Fig. (5) Cultivation of L. lactis in the 1 L-fixed-bed bioreactor. Time course of cell density, pH, lactose and lactate concentration in harvest flow as well as average volume specific lactate production rate q*Lac,FB in interval with fixed dilution rate. M17-Medium (Difco) with 5 g L-1 lactose, carrier: VitraPOR® 8 mm.