and K2HPO4 (0.6%, w/v)Back to article page