Fig. 1From: High-level fed-batch fermentative expression of an engineered Staphylococcal protein A based ligand in E. coli: purification and characterizationOptical density (OD) and biomass change in time during fermentation. X-axis shows time in hours. Y-axis at the left side shows stirrer speed (RPM) and dissolved oxygen concentration (%) and Y-axis at the right side shows biomass accumulation and feed over the time. Accretion of biomass is related with increase of OD600 Back to article page