“…The study of EPL revealed some thermodynamic features of electron transport in PS I and PS H (van Gorkom et al, 1986;Vos andVan Gorkom, 1988, 1990) and established the electrophoretic and diffusional mobilities of PS I in the photosynthetic membrane (Brumfeld et al, 1989). Moreover, by using the EPL as an intrinsic voltage-sensitive optical probe, the electrical properties of the photosynthetic membrane were examined (Farkas et al, 1984a), electroporation characteristics of the photosynthetic membrane were explored (Farkas et al, 1984b;Korenstein et al, 1984;Rosemberg and Korenstein, 1990b) and ionophore-mediated ion ransport was studied (Farkas et al, 1982;Rosemberg and Korenstein, 1990a The present study employs the unique features of the EPL, which depend both on photosynthetic activity and on the conductance of the photosynthetic membrane, to elucidate stctural changes both in protein and the lipid-protein domains imposed by high electric fields.…”