Digital Commons Network^™

Directed Genome Evolution To Identify Genes For Macrophage Survival By Staphylococcus Agnetis, Sonali Lakshika Anne Lenaduwe Lokuge

Graduate Theses and Dissertations

Bacterial Chondronecrosis with Osteomyelitis (BCO) is a debilitating infection that negatively impacts animal welfare and costs the broiler industry billions of dollars annually. We have previously isolated Staphylococcus agnetis 908 from BCO samples obtained from broilers at the University of Arkansas research farm. This isolate can induce BCO lameness at greater than 50% in broilers exposed to the pathogen in drinking water. We found that S. agnetis 908 is capable of surviving and escaping macrophages compared to a closely related cattle isolate,1379. Through Directed Genome Evolution (DGE) we identified that this difference is at least partially associated with an alanine …

Choice Overload, Information Acquisition, And Gift Incentives In An Altruistic Context: Economic Experiments Exploring Decision Making In Charitable Giving, Jessica Adach White

Graduate Theses and Dissertations

This dissertation contains three essays on economic experiments concerning altruistic motives. The first chapter, “Choice Overload and Charitable Giving: Can There Be Too Much of a Good Thing?” concentrates on the effects of list sizes of charitable options on an individual’s decision making. The second chapter, “Is No News Good News? Motivated Reasoning in Charitable Giving,” focuses on the impact of information acquisition on an individual’s altruistic contributions. Finally, the third chapter, “Thank You, but No Thank You: Gift Incentives in Charitable Giving,” investigates gift incentives and their influence on donating behavior.

In the first chapter, “Choice Overload and Charitable …

Investigation Of Membrane Based Processes For Biomedical Applications, Efecan Pakkaner

Graduate Theses and Dissertations

As substantial developments were achieved in nanotechnology and polymer engineering, especially in the last few decades, the use of membranes and membrane-based procedures was found to be expanding into more and more research and development areas; including biological engineering, life sciences and biomedical engineering. Not only have they been the main focus of meaningful research, but they have also been the main pieces of the solutions to very thorny problems encountered within a wide range of applications from microfluidics to water treatment, thanks to their versatility, cost-effectiveness and biocompatibility, when compared to conventional separation techniques. To celebrate and embrace these …

Weather Permitting, Acadia Kandora

Graduate Theses and Dissertations

Weather Permitting is an exhibition of objects and printed matter, primarily in the form of publicationsthat examine my relationship to nature and the idea of nature as both sanctuary and armor. At a young age, my parents would take my on a hike every Sunday instead of going to church. The hikes acted as a weekly pilgrimage deep into the woods and a ritual instilling the idea of nature being a place of spiritual refuge and retreat. A sanctuary - of course, weather permitting.

As I grew up and experienced hardship, my first instinct has always been to go hide …

In Search Of Ourselves, We Find Each Other, Kalyn Fay Barnoski

Graduate Theses and Dissertations

in search of ourselves, we find each other is a fully collaborative, multi-platform exhibit centered on developing and locating relationships to both self and community. Challenging societal individualism, the exhibit focuses on collective, relational creativity using Indigenous methodologies for community. It is about me. It is about you. It is about us.

Heartwork, Lance Taylor Loftin

Graduate Theses and Dissertations

Heartwork is a collection of paintings, drawings, and sculptures that explore the many ways identity is shaped by familial histories and personal memory. Focusing on my time growing up on a pine tree farm in Jackson, Mississippi in the early 90s, Heartwork explores gender, religion, regional traditions, family, and art. Through conversations and collaborations with my family, painting acts as an impetus for strengthening relationships. By reevaluating the past, I am able to create a web of interconnected narratives that inform and shift my understanding of the present.

