Digital Commons Network^™

Integrative Taxonomy Of North American Torrent Mites (Parasitengona: Torrenticolidae: Torrenticola), Jon Ray Fisher

Graduate Theses and Dissertations

Mites are notorious for being under-studied and incomplete knowledge of distribution, life-history, and morphology are commonplace. They typically gain attention through the relatively few pest species that plague our crops, pets, or bodies. Despite representing a successful radiation with an estimated 3–5 million species, relatively few mite lineages attract research attention from non-acarologists. However, the largest radiation of all mites—Parasitengona—has potential to bridge the gap between specialists and non-specialists. Parasitengona are the butterflies of the mite world. Obvious are the bright red mites searching for pollen on concrete, or the large, furry velvet mites coming out to mate after spring …

Instructional Methods And Engagement: The Impact Of Gamification On Student Learning Of Apa Style, Joyce Elaine Terrell

Graduate Theses and Dissertations

This research examined the effects of simple gamification on the instructional skill outcome and level of engagement as measured by time, repetitions, and responses to the Cognitive Absorption, Perceived Ease of Use and Perceived Usefulness Scale (Saadé and Bahli, 2005). Participants were 70 graduate and undergraduate students randomly assigned to one of two instructional conditions: gamified or typical online instruction. Instruction consisted of three modules on the use of APA 6th ed. (American Psychological Association) citation and reference style in college level writing. Both groups received the same instruction but with different context and directions. Participants in the typical condition …

How The University Of Arkansas’ Change In Conference Affiliation Set Off Realignment In Intercollegiate Athletics, Matthew Jones

Graduate Theses and Dissertations

The era of realignment within the conferences that make up the largest football-playing division of the National Collegiate Athletic Association can be traced to one event.

In the 1984 Supreme Court case NCAA v. Board of Regents, the court ruled the NCAA had violated antitrust laws by not allowing individual colleges to negotiate their own TV contracts for football games. The decision nulled and voided existing TV contracts with the NCAA, allowing a free market for colleges. Many programs partnered with the College Football Association to negotiate TV contracts in the 1980s and early ‘90s.

Five years after the Supreme …

Growth And Productivity Of Irrigated Rice (Oryza Sativa L.) For A Tropical High Altitude Environment In Rwanda, Elie Rene Gasore

Graduate Theses and Dissertations

Yield components, grain yield, biomass and plant N accumulation, and N fertilizer responses of irrigated rice (Oryza sativa, L.) were evaluated for a tropical inland valley environment in the high altitudes in Rwanda. Effects were measured for nitrogen (N) fertilizer rate (0, 60, 90,120,150,180 kg N ha-1), season, growth stage and cultivar of different subspecies and plant types during 2012 dry season (DS) and 2013 wet season (WS) at Cyili Rice Research Farm (1380 m above sea level). Variations in irradiance (17.2± 0.32 MJ m-2 day-1 in DS and 9.4 ± 0.66 MJ m-2 day-1in WS) were linked to seasonal …

Selling College: Student Recruitment And Education Reform Rhetoric In The Age Of Privatization, Paige Marie Hermansen

Graduate Theses and Dissertations

This dissertation explores the success of for-profit colleges and universities (FPCUs) as a socio-cultural phenomenon that hinges on distinct public discursive strains and neoliberal rhetorics. This project examines the role of language in creating and sustaining particular discourses of higher education and how those discourses are reinforced and reflected in channels of discourse like documentary films and advertisements.

In the context of shifting demands on and representations of higher education, this project critiques the evolving rhetoric of American education and the shift toward a wider acceptance of privatization efforts, as well as the effect this shift has had on prospective …

A Molecular Approach To Understanding The Effects Of Original-Xpc On The Modulation Of The Cecal Microbiota And The Survival Of Salmonella In The Poultry Host, Stephanie Roto

Graduate Theses and Dissertations

Salmonella is a foodborne pathogen commonly associated with poultry products; the economic burden to the U.S. is estimated to be approximately $693 million (without factoring in contaminated eggs). Recently, there has been pressure to withdraw sub-therapeutic levels of antibiotics (also known as antibiotic growth promoters; AGP) from poultry due to concern over antibiotic-resistant bacteria spreading to the human population. Therefore, various feed additives have been researched for their ability in providing protection against harmful pathogens and their potential growth promoting effects, both of which were attributes of poultry treated with AGP. This thesis consists of a comprehensive literature review that …

