Digital Commons Network^™

Integrated Agronomic Management Practices For Tall Fescue In Mississippi, Patton J. Slusher

Theses and Dissertations

Tall fescue (Schedonorus arundinaceus), is a cool season perennial that provides grazing into the early summer months for southern livestock. Grazing the tall fescue variety, Kentucky-31, has negative effects on animal health, particularly after jointing. Two studies were arranged as randomized complete blocks in a split-plot design, with three replicates to compare: the effect of ten herbicides on seedhead suppression, or the effect of inter-seeding legumes [white clover (Trifolium repens) or alfafla (Medicago sativa)] coupled with nitrogen supplementation on fescue yield and forage nutritive value. The herbicides imazethapyr + 2,4-D and without, metsulfuron + chlorsulfuron, reduced seedheads emergence, but not …

Evaluation Of Hybrids, Planting Dates, And Planting Densities On Corn Growth And Yield Under Rainfed Systems In Mississippi, Matthew W. Hock

Theses and Dissertations

Improved hybrid genetics and more efficient farming techniques have increased corn (Zea mays L.) production and grain yields for Mid-South farmers. Early planting is one technique to mitigate heat and drought stress that negatively influence grain production. The first objective was: a) determine the effect of early planting on grain yield, b) to determine the effects on physiological characteristics and c) determine if some hybrids are better suited for early planting. Data suggest there were yield advantages for early planted treatments. Starkville 2014 yields exhibited the greatest reduction of .80 Mg ha-1 for each week that planting was delayed. A …

Exploring The Role Of Dopamine In Stress Response And Aging In Drosophila Melanogaster - Implications For Neurodegenerative Diseases, Marley Elyse Hanna

Theses and Dissertations

Dopamine (DA) is a catecholamine that is involved in several neural functions such as modulation of locomotor behaviors, arousal states to appetitive aversive learning and memory. The relationships between DA, stress response and aging are unclear. This thesis examines numerous physiological, behavioral and biochemical parameters following perturbations in DA synthesis and transport in the Drosophila melanogaster model system. Intriguingly, elevated DA pools appear to confer protection, while depleted DA levels or transport increase susceptibility to oxidative insult. Resistance to oxidative stress in mutants with elevated DA levels was attributed to a significant up-regulation of glutathione S-transferase Omega-1. A sexually dimorphic …

Childhood Feeding Practices In African Americans, Nicole Somogy

Theses and Dissertations

The purpose of this study was to explore the feeding practices of minority children specifically looking at African Americans from birth to 11 years old to see if there are any red flags so that professionals can be alerted for a concern with obesity. Previous research conducted on feeding styles and patterns of adults have shown some clues as how a parent plays a key role in the etiology of childhood obesity (Chaidez & Kaiser, 2011). One strategy that is used when looking at obesity is to look at physical activity as well as parenting styles which includes authoritative, authoritarian, …

Suitability Of Great South Bay, New York To Blooms Of Pfiesteria Piscicida And P. Shumwayae Prior To Superstorm Sandy, October 29, 2012, Pawel Tomasz Zablocki

Theses and Dissertations

Pfiesteria piscicida and P. shumwayae are toxic dinoflagellates implicated in massive fish kills in North Carolina and Maryland during 1990s. A set of physical, chemica l, and biological factors influence population dynamics of these organisms. This study employs i nformation gathered from relevant literature on temperature, salinity, dissolved oxygen, pH, turbulent mixing, and dissolved nutrients, bacteria, algae, microzooplankton, mesozooplankton, bivalve m ollusks, finfish, and other toxic dinoflagellates, which influence Pfiesteria population dynamics. The research focused on whether conditions in the Great South Bay, Long Island, New York were suitable to blooms of Pfiesteria species prior to the passage of superstorm …

Selection And Use Of Pantoea Dispersa Strain Jfs As A Non-Pathogenic Surrogate For Salmonella Typhimurium Phage Type 42 In Flour, James R. Fudge

