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Computer Simulation Of Ion-Induced Nucleation In The Presence Of Single Ions And Ion Pairs, Samuel Keasler

LSU Doctoral Dissertations

Atmospheric aerosol particles play an important role in climate and human health. Despite their importance, the mechanisms of their formation are still poorly understood. Ion-induced nucleation may play a role in the process, but details are lacking about how the nucleation rate depends on the size, charge, and number of ions in the cluster. In order to better understand the role that ions might play in new particle formation, we have performed a series of AVUS-HR simulations of the water nucleation in the presence of both single ions and ion pairs. These simulations have shown that the location of the …

Highly Efficient Selection, Enumeration, Enrichment, And Molecular Profiling Of Low-Abundance Biological Cells, Udara R. Dharmasiri Rasika Dharmasiri

LSU Doctoral Dissertations

After brief overviews of low-abundance cell selection techniques in chapter 1 and circulating tumor cells in chapter 2, this dissertation initially focuses on the development of aptamer incorporated high-throughput microfluidic techniques to select rare circulation prostate cancer cells (LNCaP) directly from whole blood with subsequent quantification of these rare cells using a non-labeling approach. Then, I extended the technology to environmental samples in an effort around time, sensitivity, and portability of traditional groundwater assessment. As a model bio- pathogen, E. coli O157:H7 was chosen due to its toxicity and its adverse impact on recreational waters. Low-abundance (<100 cells mL-1) E. coli O157:H7 cells were isolated and enriched from environmental water samples using a microfluidic chip that its capture beds were covalently decorated with E.coli O157:H7 specific polyclonal antibodies. The selected cells were enumerated using RT-qPCR technique. Finally, I have integrated HTMSU with electrokinetic enrichment microfluidic unit for performance of single recombinant low-abundance CTC cell-based assay. A series of analytical processes were carried out, including immunoaffinity selection of rare CTCs, quantification of selected cells via conductivity impedance and electrophoretic enrichment of selected cells for PCR/LDR/CE interrogation for detection of low-abundance point mutations in genomic DNA.

The Effect Of Anisotropic Surface Energy On The Stability Of Micro And Nano Wires, Ping Du

LSU Doctoral Dissertations

A liquid thread of radius R will break up into drops if the axial wavelength of the surface perturbation L > 2πR. If L < 2πR, the thread is stable and will remain intact. This is Rayleigh’s stability criterion based on a continuum model. We use molecular dynamics to simulate the evolution of Lennard-Jones liquid threads with equilibrium radius R = 2.3-6.6, where R has been non-dimensionalized by the distance at which the Lennard-Jones potential equals zero. We find that if R is fixed, the wavelength L is bounded by L_min and L_max. For L > L_max the thread always breaks up and stays as drops, and for L < L_min the thread remains intact. However, for L_min < L < L_max, the thread oscillates continuously among several shapes. The appearance of various shapes can be explained by the energy fluctuation of the system.

We also simulate the evolution of Lennard-Jones nanowires with equilibrium radius R = 1.57, 2.58, 3.59, and 4.60 by molecular dynamics. The wires …

Revitalizing The Suburban Dream: Disaster, Displacement And Resilience In Eastern Orleans Parish, Meredith Morgan Feike

LSU Doctoral Dissertations

Hurricane Katrina tested the disaster resiliency of communities throughout the city of New Orleans. More than four years after breaches in levees led to the flooding of one hundred forty square miles of the Crescent City, some residents are still struggling to reclaim their neighborhoods one block at a time. Eastern Orleans Parish is a portion of the local landscape whose long-term sustainability remains uncertain. Rebuilding is extremely slow with only a fraction of residents returning to the area. Development in New Orleans East began after World War II as a result of urban sprawl. Many New Orleanians desired a …

Reliability And Validity Study Of The Motiviation For Fear (Motif) Survey, Marie S. Nebel-Schwalm

