Fig. 6From: Metabolism, morphology and transcriptome analysis of oscillatory behavior of Clostridium butyricum during long-term continuous fermentation for 1,3-propanediol productionExpression levels of genes involved in glycerol metabolism (a) and stress response (b) for C. butyricum S3 at five time points (from left to right: 528 h, 536 h, 552 h, 561 h and 567 h) during an oscillation cycle. Operating condition: continuous fermentation at a glycerol feed concentration of 88 g/L and a dilution rate of 0.048 h−1Back to article page