Digital Commons Network^™

Interference Between Speaking And Computer Tasks In Younger And Older Adults, Paige Elise Asay

Theses and Dissertations

This study examined the effects of computer tasks on speech acoustic measures and the effects of speaking on computer task performance in 30 younger and 30 older adults. Participants completed a speech only task, two computer tasks, and simultaneous speaking and computer tasks. Stimulus sentences included the four corner vowels and two diphthongs embedded between voiceless consonants. Acoustic measures of speech included diphthong transition extent and rate as well as vowel space area (VSA) and vowel articulation index (VAI). A text formatting task included two levels of difficulty. A data entry task included sorting items from a shopping list into …

Taxonomic Revision And Phylogenetic Analysis Of The Philadelphicus Group In The Genus Proctacanthus (Insecta: Diptera: Asilidae), And Key To All Proctacanthus North Of Mexico, Teagan Marie Mulford

Theses and Dissertations

Proctacanthus (Macquart 1838), an elegant genus of robber flies within the Asilidae family, plays a significant ecological and economic role. However, the lack of a comprehensive taxonomic treatment hinders their identification and thus their use in evolutionary and behavioral research. This study focuses on the taxonomic revision of the Proctacanthus, identifying the features used in recognizing the philadelphicus Species Group and the rufiventris Species Group. By providing systematic and biological data, describing new species, and offering a key for identification, this research contributes to understanding the ecological significance and geographic distribution and history of Proctacanthus. This work will enhance future …

Feasibility Of Rna-Based Pathogen Detection In An Infant Formula Matrix, Gweneth Claire Gustafson

Theses and Dissertations

Background: The dairy processing industry is currently hindered by slow, antiquated testing for high-risk pathogens, including Listeria monocytogenes and Cronobacter sakazakii. Powder infant formula's low water activity and substantial fat content enhance the survival and thermotolerance of such foodborne pathogens. As DNA-based detection methods can produce false positives even after cell death, a more accurate approach is needed. The objective of this study is to evaluate the suitability of an RNA-based platform for the detection of pathogens in a dairy powder matrix. Materials and Methods: A unique phenol-chloroform extraction method was used to obtain total RNA from heat-killed and unheated …

Critical Engagements With Award Winning Picturebooks: My Journey In Creating A More Equitable Classroom Library, Carrie Elizabeth Crowe

Theses and Dissertations

Research consistently shows that students from historically marginalized populations have difficulty accessing texts that represent the realities of their lives. Concerned that such might be the case for my students, I conducted an inventory of my classroom library and sought out award-winning texts that could make my library more diverse and inclusive. I then analyzed these award-winning texts using Bishop's (1992) categories of multicultural literature in order to better understand the picturebooks' underlying messages and ideologies. My examinations showed that the majority of the texts fit into the same category (culturally specific), though I was able to identify award-winning texts …

Terahertz From Electrons, Electronics From Terahertz, Clayton D. Moss

Theses and Dissertations

Time-domain terahertz spectroscopy (THz-TDS) is a valuable technique for studying collective ultrafast phenomena. Several mechanisms exist for converting ultrashort optical laser pulses into coherent THz sources. Broadband THz pulses can be obtained from electron currents in air plasma, which requires combinations of different colors of light to be most effective. I report multi-color generation schemes of THz pulses that deliver coherent THz output. Experimental and theoretical work using the photocurrent model describe ways to use non-harmonic color combinations to utilize several sources of light available in a table-top laser setup. Additionally, THz-TDS is used to study a variety of ultrafast …

Nanoformulations Of Essential Oils Extracted From Pistacia Lentiscus And Boswellia Sacra And Investigation Of Their Anticancer, Antimicrobial, And Antioxidant Activities., Obaydah Abd Alkader Alabrahim

Theses and Dissertations

Essential oils (EOs) obtained from natural sources have shown promising biological and therapeutical properties such as anticancer, antimicrobial, and antioxidant activities, attributing to their high content of a variety of bioactive components. However, EOs’ therapeutic properties are limited by their low stability, poor bioavailability, high volatility, and low targeting ability. Therefore, the encapsulation and nanoformulation of EOs can maximize their therapeutical efficiency and physicochemical properties while overcoming their undesirable side effects and drawbacks. EOs extracted from the resins of Pistacia Lentiscus var. Chia (P.oil) and Boswellia Sacra (B.oil) are two promising EOs that have shown great therapeutic potential. P.oil was …

