Fig. 5From: Enhanced malic acid production from glycerol with high-cell density Ustilago trichophora TZ1 cultivationsFermentation of Ustilago trichophora TZ1 with CaCO3. a malate concentration (squares) and glycerol concentration (circles), b fermentation broth after 264 h of fermentation in MTM containing 200 g L−1 glycerol, 3.2 g L−1 NH4Cl and 100 g L−1 initial CaCO3 at 30 °C with DO kept at 80 %Back to article page