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2015

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Examining Male Infertility; The Association Between Age, Environment, And Reproductive Success In Male Patients That Have Participated In Assisted Reproductive Technology, Jeanne Lee Glaser Jan 2015

Examining Male Infertility; The Association Between Age, Environment, And Reproductive Success In Male Patients That Have Participated In Assisted Reproductive Technology, Jeanne Lee Glaser

LSU Doctoral Dissertations

As the number and age of human couples turning to assisted reproductive technology (ART) continues to increase, it is essential for clinicians to understand infertility threats related to both female and male patients. The objective of this study was to evaluate the association between age, environment, and reproductive success in male patients having participated in assisted reproductive technology. In corresponding experiments, male infertility variables such as; age, lifestyle exposures, body mass index (BMI), and infertility length with current partner (ILCP) were investigated. A retrospective collection of clinical male patient data from 2011 to 2014 was evaluated. Thirty-five variables were collected …

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Southeast Asian Youth Chamber Orchestra (Seayco): A Musical Bridge Within The Southeast Asian Region, Paraschos Paraschoudis Jan 2015

Southeast Asian Youth Chamber Orchestra (Seayco): A Musical Bridge Within The Southeast Asian Region, Paraschos Paraschoudis

LSU Doctoral Dissertations

This document is presented from the perspective of the project manager of the Southeast Asian Youth Chamber Orchestra (SEAYCO) and will analyze all the necessary steps from the initial idea to the selecting of the musicians, and through the rehearsal and preparation until its first performance. The College of Music, Mahidol University in Thailand and the Goethe-Institut network of Southeast Asia formed a partnership in order to make this project possible. The sponsor of this unique endeavor was Merck KGaA, a German multinational chemical, pharmaceutical, and life-sciences company that was generous enough to fund part of this project. The main …

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Treatment Efficacy Of Manual Therapy On Speech Outcomes In Children With Spastic Cerebral Palsy: A Single-Subject Experimental Design, Chantelle B. Varnado Jan 2015

Treatment Efficacy Of Manual Therapy On Speech Outcomes In Children With Spastic Cerebral Palsy: A Single-Subject Experimental Design, Chantelle B. Varnado

LSU Doctoral Dissertations

ABSTRACT Objective – The present study aimed to determine if a treatment effect is present on speech outcomes in children with spastic cerebral palsy (CP) given 5 sessions of a manual therapy treatment protocol. Methods – A single-subject experimental design (ABAB) study was devised to establish the treatment efficacy of a manual therapy protocol on speech outcomes in children with spastic CP. The protocol was administered to 5 participants, 4-6 years old. It included five intercostal stretches administered in 15-minute sessions for five sessions. During the withdrawal phase, a sham treatment was administered that included an equal dosage of treatment. …

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Familial Relationships Among Muslim Couples And Parents In The United States: A Qualitative Study, Zahra Aqeel Alghafli Jan 2015

Familial Relationships Among Muslim Couples And Parents In The United States: A Qualitative Study, Zahra Aqeel Alghafli

LSU Doctoral Dissertations

Since September 11, 2001, Islam has been the center of many debates, discussions, parodies, and publications. Many Muslims feel that their religion has been portrayed unfairly in Western media. The topics that seem to generate the most criticism relate to gender roles and the treatment of women, both inside the home and in society. The purpose of this project is to employ a qualitative, in-depth interview approach to examine the perceived role of Islam on marital and familial relationships from insiders’ perspectives and to present participants’ reflections on sensitive issues, including gender roles, women’s rights, the concept of Hijab, religious …

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Toll-Like Receptor 4 (Tlr4) In Acute And Chronic Renal Diseases, Anand R. Nair Jan 2015

Toll-Like Receptor 4 (Tlr4) In Acute And Chronic Renal Diseases, Anand R. Nair

LSU Doctoral Dissertations

Despite advances in its treatment, the incidence of renal diseases has been consistently increasing. Hence, there is a need to understand the underlying molecular mechanisms of the progression of kidney diseases. Recent research implicates inflammation as an important mediator of renal injury. We hypothesized that inhibiting Toll-like receptor 4 (TLR4), an upstream modulator of several inflammatory pathways, would prevent the progression of renal diseases. First, we determined the mechanism by which AngiotensinII (AngII)-induced inflammation is modulated by TLR4 using an in vitro model of rat tubulo-epithelial cells. We blocked TLR4 using gene silencing strategy in NRK52E cells. In TLR4-silenced cells, …

