Digital Commons Network^™

Population Physiology, Demography, And Genetics Of Side-Blotched Lizards (Uta Stansburiana) Residing In Urban And Natural Environments, Spencer B. Hudson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Wildlife populations across the globe are poised to lose their natural habitat to urbanization, yet there is limited information on how different species handle living in cities. Animals in urban environments are often susceptible to novel stressors, which can threaten their individual health and population viability. The physiological characteristics of animals, such as those related to metabolic hormones, oxidative stress, and immunity, are expected to be important for survival in this context. If so, animals persisting in urban areas may demonstrate physiological differences from their natural counterparts, perhaps due to evolutionary change. These potential outcomes have been documented in birds …

Mountain Lion (Puma Concolor) And Feral Horse (Equus Ferus) Interactions: Examining The Influence Of A Non-Native Ungulate On Predator Behavior In A Semi-Arid Environment, Peter C. Iacono

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A non-native is a species that evolved in one ecosystem and has established within another. Non-native species can thrive in new ecosystems as they can spread quickly, outcompete and replace native species, and disrupt food webs. Domestic horses were brought to North America by Europeans in 1493. They are now found in 11 states across the western United States. Feral horses can negatively impact vegetation, endangered species habitat, compete with native species, and be important prey for mountain lions under certain conditions. But do feral horses affect the food web? Feral horses are managed by large removals to reduce the …

Surface-Functionalized Silica Nanocarriers For Mitigating Water Stress In Wheat And Benefiting The Root Microbiome, Anthony Cartwright

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Changes in climate and shifting patterns of drought threaten the growth of important cash crops like wheat. The element silicon serves as a plant nutrient and shows promise for strengthening wheat against drought while remaining safe to both the crop and the positive bacteria that grow on its roots. Silicon can be added to wheat in the form of silicon-dioxide nanoparticles featuring protective coatings made from plant-beneficial nutrients. These nanoparticles can be engineered with high surface area or porous structures allowing them to be loaded with additional nutrients that can be delivered to crops. In a laboratory setting, such nanoparticles …

Investigating Mitochondrial Influence On The Rate Of Anaerobic Glycolysis In An In Vitro Model, Mackenzie Jenna' Taylor

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The rate at which the muscle acidifies after an animal is harvested has a profound effect on the quality of the resulting pork. When acidification increases gradually, desirable pork quality characteristics are developed. In contrast, rapid acidification deteriorates pork quality, exemplified by the pale, soft, and exudative (PSE) pork defect. The rate of acidification is determined by the rate of anaerobic metabolism in postmortem muscle. Yet the processes controlling postmortem anaerobic metabolism are not well understood. Recent research suggests that mitochondria, the powerhouse of the cell, may influence this process by competing for substrate (pyruvate) with anaerobic metabolism, thereby reducing …

Multispecies Genomic Sex Identification Using Ddx3 Gene Polymorphisms, Jessica Felts

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

PCR sex determination assays must be reliable and cost effective due to the frequent and integral use of these assays in biological research and the animal production industry. Thus, the design of proof of a primer pair with a built-in control is warranted to not only bypass the extra cost of a multiplex reaction, but also to prevent anomalous results that have been documented with other primer pairs.

The objective of this study was to design primer pairs with built in PCR amplification control to identify sex in Equus caballus (domestic horse), Homo sapiens (humans), Macaca mulatta (rhesus macaque), and …

Antimicrobial Peptides In Transgenic Silkworm Silk, David Jaden Turner

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Overview: People in India and China have produced silk textiles for thousands of years. Silk is a biodegradable, biocompatible compound used in the production of clothing, bedding, furniture, industrial materials, and medical applications. Over the last 30 years, research has increasingly investigated silk’s antimicrobial effects and how to augment its natural abilities. Antimicrobial peptides, or AMPs, are also an area of increasing interest as the rise of antibiotic resistance reduces the efficacy of current treatments. This project plans to systematically synthesize a fusion protein that incorporates the beneficial properties of each constituent into commercial silkworms.

Innovation: This project seeks to …

Teaching Contextually Appropriate Play Commenting Without The Use Of Visual Cues, Beverly Nichols

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Deficits in communication and play can affect the quality of life of autistic children and individuals, which is why it is important that we help them acquire these skills as early as possible. Applied behavior analysis (ABA) and script training and fading procedures are evidence-based practices that can successfully teach communication during play. However, script fading can be difficult, and scripts may not be able to be completely faded out of the environment. The findings from a recent study suggested that specific phrases can become associated with small pictures rather than written scripts Perhaps, these specific phrases can be tied …

Drug Cartels And Government In Mexico: A Replication And Extension, Lindsey A. Beckstead

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This paper analyzes the relationship between drug cartels and the government in Mexico. It also seeks to determine the reasons for an upsurge of violence and cartel related murders in Mexico.

