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State Legislature Demographics And Anti-Transgender Legislation, Sophie Christensen

Undergraduate Honors Capstone Projects

Starting in 2015, anti-transgender bills have been introduced in state legislatures in exponentially increasing numbers, with a sharp uptick in 2020 and numbers that nearly doubled every year since then. These bills concern a wide variety of issues, from sports participation for transgender adolescents to drag bans to restrictions on bathroom usage. This paper finds that only a small percentage of the bills are passed into law, indicating that passing laws is less important to legislators than introducing bills. Given these intentions, this paper seeks to analyze the demographic makeup of chambers that introduce and pass these bills to understand …

On The Multi-Modal Psychological Experience Of Competence In Youth Sport, Liam O'Neil

All Graduate Theses and Dissertations, Fall 2023 to Present

Over the past half century, beliefs about athleticism (i.e., sport competence) have been thought of as central to motivation for youth sport. In this time, however, these competence beliefs have been narrowly studied which has limited their value in explaining youth sport participation. To expand our understanding of competence beliefs and their motivational significance in youth sport, the three studies of this dissertation tested a longstanding but understudied idea that competence beliefs encompass both judgments of, and emotions about, competence. In Study One, existing research on judgments of competence in youth sport was reviewed. This study showed that many personal …

Game Changing Education: Empowering High School Stem Teachers To Teach Engineering Using Games, Leslie Brown

All Graduate Theses and Dissertations, Fall 2023 to Present

In response to the Next Generation Science Standards (NGSS) released in 2013, there was a nationwide push for K-12 schools to include engineering concepts in science classrooms. However, there is an overall lack of teacher preparedness and training towards engineering topics as shown by common engineering misconceptions. To improve this issue, I initiated a qualitative study to describe the strategies and attitudes of high school science, technology, engineering, and mathematics (STEM) teachers that have implemented game-based, engineering activities into their classroom. Game-based learning is an instructional framework that utilizes game-like elements in a classroom and was used in this study …

Strategies For Increasing Methane Removal In Methanotroph Bench-Scale Systems For The Production Of Ectoine, Jaden Storrer

All Graduate Theses and Dissertations, Fall 2023 to Present

Anthropogenic methane emissions contribute to the greenhouse gas profile which is the chief cause of climate change. One significant source of methane emissions is biogas produced from bacteria in wastewater facilities and landfills. Methane rich biogas has the potential to be valorized into high value bioproducts by using methanotrophs (microbes that use methane as their primary carbon source). Methylotuvimicrobium alcaliphilum 20Z was selected for this study as it can generate ectoine when grown in highly saline environments. Ectoine has been proven to have many benefits such as it prevents protein denaturation, it has hydration properties, and is a UV protectant. …

Aerobic Biodegradation Of Algae-Derived Bioplastics Under Controlled Composting Conditions, Clayton J. Lords

All Graduate Theses and Dissertations, Fall 2023 to Present

Plastics are versatile polymers that have become critically important materials in many industries. Although plastics are important and useful materials, they account for vast amounts of environmental pollution and climate change contribution. Sustainable bioproducts are becoming increasingly important in the effort to mitigate the impacts of pollution and climate change. The scale of environmental damage caused by plastic pollution highlights the need to implement sustainably sourced biodegradable plastics within the global economy. Bioplastics are materials that may be manufactured from biological materials or can biodegrade under certain conditions. Algae are microorganisms that can be grown using nutrient-rich municipal wastewater; the …

Water Use By Irrigated Turfgrass And Connections To Climate And Biophysical Processes, Karem Meza

All Graduate Theses and Dissertations, Fall 2023 to Present

Urbanization and limited water supply and storage result in imbalanced urban water budgets. Quantification of water use becomes important in urban landscapes because urban turfgrass requires a significant amount of water and competes with other urban requirements. Evapotranspiration (ET) plays a crucial role in determining irrigation needs. Credible measurements and spatial estimates of urban turfgrass ET are needed for urban water management. However, these have not been addressed in urban landscapes in arid and semiarid regions. Despite estimating spatial urban turfgrass ET, turfgrass quality linked to ET has not been widely evaluated. Due to different environmental conditions, the driving forces …

Attachment, Emotional Experiencing, And Physiological Response During Couple Interaction, Kyla Iverson

