The toxic impact of a mixture of polychlorinated biphenyls Aroclor 1254 (PCB) on the luminescence characteristics of the ctenophores Mnemiopsisleidyi A. Agassiz was studied. The control group was kept in an aquarium without a toxicant; experimental individuals were placed in three aquariums with water with PCB concentrations of 1, 10, and 100 µg -1 with an exposure of 15, 30, 40 and 60 minutes. Bioluminescence of M. leidyi was studied using the “Svet” complex. The toxic impact of PCBs caused a decreased amplitude and duration of luminescence at all given concentrations, whereas one-hour exposure to mechanical agitation resulted in a maximum decrease by 35% in the glow duration. At a PCB concentration of 1 μg ∙ L -1 , a maximum decrease in the luminescence intensity by a factor of 20 was observed compared with the control group.
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