Fig. 1
Action spectrum for photoisomerization of protonated at-N-ret-PE. Protonated at-N-ret-PE in acidified methanol was incubated in the dark or under monochromatic light of the indicated wavelengths and the same photon flux. a Molar composition of 11c-, 9c- and 13c-N-ret-PE isomers following the incubation in light. The dark background level of each isomer was subtracted. Note the 37-fold higher level of 11c- versus 13c-N-ret-PE in the 450-nm samples. b Molar amounts of at-N-ret-PE remaining after incubation in the dark or in light of the indicated wavelengths. Data are plotted as mean ± s.d. (n = 3)
