Digital Commons Network^™

Staff Interactions And Affect In Persons With Dementia: An Observational Study Of A Memory Care Unit, Keirstin V. Meyer

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

It is estimated that the number of people in the United States living with dementia in 2015 will nearly triple by the year 2050. With no cure for dementia, we are faced with providing care in a way that maximizes well-being. The majority of prior research focused on the best ways to reduce behavioral problems and mood disorders, such as depression and anxiety. The objective of this study was to increase knowledge about the social influences on well-being in persons with dementia, particularly from staff in residential memory care units. This study found that the most common interaction type from …

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 …

Effects Of Thermosonication On Microbial Population Reduction And Solubility Index In Skim Milk Powder, Nicola F. Beatty

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Thermosonication has been researched as a means to improve shelf life, quality, and functional properties in dairy products. This study explored the effects of thermosonication on the inactivation of Geobacillus stearothermophilus in concentrated skim milk as a function of total solids content, temperature, and time and investigated changes in the solubility of the skim milk. Results showed thermosonication had an increased bactericidal effect on both vegetative cells and spores as compared to heat treatment alone without affecting solubility. A model was developed using response surface analysis showing that log reductions produced by thermosonication can be predicted based on a polynomial …

The Demography And Determinants Of Population Growth In Utah Moose (Alces Alces Shirasi), Joel S. Ruprecht

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Moose (Alces alces) occur widely in northern regions of the world. Across their distribution, the species is considered to be of high intrinsic, ecological and recreational value. Populations of moose along their southern range limit in North America have shown erratic population dynamics in recent decades including severe numeric declines in some areas. Moose in Utah belong to the Shiras subspecies, which is a relatively understudied population segment. Additionally, moose in Utah represent the southernmost naturally occurring moose populations worldwide. Concerns over possible declines and a paucity of baseline data on moose within the state prompted the Utah …

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 …

Effect Of Chronic Administration Of Oxytocin On Corpus Luteum Function In Cycling Mares, Katherine Clissold Parkinson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Undesirable and variable behavior in mares related to the reproductive cycle is a common issue reported in the equine industry, especially for female horses in a performance setting. These behaviors can interfere with and decrease, overall performance. The objective of this study was to determine if administration of 60 units of the hormone oxytocin once daily for 29 days, regardless of when treatment was initiated during the estrous cycle, would induce prolonged corpus luteum function in cycling mares. Mares were randomly assigned to two groups: 1) saline-treated control (n=7) and 2) oxytocin-treated (n=9). Control mares received 3 cc saline and …

A Spatiotemporal Mountain Pine Beetle Outbreak Model Predicting Severity, Cycle Period, And Invasion Speed, Jacob P. Duncan

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The mountain pine beetle (MPB, Dendroctonus ponderosae), a tree-killing bark beetle, has historically been part of the normal disturbance regime in lodgepole pine (Pinus contorta) forests. In recent years, warm winters and summers have allowed MPB populations to achieve synchronous emergence and successful attacks, resulting in widespread population outbreaks and resultant tree mortality across western North America. We develop an age-structured forest demographic model that incorporates temperature-dependent MPB infestations: the Susceptible-Infested-Juvenile (SIJ) model. Stability of equilibria is analyzed as a function of population growth rates, and indicates the existence of periodic outbreaks that intensify as growth rates …

Aligning Conservation Goals And Management Objectives For Bonneville Cutthroat Trout (Oncorhynchus Clarki Utah) In The Logan River, Utah, Harrison E. Mohn

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Rivers are often managed without informed knowledge of how sportfish use different areas of the river to reproduce, and rarely take into account the relationship between fish movement and how they are distributed within the river when making management decisions. The population of native Bonneville cutthroat trout (Oncorhynchus clarki utah) within the Logan River is the largest documented population remaining for this imperiled species, and still maintains extremely high numbers of fish in the upper river. Currently, fishing is not allowed in the upper 20 kilometers of the Logan River watershed during spawning, based on the assumption that …

