Digital Commons Network^™

The Effect Of Dual Source Premotor Cortex Transcranial Direct Current Stimulation On Muscle Fatigue In Hand Muscles, Valentino Contini

UNLV Theses, Dissertations, Professional Papers, and Capstones

Single source transcranial direct current stimulation (tDCS) has been shown to increase the time to task failure (TTF) fatiguing contractions when applied to the dorsolateral prefrontal cortex (DLPFC) and to the primary motor cortex (M1). The primary purpose was to determine whether dual source tDCS delivered bilaterally over the premotor cortices (pmc-tDCS) could increase the TTF of a fatiguing contraction performed by hand muscles. A double-blind, randomized, SHAM-controlled, crossover design was used for this study with each participant performing two experimental sessions held on separate days a week apart. The only difference between the two sessions was the type of …

Experiment Development And Validation Of A Granular Jamming Robotic Gripper, Jacob R. Dowd

UNLV Theses, Dissertations, Professional Papers, and Capstones

A granular jamming gripper (GJG) is widely known as a Universal Gripper because of the wide range of objects that it can grasp and the simplicity of control, design, and manufacturing. Despite multitude of research improving the GJG, here, we focus on the base version of the GJG and attempt to glean the range of objects that it may reliably grasp. Despite the limited range of objects, which were a sphere, rectangular prism, and cylinder, we gleaned geometric properties as it relates to successful and unsuccessful grasping. This was based on the two types of testing: push and pull testing …

An Analysis Of Truancy Causes And Prevention Programming In Clark County, Nevada, Jennifer Ashley Fletcher

UNLV Theses, Dissertations, Professional Papers, and Capstones

In the United States truancy prevention is lacking two key elements to success; research that explains the causes of truancy and empirical evidence for best practices of truancy prevention. Truancy has been a problem in academics since the early 1900’s, when truancy became illegal. Since then, truancy rates have continued to see a steady increase, and today approximately 10% of public school students in the United States are truant every day (Maynard et al., 2017). To combat this problem, research needs to be conducted to understand why truancy happens. However, there is a severe lack of research on this topic; …

Screening Of Orthodontic Patients And Age-Matched Non- Orthodontic Samples For High-Risk Oncogenic Human Papillomavirus (Hpv) Strains, Hunter Hinton

UNLV Theses, Dissertations, Professional Papers, and Capstones

Introduction: The human papillomavirus (HPV) is known to cause cancer in several tissues and organs, including the cervix and the oral cavity. Several oncogenic or high-risk strains have been identified, which include HPV16 and HPV18.However, other research has demonstrated that additional oncogenic, high-risk strains exist - including HPV31, HPV33, HPV35, HPV52 and HPV58, although much less is known about their prevalence. Based upon this lack of knowledge, the primary objective of this project is to address the prevalence of these strains among pediatric and adult patients through screening of saliva samples from the UNLV-SDM and orthodontic clinic populations.

Methods: The …

Pain Management Series For Stroke: Identifying Teaching Methods To Increase Clinical Self-Efficacy For Occupational Therapy Doctoral Students, Apasara Jittprasert

UNLV Theses, Dissertations, Professional Papers, and Capstones

Purpose

Post-stroke pain has been identified as a significant challenge for individuals experiencing a stroke. Occupational therapists play a crucial role in the complex treatment of post-stroke pain but often face challenges due to a lack of self-efficacy in implementing treatments for stroke-related pain. This project’s purpose was to,1) to identify which teaching methods are effective for increasing clinical self-efficacy in doctoral occupational therapy students for implementing pain management treatment for individuals’ post-stroke and 2) to increase reported clinical self-efficacy levels among these students following the completion of a pain management educational program for stroke pain.

