Abstract
This seminar presents a conceptual model of the sequence of primary light induced electron transfer (ET) steps in photosynthetic bacteria. The temperature dependence of some of these redox reactions, like ET process between cytochrome and bacteriochlorophyll in Chromatium, is characterized by a temperature-independent rate at low temperatures and exhibits the Arrhenius-type dependence at high temperatures. The other primary ET processes, like an ET reaction between bacteriopheophytin and Fe-quinone complex in Rps. spheroides, are temperature-independent in the broad range of 4–300K. The third type of ET processes, exemplified by back ET reactions between Fe-quinone and bacteriochlorophyll in Rhs. rubrum, exhibits negative activation energy at high temperatures.
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