All Graduate Theses and Dissertations, Fall 2023 to Present

In this master’s thesis, I conducted a study using data from 63 hetereosexual couples from a previous research study done by Dr. Ryan Seedall. These couples participated in a micro-intervention where each partner discussed personal issues for three to four minutes while the other received guidance on supportive responses, promoting open communication. Using this data, I conducted a coding project studying the relationship between attachment styles and emotional experiencing, specifically how attachment styles intersect with emotional experiences, moment-to-moment feelings, and physiological arousal. This coding project involved utilizing the Emotional Experiencing Scale (EXP) by Klein and colleagues (1986) to observe couple …

Analyzing Microalgae-Bacteria Population Changes In Response To Environmental Parameters For Improved Wastewater Treatment, Amanda M. Moravek

All Graduate Theses and Dissertations, Fall 2023 to Present

Microalgae are incredible organisms that have a variety of uses such as wastewater treatment, fertilizer, livestock feed, and bio-compound production. Microalgae require a light source and minimal nutrients space to proliferate, making them an environmentally friendly and sustainable option for such processes. The Sustainable Wastes-to-Bioproducts Engineering Center at Utah State University is developing and implementing a Rotating Algae Biofilm Reactor (RABR) to remove total nitrogen and phosphorous from the Central Valley Wastewater Reclamation Facility wastewater effluent. Harmful compounds such as nitrates and phosphates are metabolized by the microalgae and converted into useful bioproducts, resulting in a circular economy. These RABRs …

Seeding Rate, Planting Date, And Herbicides For Dormant Seeded Safflower In Utah, Rodney Daniel Nelson

All Graduate Theses and Dissertations, Fall 2023 to Present

Dryland crop production in the Intermountain West is largely limited by the amount of precipitation received. Increasing dryland safflower (Carthamus tinctorius L.) production yields in a semi-arid climate is possible with a dormant planting but is not well understood. A two-year (2020-22) project was designed to gain an understanding of the effects of variety, seeding rate, and planting date, on dormant seeded safflower. Chemical weed control options for safflower were also evaluated. One study, conducted at three Utah State University research farms near Blue Creek, Clarkston, and Kaysville, UT, evaluated four varieties, S-208, S-333, 7325 and Hybrid-446, seeded at …

Agrichemical Surfactant And Pathogen Impacts On The Blue Orchard Bee (Osmia Lignaria Say, Hymenoptera: Megachilidae), Mary-Kate F. Williams

All Graduate Theses and Dissertations, Fall 2023 to Present

Pathogens that infect commercially reared bee species, such as honey bees and bumble bees, have been extensively studied within the last several years, and studies that explore pathogen impacts on solitary bee health are significantly fewer. Consistent pesticide exposure methods are limited to honey bees and do not outline exposure routes to solitary bees, including how to test chemical impacts on immature stages. My research investigated blue orchard bee survival, development, and immune response following pathogen exposure while simultaneously studying organosilicone surfactant (OSS) exposure and possible synergisms between these two stressors. In my first research chapter (Chapter 2), I define …

A Randomized Controlled Trial Of Self-Help Acceptance And Commitment Therapy And Cognitive Behavioral Therapy For Perfectionism, Emily M. Bowers

All Graduate Theses and Dissertations, Fall 2023 to Present

Many college students are struggling with perfectionism, a tendency to set extremely high standards for themselves, which can lead to stress and dissatisfaction. We looked at whether self-help books based on two different types of therapy, acceptance and commitment therapy (ACT) and cognitive behavioral therapy (CBT), can help reduce unhelpful perfectionism. We looked at how well ACT and CBT self-help books worked for reducing perfectionism, compared to students who did not receive either book. College students in the study completed surveys at the beginning, halfway through, after finishing the book, and again one month later. We found that students who …

Potamogeton Crispus Invasion: Impacts On Native Aquatic Plants And Associated Faunal Habitat, Meghan-Grace Slocombe

All Graduate Theses and Dissertations, Fall 2023 to Present

Aquatic invasive plants are non-native plants that invade a water body and displace native aquatic plants. Invasion depletes the native plant community's ability to provide ecosystem services, including improved water quality, decreased problematic algae, and increased animal habitat. The loss of these ecosystem services reduces the value of fishing, boating, and swimming opportunities in aquatic ecosystems. The potential changes in plant communities and services are particularly important at sites targeted for restoration because project goals typically include increasing ecosystem services, including wildlife habitat. Curly-leaf pondweed (Potamogeton crispus L.) is a problematic invasive species in North America. To better manage …

