Digital Commons Network^™

Species Boundaries, Biogeography, And Intra-Archipelago Genetic Variation Within The Emoia Samoensis Species Group In The Vanuatu Archipelago And Oceania, Alison Madeline Hamilton

LSU Doctoral Dissertations

Speciation, geographic variation, and genetic differentiation are fundamental processes that generate diversity, and understanding these processes are major goals of evolutionary biology. Evolutionary phenomena may be more observable on islands as compared to continental landmasses as a result of small population sizes, unoccupied niches, and the relative simplicity of island systems and their populations: physical isolation, shorter (and often well documented) geologic time scale, reduced faunal diversity, and lack of outside faunal influence. Yet, despite their incredible diversity, Pacific island faunas have received little research attention relative to other tropical regions. Using molecular data from several species of scincid lizards …

Participant Positioning And The Positioning Of Participatory Pronouns In The Academic Lecture, Robert Thomas Connor

LSU Doctoral Dissertations

Through a research approach of emergence applied to a corpus of academic letures, I developed a theory to explicate the referents of a class of frequently used pronouns (I, you, and we), which I term the Participatory Pronouns. My theory of the Positioning of Participatory Pronouns resolves the main practical concern of the research participants, which is to place their utterances in contexts for authoritative, intellectually sound, and socially relevant interpretation. At the theoretical level, my theory is a specification of Relevance Theory and resolves disparate previous analyses of pronouns. Overall, my work provides a new paradigm for how referents …

Degradation And Water Quality Dynamics Of Sugarcane Residue In South Louisiana, Jose Roberto Deras

LSU Doctoral Dissertations

PURPOSE: This research was conducted to assess methods to manage the residue blanket to avoid open field burning in sugarcane. Experiments were conducted in the state of Louisiana to evaluate methods to asses and potentially reduce water quality issues. METHODS: Concentrations and frequencies of biological compost tea were sprayed on sugarcane combine-harvester residue blanket to increase degradation rate and reduce potential for runoff water to transport nutrients and sediments that may impair water bodies, while sustaining suitable sugarcane yield. Carbon dioxide evolution rate (mg CO2-C) and CO2 fluxes were measured in laboratory and in open field conditions; as an index …

Syntheses And Evaluation Of Phthalocyanine Derivatives For Applications In Photodynamic And Boron Neutron Capture Therapies For Cancer, Hairong Li

LSU Doctoral Dissertations

Chapter I introduced the background of phthalocyanines including its physical properties and various synthetic methods of free-base and metallo-phthalocyanines. The background of PDT and BNCT was introduced and the objective of ideal sensitizers was described. Chapter II described the synthesis and characterization of a series of pyridiloxy-substituted zinc phthalocyanines with different length of alkyl groups. Pyridiloxy-substituted silica phthalocyanines bearing different associated axial ligands, were alkylated with methyl or PEG chains. Biological study was performed on these cationic pyridiloxy-substituted zinc phthalocyanines. Chapter III introduced the synthesis and photophysical properties of A3B-type zinc phthalocyanines conjugated with one or two cobalta-carborane cages. They …

Development Of New Stimuli-Responsive Vesicles Using A Novel Surfactant, Yuming Yang

LSU Doctoral Dissertations

Many amphiphilic molecules (surfactants) possess the ability to aggregate in aqueous solution to form thermodynamically stable aggregates that have potential for use as molecule containers and delivery systems in analytical or pharmaceutical applications. However, it is difficult to release the encapsulated molecules from these aggregates under a controllable manner, and this problem has dramatically limited the application of these aggregated systems. This study addresses this problem through fundamental structure modification by development of a novel redox stimuli-responsive amphiphile capable of forming vesicle aggregates. Aggregate structure can be adjusted through redox stimulation. The release of agents from the core of the …

A 5000-Year History Of Caribbean Environmental Change And Hurricane Activity Reconstructed From Coastal Lake Sediments Of The West Indies, Jason Thomas Knowles

LSU Doctoral Dissertations

A ~5000 yr history of modern and prehistoric hurricane landfall and environmental change has been reconstructed from coastal lake sediments of the northern West Indies. Hurricane overwash layers and environmental shifts were identified by changes in biological and sedimentary stratigraphies, core lithology, and loss-on-ignition techniques. 14C and 137Cs were used to establish a chronology of events. Many hurricane-induced overwash layers were identified within the lake sediments. Evidence indicates distinct periods of temporal shifts in hurricane activity for the Northern Caribbean islands of Anguilla, Barbuda, and Acklins Island, Bahamas, providing the first paleotempestological records for the region. The northern Caribbean record …

