News Column

Researchers from North Carolina State University Report New Studies and Findings in the Area of Heavy Metals

May 6, 2014

By a News Reporter-Staff News Editor at Life Science Weekly -- Data detailed on Heavy Metals have been presented. According to news reporting originating from Morehead City, North Carolina, by NewsRx correspondents, research stated, "Continued development, use, and disposal of quantum dots (QDs) ensure their entrance into aquatic environments where they could pose a risk to biological organisms as whole nanoparticles or as degraded metal constituents. Reproductive Fundulus heteroclitus were fed a control diet with lecithin, diets containing 1 or 10 mu,g of lecithin-encapsulated CdSe/ZnS QD/day, or a diet containing 5.9 mu g CdCl2/day for 85 days."

Our news editors obtained a quote from the research from North Carolina State University, "Cadmium concentrations in liver, intestine, and eggs were quantified with inductively coupled plasma mass spectrometry. In fish fed 10 mu g QD/day, QDs or their degradation products traversed the intestinal epithelia and accumulated in the liver. Less than 0.01% of the QD's cadmium was retained in the liver or intestinal tissues. This compares to 0.9% and 0.5% of the cadmium in the intestine and liver, respectively of fish fed a CdCl2 diet. Cadmium was also detected in the eggs from parents fed 10 mu g QD/day. No significant changes in hepatic total glutathione, lipid peroxidation, or expression of genes involved in metal metabolism or oxidative stress were observed."

According to the news editors, the research concluded: "While QDs in the diet are minimally bioavailable, unusual levels of vitellogenin transcription in male fish as well as declining fecundity require further investigation to determine if endocrine disruption is of environmental concern."

For more information on this research see: Dietary CdSe/ZnS quantum dot exposure in estuarine fish: Bioavailability, oxidative stress responses, reproduction, and maternal transfer. Aquatic Toxicology, 2014;148():27-39. Aquatic Toxicology can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier -; Aquatic Toxicology -

The news editors report that additional information may be obtained by contacting T.M. Blickley, North Carolina State University, Center Marine Sci & Technol, Morehead City, NC, United States. Additional authors for this research include C.W. Matson, W.N. Vreeland, D. Rittschof, R.T. Di Giulio and P.D. McClellan-Green (see also Heavy Metals).

Keywords for this news article include: Cadmium, Heavy Metals, Quantum Dots, Morehead City, United States, North Carolina, Nanotechnology, Transition Elements, Emerging Technologies, North and Central America

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Source: Life Science Weekly

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