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New Findings on Silver Nanoparticles from University of Montreal Summarized

February 18, 2014

By a News Reporter-Staff News Editor at Life Science Weekly -- New research on Silver Nanoparticles is the subject of a report. According to news reporting originating in Montreal, Canada, by NewsRx journalists, research stated, "The bioavailability of a small silver nanoparticle (nAg; nominal size of 5 nm with a polyacrylate coating) by the green alga C. reinhardtii was investigated in order to assess the contributions of Ag+ and nAg to cellular internalization. Upon exposure to nAg, Ag biouptake exceeded what was predicted based upon measured Ag+ concentrations."

The news reporters obtained a quote from the research from the University of Montreal, "Indeed, although Ag biouptake was greatly reduced when excess cysteine was added to the nAg, it was nonetheless significantly above control levels. For both exposures to nAg and Ag+, expression levels of the Copper Transport Protein 2 (CTR2) indicated that Ag biouptake could be attributed to the internalization of Ag+. Exposure to Ag+ or nAg increased CTR2 expression, even when cysteine was present with the nAg. Darkfield microscopy coupled with hyperspectral imagery showed that the presence of silver nanoparticles inside the cells was More likely due to the rereduction of Ag+ than to the internalization of nAg."

According to the news reporters, the research concluded: "The weight of evidence indicated that nAg increased Ag biouptake by locally increasing the surface concentrations of Ag+."

For more information on this research see: Bioaccumulation of Nanosilver by Chlamydomonas reinhardtii-Nanoparticle or the Free Ion? Environmental Science & Technology, 2014;48(1):358-364. Environmental Science & Technology can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society -; Environmental Science & Technology -

Our news correspondents report that additional information may be obtained by contacting S. Leclerc, University of Montreal, Dept. of Chem, Biophys Environm Chem Grp, Montreal, PQ H3C 3J7, Canada (see also Silver Nanoparticles).

Keywords for this news article include: Quebec, Canada, Montreal, Nanosilver, Nanotechnology, Silver Nanoparticles, Emerging Technologies, North and Central America

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Source: Life Science Weekly

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