Development And Validation Of The Adolescent Routines Questionnaire: Parent And Self-Report, Kara Meyer

LSU Doctoral Dissertations

The popular parenting literature often has stressed the importance of establishing predictable routines in the lives of young children. In addition, routines as a part of parenting treatment packages have been shown to reduce child behavior problems, as well as disruptive meal and bedtime behavior. Establishing homework routines can lead to increased cooperation and work completion during homework as well as classroom preparedness. Furthermore, empirical literature suggests that the presence of routines is related to overall child health and adherence to medical regimens. Although promising new instruments have been developed to assess daily routines in preschool and school-aged children, none …

The Effects Of Children's Perceptions Of Attachment Security And Emotion Regulation On School Disengagement Among Elementary School Truants, Heeyoung Kim

LSU Doctoral Dissertations

The major focus of this study was to examine how children’s perceptions of attachment security and children’s emotion regulation predict school disengagement among elementary school truants. This study utilized an exploratory, cross-sectional survey design. Data collection was accomplished with four standardized survey instruments, completed by 74 truants (ages 7 to 12 years) and their parents and teachers, and secondary data collected by the East Baton Rouge (EBR) Truancy Assessment and Services Center (TASC), Louisiana during the 2006-2007 academic years. The school disengagement model was tested with three latent variables (children’s perception of emotional bonds, emotion regulation, and school disengagement) using …

Revolutionizing Genomic Analyses: Mutation Analyses Using Novel Enzyme-Based Assays With Laser-Induced Fluorescence And Polymeric Microfluidic Devices As Electrophoretic Platforms, Rondedrick Deshaun Sinville

LSU Doctoral Dissertations

Polymer-based microelectrophoresis was investigated to analyze known (mutation detection) and unknown (mutation scanning) low-abundant mutations in genomic DNA with high diagnostic value for colorectal cancers. For our mutation detection assays, point mutations in the K-ras oncogene were identified using the ligase detection reaction (LDR). For the mutation scanning assay, which searches for sporadic mutations, an EndoV-LDR assay was utilized with mutations in the p53 tumor suppressor gene used as a model. A poly(methylmethacrylate), PMMA, microchip filled with a 4% linear polyacrylamide (LPA) gel was used to electrophoretically sort products formed from LDRs, which produced oligonucleotides <65 bp in length. Using microchip electrophoresis with the LPA, a 44 bp ligation product was resolved from a 100-fold molar excess of unligated primers (25 bp) in approximately 120 s, which was ~17 times faster than conventional capillary gel electrophoresis. In order to simplify the electrophoretic process and further reduce development time, the LDR products were sorted in the absence of the sieving gel using free solution conjugate electrophoresis (FSCE). FSCE incorporated polyamide “drag-tags” onto LDR primers, which provided DNA fragment mobilities in free solution that were dependent upon their size. LDR/drag-tagged (LDR-dt) products could be formed in a multiplexed format for mutant-to-wild-type ratios as low as 1 to 100 with single base resolution. Separations were conducted using capillary array electrophoresis (CAE) and PMMA microchips filled with only a TRIS buffer. Analysis times for the LDR-dt products were less than 11 min using CAE and ~85 s for PMMA microchips with high reproducible migration times within and between microchips. PMMA-based microchips were also evaluated for the identification of sporadic mutations using an endonuclease V – LDR (Endo V/LDR) technique. Endo V cleaves heteroduplexed DNA one base 3’ of single-base mismatched sites as well as nicking DNA at some matched sites as LDR reseals miscleaved sites to reduce false positive signals. Results suggested that Endo V/LDR products from p53 mutations could be successfully separated and detected using a PMMA microfluidic chip filled with a sparsely cross-linked replaceable polyacrylamide gel in less than 6 min, which was approximately 10-fold shorter compared to CAE.

The Impact Of Natural Disasters On Employee Turnover: The Shocks And After-Shocks Of Hurricane Katrina On It Professionals, James Davis

LSU Doctoral Dissertations

Hurricane Katrina was the most destructive natural disaster in American history and created the need for organizations along the Gulf Coast to employ disaster management and recovery plans. With the ubiquitous nature of computers and technology, IT professionals were critical organizational assets in executing those plans in order to insure the safety and recovery of valuable information. The purpose of this study is to gain a deeper understanding of the impact natural disasters have on IT professionals and their subsequent turnover decisions. The theoretical guide for this study was the Unfolding Model of Turnover (Lee and Mitchell 1994) that identifies …

Enriching Or Depleting: An Investigation Of Communication And Behavior Within The Family Business, Joyceia Marie Banner

