[Relation of cyclic and noncyclic electron transport in Rhodospirillum rubrum chromatophores. I. Experimental study of the kinetic characteristics of dark reduction of P870 with different donor concentrations in the medium].

The kinetics of the dark recovery of photo-oxidized bacteriochlorophyll P870 was studied as a function of the intensity and duration of actinic light illumination at different concentrations of a donor in the medium. From the comparison of the experimental data with the results of mathematical modelling of the processes under investigation [1] it is concluded that electron transport is triggered for another pathway, whenever the concentration of the donor in the medium attains a certain critical level.