Theses and Dissertations

Salmonella, a common food pathogen, costs more than any other pathogen in the United States in terms of health care costs and loss of work due to the illnesses it causes. Low-moisture foods, especially flour, are susceptible to being contaminated by Salmonella. Food producers want flour to be pathogen-free but to also retain the same functionality of non-treated flour. Heat treatment is the most common method employed for lowering the concentration of pathogens in food. However, heating can result in the loss of the flour’s functionality. Pantoea dispersa strain JFS has been isolated from flour as a nonpathogenic bacterial surrogate …

Caffeine Use Within The Safety Sensitive Industry, Cory Austin Mullins

Theses and Dissertations

This study is an in-depth look at caffeine use and its effect on individuals who work within a safety and security sensitive job industry. The focus of this paper is on the current use of caffeine in our society as well as the overuse/abuse of the drug and the causes behind it. This paper will highlight the negative impacts caffeine has on the human body and its cognitive thinking skills but does not neglect the positive impacts as well. Caffeine in energy drinks and similar products is used in an attempt to retain one’s alertness and focus, with little regard …

My Sisters Myself: Exploring The Health And Wellness Practices Of African American Women, Carmen Alexis

Theses and Dissertations

African American women contribute disproportionately to disease in the United States. Researchers have repeatedly turned to issues related to poverty, access to medical care, and stress to explain this syndrome, however studies have shown that the disparities persist even in the absence of poverty and impaired access. Stress remains a constant in every discussion of disease in African American women, but what is it that fuels their particular brand of stress and how does it impact the health of African American women? The purpose of this mixed methods study was to explore the perceptions held by African American women in …

Does Simulation Improve Nursing Student Knowledge, Skills, And Attitudes In Identifying Delirium Superimposed On Dementia?, Sheryl A. Kelly

Theses and Dissertations

This dissertation is comprised of three manuscripts, to be submitted for publication, exploring the use of simulation in geriatric nursing education. The first manuscript is a literature review. Although, a number of articles exist on the use of simulation in nursing education, there is a paucity of research using simulation emphasizing the care of patients with dementia and delirium as a pedagogical strategy or those using a stringent research design.

The second manuscript provides an overview of two conceptual frameworks (National League for Nursing (NLN)/Jeffries Simulation Framework and situated cognition learning framework) and recommends merging them to guide researchers as …

The Emphasis Of Physical Activity Across The Curriculum; A Positive Approach To Increased Academic Achievement, Alexandra Maldonado

Theses and Dissertations

The purpose of this study was to assess whether physical activity has an effect on academic achievement in students. The presence of a physically active lifestylehas received much support due to its physiological and mental benefits. The establishment of such a lifestyle should begin at an early age; however, there has been a recent shift away from physically active programming within the school system that could perpetuate a healthier future. Pressure to increase academic achievement has led to the reduction and elimination of opportunities for physical activity, but these actions could have an adverse impact on students (Mahar, Murphy, Rowe, …

Drought And Nitrogen Effects On Maize Canopy Temperature And Stress Indices, David A. Carroll

Theses and Dissertations

Increased water scarcity due to changing climate, population growth, and economic development is a major threat to the sustainability of irrigated agriculture in the Western United States and other regions around the world. Management practices, such as controlled deficit irrigation, that seek to maximize the productivity of a limited water supply are critical. When using controlled deficit irrigation, remote sensing of crop canopy temperature is a useful tool for assessing crop water status and for more precise irrigation management. However, there is potential that nutrient deficiencies could compound the interpretation of water status from leaf temperature by altering leaf color …

Diabetes In Pregnancy: Improving Birth Outcomes In Native Americans Populations. What Are The Best Practices?, Kristina Smith

Theses and Dissertations

The purpose of this project is to identify the best practices in improving birth outcomes for Native American women with gestational diabetes (GDM). The true prevalence of GDM is unknown; however, pregnant women in the United States are being diagnosed at alarming rates. This project surveys the current practices being utilized to help improve outcomes. The research draws upon journal articles found on CINHAL, PUBMED and Cochrane databases. The results of this analysis of literature will be may be useful in determining best practices and interventions that will help improve birth outcomes in Native American women with GDM. Nursing and …

The Role Of Physical Fitness And Physical Activity On Academic Achievement Among Eighth Grade Students In Alabama, Jessica Baker O'Neal

Theses and Dissertations

The purpose of this correlational study was to determine the extent of the relationship between physical fitness, body composition, physical activity, and academic achievement. School leaders have justified the reduced time for physical activity and physical education as they take away from classroom instruction time; yet, national assessment outcomes have indicated the condition of education in America has failed to measurably improve student achievement. An additional public health concern, increased sedentary lifestyles and unhealthy-weight conditions have significantly increased in the past 30 years among American children and adolescents.