LSU Doctoral Dissertations

Despite the prevalence of family firms, researchers often ignore the significant impact of the family on the business. Thus, if organizational scholars do not account for the family as a variable in their research, they will not account for a significant number of the organizations they purport to understand. The fact that family businesses comprise such a large percentage of organizations proves that the family business context deserves more attention from both organizational and organizational communication scholars. With this in mind, the original intent of this dissertation was to explore the impact of family relationships on communication practices and behaviors …

Differential Geometry In Cartesian Closed Categories Of Smooth Spaces, Martin Laubinger

LSU Doctoral Dissertations

The main categories of study in this thesis are the categories of diffeological and Fr\"olicher spaces. They form concrete cartesian closed categories. In Chapter 1 we provide relevant background from category theory and differentiation theory in locally convex spaces. In Chapter 2 we define a class of categories whose objects are sets with a structure determined by functions into the set. Fr\"olicher's $M$-spaces, Chen's differentiable spaces and Souriau's diffeological spaces fall into this class of categories. We prove cartesian closedness of the two main categories, and show that they have all limits and colimits. We exhibit an adjunction between the …

Mapping Selective Logging In Mixed Deciduous Forest: A Comparison Of Machine Learning Algorithms, Christopher D. Lippitt, John Rogan, Zhe Li, J. Ronald Eastman, Trevor G. Jones

Geography

This study assesses the performance of five Machine Learning Algorithms (MLAS) in a chronically modified mixed deciduous forest in Massachusetts (USA) in terms of their ability to detect selective timber logging and to cope with deficient reference datasets. Multitemporal Landsat Enhanced Thematic Mapper-plus (ETM+) imagery is used to assess the performance of three Anificial Neural Networks - Multi-Layer Perceptron, ARTMAP, Self-Organizing Map, and two Classification Tree splitting algorithms: gini and entropy rules, MLA performance evaluations are based on susceptibility to reduced training set size, noise, and variations in the training set, as well as the operability/transparency of the classification process. …

Response Of Carbon Fluxes To Water Relations In A Savanna Ecosystem In South Africa, W. L. Kutsch, N. Hanan, B. Scholes, I. Mchugh, W. Kubheka, H. Eckhardt, Christopher A. Williams

Geography

The principal mechanisms that connect carbon fluxes with water relations in savanna ecosystems were studied by using eddy covariance method in a savanna ecosystem at Kruger National Park, South Africa. Since the annual drought and rewetting cycle is a major factor influencing the function of savanna ecosystems, this work focused on the close inter-connection between water relations and carbon fluxes. Data from a nine-month measuring campaign lasting from the early wet season to the late dry season were used.

Total ecosystem respiration showed highest values at the onset of the growing season, a slightly lower plateau during the main part …

An Examination On The Impact Of School Grade Configuration On Eighth Grade Student Academic Achievement In Reading, Writing, And Math, Joyce Lutrey

Master's Theses and Doctoral Dissertations

The purpose of this research effort was to examine the impact of grade configuration on eighth grade student achievement in Math, Reading, and Writing. The quantitative research design used publicly available data and studied the 2000 through 2007 Arizona standards-based, eighth grade student test results across six grade configurations for all Arizona eighth grade students. Additional variables included student gender, ethnicity, socio-economic status, and charter versus public schools.

Chi-square testing showed there were student achievement differences in Math, Reading, and Writing across grade configuration, ethnicity, socio-economic status, and between charters and public schools. These differences were likely due to the …

An Examination Of The Relationship Of Six Risk Factors Associated With Dropping Out Of High School For Students With Disabilities In South Central Michigan, Dawn Gallup

Master's Theses and Doctoral Dissertations

The purpose of this non-experimental, quantitative, retrospective (ex post facto), research in south central Michigan was to determine the relationship of six risk factors associated with dropping out of high school to students with disabilities (SWDs). The six risk factors were (a) grade retention (never held back or held back one or more times), (b) age compared to peers (same age as peers or one year or older than peers), (c) limited English proficiency (English speaking or English as a second language), (d) category of disability (learning disabled/emotionally impaired or cognitively impaired/other), (e) mobility (the number of school districts or …

Perceived Value Of Faculty-Developed Course Websites: A Student-Faculty Comparison, Donald W. Southwell

Master's Theses and Doctoral Dissertations

This study is a case-study examination of faculty-developed course websites and their usage within a single mid-western community college environment. Its purpose is to develop an understanding of the perceived value of selected course websites from both student and faculty perspectives based on website design and use. The study analyzes course websites from instructional and technological theoretical perspectives, drawing from literature in the fields of education and technology studies.

