Figure 1

1.1 (left): viable cell density and viability during shake flask batch-cultivation. open squares: bioreactor tube, open circles: 125 mL-shakeflask, open diamonds: 250 mL-shakeflask. 1.2 (middle): viable cell density and viability during bioreactor batch-cultivation. open squares: 2 L-glass vessel, open circles: 20 L-stainless steel reactor. 1.3 (right): specific growth rate μ of bioreactor cultivation vs. corresponding specific productivity qP. open diamonds: 20 L- stainless steel reactor, open squares: 2 L-glass vessel