Digital Commons Network^™

Evaluation Of Oocyte Developmental Competence And Potential Strategies To Improve Oocyte Quality, Min Yang

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Assisted reproductive technologies (ARTs) have now been extensively used to promote reproductive efficiency as a fertility treatment not only in human medicine but also animal reproduction. ARTs serve as an important tool to advance the fundamental knowledge of reproductive processes. The quality of female’s eggs defines its ability to undergo maturation, fertilization, and development. This quality is determined by various factors and is crucial for the success of ARTs. Any alternations happening during the egg growth and maturation process can result in the decreased quality, which could have long-lasting effects on development. Improving the developmental efficiency of the egg is …

Three Environmental Fluid Dynamics Papers, Eden Furtak-Cole

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Three papers are presented, applying computational fluid dynamics methods to fluid flows in the geosciences. In the first paper, a numerical method is developed for single phase potential flow in the subsurface. For a class of monotonically advancing flows, the method provides a computational savings as compared to classical methods and can be applied to problems such as forced groundwater recharge. The second paper investigates the shear stress reducing action of an erosion control roughness array. Incompressible Naiver-Stokes simulations are performed for multiple wind angles to understand the changing aerodynamics of individual and grouped roughness elements. In the third paper, …

Utilizing A School-Based Treatment To Address Socially Anxious Elementary School Students, Mckell Nelson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Despite the availability of promising clinic-based programs, youth exhibiting socially anxious behaviors rarely receive the treatment they may need. Those that do get treatment, often do so in the school setting. Thus, the demand for effective interventions to address those needs in the school-setting is growing. The present study investigated the effects of a modified CBT intervention, delivered in the school setting, on positive peer interactions and self-rating social anxiety. Results showed that the treatment package provided an increase in positive peer interactions across all four participants, as well as a decrease in self-rated anxiety behaviors.

Examining The Effect Of A School-Based Treatment On Anxiety For Latino Students, Emilie J. Larsen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study examined the efficacy of a brief culturally and instructionally modified cognitive behavioral therapy program for five anxious Latino/a youths ages 8-11 years in an elementary school setting. Each student exhibited anxiety in a classroom setting as reported by their teachers and parents or guardians. A noncurrent multiple baseline design was implemented using A-B replications to assess the effects of baseline and treatment on daily self-report student distress ratings as well as daily teacher rated distress, academic engagement, and work completion. All participants completed the Revised Children’s Manifest Anxiety Scale-2 pre- and post-treatment as well as a Children’s Intervention …

Phenology Of A Southern Population Of Mountain Pine Beetle (Dendroctonus Ponderosae), Anne Elise Mcmanis

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Mountain pine beetle (Dendroctonus ponderosae, Hopkins) is a major disturbance agent in pine ecosystems of western North America. Adaptation to local climates has resulted in primarily univoltine (one generation per year) generation timing across a thermally diverse latitudinal gradient. We hypothesized that this pattern in total development time is shaped by selection for slower developmental rates, altered developmental thresholds, or oviposition rates in southern populations inhabiting warmer climates. To investigate traits responsible for latitudinal differences we measured lifestage-specific development of southern mountain pine beetle eggs, larvae and pupae across a range of temperatures. We also describe and model …

Marginal Mediation Analysis: A New Framework For Interpretable Mediated Effects, Tyson S. Barrett

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Mediation analysis is built to answer not only if one variable affects another, but how the effect takes place. However, it lacks interpretable effect size estimates in situations where the mediator (an intermediate variable) and/or the outcome is categorical or otherwise non-normally distributed. By integrating a powerful approach known as average marginal effects within mediation analysis—termed Marginal Mediation Analysis (MMA)—the issues regarding categorical mediators and/or outcomes are, in large part, resolved. This new approach allows the estimation of the indirect effects (those effects of the predictor that affect the outcome through the mediator) that are interpreted in the same way …

Evaluation Of A Side-By-Side Full-Scale Biofiltration Conversion In A Nutrient-Limited Environment, Stetson S. Bassett

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In order to meet increasing water demands and more stringent regulations drinking water treatment plant managers must continually look to new treatment strategies and optimization techniques. One such strategy is to eliminate chlorine residual before filtration, allowing indigenous bacteria already present in the source water to grow on the filter media. These microorganisms help improve effluent water quality by increasing organic and inorganic contaminant removal. The process is known as biological filtration, or biofiltration. The implications of converting a conventional filtration plant (not specifically designed for biofiltration) to a biofiltration plant are still not well understood. Therefore, the purpose of …

Integrated Systems Modeling To Improve Watershed Habitat Management And Decision Making, Ayman H. Alafifi

