Fig. 1

Oxygen transfer rate of microaerobic A. vinelandii ATCC9046 cultivations. Cultivations were conducted in modified Burk’s medium with 3 g/L yeast extract (from Roth, Batch 1). The depicted OTR is the mean of 18 replicates from 12 different experiments, conducted over the course of 13 months. The corresponding standard deviation is depicted as a shadow. For clarity, only every fifth measuring point is shown. The OTR curves of each replicate are depicted in Additional file 1: Fig. S1A. Cultivation conditions: 250 mL shake flasks, initial pH = 7.2, filling volume V_L = 50 mL, temperature T = 29 °C, shaking frequency n = 165 rpm, shaking diameter d₀ = 50 mm