A microorganism is grown in a batch culture using glucose as a carbon source. The apparent growth yield is 0.5 g biomass / g substrate. The initial concentrations of biomass and substrate are 2 g L\(^{-1}\) and 200 g L\(^{-1}\), respectively. Assuming that there is no endogenous metabolism, the maximum biomass concentration that can be achieved is _________ g L\(^{-1}\).