Methodology

This project recruited …

Liminal Embodiment And The Changing Parental Body, Torisha Khonach

UNLV Theses, Dissertations, Professional Papers, and Capstones

This dissertation sits at the intersection of sociology of the body, parenting, and life course to examine how the role and status of becoming a parent shape individuals' embodiment. Grounded in research highlighting body and embodiment as crucial, yet understudied aspects of social experiences, my study views biological changes as rooted in the social, where symbolic messages shape how parents think and understand their bodies and embodiment. The transition to parenthood serves as a unique lens for analyzing embodiment, as pregnancy, barriers to assisted reproductive technology, and adoption serve as evidence for the intersection of physical and social changes. My …

Characterization Of Fibronectin Adhesion Isolated Dental Pulp Progenitor Cell Populations, Heoijin Kim

UNLV Theses, Dissertations, Professional Papers, and Capstones

Background: The DPSC constitutes a significantly small population, comprising approximately 1% of the total cells in the pulp tissue. Therefore, it is imperative to successfully culture and populate DPSCs in vitro before utilizing them for therapeutic purposes. Understanding DPSC heterogeneity is crucial for innovative regenerative therapies, prompting the investigation of mixed populations using fibronectin as a biological marker. It is reported that cellular phenotype and biological function may undergo alterations as cells replicate in a cultured environment or the substrate to which the cells adhere.

Objectives: In this study, we compared and analyzed the impact of various isolation methods on …

Unraveling The Relationship Between Social Vulnerability Index And Covid-19 Prevalence In Southern Nevada, Andrea Lopez

UNLV Theses, Dissertations, Professional Papers, and Capstones

The COVID-19 pandemic was a catastrophic global event that exacerbated public health issues and disparities, especially in socially vulnerable communities. Thus, this study examines areas classified by the CDC's Social Vulnerability Index (SVI) metric, which assesses vulnerable communities experiencing adverse events through sixteen social determinants that impact health. The purpose of this study will be to determine if (1) COVID-19 testing rates and/or COVID-19 vaccination rates mediate SVI and COVID-19 prevalence rates and (2) if COVID-19 testing rate and COVID-19 vaccination rates serially mediate SVI and COVID-19 prevalence rates. In order to achieve this, census tracts within Southern Nevada will …

Self-Perception And Positive Stereotype Endorsement, Aileen Lovitt

UNLV Theses, Dissertations, Professional Papers, and Capstones

The origin and reasoning behind the use of racial stereotypes has been a point of interest for researchers over the years. Many different theories have been proposed including those related to cognitive, evolutionary, and motivational explanations. However, most of these theories and the research backing them primarily focus on negative stereotyping. The origin of positive stereotyping, which also has negative implications associated with their use, has not been evaluated fully. Previous research has suggested that the motive to preserve self-worth and positive self-concept may play a role in stereotype endorsement. Two studies were conducted with the purpose of investigating whether …

Photoelectic Driven Decomposition Of Uracil Via Hard X-Ray Irradiation, Trimaan Malik

UNLV Theses, Dissertations, Professional Papers, and Capstones

Radiation damage into biological samples creates substantial challenges across a wide range of fields, from biochemistry to materials science. This comprehensive study investigates the effects of x-ray irradiation on uracil, the only nucleobase exclusive to Ribonucleic acid (RNA), to understand how doping with 10% (by mass) of specific powdered elements impacts the sustained radiation damage. The experiments were conducted at the Brockhouse Undulator Beamline of the Canadian Light Source synchrotron. Virgin and doped uracil samples were irradiated with hard x-rays, above their respective absorption edges, and studied with x-ray diffraction to compare their decomposition behaviors. The Uracil reflections on the …

Compliance And Efficacy Of Orthodontic Medicaid In Southern Nevada: A Retrospective Study, Troy Mccartney

UNLV Theses, Dissertations, Professional Papers, and Capstones

Objective: The study’s main objective is to evaluate efficacy and compliance in Medicaid orthodontic patients compared to private insurance and cash (self-pay) patients in Southern Nevada. In addition, the paper will study the trends in approval selection such gender, age, race/ethnicity, and case type. This information will be used to discuss the barriers that Medicaid patients face and offer solutions for the issues found in the orthodontic Medicaid system.

