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. 2015 Sep 3;6:909. doi: 10.3389/fmicb.2015.00909

FIGURE 2.

FIGURE 2

Electron transfer rates (A) from the microbial mat to the electrode in the anodic (AN) mat and (B) from the electrode to the microbial mat in the cathodic (CAT) mat. Both systems showed the cyclic fluctuation of current which is also referred to as the diel cycle.