To understand course websites within the context of their usage, three selected course websites were paired with the instructor and a subset of students to form a case study unit. The …

A Survey Of Registered Dietitians' Perceptions Of Constructivist And Behaviorist Instructional Approaches And Delivery Methods In Accredited Dietetics Programs, Martha A. Smith

Master's Theses and Doctoral Dissertations

This purpose of this research study was to test learning theories and models of teaching (constructivist vs. behaviorist) used in dietetic education programs. Additionally, the focus of accreditation for dietetics education is the quality and integrity of a program regardless of its instructional delivery method. Therefore, this study examined the variations between on-line and on-campus delivery methods.

Research questions that guided this study included:

1) To what extent do educators use constructivist or behaviorist theoretical approaches during instructional delivery?

2) What are the differences in learning between on-line education and oncampus delivery methods?

3) As far as constructivist and behaviorist …

The Monroe County Intermediate School District: A Case Study, Donald A. Spencer

Master's Theses and Doctoral Dissertations

Background: Throughout the history of public education in Michigan, there has been an intermediate unit of educational government. This unit of educational government exists between the State Department of Education and the local school districts. Currently, there are fifty-seven intermediate school districts in Michigan providing educational services and governance functions.

Purpose: The purpose of this study was to understand the Monroe County Intermediate School District in order to inform educational leadership.

Research Design: This study was an interpretive, historical case study. The study explored the manner in which culture was perpetuated via the system of education in Monroe, Michigan, throughout …

Studying Scratching/Buffing Mechanism Of The Clearcoats And Improving The Technique And Devices/Materials In Automobile Refinish Work, Chakravarthi Mallikarjun Nagolu

Master's Theses and Doctoral Dissertations

As automotive coating technology advances, the manufacturers have developed new generations of after-market coatings as well as OEM (Original Equipment Manufacturing) coatings. The new coatings possess much stronger mar/scratch resistance either with raised elastic modulus and hardness or with the ability of self-healing. These pose new challenges to the auto-body refinish work. In the refinishing process, the after-market coatings are applied to the bodies (surfaces), and then the imperfections, which are inevitable during the application process due to the environmental dust in the shops, will be buffed out to make a smooth and shining surface. The new coatings are very …

An Evaluation Of States’ Delivery Of Substance Abuse Treatment, Catherine Anne Collins

Master's Theses and Doctoral Dissertations

As the economic, political, and technological landscape of America’s healthcare management system changes, states are forced to grapple with the progressively arduous task of administering substance abuse treatment programs. Using the Open Systems Model, this research examines external and internal environmental factors that influence goal displacement as it is hypothesized to occur in states’ treatment delivery systems. The findings suggest that a mix of environmental characteristics affect states’ levels of goal displacement but the factors that predict displacement in alcohol treatment are different than for the delivery of drug treatment. The internal and external environment factors that contribute to goal …

Design And Synthesis Of Small-Molecule Inhibitors As Anti-Malarial And Anti-Serpin Agents, Maria Mirela Puscau

Master's Theses and Doctoral Dissertations

This work describe the design, synthesis and evaluation of small-molecule inhibitors of two different biological targets: Plasmodium falciparium, the most virulent malarial parasite in humans, and plasminogen activator inhibitor-1 (PAI-1), an endogenous serine proteases inhibitor implicated in a wide range of biological processes. Malaria is one of the top global health threats, and there is a great need for developing effective new chemotherapies. PAI-1 is a major component in the regulation of the plasminogen activation system, and the overexpression of this protein has been implicated in a number of conditions, such as thrombosis, atherosclerosis, and myocardial infarction. The research …

Using Elliptical Fourier Analysis To Compare Size Of Morphospace Occupation Between Modern Edentulous Freshwater Unionoid Mussels And The Fossils At L6516 (Slope County, North Dakota, Usa), With Remarks On Preservation, Mathew E. Burton-Kelly

Theses and Dissertations

The purpose of this project was to use outline morphometric techniques to determine the number of freshwater mussel taxa present at locality L6516 (“Das Goods”),which is located in Cretaceous strata in the basal Ludlow Member of the Fort Union Formation in Slope County, North Dakota, U.S.A. Secondary goals were to improve the outline morphometric procedures that have been previously used to characterize fossil and extant freshwater mussels, and to describe in more detail the preservation of the edentulous unionoid specimens from the Das Goods area.