The researcher incorporated a quantitative design to examine these relationships in an …

Analysis Of The Effectiveness Of The F-15e Risk Management During Peacetime Operations, Elliot B. Vasquez

Theses and Dissertations

Human factors are causal or contributory in 80% of Class A mishaps in the Air Force. Risk management tools are used throughout the service in every aircraft to help mitigate the risk of those human factors occurring. The F-15E Strike Eagle community was selected for analysis on the effectiveness of its risk management program but the data was comprised on Class A mishaps from Accident Investigation Boards since 2000 between the F-15 (all models), F-16 (all models), and F-22. Cases were selected if there were human factors root causes or contributory. A fault tree analysis coupled with the Department of …

Influences On Students Choosing Majors In Agriculture, Willa Williams

Theses and Dissertations

With a shortage of agricultural graduates predicted for the United States workforce (Goecker, Smith, Smith, & Goetz, 2010) the purpose of the study was to identify influences on students choosing undergraduate majors in agriculture. Structural equation modeling analysis was used to examine independent variable constructs of student characteristics, environment, learning experiences, and task approach skills from Krumboltz's (1996) social learning theory of career decision making on the decision of students to choose an undergraduate major in agriculture. Variables were identified through previous research in field of study choice in agriculture and data was evaluated from the Education Longitudinal Study of …

Ecological, Localization And Functional Analysis Of Two Lysosomal Enzymes In Dictyostelium Discoideum, Sanaa Talib Jawed

Theses and Dissertations

Dictyostelium discoideum is a primitive eukaryote that has recognized useful in studying various aspects of lysosomal enzymes as well as development since it can differentiate from unicellular amoebae into a multicellular.In this study, we investigated the localization, ecological and molecular function of two lysosomal enzymes, hexosaminidase (NagA) and,,-glucosidase (GluA) proteins, by overexpressing the genes encoding them in D. discoideum. Separate cell-lines overexpressing a GFP-tagged versions of the full length DdNagA gene (GFP-NagA), mutant version of the NagA gene (GFP-NagA (N214S)), a GFP-tagged version of the full length DdGluA gene (GFP-GluA) and a mutant version of first 83 amino acids DdGluA …

The Perceptions Of The Unwanted Horse Population In Illinois 2015, Kelsey Annette Schueler

Theses and Dissertations

A survey to measure the perceptions of the unwanted horse population in the state of Illinois was developed. Horse owners, non-horse owners, and equine industry stakeholders in Illinois were the focus of the study. Participants were surveyed on their perceptions, awareness, and knowledge of the unwanted horse population in the state. Each survey included questions of current knowledge of legislation, background with equine, current methods to control the unwanted horse population, and methods they believe would benefit the population. A block style survey was developed, emailed to a statewide equine association listserv, and advertised through articles online. Findings show that …

Analysis Of The Microbial Community Along Three Sites Of The Rio Grande By Denaturing Gradient Gel Electrophoresis, Rebeca Imelda Castro

Theses and Dissertations

ABSTRACT Analysis of the Microbial Community of Three Sites Along the Rio Grande by Denaturing Gradient Gel Electrophoresis (May 2014) Rebeca Imelda Castro, B. A., Texas A & M International University; Chair of Committee: Dr. Monica Mendez In the last decades, the increase in population growth and differences in enforcement regulations on both sides of the Rio Grande may have affected the bacterial composition as a result of effluent discharges, industrial waste, raw sewage outfalls, and agricultural runoff. The purpose of this study was to compare structural differences in the microbial communities of the Rio Grande-Rio Bravo waters based on …

Examining The Relationship Between Anemia, Cognitive Function, And Socioeconomic Status In School-Aged Ecuadorian Children, Angela Chamberlain