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Clinical Probe Utilizing Surface-Enhanced Raman Scattering (Sers) For In-Situ Molecular Imaging Applications, Jeonghwan Kim Jan 2015

Clinical Probe Utilizing Surface-Enhanced Raman Scattering (Sers) For In-Situ Molecular Imaging Applications, Jeonghwan Kim

LSU Doctoral Dissertations

In this research, a clinical probe utilizing Surface-Enhanced Raman Scattering (SERS) is developed for molecular imaging application which is a visualizing technology to support early diagnosis by providing images in molecular level. In addition to other molecular imaging applications using magnetic resonance, light, and ultrasound, Raman spectroscopy has great potential in terms of non-invasiveness, safety, imaging agent-free, and scanning multiple molecules at a time. However, the critical limitation of Raman spectroscopy using in-vivo molecular imaging application is the inherent low sensitivity of Raman effect. The challenge is overcome by employing SERS enhancing Raman scattering with concentrated electromagnetic oscillation in nanometallic …

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Use Of Copula And Auxiliary Be By African American Children With Gullah/Geechee Heritage, Jessica Richardson Berry Jan 2015

Use Of Copula And Auxiliary Be By African American Children With Gullah/Geechee Heritage, Jessica Richardson Berry

LSU Doctoral Dissertations

The purpose of this study was to document the auxiliary and copula BE system of African American (AA) children with Gullah/Geechee (GG) heritage and to compare the findings to those from African American English (AAE)-speaking children without this heritage and to what has been documented in previous studies of Gullah and AAE. The data came from 38 children, aged five to six years. Nineteen were from rural South Carolina and classified as GG, and 19 were from rural Louisiana and classified as AAE. All were developing language typically, and the groups were matched on a number of socio-demographic variables and …

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Study Of Factors Affecting Growth And Development Of Narrow Brown Leaf Spot Of Rice Caused By Cercospora Janseana (Racib.) O. Const., Kirandeep Kaur Mani Jan 2015

Study Of Factors Affecting Growth And Development Of Narrow Brown Leaf Spot Of Rice Caused By Cercospora Janseana (Racib.) O. Const., Kirandeep Kaur Mani

LSU Doctoral Dissertations

Studies evaluated the effects of planting date, cultivar susceptibility, fungicide application timing, nitrogen management, and tillage practices on the severity of narrow brown leaf spot of rice (NBLS) caused by Cercospora janseana. All factors evaluated affected NBLS severity. The mid-April planted rice had less NBLS as compared to mid-May, late planted rice. Propiconazole fungicide (Tilt) application at panicle initiation or early boot stage was found equally effective in terms of disease reduction in mid-April planting while panicle initiation stage was the best time to apply fungicide in the late planting (mid-May). Early onset and higher severity of NBLS was observed …

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The Effects Of Post-Exercise Consumption Of A Kefir Beverage On Performance And Recovery During Intensive Endurance Training, Keely Virginia O'Brien Jan 2015

The Effects Of Post-Exercise Consumption Of A Kefir Beverage On Performance And Recovery During Intensive Endurance Training, Keely Virginia O'Brien

LSU Doctoral Dissertations

This study was designed to determine whether kefir accentuates the positive health benefits assessed by measures in fitness and/or body composition, as a measure of cardiovascular disease risk as well as the biomarker c-reactive protein. Sixty-seven adult males and females aged 18-35 years were assigned to one of four groups: 1) endurance training + control beverage, 2) endurance training + kefir beverage, 3) active control + control beverage or 4) active control + kefir beverage. The exercise groups completed 15 weeks of structured endurance training while the active control groups maintained their usual exercise routine. Baseline physiological and exercise measurements …

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Obesity In America, Ihsane Boualaoui Jan 2015

Obesity In America, Ihsane Boualaoui

General Submissions: Community and Population-based Materials

The question that imposes itself is that why the previous steps taken by all Americans, whether on the institutional or individual level, were relatively unsuccessful in decreasing the obesity rate or at least keep it steady? If awareness campaigns in health care facilities, public transportation and schools were relatively inefficient in lowering the rate of obesity for the past years, what else could be done to alleviate the acuity of the problem? Is the problem directly related to individuals, health or education institutions, the whole society or a combination of all? As health care professional, patients' advocates and educators, what …