Introduction: Medicaid coverage was brought forward by the Federal Social Security Act in July of 1965. Since then, there have been many discussions on how orthodontic treatment should be covered under …

Age, Gender, And Sexual Orientation And Their Effects On Online Dating Motivations, Jenna Leigh Mcpherson

UNLV Theses, Dissertations, Professional Papers, and Capstones

Online dating and dating apps are becoming more common as a means to meet a romantic or sexual partner (e.g. Rosenfeld, Thomas, & Hausen, 2019). Previous literature on the motivations for why people use dating apps and how they differ among participants of varying age, gender, and sexual orientation has not allowed for comparisons across these groups, or shows conflicting findings. In order to consolidate existing literature and further explore the topic, I conducted both a meta-analysis and meta-synthesis. The meta-analysis demonstrated a gender difference in the motivation of casual sex, such that men scored higher than women. The meta-synthesis …

Dismantling The Stigma Of "Strong Black Girl" & "Strong Black Boy:" Cultural And Gender Differences In Trauma And Suicidality Among Black Adolescents, Tiffany Mosier-Hunter

UNLV Theses, Dissertations, Professional Papers, and Capstones

Trauma exposure has been linked to a plethora of negative outcomes, including suicidality. Despite the abundance of research on the effects of trauma, little is known about its relationship with suicidality among adolescents. Moreover, even less research examines cultural and gender specific risk factors among Black adolescents. This study was founded on the cultural model of suicide, and the gendering of suicide theory, suggesting that suicidality in minority populations is influenced by cultural experiences (i.e., traumas) and perceptions of suicide, as well as gender differences that dictate where Black adolescents fall on the suicide spectrum. Using archival data (e.g., YRBSS) …

Occupational Therapy-Led Development Of Life Skills Coaching Course On Resources For Educational Attainment To Foster Independent Living Among Youth Aging Out Of Foster Care, Joana Naguit

UNLV Theses, Dissertations, Professional Papers, and Capstones

This capstone project focused on addressing the competence of foster youth in their independent living skills, particularly, educational attainment skills. Delivered in a blended learning format, a life skills coaching course focused on educational attainment resources was proposed to address the long-term challenge of poor educational attainment among foster youth at Bamboo Sunrise, a specialized foster care agency in Henderson, NV. Participants completed brief didactic work in the form of video and PowerPoint lectures followed by the evaluation of their comprehension and skills through questionnaires and competencies. Competency evaluations simulated hands-on workshops structured weekly to promote skill mastery and application …

Providing Parent Education On School-Based, Social-Emotional Learning Programs To Increase Parents’ Self-Efficacy For Managing Aversive Behaviors, Cerena Obra

UNLV Theses, Dissertations, Professional Papers, and Capstones

There is limited evidence on the imperative role that caregivers play in social-emotional learning development for effective social-emotional learning program implementation despite their crucial influence on childhood development. This doctoral project explored the effects of parent education for two school-based, social-emotional learning program techniques on caregivers’ self-efficacy in managing aversive behaviors. This doctoral project discusses aversive behaviors, social-emotional learning, the Zones of Regulation and Friendzy social-emotional learning programs, caregiver education, and caregiver self-efficacy. This project highlights the importance of including caregivers in effective school-based social-emotional learning programs by exploring caregivers' self-efficacy when provided education on school-based social-emotional learning techniques.