Exploring The Role Of Salt-Tolerant Halomonas Inoculant In Altering Plant Gene Expression To Improve Salt Tolerance In Alfalfa., Ashley Kay Miller

Theses and Dissertations

Soil salinity is an increasing problem facing agriculture in many parts of the world. Climate change and irrigation practices have led to decreased yields of large areas of farmland due to increased salt levels in the soil. Irrigation introduces salts to the soil that with time accumulate and threaten crop yield. In arid climates like Utah, the practice of irrigation is especially threatening to salt-sensitive crops including alfalfa (Medicago sativa). Plants that have tolerance to salt are needed to feed livestock and the world's population. One approach to address this problem is to introduce genes encoding salt tolerance into the …

Mahu And Native Hawaiian Culture: Experiences Of Non-Heteronormativity, Rachel Beth Chapman

Theses and Dissertations

There are extensive amounts of psychological research that highlight the needs and experiences of racial ethnic minority populations in general and more specifically minority sexual identities and genders, also referred to as non-heteronormative populations (Alexeyeff & Besnier, 2014). However, there continues to be a lack of representation in the research of Polynesians and an even greater lack of representation of non-heteronormative Polynesians and their experiences (Allen et al., 2011). Māhū, a population of native Hawaiians who identify as non-heteronormative or third gender, are almost completely absent from scholarly work. This study examines the experience of self-identified māhū and how mental …

Using De Novo Transcriptomes To Decipher The Relationships In Cutthroat Trout Subspecies (Oncorhynchus Clarkii), Andrea Leena Kokkonen

Theses and Dissertations

Cutthroat trout (Oncorhynchus clarkii) is a salmonid native to Western North America. For almost 200 years, the taxonomy of these species has fluctuated as ichthyologists and fisheries managers alike have tried to understand the diversity seen within these fishes. In the 1950s, Robert Behnke reexamined the cutthroat trout and identified 14 subspecies based on morphological observations, Pleistocene events, and modern geographic ranges. These designations were instrumental in preserving the remaining diversity of cutthroat trout. Over time, molecular techniques (i.e. karyotypes, allozymes, and mtDNA) have largely replicated Behnke's phylogenies. However, these studies have revealed that some of these relationships are consistently …

Evapotranspiration In Urban And Agricultural Systems With Interacting Irrigation And Nitrogen Fertilizer Treatments, Samantha R. Shumate

Theses and Dissertations

Nitrogen (N) fertilizer and irrigation are important inputs for all managed plant species, especially in arid and semi-arid climates. The interaction between N management and irrigation can lead to more sustainable practices. This is true for both agricultural and urban environments. Precision nutrient management has been widely adopted by producers in recent decades, and water conservation has become an important goal for turfgrass managers. In urban systems, our goal was to evaluate Kentucky bluegrass (Poa pratensis L.) to determine response to three N fertilizer rates and three irrigation rates in all possible combinations. The main and interacting treatment effects were …

Improving Xrd Analysis With Machine Learning, Rachel E. Drapeau

Theses and Dissertations

X-ray diffraction analysis (XRD) is an inexpensive method to quantify the relative proportions of mineral phases in a rock or soil sample. However, the analytical software available for XRD requires extensive user input to choose phases to include in the analysis. Consequently, analysis accuracy depends greatly on the experience of the analyst, especially as the number of phases in a sample increases (Raven & Self, 2017; Omotoso, 2006). The purpose of this project is to test whether incorporating machine learning methods into XRD software can improve the accuracy of analyses by assisting in the phase-picking process. In order to provide …

Understanding Gender Identification Within Individuals With Autism Using The Bem Sex-Role Inventory, Zackery Alan Cusworth

Theses and Dissertations

Gender is a socially derived construct that is taught and understood at young ages. However, not every individual has the same social skills to understand these seen and unseen social cues about gender. The Bem Sex-Role Inventory was given to adult individuals with autism in the United States to better understand their masculine, feminine, and androgenous perceptions. These data were then compared to the original Bem Sex-Role Inventory general population study to see if there were any differences. The data show that males with autism had lower masculine scores and higher feminine scores than males in the general population. Females …

An Assessment Of Cattle Traffic On, And Seed Dispersion Patterns Of, Sclerocactus Wrightiae, David D. Lariviere