The Role Of Child Anxiety In Parent Sick Role Reinforcement, Sarah Ann Bilsky

Graduate Theses and Dissertations

A large body of evidence suggests that parents can facilitate offspring anxiety in response to bodily arousal. These learning experiences are referred to as “sick role reinforcement,” and are particularly important during adolescence, given the profound bodily changes (e.g., puberty) that characterize this period. Sick role reinforcement is likely important in the context of panic disorder (PD). Panic theorists suggest that parents may enhance panic vulnerability by increasing the threat value of bodily sensations. Although a sizeable body of work has examined the role of parent behavior in these processes, few have examined offspring factors in this process. Additionally, little …

Cooling Effectiveness Of Modified Cold-Water Immersion Method Following Exercise-Induced Hyperthermia, Katherine Elizabeth Luhring

Graduate Theses and Dissertations

Context: Recommended treatment of exertional heat stroke (EHS) includes whole body cold-water immersion (CWI); however, remote locations, spatial or monetary restrictions challenge CWI feasibility. Thus, the development of a modified, portable CWI method would allow for optimal treatment of EHS when restrictions apply. Objective: Determine cooling efficacy of modified CWI (tarp assisted cooling with oscillation; TACO) following exertional hyperthermia. Design: Randomized, crossover controlled trial. Setting: Environmental chamber (33.4 ± 0.8°C, 55.7 ± 1.9% relative humidity). Patients or Other Participants: Sixteen (9 males, 7 females) volunteers (26 ± 4.7y, 1.76 ± 0.09m, 72.5 ± 9.0kg, 20.7 ± 7.1%body fat) with no …

Literature As Virtual Reality: An Exploration Of Subjectivity Formation In The Digital Era, Jessica Danielle Schnebelen

Graduate Theses and Dissertations

This project traces a line of developing subjectivity in the history of mediation. Using Jacque Lacan’s mirror stage to emphasize the relationship between Social identification and self formation, I suggest literary virtual realities further our understanding of human-technology relationships. Examining the evolution of eighteenth and nineteenth century sympathetic consciousness reveals a subjectivity intricately bound to both cognitive and physical spaces. The emergence of the virtual body complicates this consciousness by obscuring physicality and mixing man and machine. To trace this consciousness this project looks at the work of Jane Austen, Virginia Woolf, and a contemporary television writer, Charlie Brooker. These …

Investigation Of The Inherent Chemical, Structural, And Mechanical Attributes Of Bio-Engineered Composites Found In Nature: Alligator Gar’S Exoskeleton Fish Scales, Wayne Derald Hodo

Graduate Theses and Dissertations

The U.S. Army has determined a huge cost savings of up to 51% can be accomplished by reducing the gross vehicle weight, for their personnel carrier, by 33%. To cut cost, composite materials are needed. Man-made composites can have superior material properties (high-strength, high-fracture toughness, and lightweight), but they are prone to delamination at the glued-layered interface. In contrast, fish scale is a natural composite that has the same material properties and, additionally, tend not to delaminate.

The focus of this study was to learn how nature integrates hard and soft materials at each length scale to form a layered …

The Role Of G-Protein Signaling In Pathogenesis In Cercospora Zeae-Maydis, Brant Smith

Graduate Theses and Dissertations

Gray leaf spot, caused by Cercospora zeae-maydis, is one of the most destructive foliar diseases of maize worldwide. C. zeae-maydis orients hyphal growth towards stomata (stomatal tropism) and forms infectious structures (appressoria) that are necessary for successful infection. Although some genes involved in pathogenesis in C. zeae-maydis have been identified, the molecular mechanisms are not well understood. In fungi, heterotrimeric G-proteins consist of three subunits (α, β, and γ) and mediate responses to environmental stimuli. They regulate diverse functions, including nutrient detection, virulence, fungal development, conidiation, secondary metabolism, and pathogenesis in many plant pathogenic fungi. This research explored the role …

Optimizing A Luciferase-Based Tool For Studying The Effects Of Fatty Acid Desaturase 7 On Singlet Oxygen Accumulation In Arabidopsis Thaliana, Abeer Muhammedali Alnasrawi

