Figure 2

Effect of sodium lactate concentration on cell growth of M. gryphiswaldense during cultivation in a 7.5 l fermentor. The experiment was carried out in Na-lactate medium as described previously [37]. The initial Na-lactate concentrations in the medium were adjusted to 20 mmol l^-1 and 2.3 mmol l^-1 respectively. The concentrations of Na-lactate could be auto-controlled at a constant level during the cultivation process using the "chemostat culture" technique based on pH-stat feeding. All experiments are repeated three times independently to prove it is reproducible.