A Pavlovian, Conditioned-Reinforcement Approach To Reducing Impulsive Choice, Katherine Garland

All Graduate Theses and Dissertations, Fall 2023 to Present

Persistent impulsive choice (the preference for a smaller-sooner over a larger-later reward) is associated with consequential life outcomes. Procedures that reduce nonhuman impulsive choice have long training durations that may reduce their translational utility. The purpose of this experiment was to test a new behavioral intervention to reduce impulsivity that requires few sessions to implement. Delay-bridging stimuli (stimuli presented during the delay to a reward) have been shown to reduce impulsive choice, but delay-bridging stimuli may also be aversive. Conditioned stimuli (CS) established through Pavlovian training are, on the other hand, attractive, potentially even functioning as a conditioned reinforcer (CR). …

Effects Of Light Intensity On Algae Biofilms In Rotating Algae Biofilm Reactors (Rabr), Joshua D. Wintch

All Graduate Theses and Dissertations, Fall 2023 to Present

There is a growing need for economically and ecologically friendly wastewater treatment processes. Utilizing natural algae biofilms to remediate excess nitrogen and phosphorus from municipal wastewater is a treatment technique of academic interest. Utilizing natural algae in rotating algae biofilm reactors (RABR) is a potential engineering application of algae biofilms for municipal wastewater anaerobic digestor effluent treatment. The ideal reactor operation would use sunlight as the light source for algae growth, however, there is little academic research on algae biofilm growth productivity across natural sunlight light intensity ranges. This research seeks to understand the relationship between rotating algae biofilm reactor …

Seasonal And Temporal Influences On Successful Crossing Rates By Ungulates Of A North Utah Wildlife Overpass, Blake Ledbetter

All Graduate Theses and Dissertations, Fall 2023 to Present

Encroachment of human infrastructure fragments wild landscapes and introduces a suite of negative impacts for humans and wildlife. In Utah, roadways threaten migratory ungulates by creating a barrier to movements and preventing access to seasonal migration routes. To mitigate these conflicts, state transportation agencies often install wildlife crossing structures to allow animals to safely cross over or under roadways. Selecting the proper crossing structure requires consideration of the species of interest, landscape, location, and structural dimensions. Often there is balance between the optimal location, the dimensions of the crossing structures, and what is feasible given the landscape. In 2018, the …

Challenging Behavior In Inclusive Postsecondary Education Programs, Samantha J. Nercesian

All Graduate Theses and Dissertations, Fall 2023 to Present

Inclusive postsecondary education programs – higher education programs that are specifically designed for individuals with intellectual disabilities – have grown exponentially in the last 10 years. With this growth has come the emergence of several barriers to inclusive postsecondary education admission and completion. Given the relatively short time inclusive postsecondary education programs have existed, only a small amount of research has looked into barriers that prevent graduation from inclusive postsecondary education programs. One barrier in particular has received little to no attention from researchers – challenging behavior. Challenging behavior is a construct that includes socially inappropriate behaviors, which may harm …

Novel Horticultural Approaches For Reduced Gravity And Controlled Environment Agriculture, Sarah Elizabeth Schreck

All Graduate Theses and Dissertations, Fall 2023 to Present

On July 16, 1969, Apollo 11 achieved the first successful moon landing, marking a significant milestone in human space exploration. This historic moment effectively ended the space race between the United States and the Soviet Union, and since then, countries around the world have continued to advance their space programs. While the space race has evolved, the next major challenge lies in sending humans to Mars—a journey that could take 6 to 9 months each way, presenting numerous challenges, including the critical issue of nutritional sustainment for the crew.

This thesis addresses key aspects of a broader effort to support …

The Effect Of Dietary Protein Source On Gut Health, Spencer Lawson Schow

All Graduate Theses and Dissertations, Fall 2023 to Present

We investigated the impact of protein source in a western-style diet on colon cancer, colitis, and the gut microbiome. The Western dietary pattern is energy-dense, low in fiber, and has a sub-optimal micronutrient profile. Our group has formulated the Total Western Diet (TWD) that emulates the Western dietary pattern using survey data (NHANES), and we have demonstrated that this diet increases gut inflammation and colorectal cancer relative to a healthy control diet (AIN-93G), which is optimized for mouse health. However, the effect of protein source in the TWD and its effects on gut health have yet to be investigated.

