Fig. 3.

Schematic representation of 2 simple models for the exciton transfer in PSI. The number of the participating Chla molecules were reduced to the minimal number sufficient for the qualitative description of the observed anticorrelation of the emission intensities given in Fig. 1; those are C708, C715/C719, and main antenna states (T. elongatus), the appropriate quantities for Synechocystis sp. PCC 6803 are C706, C714, and main antenna states. Model1 illustrates a linear downhill EET from antenna states through the C708 pool into the C715/C719. Model2 illustrates a direct feeding of the pools C708 and C715/C719 by energetically higher lying antenna states.