Graduate Theses and Dissertations

In plants, reactive oxygen species (ROS) are generated as a byproduct of normal metabolism, as well as in response to adverse conditions such as light stress, extreme temperatures, and exposure to pests and pathogens. Singlet oxygen (1O2) is a ROS that is formed during photosynthesis in photosystem II (PSII) of the chloroplasts. Levels of 1O2 and other ROS are tightly controlled in healthy plants, but some studies suggest that levels of fatty acid desaturase (FAD) activity in Arabidopsis thaliana can influence constitutive and/or stress-responsive ROS accumulation. In this study, a luciferase-based reporter gene that is selectively stimulated by 1O2 (AAA-ATPase: …

Examining Employability As Associated With Ic3, Mos, And Aca Certifications, Kelley Leigh Todd

Graduate Theses and Dissertations

Forrier and Sels (2003) define employability as “an individual’s chance of a job on the internal and/or external labor market” (p. 106) and is important (Wittekind, Raeder, & Grote, 2010). Possessing an industry certification may be considered an example of human capital skill. The human capital theory suggests qualifications, knowledge, skills, and experience of individuals may lead to increased earnings or productivity (Becker, 1993; Rosen, 1987; Schultz, 1971). As such, the human capital theory provides a framework for studying perceived employability (Wittekind, Raeder, & Grote, 2010; Verhaar & Smulders, 1999) as associated with IC3, MOS, and ACA industry certifications.

Randall …

The Relationship Between Pre-Service Teachers’ Basic Technology Competence, Technology Self-Efficacy And Perceptions Of Adopting Educational Applications On Ipads For Classroom Use, Rebecca Ann Martindale

Graduate Theses and Dissertations

iPads and tablets are the latest technological tools that schools are adopting for classroom use. Yet, according to the Teacher’s Use of Educational Technology in U.S. Public Schools: 2009 Report, 25-50% of the teacher population surveyed report rarely or never using basic classroom technologies (LCD projectors, whiteboards, document cameras and computers) for teaching (Gray, Thomas, & Lewis, 2010). A modified Perceived Characteristics of Innovating (PCI) instrument originally developed by Moore & Benbasat (1991) was used to determine intention to integrate educational applications on iPads for classroom use. Multiple regression analysis was conducted to determine whether technology competence or technology self-efficacy …

Does A Positive Male Role Model Affect The Achievement Of Adolescent African-American Males? A Case Study, Elphin Maxwell Smith Jr.

Graduate Theses and Dissertations

African-American males are at risk. A continuous cycle of low academic achievement, low academic attainment, and high incarceration rates threaten to end the lives of many of these young men one way or another. There are many challenges faced by African-American men that have caused economic opportunities to evade these young men. The concern is whether families, educators, and communities can help every African-American male achieve at a higher level in order to participate in better economic opportunities. This qualitative case study is designed to help families, educators, and community leaders understand and help African-American males achieve academically, close the …

Reduction Of Campylobacter Jejuni On Chicken Wingettes By Treatment With Caprylic Acid, Chitosan Or Protective Cultures Of Lactobacillus Spp., Ann Nicole Woo-Ming

Graduate Theses and Dissertations

Poultry is one of the main sources of protein in the United States and in 2014 Americans ate approximately 100 lbs per person. However, consumption of poultry products is strongly associated with foodborne illness from Campylobacter. In the first study, chitosan, caprylic acid and their combination were evaluated as a coating treatment for the reduction of Campylobacter jejuni on poultry products. For the initial screening trials, chitosan of three different molecular weights (15-50 kDa, 190-310 kDa and 400-600 kDa) was evaluated at three concentrations (0.5%, 1.0%, 2.0%) and separately, caprylic acid was tested at 0.5%, 1.0% and 2.0% using chicken …

Modulation Of Valve Interstitial Cell Function Through Cell Shape And Phenotype, Atefeh Razavi

Graduate Theses and Dissertations

The aortic valve is a highly dynamic structure responding to actively to the chemical, mechanical and physical cues of the valve microenvironment. Valve interstitial cells are dispersed throughout the valve tissue and play an important role in maintaining the integrity and optimum function of the valve. They are a heterogeneous population composed of various phenotype. These phenotypes have specific functions characteristic of valve physiological and pathological conditions. The effect of mechanical loading and chemical modulators on the behavior of the valve interstitial cells have largely been studied. However the role of valve interstitial cell shape as an intrinsic physical cue …

Influence Of Shelling Temperature And Time On The Optical And Structural Properties Of Cuins2/Zns Quantum Dots, Colette Robinson

