Digital Commons Network^™

Integrating Uav-Based High-Throughput Phenotyping, Genomics, And Deep Learning To Improve Prediction Of Complex Traits In Winter Wheat, Swas Kaushal

Electronic Theses and Dissertations

Accurate prediction of complex agronomic traits such as grain yield and yield components remains a central challenge in winter wheat breeding because these traits are controlled by many genes and are strongly influenced by environmental variation. The integration of high-throughput phenotyping (HTP), genomics, and advanced machine learning approaches offers new opportunities to improve predictive accuracy and accelerate genetic gain in plant breeding. This study evaluates the use of an unmanned aerial vehicle (UAV)-based multispectral phenomics combined with genomic information, and deep learning approaches to enhance the prediction of grain yield (GY), test weight (TW), grain protein content (GPC), and tiller …

Butting Heads With Respiratory Disease: Post-Epizootic Demography And Movement-Driven Spillover Risk In A Badland’S Bighorn Sheep (Ovis Canadensis) Meta-Population, Sean P. Ryder

Electronic Theses and Dissertations

Respiratory disease caused by Mycoplasma ovipneumoniae is among the most significant threats to bighorn sheep (Ovis canadensis) conservation in North America. In July 2021, contact between bighorn sheep rams and domestic sheep north of Badlands National Park (BADL), South Dakota, USA introduced M. ovipneumoniae into the Badlands bighorn sheep meta-population, triggering an epizootic that reduced the population by approximately 80%. I evaluated the post-outbreak status of this population through two complementary studies conducted from 2023 to 2025. In Chapter 1, I quantified disease prevalence, adult survival, lamb recruitment, and population growth rate (λ) using serial quantitative polymerase chain reaction (qPCR) …

Evaluating Supplementation Strategies Using Precision Livestock Technologies And Energy Based Models In Developing Beef Heifers Grazing Dormant Rangeland, Kali-Jo Bentz

Electronic Theses and Dissertations

Replacement beef heifer development in extensive grazing systems is challenged by variation in forage quality, supplement intake, and animal behavior, all of which influence the ability to achieve targeted growth prior to breeding. Precision livestock technologies (PLT) enable continuous monitoring of individual animal performance, while energy-based nutritional models support individualized supplementation. However, their application under extensive grazing conditions remains poorly understood. Therefore, the objectives of this thesis were to (1) evaluate heifer utilization of multiple precision livestock technologies and their relationship with animal performance and (2) evaluate the accuracy of an individualized energy-based supplementation model by comparing predicted supplement allotments …

The Influence Of Controlled Intake And Anabolic Implant Timing On Growth Performance And Carcass Traits In Feedlot Ruminants, Justin J. Delver

Electronic Theses and Dissertations

The objective of this dissertation was to evaluate how previous plane of nutrition and anabolic implant timing interact to influence growth performance, composition of growth, and the carcass characteristics in ruminants. Three experiments were conducted using cattle and sheep models to determine the metabolic adaptations driving compensatory growth. In experiment 1, yearling beef steers (n = 192) were fed ad libitum for 141 days (ADLIB) or restricted to 92% of ad libitum intake for 56 (RES56) or 86 (RES86) days followed by realimentation. Cumulative dry matter intake (DMI) was reduced in both restricted groups (P = 0.002) with no difference …

Effect Of Female Employment On Household Expenditure In Bangladesh, Fatema Binte Sharif

Electronic Theses and Dissertations

Female labor force participation (FLFP) in Bangladesh has increased from 29.2% in 2005–06 to 42.8% in 2022, raising important questions about household resource allocation. This study examines the impact of female employment on household expenditure patterns and challenges the traditional unitary model of decision-making. It focuses on how income controlled by women influences spending across essential and non-essential categories. The analysis uses data from the Household Income and Expenditure Survey (HIES) conducted by the Bangladesh Bureau of Statistics. This research employs Seemingly Unrelated Regression (SURE) approach to estimate budget shares for food, housing, health, education, clothing, and transport. The study …

Risk And Protective Factors For Suicidal Thoughts And Behaviors For Black Adolescent Males With Exposure To Adverse Experiences Post-Covid 19 Pandemic: Findings From The 2023 National Youth Risk Behavior Survey., Amanda Minogue

