Digital Commons Network^™

Fire, Water, And Biodiversity In The Sierra Nevada: A Possible Triple Win, Scott L. Stephens, Sally Thompson, Gabrielle Boisramé, Brandon M. Collins, Lauren C. Ponisio, Ekaterina Rakhmatulina, Zachary L. Steel, Jens T. Stevens, Jan W. Van Wagtendonk, Kate Wilkin

Faculty Research, Scholarly, and Creative Activity

Reducing the risk of large, severe wildfires while also increasing the security of mountain water supplies and enhancing biodiversity are urgent priorities in western US forests. After a century of fire suppression, Yosemite and Sequoia-Kings Canyon National Parks located in California’s Sierra Nevada initiated programs to manage wildfires and these areas present a rare opportunity to study the effects of restored fire regimes. Forest cover decreased during the managed wildfire period and meadow and shrubland cover increased, especially in Yosemite’s Illilouette Creek basin that experienced a 20% reduction in forest area. These areas now support greater pyrodiversity and consequently greater …

Fabrication And Characterization Of Polyvinylidene Fluoride Nanofibers For Energy Harvesting Applications, Jui Vitthal Kharade

Theses and Dissertations

Miniaturization of portable devices demand a power source that does not require recharging or replacement. Piezoelectric energy harvesters are devices that harvest mechanical energy from environment and convert it into electrical energy thus being an ideal candidate for replacing batteries in small devices. Objective of this thesis is to fabricate an energy harvester with efficient energy conversion. In this thesis, the effect of fabricating mechanisms, solvents, and composites on polyvinylidene nanofibers are analysed in order to improve the piezoelectric response of the nanofibers. These nanofibers are then used for fabricating an energy harvester. The energy harvester is implemented in a …

Production And Characterization Of Polyurethane Fibers By Forcespinning Method And Incorporation Of Luminiscense Nanoparticles, Sunanda Kumar Saha

Theses and Dissertations

In this work, Polyurethane (PU) fine fiber nonwoven mats are generated using the Forcespinning® method. A detailed study focusing on the effect of PU concentration within solutions of N, N Dimethylformamide and the effect of relative humidity (RH) on fiber average diameter and fiber yield is presented. Solutions were prepared with 4 different concentrations, 14, 15, 16 and 17 wt% of PU. It was observed that as concentration of PU increases, average diameter shows a tendency to increase. Production of fibers with RH varying from X to X was analyzed. It was shown that higher RH is convenient for PU …

Uptake Analysis Of As(Iii) And As(V) By Cassia Fistula Seedlings, Valeria Velazquez

Theses and Dissertations

The natural and anthropogenic contamination of water by arsenic has become a major concern to the environment and public health. Phytoremediation is an attractive alternative to ecologically friendly remove contaminants at a potential high efficiency and low cost. Absorption of As(III) and As(V) was evaluated by the measuring the content of arsenic in the roots, leaves and stems Cassia fistula grown under controlled conditions in a hydroponics system. After seeds were germinated, the plants were grown in Hoagland nutrient solution individually supplemented with 1, 2, 5 ppm of As(III) and As(V). After two weeks of exposure, samples of leaves, roots, …

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 …

Minority Adolescents And School Referral: The Importance Of School Counselors And The Referral System, Samantha Jo Davis

Doctoral Dissertations and Projects

The purpose of this qualitative study was to evaluate a school-based referral system in northwest Missouri that is effectively able to identify students with mental health concerns, help students find treatment options, and provide any follow-up needed. The main focus in this qualitative case study was on what makes one school district in northwest Missouri have an effective and successful mental health referral system. The theory guiding this study was Maslow’s hierarchy of needs. This motivational theory is a five-tier model of human needs, including physiological, safety, love and belonging, esteem, and self-actualization. Without having all these needs met, an …

The Influence Of Views Regarding Scriptural Authority On Female Leadership: The Independent Baptist African American Denomination, Cynthia Mczeal

Doctoral Dissertations and Projects

The purpose of the proposed exploratory research study is to examine how different views on scriptural authority regarding female leadership impact women in leadership in the Independent Baptist African American denominational church. The research is necessitated by the extant complementarian-egalitarian debates on scriptural authority regarding female leadership in the selected religious denomination, the high view of scripture amongst evangelicals, and the increasing growth of women’s influence on the evangelical church. There have been little, if any efforts, to understand how various views regarding scriptural authority affect women in leadership in the Independent Baptist African American Denominational Church setting. The main …

Legacy Trail: Photovoice Of African American/Black Women Ces Doctoral Graduates Persistence, Andrea M. Garraway