LSU Doctoral Dissertations

The aim of this study was to determine psychometric properties of a newly created, 24-item functional measure of fear and anxiety for typically-developing adults (the Motivation for Fear; MOTIF). Participants initially included 1,277 college students ranging in age from 18-35. Participants were asked to complete the MOTIF, the Questions About Behavioral Function (QABF), the Sensation Seeking Scale- Form V, and the Depression Anxiety Stress Scales (DASS). Analyses were conducted on those scoring above a minimum threshold on a well-normed measure of anxiety (the DASS). An exploratory factory analysis, using scree plot and parallel analysis, as well as oblique rotation was …

Study Of Host-Fungus Interactions Between Soybean And Phakopsora Pachyrhizi Using Proteomics, Sunjung Park

LSU Doctoral Dissertations

Asian soybean rust, caused by Phakopsora pachyrhizi, is an emerging disease in the continental U. S. and resistant commercial varieties have not been reported. In an effort to understand the interactions during rust infection of soybean, protein profile changes were examined over a 14-day period in soybean leaves of one susceptible commercial line (Pioneer 93M60) with or without soybean rust inoculation using proteomics in this study. Forty protein spots differentially expressed after rust inoculation were identified and fourteen of them were recovered and sequenced. These included proteins involved in plant defense, stress, metabolism, and other biological processes. During the time-course …

Edaphic And Vegetative Controls On Mercury Cycling In Oligohaline Wetlands, Jonathan M. Willis

LSU Doctoral Dissertations

With the expansion of the human population and associated industries there is a concomitant increase in both resource utilization and the production of waste and deleterious by-products. Mercury is a naturally-occurring toxic metal with a complicated and unique biogeochemical cycle, and is often a contaminant of ecotoxicological concern in unindustrialized aquatic habitats. The research described herein was designed to elucidate multiple aspects regarding the behavior of mercury in oligohaline wetland habitats, particularly with respect to edaphic and vegetative effects, through a monitoring and characterization study as well as a series of manipulative experiments. The observational study, conducted in the wetlands …

Effects Of Habitat Structural Complexity On Nekton Assemblages: Lab And Field Observations In Southern Louisiana, Austin T. Humphries

LSU Master's Theses

Greater structural complexity is often associated with more diverse and abundant species assemblages. Biogenic reefs formed by the eastern oyster (Crassostrea virginica) are structurally complex in nature and have been recognized for their potential habitat value in estuarine systems along the Atlantic and Gulf of Mexico coasts. To determine how the structural complexity of newly created oyster reefs may influence the abundance and distribution of species, three objectives were established. First, to examine spatial and temporal patterns of nekton use at newly created oyster reefs, as well as the impact of wave exposure, six paired oyster reef and mud-bottom treatments …

Pharmaceutical Compounds In Treatment Wetlands: Potential Removal And Effects On Microbial Processes, Jeremy Landon Conkle

LSU Doctoral Dissertations

active compounds (PhACs) have been detected in the aquatic environment as a result of loading from various sources. In Louisiana, USA, many municipalities treat wastewater using natural systems, such as lagoons and wetlands, rather than using conventional wastewater treatment technologies and may discharge PhACs into the environment. These treatment systems are not designed to remove PhACs from wastewater, nor is it currently a regulatory requirement. Research on the fate of PhACs in the environment is needed to understand impacts on Louisiana’s important coastal system. Wastewater sampling for PhACs at the Mandeville, LA wastewater treatment plant (WWTP) determined that this system …

Influences On Public Support For Green Infrastructure: An Examination Of Urban Wetland Restoration In Post-Katrina New Orleans, Lynette C. Overholser

LSU Master's Theses

The research examines patterns of likely support for urban wetland restoration in the Greater New Orleans area. Through multi-variate statistical analysis of responses derived from an original survey of homeowners in New Orleans, key factors are identified that explain variation in residents’ willingness to accept such areas and their perceptions of ecological benefits associated with a theoretical wetlands restoration design for the Gentilly area. Further, the analysis determines the extent to which direct experience with Hurricane Katrina may influence public support for this and other green infrastructure projects. The results of the data collected show that many people in New …

A Study Of The Interactions Of Lipid Bilayers And Dendrimers Using Small Angle X-Ray Scattering And Freeze Fracture Transmission Electron Microscopy, Derek R. Dorman

