... optical density, the concentrations of nitrate [17] and nitrite [18], the pO2 and the pH of the medium weremonitored, and the composition of the gaseous phase in the fermentor was analyzed by mass ... presence and absence of substrate) using the values computed by Nicholson and Shain, and plotted vs. the inverse of the scan rate. The plotsyielded straight lines, confirming the applicability of the Nicholson ... Quı´mica, Faculdade de Cieˆnciase Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal;3Facultad de Bioquı´mica y Ciencias Biolo´gicas, Universidad Nacional del Litoral, Santa Fe, ArgentinaThe...