Digital Commons Network^™

Examining Preferences For Prevention Of Louisiana's Wetland Loss, Ross Gordon Moore

Theses and Dissertations

This study analyzed preferences for wetland-loss prevention in coastal Louisiana. Data were obtained through a contingent-valuation mail survey of a random sample of Louisiana households. Results, based on 511 responses, indicate that respondents have a strong preference for a short-run program (72.41% chose this program over a long-run program or no action). Respondents that had higher incomes, were white, had prior knowledge of ongoing restoration efforts, and had confidence in government were more likely to support some program relative to no action, as were those citing hurricane, environmental, and/or climate-change protection as their primary concern. Older respondents and those with …

Comparison And Analysis Of A Lignite Seam In The Wilcox Group, Choctaw And Kemper County, Mississippi, Joshua M. Johns

Theses and Dissertations

The Wilcox Group includes the most abundant lignite bearing strata in Mississippi. Currently, the only lignite mine in Mississippi is located in Choctaw County with a proposed mine in Kemper County. Six lignite seams are currently mined in Choctaw County. One of those seams is believed to be continuous, from SE Choctaw County through central Winston County, NE Neshoba County into SW Kemper County (roughly 50 miles). Establishing a cross section from Choctaw to Kemper County verifying a continuous lignite seam would provide a stratigraphic marker horizon in correlation along strike, which is uncommon in the Wilcox Group sediments. Through …

Ecological Factors In Social Skills Acquisition: High School Students With Emotional And/Or Behavioral Disorders In The United States And Norway, Sarah K. Anderson

Theses and Dissertations

The purpose of my study was to develop a grounded theory of the underlying social processes and/or other ecological factors that impact the effectiveness of skill acquisition for students with emotional and/or behavioral disorders (EBD) in "sister" cities located in the United States (Site One) and in Norway (Site Two). Theory development was based on in-depth investigation of 10 students with EBD, five at each research site. This study looked at ecological factors impacting the learning of a new social skill, the socialization skills of students with EBD, and differences in skill acquisition between the two research sites.

Based on …

Comparing Pedestrian Behavior Before And After Installation Of A Countdown Pedestrian Signal At An Intersection, Carl W. Warrene

Theses and Dissertations

The objective of this study was to evaluate the effects of countdown signals at an intersection on pedestrian behavior. A "before" and "after" study design was used. Survey data for this experiment was collected over multiple days in two collection periods. More than 330 random pedestrians were observed for each collection period. "Before" data was collected at the subject intersection with traditional, non-countdown timer pedestrian signals in place. The signals were replaced with countdown pedestrian signals and "after" data were collected. Pedestrian behavior, demographic data and experiment metadata was collected for each observation collection period.

The Sediment And Water Column Biogeochemistry Of Weeks Bay During Bottom Water Hypoxic And Norm-Oxic Events, John Eric Ezell

Theses and Dissertations

Hypoxia occurs when the dissolved oxygen concentrations in water fall below 2 mg/L, and negative impacts to flora and fauna can result. In this study, sediment core and water column measurements were collected and processed through several laboratory and field methods to better understand the biogeochemistry of Weeks Bay (WB), AL. Results show that salinity, temperature, and dissolved oxygen fluctuate on a diurnal cycle. Results also show a significant difference in water column and sediments between different years and sites. The western side of WB was found to more likely to go hypoxic than other portions. Conclusions of this research …

Quantitative Descriptive Analysis And Development Of A Lexiconal Language For Pueraria Lobata (Kudzu) Leaves And Utilization Of Pueraria Lobata (Kudzu) Root Starch In Conventional Milk Yogurt, Husniye Imamoglu

Theses and Dissertations

Fresh Pueraria Lobata (kudzu) leaves were evaluated by sensory descriptive analysis. Covariate analysis determined the effects of leaf size and time on 32 sensory variables. Best fit polynomial regressions over time were determined for responses affected. Correlation analyses were executed on attributes in each of the sensory groupings with those variables which were significantly affected by time. Sensory properties of dried kudzu leaves were compared by using three different drying techniques: Convection oven, vacuum and food dehydrator. Covariate analysis determined the effects of leaf size, days, dryers and their interaction on 44 sensory variables. The fitted response regressions were determined …

