Batch cultivation of K. pneumoniae J2B DldhA in 1.5 L bioreactor at different aeration rates. (A) 0.05 vvm, (B) 0.25 vvm, (C) 0.5 vvm and (D) 1.0 vvm. Symbols: glycerol
(closed triangle down), cell dry weight (circle semi-filled left), PDO (open circle) and BDO (closed circle).