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Environmental Feedbacks and Engineered Nanoparticles: Mitigation of Silver Nanoparticle Toxicity to Chlamydomonas reinhardtii by Algal-Produced Organic Compounds

Stevenson, L.M.; Dickson, H.; Klanjšček, Tin; Keller, A.A.; McCauley, E.; Nisbet, R.M. (2013) Environmental Feedbacks and Engineered Nanoparticles: Mitigation of Silver Nanoparticle Toxicity to Chlamydomonas reinhardtii by Algal-Produced Organic Compounds. PLoS ONE, 8 (9). e74456/1-e74456/7. ISSN 1932-6203

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Abstract

The vast majority of nanotoxicity studies measures the effect of exposure to a toxicant on an organism and ignores the potentially important effects of the organism on the toxicant. We investigated the effect of citrate-coated silver nanoparticles (AgNPs) on populations of the freshwater alga Chlamydomonas reinhardtii at different phases of batch culture growth and show that the AgNPs are most toxic to cultures in the early phases of growth. We offer strong evidence that reduced toxicity occurs because extracellular dissolved organic carbon (DOC) compounds produced by the algal cells themselves mitigate the toxicity of AgNPs. We analyzed this feedback with a dynamic model incorporating algal growth, nanoparticle dissolution, bioaccumulation of silver, DOC production and DOC-mediated inactivation of nanoparticles and ionic silver. Our findings demonstrate how the feedback between aquatic organisms and their environment may impact the toxicity and ecological effects of engineered nanoparticles.

Item Type: Article
Uncontrolled Keywords: Nanoparticles; Chlamydomonas reinhardtii; dissolved organic carbon
Subjects: NATURAL SCIENCES > Biology
Divisions: Division for Marine and Enviromental Research
Projects:
Project titleProject leaderProject codeProject type
Ekološko modeliranje za održivo upravljanje resursima[25590] Tarzan Legović098-0982934-2719MZOS
Depositing User: Tin Klanjšček
Date Deposited: 08 Jul 2015 11:32
Last Modified: 08 Jul 2015 11:32
URI: http://fulir.irb.hr/id/eprint/2028
DOI: 10.1371/journal.pone.0074456

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