You are culturing a specific yeast in a fermenter. The q02 of this yeast is 10mmolO2/(g cell*hour). The kla is 20/hr for the agitation speed and the air flow rate in the fermenter. The critical dissolved oxygen concentration (CL) is 0.2mg/L and the solubility of oxygen (C) from the air in the reactor is 7mg/L. At steady state, what would be the maximum cell concentration for this fermenter to sustain? Assume you keep the dissolved oxygen level the same, what oxygen solubility do you need to sustain 1mg/L of cell concentration at steady state