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(•) Action spectrum of bacteriorhodopsin in purple membranes adsorbed on nano-BLMs presented as the normalized maximum initial current density (Jmax/Jmax(max)) measured with a series of narrow-band interference filters. The maximum current densities were corrected by the lamp spectrum. A Gaussian function was fitted to the data, shown as a dashed line. The solid line shows the normalized absorption spectrum (ɛ/ɛ(max)) of a purple membrane suspension.
