Digital Commons Network^™

Comparing Conventional And Noninvasive Monitoring Techniques For Assessing Cougar Population Size In The Southern Greater Yellowstone Ecosystem, Peter D. Alexander

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Determining the abundance or density of wildlife populations is needed for informed decision-making by wildlife biologists. Cougars (Puma concolor), however, are a highly secretive species occurring at very low densities across the landscape, and thus their populations are difficult for biologists to accurately assess. The conventional, and most trusted, method entails physically trapping and radio-collaring as many cougars as possible in a population, and then performing a simple count to determine a minimum population size. While accurate, this method is prohibitively expensive, logistically challenging, and behaviorally disruptive to the study animal. Many noninvasive surveying techniques, such as camera …

Anaerobic Hydrogen And Methane Production From Dairy Processing Waste: Experiment And Modeling, Jianming Zhong

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Dairy processing waste (DPW) is the waste produced from manufacturing dairy products: cheese, yogurt, ice cream, milk, butter, etc. DPW is high in chemical oxygen demand (COD) due to its lactose, fat and protein content, and therefore needs to be appropriately treated. An investigation was conducted to produce energy (hydrogen and methane) from DPW by anaerobic digestion. This project developed an effective engineering method for stable methane production from DPW without adding pH control chemicals. This study also explored the optimal operational condition for hydrogen production from DPW. We further built a mathematical model to help us monitor and predict …

Greater Sage-Grouse Vital Rate And Habitat Use Response To Landscape Scale Habitat Manipulations And Vegetation Micro-Sites In Northwestern Utah, Charles P. Sandford

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The greater sage-grouse (Centrocercus urophasianus; sage-grouse) has been a species of conservation concern since the early 20^th century. The decline of populations has largely been attributed to loss and degradation of sagebrush (Artemisia spp.) habitats. To contribute to the knowledge of sage-grouse ecology and quantify the effectiveness of landscape scale habitat manipulations intended to benefit sage-grouse, I monitored habitat use and vital-rates (i.e., nest and brood success) of 45 sage-grouse females in the Box Ender Sage-Grouse Management Area (SGMA) in northwestern Utah. Using telemetry locations of sage-grouse females with known nest and brood fates, I generated …

Investigation Of The Tailoring Steps In Pradimicin Biosynthesis, Kandy L. Napan

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This research focused on the investigation of the late steps in the biosynthetic pathway of the novel antifungal and antiviral pradimicins A-C. Pradimicins were first isolated from the soil bacterium Actinomadura hibisca. These bioactive molecules are assembled by a type II polyketide biosynthetic pathway. Although the biosynthetic gene cluster of pradimicin has been identified, the functions of the biosynthetic genes and how they work collaboratively to form the final structures of pradimicins remain unknown. This research aims to functionally characterize the enzymes involved in the late steps of the biosynthetic route.

The early biosynthetic steps of pradimicins have been …

Motionscan: Towards Brain Concussion Detection With A Mobile Tablet Device, Shantanu Saxena

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This thesis reports on a study to determine the viability of using a mobile tablet device as a brain concussion detection tool. The research builds upon the results of a prior method of collecting data for measuring motion sensitivity, where a user presses and releases a force sensor to balance a rising and falling line on a computer display. The motion sensitivity data collected using this force sensor device was shown to have less irregularity in persons with concussion. The MotionScan application, developed for this research, uses the accelerometer of a tablet device to record motor movement of a user …

The Market Potential For Food And Agricultural Tourism In Utah, Miranda Bradshaw

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Tourism is one of the largest and most economically important industries in Utah. Local businesses and government agencies may increase their tourism-related profits through targeted marketing and product development. As tourists may differ from one another in terms of trip planning, party size, the activities they participate in, and more, it is important to understand who tourists are. The primary research purpose of this study was to explore and better understand the different types of tourists who visit Utah.

