Effect of thallium toxicity in cyanobacteria
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The aim of this study was to elucidate the mechanism of thallium (Tl) ion toxicity in photosynthetic organisms. The physiological and biochemical responses to Tl exposure were analyzed in the cyanobacterium Synechocystis sp. PCC6803, which is a widely used model to study photosynthesis. We examined the photosynthetic activities of Tl+-exposed cells, the extent of Tl accumulation, and the properties of membrane lipids. Exposure to Tl+ at 2.0 and 5.0 for 24 h decreased the net photosynthetic activities of cells to 92% and 34%, respectively.
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