Digital Commons Network^™

Evaluation Of Fresh-Market Potential Of Arkansas-Grown Fruit: Blackberries, Peaches, Table Grapes, And Muscadine Grapes, Molly Felts

Graduate Theses and Dissertations

Fresh-market produce is a major component of commercial market sales. However, shelf-life of fresh-market produce is limited, so evaluating postharvest potential (time from harvest to consumption) is critical. Fresh-market fruit can be impacted by many factors that deteriorate the quality of the fruit. Understanding the postharvest physiology of fruit can lead to better handling and storage conditions for extended shelf life and enhanced quality for the consumer. This research project was a collaborative effort within the University of Arkansas System Division of Agriculture between the Food Science and Horticulture Departments to evaluate the fresh-market potential of Arkansas-grown fruit. Physiochemical and …

In Vivo Structure-Function Analysis Of Drosophila Robo1, An Axon Guidance Receptor Critical For Midline Repulsive Signaling In The Embryonic Central Nervous System, Haley Brown

Graduate Theses and Dissertations

The repellant ligand Slit and its Roundabout (Robo) family receptors regulate many aspects of axon guidance in bilaterians, including midline crossing of axons during development of the embryonic CNS. Slit proteins are produced by midline cells and signal through Robo receptors expressed on the surface of axonal growth cones to repel axons from the midline. Disruption of Slit-Robo signaling causes ectopic midline crossing phenotypes in the CNS of a broad range of animals, including insects and vertebrates.

Drosophila Robo1 has a conserved ectodomain structure of five immunoglobulin-like (Ig) domains plus three fibronectin (FN) repeats. By utilizing a genomic rescue construct …

Investigation Of Nanomaterial Based Photovoltaic Panel Packaging Materials, Xingeng Yang

Graduate Theses and Dissertations

In this research, nanomaterial-based packaging materials for photovoltaic (PV) panels are investigated. A hydrophobic/anti-reflective surface coating which not only repels water from the top glass of a PV panel but at the same time reduces its light reflectance is investigated. COMSOL simulation results indicate that taller ellipsoid rod (aspect ratio = 5) reflects less light than shorter rod (aspect ratio = 0.5) in the desired spectrum for solar energy harvest from 400nm-700nm. The addition of a polymer layer on these ellipsoid rods broadens the light incident angle from 23° to 34°, from which light can be efficiently absorbed. Based on …

The Comparison Of Using The Preferred Or Non-Preferred Wrist When Measuring Physical Activity In College Students, Bryce Daniels

Graduate Theses and Dissertations

Introduction. People who participate in regular physical activity have a decreased risk of chronic diseases and premature death. A dramatic decrease of physical activity occurs from adolescence to young adulthood. With important implications to health, physical activity is an important behavior to measure. However, inconsistencies exist on how to measure physical activity. When using accelerometers, differences between the preferred or non-preferred wrist may result in different estimates of physical activity. Purpose. The purpose of this study was to compare the preferred and non-preferred wrist accelerometry measured physical activity using commonly used research accelerometers during structured daily college activities (Actigraph GT3x-bt …

Disordered Eating Risk And Body Image Dissatisfaction Of Division I Male And Female Cheerleaders, Christopher Blaszka

Graduate Theses and Dissertations

The sport of cheerleading is growing both in the high school and college setting, however there is little research on cheerleaders specifically, both sideline and competitive. It is clear that while this sport does not benefit from being affiliated with the NCAA, the athletes are still at large risk for disordered eating and eating disorders, and are in need of more accurate screening and prevention methods. With the lack of cheerleading studies in general, there is an even larger scarcity of studies that focus on males in cheerleading. The current study aims to fill the gap in the research regarding …

How College Campuses Are Using Social Media During Severe Weather Events, Emmale Davis