Recent …

Analyzing Sedentism In The Built Environment: A Case Study In Archaeological Geophysics At Boundary Village, Uintah County, Utah, Alix Sofie Piven

All Graduate Theses and Dissertations, Fall 2023 to Present

This thesis presents a case study that evaluates the ability of near-surface remote sensing to generate archaeological data suitable to answer questions about human behavior. Specifically, this project assesses the ability of two remote sensing methods, ground-penetrating radar (GPR) and magnetic gradiometry to resolve subsurface archaeological features that are markers of sedentism. In this study, the markers of sedentism are features of village sites where their variability is linked to the anticipated and actual length of time spent occupying a domestic site. A comparative dataset was generated to assess how specific subsurface archaeological features would look in GPR and magnetic …

Uv-A Light And Heat-Activated Antimicrobial And Biodegradable Materials For Food Packaging And Preservation, Michael J. Bodily

All Graduate Theses and Dissertations, Fall 2023 to Present

Current food packaging materials are often non-biodegradable and harmful for ingestion, which poses a threat to the environment and public health. Thus far, the dangers of microbial contamination of food on human health have outweighed the risks associated with using these conventional packaging plastics. A possible solution to these issues is to use a combination of innovative materials and microbial inactivation methods that can potentially both reduce plastic waste and combat harmful microorganisms. In this study, two antimicrobial, biodegradable composites were developed and tested for their ability to inactivate two types of bacterium, Escherichia coli K12 and Listeria innocua, …

Managing For Disturbance: Trade-Offs Associated With Population Resilience And Ecosystem Size, Ellie Wallace

All Graduate Theses and Dissertations, Fall 2023 to Present

Populations can recover from and withstand disturbance through characteristics such as reproduction and maintaining large abundances. While these traits are beneficial to native species conservation, they can simultaneously challenge effective invasive species management. Effective invasive species control requires sufficient efforts to overcome a population's ability to recover from disturbance, such as harvest. My dissertation aimed to address how the size of an invasive population and its ability to recover from disturbance impact a suite of invasive species control methods, including those that (1) target mainly larger and older individuals (i.e., mechanical removal), (2) target all sizes of individuals (i.e., targeted …

Greater Sage-Grouse Habitat Dynamics And Grazing, A Study Of Vegetation Indices And Survival, Codi R. Backen

All Graduate Theses and Dissertations, Fall 2023 to Present

North American rangelands are vast, open landscapes that support diverse ecosystems and provide many ecosystem services. Many wildlife call sagebrush rangelands home, including the Greater sage-grouse (sage-grouse; Centrocercus urophasianus). Sage-grouse habitat encompasses 165 million acres across western North America, and this bird has been of conservation concern as their populations drastically declined since the 1960s. Rangelands are also grazed by livestock, which has the potential to negatively affect sagebrush ecosystems when overgrazed or overstocked, which could be detrimental to sage-grouse nesting habitat. Additionally, sagebrush rangelands undergo annual variations in precipitation, temperature, growing season length, and vegetation vigor, which has …

The Impact Of Visually Presented Distractor Taboo Words During A Bilateral Attention Task, Chloe Taylor

All Graduate Theses and Dissertations, Fall 2023 to Present

Attention is a limited resource. Some events are able to capture one’s attention more efficiently than others, such as swear or sexual words. These events have preferential access to attentional resources and increase our arousal levels due to the activity of a neurotransmitter called norepinephrine. We investigate how well swear/sexual words capture peoples’ attention and interpret these effects in terms of norepinephrine activity.

Participants performed a visual task where they responded to different shapes presented while ignoring neutral or swear/sexual words presented on opposing sides of the computer screen.

Participants were significantly more inaccurate in identifying the shape present when …

Disentangling Factors Contributing To Population Performance Of Zion Bighorn Sheep, Ian Montgomery

All Graduate Theses and Dissertations, Fall 2023 to Present

Bighorn sheep populations across the western United States face increasing challenges from habitat loss, disease, and predation. In Zion National Park and surrounding areas, survey-based estimates indicate that the desert bighorn sheep population declined from over 800 individuals in 2018 to fewer than 500 in 2021. Understanding what drives these population changes is critical for effective wildlife management and conservation. This research examined key factors influencing population growth and individual survival to inform strategies for recovery in this bighorn population.