Doctoral Dissertations and Projects

This qualitative study examined the retrospective experiences of seven African American/Black (AA/Black) women who graduated from a Counselor Education and Supervision (CES) doctoral program, accredited by the Council for Accreditation of Counseling and Related Educational Programs (CACREP). The purpose of the study was to investigate ancestral links to their persistence. This study obtained data from semi-structured individual interviews, a focus group, and PhotoVoice pursuit. Through these different methods of data collection, the validity of the study was increased. The research problem identified was that the CES doctoral degree attrition rate remains stagnated (approximately 50%) and the rate for AA/Black women …

Correlating Maslovian Need Satisfaction To Educational Attainment And Time Since Completion, Anthony Brandt Babbitt

Doctoral Dissertations and Projects

The purpose of this quantitative, correlational research study was to investigate how accurately an individual’s needs satisfaction (i.e., the criterion variables) may be predicted from the combination of educational attainment and time since completion (i.e., the predictor variables). The present study addresses a gap in the literature regarding whether secondary education, post-secondary education, or both, correlate to the satisfaction of Maslow’s hierarchical needs across a broad spectrum sample of the United States population. A US-based quota sample of 245 paid adult participants operating on Prolific Academic’s online research platform provided the data within a Qualtrics-hosted version of the Five Need …

A Content Analysis Of Social Media Posts Among Recreational Cyclists: A Gender Perspective, Eunjung Kim, Kijung Choi, James Lappeman, Jari Salo

Research outputs 2014 to 2021

Recreational cyclists are pertinent but rarely studied leisure and tourism segment. Recreational cycling has traditionally been considered as a ‘masculine stereotyped’ sport. The purpose of the research is to better understand a gendered consumer view of recreational cycling and to possibly promote recreational cycling to women and men in countries like South Africa with keen interests of recreational cycling in the form of sport tourism. This research employs a content analysis of social media posts on Facebook, Instagram and Twitter as a research method. Specifically, the gendered nature of recreational cycling is focused upon. In total, 2,504 posts from 1,598 …

Radiologic Technologists In Saudi Arabia: Does Long-Term Exposure To Radiation Increase The Risk Of Hematological Disorders?, Mohammed Makkawi, Sultan Alasmari, Nasser A. Shubayr, Yazeed I. Alashban, Nashwa H. Eisa, Hussain A. Khairy

Saudi Medical Journal

Objectives: To determine the influence of prolonged exposure to radiation based on dosimeter readings on hematological parameters among radiologic technologists (RTs) in Saudi Arabia. Methods: The study was specifically conducted on selected RTs with experience of more than 10 years and the highest thermoluminescent dosimeter (TLD) readings among all RTs in the Radiological Department, Sabya General Hospital, Ministry of Health, Saudi Arabia from August to October 2020. The RTs group was compared with a control group of non-irradiated participants. Blood samples were collected for hematological and coagulation profile evaluation. Results: The acquired radiation dose analysis revealed that the average accumulated …

Seeding Rate, Nitrogen Fertilzer, And Cutting Timing Effects On Teff Forage Yield And Nutritive Value, Michael C. Laca

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Teff [Eragostis tef (Zucc.) Trotter] is a relatively new forage gaining popularity in the United States; however, information regarding agronomic production practices is lacking. This study was conducted to determine the combination of seeding rate, fertilization, and harvest timing to optimize teff dry-matter yield (DMY) and nutritive value. Four seeding rates (2, 5, 8, and 11 lb/acre), four nitrogen (N) fertilizer rates (0, 25, 50, and 100 lb/acre), and two harvest strategies [boot stage (2-cut) and full seed-head stage (1-cut; stockpiled)] were evaluated in 2010 and 2011 in Kaysville, UT and Yerington, NV. The effects of harvest (1- vs …

Phytochrome Physiology And Plant Perception Of Far-Red Photons, Paul Kusuma

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Photons are the primary energy source for most life on Earth, as they drive photosynthesis, a process that turns the CO₂ in air into food. One crucial parameters for the optimization of growth is leaf area, which determines the ability of a plant to capture photons for photosynthesis. In order to gain access to photons in shaded environments, plants have evolved unique sensors, called photoreceptors, which respond to changes in the color and intensity of light.