Graduate Theses and Dissertations

This study explores how college campuses are using social media during severe weather events. This topic surfaced after a tornado devastated Moore, Oklahoma in May 2013 and those displaced flocked to the University of Oklahoma campus after a post made on Twitter went viral prior to an official message being sent out by the university. In order to further explore this topic, a qualitative phenomenological case study was conducted at the following sites: University of Alabama, Missouri Southern State University, University of Oklahoma, and Florida State University. This study included observations of social media posts on Facebook and Twitter on …

Gis Modeling Of The Prominent Geohazards In Arkansas, Kyle Walker Rowden

Graduate Theses and Dissertations

The State of Arkansas is prone to numerous geohazards. This thesis is a twofold study of prominent geohazards in Arkansas: the first fold includes a novel triggerless approach for mass wasting susceptibility modeling applied to the Boston Mountains in NW Arkansas, and the second fold is a GIS-based regression modeling of the extreme weather patterns at the state level. Each study fold is presented in this thesis as a separate chapter embracing a published peer-reviewed paper. In the first paper, I have used the analytical hierarchy process to assign preliminary statistical weights to the most cogent variables influencing mass wasting …

Jarfly, Zachary Harrod

Graduate Theses and Dissertations

To look, through poetry, at the men my culture has produced. Formal decisions are unique to each poem which are arranged sonnets, couplets, quatrains, among other forms and free verse forms. Toxic masculinity is examined, as well as the people enabled, participating in, and victimized by that culture.

Computational Fluid Dynamics Model For Air Velocity Through A Poultry Transport Trailer In A Holding Shed, Christian Heymsfield

Graduate Theses and Dissertations

Broiler production in Arkansas was valued at over $3.6 billion in 2013 (University of Arkansas Division of Agriculture Cooperative Extension Service). Consequently, improvement in any phase of the production process can have significant economic impact and animal welfare implications. One area of concern for the poultry industry is thermal stress experienced by the birds after arrival at the processing plant and before they are taken in to be processed, during which time they are left to wait in holding sheds. Various cooling strategies exist to mitigate heat stress in holding sheds, but in most cases it is unlikely that they …

Counselors' Self-Discrepancy And Its Impact On Their Burnout And Wellness, Donghun Lee

Graduate Theses and Dissertations

This study explores the relationships between counselors’ professional, personal, and reflected selves as well as between counselors’ self-discrepancies and their burnout and wellness. Moreover, an investigation on the impacts of counselors’ self-discrepancies on their burnout and wellness as a professional was conducted. The use of self has been emphasized in order for counselors to elicit meaningful outcome with clients. To demonstrate the use of self as an instrument of the counseling process, integrating professional, personal, and reflected selves is necessary for counselors. One hundred ninety five (N = 195) professional counselors in Mid-South States, who currently practice, supervise, educate, or …

Geography Of The Middle East Through The Western Lens: A Survey Of Films Set In The Middle East And Filmed In The American Southwest, Jake Bryan Rowlett

Graduate Theses and Dissertations

Representation of cinematic geography is a struggle in the world of film: a power balance between the work of the filmmakers and the place itself. Often, the filmmakers tip the scales in their favor and the true nature of the place is lost in translation. Throughout the history of cinema, the geography of the Middle East has been manipulated into a vision designed for Western audiences that is strikingly disjointed from reality.

The foundation of modern Orientalist interpretations of the Middle East in film can be seen in the early decades of the film industry, through the “Biblical Epic,” and …

Defending Wild Dogs: Population Dynamics And Disease In Endangered African Wild Dogs, Elizabeth Claire Arredondo

Graduate Theses and Dissertations

African wild dogs (Lycaon pictus) are endangered carnivores whose population is decreasing from habitat loss and fragmentation, interspecific competition, and disease. Survival rates are especially low in Kruger National Park (KNP), though it is unclear why. I estimated the abundance in KNP and survival rates over different time spans, six years and nine months, using public photographic survey data. In 2015, there were 298 (SE=12.1) individuals. Using a mark-recapture analysis in program R, I found that the survival rate between 2009-2015 was only 3.2%, and within the 9-month survey period (September 2014 – June 2015), monthly survival rates for the …

An Investigation Into The Suitability Of Sulfate-Reducing Bacteria As Models For Martian Forward Contamination, Maxwell M. W. Silver