Electronic Theses and Dissertations

Suicide is the second leading cause of death among adolescents aged 10-24 in the United States. In 2022, 784 Black adolescent males died by suicide. Recent studies have found that traditionally common associations of risk factors of suicidal thoughts and behaviors are not experienced by Black adolescents, challenging how to determine and detect risk. This dissertation reviewed the variables in the national Youth Risk Behavior Survey that closely align with risk and protective factors of suicidal thoughts and behaviors, and the interaction between these and adverse experiences in Black adolescent males. Results of this study found that among the 9 …

The Role Of Fast-Food Consumption, Residential Fast-Food Exposures, And Urinary Essential Trace Heavy Metals In Colorectal Cancer (Crc) Outcomes., Jeevan Adhikari

Electronic Theses and Dissertations

Background: Colorectal cancer (CRC) is a public health concern. Within the United States (US), fast-food consumption and environmental exposure to heavy metals have increased. The impact of fast-food consumption frequency from fast-food restaurants, residential fast-food exposures, and urinary essential trace heavy metals in relation to CRC outcomes have not yet been rigorously evaluated in the US. Methods: Within the LEAPS-CRC study, we used geographic information systems (GIS) and logistic regression to study the association of fast-food consumption, residential proximity to a fast-food outlet, and urinary essential trace metals with CRC incidence. Additionally, within Kentucky Cancer Registry (KCR) CRC cases, the …

Residential Segregation And Breast Cancer In Louisville: Impact Of Race And Contextual Factors On Advanced-Stage Diagnosis, Delayed Treatment, And Disease-Specific Mortality., Toheeb Ajani Mustapha

Electronic Theses and Dissertations

Female breast cancer (BC) remains the most commonly diagnosed non-skin cancer and the second leading cause of cancer death among U.S. women. Despite advances in detection and treatment, substantial inequities in BC outcomes persist, driven in part by structural forces such as residential segregation. This dissertation examined the relationship between residential segregation, BC outcomes, and key contextual factors in Louisville, Kentucky. Using data from the Kentucky Cancer Registry, American Community Survey, CDC’s Population-Level Analyses and Community Estimates, and the National Neighborhood Data Archive, the study tested two hypotheses: (1) higher Black/low-income segregation is associated with elevated risks of adverse BC …

Increasing Histidyl Dipeptides In Skeletal Muscle Preserves Muscle Mass And Function In Heart Failure., Mamata Hiraman Chaudhari

Electronic Theses and Dissertations

Introduction: Heart failure is a systemic disease associated with multiple comorbidities, such as skeletal muscle wasting and cardiopulmonary disease. Muscle wasting in heart failure patients is a severe comorbidity associated with decreased exercise capacity and poor quality of life. Previous reports show that oxidative stress is increased in the skeletal muscle of heart failure patients, which can directly lead to muscle wasting. However, antioxidant intervention in these patients was unable to improve cardiac function and consequently had no effect on muscle wasting. Although oxidative stress is the primary driver of skeletal muscle atrophy, no attempt has been made to examine …

Further Characterization Of The Fungal Effector Mvlg-01732 In Planta And Heterologous Expression Of Fungal Effectors In Different Smut Fungi., Joseph Paul Ham

Electronic Theses and Dissertations

Host-pathogen interactions in smut fungi are characterized by effector proteins and their role in infection. The goal of this work is to better understand these interactions by further characterizing an effector from Microbotryum lychnidis-dioicae and heterologously expressing this and other effectors in heterologous species to see if the range of these effectors can play a role in pathogenicity when expressed in distantly and closely related fungal species. These effectors have been attuned over time to their host plant but have homologous interactors in other plant species. In this study, Microbotryum lychnidis-dioicae, Sporisorium reilianum, and Ustilago maydis, were all used …

The Educational Experiences Of Low Socioeconomic, Hispanic, Emergent Bilingual, Elementary Students: A Sequential Mixed Methods Study From Texas, Kiley Schumacher

Electronic Theses and Dissertations

The number of Hispanic students in Texas public schools has significantly increased over the past 20 years, yet their level of academic success continues to lag. Hispanic, emergent bilingual, low-socioeconomic, early elementary students face educational challenges related to barriers surrounding language and culture differences, limited resources, unmet needs, feelings of isolation, and an underprepared educational support system. This sequential mixed methods study reported on the perceptions of parents, teachers, and campus leaders in two Texas elementary schools regarding these students’ educational experiences. Guided by existence, relatedness, and growth theory, bioecological systems theory, and culturally responsive leadership theory, the study collected …

Educational Experiences And Educational Attainment Of Elementary Students From Low Socioeconomic Status Backgrounds: Sequential Mixed Methods Evidence From Texas, Morgann L. Hawkins

