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American Chemical Society's Weekly PressPac -- Jan. 28, 2009
Date:2/2/2009

cientists exposed two common types of bacteria that serve as models of cell toxicity and indicators of environmental health to QDs under different conditions of acidity and alkalinity. At near neutral pH levels, bacteria exposed to QDs experienced decreased rates of growth, but did not die. However, at moderately acidic or alkaline conditions, many of the QD-exposed bacteria died as QDs shells decomposed, releasing their content of toxic metals. However, proteins and natural organic matter may be able to mitigate toxicity by complexing metal ions or coating particles. The study cautions, "the release of toxic inorganic constituents during their weathering under acidic or alkaline conditions in the human body or the environment may cause unintended harm that might be difficult to predict with short-term toxicity tests." - MTS

ARTICLE #4 FOR IMMEDIATE RELEASE
"Quantum Dot Weathering Results in Microbial Toxicity"

DOWNLOAD FULL TEXT ARTICLE http://pubs.acs.org/stoken/presspac/presspac/full/10.1021/es8023385

CONTACT:
Pedro J. Alvarez, Ph.D.
Rice University
Houston, Texas 77005
Phone: 713-348-5903
Fax: 713-348-5203
Email: alvarez@rice.edu


ARTICLE #5 EMBARGOED FOR 9 A.M., EASTERN TIME, Feb. 2, 2009

New NASCAR materials may save lives on the race track and highway
Chemical & Engineering News

New materials for NASCAR promise to save lives and reduce injuries in automobile racing a popular sport with a fan-base of 75 million and everyday driving, according to an article scheduled for the Feb. 2 issue of Chemical & Engineering News, ACS' weekly newsmagazine. NASCAR's new racing season begins Feb. 7.

In the magazine's cover story, C&EN Associate Editor Bethany Halford points out that for many years NASCAR (the Nati
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Contact: Michael Woods
m_woods@acs.org
202-872-4400
American Chemical Society
Source:Eurekalert  

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