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- W4324304814 abstract "Abstract Plastic nanoparticles (NPs) are the final state of plastic degradation in the environment before they disintegrate into low‐molecular‐weight organic compounds. Unicellular organisms are highly sensitive to the toxic effects of nanoplastics, because they are often capable of phagotrophy but are unable to consume a foreign material such as synthetic plastic. We studied the effect of polystyrene, poly(vinyl chloride), poly(methyl acrylate), and poly(methyl methacrylate) NPs on the photosynthetic dinoflagellate Gymnodinium corollarium Sundström, Kremp et Daugbjerg. Fluorescent tagged particles were used to visualize plastic capture by dinoflagellate cells. We found that these dinoflagellates are capable of phagotrophic nutrition and thus should be regarded as mixotrophic species. This causes their susceptibility to the toxic effects of plastic NPs. Living cells ingest plastic NPs and accumulate in the cytoplasm as micrometer‐level aggregates, probably in food vacuoles. The action of nanoplastics leads to a dose‐dependent increase in the level of reactive oxygen species in dinoflagellate cells, indicating plastic degradation in the cells. The introduction of a methyl group into the main chain in the α‐position in the case of poly(methyl methacrylate) causes a drastic reduction in toxicity. We expect that such NPs can be a tool for testing unicellular organisms in terms of heterotrophic feeding ability. We suggest a dual role of dinoflagellates in the ecological fate of plastic waste: the involvement of nanoplastics in the food chain and its biochemical destruction. Environ Toxicol Chem 2023;42:1124–1133. © 2023 SETAC" @default.
- W4324304814 created "2023-03-16" @default.
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- W4324304814 date "2023-04-12" @default.
- W4324304814 modified "2023-09-26" @default.
- W4324304814 title "Uptake and Effects of Nanoplastics on the Dinoflagellate <i>Gymnodinium corollarium</i>" @default.
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- W4324304814 doi "https://doi.org/10.1002/etc.5604" @default.
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