Soil Modification And Potential Allelopathy: An Investigation Into How The Invasive Casuarina Equisetifolia L. (Australian Pine) Modify Their Environment, Charlotte P. Buehler

Theses and Dissertations

Casuarina equisetifolia L. is a noxious plant species known to be invasive in the West Indies. Not much is known about its impact on its host environment. This study’s objective was to quantitatively compare physical and chemical soil differences between sites dominated by and devoid of Casuarinas. This study also conducted growth chamber experiments to determine potential for allelopathy. It was demonstrated that sites dominated by Casuarinas differed significantly in K, P, organic matter, and leaf litter depth. Application of Casuarinas leachate showed reduction in germination of radish and bean seeds by at least 32% and 70%, respectively. Once germinated …

Population Estimation And Landscape Ecology Of The Puerto Rican Nightjar, Rafael Gonzalez

Theses and Dissertations

The Puerto Rican Nightjar Caprimulgus noctitherus is an endangered species found in forest of southern Puerto Rico. I documented density of nightjars in Guánica Forest, the region of Guayanilla-Peñuelas, and Susúa Forest. The geographic range of the species was expanded because of this study and presence documented in a number of new localities. Stand level habitat model indicated forest type and midstory visual obscurity best predicted nightjar habitat. Landscape model predicted considerably more suitable nightjar habitat exists than had been previously estimated (> 30%) and highlighted several areas of importance for the species. I evaluated nightjar population estimation techniques and …

Potencies Of The Resistant Maize Genotypes Against Biotic Stresses And Understanding Their Strategies, Arunkanth Ankala

Theses and Dissertations

Maize is an important food crop in most parts of the world including the United States. The plants growing in the field are constantly challenged with various biotic stresses like insect herbivores and fungal pathogens. The physical wounds produced on the growing crops by the insects render the plants more vulnerable to the fungal pathogens. Hence developing both insect and fungal resistant maize varieties is crucial to benefit more from the harvest. Several studies have been in advance in this direction and as a consequence insect, in particular lepidopteran larve resistant maize genotype Mp708 and Aspergillus flavus resistant genotype Mp313E …

Decrescendo Vocalizations Of Female Mallards And Mimicry By Duck Callers, James Thomas Callicutt

Theses and Dissertations

Female mallard ducks (Anas platyrhynchos) exhibit diverse vocalizations. Duck hunters mimic these vocalizations using artificial calls made from hardwoods or plastics. Hardness of these calls and extent to which humans can mimic live mallards using an artificial call were unknown before this study. I compared hardness of 7 species of hardwoods and cast acrylic and found acrylic, cocobolo (Dalbergia retusa), bocote (Cordia alliodora), osage orange (Maclura pomifera), and pecan (Carya sp.) were the hardest materials tested. I also compared acoustic metrics of field recordings of vocalizing female mallards to those of experienced duck callers using calls of these materials equipped …

Energy Analysis Of A Micro-Chp Demonstration Facility, Paxton Keith Giffin

Theses and Dissertations

Cooling, Heating, and Power (CHP) systems have been around for decades, but systems that utilize 20 kW or less, designated as Micro-CHP, are relatively new. Micro-CHP systems show the most promise for a distributed generation scheme to decentralize the national energy grid. A demonstration site has been constructed at Mississippi State University to show the advantages of these systems. This study is designed to evaluate the performance of a Micro-CHP system and a conventional high-efficiency system. Performance and cost factors can be evaluated for the demonstration site operating under either the CHP system or the conventional system. These results are …

Estimation Of Aboveground Terrestrial Net Primary Productivity And Analysis Of Its Spatial And Temporal Trends In The Conterminous United States From 1997 To 2007 Using Nasa-Casa Model, Sami Khanal