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From With–In The Black Diamond: The Intersections Of Masculinity, Ethnicity, And Identity–An Epistolary Autoethnographic Exploration Into The Lived Experiences Of A Black Male Graduate Student, Vincent Tarrell Harris Jan 2015

From With–In The Black Diamond: The Intersections Of Masculinity, Ethnicity, And Identity–An Epistolary Autoethnographic Exploration Into The Lived Experiences Of A Black Male Graduate Student, Vincent Tarrell Harris

LSU Doctoral Dissertations

From With-In The Black Diamond: (Black Diamond) autoethnographically explores the lived experiences of a Black male who navigates his way through a predominately white higher education institutions while existing within marginalized spaces related to his gender, ethnicity, and identity. Black Diamond uses epistolary writing techniques to explore question research question: 1. How has a Black Gay male graduate student studying Higher Education negotiated his way to and through predominately white higher education institutions? In order to support the answering of this question I will argue that the most influential reasons higher education literature rarely addresses controversial topics related to GLBTQ …

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Communicating Sustainability With Visuals: Issue Perception And Issue Engagement, Zeynep Melis Altinay Jan 2015

Communicating Sustainability With Visuals: Issue Perception And Issue Engagement, Zeynep Melis Altinay

LSU Doctoral Dissertations

Today the list of environmental disasters threatening lives and natural resources has expanded to include many causes. Even though sustainable solutions have never been so urgent, public still issues low priority to many of these serious threats. Many impacts of environmental deprivation, such as coastal land loss, are invisible to the untrained eye, causing individuals to distance themselves psychologically from the risks. The slow pace of environmental degradation constitutes one of the biggest challenges in sustainability communication. The success of sustainable development will require the public to undergo a significant shift in thinking about environmental issues. This dissertation systemically investigates …

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Stimulation Of Escherichia Coli Dna Damage Inducible Dna Helicase Ding By The Single-Stranded Dna Binding Protein Ssb, Zishuo Cheng Jan 2015

Stimulation Of Escherichia Coli Dna Damage Inducible Dna Helicase Ding By The Single-Stranded Dna Binding Protein Ssb, Zishuo Cheng

LSU Doctoral Dissertations

We investigate the regulation of an E.coli iron-sulfur protein DNA damage inducible DNA helicase (DinG) by single-stranded DNA binding protein (SSB). We find that SSB can form a stable protein complex with DinG and stimulate the DinG DNA helicase activity. On the other hand, SSB mutant that retains the single-stranded DNA binding activity but fails to form a protein complex with DinG becomes a potent inhibitor for the DinG DNA helicase. The results indicate SSB stimulates the DinG DNA helicase activity via direct protein-protein interaction. The results from these studies suggest that iron-sulfur proteins are regulated not only by intracellular …

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Deepwater Gulf Of Mexico Oil Spill Scenarios Development And Their Associated Risk Assessment, Muhammad Zulqarnain Jan 2015

Deepwater Gulf Of Mexico Oil Spill Scenarios Development And Their Associated Risk Assessment, Muhammad Zulqarnain

LSU Doctoral Dissertations

World’s growing energy demand has pushed oil companies to explore and produce hydrocarbons in complex and technologically challenging deepwater environments. These difficult and complex operations involve the risk of major accidents as well, demonstrated by disasters such as the explosion and fire on the UK production platform Piper Alpha and capsizing of the Deepwater Horizon rig in the Gulf of Mexico (GoM). Accidents cause death, suffering, pollution of the environment, disruption of business and bad reputation to oil industry. A quantitative risk analysis technique has been used in this study to identify and categorize risk associated with different life phases …

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Examining The Supervisor-Similarity And Work-Family Conflict Relationship: Is Family-Supportive Supervision A Mediator?, Chela M. White-Ramsey Jan 2015

Examining The Supervisor-Similarity And Work-Family Conflict Relationship: Is Family-Supportive Supervision A Mediator?, Chela M. White-Ramsey

LSU Doctoral Dissertations

To say that interest in work-family conflict has increased is an understatement. With the number of dual-earner households increasing, the diversification of the workforce, and women quickly moving into industries that were once primarily male-dominated, the work-family literature is filled with various intonations of the concept. Drawing on insights from social identity and self-categorization theories, this dissertation examined how supervisor-subordinate demographic similarity might relate to the provision of family-supportive supervision and work-family conflict. 102 members of a professional organization dedicated to women who work in technology were surveyed to evaluate whether or not supervisor-subordinate racial and gender similarity would predict …

