Figure 3

Butanol productivity (g/L h) versus Butanol concentration (g/L) of Clostridium species growing on lactose medium. Circle: Batch fermentation; Square: Continuous fermentation; Triangle: Fermentation coupled with an in situ recovery process. Green: C. acetobutylicum P262 strain; Red: C. acetobutylicum ATCC 824 strain; Yellow: C. acetobutylicum NCIB 2951 strain; Blue: C. beijerinckii. Numbers: references.