Theses and Dissertations

This study estimated monthly and annual Net Primary Productivity (NPP), an important indicator of carbon sequestration, in the Conterminous US from 1997 to 2007 using Carnegie-Ames-Stanford Approach. Vegetation condition, temperature, precipitation, photosynthetically active radiation and soil water holding capacity were used as model’s inputs. NPP values were lower than mean annual values during the year 2000 to 2003 which was probably due to extreme drought conditions during these years. Higher NPP per square meter was generally found in Savannah and Subtropical eco-divisions whereas Tropical/Subtropical deserts had the lowest NPP. Southeastern states had the highest NPP per square meter thus, made …

An Exploration Of Amniotic Fluids As A Possible Source Of Fetal Infection In The Feline Immunodeficiency Virus (Fiv)-Infected Cat Model Of Pediatric Aid, Brittany Tenille Clay

Theses and Dissertations

The role that amniotic fluid (AF) may play in HIV vertical infection is unresolved. We used the FIV-infected cat model to study this question. We hypothesized that AF may be a source of fetal infection if the virus is present in the fluids. However, virus neutralizing (VN) antibodies in AF may limit vertical transfer. Fetuses were delivered from FIV-infected queens by cesarean section at early and late gestation. AFs were aspirated from intact fetal membranes and tested for viral antigen and RNA and for FIV-specific antibody. Randomlyselected samples were tested for VN activity using a syncytium reduction assay. Neither FIV …

We Are Clay People: The Struggle Against Choctaw Communal Dissolution, 1801-1861, Gary Coleman Cheek

Theses and Dissertations

Acculturation has become an integral part of scholarship about Native Americans in the Southeast. Recent studies have focused on trade the eighteenth century and Choctaw entry into the American market economy during the beginning of the nineteenth century. This study analyzes acculturation from 1801 to 1861, carrying the story about cultural change and persistence through the Removal era and to the American Civil War. It argues that while Choctaws acculturated to survive, prosper, and protect autonomy in a changing world, they continuously battled communal dissolution, which threatened to destroy their nation. Some individuals attempted to promote new methods of subsistence, …

Switchgrass (Panicum Virgatum L.) Intraspecific Variation And Temperature Tolerance Classification Using In Vitro Seed Germination Assay, Ramdeo Seepaul

Theses and Dissertations

An experiment was conducted to determine temperature effects on switchgrass seed germination, a native species with feedstock potential for the biofuel industry. Stratified seeds were germinated at constant temperatures, 15 to 45°C with 5°C interval. Maximum seed germination (MSG) and germination rate (GR), estimated by fitting sigmoid function to germination-time series data, varied among genotypes. Quadratic and bilinear models best described the MSG and GR responses to temperature, respectively. The mean cardinal temperatures, minimum, optimum and maximum, were 8.1, 26.6 and 45.1ºC for MSG and 11.1, 33.1 and 46.0ºC for GR, respectively, varied among genotypes. Genotypes were classified for temperature …

Macrophyte Re-Establishment And Deductive Gis Modeling To Identify Planting Locations For Fish Habitat Enhancement Projects, Jonathan Paul Fleming

Theses and Dissertations

Aquatic macrophytes are important components in structuring aquatic communities because they provide physical and biological functions that contribute to the stability of the ecosystem. Macrophytes provide the basis for the aquatic food-web and also provide habitat and refugia for aquatic fauna. In systems that lack macrophytes, anthropogenic re-establishment may be a feasible management approach to improve aquatic ecosystems. Understanding environmental factors that regulate colonization, dispersal, and persistence of aquatic macrophytes is pertinent to re-establishment efforts. The purpose of this study is to test hypotheses regarding success of macrophyte re-establishment efforts in Little Bear Creek Reservoir, Alabama using different macrophyte species, …

Making Milking Modern: Agriculture Science And The American Dairy, 1890-1940, Micah Aaron Rueber

Theses and Dissertations

In the late nineteenth century most dairy farmers went about their work in much same manner as had their predecessors centuries earlier. However, by 1940 most farmers practiced recognizably modern dairying techniques. Use of mechanical milking machines was widespread and growing, farmers compounded rations by combining feeds that blended precise proportions of proteins, carbohydrates, fats, and vitamins, and breeders, eager to maximize the influence of productive bloodlines, evaluated their animals with the use of scientific scorecards and employed intense breeding plans that relied on various forms of inbreeding in order to fix the desirable aspects of prized cattle. Yet the …

