Figure 4From: Enhanced photo-fermentative H2 production using Rhodobacter sphaeroides by ethanol addition and analysis of soluble microbial productsThe mass of organic matter (as dissolved organic carbon) according to molecular weight distribution of SMPs. (a) in the absence (control), and (b) presence of 0.2% ethanol at 6, 32, and 72 h fermentation.Back to article page