Abstract

1. Introduction In photosynthetic systems, band shifts of the endogenous bulk carotenoids [see refs. 1 -lo] have been considered by several authors to be a response to delocalized electric field changes [3-71. Evidence for this interpretation has come from the induction of the shifts by light [3-51 and diffusion potentials from ion gradients [6,7]. Recently, however it has been shown [8] , that carotenoid band shifts could also occur at the more localized

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