Graduate Theses and Dissertations

The NASA Planetary Protection policy requires interplanetary space missions do not compromise the target body for a current or future scientific investigation and do not pose an unacceptable risk to Earth, including biologic materials. Robotic missions to Mars pose a risk to planetary protection in the forms of forward and reverse contamination. To reduce these risks, a firm understanding of microbial response to Mars conditions is required. Sulfate-reducing bacteria are prime candidates for potential forward contamination on Mars. Understanding the potential for forward-contamination of sulfate-reducers on Mars calls for the characterization of sulfate-reducers under Mars atmosphere, temperature, and sulfate-brines. This …

Takin' Care Of Business, Cody Levi Shelton

Graduate Theses and Dissertations

This thesis consists of my statement of artistry, and documentation of artistic materials and thesis related performances.

Microbiome Of Commercial Broilers Through Evisceration And Immersion Chilling, John A. Handley

Graduate Theses and Dissertations

The United States poultry industry generated 38.6 billion pounds (17,500 metric ton) of meat in 2014 which averaged to 121 pounds (55 kg) per individual of the U.S that same year. Of that meat generated by the poultry industry, an estimated 1 million cases of Salmonellosis will occur. Out of the 1 million cases approximately 40, 000 to 50,000 will be confirmed cases by the CDC. Recently, the USDA has requested changes in the inspection process and are currently allowing processors more freedom to utilize innovation to drive the increase in safer and more desirable foods. The new standards set …

Involvement Of The Ino80 Complex In Chromosome Segregation, Jesus Moreno

Graduate Theses and Dissertations

Chromatin remodeling complexes are multi-protein complexes that regulate the dynamics of the nucleosomes in the genome. The INO80 chromatin remodeling complex participates in varied biological processes such as: transcription, DNA repair, DNA replication and chromosome integrity. It catalyzes the eviction of the H2A.Z variant histone as well as whole nucleosome eviction. This complex is comprised of 15 subunits and the contribution of each to chromosome segregations remains unknown. To evaluate the contribution of each subunit to chromosome segregation, we tested deletion mutants of the non-essential subunits for DNA content and benomyl sensitivity. Also, we assessed members of the SWR1 and …

The Myth Of Southern Atonement: Constructed Forgiveness In Public Spaces, Elizabeth Ashley Clayborn

Graduate Theses and Dissertations

This thesis provides a rhetorical analysis of public space in Arkansas and examines the ways in which the myth of Southern Atonement is constructed within those spaces. Three formal elements characterize Southern Atonement: absolution from the past, distinctiveness in constructed authenticity, and hope for a post-racial future. The analysis develops over three case studies which I argue contribute to the construction, engagement, and actualization of this cultural myth. The first chapter looks at Fort Smith, Arkansas, and The Unexpected art project as a source of identity construction and place attachment. Then I examine The Billgrimage, or the monuments and museums …

Multiscale Investigation Of The Behavior Of Heart Valve Interstitial Cells In Response To Pathological Shape And Mechanical Stimulation, Ngoc Thien Lam

Graduate Theses and Dissertations

Our works aim to provide an insight into how aortic valve interstitial cells (VICs) respond to pathological shape and mechanical stimulation as well as the potential signaling pathway that mediates these responses, using a multiscale approach. A single cell model was developed to investigate the effect of altered shape on valve cell function as valve cells were reported to significantly deform during the cardiac cycle. Single VICs were controlled to take on features with different width-to-length aspect ratios that corresponded to the steady-state shapes adopted by VICs when stretched to 0%, 10% and 20%, respectively. It appeared that single VIC …

Palestinian Labor In West Bank Settlements, Ethan Morton-Jerome

Graduate Theses and Dissertations

Since the late 1970s, Palestinians have worked in West Bank settlements, with approximately 30,000 to 40,000 Palestinians currently employed in construction, factories in industrial zones, and plantations. My analysis of Palestinian labor on the settlements begins with the historical, political, legal, and economic context of Palestinian labor in three jurisdictions: in Israel, on the settlements in the West Bank, and in PA-controlled Area A. Fundamental to the analysis is to go beyond the restrictions of nationalist discourse to recognize both intranational tensions and that labor exploitation occurs in all jurisdictions. My fieldwork and analysis were conducted over three years (2013-2016) …

