The relative weight of the slowly decaying M intermediate of the photocycle of bacteriorhodopsin increases upon increasing the energy density of the short (10 ns) actinic laser pulse. Moreover, when a pre-exciting flash is applied to the BR sample, the absolute amplitude of the Ms is higher in the signal induced by a second flash, applied with a delay from 100 μs to 100 ms. These facts together prove that either the leftover BR ground-state population becomes different due to the pre-excitation, or there is a cooperative interaction between the BR molecules. © 1991.
Tokaji, Z., & Dancsházy, Z. (1991). Light-induced, long-lived perturbation of the photocycle of bacteriorhodopsin. FEBS Letters, 281(1–2), 170–172. https://doi.org/10.1016/0014-5793(91)80385-G