Figure 3
From: Detection of fast light-activated H+ release and M intermediate formation from proteorhodopsin.
Dependence on pH of the M-like intermediate of pR. Time courses of flash-induced absorbance changes measured at 400 nm and 22°C for pR in 1% DHPC/100 mM NaCl solution at pH 6.5, 8.0 and 9.5. A positive differential absorbance at 400 nm is indicative of the presence of the M intermediate. The logarithmic time scale ranges from 100–107 μs after photolysis by a 10-ns laser pulse at 500 nm, with an energy of 3–6 mJ.