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. 2019 Mar;485(1):135-137.
doi: 10.1134/S1607672919020169. Epub 2019 Jun 14.

Singlet-triplet Fission of Carotenoid Excitation in the Purple Phototrophic Bacteria Thermochromatium tepidum

I B Klenina  1 , A A Gryaznov  1 , Z K Makhneva  1 , I I Proskuryakov  2
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Singlet-triplet Fission of Carotenoid Excitation in the Purple Phototrophic Bacteria Thermochromatium tepidum

I B Klenina et al. Dokl Biochem Biophys. 2019 Mar.

Abstract

Singlet fission of carotenoid excitation is studied in purple phototrophic bacterium Thermochromatium tepidum. Using time-resolved EPR and magnetic field-induced modulation of fluorescence yield it is shown that the concept of intramolecular excitation fission developed in a number of publications is not supported by the experimental results. The obtained data favor intermolecular fission mechanism involving two carotenoid molecules.

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