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Wei YAN, Linping KUAI; Comparison of effects of iodine-131 and uranium on Vibrio Qinghaiensis sp. Q67; Advanced Materials and Technologies Environmental Sciences; 2018:2(2):199-205
Effects of Na131I and UO2(NO3)2 on Vibrio Qinghaiensis sp. Q67 (a freshwater luminescent bacterium) were studied in the paper. Relative luminosity (Irel) was used as the tested physiological parameter. About Na131I solution, Four radioactive concentrations were designed. Irel was fluctuated as the activity under 1000Bq/ml and varied irregularly, while three successive stages in the bioluminescent response to Na131I at the activity over 5000Bq/ml were found: initial stage (stress recognition), hormesis stage (adaptive response) and inhibition stage (radiation toxicity). While to UO2(NO3)2, bioluminescence inhibition was observed under uranyl concentrations exceeding 0.05 ppm and for each concentration, Irel was approximate linear decrease over the exposure time. Furthermore, chosen the Irel at exposure 15min (Irel, 15) as the study target, a linear relationship was observed between Irel, 15 and the concentration of uranium from 0.05 to 1ppm. The main toxic factor was chemical component, not radiation.