Doklady Biochemistry and Biophysics

, Volume 485, Issue 1, pp 135–137 | Cite as

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

  • I. B. Klenina
  • A. A. Gryaznov
  • Z. K. Makhneva
  • I. I. ProskuryakovEmail author


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.



This study was supported by the Russian Science Foundation (project no. AAAA-A17-1170301 10140-5).


The authors declare that they have no conflict of interest. This article does not contain any studies involving animals or human participants performed by any of the authors.


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Copyright information

© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  • I. B. Klenina
    • 1
  • A. A. Gryaznov
    • 1
  • Z. K. Makhneva
    • 1
  • I. I. Proskuryakov
    • 1
    Email author
  1. 1.IBBP RASPushchinoRussia

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