Fig.5From: Optimization of Clostridium beijerinckii semi-solid fermentation of rape straw to produce butyric acid by genome analysisResponse surface interaction diagram. (A metal ions and ammonium acetate; B tryptophan and ammonium acetate; C L-cysteine hydrochloride and ammonium acetate; D L-cysteine hydrochloride and metal ions; E L-cysteine hydrochloride and tryptophan; F Metal ions and tryptophan)Back to article page