Self-Perception Of Ncaa Division I Student-Athletes, Sean Strehlow

Graduate Theses and Dissertations

Self-perception is the level of competency at which individuals evaluate themselves in certain areas or domains (Marsh & Shavelson, 1985). An individual’s self-perceptions contribute to their global self-worth, and even predict performance (Cuellar, 2014; Harter & Neemann, 2012). Self-perception is an increasingly popular area of study, and there is a gap in the research as it pertains to college student-athletes (Harter & Neemann, 2012). This study measures self- perception scores, as well as experiences with racial discrimination, of 306 NCAA Division I student-athletes using the Self-Perception Profile for College Students (Harter & Neemann, 2012). Scores are compared across race/ethnicity and …

Gothic Voids: Nineteenth-Century Reader Experience And Participation, Garrett Chapman Jeter

Graduate Theses and Dissertations

Characterization of nineteenth-century literary Gothic is usually confined to affective response. This project argues that literary Gothic works constitute an intellectual, empirical endeavor. Because authors of literary Gothic intentionally left voids in their narratives, they invited their readers to participate in making narrative through speculation and conjecture about missing information. The practice of Gothic reading makes the reader an active partaker in filling those voids with rational conclusions. Reading is not just textual encounter. Rather, it incorporates making meaning of one’s surroundings. In their experiences, literary works’ characters “read” their environments: people, objects, events, etc. Chapter 1 characterizes Gothic reading …

Teacher And Administrator Perceptions Of The Teacher Excellence And Support System (Tess) In Arkansas, Allison Louise Byford

Graduate Theses and Dissertations

The purpose of this study was to investigate differences in Arkansas teachers’ and building-level administrators’ perceptions regarding the purpose of the Arkansas TESS teacher evaluation system, whether TESS authentically assesses teacher effectiveness, how teacher evaluation data are used, and how the TESS process supports learner-centered professional development. Additionally, the relationship of teacher and administrator demographics on their perceptions of TESS was explored. The results of this study highlight the differences in perceptions in all areas questioned along with misalignment in perceptions among teachers. Overall, the study points toward the need for clear communication and the cultivation of relationships among building …

A Case Study Of The Umpqua Community College Shooting, Timothy P. Wilson

Graduate Theses and Dissertations

The purpose of this dissertation was to examine the deadliest shooting that has happened on a community college campus. The following research questions guided this dissertation study: (1) What was the law enforcement response to the deadliest community college campus shooting in history? (2) Did previous mass shootings inform the law enforcement response to the deadliest community college campus shooting? (3) What implications for practice can be derived by studying the deadliest of these shootings? This case study utilized multiple sources of information, from official police reports, official institutional reports, archives of publications, and participant interviews from some of the …

Picturing A Nation Divided: Art, American Identity And The Crisis Over Slavery, Louise Michelle Hancox

Graduate Theses and Dissertations

In 1859, Arkansas artist Edward Payson Washbourne produced a lithograph entitled the Arkansas Traveler. Based upon a popular folktale originating twenty years earlier, Washbourne used the image to convey his understanding of the crisis over slavery in the western territories. Artists in north and south responded to the slavery debate with differing visions of the western landscape; one characterized by free labor, the other slave. Westward expansion also highlighted debate about Indians, long relegated to the role of the savage other by the myth of the frontier. Yet, on the southern frontier, the conversation was different, as slaveholding Cherokees claimed …

Moulins: Down The Arctic Drain, Jonathon Nugent Carlson

Graduate Theses and Dissertations

This observation-style nonfiction documentary film follows a National Science Foundation expedition to the Greenland ice sheet. The bivouac lasted for 25 continuous days. University of Arkansas Professor of Geosciences Matt Covington, Ph.D. teamed up with University of South Florida Professor Jason Gulley, Ph.D. to plan, propose, and ultimately accomplish the research goals of the expedition with the assistance of Ph.D. student Celia Trunz, M.S., and experienced expeditionary team member Vickie Siegel. As an observational-style documentary film, all scientific background information imparted herein is taken directly from interviews conducted with Professor Covington, to minimize opining.