Immunomodulator Expression In Trophoblasts From The Feline Immunodeficiency Virus (Fiv)-Infected Cat As A Contributor To Placental Immunopathology And Reproductive Failure At Early- And Late-Term Pregnancy, Veronica Lynn Scott

Theses and Dissertations

Mother-to-child transmission (MTCT) of HIV accounts for more than 90% of pediatric infections worldwide, yet the mechanism of vertical transfer remains unknown. The feline immunodeficiency virus (FIV)-infected cat is a cost-effective, small-animal model of HIV pathogenesis and MTCT, which produces a high rate of reproductive failure and fetal infection in litters delivered at early- and late-term gestation. Our previous data suggest that FIV infection may dysregulate placental cytokines and compromise pregnancy. We hypothesized that FIV-infection may cause dysregulation of placental cytokine expression, and aberrant expression of these cytokines may potentiate inflammation and transplacental infections. The purpose of this project was …

Exceptionally Well-Preserved Quaternary Fossils From Sawmill Sink Blue Hole, Abaco, The Bahamas, Nancy Ann Albury

Theses and Dissertations

A diverse assemblage of exquisitely-preserved fossil animals and plants were collected from Sawmill Sink blue hole in Abaco, Bahamas. More than 40 species have been identified including extinct tortoise, an extant crocodile, and birds that no longer live in The Bahamas. This study addresses the mechanisms that preserve fossils in blue holes and discusses paleoecological implications from faunal diversity and sediment composition. Blue holes are waterilled caves with surface openings that may trap animals and surface-driven vegetation. In Sawmill Sink the talus cone within the halocline acts as a substrate on which organics collect that drive microbe ecology. Their byproducts, …

Constructs: Truth, Lies, And Humanity, Nathan Hansen

Theses and Dissertations

This thesis is a discussion of my ideas, struggles and outcomes experienced during the making of my two bodies of work, Devices and Relics. These two bodies of work explore fleeting moments, the intrinsic values of labor and imagination with reference to sedentary living and labor in contemporary American society.

Development And Implementation Of A Tissue Specific Microrna Prediction Tool For Identifying Targets Of The Tumor Suppressor Microrna 17-3p, William Budd

Theses and Dissertations

A unique computational approach was undertaken to identify targets of miR-17-3p that impart an oncogenic potential to the cells of the prostate. Utilizing this approach, we identified insulin growth factor receptor 1 (IGF1R) as a potential target of miR-17-3p. IGF1R imparts an oncogenic approach to the cells by helping cells escape apoptosis, become hypertrophic and increase the production of extracellular proteases that allow cells to detach from neighbors. The regulation of insulin growth factor receptor 1 by human microRNA-17-3p was evaluated using a western blot analysis of prostate cancer cell lines. Protein levels were compared in a cell line that …

Voice On The Skin, Sarah Turner

Theses and Dissertations

“The body can write on the skin from the inside—the soul, the mind, and the passions rise to the surface in boils, blushes, and rashes, and the invisible inside speaks by writing from the other side of the page”. -James Elkins Skin not only covers but reveals what is behind it. I utilize its language as indicator of flaws and pathologies. I depict and manipulate this, not just as it already exists with the human body, but as projections of my psychological states onto inanimate objects. Proposing that sight is a kind of touch, we touch with our minds, through …

Focal Adhesion Kinase, A Major Regulator Of Oligodendrocyte Morphological Maturation And Myelination, Audrey Lafrenaye

Theses and Dissertations

The formation of the myelin sheath is a crucial step during development because it enables fast and efficient propagation of signals within the limited space of the mammalian central nervous system. During the process of myelination, oligodendrocytes actively interact with the extracellular matrix (ECM). These interactions are considered crucial for proper and timely completion of the myelin sheath. However, the exact regulatory circuits involved in the signaling events that occur between the ECM and oligodendrocytes are currently not fully understood. Therefore, in this dissertation we investigated the role of a known integrator of cell-ECM signaling, namely, focal adhesion kinase (FAK), …

Mechanisms Associated With Aging And Age-Related Disease In Drosophila, Melanie Jones

