Digital Commons Network^™

Plant Community Responses To An Extended Fire-Free Interval Following Frequent Fires In Two Wet Pine Savannas In Southern Mississippi, Sarah E. Hinman

Electronic Theses and Dissertations

No abstract provided.

Ethanol Toxicity In Japanese Medaka Embryogenesis : A Mechanistic Study / By Xueqing Wang, Xueqing Wang

Electronic Theses and Dissertations

No abstract provided.

Microbial Modification Of Corn Stover To Increase Ethanol Yield, Naresh K. Budhavaram

Electronic Theses and Dissertations

No abstract provided.

The Scientific Shortcomings Of Roper V. Simmons, Deborah W. Denno

Faculty Scholarship

This Article contends that some of the case law and social science research that form the basis for the United States Supreme Court's decision in Roper v. Simmons are insufficient and outdated. The Court also relies heavily upon briefs submitted by the respondent and his amici, in lieu of providing more pertinent citations and analysis that could have enhanced and modernized the Court's arguments. The sparse and sometimes archaic sources for Roper potentially limit the opinion's precedential value. For example, the Court cites Erik Erikson's 1968 book, Identity: Youth and Crisis, to support the view that, relative to adults, juveniles …

Addressing Diversity: A Case Study Of Teacher Educators' Views And Instructional Practices At A Midwestern University, Alina Slapac

Dissertations and Theses @ UNI

It is well documented that while the student population is becoming more and more diverse, the teacher population remains mostly white, female, monolingual, and monocultural (Banks, 2001a; Darling-Hammond, 2002; Nieto, 2000a). Consequently, teacher education programs have the important role of addressing diversity throughout curriculum, field experiences and faculty recruitment.

The purpose of this qualitative research was to gain more understanding, from the teacher educators' perspectives, about the way diversity is being addressed at a Midwestern university by examining teacher educators' various methods of instruction, and their course materials, which focus on diversity issues and the needs of diverse learners. The …

United States American Students' Experience With And Orientation Toward International Diversity In A Midwestern Comprehensive University Setting, Olga V. Kostareva

Dissertations and Theses @ UNI

The growing phenomenon of globalization has directly affected all levels of postsecondary institutions as evidenced by the strong emphasis colleges and universities place on internationalizing their campuses. Among the forthstanding efforts toward campus internationalization is attracting international students to American colleges and universities. Numbers of international students enrolled in U.S. colleges and universities have indeed been very high, placing this country in the leading position for hosting students from abroad. Hhowever, the role international students play in the overall process of internationalization has rarely been addressed. While the presence of international students is believed to contribute significantly to the intellectual …

Cohort Study Of Nitrate Exposure From Drinking Water, Mhg Level, And Implications On Possible Recovery Oxygen Uptake By Age-Grade, Patricia Teran Yengle

Dissertations and Theses @ UNI

No abstract provided.

Establishment Of Polarity During Organization Of The Acentrosomal Plant Cortical Microtubule Array, Ram Dixit, Eric Chang, Richard Cyr

Biology Faculty Research

The plant cortical microtubule array is a unique acentrosomal array that is essential for plant morphogenesis. To understand how this array is organized, we exploited the microtubule (+)-end tracking activity of two Arabidopsis EB1 proteins in combination with FRAP (fluorescence recovery after photobleaching) experiments of GFP-tubulin to examine the relationship between cortical microtubule array organization and polarity. Significantly, our observations show that the majority of cortical microtubules in ordered arrays, within a particular cell, face the same direction in both Arabidopsis plants and cultured tobacco cells. We determined that this polar microtubule coalignment is at least partially due to a …

Vitrification And Dehydration For The Preservation Of Gametes, Allison E. Moisan

LSU Doctoral Dissertations

Of the 36 species of felines in the world, all except the domestic cat are listed as endangered or threatened. To preserve the genetic diversity of felines and other species, genome resource banks have been established. Due to limited availability of germ cells for research, studies must use models to optimize the techniques before they are applied to endangered species. In this study, preservation of oocytes and spermatozoa was examined using the bovine as a model for felines. In the first series of experiments, bovine and feline oocytes were dehydrated, vitrified, warmed and cultured to assess their ability to undergo …

Multianalyte Detection Of Breast Cancer By Fabrication Of Hybridmicroarrays On Polymer-Based Microanalytical Devices, Suying Wei

