Figure 1

Composition of bacterial community in two mesophilic propionate-fed chemostats. (a) PL chemostat: operated at a dilution of 0.05 d−1; (b) PH chemostat: operated at a dilution of 0.15 d−1. *Unclassified Spirochaetaceae_1 and unclassified Spirochaetaceae_2* were two different genera affiliated to the family Spirochaetaceae.