Effects Of Carboxymethyl-Lysine In Heat Processed Foods On The Plasma Metabolome In Mice, Zhou Fang

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Carboxymethyl-lysine (CML), an advanced glycation end product (AGEs), is formed during the cooking process and may induce toxic effects on human health. The effect of dietary CML on the plasma metabolite profile was investigated. Mice were fed with one of five different diets: AIN93 diet (negative control), a 45% kcal from fat Diet Induced Obesity diet (DIO; positive control); CML0, TWD (Total Western Diet) with low CML; CML1, TWD with medium CML, and CML2, TWD with high CML for 8 weeks, and the plasma metabolome was determined by Gas Chromatography-Mass Spectrometry (GC-MS). In addition quantitative analysis of plasma glucose level …

Atp Usage In The Dark-Operative Protochlorophyllide Oxidoreductase, Mark S. Soffe

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Chlorophylls are essential pigment molecules that function in photosynthesis, and serve to aid in utilizing energy from sunlight to power cellular processes in plants, and other organisms. To make chlorophyll, photosynthetic organisms devote an abundance of resources and energy to ensure their appropriate construction. This process of making chlorophylls is highlighted by the penultimate step in the pathway—the conversion of protochlorophyllide (Pchlide) to chlorophyllide a (Chlide).

This conversion can be mediated in two different ways, depending on the type of organism. The first method incorporates the use of a light-activated system called the light-dependent protochlorophyllide oxidoreductase (LPOR). This system, as …

The Bat And The Spider: A Folkloristic Analysis Of Comic Book Narratives, Wesley Colin Van De Water

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This thesis examines the folkloric evolution of superhero narratives over the past century. Utilizing theories from folklorists such as Lord Raglan, Vladimir Propp, Joseph Campbell, Barre Toelken, and Alan Dundes, it examines the core qualities prized by folklorists, and how these same elements can be found in superhero narratives, despite their mass produced nature and place amidst American popular culture. It examines classic hero tale structures, as well as the folkloric theories of dynamism and conservatism. The main argument is that these narratives are folkloric in nature, and that the discipline of folklore would benefit from their study.

Teacher Attitudes And Perceptions Of Low And High Socioeconomic Status Students, Patty C. Norman

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In this qualitative study, the author explored the perceptions of 10 middle-class, teachers regarding the socioeconomic class of both impoverished and advantaged students with whom they worked. Teachers in two public elementary schools from one Intermountain West school district participated; one school generally served children living in poverty and the other generally served affluent children. Through analysis of surveys, interviews, teacher journals, and researcher journal, the complex and often times contradictory feelings these teachers had about the socioeconomic class of students were revealed.

Literature in class, socioeconomic class, deficit thinking, race and whiteness, and identity and multiple identities situated the …

The Relationship Between Adolescents' Use Of Internet-Enabled Mobile Devices And Engaging In Problematic Digital Behaviors, Ryan Atwood

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this study was to examine the relationship between teenagers’ use of mobile Internet devices and their involvement in risky digital behaviors, including problematic Internet use, exposure to pornography, and participation in sexting. A sample of teens between the ages of 13-18 was used for this study.

It was found that teens who used smartphones as their primary source of Internet access were most likely to receive sexting requests, while teens using computers to access the Internet were most likely to intentionally view pornography. Additionally, teens who used multiple mobile devices to connect to the Internet and teens …

Biodiversity, Community Dynamics, And Novel Foraging Behaviors Of A Rich Native Bee Fauna Across Habitats At Pinnacles National Park, California, Joan M. Meiners

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Global concern about honeybee declines has spurred feverish research about the status and protection of this single species, yet our understanding of the ecology and issues impacting thousands of species of native bees lags behind. Pinnacles National Park, America's newest, near Salinas, California, is currently the most densely biodiverse area for native bees known on the planet. Recent work by researchers at Utah State University and the USDA-ARS has documented 479 species of native bees in only 42 square miles of this park. During two years of field studies and 308 collector days, we assembled data on 52,853 bee specimens …