Stressor: An R Package For Benchmarking Machine Learning Models, Samuel A. Haycock

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Many discipline specific researchers need a way to quickly compare the accuracy of their predictive models to other alternatives. However, many of these researchers are not experienced with multiple programming languages. Python has recently been the leader in machine learning functionality, which includes the PyCaret library that allows users to develop high-performing machine learning models with only a few lines of code. The goal of the stressor package is to help users of the R programming language access the advantages of PyCaret without having to learn Python. This allows the user to leverage R’s powerful data analysis workflows, while simultaneously …

Exploring Body Image Related Cognitive Fusion As A Maintenance Mechanism Of Eating Disorder Pathology, Jennifer L. Barney

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Eating disorders are serious mental health conditions that can have serious negative effects on a person’s physical and mental well-being. These disorders are typically complex, and individuals are often struggling with one or more comorbid mental health problems, making them difficult to treat. To address this complexity and hopefully improve treatment outcomes for those with eating disorders, psychology research examining individual differences that appear to be related to differential treatment responses is needed. Better understanding how these factors relate to each other can help treatment providers identify the treatment methods most likely to work best for a specific individual based …

Using Linked Digital Activity Schedules To Promote Cooperative Thematic Play, Vincent E. Campbell

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Previous research has shown that children with autism spectrum disorder (ASD) may struggle to engage in social play, which may impact their willingness to engage in contextually appropriate cooperative play (Koegel et al., 2014). Researchers suggest that activity schedules targeting cooperative play may increase appropriate play for children with ASD (Brodhead et al.,2014; Pellegrino, 2018). However, previous studies did not include opportunities for interactive choice responding or the implementation of generic picture cues during script training. We investigated the impact of a linked digital activity schedule on promoting cooperative thematic play in children with ASD. Six children with ASD engaged …

The Derivation Of Sodium Density In The Mesosphere And Lower Thermosphere From The Na Lidar Photon Counting Profiles, Xiaoqi Xi

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Derivation of Sodium (Na) number density from the Na lidar observations requires the in situ temperature and wind information because the absorption cross-section of the Na atom is a function of these dynamic parameters. The Na number density above ~ 110 km altitude was difficult to derive with the conventional algorithm, however. The standard output of the Na number density that utilizes the lidar-measured wind and temperature information falls short at ~ 110 km altitude and above due to the relatively large measurement uncertainties in the two critical parameters (low signal-to-noise ratio). Therefore, an innovative algorithm that may drive the …

Development Of Large-Scale Pseudo-3d Shear Wave Velocity Models At The Garner Valley Downhole Array Site, Isabella Corey

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In order to design structures that can withstand anticipated earthquake loads, it is first necessary to understand the behavior of the subsurface when subjected to ground motions. To achieve this, different models and approaches have been proposed in recent decades, each with the aim of estimating how site-specific stratigraphy can amplify and/or scatter seismic waves. All of these methods require, to varying extents, information about the types of soil layers, their thickness, their stiffnesses (represented by a shear wave velocity profile), and lateral variability across the site. This last characteristic is often both difficult and costly to determine. Past research …

Gesture And Language In Children Enrolled In Early Intervention, Makenzy S. Turner

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Language development in preschool-age children is important, as children with early language delays are at risk for difficulties in other areas such as literacy skills, behavioral skills, and social/emotional skills. Gesture has been found to be linked to language skills in young children. This study examined gesture use and language development in a group of young children receiving early intervention services.

This study found that children with language delays at 24 months used fewer gestures during play. Additionally, gesture use was positively associated with other factors that may influence language, such as parent responsiveness and household income. Furthermore, 24-month child …

Using Natural Language Processing To Quantify The Efficacy Of Language Simplification As A Communication Strategy, Brian Nalley

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

People with communication disorders often experience difficulties being understood by unfamiliar listeners or in noisy environments. A common strategy for effectively communicating in these scenarios is to use simpler and more predictable language. Despite the prevalence of this strategy, there has been little to no research to date focused on the effectiveness of language simplification as a communication strategy. This study seeks to begin filling that gap by using natural language processing to determine whether speakers with early-stage Parkinson’s disease and age-matched neurotypical speakers are able to successfully simplify their language while still maintaining the original message.