Theses and Dissertations

Cattle grazing has been a historic use of rangelands in Utah since Pioneer settlement in the mid 1800's. Wright fishhook cactus is a small globose cactus endemic to an area of 280,000 ha in south-central Utah and was listed as endangered in October of 1979, by the U.S. Fish and Wildlife Service (USFWS). By 2010, concerns were expressed that soil compaction in proximity to the cactus posed a threat to this species, though there was no empirical data to support such concern. In order to assess the impact of cattle traffic on Wright fishhook cactus, we used an imprint device …

Characterization Of Phage-Host Interactions And Its Impact On Tail Fiber Evolution, Jessica Marie Lewis

Theses and Dissertations

Beyond the scope of what our unaided eyes can see is a diverse and rich microbial community that greatly impacts each of our lives. Bacteria are microscopic organisms that can grow, develop, divide, and even rapidly evolve to adapt to new changes in their environment. Because of this, bacteria have gained the ability to thrive in extreme biological niches ranging from the high temperature and pressure surrounding hydrothermal vents to the harsh acidic conditions of our stomachs. One adaptation attracting attention, however, is their capability to survive in the presence of common and even last-resort antibiotics. The WHO recently reported …

Predicting The Best Birds And Bees: Parental-Efficacy As A Mediator Between Parental Factors And Parent-Child Sex Communication, Meg O. Jankovich

Theses and Dissertations

Recent literature on parent-child sex communication (PCSC) has identified optimal sex communication as being not only frequent, but also open in quality, and proactive in timing. However, no studies have sought to understand what motivates parents to participate in this type of optimal parent-child sex communication, nor assessed these relationships longitudinally. Using Self-Determination Theory (SDT) to inform the analysis, this study investigated parent characteristics (parent's sexual self-concept and parenting dimensions) that may longitudinally predict optimal PCSC. This study further examined whether parental sex communication efficacy mediated these relationships. The sample included 607 mother-child dyads, and the father-figure when available (mother-father-child …

Loading Force In Recreational Runners And Its Effect On Achilles Tendon Biomechanical Properties, Joshua K. Sponbeck

Theses and Dissertations

Background: Achilles tendinopathy is a common debilitating running related injury. Achilles tendon loading force has been hypothesized as a contributor to Achilles tendinopathy. Loading force through the Achilles tendon during running is impacted by many factors such as footwear and foot strike pattern. Achilles tendon biomechanical (Achilles tendon cross-sectional area, thickness, echogenicity, stiffness, and T2*) responses to loading forces are variable and measurable in vivo. These responses impact the physiologic function of the tendon. Aims: 1) To evaluate baseline Achilles tendon biomechanical characteristics associated with a runner's habitual foot strike pattern. 2) To evaluate single running bout Achilles tendon biomechanical …

A Refuge And A Bridge: Native American Women's Tribal College Experiences, Morgan Duffy

Theses and Dissertations

This study, which focuses on the experiences of Native women attending a tribal college of the Northern Cheyenne Nation, responds to the call by Baird-Olson and Ward (2000) and Almeida (1997) for research that allows Native women, or the "hidden half," to tell their stories. Scant research has examined the value of tribal schools for Native American women and the experiences they have had in relation to their reservation and college lives. Providing narratives of women's experiences can illuminate how higher education in tribal college settings holds multiple values for Native women students as it acts as a refuge and …

Barriers And Facilitating Factors Of Sleep Assessment/Screening Among School Psychology Practitioners, Tyler Jjay Landon Storey

Theses and Dissertations

Sleep is an important and necessary part of life. While the biological need for sleep among school-aged individuals has not changed over the years, the quality and quantity of their sleep has. School-aged children reporting sleep deficits in the United States is on the rise and a significant body of research establishes associations between a lack of sleep and lower cognition as well as psychological and behavioral problems. These associations can heavily influence the academic progress and success of students. School psychologists are in a unique position to identify and provide support to individuals with sleep issues. Unfortunately, there is …

The Generalizability Of Proposed Theoretical Factor Models For Common Assessments For Specific Learning Disability In Reading Using A Community Sample, Sean B. Vanhille