Electronic Theses and Dissertations

Students from low socio-economic status (SES) backgrounds face significant challenges in their educational experiences and educational attainment, and this is due to barriers related to their identity and background, inadequate support systems, and a lack of understanding of the traumas they experience. This sequential mixed methods study contains the perceptions of teachers, teacher leaders, counselors, and campus leaders in four high-poverty elementary schools in one Texas school district about the educational experiences and educational attainment of students from low SES backgrounds. The informal literature review focused on six spaces: 1) child, family, and community; 2) students from low SES backgrounds; …

Uncovering Conserved Biosynthetic Gene Clusters And Interbacterial Interactions Of Myxobacteria In Polymicrobial Communities, Shailaja Khanal Pokharel

Electronic Theses and Dissertations

Myxobacteria are prolific producers of specialized metabolites and key contributors to microbial interactions within soil and other environments, yet fundamental questions remain about the conservation of their biosynthetic capacities and the dynamics that shape their coexistence with neighboring microorganisms. This dissertation addresses these gaps through three integrated research directions. In Chapter 2 we utilized a pan-genome framework across eleven genera and 195 sequenced genomes,including ten newly reported isolates, and found five BGCs were identified as the conserved BGCs across the Myxococcota. These clusters encode metabolites with established ecological functions, none of which are known toxins, suggesting selective maintenance of signaling …

Current Knowledge And Perspectives Of Relative Energy Deficiency In Sport In An Athletic Environment, Meredith Rebecca Morgan

Electronic Theses and Dissertations

Sport performance personnel are in a unique position to directly impact athletes. While the primary individuals who manage athlete health are physicians, sport dietitians, and certified athletic trainers, sport coaches and strength and conditioning coaches also play an impactful role in an athlete’s performance and well-being. Using an original survey, this study investigated REDs knowledge by certified athletic trainers, strength and conditioning coaches and sport coaches. The survey was employed to assess sport performance professionals’ general knowledge of Relative Energy Deficiency in Sport (REDs) and low energy availability (LEA) and opinions on the role of health professionals in REDs identification, …

Building Focus: Using Relaxation Music To Support Students With Autism In The Classroom, Whitney Drewrey

Electronic Theses and Dissertations

This study explores the use of audio sensory input, specifically, relaxation music, as a strategy to reduce off-task behavior in elementary students with autism within the general education classroom. The aim was to minimize distractions and teacher redirections, thereby promoting a more inclusive and productive learning environment for all students. Guided by the principles of improvement science, the research employed a single-case design with three elementary students diagnosed with autism. Data were collected through momentary time sampling and mood inventories during independent classwork periods.

The central research question guiding this study was: What effect does relaxation music have on the …

The Ecology Of Arthropod Rain In A Tropical Forest., Andrew Robert Seiler

Electronic Theses and Dissertations

Tropical forests are structured by complex vertical linkages and nutrient exchanges between canopy and understory habitats. These linkages include the downward flux of organisms, the movement of canopy fauna, and the recycling of nutrients through litter and organic matter deposition. This dissertation investigates arthropod rain and its role in connecting the canopy and forest floor processes in a lowland tropical forest in Panama. Chapter 2 quantifies “arthropod rain”, the fall of canopy arthropods into the understory. Using pan and pole traps, I measured the composition, abundance, and biomass of arthropods falling from the canopy and assessed environmental drivers of the …

Congolese Mothers' Beliefs That Influence Health-Seeking Behaviors For Their Infants., Shawn Meiman

Electronic Theses and Dissertations

In 2024, approximately 100,000 refugees were admitted to the United States, with 20% coming from the DRC, while Kentucky continues to rank fourth in the country for refugee resettlement. The increasing number of Congolese refugee children in the United States and Kentucky necessitates a greater understanding of these beliefs and practices to ensure equitable, quality, and culturally informed health services. The purpose of this study was to explore Congolese refugee mothers’ culturally and socially situated beliefs, perceptions, practices, and resources related to health care that may influence their views and practices of preventive well-child health care for their infants in …

Investigating The Origins Of Symbiosis Using A Novel Mycorrhizal Interaction In Pasque Flowers (Pulsatilla Patens), Savannah Lane Draud

Electronic Theses and Dissertations

Mycorrhizal fungi form mutualistic symbioses with most land plants, occurring primarily as arbuscular mycorrhizal (AM) fungi or ectomycorrhizal (ECM) fungi. Pulsatilla patens, an herbaceous perennial widely distributed across Eurasia and North America, belongs to a plant family historically known only to form AM associations. However, recent discoveries of ECM P. patens individuals in northeastern Poland raise questions about the mycorrhizal status and evolutionary trajectory of this species. Because ECM formation in this lineage is likely evolutionarily recent, P. patens offers a valuable system for investigating the ecological and historical factors that facilitate the emergence of ECM symbiosis.

