Light curve of the multicentral model of photosynthetic unit (PSU) has been obtained. The shape of the curve depends on the efficiency of energy migration between PSU--for the unicentral PSU, and on the number of traps for multicentral PSU. The criteria distinguishing between the two models are proposed. If the efficiency of energy migration between PSU is no more than 0,7, then, there exist ony unicentral and bicentral PSU.
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