Additional file 2: Fig. S2. C. thermocellum growth profile in terms of production of metabolites (ethanol + acetic acid + lactic acid) and pellet nitrogen content (g/L) as a proxy for cell growth for 24 h under growth conditions in a bottle with 200 mL working volume and 5 g/L glucan Avicel® PH-101 loading without active pH control in MOPS buffer. Measured in triplicates from one culture bottle