Data on tourists were collected through an in-person survey. This data was then used to place tourists into groups according to …

Modulation Of The Nutritional Context And Early Experience As New Tools To Increase The Use Of Medusahead (Taeniatherum Caput-Medusae Ssp. Asperum) By Grazing Sheep, Juan J. Montes

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Medusahead is an invasive weed that reduces wildlife habitat and biodiversity as well as commercial and recreational value of land. Grazing represents a sustainable method for its control but stakeholders claim that livestock will not eat medusahead because of its low feed value. This research explored a supplementation program, along with experiences early in life with mother to enhance use of medusahead by sheep. Results showed that an energy supplement did not enhance medusahead use by sheep but that early experience with mother influenced yearlings to use the weed more evenly across days. When availability of the weed was low …

Developing A Method For Quantifying Nitrogen Transformation Rates Using In Situ Benthic Chambers Dosed With Isotopically Labeled Nitrate, Chelsea A. Stewardson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Nitrogen, a nutrient required for biological growth, is a common water quality parameter of concern as too much nitrogen can cause a strain on aquatic environments and even death of plants and animals. One way high levels of nitrogen are introduced into aquatic systems is by anthropogenic sources such as effluent from water reclamation facilities. A method was designed to observe the fate of nitrogen and measure the rates of its transformation into different nitrogen species within a stream receiving the effluent from the Silver Creek Water Reclamation Facility in Park City, Utah.

Sealed chambers were designed and installed along …

Establishment And Trends In Persistence Of Selected Perennial Cool-Season Grasses, Craig W. Rigby

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The choice of plant materials is an important factor in restoration or revegetation of disturbed rangelands. To better identify plant materials that could be adapted to increased competition from invasive grasses and fluctuations in temperature and precipitation, there is a need to understand potential seedling establishment, plant persistence, and dry-matter yield (DMY) as a measure of plant vigor in the newly developed varieties across a wide range of environmental conditions. Experiments were conducted on four semiarid range sites to compare these traits in 14 perennial cool-season grass species currently used for revegetation in the Western U.S.A. There were location differences, …

Utah Lotus: North American Legume For Possible Use In Rangeland Revegetation In The Southern Great Basin Of The Western United States, Jason M. Stettler

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This thesis project explored the production and forage quality characteristics of Utah lotus (Lotus utahensis Ottley) and scrub lotus (L. wrightii (A. Gray) Greene) seed collections during a two-year period. The variation of 14 Utah lotus and five scrub lotus seed collections was evaluated by measuring important plant characteristics at three common garden sites in northern Utah. In addition, the genetic structure of the collections was determined by molecular biological techniques. Large variation was observed among collections for all phenotypic traits measured, with Utah lotus and scrub lotus being phenotypically quite different. Two collections of Utah lotus (LU-5 …

The Art Of Devotion: Style, Culture, And Practice In Mid-Nineteenth-Century Kashmir, Nina Cavazos

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Largely produced in the Kashmir Valley during the mid-nineteenth century, gutkas are pocket-sized anthologies of texts, hymns, and prayers that a Hindu would recite in a sacred place in the home, usually near an altar. In the past, these objects have been relegated to the periphery of art historical discourse due to scholarly discriminations against their unrefined, "folk" characteristics. However, despite the lack of academic interest, a critical study of gutka culture provides the ideal viewpoint from which to explore South Asian art history, cultural history, and historical Hindu practices. Although these objects were often left unsigned by their illiterate …

Influence Of Disturbance On Greater Sage-Grouse Habitat Selection In Southern Utah, Erica P. Hansen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The greater sage-grouse (Centrocercus urophasianus; sage-grouse) is a species of conservation concern that occupies sagebrush-dominated (Artemisia spp.) landscapes across the western United States and southern Canada. The U. S. Fish and Wildlife Service (USFWS) reviewed the status of the sage-grouse in September 2015 and determined that it did not warrant protection under the Endangered Species Act due to collaborative efforts between numerous public and private stakeholders. However, this decision hinged on federal and state commitments to continue science-based management of sagebrush habitats. As human development increases across the west, there is an increasing need for understanding …