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Online Multimedia Learning: Predicting Learner Media Selections In The Visual And Verbal Domains, Natalie Toomey Jan 2015

Online Multimedia Learning: Predicting Learner Media Selections In The Visual And Verbal Domains, Natalie Toomey

Electronic Theses and Dissertations

The purpose of this study was to investigate visualizer-verbalizer tendencies through the prediction of learner selection of online, multimedia learning options based on the characteristics of cognitive ability, spatial ability, cognitive style, and learning preference. These characteristics were used to predict the selection of text only, labeled image, and image and narration learning options in two, multimedia learning behavior tests via multinomial logistic regression analysis. Results of this study found that the factor of spatial ability influenced multimedia learning options such that as spatial ability increases, the likelihood of choosing labeled image learning option increases while the likelihood of choosing …

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Bioplastic Production In Cyanobacteria And Consensus Degenerate Pcr Probe Design, Courtney Edward Lane Jan 2015

Bioplastic Production In Cyanobacteria And Consensus Degenerate Pcr Probe Design, Courtney Edward Lane

LSU Doctoral Dissertations

Cyanobacteria show much promise in reducing biodegradable thermoplastic production costs; however, most currently characterized strains are ill-equipped to do so. The result of Objective I produced a high-throughput assay designed to discover existing cyanobacterial strains and rapidly characterize them as PHA-producers or potential PHA-producers. This assay will play an instrumental role in the attainment of a novel cyanobacteria environmental isolate capable of accumulating high levels of PHA naturally. Objective II produced an open source computer program which dramatically speeds the design of similar assays for any arbitrary genetic screening purpose. The program is not limited to this implementation alone. In …

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The Measurement Of Counselors' Emotional Intelligence And Client Treatment Outcomes In Addiction Treatment Settings, Vonzell Wade Jan 2015

The Measurement Of Counselors' Emotional Intelligence And Client Treatment Outcomes In Addiction Treatment Settings, Vonzell Wade

Electronic Theses and Dissertations

Residential adult drug and alcohol treatment centers have yet to investigate the relationship between counselors' emotional intelligence and client success. The purpose of this study was to determine if a relationship exists between the emotional intelligence as well as the personal and professional characteristics of counselors working in residential drug and alcohol treatment centers and client success in treatment. Suggestions for future research include clarifying the relevance of emotional intelligence for a larger sample size, and developing a greater knowledge of risk factors that can contribute towards unsuccessful client treatment stays.

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Thiol-Ene Scaffolds As Synthetic Augments And Silicate Ceramics As Osteogenic Components For Bone Tissue Engineering Applications, Cong Chen Jan 2015

Thiol-Ene Scaffolds As Synthetic Augments And Silicate Ceramics As Osteogenic Components For Bone Tissue Engineering Applications, Cong Chen

LSU Doctoral Dissertations

Bone tissue engineering approaches using polymer/ceramic composites show promise as effective biocompatible, absorbable, and osteoinductive materials. A novel class of in situ polymerizing thiol-acrylate based copolymers synthesized via an amine-catalyzed Michael addition was studied for its potential to be used in bone defect repair. Both pentaerythritol triacrylate-co-trimethylolpropane tris(3-mercaptopropionate) (PETA-co-TMPTMP) and PETA-co-TMPTMP with hydroxyapatite composites were fabricated in solid cast and foamed forms. These materials were characterized chemically and mechanically followed by an in vitro evaluation of the biocompatibility and chemical stability in conjunction with human adipose-derived mesenchymal pluripotent stem cells (hASC). The solid PETA-co-TMPTMP with and without hydroxyapatite (HA) exhibited …

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Regulation Of The Chloride Store In The Retinal Amacrine Cells, Vijai Krishnan Jan 2015

Regulation Of The Chloride Store In The Retinal Amacrine Cells, Vijai Krishnan

LSU Doctoral Dissertations

Nitric Oxide (NO) is a key gaseous messenger that has been shown to be produced by multiple cell types in the vertebrate retina. Research in our lab is aimed at unlocking critical synaptic functions of NO. A major finding from our lab is that NO affects synaptic responses in amacrine cells by altering the plasma membrane gradient for Cl-. This is due to release of Cl- from an internal store and this in turn dependent on a decrease in cytosolic pH. Determining the factors regulating cytosolic Cl- in neurons is fundamental to our understanding of the function of GABAergic and …