Managing Climate Change And Weather Extremes For Nature-Based Tourism Organizations In The United States, Siyao Ma

Graduate Theses and Dissertations

Weather and climate serve as profound motivators for tourism travels. Much of the United States (US) has experienced a warming trend as well as higher extreme weather frequency, and the trends are projected to be continued. Consequently, the changing climate is expected to have both direct and indirect impacts on tourism decision-making and travel patterns due to the complex relationship between climate, weather, and outdoor recreation. Climate resources capture the integrated effects of varied meteorological variables that interact with humans in different ways and can be categorized along a spectrum of quantifiable values. This dissertation proposed a Camping Climate Index …

The Influence Of Singlet Oxygen And Loss Of Function Of Fatty Acid Desaturase 7 In The Chloroplast On Aphid Resistance In Arabidopsis Thaliana, Hillary Donna Fischer

Graduate Theses and Dissertations

Fatty Acid Desaturase 7 (FAD7) is a chloroplast-localized enzyme that alters the fatty acid content of photosynthetic membranes, and that negatively regulates plant defenses against aphids. Previous studies in the model organism Arabidopsis (Arabidopsis thaliana) have shown that loss-of-function mutations in FAD7 decrease population growth of the green peach aphid (GPA; Myzus persicae Sulzer). This study further characterized the effects of a fad7 null mutant on aphids, and investigated the role of reactive oxygen species (ROS), including singlet oxygen (1O2), in plant responses to aphid resistance in fad7 as well as in wild type plants and a mutant with heightened …

Survey Of Ticks And Tick-Borne Pathogens Associated With Feral Swine (Sus Scrofa) In Arkansas, Haylee Campbell

Graduate Theses and Dissertations

Feral hogs (Sus scrofa L.) are an invasive species throughout the southeast United States and found in every Arkansas county. As feral hogs invade new habitat, they can disrupt ecosystems, damage agriculture systems, and bring ticks and tick-borne pathogens with them. There are no surveys of the tick species parasitizing the Arkansas feral hog populations or the pathogens they carry. This is a public health concern because feral hogs occupy often same geographical regions as humans and livestock and can harbor over 45 animal diseases and parasites. The ticks carried by feral hogs can carry tick-borne pathogens that can cause …

Developing A Microdialysis Sampling-Based Biofilm/Macrophage Co-Culture Model, Alda Diaz Perez

Graduate Theses and Dissertations

The host immune system and bacterial cells are known to interact during the human lifetime. Bacteria secrete a wide variety of signaling molecules, known as quorum sensing (QSC) molecules, that modulate the host immune system. While immune-biofilm interactions involve this chemical signaling network, the mechanisms through which this occurs are not well understood. This work aimed to develop a new method that can be used not only in vitro settings but also in vivo. The microdialysis sampling technique has widely been used in in vitro and in vivo settings in humans, mice, and rats for the collection of neuropeptides, cytokines, …

A Tough Nut Never Boils: Thoughts And Ruminations On Language And Playmaking, Lauren Ferebee

Graduate Theses and Dissertations

After an unorthodox journey through higher education ending during the coronavirus pandemic, which has made the typical theatrical thesis production and subsequent typical final year impossible, the author reflects on the body of work she has created at the University of Arkansas as an M.F.A. candidate in playwriting at the Department of Theatre, how she has reached both deeper into her own discipline and outside of it to widen her understanding of liveness, performance, and textual creation. She interrogates her own unexpected experiences, from figuring out how to make theatre without theatres, to teaching students who have never seen a …

Resistance Screening And Association Mapping For Resistance To The Downy Mildew Pathogen Of Spinach, Dotun Olaoye

Graduate Theses and Dissertations

Spinach is an important cool leafy vegetable cultivated around the world, with large scale production in California and Arizona in the U.S. Spinach is a highly nutritious vegetable beneficial in the human diet. Spinach is affected by a number of biotic stressors. Downy mildew, caused by the oomycete pathogen Peronospora effusa, is a major threat to spinach as it affects the leaf quality and impacts the economic value of spinach. Several efforts have led to the development of resistant genotypes/cultivars to this pathogen. However, few studies have examined the genetics of resistance to the downy mildew pathogen in detail. This …

