Digital Commons Network^™

Analysis Of 316 Omnitrophota (Op3) Genomes Reveals A Diverse And Ubiquitous Candidate Phylum Of Putative Syntrophs, Predators, And Free-Living Nanobacteria Encoding Giant Open-Reading Frames., Cale O. Seymour

UNLV Theses, Dissertations, Professional Papers, and Capstones

Candidate bacterial phylum Omnitrophota has never been isolated and is poorly understood. In this study, we explored the genomics, phylogeny, taxonomy, distribution, cell size, and predicted physiology of Omnitrophota based on 316 genomes. Phylogenomic concordance identified seven classes accommodating 144 species. Calibration of genome-based taxonomy to ribosomal SSU profiling revealed most Omnitrophota classes are prevalent in the Earth Microbiome Dataset, particularly in soils and sediments. Fluorescence-activated cell sorting and differential size filtration experiments showed ultra-small (<400 >nm) cells are common across the phylum, as are parasitism-related genes, including a conserved tight adherence (Tad) complex and ATP/ADP translocase. However, nucleotide and …

Biotransformation Of Trace Organic Compounds Via Microbial Ammonia Oxidation In Biofiltration Systems For Water Reuse, Nicholas Babcock

UNLV Theses, Dissertations, Professional Papers, and Capstones

The use of ozone-biofiltration (BAF) for water reuse has recently been viewed as an attractive option due its low cost and ability to achieve high quality effluent. However, one challenge that is particularly problematic for ozone-biofiltration is the occurrence of trace organic compounds (TOrCs), such as pharmaceuticals and personal care products, in domestic wastewater, primarily due to their uncertain public health impacts. These TOrCs might be degraded by three ammonia oxidizing microorganisms (AOMs), including ammonia oxidizing bacteria (AOBs), ammonia oxidizing archaea (AOAs), and Comammox that have been found in biofiltration systems. Cometabolism, the fortuitous biodegradation of compounds by enzymes used …

Investigating Ancient Maya Late Postclassic Period Households And The Associated Function Of The Buildings At Santa Rita Corozal, Belize, Melissa Badillo

UNLV Theses, Dissertations, Professional Papers, and Capstones

Previous archaeological research conducted by the Corozal Postclassic Project (1979-1985) focused primarily on the Postclassic Period at the site of Santa Rita Corozal in northern Belize. Through that research, Santa Rita was demonstrated as an important Postclassic Maya city which likely served as the capital of the ancient Maya province of Chetumal. Given the major reorganization that occurred in the Maya Lowlands at the end of the Classic Period, the assessment of a Postclassic site would demonstrate what, if any changes in the organization of Postclassic Period sites, took place. An extensive analysis of the associated artifact assemblages of six …

Presumed Illegal Microaggressive Experience (Prime): A Microaggression Targeting Latinx Individuals, Aldo M. Barrita

UNLV Theses, Dissertations, Professional Papers, and Capstones

In the US, people of color (PoC) are consistently the targets of microaggressions, a form of everyday racism (Pierce et al., 1977; Chavez, 2013) manifested in brief, commonplace, daily slights and indignities (Sue et al., 2007). After the 2016 elections, Americans immediately reported an increase in social tensions across racial groups (Pew Research, 2017). Latinxs, in particular, reported a steep rise in experiences with racial and ethnic discrimination (Gomez & Perez Huber, 2019; Jones et al., 2019), particularly around the context of immigration status (Santos et al., 2021). No previous research, however, has explored the experience of assumed illegality based …

Relationships Between Mindfulness, Nonacademic Factors, Stress, And Test Performance: A Cross-Sectional Study, Rebecca A. Baumeister

UNLV Theses, Dissertations, Professional Papers, and Capstones

Successful test performance is essential to nursing students. Poor performance comes with consequences such as inability to progress or removal from the program, leading to attrition. The influence of academic factors on test performance have been widely researched and stress is known to hinder it, yet other factors may also impact test performance.