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Musicking New Orleans Street Musicians: A Methodology For Writing About Music, Savannah Cadi Rose Ganster Jan 2015

Musicking New Orleans Street Musicians: A Methodology For Writing About Music, Savannah Cadi Rose Ganster

LSU Doctoral Dissertations

This project argues for the use of performative writing as a methodology for writing about musical performances. An analysis of recent scholarship on music and musical performances written by performance studies scholars supports the use of performative writing in texts that address musical performances. In order to further this methodological claim, this study uses performative writing to document both historical and present day accounts of musical performances of street musicians in New Orleans. Utilizing Foucault’s theories on and Roach’s model of genealogy, Bruner’s notion of reflexive ethnography, and Small’s concept of musicking, I theorize, on a meta-methodological level, that performative …

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Articulating Situated Knowledge And Standpoints In Our Responses To Contemporary Street Fiction: A Book Club Case Study With African American Women, Yvette Rachele Hyde Jan 2015

Articulating Situated Knowledge And Standpoints In Our Responses To Contemporary Street Fiction: A Book Club Case Study With African American Women, Yvette Rachele Hyde

LSU Doctoral Dissertations

Contemporary street fiction is a form of literature that has been growing in popularity since the 1990s. Such novels are set in contemporary urban contexts and present the experiences of historically oppressed groups. Sold in venues such as independent bookstores, the Internet, barbershops, beauty salons, flea markets, street vendors, and churches (Hill, Pérez, & Irby, 2008; McClellan, 2011), this genre is especially popular among African American females. Because much of the scholarship concerning engagement with contemporary street fiction focuses on improving school literacy skills, the purpose of this study was to investigate readers’ responses in a book club held at …

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Stress Tolerance Enhancement Of Rice By Genetic Manipulation Of A Bhlh-Myc2 Transcription Factor, Luis Eduardo Sanchez Timm Jan 2015

Stress Tolerance Enhancement Of Rice By Genetic Manipulation Of A Bhlh-Myc2 Transcription Factor, Luis Eduardo Sanchez Timm

LSU Doctoral Dissertations

Rice yield is adversely affected by various abiotic and biotic stresses. Jasmonic acid (JA) signaling has been implicated in stress response of plants. The nuclear localized basic helix loop helix (bHLH) Myc2 transcription factor is known to be a master regulator of genes involved in the response of the JA-mediated signaling pathway during stress and plant development. Myc2 is also induced by wounding and mechanical damage, and is associated with resistance against herbivore insects. In order to understand the mode of action of Myc2 in stress response of rice, overexpresser (OE) and knock-down (KD) mutants for OsMyc2 were generated in …

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The Relationships Of Word Processing In Academic Work And Student Achievement Scores On The National Assessment Of Educational Progress, Amos Glenn Jan 2015

The Relationships Of Word Processing In Academic Work And Student Achievement Scores On The National Assessment Of Educational Progress, Amos Glenn

Electronic Theses and Dissertations

This study is a secondary analysis of the 2011 NAEP writing test investigating the relationships between word processing in academic work and achievement test scores. Using data and methods to overcome several of the limitations found in research surrounding instructional technology, the statistical analyses constructed a table of z- scores and p-values that describe the relationship between both general use and specific uses of word processors and the total score on the NAEP writing assessment. Heuristic analysis of this table finds that there is a persistent and positive relationship between the use of word processors and writing achievement score. Specifically, …

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Evolutionary Relationships Among Fungal Soybean Pathogens And Molecular Marker Development In The Genus Cercospora, Sebastian Albu Jan 2015

Evolutionary Relationships Among Fungal Soybean Pathogens And Molecular Marker Development In The Genus Cercospora, Sebastian Albu

LSU Doctoral Dissertations

Cercospora leaf blight (CLB) and purple seed stain (PSS) are common soybean diseases in the Gulf South of the United States (USA). For nearly a century, Cercospora kikuchii has been considered as the only pathogen causing these diseases. However, previous reports of genetic diversity among isolates collected throughout Louisiana suggested the presence of multiple lineages or species. Recent systematic studies classified species of Cercospora using a taxonomic system based on phylogenetic analysis of five nuclear loci (legacy genes). Using a similar approach, cercosporoid fungi tentatively identified as C. kikuchii were evaluated along with 53 other species of Cercospora. No …

