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The O 2  yield under flash light illumination in preparations of Anacystis nidulans was examined in the presence of redox components such as ferricyanide and ferrocyanide. When ferricyanide (1 mᴍ) was added to the lyophilized, lysozyme treated and EDTA washed cells of A. nidulans the familiar Joliot-Kok oscillalion with maximum on the third flash and periodicity of four was observed (in the presence of added CaCl 2  and MnCl 2 ). However, when the ferricyanide con­centration was increased to about 8 mᴍ , a reduction of the O 2  evolution under flash illumination was observed, and an O 2  uptake could clearly be seen under the first and second flash. This O 2  uptake was inhibited by DCMU and o-phenanthroline, but was not influenced by KCN or salicylhydroxamic acid. As ferrocyanide was progressively added to 1 mᴍ ferricyanide, the oscillations faded out and the steady-state O 2  evolution decreased. Light would progressively increase the O 2  evolution and reduce the damping of the oscillations.

Studies on the O 2 Evolution under Flash Light Illumination in Preparations of Anacystis nidulans