Dispositional mindfulness has the potential to support test performance, but no known studies have focused on these two variables among undergraduate nursing students. A gap also exists in relation to the influence of nonacademic factors on undergraduate nursing students’ test performance. Due to the ongoing nursing shortage, …

Job Burnout: An Examination Of Outpatient Clinics, Aysa M. Chavarria

UNLV Theses, Dissertations, Professional Papers, and Capstones

The purpose of this study was to examine job burnout of medical providers in outpatient clinics. Job burnout is a psychological syndrome resulting from job interpersonal stressors; it is measured using three dimensions: (1) emotional exhaustion – feelings of being emotionally overextended and exhausted by one’s work, (2) depersonalization -a unfeeling and impersonal response toward patients, and (3) personal accomplishment – feelings of competence and achievement in one’s work (Maslach & Jackson, 2020). Using a convenience sample, healthcare providers in Southern Nevada were asked to participate. The study was approved by the University of Nevada, Las Vegas, Internal Review Board …

Examining Technology’S Impact On Hotel Operations: A Systematic Review Of Hospitality Research Literature, Xinru Chen

UNLV Theses, Dissertations, Professional Papers, and Capstones

In the hospitality industry, technology’s impact on hotel performance is a central topic since it is closely related to operators’ budget allocation and business decisions. However, former studies have devoted little attention to this issue and have exhibited mixed attitudes, which makes it more difficult for hotel operators to make their technology adoption decisions. To determine the scope of technology’s implication on operations, this study will conduct a systematic review and examine technology’s impact on hotel performance based on the empirical evidence given by scientific publications in the hospitality industry from the last 20 years. The data was obtained from …

An Analysis Of Job Competencies And Job Descriptions Associated With Admissions Counselors/Recruiters At 4-Year Public And Private Institutions As Prescribed By Nacac In 2000 And Its Relevance In 2018, Sebern Coleman, Jr.

UNLV Theses, Dissertations, Professional Papers, and Capstones

The role of admissions counselors has become pivotal to the mission of enrollment management in higher education. Admissions Counselors have evolved from serving as personnel that provides counseling to students to one that expands to include marketing to concurrent high school classes and students. As a result, the discipline has seen an increase in the number of counselors entering the workforce and has experienced a steady progression of career opportunities and advancement in the field of admissions (Phair, 2014). Nonetheless, college graduates are more likely to apply for these positions though limited support for career advancement exists due to these …

Analysis Of Microscopic Objects Using Computer Vision Methods, Yuan Dao

UNLV Theses, Dissertations, Professional Papers, and Capstones

As an essential and powerful tool to observe living organisms, three-dimensional fluorescence microscopy is widely used in biological research and diagnosis. The 4D fluorescence microscopy data can be obtained using time-lapsed videos of 3D images. To analyze and extract useful information from the increasingly large and complex biological image dataset, efficient and effective computational tools are in need but still lagging behind. In analyzing biological data, two major challenges are faced. First, time-lapsed fluorescence microscopic images typically have a low SNR. Second, biological objects often change their morphology and internal structure frequently. As such, conventional image processing methods may not …

Hyperpolarizability Dispersion Measured For Carbon Disulfide Vapor, Rodrigo N. Fernandez

UNLV Theses, Dissertations, Professional Papers, and Capstones

The second hyperpolarizability (γ) of carbon disulfide (CS2) was measured by gas phase electric-field-induced second harmonic generation (ESHG), for laser wavelengths in the range of 765-1064 nm. The observed hyperpolarizability is decomposed into electronic (γ^e) and vibrational (γ^v) contributions, and the dispersion curve for γ^eis extrapolated to the static limit, with the result γ^e_0 = 12558 ± 93 atomic units. The results of this experiment agree with other recent nonlinear optical measurements and theoretical calculations.

It’S Not You, It’S Me: Measuring Erotic Self–Focus, Evan Fertel

UNLV Theses, Dissertations, Professional Papers, and Capstones

Research suggests the presence of a non-relational aspect of women’s sexuality wherein a focus on oneself may be linked to elevations in sexual desire/arousal. Some theorists have even asserted that women may be, in some ways, their own sexual objects. Building on a previous exploration of what is now termed Erotic Self-Focus (ESF; Fertel, 2015), the present study developed a refined measure of ESF to further assess the validity and nature of this new construct. An exploratory factor analysis revealed four factors: Arousal to Own Body, Self/Own-Gender Focus vs. Partner/Other-Gender Focus, Self-Focused Arousal – Physical, Self-Focused Arousal – Mental. Although …

Defining Problematic School Absenteeism: Identifying Youth At Risk, Mirae J. Fornander

UNLV Theses, Dissertations, Professional Papers, and Capstones

Study 1: School attendance is an important foundational competency for children and adolescents, and school absenteeism has been linked to myriad short- and long-term negative consequences, even into adulthood. Many efforts have been made to conceptualize and address this population across various categories and dimensions of functioning and across multiple disciplines, resulting in both a rich literature base and a splintered view regarding this population. This article (Part 1 of 2) reviews and critiques key categorical and dimensional approaches to conceptualizing school attendance and school absenteeism, with an eye toward reconciling these approaches (Part 2 of 2) to develop a …

