Fig. (6) Comparison of suspension and fixed-bed cultures for L. lactis. Volume specific lactate productivity q^*_Lac,FB versus dilution rate D. M17-Medium (Difco) with 5 g L^-1 lactose, carrier: 10 mL Multiferm and 100 mL - VitraPOR^® 4 mm, 1 L - VitraPOR^® 8 mm. The arrow indicates the maximum specific growth rate of the strain.