Investigations Into The Relationship Between Menopause And Alzheimer’S Disease Pathology In A Mouse Model With Ovarian Follicle Depletion, Amanda M. Leisgang Osse

UNLV Theses, Dissertations, Professional Papers, and Capstones

Alzheimer’s Disease (AD) currently affects about 6.9 million Americans, with over two-thirds of those individuals being women. Interestingly, changes in the brain indicative of AD coincide with the onset of menopause. Post-menopausal women have significantly higher levels of AD pathologies, including amyloid beta and hyperphosphorylated tau, than pre-menopausal women. To investigate the relationship between AD pathologies and menopause, we induced menopause-like state in an AD mouse model, APP/PS1, by treatment with 4-vinylcyclohexene diepoxide (VCD) to accelerate ovarian follicle depletion. To monitor the transition to menopause, vaginal lavages and cytology was performed to determine if mice reached anestrous. Both female APP/PS1 …

Increasing Swim Instructors' Perceived Knowledge Of Sensory-Based Strategies When Coaching Children Who May Have Sensory Differences, Gabrielle Palmer

UNLV Theses, Dissertations, Professional Papers, and Capstones

Although swim instructors are solely taught water safety regulations and correct swimming techniques, they are nonetheless viewed as mentors by the kids they work with. They are required to finish both their basic swim instructor (BSI) course and their cardiopulmonary resuscitation (CPR) certification, which primarily covers the fundamentals (American Red Cross Training Services, 2023; Kraft & Leblanc, 2018). However, neither provides a method of teaching swimming to children who might have sensory processing differences. This lack of education may affect both the child's participation and the swim instructor's capacity to impart knowledge. Research revealed that swim instructors are not very …

Computational Study For Tissue-Specific Dosimetric Quantities Of Secondary Radiation For Mars Exploration, Sungmin Pak

UNLV Theses, Dissertations, Professional Papers, and Capstones

The two main sources of primary space radiation, Galactic Cosmic Rays (GCRs) and Solar Particle Events (SPEs), encompass a spectrum of ions, ranging from protons (Z=1) to nickel ions (Z=28), with energies spanning from less than 1 keV to exceeding a few TeV. While SPEs represent sporadic events primarily comprised of a high flux of low- to intermediate-energy protons, GCRs are characterized by continuous low flux of diverse ions with higher energies, peaking in intensity near the solar minimum. During a Mars mission, astronauts will encounter primary particles of high energy from GCR and SPE spectra, capable of penetrating spacecraft …

A Multiple Case Study On Student-Centered Teaching And Educational Equity For Diverse Learners, Lei Ping

UNLV Theses, Dissertations, Professional Papers, and Capstones

Student-centered teaching (SCT) has been the dominant education philosophy in the U.S. K-12 education. However, the definition and practice of SCT have been rooted in western education contexts. Since students in U.S. schools become more and more diverse, it remains unclear how SCT works for diverse learners. This research delved into the perceptions and implementation of SCT by teachers in elementary charter schools, emphasizing their approach in classrooms with diverse learners. The study also aimed to uncover any disparities in how teachers perceived and applied SCT when educating diverse learners compared to non-diverse learners. Guided by critical reflection for transformative …

Plant-Plant Interaction In Early- Vs. Late-Successional Varieties Of The Hawaiian Landscape-Dominant Tree, Metrosideros Polymorpha, Tomoko Sakishima

UNLV Theses, Dissertations, Professional Papers, and Capstones

Plant-plant interactions play an important role in assembling plant communities. Interactions between neighboring plants can vary as a result of the genetic relatedness of neighbors, impacting rates of growth and patterns of resource allocation. When growing alongside close relatives, some species decrease their growth in a form of cooperation, while others grow faster through facilitation. A complication of plant interaction studies arises because decreased growth in the presence of close relatives can also be due to competition for resources, which increases with phenotypic similarity. Further complicating matters, mycorrhizal fungi, through their connections with plant roots, may strongly influence plant interactions. …

Identifying Disease-Related Gene-Environment Interactions Based On Method Of Moments, Linchuan Shen

UNLV Theses, Dissertations, Professional Papers, and Capstones

Human diseases are often caused by a complex interplay of multiple factors, including genetics and environmental factors. These factors can play critical roles in the development and progression of diseases. Although genome-wide association studies (GWAS) have successfully identified many genetic variants associated with human diseases, the estimated effects of these variants are small and can explain only a relatively small portion of the heritability of the underlying diseases.