First, we analyzed which vital rates contributed most to population trends by estimating survival and reproduction rates from ground and …

Optimizing Nutrient Recycling To Achieve Zero–Discharge Management For Controlled Environment Agriculture, Noah James Langenfeld

All Graduate Theses and Dissertations, Fall 2023 to Present

Controlled environment agriculture (CEA) allows for human control of one or more environmental factors affecting crop production. Optimizing nutrient management in such systems allows for translation and predictions of sustainable management strategies in the field. These systems will be used to supply fresh food as public and private space agencies are planning to send humans to the Moon and Mars in the near future. Food resupply becomes increasingly difficult as the distance from Earth increases. Plants can be grown off-Earth as a food source, but their growth must be carefully managed to ensure long-term sustainability. I describe a model used …

Development Of The Sexual Mindfulness Measure For Abstinent Persons, Kaitlyn Zito

All Graduate Theses and Dissertations, Fall 2023 to Present

Sexual wellbeing plays a crucial role in overall health, influencing physical, emotional, social, and even spiritual aspects of life. One key factor in sexual wellbeing is sexual mindfulness, or the ability to be aware and accepting of one's sexual thoughts, feelings, and sensations. While previous research has focused on sexual mindfulness in romantic relationships, little is known about how it applies to abstinent individuals. To address this gap, I developed a 16-item validated measure of sexual mindfulness specifically for abstinent individuals: the Sexual Mindfulness Measure for Abstinent Persons (SMM-AP). This tool adapts key elements from the Five Facets of Mindfulness …

"Once Our Land Is Gone, It's Gone": Farmer Perspectives On Growth, Embeddedness, And The Future Of Food In The Great Salt Lake Basin, Bryn Noelle Watkins

All Graduate Theses and Dissertations, Fall 2023 to Present

The Great Salt Lake Basin hosts a knot of intensifying pressures on agriculturalists—including economic constraints, as even arable land is increasingly valuable for development, and ecological constraints, as aridification and climate change affect the conditions in which food can grow. Given the unique relationship farmers have with the land as its modern-day stewards, their perspectives on the nature and consequences of these pressures offer profound insights into how the region might responsibly navigate its resource management and food systems moving through the future. In the first paper, I draw upon 15 interviews with commodity farmers to understand their experiences with …

Effects Of Plant Biostimulants On Onion Growth And Production Under Greenhouse And Field Conditions, Prakriti Nepal

All Graduate Theses and Dissertations, Fall 2023 to Present

The escalating impact of climate change on agricultural production underscores the need to investigate sustainable crop enhancement methods. This research explores the use of plant biostimulants to grow onion (Allium cepa L.) under varying environmental conditions. In the initial germination and greenhouse screening, seven biostimulants were tested on ‘Vaquero’ onion seeds: three bacterial products (Continuum, Spectrum DS, and Tribus Original), two mycorrhizal products (Mighty Mycorrhizae and Myco Apply), one seaweed extract product (Seaweed), and one product containing humic acid (Huma Pro 16). Mighty Mycorrhizae, Continuum, and Myco Apply supported faster germination, while seeds treated with Spectrum and Seaweed took …

Understanding The Impact Of Colloidal Calcium Phosphate On The Ph Variation In Cheddar Cheese During Early Stages Of Aging, Rachel Lindstrom

All Graduate Theses and Dissertations, Fall 2023 to Present

The Cheddar cheese industry has recently observed variation in the pH of their cheese during the early stage of storage. This variation may be due to the addition of the faster acid producing thermophilic starter culture Streptococcus thermophilus which was recently introduced into the Cheddar cheese making process. This starter culture may impact the calcium buffering properties of the cheese due to more retention of the insoluble calcium (INSOL Ca) within the cheese. To investigate this problem, we studied how insoluble calcium affects cheeses with pH ranging from 4.8 to 6.6 and found that INSOL Ca was positively correlated with …

Gone With The Flow: Flow Reduction Coincides With Reduced Metabolism And Standing Stock Of Benthic Algae And Macroinvertebrates In Desert Rivers, Chloe E. Lyles

All Graduate Theses and Dissertations, Fall 2023 to Present

River metabolism, the measure of energy flow in a river, is driven by hydrological and physicochemical regimes (e.g., temperature, turbidity, and nutrients). However, these regimes are increasingly altered by human water demand and climate change-driven drought. These stressors alter the magnitude, timing, and duration of critical spring-snowmelt floods with poorly understood consequences on ecosystem function, particularly in desert rivers. To investigate the linkages between flow reduction, river metabolism, and basal food resource productivity (i.e., algae and aquatic invertebrates), we measured metabolism and basal resource availability in seven desert tributaries with varying degrees of flow reduction during low-flow conditions in 2023 …