Outlines of individual mussel valves were used for morphometric analyses due to lack of preserved …

Muir Studies Of Nonlinear Ionospheric Interactions At Haarp, Margaret Eileen Bacon

Master's Theses and Doctoral Dissertations

Studies of nonlinear ionospheric interactions were undertaken at the High Frequency Active Auroral Research Program (HAARP) site in Alaska using the co-located Modular UHF Incoherent scatter Radar (MUIR). High frequency heating of the ionosphere produced plasma wave decay processes, the signatures of which were received by MUIR and interpreted with spectral analysis in MATLAB. The most commonly observed decay scheme was that of the Parametric Decay Instability, producing the distinct multifrequency cascade feature in the HF backscatter. The results presented here are intended to contribute to the understanding of HF heating facility capabilities, plasma wave decay processes, and diagnostic instrument …

The Effect Of One-Session Exposure Treatment On Selective Processing And Explicit Memory Bias In Snake- And Spider-Fearful Participants, Karen L. Stanley-Kime

Master's Theses and Doctoral Dissertations

Unlike the empirically supported phenomenon of anxiety-induced selective processing bias, research on congruent explicit memory bias is inconclusive; indeed, there is evidence for recall decrements of threat-relevant information. There is also a paucity of literature examining the effects of treatment on these cognitive biases. Thus, the purpose of this study was to examine the effect of exposure treatment on selective processing and explicit memory bias in snake- and spider-fearful participants by measuring implicit and explicit memory for central and peripheral environmental details. Recall for environmental details in a fearful group that received treatment was compared to a fearful group that …

The Effects Of Multiple Head Micro-Trauma On Cognitive Function In High School Football And Soccer Athletes, Jessica M. Cole

Master's Theses and Doctoral Dissertations

There are limited studies that deal with the acute and chronic effects that high collision sports have on neurocognitive function. This study used a standardized concussion assessment (SAC) test to examine the effects that participation in high school football and high school soccer has on athletes’ neurocognitive functions throughout a season.

Forty-six male high school athletes participated in this study: 30 football players, and 16 soccer players. Each athlete underwent baseline SAC testing and a variety of SAC tests three additional times throughout the duration of the season, approximately 3 weeks apart.

Data analyses of the SAC scores did not …

Assessment Of Practitioner Intervention In Physical Activity, Kristin Thea Schley

Master's Theses and Doctoral Dissertations

Lack of physical activity is a serious epidemic that affects one’s health. Primary care physicians can play a key role in influencing and changing people’s behaviors. The objective of this study was to assess primary care physicians’ role in physical activity counseling and what if any guidelines they use. One hundred and forty-seven primary care physicians completed and returned the 23-item Physical Activity Counseling Questionnaire. Most of the respondents were over the age of 50 (58.5%), group practitioners (60.5%), male (59.9%), and have been practicing more than 20 years (50.3%). The majority of physicians “almost always” (47.6%) counseled their patients …

Osteoporosis Education In College-Age Women, Elizabeth Byrne Rodzik

Master's Theses and Doctoral Dissertations

Osteoporosis, a degenerative bone disease, is a preventable disease. The purpose of this study was to determine if an educational intervention would increase knowledge and influence women to change their behaviors (i.e., exercise and dietary calcium intake) related to osteoporosis.

A random sample of 149 college female students participated in this study. Participants completed two questionnaires consisting of the Osteoporosis Knowledge Test and the Osteoporosis Self-Efficacy Scale. Participants were surveyed to determine their knowledge of osteoporosis and their intent to change their health behavior before and after an educational intervention.

Statistical analysis indicated that an educational intervention increased the subjects’ …

Post-September 11Th Representations Of Latin American Immigrants In Political Discourse: An Analysis Of Metaphor, Nick James Romerhausen

Master's Theses and Doctoral Dissertations

This study analyzes the types of metaphorical labels that the United States House of Representatives uses in post-September 11th resolutions to label and describe Latin American immigrants. The rhetorical philosophy of Kenneth Burke, Haig Bosmajian’s The Language of Oppression, and a study conducted in 1999 by Otto Santa Ana provide the framework for analyzing the power of the dominant and secondary metaphors found in these documents. Furthermore, this paper examines the connection between metaphorical labels and social and political attitudes toward Latin American immigration in contemporary discourse.

The Meaning Of Natural Environment Occupations: Exploring The Experiences Of Sierra Club Members, Tulin Roselynn Ture

Master's Theses and Doctoral Dissertations

Poets and writers have long lauded the beauty and necessity of nature. More recent literature and research has provided support for the healthful benefits of the natural environment. This literature spans the breadth of many disciplines. Yet, very little occupational therapy literature focuses on the natural environment. This is somewhat surprising given occupational therapy’s focus on space and place.

This thesis explores the experience of participation in natural environment occupations by adult members of the Sierra Club. Five Sierra Club members were interviewed and two local Sierra Club outings were observed. Qualitative data analysis revealed two major themes: childhood beginnings …