LSU Doctoral Dissertations

Breast cancer is one of the most common and fatal cancer diseases that affect women worldwide. As is true with most other cancer diseases, early detection of breast cancer is very crucial for proper medical treatment because treatment of advanced breast cancer will be much more difficult and inconsistent. Screening and testing of breast cancer biomarkers, either genetic or proteomic, are among techniques used for diagnosis of breast cancers. Nevertheless, none of the biomarkers is by itself sensitive and selective enough for diagnosis of breast cancer, and thus, multi-analyte assays towards detection of multiple breast cancer biomarkers from different classes …

Population Biology And Disturbance Ecology Of A Native North American Bamboo (Arundinaria Gigantea), Paul R. Gagnon

LSU Doctoral Dissertations

This dissertation explores effects of windstorm and fire disturbances on the clonal and reproductive biology of cane (Arundinaria gigantea Muhl., Poaceae). In this collection of studies, multiple disturbances interact in complex ways, and some interactions appear only after a substantial lag. One implication of this research is that multiple, interacting disturbances might strongly influence the boundary between monodominant and species-rich plant communities. Cane is the only bamboo native to the United States, and once covered vast areas of bottomlands in the southeastern U.S. in monodominant stands called “canebrakes.” The study took place on the Buckhorn Wildlife Management Area in Tensas …

Applying Intellectual Development Theory To College Student Drinking, Linda Marie Regira

LSU Doctoral Dissertations

This study evaluates the presence of a relationship between a student’s level of Intellectual Development, as measured by Moore’s Learning Environment Preferences (LEP) test, and harmful drinking behavior in college students. An online survey instrument was sent to a random sample of 3,000 undergraduate students at a large public research-intensive four-year college in the South via student email accounts. The survey instrument included items about student drinking behavior, perception of peer student drinking behavior, and the Learning Environment Preferences Test. The results showed that there is a statistically significant relationship (inverse) between intellectual development and binge drinking behavior, after controlling …

Art Informing Science Education: The Potential Contributions Of Ornithological Illustration To Ecology Education, Vanessa Hunt

LSU Doctoral Dissertations

Birds serve as an excellent group of organisms from which to introduce the study of ecology, being of inherent aesthetic interest to many otherwise uninterested in science, and are also ubiquitous in the immediate environment of many students. By extension, images of birds might serve as a valuable resource for the ecology educator, and bird artists – as a subset of ecologists - might provide useful models for expertise in ecology. This study examines the potential contributions of bird artists and bird art to education in ecology at the high school and college level. Eight contemporary bird artists were interviewed …

Cryopreservation And Intracytoplasmic Sperm Injection With Bovine Epididymal Spermatozoa, Carlos Andres Guerrero

LSU Doctoral Dissertations

Recently, interest in the preservation of epididymal sperm as a potential source of valuable genes for genome resource banks has escalated. The development of a successful protocol to recover and cryopreserve sperm harvested from the epididymides would salvage germplasm from genetically valuable males that are injured and can no longer mate or have unexpectedly died and can be used as a model for the preservation of male gametes from endangered species. In a series of experiments, epididymal sperm was successfully harvested, cryopreserved and used for intracytoplasmic sperm injection. In Experiment I, ethylene glycol was found to cause significantly (P<0.05) less osmotic damage to bovine sperm during a one step addition and/or removal at 4°C as compared with glycerol in all concentrations evaluated. Furthermore, prolonged exposure (5 days at 4°C) of ethylene glycol was found to be less toxic than glycerol to sperm. In Experiment II, it was demonstrated that glycerol was more effective than ethylene glycol in providing protection against freezing injury during the cryopreservation process in the concentrations evaluated. In Experiment III, it was demonstrated that epididymal sperm retrieval using seminal plasma is beneficial to enhance sperm overall and progressive motility characteristics and to protect it from morphological abnormalities derived from the freezing process. In Experiment IV, a one step dilution process for removal of glycerol from cryopreserved epididymal sperm was found to significantly affect plasma membrane integrity and mitochondrial function of sperm previously exposed to seminal plasma. However, seminal plasma exposure did not have any significant detrimental effect on acrosome integrity. Furthermore, it was demonstrated that the longevity and survivability in vitro during a 4-hour incubation period at 37°C of post-thaw epididymal sperm exposed to seminal plasma prior to cryopreservation was not compromised when compared with the control extended sperm. In Experiment V, we have demonstrated that fertilization, blastocyst and fetal development could be achieved with cryopreserved bovine epididymal sperm by intracytoplasmic sperm injection (ICSI). To our knowledge, this is the first report in the United States and second in the world to use bovine epididymal sperm for ICSI. We achieved far markedly improved blastocyst rates over those results recently reported in the first study originating in Japan.