LSU Doctoral Dissertations

Lipids are fundamental to all life forms, a key component of cell walls, and essential to proper respiratory function. They are amphiphilic molecules and readily form bilayers. Dendrimers are designer molecules that can be tailored to provide a variety of endgroup moieties, sizes, and charges. The interaction of liposomes and dendrimers can provide information on how medicine interacts with cells and an array of unique structures can be imagined from their assembly into superstructures. Polypropylenimine tetraamine (DAB-Am) and 1-directional arborol dendrimers have been studied in different molar concentrations with 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) bilayers. One-directional arborols are amphiphilic dendrimers with a hydrophilic …

Comparative Studies Of Innate Host Defense Mechanisms Against Virulent And Avirulent Species Of Microsporidia, Amber Lynn Mathews

LSU Master's Theses

Microsporidia are ubiquitous, obligate intracellular eukaryotes that cause chronic diarrhea and disseminated diseases in humans, especially in immunocompromised individuals. Macrophages, cellular components of the innate immune system, are believed to be the source of dissemination of this pathogen throughout the body. Little is known about the innate immune response to microsporidia. Macrophages are a source of interleukin (IL)-12 and IL-23 and play an essential role in the link between innate and adaptive immunity. The focus of this thesis is the investigation of the p38 mitogen-activated protein kinase (MAPK) signaling mechanisms and IL-12 and IL-23 production regulated by Toll-like receptor (TLR) …

Landscape Patterns Of Community Structure, Biomass And Net Primary Productivity Of Mangrove Forests In The Florida Coastal Everglades As A Function Of Resource, Regulators, Hydroperiod, And Hurricane Distrubance, Edward Castaneda

LSU Doctoral Dissertations

Spatial and temporal patterns of mangrove vegetation in the Florida Coastal Everglades (FCE) reflect a major interplay of resources, regulators and hydroperiod gradients. I investigated landscape patterns of community structure, biomass and NPP of mangroves along two FCE estuaries: Shark River and Taylor River. I also evaluated whether pulsing events such as Hurricane Wilma are significant to soil nutrient inventories and vertical accretion of mangroves in FCE. There was a higher forest structural complexity of mangroves in Shark River relative to Taylor River. The biomass root:shoot ratio was 17 times higher in Taylor River relative to Shark River, indicating that …

Retention And Transport Of Mercury And Nickel In Soils, Lixia Liao

LSU Doctoral Dissertations

Nickel (Ni) is one of many trace metals widely distributed in the environment. High concentrations of Ni in soils and aquifers have been observed worldwide, causing several potential human health impacts. Better understanding of Ni transport in soils and aquifers is necessary to assess and remediate insitu environmental contamination. The movement of Ni in soils and aquifers is highly dependent on adsorption-desorption reactions in the solid phase. In this study, kinetic batch, sequential extractions, and miscible displacement experiments were conducted to investigate the effect of several of environmental factors including soil type, reaction time and competing ions, on the fate …

5th International Galliformes Symposium (November 7-10, 2010 : Chiang Mai, Thailand): Abstract Book, Tommaso Savini, Simon D. Dowell

Galliformes Specialist Group and Affiliated Societies: Conference Proceedings

Conserving Galliformes: What we need to do, Philip J. K. McGowan

The Galliformes Specialist Group, Peter J. Garson and Ilse Storch

Session 1: Conservation in Thailand, Chair: Tommaso Savini

Wildlife conservation status in Thailand: The elephant's case study, Mattana Srikrajang

The Galliformes studies and research problems in Thailand, Wina Meckvichai

Session 2: Galliformes Research and Conservation in Thailand, Chair: Wina Meckvichai

Ranging ecology of Siamese fireback (Lophura diardi) in submontane forest, Niti Sukumal, George A. Gale, and Tommaso Savini

Nesting behaviour and nest site selection of scaly-breasted partridge in Mo Singto Research Plot, Thailand, Tiwa Ong-in, George Gale, …

The Acute Time Course Of Concurrent Activation Potentiation, Luke Garceau, Erich Petushek, Mckenzie Fauth, William Ebben

