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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 …

Computational Chemistry Of Non-Covalent Interaction And Its Application In Chemical Catalysis, Vincent De Paul Nzuwah Nziko

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Known to be weaker than conventional covalent bonds, non-covalent bonds, especially hydrogen bond, has shown to be of great importance in molecular structures such as DNA, RNA, proteins and other organic frameworks. In this dissertation, we looked at non-covalent interactions other than the hydrogen bond. Replacement of the bridging hydrogen atom in a typical hydrogen bond by other atoms such a halogen, chalcogen and tetrel lead to the formation of interactions which are comparable in strength to the hydrogen bond. Unlike the hydrogen bond which arises mainly from electrostatics, these unconventional interactions mostly result from induction. Besides studying the fundamentals …

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 …

Exploiting Self-Organization In Bioengineered Systems: A Computational Approach, Delin Davis

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Bio-reactors, also known as microbial factories are used extensively to produce various industrially valuable products. However, scalability and stability of these factories are limited as it is difficult to deliver nutrients and extract product and waste from a large system. Current solution approaches explore changes in the physical configuration of the bio-reactors. Inspired from the nutrient delivery mechanisms of large organisms in nature, this work studies the possibilities of exploiting self-organizing bio-engineered cells which are capable of organizing into a vessel network to support the producer cells in the factory.

Primary goal of this dissertation is to design a proof-of-concept …

"Reasonably Bright Girls": Theorizing Women's Agency In Technological Systems Of Power, Emily January Petersen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A woman’s experience in the workplace is an inductive process into a technological, hierarchical, and often male-dominated system. This study examines how female practitioners in technical and professional communication confront the technological system of the workplace. I trace the forces that contribute to the hierarchy and power struggles women face, I present how they claim authority and agency within such hierarchical and technological systems, and I show how these experiences can lead to activism and advocacy. In addition, my findings suggest that some women leave the workplace altogether in favor of less structured and more innovative ways of communicating about …

The Effect Of Weight On The Perceptions Of And Attitudes Toward Individuals With Anorexia Nervosa, Allison E. White

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A large body of research has shown that stigmatizing attitudes toward individuals with mental illness are widespread and prevalent. Fewer studies have focused on stigma toward eating disorders, in general, and even less have focused on the stigma of anorexia nervosa (AN), specifically. Preliminary research indicates that AN may be both stigmatizing and admired, but the factors contributing to the perception of AN has not been adequately studied. To date, researchers have yet to examine the role of body size in the perception of and attitudes toward individuals with AN. By showing participants one of three female figures varying only …

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 …

The Association Between Shared Values And Well-Being Among Married Couples, Travis G. Parry

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The primary objective of this research study was to examine the shared values and marital well-being of married couples and to see if there was a relationship between these variables. A secondary purpose of this study was to examine the marital well-being variables (financial stability, marital happiness, individual well-being) and see if there were relationships between these variables when analyzed simultaneously.

This study found a positive relationship between several shared values and the marital happiness and individual well-being variables of material well-being. However, no shared values were related to financial stability. The study did find positive relationships between all martial …

Migratory Waterbird Ecology At A Critical Staging Area, Great Salt Lake, Utah, Maureen G. Frank

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Millions of birds use Great Salt Lake, Utah, during their migrations every year. While many of the birds use the shorelines and wetlands around Great Salt Lake, there are three migratory species that use the open waters of Great Salt Lake: Wilson's phalaropes (Phalaropus tricolor), red-necked phalaropes (Phalaropus lobatus), and eared grebes (Podiceps nigricollis). Eared grebes feed primarily on brine shrimp (Artemia fanciscana), while phalaropes are thought to consume brine flies (Ephydridae) and brackish-water aquatic invertebrates. Despite the reliance of phalaropes and eared grebes on the invertebrate prey of Great Salt Lake, …

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 …

Investigating Biosynthetic Steps Of An Angucycline Antifungal, S. Gabrielle Gladstone

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The species of bacterium Streptomyces sp. SCC-2136 which has the American Type Culture Collection index 55186 naturally produces two chemical compounds, labeled Sch 47554 and Sch 47555. These compounds were previously reported to posess antifungal activity. This thesis sets out to confirm the mechanism by which the bacterium produces these compounds; specifically which genes are responsible for producing the enzymes that make and shape the molecules.

The genes and enzymes that were characterized are the minimal polyketide synthase, the ketoreductase that specifically acts on the ninth carbon, the first-ring aromatase, the subsequent ring cyclase, and two oxygenases. Also elucidated …

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 …

Rapid Savanna Response To Changing Precipitation Intensity, Ryan S. Berry

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Climate change has the potential to cause large-scale changes in plant growth, biodiversity, and biosphere-climate feedbacks. A pervasive aspect of climate change is that as the atmosphere warms, precipitation events are likely to become less frequent but more intense, because warmer air can hold more water. Larger precipitation events can be expected to change plant productivity and community composition, particularly in semiarid ecosystems such as savannas. Savannas are of particular interest because they are spatially expansive at the global scale, they are important to humans for food production, and they are known to be sensitive to changes in soil water …

Control Of Large Stands Of Phragmites Australis In Great Salt Lake, Utah Wetlands, Chad R. Cranney

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Phragmites (common reed) is a non-native, invasive perennial grass from Eurasia that is taking over wetlands across North America. In Utah, Phragmites has expanded to cover tens of thousands of acres in and around the Great Salt Lake (GSL). The GSL and its associated wetlands are recognized regionally and hemispherically as an important bird area (IBA) that provide critical habitat for a wide variety of wetland dependent birds. The invasion and expansion of Phragmites has replaced many of the high quality habitats these avian populations rely on. This research aimed to determine the most effective methods to control Phragmites and …

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 …

The Role Of Sexual Communication In Committed Relationships, Adam C. Jones

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In this Master's thesis, I describe a study to understand the role that sexual communication plays within committed couple relationships. I used data from a sample of 142 couples who completed an online survey consisting of a battery of quantitative assessments measuring relationship satisfaction, sexual satisfaction, communication processes, and sexual communication.