Graduate Theses and Dissertations

CIS/ZnS core/shell QDs are an important class of nanomaterials for optoelectronic, photovoltaic and photoluminescence applications. They consist of lower toxicity materials than the prototypical II-VI Cd-based QDs and show long fluorescence lifetimes, which generates prospective in biological imaging applications. It is vital to develop reproducible synthetic methods for this new class of nanomaterials in order to maintain small sizes with high QYs. CIS core QDs have been shelled with ZnS at various temperatures from 90-210°C for reaction times ranging from 20-140 minutes to examine the role of thermodynamics and kinetics on the shell growth. Using HR-TEM and ICP-MS, it was …

Essays On Technology-Mediated Training: Implications For Design And Evaluation, Vishal Satyapal Shah

Graduate Theses and Dissertations

Information technology (IT) is increasingly used to impart a variety training skills, and these skills may range from specific software application operations and computer programming to learning about generic business processes. Using IT to assist training is broadly termed “Technology-Mediated Learning” (TML). Following the three essay model, this dissertation examines training interventions in the context of TML. In Essay 1, a thorough literature survey of technology training in Information Systems (IS) was conducted, resulting in clarification of the nomenclature used in TML. Essay 1 also identified of two leading theories used in TML research: (a) Social cognitive theory (SCT) (b) …

Rupture In Abdominal Aortic Aneurysm, Qusay Alfaori

Graduate Theses and Dissertations

Quantification of abdominal aortic aneurysm development, its growth kinetics, and rupture criteria are important to decrease the risk of this life-threatening event. Uniaxial testing of healthy and collagen degraded aortic specimens from pigs was performed. A mathematical model, from the literature, for the stress-strain relationship that is suitable for describing the behavior of abdominal aortic tissue was used to derive specific tissue properties/parameters as a function of strain rate and as a function of specimen orientation. Analyses consisting of Finite Element Modeling of healthy and collagen degraded abdominal aortas were performed using ABAQUS finite element code and the measured properties. …

Leptin Regulates The Expression Of Autophagy-Related Genes In Chickens, Peter Olawale Ishola

Graduate Theses and Dissertations

Autophagy or cellular self-digestion, a lysosomal degradation pathway that is conserved from yeast to human, plays a key role in recycling cellular constituents, including damaged organelles. It also plays a pivotal role in the adaptation of cells to a plethora of distinct stressors including starvation. Autophagy has been extensively studied in mammals and yeast, but little is known in avian species. Thus, the major objective of the present study was to determine the effects of leptin on autophagy-related genes in chicken hypothalamus, muscle and liver. Leptin is an adipocytokine that is mostly produced by white adipose cells in mammals (as …

Stink Bugs: Spatial Distribution, Pecan Phenological Susceptibility And Sampling Program, Brian Cowell

Graduate Theses and Dissertations

An effective management program for stink bugs (SBs) in pecan groves requires knowledge of: stages of the pecans susceptible to SB damage; strata of the tree with SB damaged nuts; a practical SB monitoring method; and, effects of landscapes contributing SBs into pecan groves.

Stink bugs produced feeding punctures in pecan shucks at all phenological stages. Pecans punctured before the dough stage drop from the tree. Kernel damage occurs in the pecans’ dough stage, whereas mature pecans are not damaged.

The pecans collected from the whole tree using the tree shaker had significantly less punctures than the pecans collected from …

A Comparison Of Athletic Identity And Career Maturity Of Female Student-Athletes At Different Levels Of Competition, Simeon Hinsey

Graduate Theses and Dissertations

This study explored the relationship between the athletic identity and career maturity of women’s basketball student-athletes. Differences in athletic identity and career maturity were also investigated based on a women’s basketball student-athlete’s level of competition, race, year in school, socioeconomic status, and professional athletic career aspirations. In order to examine the relationship between these variables, a convenience sample of 209 women’s basketball student-athletes from NCAA Division I (n = 62), NCAA Division II (n = 40), NCAA Division III (n = 50), and NAIA (n = 57) institutions located in the southeastern region of the United States participated in the …

A Descriptive Case Study Of Individuals With Presumed Ocular Histoplasmosis Syndrome Utilizing A Facebook Support Group, Lisa Aimee Thompson

Graduate Theses and Dissertations

This dissertation describes the experiences of people diagnosed with presumed ocular histoplasmosis syndrome as they participate in an online peer-support group on Facebook. This is a descriptive case study of factors related to adjustment, treatment, emotional distress, access to services, and online peer support. Participants were interviewed and observed, and documents were collected to describe this phenomenon.

