Substrates:
1, 6 – pure glycerol; 2, 7 – crude glycerol (from biodiesel production);
3, 8 – powdered whey; 4, 9 – powdered whey and
pure glycerol; 5, 10 – powdered whey and crude glycerol.
*Carbon source content correspond to lactose and glycerol concentrations
in appropriate substrates.