Nutrient Constraints On Plant Community Production And Organic Matter Accumulation Of Subtropical Floating Marshes, Guerry O., Jr. Holm Jr.

LSU Doctoral Dissertations

In the cycle of delta growth and decay, peat-forming wetlands span a time and space continuum. Later in the delta cycle, freshwater floating marshes become increasingly removed from external sediment subsidy and internal nutrient cycling controls plant productivity and organic matter accumulation. An interesting question is whether increased external nutrient loading can affect the basic processes that lead to peat formation—plant production and organic matter decomposition. I conducted several field studies to understand whether belowground organic matter accumulation and decomposition were affected with increased nutrient exposure; in addition, the plant community was monitored over three years. A laboratory soil respiration …

Tropical Pyramids: Dung Beetle Richness, Abundance, And Biomass, Meghan Gabrielle Radtke

LSU Doctoral Dissertations

Volume is a proxy for biomass in hard bodied arthropods (P < 0.0001). I constructed biomass-volume equations for Neotropical (P < 0.0001), temperate (P < 0.0001) and 12 Neotropical genera of scarabs, of which 11 were highly significant. The effect of short term (< 1 year) alcohol storage on volume was negligable. I found scarab volume on geologically old soils in the Amazon was one-third that of the geologically young Amazon (P < 0.0001). Species richness (P = 0.0002), Chao 1 (P = 0.0003), Fisher’s  (P = 0.008) and Margalef indices (P = 0.0003) were greater on young soils. Menhinick (P = 0.54), Simpson (P = 0.54) and rarefied species richness (P = 0.24), which correct for sample size differences, indicated no difference in diversity. Young Amazonian soils likely support a higher volume and abundance of scarabs than old soils, but diversity across Amazonia may be similar. I compared beta-diversity of scarab communities across Amazonia. Species rank-abundance curves did not differ among sites whereas volume-abundance distributions and volume-rank abundance curves indicated a larger range of scarab sizes in Brazil than Ecuador. At local levels (<62 km), communities were similar whereas at large distances (>1750 km), they were different. Differences between Brazil and Ecuador may be explained by varied soil age and productivity. I examined the effects of tropical forest fragmentation on scarabs, comparing my results with three other studies from the same site. Among 1, 10, and 100-ha fragments and continuous forest, I found two important trends; beetle biomass and species richness increased with fragment area per sampling effort. Comparing all four studies, diversity increased with fragment size, and by my rarefaction analyses, two studies demonstrated beetle volume increased with fragment size. …

Modeling The Effects Of Endocrine Disrupting Chemicals On Atlantic Croaker: Understanding Biomarkers And Predicting Population Responses, Cheryl Anne Murphy

LSU Doctoral Dissertations

A number of environmental stressors have been shown to interfere with reproductive and behavioral processes of fish by interfering with endocrine function. Most biomarkers of endocrine disturbance tend to be static measurements from dynamic systems making them difficult to evaluate within the context of an individual, or subtle effects that do not relate well to endpoints of ecological significance. I present an approach that uses a series of models, based on Atlantic croaker, to extrapolate laboratory results to indicators of individual and population health. First, I created a physiologically based model that simulates vitellogenesis in a female fish. The model …

Louisiana Cotton, Rice, Soybean And Sugarcane Farmer Stakeholders: Who Are They And What Are Their Perceptions Of Farming Practices As Related To The Environment, Robert James Soileau

LSU Doctoral Dissertations

This study identified the stakeholders of Louisiana plant commodity farmers and rated them in terms of importance. Findings of this study show that farmers/ranchers, LSU AgCenter Experiment Station Research personnel, family, consumers, farm labor and agriculture chemical, fertilizer and seed dealers are the most important stakeholders. The second aspect of this study was to discover the stakeholder perceptions of agricultural practices and their relationship to the environment. An environmental perceptions survey was conducted with two of the most important stakeholder groups identified – Experiment Station Research Faculty associated with plant commodities and Louisiana consumers. LSU AgCenter Experiment Station Research Faculty …