Chapter 1 assessed …

Assessing Post-Pandemic Engagement In The Supplemental Nutrition Program For Women, Infants, And Children (Wic) In Northeast Tennessee, Christen Minnick

Electronic Theses and Dissertations

Since 1974, the federal Supplemental Nutrition Program for Women, Infants, and Children (WIC) has provided healthy food resources, nutrition education, and provider referrals for families at risk for poor nutrition. Public health professionals have consistently presented evidence that WIC engagement reduces premature births and infant mortality, improves child health and development, and increases specialized care access for participants. While average monthly participation in WIC has increased since the program’s inception, trends indicate that only around half of eligible families have consistently engaged with the program since 2011. Research has linked declining WIC participation to administrative burden, citing learning, psychological, compliance, …

Teacher Perceptions Of The Effectiveness Of Voluntary Pre-Kindergarten Attendance, Kimberly Taylor

Electronic Theses and Dissertations

The purpose of this study was to identify the perceptions of educators with respect to student enrollment in voluntary pre-kindergarten classes provided through the Tennessee Department of Education in public schools. The data collection strategy used to gain teacher perspectives was through conducting one-on-one interviews with 15 educators in three Tennessee school districts. To qualify for the study, teachers must have been teaching in kindergarten classrooms that receive students who had previously been enrolled in the school’s pre-kindergarten program. Data collection and analysis were based on the Grounded Theory approach which uses data that is systematically gained and analyzed to …

Isolation, Chemical Characterization, And In-Vitro Cytotoxic Evaluation Of Novel Polar Flavonoids From Chromolaena Leivensis, Matthew Tohatsu Tetteh

Electronic Theses and Dissertations

This study focuses on isolation, chemical characterization, and in-vitro cytotoxic evaluation of novel polar flavonoids from chromolaena leivensis. A 95% ethanolic extract of c. leivensis shipped by Prof. Ruben Torrenegra from University of Applied and Environmental Sciences, Bogota, Colombia, was dissolved in 1:1 methanol/chloroform mixture and its purity analyzed by TLC. The sample was eluted with toluene/methanol in an increasing order of polarity on silica gel, resulting in 49 fractions labelled CLA1 to CLA49. Among these fractions, CLA10 (1) and CLA19 (2) obtained yellow and white crystals. They were analyzed by GCMS, IR, and …

Advancing Medical Education With Lifestyle Medicine: A Comprehensive Program Evaluation Using The Kirkpatrick Framework, Shanna L. Mello

Electronic Theses and Dissertations

This dissertation examined how a U.S. national lifestyle medicine residency curriculum influenced resident learning and practice using a program evaluation paradigm with a convergent mixed methods design guided by Kirkpatrick’s four-level evaluation model. The problem addressed was the persistent gap between evidence for lifestyle interventions and the limited preparation residents receive to deliver lifestyle counseling in routine care. The purpose of the study was to evaluate changes in residents’ reactions, learning, and clinical behaviors and to identify early patient-level signals and the implementation conditions that enabled or constrained behavior change. Quantitative methods analyzed archived pre- and posttraining surveys from 148 …

School Leaders’ Perceptions Of Restorative Practices On Student Behavior, Jennifer Mary Herold Fontenot

Electronic Theses and Dissertations

United States public schools turned to a zero-tolerance approach to school discipline with hopes of improving school safety and climate in the 1990s. Administrators dispensed consequences such as suspension and expulsion without considering the whole student, regardless of the student’s conditions, motivations, or background. Many schools today focus on punitive measures rather than a holistic approach that considers the root causes of behavior, such as socioeconomic factors, mental health issues, or the student’s home life. Such actions can lead to disproportionately harsh punishments for marginalized students, particularly those from low-income backgrounds or communities of color, exacerbating existing inequalities. Thus, the …

Nursing Education For Type 2 Diabetes And Nutrition Using Individual 1:1 Sessions In Rural Health Care, Meagan F. Wheat

Electronic Theses and Dissertations

What if proper nutrition were a nonpharmacological treatment for health problems? Nutrition is an important key to overall wellness. When patients receive the right education, they not only get the proper nutrition in their diet but also can manage their diabetes and live a better quality of life. In rural U.S. health areas, lack of access to nutrition is a barrier to patient care. Rural areas are at an even higher risk due to a lack of resources for good nutrition. One-to-one nutrition education with a nurse specialized in diabetes helps teach patients at a learning level they will comprehend. …

