Quenching with Oxygen of the Triplet State of Spheroiden in the Reaction Centers of C. sphaeroides in the Temperature Range 0–45°C

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Abstract

The efficiency of quenching with dissolved oxygen of the triplet state of the carotenoid spheroiden ([T]Car) in the photosynthetic reaction center of purple bacteria Cerebacter (Rhodobacter) sphaeroides in the temperature range from 0°C to +45°C was investigated. For the possibility of [T]Car formation during light excitation of the reaction center, o-phenanthroline (10[−][2] M) was added to the preparations, partially displacing the primary quinone acceptor from the structure of reaction center. The activation energies of the process of [T]Car quenching under normal aerobic conditions and with partial degassing of the studied samples were determined.

About the authors

P. P Knox

Lomonosov Moscow State University

Email: knox@biophys.msu.ru
Moscow, Russia

I. A Yaroshevich

Lomonosov Moscow State University

Moscow, Russia

E. P Lukashev

Lomonosov Moscow State University

Moscow, Russia

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