Theses and Dissertations

Background and Objectives: It is estimated that over 40% of children in Ecuador are anemic. Anemia in children can influence physical and cognitive development and have lasting effects on adulthood productivity and quality of life. The objectives of this study were to: (1) evaluate the relationship of anemia and cognitive function, and (2) determine the influence of demographic factors on cognitive function. Population and Setting: The sample consisted of 175 school-aged children between 5 to 11 years old attending a school in a poverty stricken area of Guayaquil, Ecuador. Methods: A descriptive correlational cross sectional design was used to study …

The Amaranth (Amaranthus Hypochondriacus) Genome: Genome, Transcriptome And Physical Map Assembly, Jared William Clouse

Theses and Dissertations

Amaranthus hypochondriacus is an emerging pseudo-cereal native to the New World which has garnered increased attention in recent years due to its nutritional quality, in particular its seed protein, and more specifically its high levels of the essential amino acid lysine. It belongs to the Amaranthaceae family, is an ancient paleotetraploid that shows amphidiploid inheritance (2n=32), and has an estimated genome size of 466 Mb. Here we present a high-quality draft genome sequence of the grain amaranth A. hypochondriacus. The genome assembly consisted of 377 Mb in 3,518 scaffolds with an N50 of 371 kb. Repetitive element analysis predicted that …

Effectiveness Of A Parent Health Report In Increasing Fruit And Vegetable Consumption Among Preschoolers And Kindergarteners, Sanita Lisa Hunsaker

Theses and Dissertations

Patterns of fruit and vegetable consumption begin in childhood and persist into adulthood. Educating parents regarding appropriate dietary requirements for preschoolers is critical to supporting their appropriate growth and development. The purpose of this study was to determine whether a parent health report (including information about the child's fruit and vegetable consumption and recommendations regarding how to increase fruit and vegetable consumption) resulted in a greater fruit and vegetable intake in preschoolers and kindergarteners. Results from both the open trial and the randomized-controlled trial suggest that the parent health report may be a beneficial tool to increase vegetable consumption in …

The Antioxidant And Dna Repair Capacities Of Resveratrol, Piceatannol, And Pterostilbene, Justin Ryan Livingston

Theses and Dissertations

Lifestyle diseases represent a large burden on developed societies and account for much morbidity worldwide. Research has shown that eating a diet rich in fruit and vegetables helps to ameliorate and prevent some of these diseases. Antioxidants found in fruits and vegetables may provide a substantial benefit in reducing disease incidence. This thesis examines the antioxidant properties of resveratrol, piceatannol, and pterostilbene, and the ability of Burkitt's Lymphoma (Raji) cells to uptake these three antioxidants. It also studies the effect of the antioxidants in protecting against DNA damage and their role in DNA repair following oxygen radical exposure in Raji …

Cigarette Smoke Increases Cardiomyocyte Ceramide Accumulation And Inhibits Mitochondrial Respiration, Trevor Stanley Tippetts

Theses and Dissertations

Cigarette smoking is a common and lethal worldwide habit, with considerable mortality stemming from its deleterious effects on heart function. While current theories posit altered blood lipids and fibrinogen metabolism as likely mediators, none have explored the role of the sphingolipid ceramide in exacerbating heart function with smoke exposure. Ceramide production is a consequence of cigarette smoke in the lung, and considering ceramide's harmful effects on mitochondrial function, we sought to elucidate the role of ceramide in mediating smoke-induced altered heart mitochondrial respiration. Lung cells were exposed to cigarette smoke extract and heart cells were exposed to the lung-cell conditioned …

Development And Characterization Of Biodegradable Biorenewable Polymeric Nanocomposites For Food Packaging Applications, Samar Mohamed Ahmed Fadl

Theses and Dissertations

During the last 10 decades, plastic products have dominated humans’ lives with various applications in different fields, and particularly in food packaging industry. The fact that plastics do have numerous desirable characteristics does not conceal their detrimental effect on the environment and on human health. In order to overcome these problematic issues and to contribute to sustainable development in the future, other alternatives represented in employing biorenewable biodegradable polymers are implemented for plastics production. Poly (lactic acid) (PLA) is one of the most common employed biopolymer owing to its interesting characteristics. However, PLA exhibits poor mechanical and barrier properties. Natural …