Differences In Peer Social Connections Between Traditional And Online Nurse Residency Programs, Tatum Leonard

Electronic Theses and Dissertations

The anticipated retirement of baby boomer nurses by 2030 will intensify the global nursing shortage, a crisis that demands innovative strategies for onboarding and retaining new graduate nurses. Nurse residency programs (NRPs) are designed to ease the transition from student to practicing nurse, reduce turnover, and foster professional resilience. Amid the COVID-19 pandemic, many NRPs rapidly transitioned from traditional, in-person seminars to synchronous, online formats. This study explored differences in peer social connections between traditional and online NRPs, focusing on three constructs: sense of community, collaborative learning, and peer social support. Using a quasi-experimental, mixed methods approach, this secondary data …

Chronic Pain: An Exploration Of The Experience Of Chronic Pain, Andrea Alzalde

Electronic Theses and Dissertations

Chronic pain is a pervasive public health issue within Western society today and amongst humans worldwide. Although chronic pain is something that many people have or will experience sometime in their life, it is a complex experience that does not have a simple universal solution or immediate cure. The causes of pain can be a multitude of things and the treatments that work for some may not work for others. The current research seeks to explore the experience of chronic pain to help fill gaps in the wider research of pain. This study pursues answers to two research questions including; …

Chew On It: A Pilot Study Of A Multimodal Assessment Of Mastication Protocol, Michelle Catão

Electronic Theses and Dissertations

Despite its subconscious nature, deglutition is an elaborate and multifaceted process, contingent on the activation of specific neural pathways and muscles. The inherent complexity gives rise to a wide array of potential complications and difficulties, known as dysphagia. Screening and assessment for dysphagia aid in determining the presence and etiology of swallowing difficulties, providing information that is critical for maintaining and improving the health status of vulnerable populations from the standpoint of nutrition, hydration, and socialization (Dziewas et al., 2017). Previous studies surrounding dysphagia assessment have prioritized formulating clinical protocols to evaluate the nonvolitional stage, often failing to address the …

Exploring The Self-Efficacy And Experiences Of Caregivers Using Thickened Liquids To Manage Pediatric Dysphagia, Jaimee E. Conmy

Electronic Theses and Dissertations

Pediatric dysphagia affects 1 in 37 typically developing children under five, with increased prevalence in at-risk populations. Thickened liquids are often used as an intervention despite limited evidence supporting their effectiveness in the pediatric population. Caregivers play a critical role in managing their child’s dysphagia, yet their experiences, self-efficacy, and challenges with thickened liquids remain underexplored. This mixed-methods study surveyed 57 caregivers of children on thickened liquid diets, to assess their self-efficacy, education, perceptions of effectiveness, and overall impact on their quality of life. Findings highlight gaps in caregiver training, concerns about preparation, and benefits and/or challenges experienced by caregivers. …

Sociodemographic, Neighborhood-Level, And Health-Related Factors Associated With Progression To Bariatric Surgery: A Retrospective Chart Review., Angela Godwin

Electronic Theses and Dissertations

Background: Bariatric surgery is the most effective treatment for patients with Class 3 obesity. However, of individuals who start the bariatric surgical process, only about half undergo surgery. Factors associated with completion, including race, have been described; however, consistent evidence on obstacles remains to be identified.

Objectives: To explore variables based on the Social Ecological Model (SEM) that may be related to bariatric surgery completion.

Setting: A large, private hospital with a Bariatric Center of Excellence in New York City

Methods: This retrospective chart review utilized data from adults who established an initial bariatric surgery visit from April 1, 2012, …

Describing Latent Tuberculosis Infection And Treatment Completion In Virginia: A Social Determinants Of Health Approach, Amber N. Harmon

Electronic Theses and Dissertations

While the treatment of latent tuberculosis infection is a key strategy in tuberculosis elimination nationally and globally, there is a limited understanding of the general prevalence of latent tuberculosis as well as factors related to successful treatment. This dissertation describes the known landscape of latent tuberculosis in Virginia and explores possible factors related to latent tuberculosis infection treatment through three manuscripts. The first manuscript, Chapter 1, outlines the overall proposal for this dissertation research in the style of a National Institute of Health grant proposal. The second manuscript, Chapter 2, describes the current understanding of the factors related to latent …