Figure 4From: A comparative study of ethanol production using dilute acid, ionic liquid and AFEX™ pretreated corn stoverFermentation product and cell growth profiles for three different pretreated corn stover hydrolysates. (I) DA, (II) IL and (III) AFEX. (A) Without external nutrients and (B) with external nutrient supplementation. AFEX, ammonia fiber expansion; DA, dilute acid; IL, ionic liquid.Back to article page