Gender And Policing : An Analysis Of Police Departments As Gendered Organizations, Kimberly L. Seavey

Dissertations and Theses @ UNI

Drawing upon eighteen semi-structured, in-depth interviews with women officers from three municipal police departments, I examine the work lives these women experience and how their work lives are influenced by gender. I explore three categories in this analysis: (1) work environment; (2) social relations of work; and (3) occupational identity and role conflict. The analysis is based on in-depth interviews, participant observation, and archival data consisting of documents gathered from all three police departments. The study is guided by Joan Acker' s (1990, 1992a, 1992b) "theory of gendered organizations." I apply Acker's (1990, 1992a, 1992b) theory to determine if the …

The Crystal Structure Of A Dna-Binding Protein, Hucr, From Deinococcus Radiodurans R1: A Member Of The Marr Family Of Winged-Helix Transcriptional Regulators, Hansen Bordelon

LSU Doctoral Dissertations

The MarR family of transcriptional regulators is an important group of prokaryotic DNA binding proteins. As the family name implies, multiple antibiotic resistance, members of the MarR family often regulate the expression of resistance genes to multiple antibiotics, organic solvents, household disinfectants, detergents, and oxidative stress agents. Most MarR members act as transcriptional repressors and exist as homodimers in both free and DNA-bound states. DNA-binding is mediated via a winged-helix fold and is often relieved by anionic lipophilic ligands. Deinococcus radiodurans R1 was found to encode a 181 residue MarR homolog designated HucR (hypothetical uricase regulator). Biochemical evidence has shown …

Substrate Utilization In Skeletal Muscle And Adipose Tissue, Lauren M. Sparks

LSU Doctoral Dissertations

Obesity and Type 2 diabetes are associated with high fat diet (HFD), reduced mitochondrial mass and function and insulin resistance as characterized by glucose disposal and relative to body fatness. We hypothesized that (a) HFD affects expression of genes involved in mitochondrial biogenesis and function, (b) carbohydrate metabolism and storage is under transcriptional control and (c) both overall fatness and characteristics of adipose tissue influence the interplay between free fatty acids (FFAs) and insulin-stimulated glucose disposal. To test hypotheses “a” and “b”, we fed 10 insulin-sensitive males an isoenergetic HFD for 3 days with muscle biopsies before and after intervention. …

Vegetational Change And Land Degradation In The Lake Baringo Area, Kenya, During The Late Holocene: Evidence From The Paleorecord And Remote Sensing, Lawrence Morara Kiage

LSU Doctoral Dissertations

This dissertation investigates the history of vegetational changes and land degradation in the Lake Baringo area, Kenya, East Africa, during the Late Holocene. It uses 14C -and 210Pb-dated fossil pollen, fungal spores, microscopic charcoal, and stratigraphic record from lake-sediment cores to reconstruct the paleoenvironment in the East African region. More recent changes in the Lake Baringo are examined using remote sensing imagery. These data provide one the first high-resolution late Holocene pollen records from the semi-arid region of Kenya (and one of only a handful from East Africa in general). Lake Baringo records a sedimentation rate of 1 cm yr-1, …

Sva Elements: Hominid Specific Retrotransposons, Hui Wang

LSU Doctoral Dissertations

SVA is a composite repetitive element named after its main components, SINE, VNTR and Alu. There are ~3000 SVA elements in the human genome. A genomic distribution analysis indicates that SVA elements are enriched in G+C-rich regions but have no preferences for inter- or intra-genic regions. A phylogenetic analysis of these elements resulted in the recovery of six subfamilies that were named SVA_A to SVA_F. The composition, age and genomic distribution of the different subfamilies have been examined. Subfamily age estimates indicate that the expansion of four SVA subfamilies (SVA_A, SVA_B, SVA_C and SVA_D) began before the divergence of human, …

Application Of Polymeric Microfluidic Devices For Separation Of Single-Stranded Dna, Shawn Llopis

LSU Doctoral Dissertations

Microsystems targeted for DNA sequencing, especially those focused on electrophoretic separations, are rapidly proving their viability to genomic research, mimicking the progress made when capillary electrophoresis developed from miniaturizing slab gel electrophoresis techniques. Being the more recent electrophoretic separation platform, the commercial availability of microchip electrophoresis devices remains relatively limited. To this extent, high-aspect ratio microstructures formed in thermo plastics have been developed using rapid fabrication methods from molding tools designed for mass replication of high-aspect ratio microfeatures. In this work, the choice and compatibility of poly(methylmethacrylate) (PMMA) – the primary substrate for DNA separations in this work – was …