Through path analysis, a statistical tool that tests relationships between variables, I observed the impact that sexual communication has within couple relationships. In my findings, I highlight the differences between the "what" and "how" behind couples' communications about sex. I examined these findings by gender and found important differences …

Socialization Of Respeto In Immigrant Mexican Families, Marsha Tafoya

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Respeto is a cultural value considered to be essential in Latina/o families. Latina/o parents endorse respeto as being an important to teaching to their children. Mental health professionals argue that it is important to understand cultural values in delivering appropriate and relevant services to ethnic and culturally diverse clients. Some experts argue that such focus on cultural context also improves the effectiveness of interventions. The current study examined the cultural value of respeto in immigrant Mexican parents with a child between 4 and 9 years of age. Two scales were developed to examine the behavioral displays of respeto in boys …

Assessing Plant Community Structure In The Upper Las Vegas Wash Conservation Transfer Area, Nevada: The Influence Of Biotic And Abiotic Variables, Amy A. Croft

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Ecological communities are complex, the structure of which is composed of interactions between multiple community characteristics and the abiotic and biotic factors shaping them. Because of this complexity, ecological studies are generally limited in scope and size, often dissecting communities into their component parts to examine them piece by piece. While this might be the most practical method to study communities, this approach often neglects other characteristics that, with their inclusion, would provide a more complete picture of community ecology. The studies described in this dissertation were conducted in an effort to synthesize the complexity that is inherent in ecological …

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 …

Relationships Between Riparian Vegetation, Hydrology, Climate And Disturbance Across The Western United States, Nathaniel Hough-Snee

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Flow regime, the magnitude, duration and timing of streamflow, controls the development of floodplain landforms on which riparian vegetation communities assemble. Streamflow scours and deposits sediment, structures floodplain soil moisture dynamics, and transports propagules. Flow regime interacts with environmental gradients like climate, land-use, and biomass-removing disturbance to shape riparian plant distributions across landscapes. These gradients select for groups of riparian plant species with traits that allow them to establish, grow, and reproduce on floodplains – riparian vegetation guilds. Here I ask, what governs the distributions of groups of similar riparian plant species across landscapes? To answer this question, I identify …

Spider Aggregate Glue Sequence Characterization And Expression, Kyle Berg

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Orb-weaving spiders create a glue which is secreted onto the web to capture and retain insects. This glue is made from aggregate protein. Aggregate glue is sticky when wet and can stretch far when pulled at slow speeds, and pull back with a greater force if pulled at high speeds which helps it achieve its purpose as the adhesive that keeps insects in the web. These features also make it an attractive target for applications such as a surgical glue or underwater adhesive. Unfortunately, very little is known about the aggregate glue gene, and knowledge of the genetic sequence is …

To Dot Product Graphs And Beyond, Sean Bailey

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

We will introduce three new vector representations of graphs. These representations are based on relationships between the vectors that are used. Specifically, we will examine scenarios where we ignore specific relationships, where we consider if information is missing, and where we look for when the information in common is not of a specified amount.

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 …

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 …

Revegetation Of Bulrushes Bolboschoenus Maritimus, Schoenoplectus Acutus, And S. Americanus In Great Salt Lake Wetlands: Seed Biology And Influence Of Environmental Factors On Rhizomes, James Marty

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A primary goal of ecological restoration is to establish desirable plant species. This goal is particularly important following the removal of invasive plants. Understanding biological characteristics of plant species important to revegetation is crucial to plant establishment. In the globally important Great Salt Lake (GSL) wetlands, native habitat-forming bulrushes Bolboschoenus maritimus, Schoenoplectus acutus, and S. americanus are frequently displaced by the invasive grass Phragmites australis. Bulrush seeds require very specific germination conditions and are also dormant, therefore they do not germinate consistently even when exposed to appropriate germination conditions. Additionally, wetland environments are often associated with water …

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 …

Salt Tolerance Of Forage Kochia, Gardner's Saltbush, And Halogeton: Studies In Hydroponic Culture, Joseph Sagers

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Halogeton (Halogeton glomeratus) is a halophytic, invasive species that displaces Gardner’s saltbush (Atriplex gardneri) on saline rangelands. Forage kochia (Bassia prostrata) is a potential species to rehabilitate these ecosystems. This study compared the salinity tolerance of these species and tall wheatgrass (Thinopyrum ponticum) and alfalfa (Medicago sativa). Plants were evaluated for 28 days in hydroponics where they were maintained at 0, 150, 200, 300, 400, 600, and 800 mM NaCl. Shoot growth and ion accumulation were determined. Alfalfa and tall wheatgrass were severely affected by salt with both species’ shoot …

Synthetic Spider Silk Sustainability Verification By Techno-Economic And Life Cycle Analysis, Alan Edlund

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Major ampullate spider silk represents a promising biomaterial with diverse commercial potential ranging from textiles to medical devices due to the excellent physical and thermal properties from the protein structure. Recent advancements in synthetic biology have facilitated the development of recombinant spider silk proteins from Escherichia coli (E. coli), alfalfa, and goats. This study specifically investigates the economic feasibility and environmental impact of synthetic spider silk manufacturing. Pilot scale data was used to validate an engineering process model that includes all of the required sub-processing steps for synthetic fiber manufacture: production, harvesting, purification, drying, and spinning. Modeling was constructed modularly …