Simplification was measured …

By Other Means: The Political And Economic Motivations For The Formation Of The Anglo-Japanese Alliance Of 1902 In The United Kingdom, David Cornell

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This thesis is an attempt to answer the question of why British political leaders made the Anglo-Japanese Alliance of 1902. To answer this question, I have used primary sources such as government communications, newspaper articles, and articles from scholarly journals. Also, I have consulted the works of past historians to better understand the complex topic of the Anglo-Japanese alliance. This thesis is divided into three chapters. Chapter One explains the events that led up to the creation of the treaty between Britain and Japan and clarifies why this treaty was so unusual for the British Empire in the early 1900s. …

Physiological Consequences Of Adrenal Enlargement And Implications For Toxin Resistance In North American Snakes, Megen E. Kepas

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The long observed relationship between enlarged adrenal glands and toad-eating in snakes has remained a mystery in physiological ecology and herpetology. It has been predicted that large adrenal glands may be capable of producing higher amounts of key hormones, and that higher plasma hormone levels may lend some behavioral or physiological benefits after a toxic toad has been eaten. I address questions surrounding adrenal enlargement and its potential benefits to toad eaters in four research chapters. In my second chapter, I quantify adrenal hormone output at different embryonic stages in the toad-generalist snake Thamnophis elegans and examine the ability of …

Decolonizing Memory: Erasure And Resurgence Of Indigenous History In The Intermountain West, Chase Wilson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Decolonizing language, memory, and history is an important step in confronting dominant historical narratives in higher education and the general public. This paper focuses on the settlement of the US Intermountain West – where the violent roots of white settlement have been downplayed in the public historical consciousness through the dominant narrative of "pioneer heritage." Beginning with a study of Ogden, Utah, early histories of the area are reexamined, analyzing the contexts in which Native peoples are mentioned (or not) in order to understand their presence by the turn of the twentieth century. Next, my focus moves on to analysis …

An Interval-Valued Random Forests, Paul Gaona Partida

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

There is a growing demand for the development of new statistical models and the refinement of established methods to accommodate different data structures. This need arises from the recognition that traditional statistics often assume the value of each observation to be precise, which may not hold true in many real-world scenarios. Factors such as the collection process and technological advancements can introduce imprecision and uncertainty into the data.

For example, consider data collected over a long period of time, where newer measurement tools may offer greater accuracy and provide more information than previous methods. In such cases, it becomes crucial …

Signatures Of Black Holes, Alexandra B. Chanson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In this defense I will describes three approaches to learn more about the relationship between the dynamics of black-holes and the distinctive signatures of a black hole systems: infinitesimal changes in the black hole background producing field excitations relating new fundamental black hole thermodynamic relations, mechanisms powering relativistic black hole jets and spontaneous symmetry breaking in five space-time dimensions, and physical signatures of black hole event horizons as conformal field theory duals (in both d=4,5 dimensional axisymmetric spacetimes).

Cislunar Navigation Techniques And Navigation Performance Optimization, Quinn P. Moon

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Nova-C is a lunar lander developed by the private company Intuitive Machines to deliver commercial payloads to the Moon. The IM-1 mission set for 2023 will launch and land the Nova-C near the Moon's south pole. In this research, various navigation techniques are explored to determine the lander's position and velocity during key segments. This process is studied for key mission events including trajectory correction maneuvers (TCMs), lunar orbit insertion (LOI), and descent orbit insertion (DOI). Each mission segment, referred to as an Orbit Determination Segment (OD), is analyzed with three different navigation techniques: Monte Carlo Analysis, Linear Covariance Analysis, …

Precipitation And Soil Properties Determine Long-Term Consequences Of Disturbance And Invasion In Drylands, Tyson Terry

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Disturbance and invasive species have dramatic effects on desert plant communities, often resulting in degradation or shifts to alternative plant communities. Climate and soil properties determine water availability to plants, and have been thought to drive patterns of recovery following disturbance and potential for invasion.

In chapter II we used a combination of natural gas pipelines and satellite imagery to understand how recovery from a uniform disturbance differs across precipitation and soil gradients. We used a recovery ratio (disturbed/undisturbed) of pipeline pixels and their undisturbed nearest neighbor pixel to quantify recovery in a comparable way across precipitation gradients. We found …

Developing Firmware For Space Weather Probes 2 Using Hdl Coder, Nicholas L. Wallace

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

GPS and wireless communications are affected by interference from the ionosphere. Space weather affects plasma in the ionosphere, causing communication disruptions and reliability issues. To better understand how space weather affects the ionosphere, instruments are flown in space to collect data about the electrical characteristics of plasma in the ionosphere. Space systems require a lot of time and effort to develop and test. This thesis explores how a high level tool can be used to simplify the process and some obstacles that still exist with developing some space systems. To do this, the firmware architecture of a new version of …