Use Of Whey Protein Nanoparticles For The Encapsulation And Sustained Delivery Of Beta-Carotene And Zinc Micronutrient, Alshaimaa Salem

Theses and Dissertations

Nanoparticles prepared from whey protein isolates can be used for encapsulation and sustained delivery of β-carotene and zinc (II) ions. The loaded whey protein nanoparticles were prepared by the pH cycle method at aggregation pH 6 and 22 h ageing time in the presence of calcium ions. Morphology, particle size, stability and release profiles at neutral and acidic conditions of the loaded whey protein nanoparticles were evaluated. The results illustrated that whey protein nanoparticles were able to encapsulate β-carotene molecules in spherical compact structuresof around 400 nm that can protect sensitive β-carotene and limit its susceptibility to auto-oxidation reactions when …

Challenges Facing Women Living With Hiv In Upper Egypt, Ahmed Hussein Ali Abdeldaim

Theses and Dissertations

This research aims to identify challenges that face women living with HIV in Upper Egypt in order to help policy makers and different stakeholders to overcome those challenges. Interviews with women living with HIV from different governorates in Upper Egypt were conducted. In addition, this research included interviews with national AIDS program officials and NGOs managers to obtain different perspectives about the condition of women living with HIV. Women represent half of people living with HIV around the world. The burden of disease on women is even more challenging in many countries due to gender inequality. The effect of culture …

Determination Of Phthalate Esters In Egyptian Pet-Bottled Water Investigated Under Different Storage Conditions, Ghada Ismail Zaki

Theses and Dissertations

Phthalate esters are organic compounds that are extensively used in polymers manufacturing and many commercial products and can induce serious adverse health effects upon human exposure. The migration of phthalates esters from PET plastic bottles into water especially under poor storage conditions is subject to scientific debate. This study is the first to assess the occurrence of six phthalates in different branded PET bottled water locally produced in the Egyptian market. The samples were analyzed using liquid-liquid extraction with dichloromethane and GC/MS under various storage conditions. Among the six analyzed phthalates, three were detected at sub ppb levels where DEHP …

Fabrication Of Garlic Composites Nano-Biotics And Investigating Their Anti-Bacterial Activities, Sherif Ashraf Saad Fahmy

Theses and Dissertations

Bacterial infections are considered the second main cause of death worldwide and the third main cause of death in the developed countries and as a result, many antibacterial coatings have been prepared in order to fight the different strains of bacteria and decrease the mortality rates. Natural antibacterial products become of great interest nowadays and their use is preferred over the synthetic products in order to overcome the resistance to the synthetic antibiotics. A wide variety of antibacterial coatings have been developed ranging from polymeric to polymer Nano-composites (PNCs) materials. Using nanomaterials as fillers within polymer matrices have been reported …

The Effects Of Marital Attachment And Family-Of-Origin Stressors On Body Mass Index, Merle Natasha Bates

Theses and Dissertations

The purpose of this study was to examine the moderating effect of couple's attachment behavior on family-of-origin (FOO) issues and body mass index (BMI). Previous research has indicated that family and couple relational factors may influence BMI. The vulnerability and stress model provided a theoretical framework for understanding how attachment behaviors may give greater adaptability to managing vulnerabilities from family stress. 1214 couples between the ages of 18 and 70, who identified themselves as in a serious relationship were surveyed using the RELATE questionnaire; both partners responded. Results indicated that there was a significant association between FOO stress and adult …

Silencing Of The Oshp Gene For Increasing Abiotic Stress Tolerance In Rice, Virginia Ann Boyett

Theses and Dissertations

This thesis project involves increasing the tolerance to abiotic stresses in rice through silencing the OsHP gene, a homolog of Arabidopsis AtClb, which has been identified as a negative regulator of response to abiotic stresses. A fragment of the OsHP gene was cloned into a Gateway entry vector pENTR/D-TOPO, and a silencing construct was created with the Gateway destination vector pANDA through an LR clonase reaction. Embryogenic callus tissue was generated from seed of the rice cultivars `Nipponbare' and `LaGrue'. Biolistic and Agrobacterium-mediated transformation procedures were used to transfer the pANDA_OsHP silencing construct into the rice callus tissue. Transformed calli …