Fig. 1: Conceptual model of directional long-distance ET chain along subsurface redox gradient.
From: Directional long-distance electron transfer from reduced to oxidized zones in the subsurface
The red circles in the left conceptualize the series of short-distance ET (electron transfer) between connected redox couples from low to high reduction potentials. The redox couples in the right present the biological and chemical mechanisms for the ET.