Broiler Breeder Mating Behavior And The Effects Of Pre-Incubation Embryo Integrity Modifications On Broiler Performance, Emily Kathryn Lhamon

Graduate Theses and Dissertations

Modern broiler breeders have been observed displaying significantly less mating behaviors than their ancestral fowl. Effective mating behavior translates into fertile hatching eggs that ultimately become broilers processed for market. The poultry industry has made significant changes in genetics, environment, housing, and diets of commercial poultry. However, there are some concessions made in genetic selection and streamlined management to produce larger, fast-growing, efficient birds. Aggression in broiler breeder males is believed to be a sign of high fertility. However, highly aggressive males pose a threat to the welfare of their flock mates, and may also impede frequency of mating and …

Response Of Bacterial Cells To Fluctuating Environment, Sudip Nepal

Graduate Theses and Dissertations

We have studied morphological and genomic variations occurring in a mesophilic bacterium Escherichia coli (E. coli) in a wide range of continuous and fluctuating hydrostatic pressures. For all the studies here the temperature is maintained at 37◦C, the optimal growth tem- perature of E. coli at atmospheric pressure. Cell division is inhibited at high hydrostatic pressures resulting in an increase of cell length. The increase of cell-length depends on the extent and duration of the stress applied on bacterial cells. We have studied the effect of high pressure stress in three different conditions – (i) Wild-type cells (almost no genetic …

Microbial Safety, Shelf Life Stability, Quality Preservation, And Consumer Acceptance Of Vacuum-Infused, Irradiated Chicken Breast Meat Treated With Natural Plant Extracts And Organic Acids, Kenneth Franklin Over

Graduate Theses and Dissertations

Contamination of poultry products with food borne pathogens is a consistently recurring problem in the United States and the world. Recalls associated with chicken contamination are responsible for considerable economic losses to the poultry industry. Many decontamination steps are currently in place to reduce the likelihood of contaminated products reaching the consumer, but despite these safeguards, contamination events are still uncomfortably frequent. Irradiation is a safe and effective means of ensuring the safety of both ready-to-cook and ready-to-eat poultry but is not utilized in the United States. This is due, in part, to certain irradiation dose-dependent quality characteristic defects associated …

Sampling Terrestrial Arthropod Biodiversity: A Case Study In Arkansas, Michael Joseph Skvarla

Graduate Theses and Dissertations

The Interior Highlands is a biodiversity hotspot, with at least 200 known endemic species, but is understudied compared to hotspots, such as the Southern Appalachians. In order to begin to rectify this issue, a nine month study was conducted from mid-March through early December at a 4 ha site at Steel Creek, Buffalo National River, in Newton County, Arkansas. Thirteen collecting methods were employed, including three colors of Lindgren funnel trap, five colors of pan trap, Malaise traps, canopy traps with upper and lower collectors, pitfall traps, and Berlese-Tullgren extraction of leaf litter, which resulted in the collection of 1311 …

Prediction Of Rupture In Abdominal Aortic Aneurysm, Qusay Alfaori

Graduate Theses and Dissertations

Studying the development of abdominal aortic aneurysm (AAA) through quantification of its growth kinetics and rupture criteria is important to decrease the risk of this life-threatening event. Uniaxial and biaxial testing of healthy and time-dependent Type-I collagen degraded aortic specimens from pigs was performed. Stress-strain suitable mathematical models describing the behavior of abdominal aortic tissue were utilized to derive specific tissue properties and parameters. Reduction in Type-I collagen fraction was observed using picrosirius red staining method, bright field microscopy, and MATLAB. Finite Element Modeling (FEM) of healthy and time-dependent Type-I collagen degraded abdominal aortas were performed using ABAQUS finite element …

Portion Size Communication By Means Of Package Design, Tami J. Strickland

Graduate Theses and Dissertations

This qualitative study assessed consumers’ current methods of determining portion sizing of chicken products and examined their perceptions of how effectively three package designs communicate portion size. Everett M. Rogers’ Diffusion of Innovations (DI) Theory analyzes the characteristics of the consumer of the innovation (adopter) and the impact these characteristics have on adopting new innovations. The innovation in this study will be the prototype packaging. Focusing on Rogers’ adopter characteristics and defined proprietary consumer segmentation characteristics, this study will be pivotal for future package design projects targeting nutrition education.

Focus group questions were scrutinized through a pilot study and revised …