[Effect of a magnetic field on the fluorescence yield of Rhodopseudomonas sphaeroides cells of the wild strain and strain R-26. Relationship to temperature].

Fluorescence yield of Rhodopseudomonas sphaeroides cells whose primary acceptor is chemically reduced depends on the magnetic field tension. The maximal value of relative magnetic effect and the field value, at which the effect amounts to a half of the maximal value for R. sphaeroides wild strain and R-26, equal 3.6 and 1.1%; 260 and 120 G correspondingly at 295 K. An effect of th magnetic field on fluorescence yield for R. sphaeroides wild strain at the medium potential 300 mV was observed. The values of relative magnetic effect were shown to change within the temperature range 295-120 K. The results obtained are discussed in terms of the relationship between these parameters and the velocity constant values of the radical paris recombination (P 870(+) . Bph(-) . in singlet and triplet states and the value of metabolic interaction in the radical pairs (P 870(+) . Bph(-) .) and (Bph(-) . --X(-) .).