Exercise Science Faculty Research and Publications

This study evaluated the acute time course of the ergogenic effect of concurrent activation potentiation (CAP). Forty-two men and women, including CAP non-responders and responders, performed a 5 second isometric knee extension on a dynamometer with the use of remote voluntary contractions (RVC). Mean torque was assessed in seven 500 millisecond (ms) time periods. A two-way repeated measures ANOVA revealed significant main effects for time period (p ≤ 0.001), but no significant interaction between time period and CAP non-responders and responders (p > 0.05). The ergogenic effects of CAP are accrued during the first 1000ms. Concurrent activation potentiation responders produce greater …

A State Of Rightlessness: The Egregious Case Of North Korea, Morse Tan

Faculty Articles, Papers, and Other Scholarship

This essay steps into the relative dearth of popular and legal academic treatment to analyze this egregious state of rightlessness (an intentional neologism) and concludes with reflections upon possible judicial redress options. Experts in the human rights field have averred that the human rights situation in North Korea is the worst in the world. The North Korean government denies any human rights abuses, insisting “that 'there is no human rigths [sic] problem in North Korea.'" This academic work challenges this outright denial by providing an analysis of various human rights abuses persisting north of the most heavily armed border in …

The Sexual Economy Of The Islamic Republic: Birth Control, Female Sexual Awakening, And The Gay Lifestyle, Janet Afary

Khazar Journal of Humanities and Social Sciences

No abstract provided.

For Those Not John Edwards: More And Better Paternity Acknowledgments At Birth, Jeffrey A. Parness, Zachary Townsend

Faculty Articles, Papers, and Other Scholarship

When former U.S. Senator and Presidential candidate John Edwards (finally) declared his paternity of Quinn, born of sex to Rielle Hunter, many assumed he could then begin to raise as well as financially support the child he once publicly shunned. Many assumed legal paternity could arise through a court order, if not Rielle’s wishes. Had he been on the Maury Povich television show, the positive genetic tests would have prompted the host to declare John the father. Yet notwithstanding these declarations, there would be no childrearing by John if Rielle determined he should have no contact with Quinn, even if …

Judgments Of Information Structure In L2 French: Nativelike Performance And The Critical Period Hypothesis, Robert V. Reichle

Faculty Articles, Papers, and Other Scholarship

Previous studies using judgments of morphosyntactic errors have shown mixed evidence for a critical period for L2 acquisition (e.g., Birdsong & Molis 2001, Johnson & Newport 1989). This study uses anomalies in the domain of information structure, the interface between syntactic form and pragmatic function, to shed light on the effect of age of arrival on L2 performance. In two experiments, high-proficiency L2 speakers of French were presented with sentence pairs containing either expected or anomalous information structure. Subjects judged each exchange as acceptable or unacceptable. A weak postmaturational effect of age on acceptability task performance was observed, along with …

The Role Of Methyl Cpg Binding Domain Protein 2 (Mbd2) In The Regulation Of Embryonic And Fetal Β-Type Globin Genes, Merlin Nithya Gnanapragasam

Theses and Dissertations

The reexpression of the fetal γ-globin gene in adult erythrocytes is of therapeutic interest due to its ameliorating effects in β-hemoglobinopathies. We recently showed that Methyl CpG Binding Domain Protein2 (MBD2) contributes to the silencing of the chicken embryonic ρ-globin and human fetal γ-globin genes. We further biochemically characterized an erythroid MeCP1 complex that is recruited by MBD2 to mediate the silencing of these genes. These observations suggest that the disruption of the MeCP1 complex could augment the expression of the fetal/embryonic globin genes. In the studies presented in chapter 2, we have pursued a structural and biophysical analysis of …

Tort Damages And The New Science Of Happiness, Rick Swedloff, Peter H. Huang

Publications

The happiness revolution is coming to legal scholarship. Based on empirical data about the how and why of positive emotions, legal scholars are beginning to suggest reforms to legal institutions. In this article we aim to redirect and slow down this revolution.

