Fig. 4From: Carbon source priority and availability limit bidirectional electron transfer in freshwater mixed culture electrochemically active bacterial biofilmsThe representative cyclic voltammograms obtained for S1, S2 and S3-BES over the course of HBPR after each polarization stage. left – 1st cycle, right – 4th cycle. Black line – after EWE = − 0.5 V; blue line – after EWE = + 0.2 VBack to article page