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Existing river management tools prioritize human uses and provide for ecosystem water needs as minimum instream flow requirements. Management efforts to provide water for multiple human and ecological needs can be improved by tools that recommend when, where, and how to allocate water between competing users across a river basin. This dissertation presents a set of tools in three studies to help managers make decisions on the allocation of water and money to improve habitat quality and area. The first study develops a new metric to measure habitat quality and area for priority river, riparian, and wetland species. The second …

Effect Of High Intensity Ultrasound On The Crystallization Behavior Of Interesterified Fats, Jeta Vijay Kadamne

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The process of partial hydrogenation produces trans fats and the fats that undergo this process are called partially hydrogenated fats (PHF). Clinical studies have shown a strong association between PHF and coronary heart diseases. In 2015 The U.S. Food and Drug Administration removed the Generally recognized as safe or "GRAS" status of PHF. These fats were used in confectionary, margarines, shortenings, doughnuts, cookies, cakes, etc. The PHF serve a function in food by providing a higher shelf life and a desired harder structure due to their higher melting point. Hence, the food industry is currently looking for PHF alternatives which …

Changing Nonhuman Impulsive Choice, C. Renee Renda

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Preference for smaller-sooner over larger-later rewards characterizes one type of impulsivity—impulsive choice. Impulsive choice is related to a number of maladaptive behaviors including substance abuse, pathological gambling, and poor health behaviors. As such, interventions designed to reduce impulsive choice may have therapeutic benefits. The purpose of this dissertation was to explore two methods to change nonhuman impulsive choice. In doing so, we hope to provide a baseline that future research can use to assess variables that are less amenable to human research (e.g., drug self-administration following reductions in impulsive choice). In Chapter 2, we failed to reduce nonhuman impulsive choice …

Does Neighborhood Context Matter? A Multilevel Analysis Of Neighborhood Disadvantage And Sleep Health, Carlyn E. Graham

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Childhood is one of the most important stages for physical and cognitive growth during the life course. For young children, sleep is one of the major contributors to healthy development; poor sleep quality and short sleep duration can detrimentally affect developmental progress. In addition to physiological contributors to poor sleep, social factors may affect young children’s sleep. Prior findings suggest that demographic and socioeconomic characteristics, such as race and parent’s educational attainment, may contribute to sleep health for children. Furthermore, limited prior research suggests that neighborhood attributes may affect sleep for both children and adults alike. To my knowledge, no …

Assessing Homeowners' Lawn Management Practices And Preferred Sources Of Educational Information, Candace J. Schaible

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Prior to the development of programing and outreach materials it is important for Extension outreach and education professionals to assess the educational needs and preference of the communities they serve. Survey data was gathered from residents of Cedar City, UT, in an effort to gain an understanding of current lawn management practices and the resources homeowners utilize when making management decisions. In addition, soil samples were collected from a subset of participants to compare nutrient levels to management practices.

Survey results found that homeowners accessed multiple sources, with preferences leaning towards the use of friends and family members, the internet, …

Elucidating Molecular Interactions Of Shigella Type Three Secretion System Components Critical For Pathogenesis, R. Alan Burgess

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Shigella are pathogenic bacteria which commonly infect human hosts through the fecal-oral route. As the causative agent of shigellosis, a disease characterized by severe diarrhea, nausea, and vomiting, Shigella are responsible for an estimated 90 million infections and 100,000 deaths each year. With the emergence of antibiotic resistant strains of Shigella, the need for alternative treatments methods has become critical to fighting outbreaks of shigellosis and drug resistant strains. One such method is to target the infection system of the bacteria, called the type three secretion system (T3SS). The T3SS includes a complex needle and syringe-like apparatus that is …

A Qualitative Analysis Exploring The Development Of Problematic Sexual Behaviors In Adolescent Males With Developmental Disabilities, Maria J. Watters

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Adolescents with developmental disabilities (DD) experience regular physical and sexual development. Some adolescents with developmental disabilities engage in problematic sexual behaviors (PSB). In order to be able to address the needs of this population in terms of prevention of PSB, and provision of effective treatment after PSB has begun, their experience must be understood and contributing factors identified. It is with this in mind that this study was designed, with the purpose being the exploration of the experiences of adolescents with DD who have engaged in sexually problematic behaviors, including compulsive or addictive patterns of behavior, and to identify the …

Characterization Of Black Walnut Genotypes For Resistance To Thousand Cankers Disease, Frost Hardiness And Other Desirable Horticultural Traits, J. Elisa Lauritzen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The black walnut, Juglans nigra L., is native to the United States (USA) and is a valuable timber and nut tree. Just before the beginning of the 21st century, several western states observed a decline in the health and, later, death of black walnut trees. The pathogen-vector complex now known as thousand cankers disease (TCD) was shown to be the cause. The disease, caused by Geosmithia morbida Kolařik, is vectored by the walnut twig beetle (WTB), Pityophthorus juglandis Blackman. Thousands of WTB will swarm and enter a tree vectoring the fungus at each entry point where cankers then develop, quickly …