Detecting gene-environment interactions (G × E) can shed light on the biological mechanisms of diseases. However, most existing methods that investigate G × E only look at how one environmental …

Quaternary Ammonium Compound Resistance Of Klebsiella Pneumoniae And Klebsiella Quasipneumoniae Strains Isolated From The International Space Station, Natasha Svetlana Sushenko

UNLV Theses, Dissertations, Professional Papers, and Capstones

The International Space Station (ISS) has been continuously inhabited for twenty-three years and harbors a diverse population of microorganisms under conditions of microgravity, elevated radiation, and relative isolation, including Biosafety Level 2 (BSL-2) opportunistic pathogens. To sanitize surfaces on the ISS, astronauts use a combination of four antimicrobial quaternary ammonium compounds (QACs). As the stresses of space flight are known to stimulate virulence and antimicrobial resistance in bacteria, the frequent use of QAC disinfectants on the ISS is of concern to NASA. This not only poses risks to astronauts during future long-term space travel, but there is also a concern …

Preservice Teachers' Pk-12 Educational Field Trip Experiences: Teaching Beyond The Classroom, Cecilia A. Turman

UNLV Theses, Dissertations, Professional Papers, and Capstones

The purpose of the study was to investigate preservice teachers’ (PSTs) attitudes and beliefs towards their PK-12 field trip (FT) experiences as students, their memories, influences in their lives, impact on their educational approaches and career choices, as well as how, as future teachers, they would implement FTs to their future students to provide feedback on FTs’ training for preparation programs. Rationale: Anderson et al. (2010) criticized teacher preparation programs’ lack of teacher training to implement educational FTs and contended that instructors’ FTs experiences as students may have influenced the way they plan and carry out educational FTs. John Dewey’s …

Biopsychosocial Occupational Therapy Interventions For Complex Regional Pain Syndrome – A Pilot Manuscript, Cinthia Hartman

UNLV Theses, Dissertations, Professional Papers, and Capstones

Occupational therapists (OTs) have an essential role in the treatment of upper extremity Complex Regional Pain Syndrome (CRPS) in outpatient therapy settings. Occupational therapy (OT) guidelines and research focus treatment on the Budapest Criteria’s biological signs and symptoms. The International Association for the Study of Pain (IASP) now recognizes CRPS as a primary chronic pain condition and not an autonomic disorder, as it was thought to be in the past. This recognition, along with the psychological and social impacts of the condition, highlight the need for updated OT treatment interventions incorporating a biopsychosocial model. Combining evidence-based CRPS OT interventions for …

A Comparison Of Spinal Reflex Function And Morphological Adaptations Of The Achilles Tendon Between Individuals Chronically Post-Stroke And Healthy Controls, Migi Contreras, Mira Seekins, Johanna Mendez, Trevor Diez

UNLV Theses, Dissertations, Professional Papers, and Capstones

Purpose/Hypothesis: The hallmark gait deviation in individuals with post-stroke hemiparesis is slow walking speed. Reduction in gait speed after stroke is influenced by decreased propulsive forces, which may likely be related to impaired spinal circuit function and spasticity of the paretic plantarflexors. Chronic muscle tone maladaptations in paretic ankle plantarflexors can result in altered Achilles tendon (AT) morphology, therefore leading to altered mechanical properties, force transmission capabilities and subsequent insufficient propulsive forces during walking. The purpose of this study is to characterize the chronic maladaptations in both the spinal Ia afferent loop excitability and AT morphology after stroke lesions in …

The Impact Of Anatomy Academy In Underserved Las Vegas Elementary Schools, Jean Angeles, Edgar Armengual, Katrina Myers, Perceval Vollmer