Attention Bias In Irritability: A Social Information Processing Perspective, Breanna Garcia

UNLV Theses, Dissertations, Professional Papers, and Capstones

Social information processing (SIP) theory suggests a framework for understanding how individuals make sense of their world—from the cognitive tasks of perception and problem solving to the emotional tasks of integrating this information with one’s goals, motivational state, and arousal regulation. This framework has been integral for better understanding the etiology behind certain psychopathologies (such as depression or disruptive behavior disorders) as it is thought that bias early in attentional processes may have trickle down effects on later processing and decision making (Dodge, 1993). It is known that the attention biases early in the SIP model (e.g., encoding biases) differ …

Turning Up The Sound! Senior-Level Sonographers' Perspectives On The Workforce Readiness/Competency Of Entry-Level Sonographers In The Workplace, Janice L. Glasper

UNLV Theses, Dissertations, Professional Papers, and Capstones

There has been a longstanding preoccupation with the workforce readiness and competency of our nation’s graduates since the release of the National Commission on Excellence in Education’s, April 1983 landmark report, A Nation at Risk: “The Imperative for Educational Reform”, which indicated that the educational foundations of our society were being eroded by a rising tide of mediocrity that threatened our very future as a Nation and a people. Now, more than 35 years since the release of A Nation at Risk, it appears that little has changed. Extensive research continues to report that graduates of post-secondary institutions are unprepared …

Effects Of A Discourse Intervention On End-Of-Life Knowledge And Attitudes Of Bsn Nursing Students, Jayme Gullone Haynes

UNLV Theses, Dissertations, Professional Papers, and Capstones

Introduction. A number of challenges exist to providing effective, formalized end of life (EOL) education for undergraduate nursing students. Despite advanced resources provided by the End-of-Life Nursing Education Consortium (ELNEC), many nursing program curricula are overloaded with content and have little opportunity to incorporate other content and information.

In addition, the topic of EOL care may elicit significant emotional responses from nursing students with numerous studies indicating nursing students experience fear and anxiety when caring for patients at EOL. Recent research demonstrates the need to approach emotionally laden topics such as EOL care from a pedagogical perspective that acknowledges and …

An Orchestral Percussionist's Guide To Instruments Of The Caribbean, Lucas Brust

UNLV Theses, Dissertations, Professional Papers, and Capstones

Sparked by the introduction of Janissary percussion into the works of the First Viennese School, composers have been steadily expanding the musical responsibilities and tonal palette of the orchestral percussion section. Most institutions of higher education extensively address the traditional orchestral percussion instruments and only relatively recently have these institutions begun incorporating the more “exotic” percussion instruments from various indigenous musical traditions. With the resources and proposed performance practices suggested in this document, orchestral percussionists can gain the knowledge and familiarity to identify the instruments by name and construction, demonstrate fluency in technique and sound production, and display basic understanding …

Use Of Conductor Directives In Rehearsals By Conductors Of Professional Music Ensembles, David Coyner

UNLV Theses, Dissertations, Professional Papers, and Capstones

This descriptive study catalogues the auditory directives of eight conductors of professional ensembles and compares their rehearsal time spent on directives and ensemble response. Rehearsals of eight conductors of professional ensembles were observed through commercially available videos through rental or YouTube. The conductors are Leonard Bernstein, Karl Böhm, Frederick Fennell, Valery Gergiev, Herbert von Karajan, Carlos Kleiber, Georg Solti, and Leopold Stokowski. Conductor directives and ensemble responses are marked based on directive type, compiled into an observation log, and timed to track frequency and duration. The directive and ensemble response types are academic, modeling, instruction, nonmusical, approval/disapproval, and performance. Results …

A 155-Year Tree-Ring Based Record Of Warm And Dry Snow Droughts For The Cascade Range, Usa, Laura A. Dye

UNLV Theses, Dissertations, Professional Papers, and Capstones

Contributing 50-80% to the surface water for the region, mountain snowpack is a pillar of the hydrologic cycle in the western US, and is projected to decrease to 44% by 2100 in the Cascade Mountains alone. The western US has recently been identified as a global snow drought hot spot, exhibiting more frequent, intensified, and lengthened snow drought events in recent decades. Only recently has the need to understand the types of snow droughts and their driving mechanisms become critical to understand and quantify. Recent research suggests ‘warm’ snow droughts caused by winter precipitation falling as rain rather than snow …

