SEARCH Articles Figures Tables Acetone-butanol production, extractive Acetone-butanol production, extractive systems Biofuel production butanol Butanol Production by Engineered Microbes Butanol and isobutanol production Butanol biochemical production Butanol, degradation product Butanols global production Clostridium acetobutylicum butanol production Production acetone+butanol+ethanol Production isobutanol+butanol+ethanol