Plutonium has a long half-life (2.4 x 104 years) and is of concern because of its chemical and radiological toxicity, high-energy alpha radioactive decay. A full understanding of its speciation and interactions with environmental processes is required in order to predict, contain, or remediate contaminated sites. Under aerobic conditions Pu is sparingly soluble, existing primarily in its tetravalent oxidation state. To the extent that pentavalent and hexavalent complexes and small colloidal species form they will increase the solubility and resultant mobility from contamination sources. There is evidence that in both marine environments and brines substantial fractions of the plutonium in solution is present as hexavalent plutonyl, PuO2 2+.

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The overall goal of this project is to develop and test a thermodynamic network model for predicting the effects of substrate additions and environmental perturbations on microbial growth, community composition and system geochemistry. The hypothesis is that a thermodynamic analysis of the energy-yielding growth reactions performed by defined groups of microorganisms can be used to make quantitative and testable predictions of the change in microbial community composition that will occur when a substrate is added to the subsurface or when environmental conditions change.

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Poster from the Turtle Creek Chorale Collection advertising an emergency benefit concert which assisted people in Haiti following a massive earthquake in 2010. Proceeds from the concert would go towards the Clinton Bush Haiti Fund.

Poster for the 2012 University Scholars Day at the University of North Texas. This poster discusses research on how non-native, western speakers acquire languages involving Sino/Japanese characters. Specifically, it addresses how elements from instruction in the native language and culture may be modified to enhance mastery of the given language with regard to character use and literacy.

Poster presentation for the 2012 University Scholars Day at the University of North Texas. This poster discusses a research study that analyzes the way that families cope with the situation when their children come out of the closet as gay, lesbian, or bisexual.

Poster presentation for the 2012 University Scholars Day at the University of North Texas. This poster discusses research on anti-bullying policies in North Texas school districts and their protection of Gay, Lesbian, Bisexual and Transsexual/Transgendered (GLBT) students.

Poster presentation for the 2012 University Scholars Day at the University of North Texas. This poster discusses research on African American women on college campuses. This research consists of studying African American women on college campuses and discerning what psychological components encourage them to have premarital sex.

Poster presentation for the 2012 University Scholars Day at the University of North Texas. This poster discusses research on the biocompatible graphene-based growth of cancer cells. Graphene is made of a single layer of carbon atoms. Recently is has been used to successfully differentiate stem cells in neural cells.

Poster presentation for the 2012 University Scholars Day at the University of North Texas. This poster discusses research on the changing American family and its consequences.

Poster presentation for the 2009 University Scholars Day at the University of North Texas discussing research on chiral porphyrins as selective pharmaceutical receptors.

Poster presentation for the 2012 University Scholars Day at the University of North Texas discussing research on the positive and negative effects of classical conditioning on a person's psyche.

Poster presentation for the 2012 University Scholars Day at the University of North Texas discussing a comparative research study of children and their attitudes towards violence.

Poster presentation for the 2012 University Scholars Day at the University of North Texas discussing research on whether an environmental-themed dance could promote audience awareness of climate change and inspire viewers to live more eco-friendly lifestyles.

Poster presentation for the 2012 University Scholars Day at the University of North Texas discussing research on cultural myths surrounding U.S. female military pilots the the effect of the Soviet Union on their development.

Poster presentation for the 2012 University Scholars Day at the University of North Texas discussing research on the relationship between depression and obesity.

Poster presentation for the 2012 University Scholars Day at the University of North Texas discussing research on collectivist cultures and individualistic cultures.

Poster presentation for the 2012 University Scholars Day at the University of North Texas discussing research on foster care parents and their views of the foster system.

Poster presentation for the 2012 University Scholars Day at the University of North Texas discussing research on open-source software and development teams.

Poster presentation for the 2012 University Scholars Day at the University of North Texas discussing research on skin care among different age groups.

Poster presentation for the 2012 University Scholars Day at the University of North Texas discussing research on attitudes toward honesty in politics.

Poster presentation for the 2012 University Scholars Day at the University of North Texas discussing research on the effect of modern medical technology on the cost of health insurance coverage.

Poster presentation for the 2012 University Scholars Day at the University of North Texas discussing research on the effects of cocaine in the development of maggots and time of death.