kin	deactivation constant.
Km	affinity constant.
Ks	substrate inhibition constant.
m	deactivation order.
n	reaction order value affecting the concentration of substrate and affinity constant.
r and rs	the specific consumption rate of substrate i.
rx	the specific rate of biomass formation.
rmax	the maximum specific consumption rate of substrate i.
[Si]	the concentration of substrate i.
X	the concentration of biomass.
Yx/s	biomass yield from substrate.
µ	the specific rate of biomass formation.
µmax	the maximum specific rate of biomass formation
θX	dimensionless cell deactivation.
θss	residual dimensionless activity.