By a News Reporter-Staff News Editor at Life Science Weekly -- New research on Nanoparticles is the subject of a report. According to news originating from Peterborough, Canada, by NewsRx correspondents, research stated, "The purpose of this study was to investigate the 48 h acute toxicity of capped silver nanoparticles (AgNPs), and capped and uncapped titanium dioxide (nTiO(2)) to Daphnia magna neonates. In addition, a 24 days chronic toxicity study was performed for D. magna exposed to uncapped nTiO(2) to evaluate effects on growth, reproduction and survival."
Our news journalists obtained a quote from the research from the University of Trent, "The 48 h median lethal concentrations (LC50) for carboxy-functionalized capped AgNPs and uncapped nTiO(2) were 2.75 mu g/L and 7.75 mg/L, respectively. In contrast, no mortalities were observed for Daphnia exposed to carboxy-functionalized capped nTiO(2) at concentrations up to 30 mg/L. In the chronic toxicity experiment with uncapped nTiO(2), the growth, reproduction and survival of D. magna were significantly (p < 0.05) reduced at concentrations ranging from 4.5 to 7.5 mg/L. Growth and reproduction were reduced by 35 % and 93 %, respectively in the treatments at the highest uncapped nTiO(2) concentration (7.5 mg/L). Time to first reproduction was delayed by 2-3 days in D. magna and the test organisms produced only 1-2 broods over 24 days exposure to the highest concentration of uncapped nTiO(2)."
According to the news editors, the research concluded: "Overall, the results from the present study indicate that exposures of aquatic invertebrates to nanoparticles could have important ecological effects on lower trophic levels in aquatic ecosystems."
For more information on this research see: Toxicity of Silver and Titanium Dioxide Nanoparticle Suspensions to the Aquatic Invertebrate, Daphnia magna. Bulletin of Environmental Contamination and Toxicology, 2013;91(1):76-82. Bulletin of Environmental Contamination and Toxicology can be contacted at: Springer, 233 Spring St, New York, NY 10013, USA. (Springer - www.springer.com; Bulletin of Environmental Contamination and Toxicology - www.springerlink.com/content/0007-4861/)
The news correspondents report that additional information may be obtained from P. Das, Trent Univ, Dept. of Biol, Peterborough, ON K9J 7B8, Canada. Additional authors for this research include M.A. Xenopoulos and C.D. Metcalfe (see also Nanoparticles).
Keywords for this news article include: Canada, Ontario, Chemicals, Chemistry, Peterborough, Nanotechnology, Titanium Dioxide, Emerging Technologies, North and Central America
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