Motivating Rehabilitation By Distorting Reality, James L. Patton, Yejun Wei, Chris Scharver, Robert V. Kenyon, Robert A. Scheidt

Biomedical Engineering Faculty Research and Publications

We have found, through a series of recent experiments, encouraging evidence that the neuro-motor system is motivated to change motor patterns when exposed to visuo-motor tasks. We have also shown that the learning of these tasks can be heightened with forces and/or visual distortions that appropriately manipulate the error. This process does not require intense concentration and it is often considered a game. We describe the next generation of robotic large-workspace, three dimensional haptics/graphics systems for rehabilitation

The Influence Of Tobacco Merchant Education And Enforcement Activities On The Rate Of Tobacco Use Among Youth In Louisiana, Leslie Hope Brougham

LSU Doctoral Dissertations

The purpose of this study is two-fold: 1) to determine whether a relationship exists between the self-reported tobacco use by secondary students in Louisiana and the tobacco sale rate to persons under the age of 18 in those parishes; and 2) to investigate the relationship between merchant education in a parish and the parish tobacco sale rate to persons under the age of 18 in those parishes. Multiple data sources were utilized to include tobacco use among secondary students, education provided to merchants, and tobacco sales to minors compliance checks. Aggregated parish data for each of the data sources were …

Suicide And Community Traumatic Events: Is There A Connection?, Regina T. Praetorius

LSU Doctoral Dissertations

The purpose of this study was to determine if a relationship exists between community traumatic events (CTEs) such as the September 11, 2001 terrorist attacks and the temporal distribution of suicide in a metropolitan Louisiana parish (county) in the Southern United States over the period of January 1, 1994 to December 31, 2004. The researcher used data on suicides (homicides and accidental deaths were used for comparison) in the selected parish to describe the distribution of suicides over the 11 year period. A procedure was developed for identifying and categorizing CTEs sustained by the selected parish (county). A spectral analysis …

Factors Influencing The Importance Of Incorporating Competencies Regarding Mass Casualty Incidents Into Baccalaureate-Degree Nursing Programs As Perceived By Currently Employed Faculty, Kristin Whitty

LSU Doctoral Dissertations

Whether they are naturally occurring, caused by environmental forces, or generated by humans, disasters have placed extraordinary stresses on society. Following September 11, 2001, the Department of Homeland Security was created to protect the nation and coordinate responses to future emergencies at the federal, state, and local levels. However, Governmental agencies can’t handle all aspects of mass casualty events. Healthcare professionals, such as nurses, who are knowledgeable and trained in mass casualty incidents (MCIs) are needed to provide competent care to the victims. Although others expect a knowledgeable nursing response, the majority of nurse educators have not received mass casualty …

Polyetheretherketone As A Biomaterial For Spinal Applications, Jeffrey M. Toth, Mei Wang, Bradley T. Estes, Jeffrey L. Scifert, Howard B. Seim, A. Simon Turner

Biomedical Engineering Faculty Research and Publications

Threaded lumbar interbody spinal fusion devices (TIBFD) made from titanium have been reported to be 90% effective for single-level lumbar interbody fusion, although radiographic determination of fusion has been intensely debated in the literature. Using blinded radiographic, biomechanic, histologic, and statistical measures, we evaluated a radiolucent polyetheretherketone (PEEK)-threaded interbody fusion device packed with autograft or rhBMP-2 on an absorbable collagen sponge in 13 sheep at 6 months. Radiographic fusion, increased spinal level biomechanical stiffness, and histologic fusion were demonstrated for the PEEK cages filled with autograft or rhBMP-2 on a collagen sponge. No device degradation or wear debris was observed. …

Perceptually Meaningful Image Editing: Depth, Reynold J. Bailey, Cindy Grimm

All Computer Science and Engineering Research

We introduce the concept of perceptually meaningful image editing and present two techniques for manipulating the apparent depth of objects in an image. The user loads an image, selects an object and specifies whether the object should appear closer or further away. The system automatically determines target values for the object and/or background that achieve the desired depth change. These depth editing operations, based on techniques used by traditional artists, manipulate either the luminance or color temperature of different regions of the image. By performing blending in the gradient domain and reconstruction with a Poisson solver, the appearance of false …