Figure 3.

Current-voltage characteristics on a large-area monolayer of bacteriorhodopsin. Measured I-V characteristics of the native and activated state of bR are compared with theoretical calculations carried out using the 2NTU and 2NTW structures for the native and activated states, respectively. (a) - Full squares (circles) refer to calculations of the native (activated) state) carried out with Φ = 53 meV the same for each barrier; continuous curves are guides to the eyes, dashed curves refer to experiments carried out on a monolayer of bR as schematically shown in the inset of the figure [4]. (b) - The same as Figure 3 with calculations carried out with an average Φ = 69 meV Gaussian distributed with a variance σ = 44 meV. All the calculated currents are normalized to the experimental value of current in dark at 1 V [14].