Is Pristine Inner Experience Linked To Biology? An Examination Of Experience Across The Menstrual Cycle Among Women With Premenstrual Distress, Alek E. Krumm

UNLV Theses, Dissertations, Professional Papers, and Capstones

The link between mind and biology is intuitively known: We notice changes in our mood and behavior when hungry, in pain, or under the influence of substances. Yet, the specifics of this link—for example, how changes in biology affect directly apprehended conscious experience— are not well known. The present study was an exploratory attempt toward filling that gap by using a state-of-the-art, beeper-driven method for exploring directly apprehended conscious experience (Descriptive Experience Sampling; DES) across one of the most predictable and wellknown biological cycles: menstruation. We screened approximately 300 college women to identify those who reported clinically significant symptoms of …

Functional Π-Organogelators: From Nanoribbons To Organic Phosphors, Sae Hui Lee

UNLV Theses, Dissertations, Professional Papers, and Capstones

π-Conjugated systems have been receiving notable attention in the field of organic material chemistry due to their interesting optical properties, assembling properties, and potential application in optoelectronics. Among various self-assembly methods, organogelation has been known to allow facile and easily reproducible molecular assembly. This work focuses on creating new π-organogelators with various side group modifications which in result allow proper tuning of the optical properties along with an effective self-assembly upon gelation. The research comprises of two chapters: 1) the first chapter focuses on N-heteroacenes (NHAs) with gelation property and 2) the second chapter investigates gelation induced phosphorescence (GIP) of …

New Nurse Reality Shock & Early Burnout: Can Role Transition Education Received During New Nurse Residency Positively Affect Satisfaction?, Bonnie L. Stolzman

UNLV Theses, Dissertations, Professional Papers, and Capstones

Newly licensed nurses are at incredibly high risk for reality shock leading to early burnout which results in many of them resigning their positions or leaving nursing altogether. Common feelings leading to reality shock often involve exhaustion, cynicism, depersonalization, decreased self-efficacy, and decreased job satisfaction. The result of early burnout presents significant financial strain and quality concerns for our already struggling healthcare systems. In the 1960s and early 1970s, Marlene Kramer brought her research regarding newly licensed nurses and their experience of “reality shock” to publication. Kramer felt strongly that reality shock was a key factor that led newly licensed …

The Butterfly Lovers’ Violin Concerto (1959), Ying Zhang

UNLV Theses, Dissertations, Professional Papers, and Capstones

The study examines the importance of the Butterfly Lovers’ violin concerto (1959) by He Zhanhao and Chen Gang and the related research on its musical and culture context in China, focusing on how students from the Shanghai Conservatory of Music explored the use of Chinese traditional music elements on a western instrument, the violin in the 1950s. The dissertation discusses three aspects: the social and compositional introductory background, composition analysis and the influence of this piece in the eastern and western musical worlds. In the first chapter, I give a brief introduction to the piece. When the new People’s Republic …

Rotten With Prediction, Serena Raquel Hicks

UNLV Theses, Dissertations, Professional Papers, and Capstones

This project focuses on the relationship between religion and technology as it is portrayed in Science Fiction (SF). This thesis explores the SF genre rhetorically by examining the 2002 movie Minority Report (MR), which signaled the importance of surveillance and the need to predict future crimes following 9/11. The events of 9/11 played a significant role in post 9/11 SF films, which reflect and critique our communal and cultural values. 9/11 created a new relationship between the U.S justice system, predictive technologies (PTs), and data gathering. Through the Bush Doctrine of “preemptive action,” the U.S government attempted to use Dataism, …

An Assessment Of Hotel Guests’ Perceptions Of Preventive Safety Measures In The Era Of Covid-19, Un Hyeok Ko

UNLV Theses, Dissertations, Professional Papers, and Capstones

In the era of COVID-19, hospitality was one of the industries that was most severely impacted by the virus. Spread of the virus was rapid enough to force hotels to close properties worldwide, and hotels were required to adopt safety measures and protocols in order to re-open or remain open. New types of measures, some never seen before the pandemic, were created and implemented throughout the hotel industry.