Crop Response To Low-Dose Dicamba, Mason Castner

Graduate Theses and Dissertations

The introduction of dicamba-resistant (DR) soybean [Glycine max (L.) Merr.] and cotton (Gossypium hirsutum L.) followed by a label allowing over-the-top applications of dicamba in the 2017 provided growers an additional option for broadleaf weed control. Because non-DR soybean is sensitive to low concentrations of dicamba, postemergence dicamba applications present growers choosing to plant non-DR soybean with concerns of damage from off-target movement through physical drift and volatilization of the herbicide as well as tank-contamination from prior dicamba application. Consequences of low-dose dicamba exposure on sensitive vegetative and reproductive soybean have been well researched, but little is known regarding the …

Sex-Based Differences In Acvr2b And Grb10 Expression In Skeletal Muscle During Induced Cancer Cachexia And Disuse, Lauren Martinez

Graduate Theses and Dissertations

Background: Muscle atrophy is the shrinkage of muscle fibers that are largely maintained by a balance of protein synthesis and degradation. Imbalances in protein synthesis and degradation are observed in different muscle atrophy disorders such as cancer cachexia and disuse. These forms of muscle atrophy produce distinct wasting pathologies that are influenced by biological sex. Activin receptor type-2B (ACVR2B) and Growth factor receptor-bound protein 10 (GRB10) have been identified as genes that potentially regulate muscle mass while also displaying sexually dimorphic differences. Purpose: To examine the influence of ACVR2B and GRB10 throughout the development of cancer cachexia and disuse-induced atrophy …

Telepractice In The Communication Treatment Of Individuals With Post-Stroke Aphasia: Systematic Review, Gayanthi Kodituwakku-Wewalwala

Graduate Theses and Dissertations

Telepractice, a branch of telehealth, which is the delivery of services to distant sites employing telecommunication, has been developing rapidly nowadays. Owing to the nature of the condition and treatment foci in aphasia, telepractice has been identified as a potential mode for intervention to persons with aphasia (PWA) in the field of speech-language pathology. Based on the American Speech-Language Hearing Association (2005), telepractice is considered a means to extend services to a wider context overcoming the barriers of transportation, costs, and limited availability of services. Thus, exploration of treatment accessibility to underserved populations in middle/low-income countries or rural areas via …

Quantifying The Leaching Of Nutrients And Metals In A Pasture Soil As Affected By Excreta Of Ruminants Fed Alternative Diets, Ian Kennedy

Graduate Theses and Dissertations

The leaching of nitrate through the soil profile and into adjacent water systems has been a leading cause of water pollution and results in the loss of a valuable nutrient from animal production systems. Forage-based animal production systems may be improved through manipulation of animal diets that incorporate tannins and total polyphenolic compounds with feed, increasing the amount of nitrogen (N) retained by an animal/decreasing rates of digestion and altering the N-containing compounds that are excreted and deposited onto soil. Incorporating the forage legumes sericea lespedeza (Lespedeza cuneate [Dumont de Courset] G. Don) and lablab (Lablab purpurues L.) into the …

Assessment Of Meat Quality Attributes Of Four Commercial Broiler Strains Processed At Various Market Weights, Ashleigh Jo Mueller

Graduate Theses and Dissertations

As the demand for poultry meat continues to grow, the industry is challenged with how to meet these needs of consumers. The growth rate of broilers is continuously improving in order to increase production efficiently resulting in greater yields and an increase in product to satisfy consumer needs. However, the industry has seen an increase in quality issues of the meat as growth rates and growth periods continue to increase. The objective of this study was to evaluate the effect of various strains (standard and high-yielding) and target weights on meat quality attributes such as pH, water holding capacity (WHC), …

Impact Of Different Plant-Based Foods Consumption On The Composition And Diversity Of Gut Microbiota, Ayoub Al Othaim

Graduate Theses and Dissertations

Plant-based diets are primarily derived from plant sources, including fruits and vegetables. Such patterns are associated with health benefits by promoting general health and preventing many diseases and metabolic disorders. Fruits and vegetables are key sources of high-quality nutrients such as dietary fibers and polyphenols. Since they are rich in dietary fibers and polyphenols, whole fruits and vegetables represent unique and somewhat understudied modulators of the gut microbiota and its associated functions. This study aims to (i) investigate the impact of varying dilutions of cherry juices concentrate on the composition of the murine gut microbiota, (ii) investigate the impact of …

