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Contrasting irradiation of senescent cells of the diatom Thalassiosira sp. in association with the bacterium Pseudomonas stutzeri showed the effect of intensity of irradiance on the transfer of singlet oxygen (1O2) to bacteria attached to phytoplanktonic cells. Under low irradiances, 1O2 is produced slowly, favors the oxidation of algal unsaturated lipids (photodynamic effect), and limits 1O2 transfer...