Facilitators Of Diné (Navajo) Student Access, Enrollment, And Persistence In Postsecondary Education: An Ecological Systems Perspective, Christina Hartman

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Diné (Navajo) students drop out of high school and postsecondary education at higher than average rates. The purpose of this study was to investigate how Diné students currently enrolled in college describe the factors that supported their pursuit of higher education. Bronfenbrenner’s ecological systems theory was used as a framework and to identify and analyze factors that influence access, enrollment, and participation in higher education. The Diné participants in this study were six students enrolled in postsecondary education at the time of this research, recruited from two university campuses in the Southwestern U.S. Each student participated in a semistructured interview …

Telepsychotherapy For The Treatment Of Trichotillomania: A Randomized Controlled Trial, Eric B. Lee

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Trichotillomania is defined as recurrent pulling of one’s hair that results in distress and negative effects on general functioning and quality of life. Estimates of trichotillomania lifetime prevalence generally range from approximately 1% to 3% and it is likely as common as disorders such as obsessive-compulsive disorder and agoraphobia. Yet, quality treatment for trichotillomania is often difficult to find as many mental health professionals are uninformed about the disorder and its treatment. Moreover, mental health services in general are inaccessible to many with estimates suggesting that 96.5 million people do not have access to adequate services. The use of telepsychology …

Three Essays In Economics Of Prey-Predator Relation, Dong-Hun Go

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This dissertation explores how natural ecosystem can be integrated with economic system through two case studies of multiple species interactions, or predator-prey relations. By the inclusion of biological, ecological and economic aspects, the integrated approaches aim at more clearly understanding of how regional ecosystem and economy interact with each other, given threats of resource extinction and environmental shock. I also explain strategies and policy regimes that can be considered to achieve efficient and sustainable ecosystem management in those circumstances.

The first case study focuses on a predator-prey relation in the Pacific Ocean between the United States and Canada, where endangered/threatened …

A Model For Bioaugmented Anaerobic Granule, Amitesh Mahajan

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In this study, we have created a simulation model which is concerned about digesting cellulose, as a major component of microalgae in a bioreactor. This model is designed to generate a computational model that simulates the process of granulation in anaerobic sludge and aims to investigate scenarios of possible granular bioaugmentation. Once a mature granule is formed, protein is used as an alternative substrate that will be supplied to a mature granule. Protein, being a main component of cyanobacteria, will promote growth and incorporation of a cell type that can degrade protein (selective pressure). The model developed in a cDynoMiCs …

They Have No Ears To Hear My Pleas: Short Stories Of The Post-Apocalypse, Keoki W. Kemp

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This is a creative thesis consisting of two short stories in the post-apocalyptic genre. A genre that highlights suffering, societal trauma, and the effects of trauma and loss on the human psyche. This genre asks the reader to be sympathetic to these extreme plights. Post-apocalyptic narratives also feature classic heroes who come out on top, despite the genre’s harrowing settings. The two stories featured in this creative thesis are an answer to my inquiry into the genre and seeks not only to show what makes post-apocalyptic literature entertaining but also worthy of literary merit.

The two short stories that constitute …

Using Social Cues To Influence Fruit And Vegetable Intake In College Students, Elizabeth A. Nix

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

People often base their behaviors on social norms—what they think others do or approve of. This is likely true of fruit and vegetable (FV) intake as well. College students typically don’t get enough FV. We attempted to encourage FV eating by providing students with messages or demonstrations that eating FV is normal. First, we tried to encourage FV intake by providing students with messages regarding the average skin carotenoid concentration and where they fit within their peers (Chapter II). Carotenoids are compounds found in FV that cannot be made by the body, making them an estimate of FV intake. We …

Be Cool, Stay In School: The Habits, Resources, And Confidence College Students Need To Succeed, Matthew Staheli

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Earning a college degree yields many benefits. In addition to an increased income, college degree earners generally have greater job satisfaction, make healthier life choices, are better communicators, and have greater social mobility. Even with all of these benefits, however, some colleges are seeing graduation rates as low as 32%. One of the greatest contributing factors affecting the dropout rate of undergraduate college students is poor academic performance in their courses. In this study, we sought to identify several academic resources, study behaviors, academic self-confidence scores, and demographic information to assess what types of behaviors and resources may lead to …

Latent Difference Score Mediation Analysis In Developmental Research: A Monte Carlo Study And Application, Melissa Simone

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Developmental and prevention researchers aim to determine how unhealthy behaviors emerge. Mediation analysis offers a statistical tool that allows researchers to describe the processes underlying early risk and later health outcomes. Among existing longitudinal mediation models, latent difference score mediation stands out due to its unique ability to capture variations in changes both within and across individuals, as well as its ability to examine non-linear change over time. However, the literature currently lacks sample size guidelines for latent difference mediation models, which has proven to make the use of these models difficult. The current project addresses this limitation by offering …

