Fig. 3
Kinetics of rhodopsin and N-ret-PE photoisomerization. Protonated at-N-ret-PE and rhodopsin were exposed to 450-nm or 500-nm monochromatic light respectively at the same photon flux for the indicated times. The initial amounts of at-N-ret-PE and rhodopsin are represented by a 0, and the amounts at time t by a t. The first-order rate constant (k) is described by: kt =  −In(a t/a 0). Here, the slopes of the plots −In(a t/a 0) versus t yield the rate constants k (N-ret-PE) and k (rhod). Each data point is shown as the mean ± s.e.m. (n = 3). The rate constants are also shown as mean ± s.e.m