Short-Term Effects Of Winter Cover Crops On Soil Properties, Yield, And Partial Returns In A No-Tillage Soybean Rotation, Drew Dillon Kirkpatrick

Graduate Theses and Dissertations

Cover crops have the potential to provide many benefits including weed suppression, erosion control, and improvements to soil quality. These benefits can be affected by species, biomass accumulation, and management practices. Although large amounts of biomass are good for maximizing benefits, it can result in problems for establishing the subsequent crop. Soybean [Glycine max (L.) Merr.] accounts for over 50% of Arkansas crop hectares annually; therefore, understanding the effect that a cover crop can have on the following soybean crop is crucial to the successful implementation of cover crops within the state. A study was established to evaluate winter cover …

Poems And Translations, Rome Hernández Morgan

Graduate Theses and Dissertations

This document is separated into two parts, a collection of original poems and a collection of translations of the crônicas of Rubem Braga. The collection of poems, titled, “Because I Never See You,” attempt to parse the complexities of familial and intimate relationships, addiction, and BIPOC experience. The collection of translations attempts to offer a small sample of the crônicas of Rubem Braga (1913-1990), a Brazilian journalist who is known throughout Brazil for “elevating” the form of the crônica from ephemera to the literary.

Influence Of Local- And Landscape-Scale Factors On Avian Assemblage In Fragmented Tallgrass Prairie Landscape, Pooja Panwar

Graduate Theses and Dissertations

Agricultural expansion and increasing urbanization are driving rapid landscape modification in the Tallgrass prairies ecosystem and are affecting biodiversity at multiple spatial scales. Thus, the conservation of fragmented grassland and steeply declining grassland avifauna is dependent on the relationship between local- and landscape-scale factors and avian assemblage. We also need to understand how these factors, operating at different spatial scales, drive the occupancy of different guilds in the assemblage. We conducted repeated point count surveys during the breeding season of 2019 at 66 grassland sites across Arkansas and Missouri, USA. We developed a multi-species occupancy model to estimate species richness, …

Role Of Reptile-Invertebrate Interactions In Enigmatic Reptile Declines, Meredith Swartwout

Graduate Theses and Dissertations

Reptile populations are declining world-wide and the mechanisms behind many of these declines remain enigmatic. Food web interactions (i.e., reduced prey availability or increased predation) have been implicated behind some reptile declines. However, relatively little is known about predation on lizard and snake eggs, despite egg survival being important for population dynamics of some species. Ants are important predators of squamate reptile eggs in tropical and temperate systems. In Costa Rica, long-term declines in terrestrial anole lizards were linked with reduced leaf litter depth, a factor that could influence egg vulnerability to ant predation. Fire ants (genus Solenopsis) are aggressive …

Characterization Of Protein Aggregation Using A Solid-State Nanopore Device, Mitu Chandra Acharjee

Graduate Theses and Dissertations

Protein aggregation has been linked to many chronic and devastating neurodegenerative human diseases and is also strongly associated with aging. In the case of neurodegenerative diseases, α, β tubulins and tau proteins dissociate in a neuron cell and aggregate both intra and extra-cellularly. Tau and tubulin aggregations were found as one of the major causes of many neurodegenerative diseases, such as Parkinson’s, Picks, Alzheimer’s, Huntington, and Prion. Finding the state and mechanism of protein aggregation is significant. In this work, tau and tubulin aggregations were detected in ionic solutions using the solid-state nanopore technique. Besides tau and tubulin, aggregations of …

Andragogy For All? A Look At Arkansas Community College Students' Preferences For Andragogical Assumptions, Emilee Sides

Graduate Theses and Dissertations

Community colleges are tasked with juggling multiple missions. They provide open access to education for adults in their community, work with industry partners to educate the local workforce, and provide relevant programming to the communities they serve. When compared with students at four-year institutions, community college students are older, more ethnically and racially diverse, come from lower socioeconomic statuses, and less academically prepared.

