Fig. 4. Cell potential (Ecell) (n) and Power (P) (C) as a function of the current (I) in the photosynthetic bioelectrochemical cell at different external resistance. Anode: [Chl]t 5 50 mM (as whole cell cyanobacteria), [DMBQ]t 5 0.5 mM. Cathode: [BOD]t 5 0.1 mM, [ABTS2–]t 5 0.5 mM.