“Touched By Time”: Geopolitical Themes Of Estonian National Identity Through Folklore And Song Festivals, Mandy L. Hoggard

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Estonian national identity—how Estonians imagine their values, history, and place in the world—is defined by their centuries-long struggle for independence and autonomy. This thesis examines the struggle and resulting identity through the lens of the laulupidu, or song festival, and its employment as a vehicle of political mobilization and re-constructor of Estonian history. Regarding folklore, in this case festivals and folk songs, as containers of the soul of the nation, I show how Estonians have produced and reproduced their national identity through the practice which they hold sacred: choral singing. I implemented a critical geopolitical approach, which emphasizes the …

The Role Of Gpr84 In Medium-Chain Saturated Fatty Acid Taste Transduction, Yan Liu

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The prevalence of overweight or obese in adults has nearly doubled during the past two decades, and obesity increases the risk of heart disease, diabetes, and even some types of cancer. One of the factors closely linked with the obesity epidemic is overconsumption of dietary fat. Accumulating evidence has supported the existence of the "taste of fat", and more and more studies have focused on identifying the mechanisms of fatty acid detection by gustatory system. In this study, I showed for the first time that medium-chain saturated fatty acids (MCFAs) were able to activate taste cells isolated from mice, and …

A Light In The Dark: Luminescence Dating Intermountain Ware Ceramics From Four Archaeological Sites In Northwestern Wyoming, Carlie J. Ideker

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The chronology of high-altitude archaeological sites in northwestern Wyoming is poorly understood due to limited reliable age constraints. While temporally diagnostic artifacts provide relative age control, fluctuations in atmospheric radiocarbon produce radiocarbon age results with multiple calibrated age-range intercepts that prove difficult to interpret. Age overestimates associated with the 'old wood' problem can be especially prominent at high-altitude sites where cold and semi-arid environments promote the presence of long-living trees and prolong the preservation of organic material. Moreover, regional droughts coupled with a pine beetle epidemic have resulted in increasing wildfire frequency and intensities that serve both as a benefit …

Synthesis, Structure-Activity Relationship Study, And Mode Of Action Study Of 1,4-Naphthoquinone Based Anticancer And Antimicrobial Agents, Jaya P. Shrestha

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The first three projects involve the synthesis and the mode of action study of 1,4-naphthoquinone based anticancer agents. These anticancer agents are highly potent against a wide range of cancer cell lines. These compounds showed ~8-fold selectivity towards the lung cancer cell line than the normal cell line. We also studied the mode of action and observed that generation of reactive oxygen species is the primary mode of action.

The final project involves the synthesis of multi-cationic antimicrobial agents. These compounds are active against both bacteria and fungi. These compounds are very easy to synthesize and can be scaled up …

Does Experience With Sagebrush In Utero And Early In Life Influence The Use Of Sagebrush By Sheep?, Ashley T. Longmore

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Learning from mother begins early in the developmental process and can have lifelong effects when it comes to forage preferences. Recent research suggests that mothers are a powerful and positive influence before birth. Pregnancy is not an incubation period buy a staging period for well-being and disease later in life. Better understanding the developmental processes which take place in utero and the effects they have later in life may help us create management plans that utilize grazing animals to their full potential as landscape manipulators.

Using in utero and early-life programming as a management tool is a relatively new concept, …

Anaerobic Digestion Process Stability And The Extension Of The Adm1 For Municipal Sludge Co-Digested With Bakery Waste, Morris Elya Demitry

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The anaerobic digestion process is used to treat and convert waste organic matter to biogas (principally methane and carbon dioxide) through biological, chemical and physical reactions. The biogas can be used as a source of energy recovery. In order to increase the biogas production rate, two different kinds of waste (municipal wastewater treatment sludge and bakery waste) were mixed together to enhance the anaerobic process and increase the biogas production in pilot scale reactors. The process succeeded in increasing biogas production and at the same time kept the process of treatment effective when high rates of organics were fed to …