UNLV Theses, Dissertations, Professional Papers, and Capstones

Anatomy Academy is an interactive, service-learning experience that allows doctoral physical therapy students to pose as educators for elementary-aged adolescents. Through instructional and activity-based learning, mentors formulated the program to encase anatomical, physiological, nutritional, and general health and wellness topics that translate into overall healthy behaviors. The experiment enveloped 7 major sectors of anatomy, including the musculoskeletal system, cardiovascular system, pulmonary system, oral cavity/nutrition, gastrointestinal system, sensory system, and central nervous system. Throughout the length of the program, the doctoral candidates reviewed the quality of the content delivered, the engagement of the students and staff, and the effects this had …

Modulating Cortical Excitability To Improve Functional Movements In Individuals With Patellofemoral Pain: A Randomized Controlled Trial, Jeno Aquino, Bryce Broadwell, Connan Wallace, Makenzie Whimple

UNLV Theses, Dissertations, Professional Papers, and Capstones

Purpose/Hypothesis: Persons with patellofemoral pain (PFP) often exhibit increased knee valgus during functional tasks that is traditionally addressed by strengthening weak hip musculature. However, research related to this topic has revealed altered cortical reorganization in individuals with PFP contributes to dysfunctional movements and underscores the critical role of central neural control in this condition. Transcranial direct current stimulation (tDCS) is a neuromodulatory technique that alters cortical excitability to enhance neuroplasticity. Research using tDCS priming supports its feasibility as a possible treatment for other musculoskeletal conditions. However, its application specifically targeting the corticomotor function of the gluteal musculature in individuals with …

Effects Of Chronic Diabetes And Attentional Focus On Performance And Learning Of A Novel Stabilometer Balance Task, Rebeca Carolina Armagnac Gonzalez, Yinny H. Lee, Alicia Marie Letkiewicz, Meiko Nagano Mamauag

UNLV Theses, Dissertations, Professional Papers, and Capstones

Background and Purpose: Chronic diabetes is a prevalent systemic disease that impairs physical functioning and often leads to increased risk of falls. Adopting an external focus of attention during motor skill practice has been shown to improve learning outcomes, however, it has not been examined in this population. We examined how attentional focus instructions (internal vs. external) affect balance performance and learning in older adults with and without diabetes.

Methods: Fifty-three older adults (27 with diabetes, 63.7±7.0 years) participated in the randomized, pre-post intervention study. The balance training involved 50 practice trials of a stabilometer task that was novel to …

A Low Dose Of Electro-Psychedelic Treatment Increases Neuronal Dendritic Arborization And Filopodic Spine Density, Elaine Aquino Vasquez

UNLV Theses, Dissertations, Professional Papers, and Capstones

Neuropsychiatric disorders remain a formidable challenge to the global healthcare system, necessitating innovative treatments to address their complex pathophysiology. Alternative therapeutic approaches, including electroconvulsive treatment (ECT) and psychedelics, have gained attention for their capacity to relieve a broad range of symptoms. ECT is a long-standing effective therapy for patients, especially treatment-resistant ones. Psychedelics, like psilocybin, can induce profound and sustained therapeutic effects. The limited understanding of their mechanisms of action, compounded by the negative stigma surrounding ECT and psilocybin, prevents them from being used as adjunct agents. ECT and psilocybin promote synaptic plasticity and modulate neural remodeling, yet their comparative …

Assessing Impact Of Food Structure On Oral Tribology And In-Vitro Digestion Of Dairy Products, Lamis Ali

All Graduate Theses and Dissertations, Fall 2023 to Present

In this research, we focused on understanding the critical elements impacting consumer experience and the nutritional value of dairy products, specifically their texture, mouthfeel, and protein breakdown in the gastrointestinal tract. Our study aimed to accomplish two main goals. First, we performed analysis of the tribological attributes of various commercially dairy products. The second objective was to investigate the process of disintegration and protein release in selected dairy products.

The study included an assessment of eight dairy products of varied consistencies: solid like cheddar, cheese curd, and parmesan; semi-solid such as cottage cheese, ricotta cheese, and yogurt; and liquid represented …