Theses and Dissertations

Aging is an intrinsic process that is independent of obvious disease. In contrast to normal aging, age-related diseases are conditions that typically manifest at advanced ages, are associated with explicit pathology and cause disability and premature death. We used Drosophila as a model to investigate the molecular-genetic mechanisms associated with aging and age-related disease. Age-related locomotor impairment (ARLI) is a serious condition for the elderly and greatly impacts their quality of life. Toward identifying genes and mechanisms that influence ARLI, we performed a forward genetic screen using Drosophila mutants. This screen identified a loss of function mutant in PDK1, a …

Patterns In Fish Community Structure In A Regulated River, Richard Davis

Theses and Dissertations

I examined the abundance, composition, and distribution of fish communities in the lower Roanoke River, a hydropeaking system in North Carolina. Fishes were sampled at before and after peaking events over three years; 2007 to 2009. I evaluated trends in species richness, diversity, and assemblage composition. There were no significant differences in either richness or diversity suggesting consistent trends in richness and diversity throughout the study. I used non-metric multidimensional scaling (NMDS) to create a community composition model. Fish composition was noticeably greater post-peaking and changed minimally across time and event. There were no statistically significant differences in species composition …

An Affordable Living Community, Erin Richardson

Theses and Dissertations

Beginning with a former grocery store building, “An Affordable Living Community,” explores the possibilities of redesigning big box buildings. Here, the building is transformed into an affordable living community - a place for people to live, work, learn, and interact. The renovation creates a place for not only its residents, but also the surrounding neighborhoods. The building provides the challenges of breaking the generic, window-less facade, as well as bringing light into the building. This model would encourage the health, learning, and support of its community.

Fabricating Womanhood, Emily Fox

Theses and Dissertations

The exhibit, Fabricating Womanhood, was an attempt to explore the construction of gender and identity. While the artwork addressed well researched and documented feminist themes the artwork also stemmed from personal experiences and my coming-of-age process. The resulting installation included video, prints, painting, ceramics and found objects arranged in a set-like house construction of life-size proportions.

Characterization Of Adherence, Cytotoxicity And Biofilm Formation By Gardnerella Vaginalis, Jennifer Patterson

Theses and Dissertations

Worldwide, bacterial vaginosis (BV) is the most common vaginal disorder in women of childbearing age. BV is of major clinical importance due to its ability to significantly affect pregnancy outcome and enhance the transmission and acquisition of HIV. BV is characterized by a dramatic shift in the vaginal microflora; in most BV cases, the predominant bacterial species is Gardnerella vaginalis. It has been demonstrated that G. vaginalis forms an adherent biofilm on the vaginal epithelium of women with BV. Furthemore, evidence suggests that the high rate of recurrence associated with BV is related to incomplete eradication of the biofilm. The …

Electrophysiological Analysis In An Animal Model Of Dystonia, Kunal Chaniary

Theses and Dissertations

Dystonia is a movement disorder characterized by patterned, repetitive, and sustained muscle contractions that cause ineffective and often painful movements. The overall goal of this project was to understand the physiological mechanisms of dystonia in a rodent model as a basis for developing innovative treatments for secondary dystonias. The first half of the project was focused at developing essential techniques for systematically investigating the movement disorder in these animals. For achieving this, an innovative, multi-faceted approach was pursued starting with electromyographic (EMG) analysis for animal model validation, gait analysis for dystonia quantification, and development of a novel stereotaxic apparatus for …

It's Always Somebody's Paris: An Examination Of Place In Nonfiction Writing, Jessica Sculthorpe

Theses and Dissertations

IT’S ALWAYS SOMEBODY’S PARIS: AN EXAMINATION OF PLACE IN NONFICTION WRITING By Jessica E. Sculthorpe This thesis examines the importance of place in nonfiction writing, using both the author’s personal experience as a student in Paris and the writings of other Americans in Paris, including members of the Lost Generation. The first two chapters examine the author’s experience as a young student in Paris. The third and fourth chapters contain the author’s reflection on the process of writing the thesis and an examination of the ways in which other writers have written about Paris in their own nonfiction writing.