TRS0 ¼ initial concentration of TRS; TRSf ¼ TRS concentration at the end of fermentation; QS ¼ volumetric rate of TRS consumption; P0 ¼ initial ethanol concentration;
Pmax ¼ ethanol concentration at the end of fermentation; QP ¼ global volumetric productivity; YP/S ¼ product yield; X0 ¼ initial biomass concentration; X ¼ biomass concentration
at the end of fermentation; QX ¼ biomass volumetric productivity; YX/S ¼ biomass yield; qS ¼ specific volumetric rate of TRS consumption; qP ¼ specific ethanol
productivity.