A Counting-Focused Instructional Treatment For Developing Number System Knowledge In Second-Grade: A Mixed Methods Study On Children's Number Sense, Jessica F. Shumway

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Instruction for developing students' number sense is a critical area of research in mathematics education because of the role number sense plays in early mathematics learning. Specifically, number system knowledge has been identified as a key cognitive mechanism in number sense development. The purpose of this mixed methods study was to explore variations in second-grade students' number sense development as they engaged in a counting-focused instructional treatment, geared towards developing number system knowledge, for differing amounts of time. Sixty second-grade students participated in number sense assessments and two students participated in in-depth, task-based interviews to provide quantitative and qualitative data …

Microalgae Sorption Of Ten Individual Heavy Metals And Their Effects On Growth And Lipid Accumulation, Eric M. Torres

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this study is to determine the potential microalgae have for being a heavy metal remediation tool. Heavy metals are naturally occurring elements that can be found inside the earth or on its surface. Typically, heavy metals are found naturally at low concentrations. However, through human activities, heavy metals are continually making their way to the surface and being concentrated. This happens largely through mining and manufacturing operations. For example, NiCd batteries produce waste containing nickel and cadmium, and paper manufacturing produces waste containing high levels of lead. As underdeveloped nations continue to industrialize and the world population …

The Impact Of Social Comparisons On Stereotype Threat For Black College Students Attending Predominantly White Colleges And Universities, Odessia Knowles

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Despite increasing college enrollment rates for Black individuals, college completion rates remain dismal, thus the achievement gap between Black and White students remains in effect. One reason which may contribute to low completion rates for Black college students is stereotype threat. Stereotype threat is when an individual is at risk of confirming a negative stereotype about their group membership. For Blacks attending college, the threat would be related to academic underachievement. However, the impact of stereotype threat is highly individualized and an individual’s Black racial identity may impact stereotype threat for certain individuals.

Social comparison theory suggests that to gain …

An Analysis Of Variability Of Play Behavior With Preschool Children With Autism, Mary Katherine Endicott Harris

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Children with autism often display repetitive, stereotypical movements with toys in lieu of appropriate play skills. Unlike typically developing children, they do not vary their play with toys. Therefore, the purpose of this study was to determine whether three preschoolers with autism would vary their play actions when exposed to a lag schedule of reinforcement and physical prompting procedure. All three participants demonstrated varied play actions with the lag schedule and prompting procedure in place. These behaviors maintained when a probe was conducted two weeks later in the absence of the lag schedule. Although responding was high in the 2-week …

Effects Of Environmental Water Rights Purchases On Dissolved Oxygen, Stream Temperature, And Fish Habitat, Nathaniel R. Mouzon

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Degraded water quality has reduced aquatic species abundance and survivability in Nevada’s Walker River. Low instream flows and increased nutrients affect native fish populations through high daily stream temperatures and low nightly dissolved oxygen concentrations. Increasing streamflow, through environmental water purchases, may improve water quality and enhance habitat for native fish species, such as Lahontan cutthroat trout. This study uses River Modeling System, a computer model, to estimate streamflows, stream temperatures, and dissolved oxygen concentrations in the Walker River. Streamflow increases are simulated to determine potential improvements to high water temperatures and low dissolved oxygen concentrations, enabling the prioritization of …

Student Satisfaction At Utah State University Regional Campuses, Taylor K. Adams

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This research examined the difference between what undergraduate students at Utah State University (USU) regional campus locations perceive as important to their education and how satisfied students are with those education-related priorities. As institutions offer more distance education coursework, enrollment of nontraditional students is increasing. However, few studies examine satisfaction, which is a proven predictor of retention, of the student population described in this study.