A Scalable, Cost-Oriented Approach For Computing Charge Plans For Electric Bus Fleets, Daniel T. Mortensen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Recent attention for reduced carbon emissions has pushed transit authorities to adopt battery electric buses (BEBs). One challenge experienced by BEB users is extended charge times, which create logistical challenges and may force BEBs to charge when energy is more expensive. Furthermore, BEB charging leads to high power demands, which can significantly increase monthly power costs and may push electrical infrastructure beyond its present capacity, requiring expensive upgrades. This work presents a novel method for minimizing the monthly cost of BEB charging while meeting bus route constraints. This method extends previous work by incorporating a more novel cost model, effects …

Act And Veterans: A Multiple Baseline Study Using Act To Treat Anxiety Disorders In U.S. Military Veterans, Jeremiah E. Fruge

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

There are 18 million Americans, roughly 7% of the population, who are Veterans. In contrast with the general population, Veterans have a high likelihood of exposure to psychological harm during their military service. For example, studies indicate Veterans are diagnosed with anxiety disorders in some cases four times higher than in the general population, though few studies examine treatment. Military culture is an additional factor which is important to account for when treating Veterans. For example, within the military an emphasis is placed on values and committed action which may mean this population will benefit more from certain therapies than …

Opening The Black Box: Soil Microbial Communities In Field-Based Plant-Soil Feedback Experiments, Julia Kate Aaronson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Plant-soil feedback is a process through which plants modify the properties of their associated soils, affecting their growth. PSF can play a key role in regulating plant growth and communities including altering plant invasion, rarity, and abundance. However, our understanding of the soil organisms that drive these plant growth responses is limited. Most studies treat soils as a ‘black box’ and do little to reveal which specific microbes or microbial communities may be responsible. This chapter examines two recent large PSF field experiments conducted in Minnesota, USA, and Jena, Germany. These experiments revealed that plants altered their soils, changing subsequent …

The Influence Of Secondary Principals' Perceived Trust Of Assistant Principals And Central Office Supervisors On Principal Self-Efficacy For Instructional Leadership, Cody J. Reutzel

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Although self-efficacy has been studied widely in education, variables associated with the self-efficacy of principals have received relatively limited attention. The current study investigated the relationship between secondary principals’ perceptions of trust in their assistant principal and central office supervisor and their own self-efficacy for instructional leadership. Surveys were collected from 80 secondary principals. Open-ended questions were utilized to gain greater understanding of the behaviors contributing to principals’ perceptions of trust and feelings of self-efficacy. Data were analyzed using correlation and multiple regression. Quantitative results revealed that no statistically significant relationship is present between trust perceptions in the relationships investigated …

From Flames To Forage: How Wildfire Affects Elk Behavior And Abundance, Megan M. Whetzel

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Rocky Mountain elk (Cervus elaphus nelsoni) is an ecologically and culturally important wildlife species in the Intermountain West, but it is facing habitat changes caused by increasing fire activity. Wildfire frequency is projected to continue to change into the future, yet increases in annual area burned and increases in area burned at high severity may actually represent opportunities for some species. Large herbivores like elk may benefit from increased access to regenerating areas where forage abundance and quality are often elevated. Therefore, effective management of wildlife populations may depend on quantifying how large ungulates, like elk, alter …

Adverse Childhood Experiences, Discrimination, & Adulthood Health Outcomes: Impacts Of Protective And Compensatory Experiences In Childhood, Sallie A. Mack

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Adversity encompasses a wide range of stress-inducing experiences that are often prolonged and/or recurring in nature. Adverse childhood experiences (ACEs) capture adversity experienced before the age of 18, including abuse, neglect, and general household dysfunction. ACEs are widely linked to physical and mental health outcomes across the lifespan. Racial/ethnic discrimination, a form of adversity that can occur across the lifespan, has also been linked to many negative health outcomes. Protective and compensatory experiences in childhood (PACEs) are a relatively newer conceptualization of early-life resiliency factors. Early life resiliency is linked to positive health outcomes later in life. Our studies investigated …

Executive Functioning In Children With Autism And Co-Occurring Neurodevelopmental Disorders: A Systematic Review And Quantitative Analysis, Kandice Benallie

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Children with autism and other NDDs experience some level of executive dysfunction including challenges with problem-solving, judgement, working memory, and flexibility. Considering autism and other NDDs including ADHD and ID have overlapping symptoms, it can be difficult to differentially diagnose the disorders. This dissertation sought to explore how co-occurring ADHD and ID impact the EF of autistic children. The first study systematically reviewed the current research examining EF of autistic children with co-occurring ADHD and ID. Findings suggest that co-occurring ADHD and ID result in increased executive dysfunction as compared to children with autism only. The systematic review also revealed …