Fig. 3From: Microalgal upgrading of the fermentative biohydrogen produced from Bacillus coagulans via non-pretreated plant biomassBiohydrogen production from Bacillus coagulans using Calotropis procera different substrate concentrations a, different pH b and different temperatures c. *; represents a significantly different at (p ≤ 0.05) based on Duncan’s multiple range testBack to article page