The main purpose of this study is to assess guests' perception of preventive safety initiatives and measures in the era of COVID-19 and to determine their level of satisfaction with such measures. …

On-Chip Terahertz Time-Domain Spectroscopy, Randy Sterbentz

UNLV Theses, Dissertations, Professional Papers, and Capstones

Terahertz time-domain spectroscopy (THz-TDS) allows the direct measurement of optical and charge carrier properties of materials in a region of the electromagnetic spectrum inaccessible to most other spectroscopic techniques. We have adapted the technique to an on-chip arrangement that allows us to measure these properties in nanoscale materials with dimensions below the diffraction limit. In this thesis, we present the operation of instruments and the mechanics behind performing on-chip terahertz time-domain spectroscopy. Three materials were tested to confirm the capabilities of our system to measure THz radiation: indium selenide (InSe), radiation-damaged silicon-on-sapphire (RD-SOS), and an erbium arsenide:gallium arsenide superlattice. Preliminary …

Quality Assurance Of Service Learning Back School, Eric Bashaw, Vu Pham, Tyler Parvin, Ryan Pauly

UNLV Theses, Dissertations, Professional Papers, and Capstones

Project Execution: Back School: During the 2019-20 academic year, two University of Nevada, Las Vegas Physical Therapy (UNLVPT) core faculty members, along with eight doctor of physical therapy students, provided three student-led, pro-bono back school classes at Volunteers in Medicine of Southern Nevada (VMSN). Each back school class consisted of two, 2-hour sessions where participants were screened for red flags, educated on pain management strategies and common causes of back pain, and given an individual home exercise program. Quality Assurance Surveys: Patient’s and VMSN staff were all given questions in the form of Likert-scale and open-ended questions via printed handouts …

Recruitment And Advocacy For Clinician Involvement In Pro Bono Physical Therapy Service-Learning Program, Gilberto Carrillo, Gavin Brady, Felicia Doblado, Alyssa Woo Hatch

UNLV Theses, Dissertations, Professional Papers, and Capstones

Background and Purpose: Service-learning allows Doctor of Physical Therapy (DPT) students to develop important professional skills and addresses community-based needs. When integrated into physical therapy education, it can be a powerful tool for increasing students' altruism and social responsibility. Many clinicians desire to participate in pro bono physical therapy (PT) services. Therefore, the responsibility of promoting and advertising these programs falls upon the student. This paper describes various methods for recruiting clinician involvement to improve the sustainability of a student led pro bono clinic, as well as how the students advocated for pro bono services in the state of Nevada …

A Vicious Cycle Of Fear Of Falling Avoidance Behavior In Parkinson’S Disease: A Path Analysis, Kameron Jacobson, Nicole Matsunami, Hannah Mccarl, Michelle Regis

UNLV Theses, Dissertations, Professional Papers, and Capstones

Background: Postural instability (PI) in Parkinson’s disease (PD) is associated with several negative down- stream consequences. Objective: The purpose was to explore the validity of a theoretical model of these downstream consequences arranged in a vicious cycle wherein PI leads to decreased balance con!dence, which in turn leads to increased fear of falling (FOF) avoidance behavior, which in turn leads to decreased physical conditioning, which then feeds back and negatively affects PI. Methods: A path analysis of cross!sectional data from 55 participants with PD was conducted. The four con- structs in the model connected in succession were: 1. PI (principal …

Inter And Intra-Rater Reliability Of Dance Screening Tool, Kathleen Stone, Braden Waters

UNLV Theses, Dissertations, Professional Papers, and Capstones

Previous literature has indicated that injury rates of ballet and modern dancers are among the highest of any physical activity. These injuries can be detrimental to the athlete and can also result in financial burden for dance companies due to time loss related to injuries. Preventative intervention aimed at those who are most at risk for injury can be effective at reducing the cost associated with lost time due to injury. An effective approach to identifying those most at risk for dance related injuries is to administer a functional movement screen. One such movement screen is the ballet-based Dance Technique …

Stepping On Fall Prevention Project, James P. Gaddi, Jordan T. Bowers, Lea M. K. Fung

UNLV Theses, Dissertations, Professional Papers, and Capstones

Background: Falls are a major problem in the United States among the older adult population and provide opportunity for community outreach via student-led physical therapy projects. Objective: The purpose of this project was to investigate the relationship between fall related outcome measures and questionnaires with the completion of the Stepping On Fall Prevention program along with evaluating the benefits of Physical Therapy student development with participation in service learning projects. Methods: The research quantified the fall risk of 13 participants with assessment of: gait speed (Timed Up and Go), lower extremity strength (30-Second Chair Stand), balance (4-Stage Balance Test), and …