Production Of Synthetic Spider Silk Fibers, Cameron G. Copeland

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Dragline spider silk is among the strongest known biomaterials. It is the silk used for the framework of the web and it is used to catch the spider if it falls. As such, it is stronger and much more flexible than KEVLAR©. Studies show that dragline silk is made of two proteins, Major Ampullate Spider Proteins 1 and 2 (MaSp1 and MaSp2). Due to its incredible mechanical properties, spider silk is being considered for use as a new biomaterial for drug delivery and tendon and ligament replacement/repair, as well as athletic gear, military applications, airbags, and tire cords. However, spiders …

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 …

Anthropogenic And Natural Stressors And Their Effect On Immunity, Reproduction, And The Stress Response, Lorin A. Neuman-Lee

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Animals must be able to cope with many natural and human-made stressors in order to successfully survive and reproduce. These stressors can come in many forms and are increasing as human activities become more and more prevalent across the globe. In order to cope with these stressors, organisms must allocate limited energy away from processes such as reproduction to mount a stress response. This stress response involves the activation of the hypothalamic-pituitary-adrenal axis and results in a cascade of hormones and down-stream effects, such as changes in reproduction and immune function. In order to understand how reptiles and amphibians cope …

Impulsive Choice, Alcohol Self-Administration, And Pre-Exposure To Reward Delay, Jeffrey S. Stein

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Prior research indicates that drug dependence is associated with a tendency to discount the future. For instance, compared to control participants, drug-dependent participants more strongly prefer small, immediate rewards (e.g., $10 now) over larger, delayed rewards (e.g., $100 in 6 months). Similarly, in animal models of addiction, impulsive preference for small, immediate over larger, delayed food rewards in rats is associated with greater consumption of a number of drugs of abuse, including alcohol, cocaine, and nicotine. These and other findings suggest that this form of impulsive choice plays a causal role in addiction; however, this account has not been tested …

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 …

Structural Insights Into The Regulation Of Electron Transfer In Nitrogenase, And Modulating The Reactivity Of The Isolated Iron Molybdenum Cofactor, Andrew J. Rasmussen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

One of the most important scientific advances in the last century was the Haber-Bosch process, the industrial process of fixing nitrogen from the atmosphere to ammonia. This allowed for the commercial production and sale of nitrogen for important uses such as fertilizer for farming. The Haber-Bosch process is partially credited with the population boom that has been seen in the last century and has greatly increased the standard of living in the developed world today. While this was a great scientific breakthrough, the cost of producing the required ammonia is high, and roughly 2% of worldwide energy is used annually …

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 …

An Examination Of How Qualitatively Different Delayed Outcomes Are Discounted, Jonathan E. Friedel

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Jonathan E. Friedel, a graduate student in the Experimental and Applied Psychological Sciences program at Utah State University, will complete this dissertation as part of the requirements of the degree of Doctor of Philosophy in Psychology.

Outcomes that are received far in the future are less valuable than outcomes that are to be received more proximally. Delay discounting describes how outcomes in the future lose value. The goal of this dissertation is to examine how people discount different types of delayed outcomes. Two experiments examine the value of a wide
variety of delayed outcomes for cigarette smokers and nonsmokers. These …

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 …

Effects Of Feeding High-Moisture Corn Grain With Slow-Release Urea In Dairy Diets On Lactational Performance, Energy And Nitrogen Utilization, And Ruminal Fermentation Profiles By Lactating Cows, Braden M. Tye

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The objective of this experiment was to determine if nutrient utilization and energy partitioning by lactating dairy cows would differ in response to dietary corn grain (CG) types [steam-flaked corn (SFC) vs. high-moisture corn (HMC)] and to test if the types of CG would interact with slow-release urea (SRU) on lactational performance and energy utilization. Eight multiparous Holstein cows (32 ± 8.2 days-in-milk) were used in a duplicated 4 × 4 Latin square with one square consisting of ruminally cannulated cows. A 2 × 2 factorial arrangement was used to test 4 dietary treatments: SFC without SRU, SFC with SRU, …

"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 …