Microorganism
The strain used throughout this work was Acetobacter aceti NRRL B-999. This strain was
kindly provided in lyophilized form from ARS culture collection (Peoria, IL, USA). The
lyophilized cells were activated first in Yeast Peptone mannitol medium (YPM) and
cultivated in incubator shaker for 24 h at 28°C. The obtained cells were subcultured on YPM
medium supplemented with agar 20 g/L. The grown colonies were harvested in 50 %
glycerol and subsequently stored in cryovials for cell banking at -80 °C to minimize the
productivity loss by subsequent cultivations of cells. Each experiment was started by revival
of one glycerol vial in vegetative culture.