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Mechanisms Controlling Stem Cell Differentiation, Tran Doan Ngoc Tran Jan 2015

Mechanisms Controlling Stem Cell Differentiation, Tran Doan Ngoc Tran

LSU Doctoral Dissertations

Mesenchymal stem cells are multipotent cells that can differentiate into many cell types. However, the molecular mechanism controlling this process remains unclear. We utilized rat dental follicle stem cells (rDFSCs) and human adipose derived stem cells (hASCs) to study the mechanisms controlling osteogenesis and adipogenesis. Elevations in the intracellular Ca2+ concentration are a phenomenon commonly observed during stem cell differentiation but cease after the process is complete. The Transient Receptor Potential Melastatin 4 (TRPM4) is an ion channel that controls Ca2+ signals in excitable and non-excitable cells. However, there are no studies on TRPM4 in stem cells. In another study, …

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Method Development For The Assignment Of Nmr Peaks And The Determination Of Quaternary Protein Structure Using Reductive Methylation, Pamlea Nicole Brady Jan 2015

Method Development For The Assignment Of Nmr Peaks And The Determination Of Quaternary Protein Structure Using Reductive Methylation, Pamlea Nicole Brady

LSU Doctoral Dissertations

The work described herein is centered on reductive methylation, a chemical modification reaction, which allows for the introduction of methyl groups at the primary amines of the lysine side chain and at the N-terminus. The resulting methyl groups are effective probes for the study of protein structure and dynamics using nuclear magnetic resonance spectroscopy (NMR). Described herein is work conducted on the development of tools for the study of protein structure using reductive methylation, highlighting options for addressing limitations of the labeling method encountered by its practical use. Chapter 1 serves as a brief introduction to protein structure and the …

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The Feasibility, Acceptability, And Effectiveness Of A School-Based Motivational Interviewing Intervention For Adolescent Females, Vanessa Durand Jan 2015

The Feasibility, Acceptability, And Effectiveness Of A School-Based Motivational Interviewing Intervention For Adolescent Females, Vanessa Durand

Electronic Theses and Dissertations

Motivational Interviewing (MI) is an evidence-based therapeutic approach shown to elicit behavior change in adolescents engaged in risky behavior. MI is used to increase the individuals feeling of self-efficacy and outcome expectancy. Female adolescents engaged in substance use, sexual activity and identified as academically disengaged were provided an MI intervention in their alternative education setting. According to the Social Cognitive Theory, MI is well suited toward supporting individual behavior change. Results showed that MI is an acceptable intervention to at-risk adolescent females. However, feasibility considerations highlighted the implementation barriers present in this alternative high school as well as those in …

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Expertise And Disbelief: Post-1945 American Attitudes Toward The Authority Of Knowledge, Terry Wagner Jan 2015

Expertise And Disbelief: Post-1945 American Attitudes Toward The Authority Of Knowledge, Terry Wagner

LSU Doctoral Dissertations

“You can’t beat brains,” said President John Kennedy of the intellectuals and technicians he assembled in his cabinet. Kennedy was perhaps the greatest political champion for the virtues of expertise. However, all over America during the 1960s and ‘70s, diverse groups voiced doubts about how much experts, such as social scientists, policy specialists, and others, actually improved life. This dissertation examines how movements on the political left and right, and spiritual ruptures such as the rise of ‘60s counterculture and of evangelicalism, spoke in different language to express a similar point: human mastery over the world is profoundly limited. Many …

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Out-Of-School Sports Time And Children's Body Weight Status: Evidence From A Longitudinal Study, Juan Du, Qi Zhang, Michael Stallone Jan 2015

Out-Of-School Sports Time And Children's Body Weight Status: Evidence From A Longitudinal Study, Juan Du, Qi Zhang, Michael Stallone

Economics Faculty Publications

We used data from the Child Development Supplement (CDS) of the Panel Study of Income Dynamics in 2002 and 2007 to examine the relationship between the specific sport time spent during weekdays or weekends and American children’s body mass index (BMI). Time spent on out-of-school sports was recorded on a randomly selected weekday and a weekend day. Sports were further categorized as formal (organized sports such as sports games or lessons) or casual (any unorganized sports such as sports time in the neighborhood). Child’s height and weight were measured in person by interviewers. Body mass index was used to measure …

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