Kinetics equation replacement function for a particular continuous intake scenario.

An important paper by Skrable et al. included a retention function for compartment contents during a continuous intake, including the same time variable in both the numerator and denominator of the replacement function. In fact, the time in the denominator should have been represented as a constant describing the ultimate period length for the continuous intake, whether greater than, less than, or equal to the time variable for the associated measurement.