No abstract

No abstract

No abstract

Abstract— Oxygen evolution and thermoluminescence (TL) studies on a thermophilic blue‐green alga Synechococcus vulcanus Copeland revealed the following: (a) The deactivations of the S3 and S2 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 S2 or S3 and QB, 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 S2 and the reduced primary quinone acceptor QA,− occurs at ∼35°C instead of0–10°C. (d) Furthermore, the ratio of QB− to QB 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.

No abstract