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THERMOLUMINESCENCE and OXYGEN EVOLUTION FROM A THERMOPHILIC BLUE‐GREEN ALGA OBTAINED AFTER SINGLE‐TURNOVER LIGHT FLASHES *
Author(s) -
Jee Govind,
Koike H.,
Inoue Y.
Publication year - 1985
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1985.tb01613.x
Subject(s) - thermoluminescence , spinach , oxygen evolution , mesophile , oxygen , recombination , acceptor , thylakoid , thermophile , photosynthesis , chemistry , photosystem ii , dcmu , photochemistry , botany , analytical chemistry (journal) , luminescence , biology , physics , chloroplast , environmental chemistry , optics , biochemistry , bacteria , enzyme , genetics , condensed matter physics , electrochemistry , organic chemistry , electrode , gene
— Oxygen evolution and thermoluminescence (TL) studies on a thermophilic blue‐green alga Synechococcus vulcanus Copeland revealed the following: (a) The deactivations of the S 3 and S 2 states of the Oxygen Evolving Complex, at room temperature, have half‐times of ∼200 and 75 s, respectively, instead of 30 and 20 s found in mesophilic plants, (b) The TL band(s) “B”, due to the recombination of the state S 2 or S 3 and Q B , the reduced secondary quinone acceptor, is(are) at50–55°C instead of25–30°C; the intensity of this band oscillates with a period of 4 with maxima on the 2nd and the 6th flashes, (c) The TL band “D” in the presence of diuron, due to the recombination of S 2 and the reduced primary quinone acceptor Q A , − occurs at ∼35°C instead of0–10°C. (d) Furthermore, the ratio of Q B − to Q B in dark‐adapted S. vulcanus cells is close to 1 as in intact spinach leaves, but not 0.43 as in isolated thylakoids from spinach.