Lifetime Estrogen Exposure And Brain-Derived Neurotrophic Factor: Implications For Cognitive Decline In Late Life, Joshua M. Matyi

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Cache County Study on Memory in Aging (CCSMA) is a longitudinal population-based study which took place in Cache County, Utah. The study followed 5092 older-adult residents (aged 65+) for approximately 12 years to examine risk and protective factors for dementia. Participants completed dementia screening and follow-up assessments across four triennial visits. Additionally, researchers gathered information regarding demographics, reproductive history (e.g. age of menopause; hormone replacement therapy [HRT]) and other health-related factors, such as physical activity. Genotyping of DNA was completed for a genetic variation of genes for brain-derived neurotrophic factor (BDNF), a protein found in the brain associated with …

Investigations Of Polyhydroxyalkanoate Secretion And Production Using Sustainable Carbon Sources, Chad L. Nielsen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Polyhydroxyalkanoates (PHAs) are a type of biologically-produced plastic known for their biocompatibility and biodegradability. They have the potential to replace petroleum-based plastics as an environmentally-friendly alternative. This is beneficial because the release of plastics into environments such as the ocean and the buildup of plastics in landfills are major concerns facing society today. Currently, however, PHAs are significantly more expensive than their petroleum-based counterparts. This is largely due to the cost of carbon sources and of extracting the bioplastics from bacteria. The goal of these studies was to examine replacing traditional carbon sources used in PHA production like sugar and …

Motor Affordance For Grasping A Safety Handle, Doug W. Mcdannald

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

Observation of objects in our environment can potentiate movement, a fact reflected by increased activity in motor cortical networks when participants simply view a graspable object. This suggests that specific areas in the motor cortex play an important role in processing visual information to rapidly determine an appropriate action. The present study was conducted to test if visual access to a wall-mounted safety handle results in activation of motor cortical networks. We hypothesized that the hand area of the primary motor cortex would be facilitated shortly after visual access to a safety handle versus when no handle was visible. To …

Skill Builder: Assistive Technology For Developing Skill And Habits, Aaron Kay

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

The Skill Builder application is assistive technology for helping individuals build skills through reminders and self-reporting feedback. The application has been built to support Android and iOS devices and followed a user-centric design methodology. Skill Builder’s architecture and development processes are set forth using cross-platform development environments and a native software development kit for the three different versions of the application that were built. The strengths and weaknesses of each of the platforms are explored.

Several studies have been proposed for helping individuals with different needs learn the skills to cope with their challenges. Applications of Skill Builder include students …

Assessing Variation In Air Quality Perception: A Case Study In Utah, Karen Jayne Mendenhall

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

In recent years, Utah has experienced poor air quality due to pollution-trapping winter inversions and summer ozone pollution. The resulting impacts of poor air quality include health issues, reduced visibility, economic impacts and ecological impacts. Utah’s topography and exploding urban population are factors which increase human exposure to these adverse impacts of air pollution. It is important for State and local governments to understand how people perceive air quality so that clean air campaigns target those who are most likely to foster pro-environmental behaviors. An analysis was conducted using data from a state-wide survey conducted in July 2017. The survey …

Pruning Strategies For High Density ‘Montmorency' Tart Cherry, Sheriden M. Hansen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The tart cherry (Prunus cerasus) is the most significant fruit tree crop in Utah, accounting for roughly 51% of the total statewide commercial fruit acreage. In order to accommodate harvesting equipment, tart cherries are grown in conventional orchards with large trees spaced up to 5.5 meters apart. New methods of harvest are adapted to smaller trees in tighter spaced high density (HD) orchards. HD orchards bear fruit earlier in the orchard life than conventional orchards, but likely require different pruning and management strategies, which have not yet been determined for tart cherry. Experimental HD orchards were used to …

Low Offspring Survival In Mountain Pine Beetle Infesting The Resistant Great Basin Bristlecone Pine Supports The Preference-Performance Hypothesis, Erika L. Eidson, Karen E. Mock, Barbara J. Bentz

Wildland Resources Faculty Publications

The preference-performance hypothesis states that ovipositing phytophagous insects will select host plants that are well-suited for their offspring and avoid host plants that do not support offspring performance (survival, development and fitness). The mountain pine beetle (Dendroctonus ponderosae), a native insect herbivore in western North America, can successfully attack and reproduce in most species of Pinus throughout its native range. However, mountain pine beetles avoid attacking Great Basin bristlecone pine (Pinus longaeva), despite recent climate-driven increases in mountain pine beetle populations at the high elevations where Great Basin bristlecone pine grows. Low preference for a potential …