Theses and Dissertations

Specific learning disabilities (SLD) are among the most diagnosed developmental disorders in children, with specific learning disability in reading (SLDR) as the most common. SLDR typically occurs due to deficits in phonological processing that can negatively impact decoding and/or reading comprehension skills. Reading deficits are often diagnosed using formal assessments such as the Comprehensive Test of Phonological Processing (CTOPP-2), the Gray Oral Reading Test (GORT-5), the Wechsler Intelligence Scale for Children (WISC-V), and the Woodcock Johnson Achievement Battery (WJ-IV-A). I did not find any research in which the theoretical factor models proposed in the technical manuals of these assessments were …

A Step Into Structural Biology: Structural Determination Of Tnk1-Uba And Computational Design Of A Radical Sam Cyclase, Yi-Jie Tseng

Theses and Dissertations

Structural biology uncovers life's secrets by studying protein structures via techniques like X-ray crystallography. This knowledge drives advancements in protein engineering for the improvement of human lives. Yet, obtaining high-quality crystals in X-ray crystallography is challenging. To overcome this, we used Translocation ETS Leukemia protein Sterile Alpha Motif domain (TELSAM), a promising polymer-forming crystallization chaperone (PFCC), to enhance protein crystallization. Human thirty-eight-negative kinase-1 (TNK1), a key player in cancer progression, possess a ubiquitin association (UBA) domain that binds polyubiquitin and regulates TNK1 activity and stability. Although sequence analysis hints at an unconventional TNK1 UBA domain architecture, its molecular structure lacks …

Tailoring Digital Physical Activity Support Messages For Women In Midlife With Elevated Risk For Cardiovascular Disease: A Multicomponent Study, Kiri Baga

Theses and Dissertations

Women in midlife (ages 40-60) are at heightened risk for cardiovascular disease (CVD). Although physical activity (PA) engagement can reduce CVD risk, few women engage in sufficient PA to receive this benefit. They cite lack of social support as a key barrier, but existing interventions that employ social support show limited effectiveness. Digital PA support messages (i.e., brief, text-based messages delivered via smartphone or other device) may be a powerful method to meet social support needs in daily life. However, women’s preferences for and responses to distinct types of messages are not well understood. The aim of this study was …

Ecofeminism Reimagined: Discourse & Embodiment In Young Adult Literature, Laurel Krapivkin

Theses and Dissertations

In this project, I will begin to develop a reimagined ecofeminist lens that is informed by a careful attention to the relationship between discourse and embodiment. The field of children’s literature would benefit from additional guidance on how to think complexly about ecofeminist tenants in young adult literature. While the novels I’ve chosen to analyze in this project certainly contain ecofeminist themes such as care, reciprocity, discussion of embodiment, depictions of nature and the relationships between humans and the environment, this project’s scope is not to create a definition for what constitutes an ecofeminist young adult text. Rather, I intend …

Helpful Or Harmful? The Effect Of Heritage Language Use On Perceived Maternal Closeness In United States Immigrant Families, Catalina Valdez

Theses and Dissertations

Language use patterns and parent-child relationship quality in immigrant families are both subject to change over time, and past research on the impact of immigrant children's heritage language use on various measures of well-being yields mixed results. Extending scholarship on heritage language use and immigrant family dynamics, I examine the association between different language patterns in U.S. immigrant families and mother's reports of parent-child closeness. I analyze data from 1,142 mothers when their children are in kindergarten, third grade, and fifth grade using the Early Childhood Longitudinal Study "“ Kindergarten Cohort of 2010-2011. I find little variation in perceived maternal …

Awareness, Acceptance, And Equanimity: Relationships Between Trait Mindfulness, Stress, And Blood Pressure, Gabrielle Renee Chin

Theses and Dissertations

Hypertension (HTN) is associated with stress and unhealthy emotion regulation. Mindfulness-based interventions (MBIs) are said to help address stress-related diseases like cardiovascular disease by impacting stress and emotion regulation, yet studies of MBIs on cardiovascular health show inconsistent findings. Limited research has examined the basic links between trait mindfulness and cardiovascular health, leaving the active components of MBIs in this context unclear. Therefore, the current study examined the relationship between trait mindfulness and blood pressure (BP) in individuals with pre-hypertension (pre-HTN). Latent variables representing two conceptualizations of trait mindfulness -Monitor and Accept Theory (MAT) and Equanimity- were calculated using facets …

Regulation Of Stress Responses And Membrane Morphology By Dspa In Synechocystis Sp. Pcc 6803, Rebekah Kathryn White

