http://ecru.scout.wisc.edu// Recent updates related to UW NSEC Thrust Four Highlights http://ecru.scout.wisc.edu//images/uw_nsec_rss_header.gif http://ecru.scout.wisc.edu// 200 69 UW NSEC RSS Header en-us nealey@engr.wisc.edu (Paul Nealy) nealey@engr.wisc.edu (Paul Nealy) Tue, 24 Nov 2009 12:17:43 -0600 http://backend.userland.com/rss092 http://ecru.scout.wisc.edu//NS--Nugget.php?ID=46 <table align="right" style="width: 610px;" cellpadding="0" cellspacing="0"><tr> <td><img class="imagebox" src="UploadedPics/NS--biomimetic assay.jpg" alt="" /></td> </tr><tr> <td><p><em>Figure 1. (a) UV-visible absorption spectra of PEG5000-CdSecore/ZnSshell quantum dots (QDs) exposed to methoxyhydroquinone (MHQ)-driven Fenton’s reaction. All reactions were conducted in 10 mM acetate buffer (pH 4.1). (b) Concentrations of Cd from PEG5000-QDs exposed to H2O2 and (MHQ-driven) Fenton’s reagent, then filtered through a 10-kDa centrifugal concentrator (retaining particles with diameters &#8805; 3 nm). (c) Transmission electron micrograph of nanoparticle aggregates obtained after overnight exposure of PEG5000-CdSecore/ZnSshell QDs to the MHQ-driven Fenton’s reaction. The dotted circle in (c) represents the area used in analysis by selected area electron diffraction (inset) and energy dispersive X-ray spectroscopy (not shown). Figure adapted from Metz et al. Environ. Sci. Technol.43, 1598-1604, 2009.</em></p></td></tr></table>Kevin M. Metz, Andrew N. Mangham, Matthew J. Bierman, Song Jin, Robert J. Hamers, and Joel A. PedersenOnce released into the environment, engineered nanomaterials may be transformed by microbially mediated redox processes altering their toxicity and fate. Little information currently exists on engineered nanomaterial transformation under environmentally relevant conditions. We developed an in vitro biomimetic assay for investigation of nanomaterial transformation under simulated oxidative.... Tue, 04 Aug 2009 11:05:09 -0500