The film begins in mid-flight, as …

The Effect Of An Adult Esl Project-Based Literacy Training On Teacher Practice, Rachel Lynn Gerner

Graduate Theses and Dissertations

This case study evaluates the effectiveness of a project-based learning professional development training conducted at a literacy center for nine ESL teachers who are working in a workforce literacy environment. The researcher investigated principles of andragogy in the training and examined whether participants implemented the content of the training in their teaching environments via observation, self-reported answers on a questionnaire, individual interviews, and a focus group. There was no direct follow-up after six weeks of the training. The findings of the study indicate that none of the teachers implemented project-based learning in their teaching environment directly following the professional development …

Crisis Management And Student Conduct On College Campuses: The Role Of Adminstrative Discretion, Aisha Sherea Kenner

Graduate Theses and Dissertations

Crisis Management is a very important part of higher education on college campuses across the nation. Violent events that have occurred in recent years have caused universities to examine how they respond to critical incidents that have negatively affected students, faculty and staff. Because these incidents have resulted in death, injury and other negative consequences, more consideration is given to various aspects of critical incident management such as administrative discretion. This study concentrated on examining the intersection between crisis management and administrative discretion at institutions of higher education (IHE).

Mental health status, laws with relation to information sharing and disability …

Characterization Of Bacteriorhodopsin And Halorhodopsin Reconstituted In Lipid Bilayer Membranes, Joel Domkam Kamwa

Graduate Theses and Dissertations

Motivated to produce electricity with photon activated ion pumps, the main purpose of this work was to characterize the photosynthetic membrane proteins bacteriorhodopsin (proton pump) and halorhodopsin (chloride pump). The proteins were re-suspended in lipid bilayers. For this work, an experimental set-up was built which included: chambers for lipid bilayer formation and characterization, lasers for ion pump activation, and an AxoPatch electrophysiology system for small photocurrent measurement. Lipid bilayer membranes were formed using mostly folding method: folding two monolayers together. The membranes were characterized by their resistance, capacitance, and generated photocurrent. Photocurrent was generated upon illumination of lipid-protein membranes with …

Mitochondrial Mrna Translation Is Required For Maintenance Of Oxidative Capacity, David Lee

Graduate Theses and Dissertations

Oxidative metabolism is required to produce adequate energy to sustain human life. A primary example of deteriorating oxidative capacity is seen in the cardiac musculature during chronic heart failure. This suggests that by improving oxidative potential, chronic heart disease could be mitigated and one approach to accomplish this may be through targeting the mt-mRNA translation system. Purpose: This investigation’s purpose was to characterize disruptions in mt-mRNA translation machinery in multiple forms of cardiomyopathy and to determine if mitochondrial mRNA translation initiation factor (mtIF2) is necessary to maintain oxidative capacity in cardiomyocytes. Methods Using a combination of animal and cell culture …

Interpretation And Fracture Characterization Of Early-Cretaceous Buda Limestone Formation Using Post-Stack 3d Seismic Data In Zavala County, Texas, Andrey Smirnov

Graduate Theses and Dissertations

The Buda Limestone is a naturally fractured Early Cretaceous carbonate formation in south Texas which unconformably underlies the Eagle Ford Shale. Matrix porosity of the Buda is less than 6%, therefore natural fractures improve the potential for commercial hydrocarbon production from this tight limestone formation. This presents a challenge for producers to identify these zones using well log and post stack 3D seismic data typically available to medium or small exploration companies. This project provides a workflow based on well log analysis tied to seismic acoustic impedance (AI) inversion to locate areas of probable natural fractures. Acoustic impedance inversion was …