Theses and Dissertations

In the world of microorganisms, cyanobacteria are a uniquely skilled powerhouse. They participate in global nutrient and carbon cycling. They have the ability to photosynthesize, which allows them to use sunlight and carbon dioxide to produce cellular energy. However, photosynthesis has a lot of points were environmental stresses can interfere, increasing the chances of oxidative stress and nutrient imbalances that can amplify deleterious effects. One regulator in particular will be the target of this study. DspA, also known as Hik33, is a histidine kinase that perceives and regulates multiple overlapping stress responses. In this project, abiotic stress effects will be …

Identification And Characterization Of Silk Gland Specific Ugt34 Gene In Helicoverpa Zea, Courtney Nicole Wynn

Theses and Dissertations

Uridine diphosphate glycosyltransferase (UGT) is a multigene family of enzymes responsible for catalyzing glycosylation of small hydrophobic molecules. Recently, a genomic analysis of the corn earworm (Helicoverpa zea) identified 45 different UGT genes. We discovered a UGT gene (UGT34) showing high levels of expression exclusively in the silk gland tissue. The expression levels of UGT34 were analyzed in different developmental stages and silk gland sub-segments, revealing that UGT34 is generally expressed at all larval instar stages and largely expressed in the middle and posterior subsegments of the silk glands. The soybean looper (Chrysodeixis includens), another noctuid …

The Effects Of Mechanical Strain On Vascular Calcification And The Canonical Wnt Pathway, Hannah E. Douglas

Theses and Dissertations

Cardiovascular disease is a significant health crisis, representing 32% of deaths worldwide in 2019. Vascular calcification (VC), a major contributor to cardiovascular disease, is a regulated biomineralization process whose exact mechanisms are unknown. Additionally, vascular smooth muscle cells (VSMCs) significantly contribute to VC by undergoing a phenotypic switch and differentiating into osteoblast-like cells. When factors like hypertension cause disturbed laminar flow in the body’s vasculature, the mechanical stress promotes the phenotypic switch and calcification of VSMCs via mechanotransduction. VC is also induced by the Wnt pathway, which is activated via mineral imbalance and mechanical stimulation. However, the exact mechanisms behind …

Loaded Lipid Emulsified Volatile Anesthetics In Canine Primary Hepatocytes, Patricia De Carvalho Ibrahim Obeid

Theses and Dissertations

In the 19th century, halothane hepatitis became a sensitive and well-known subject in human anesthesiology due to the production of a noxious metabolite further discovered, trifluoroacetic acid. Subsequently, isoflurane, enflurane, and desflurane were also investigated for potentially causing hepatitis through the same metabolite. Sevoflurane, however, does not generate trifluoroacetic acid and is quickly conjugated and excreted.

For more than four decades these anesthetics have been experimentally developed for intravenous injection by having added either a lipid or fluorocarbon-based carrier to produce general anesthesia with less drug and faster onset of action. The use of intravenous emulsified halogenated anesthetics as an …

Impact Of A Feeding Strategy And Management Practices On The Health And Welfare Of Pullets And Laying Hens, Gerald Rodney Self

Theses and Dissertations

The overall purpose of this thesis is to understand the impact of management on commercial egg layers, whether that be environmental-related, health-related, or other possible stressors within the pullet and post-peak phases. Furthermore, the study seeks to examine what effects to performance and production these impacts may induce within a commercial layer in differing phases, specifically the pullet and post-peak phases. Chapter two explores into coccidiosis within the pullet phase, which induced by a commercial vaccine, can provide stress to a pullet, lowering protection against infection, and seriously compromising its growth and development into peak lay. Chapter three explores into …

Effect Of Environmental And Geometrical Factors On Microstructure, Desiccation Cracking, And Carbon Dioxide Flux In Clays, Charles Clayton Goodman

Theses and Dissertations

Studying the effects of extreme conditions, such as high temperatures and low humidity, on soil properties is important to various disciplines, including geotechnical engineering, soil science, waste management, crop management, and ceramics. The goal of this research is to investigate the effect of environmental and geometrical factors on microstructure, desiccation cracking, and CO₂ flux in clays. The objectives of this research are threefold. (1) Understand the effects of temperature on the microstructure of clay soils; (2) develop a standardized procedure for studying desiccation cracking in a laboratory setting with reliable and repeatable results; and (3) develop an environmental chamber …