One of their first targets of these legal hedonists is the jury system for tort damages. In several recent articles, scholars have concluded that early findings about hedonic adaptation and affective forecasting undermine tort awards for pain and suffering, mental anguish, loss of enjoyment of life, and other non-economic damages. In the shadow of a broader debate about …

Energy Justice And Sustainable Development, Lakshman Guruswamy

Publications

Sustainable Development ("SD")--an expression of distributive justice--is the foundational premise of international energy and environmental law. It posits that international answers to environmental and energy problems cannot be pursued as independent and autonomous objectives but must be addressed within the framework of economic and social development. SD has been politically institutionalized in the Millennium Development Goals and a plethora of significant international instruments. Perhaps more importantly from a legal standpoint, SD is unequivocally codified, in the most widely accepted international energy and environmental treaties. This Article affirms the importance and continuing applicability of SD to the "other" third of the …

Judicial Erasure Of Mixed-Race Discrimination, Nancy Leong

Faculty Publications

No abstract provided.

A Necessity For Sex Difference Researchers: A Review Of David C. Geary, Male, Female: The Evolution Of Human Differences (2nd Ed.). American Psychological Association: Washington, D.C., 2009, Isbn 9781433806827, Norman P. Li, Oliver Sng

Research Collection School of Social Sciences

Male, Female: The Evolution of Human Differences (2nd ed.), written by University of Missouri Curators' Professor and Thomas Jefferson Professor David C. Geary, is the long-awaited update to a classic treatise on sex differences originally published in 1998. The new edition has been largely expanded (by 171 pages) and summarizes much of the research relating to sex differences that has surfaced in the last 12 years. The book begins with a review of the broad processes of natural and sexual selection (Chapters 1–4) and then covers sexual selection in primates before moving on to humans (Chapter 5). The book then …

Intrasexual Competition And Eating Restriction In Heterosexual And Homosexual Individuals, Norman P. Li, April R. Smith, Vladas Griskevicius, Margaret J. Cason, Angela Bryan

Research Collection School of Social Sciences

Restrictive eating attitudes and behaviors have been hypothesized to be related to processes of intrasexual competition. According to this perspective, within-sex competition for status serves the adaptive purpose of attracting mates. As such, status competition salience may lead to concerns of mating desirability. For heterosexual women and gay men, such concerns revolve around appearing youthful and, thus, thinner. Following this logic, we examined how exposure to high-status and competitive (but not thin or highly attractive) same-sex individuals would influence body image and eating attitudes in heterosexual and in gay/lesbian individuals. Results indicated that for heterosexuals, intrasexual competition cues led to …

Xenophobia: The Consequences Of Being A Zimbabwean In South Africa, Philip Edward Culbertson

Theses and Dissertations

This paper seeks to explain and describe the xenophobia and xenophobic attacks of Zimbabwean refugees and migrants in South Africa. The political and social instability in Zimbabwe has led to mass exodus of Zimbabweans in search of stability and a means to survive. Many of these Zimbabweans have sought opportunity and refuge in South Africa only to be met with hurdles that metastasized into xenophobia. Research was done on the target population of Zimbabweans in Central Methodist Church in Johannesburg, along with interviews conducted through Medicines Sans Frontiers, and active players in the civil society in Cape Town.

Correct Diagnosis; Wrong Cure: A Response To Professor Suk, Joan C. Williams

Faculty Scholarship

No abstract provided.

Interparental Conflict In Context: Exploring Relations Between Parenting Processes And Children's Conflict Appraisals., Renee Lynn Deboard-Lucas, Gregory M Fosco, Sarah R. Raynor, John H. Grych

Psychology Faculty Research and Publications

Children's appraisals of conflict are a mechanism by which parental discord can lead to child maladjustment. The cognitive-contextual framework proposes that parent-child relationships may affect how children perceive conflict, but this idea has rarely been examined empirically. This study investigated relations between conflict appraisals, parenting, and child adjustment in a sample of 150 8- to 12-year-old children, using a multi-informant, multimethod design. Mothers' coercive/controlling and emotionally unsupportive parenting magnified the relation between conflict and children's self-blame; emotionally supportive parenting diminished this association. Children's secure attachment with fathers was linked with less threat and self-blame; more security reduced self-blame for conflict. …

The Sagebrush Steppe Treatment Evaluation Project (Sagestep): A Test Of State-And Transition Theory., J. D. Mciver, Mark W. Brunson, S. Buntin, J. Chambers, N. Devoe, P. Doescher, J. Grace, D. Johnson, S. Knick, R. Miller

Environment and Society Faculty Publications

No abstract provided.