The results of this study showed the highest discrepancies between priorities and satisfaction of undergraduate students at USU related to academic advising, course scheduling and registration; and finances including student fees, tuition, and financial aid …

Effects Of A Flavonoid-Rich Diet On Gut Microbiota Composition And Production Of Trimethylamine In Human Subjects, Justin S. Bell

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The prevalence of cardiovascular disease is a major public health concern worldwide. It has been theorized that diets rich in fruits and vegetables may be protective against the development of cardiovascular disease mainly through their high content of flavonoids. Flavonoids were thought to influence traditional risk factors of cardiovascular disease such as blood pressure, lipid profile, and systemic inflammation. Recent clinical studies have shown that this may not be the case. The production of trimethylamine oxide (TMAO) by the gut microbiota from dietary sources of choline has been associated with an increased risk of cardiovascular events. The objectives of this …

Increasing The Sustainability Of Utah Farms By Incorporating Quinoa As A Novel Crop And Protecting Soil Health, Kristine R. Buckland

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Most of the western United States faces increasing water shortages in the coming years, that will present a major challenge for maintaining sustainable farms. Incorporating an alternative crop that is well adapted to projected changes in climate could be a successful approach to increasing the sustainability of farms in the region. Quinoa, Chenopodium quinoa Willd., may be an ideal alternative crop to meet the demands of the Intermountain West. Before widespread adoption of this novel crop can occur, best management strategies need to be documented. This paper provides research on cropping systems, irrigation rates, and weed competition with quinoa. Additionally, …

Sagebrush Ecology Of Parker Mountain, Utah, Nathan E. Dulfon

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

On Parker Mountain located in south central Utah, management actions such as controlling mountain big sagebrush (Artemisia tridentata Nutt. subsp. vaseyana), with mechanical and chemical treatments can increase forage for livestock and benefit wildlife such as greater sage-grouse (Centrocercus urophasianus). Tebuthiuron treatments were applied on Parker Mountain from 2000-2012 with assistance from the Utah School and Institutional Trust Lands Administration, the Utah Department of Food and Agriculture, and the Natural Resources Conservation Service. Treatments applied to mountain big sagebrush on Parker Mountain provide an important opportunity to evaluate the value of mountain big sagebrush treatments in …

Peer-Implemented Script Fading To Promote Play-Based Statements In Children With Autism, Jessie Rosdahl

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Teaching communication and social skills to children with autism spectrum disorder (ASD) requires systematic teaching and instruction. Teachers provide these interventions to multiple students and the efforts can be strenuous. In order to help relieve teachers, as well as provide a more efficient way to teach social skills, this study was conducted to assess the benefits of using peers as implementers and communication exchange partners for children with ASD. In this study, we used an intervention called script fading, a prompt procedure that provides children with ASD with an appropriate audio phrase, which they then repeat during play. This study …

Stable Isotopes And The Ecology And Physiology Of Reptiles, Andrew M. Durso

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

When animals don’t have enough food, they have to “choose” between “spending” their limited energy on themselves or on their offspring. Biologists think that reptiles can make this choice quickly in response to different environments. But, it can be hard to study these choices because it is hard to convert between, for example, the number of eggs laid and the speed of healing a wound. By using stable isotope chemistry, we can collect more detailed and comparable information about how lizards and other animals spend their limited resources than with any other method. For example, lizards in the wild have …

Agricultural Nitrogen Management Affects Microbial Communities, Enzyme Activities, And Functional Genes For Nitrification And Nitrogen Mineralization, Yang Ouyang

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Improved understanding of nitrogen cycling in agriculture is essential for increasing fertilizer use efficiency and sustainable food production. The availability and mobility of nitrogen are largely determined by the processes of nitrogen mineralization and nitrification. Nitrification is mediated by ammonia oxidizing bacteria, ammonia oxidizing archaea, and nitrite oxidizing bacteria. Our understanding of the controls on the relative activity of these nitrifying organisms in soil is limited. A wide variety of soil microorganisms produce enzymes that mineralize nitrogen from organic matter, but we have limited knowledge about links between enzyme activity and the microbes that work in soil. The main objective …