Like other community colleges across the country, one of the primary goals of Arkansas community colleges is to help their students succeed. Unfortunately, the state has historically performed poorly in regard to educational outcomes. To get the …

Mineral Rites, Emma Van Dyke

Graduate Theses and Dissertations

This document is a collection of original poems written between Fall 2017 and Spring 2021.

Values And Success In Collegiate Athletics, Nathan Shelby Hutchens

Graduate Theses and Dissertations

The rapid commercialization of intercollegiate sports has changed the landscape of the hiring decisions and methodologies within university-associated athletic departments – especially within the Division I Football Bowl Subdivision (DI-FBS) (Wong, 2017). Most notably and recently, the strategies used to hire athletic directors (ADs) have underwent considerable revision – yet successful hires are far from a sure thing. Many strategies include allusions to leadership style, yet leadership styles are as numerous as there are researchers who study them – and are rarely implemented holistically, thus making their assessment and associated outcomes tenuous at best (Peachey et al., 2015). Hambrick and …

Investigative Study Of Microalgal And Electrochemical Wastewater Treatment Systems And Modeling Of The Wafer-Enhanced Electrodeionization Using Supervised Learning, Humeyra Betul Ulusoy Erol

Graduate Theses and Dissertations

Wastewater has a serious impact on environment and public health due to its high concentration of nutrients and toxic contaminants. Without proper treatment, excess nutrients discharged in wastewater can cause a damage to the ecosystem such as undesirable pH shifts, cyanotoxin production, and low dissolved oxygen concentrations.

Main objectives of this dissertation work were to investigate i) the biofuel potential of P. cruentum when grown in swine wastewater, ii) the influence of four most commonly used ion exchange resins on the system efficiency and selectivity for the removal of sodium, calcium, and magnesium ions, and iii) the modeling of wafer-enhanced …

Evaluation Of Nutritional Factors That Influence The Efficacy Of Tributyrin As A Feed Additive For Broilers, Brooke Bodle

Graduate Theses and Dissertations

Tributyrin (TB) is a glyceride ester of butyrate that has the potential to improve broiler performance and intestinal development. Therefore, to fully evaluate this potential, three experiments were conducted to evaluate effect of tributyrin (TB) on broiler growth performance, nutrient digestibility, carcass characteristics, intestinal morphology, and gastrointestinal function in birds fed diets varying in composition reared in battery cages and floor pens. Experiment 1 explored the supplementation of graded doses of TB and its impact upon growth performance, nutrient digestibility, and carcass characteristics in a step-down program when added to a reduced energy and amino acid diet. A linear reduction …

Methods To Reducing Weaning Stress In Early Weaned Spring Beef Calves, Matthew Daniel Hahn

Graduate Theses and Dissertations

Reducing weaning stress in beef calves can have dramatic benefits to the health, growth, and performance to beef calves post-weaning. Studies have shown that providing creep feed to calves during the pre-weaning period can improve their nutritional status, which can better prepare them for the stresses they will be exposed to during the weaning process. Studies have also shown that two-stage weaning can reduce the stresses associated with weaning. Previous research has suggested that this method resulted in dramatic changes in behavioral signs associated with stress. The objective of this study was to evaluate the effects of two-stage weaning with …

The Intersection Of Writing Process Pedagogy And Prolepsis: A Phenomenological Case Study Of Secondary Writing Instruction, Jennifer O. Peñaflorida

Graduate Theses and Dissertations

The purpose of this dissertation was to investigate the lived experiences and essences of secondary high school students and participating teachers in a three-week summer journalism camp sponsored by the National Writing Project and funded by the MacArthur T. Foundation. This study employs Moustakas' (1994) modification of the van Kaam method for phenomenological data analysis in order to reveal the intersection of writing process pedagogy and prolepsis, a writing framework I developed. Data sources included pre-and-post writing samples, semi-structured interviews, field notes and student writing artifacts which were collected between May 27, 2019 and June 14, 2019. Data were analyzed …