Past studies demonstrate that complexation will limit abiotic and biotic U(VI) reduction rates and the overall extent of reduction. However, the underlying basis for this behavior is not understood and presently unpredictable across species and ligand structure. The central tenets of these investigations are: (1) reduction of U(VI) follows the electron-transfer (ET) mechanism developed by Marcus; (2) the ET rate is the rate-limiting step in U(VI) reduction and is the step that is most affected by complexation; and (3) Marcus theory can be used to unify the apparently disparate U(VI) reduction rate data and as a computational tool to construct a predictive relationship.

Presentation for the 2005 University Scholars Day at the University of North Texas discussing research on lipids in Caenorhabditis elegans exposed to oxygen deprivation.

This Tech Talk presentation discusses digital resource management. Templates, validation, controlled vocabularies, analysis tools, graphical reports, and more are explained in this presentation.

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Presentation by Dr. Dan Arvizu of NREL given at the Colorado New Energy Summit held March 24, 2007 in Denver, Colorado.

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This presentation discusses what The Portal to Texas History is and the benefits that it provides to the community and to educators. It also illustrates how to use The Portal to Texas History, shows examples of the collections, and discusses future goals.

Presentation for the 2006 University Scholars Day at the University of North Texas discussing research on modeling and optimization of deflection slits for fast-pulsing of a low energy ion beam.

The summary of this report is: (1) biogenic flux increases as hydrologic residence time decreases; (2) reaction-based reactive transport modeling can capture this effect; (3) solid-phase Fe(III) bioreduction can be sustained at long residence times in natural sediments; and (4) long-term coupled Fe(III)/U(VI) bioreduction can be sustained in natural sediments.

This presentation on solar technologies and sustainability was given at the 17th Annual Rocky Mountain Land-Use Institute (RMLUI) Land-Use Conference.

Presentation for the 2007 University Scholars Day at the University of North Texas. This presentation discusses research on characterizing the changes in tissue morphology occurring in the emu ductus arteriosus during hatching and what role apoptosis plays during the process of the ductus closure.

Presentation for the 2005 University Scholars Day at the University of North Texas discussing research on the conflicted self in the life and art of Carlo Gesualdo.

Renewable portfolio standards (RPS) have rapidly developed momentum in certain sections of the United States and throughout the world, primarily in response to climate and energy security concerns. This presentation at the RPS Symposium, sponsored by the Electric Utility Consultants Inc., will discuss renewable energy financing and the economics of such policies.

The primary objective of this report is to evaluate the rates and mechanisms of U(VI) reduction by microbial populations.

Presentation on progress and possible scenarios towards meeting the 30x30 initiative proposed by President Bush

Cr alloys containing 0-30 weight % W were investigated for their high temperature strength and oxidation resistance. These experimental alloys are intended for use in elevated temperature applications. Alloys were melted in a water-cooled, copper-hearth arc furnace. Microstructure of the alloys was studied using X-ray diffraction, scanning electron microscopy, and light microscopy. Meyer and Vickers hardness tests were utilized for measuring room temperature strength. A hot hardness tester with a spherical ruby indenter was used to study the strength of these materials between 800ºC and 1200ºC. A parabolic relationship was observed between load and indent size at all temperatures. On the other hand, decrease in hardness of the alloys with temperature was linear up to 1200ºC.

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Presentation for the 2006 University Scholars Day at the University of North Texas discussing research on the geography of HIV in Dallas County, Texas from 1999-2003.

Poster presentation for the 2006 University Scholars Day at the University of North Texas discussing research on dissolved lithium concentrations and the spatial distribution of suicide mortality rates in Texas counties from 1980-1998.

Presentation for the 2005 University Scholars Day at the University of North Texas discussing the effects of mutual partner violence on women's mental health.

Presentation for the 2006 University Scholars Day at the University of North Texas discussing educating Latinos in the United States and the need for exposure, resources, and cultural understanding.

Presentation for the 2006 University Scholars Day at the University of North Texas discussing research on the geography of viral hepatitis C in Texas from 1992-1999.