Noteworthy, ethanol yields on sugar for S. cerevisiae strains under
these experimental conditions were quite below normal values under
anaerobic conditions (about 0.45 g/g). This was only partly explained
by alcohol stripping(datanotshown),and indicates a significant contri-
bution of respiratory metabolism. However, the acetic acid yield for
both S.cerevisiaestrains was extremely highundertheseaerated condi-
tions (Table 2), and the resulting increase in volatile acidity would pre-
clude any practical application of the respiratory capacity of these