Far-red photons (photons at the edge of human vision that appear as dim red light) hold particular promise in regulating plant shape and …

An Agenda For Research And Action Toward Diverse And Just Futures For Life On Earth, Carina Wyborn, J. Montana, N. Kalas, S. Clement, F. Davila, N. Knowles, E. Louder, M. Balan, J. Chambers, L. Christel, T. Forsyth, G. Henderson, S. Izquierdo Tort, Michelle Mei Ling Lim, Et Al

Research Collection Yong Pung How School Of Law

Decades of research and policy interventions on biodiversity have insufficiently addressed the dual issues of biodiversity degradation and social justice. New approaches are therefore needed. We devised a research and action agenda that calls for a collective task of revisiting biodiversity toward the goal of sustaining diverse and just futures for life on Earth. Revisiting biodiversity involves critically reflecting on past and present research, policy, and practice concerning biodiversity to inspire creative thinking about the future. The agenda was developed through a 2-year dialogue process that involved close to 300 experts from diverse disciplines and locations. This process was informed …

Empowering Learners Through Habits Of Mind And Personalized Pathways: An Ethnographic Study, Megan Amundson

Dissertations, Theses, and Projects

While teaching using a personalized learning concept, it was discovered that learners did not have the necessary social emotional skills that they needed in order to successfully make decisions for their learning. Throughout researching personalized learning, engagement, self-pacing, and empowered learning three different Habits of Mind, the school district’s social emotional learning program, were identified to teach to a small group of learners in grades three through six to help them better understand what personalized learning is and why they are doing it in order to take ownership of their learning. Therefore this research question was created: How does the …

A Whole New (Eastern) World: Ramy Youssef’S Role In The Undoing Of Orientalism In Modern-Day Media, Mary Hanna

Theses, Dissertations and Culminating Projects

In 2019, writer and director Ramy Youssef debuted his semi-autobiographical television series, Ramy. Youssef’s series is a coming-of-age story that documents the typical trials and tribulations of entering adulthood all while navigating these issues as a young Muslim Egyptian American. The creation of the show in part serves to address common Orientalist misconceptions regarding religion, customs, and gender roles that exist in mainstream media, especially in a post 9/11 world. Youssef’s intention is to derail the trajectory of this discourse by offering an often overlooked first-hand portrayal of a diasporic Arab and Muslim experience in America that defies the predominant …

The Effects Of Ketamine Administration On Novel Object Placement And Hippocampal Ampa Receptor Expression In The Male Long Evan Rats, Ruchael Mcnair

Theses, Dissertations and Culminating Projects

Many psychiatric and neurological disorders such as major depressive disorder (MDD) and mild cognitive impairment (MCI) present with deficits across many cognitive domains including spatial memory and structural dysfunction of the hippocampus. The dorsal hippocampus is indicated to play a special role in spatial memory. Synaptic plasticity mechanisms are also critical in memory function in the hippocampus. Long-term potentiation (LTP) is one type of synaptic plasticity that is directly associated with memory function. Mechanisms of LTP increase α-amino-3-hydroxy-5-methyl-4- isoxazolepropionic acid (AMPA) receptors through n-methyl-d-aspartate (NMDA) receptor activation. Ketamine is an NMDA antagonist that has recently gained attention for its rapid …

Cyclic Sulfones From Double Conjugate Addition Of Rongalite, Hao Zong

Theses, Dissertations and Culminating Projects

We report a cyclic sulfone synthesis method from the addition of sodium hydroxymethanesulfinate to doubly electrophilic dienone substrates. The novel synthesis of the cyclic sulfone thus avoided the using the toxic and odorous sulfides, and also oxidizing reagents. We prepared both the symmetrical and unsymmetrical substrates, and then used the substrate for the synthesis of cyclic sulfone.

Interpersonal Needs And Suicide Risk: Examining Indirect Effects Of Internal Hostility And Feeling Forgiven, Kelley C. Berto

Electronic Theses and Dissertations

Suicide is a national public health concern, and unmet interpersonal needs (i.e., perceived burdensomeness, thwarted belongingness) may contribute to enhanced risk. However, mechanisms of action and certain protective variables are not well understood. The present study examined simple mediation models, with internal hostility as a mechanism of action between interpersonal needs and suicide risk. Additionally, our study examined the moderating role of various aspects of receiving forgiveness on the association between interpersonal needs and internal hostility in these simple mediation models. A community-based convenience sample was surveyed (N=712). Our findings indicated that internal hostility partially mediated the association …

The Influence Of Incubation Conditions On Oxygen Consumption During The Development Of Pantherophis Guttatus, Celeste Gallardo

Electronic Theses and Dissertations

The flexible shell of some oviparous reptiles has led to differences in nutrient mobilization and water relations when compared to their rigid-shelled counterparts. Flexible-shelled eggs gain more water during development, and because of the shell structure, yolk calcium content is higher than that of eggshells. When water availability is altered for reptiles with flexible-shelled eggs, differences in both energy and nutrient utilization are observed. This study was designed to determine the baseline metabolic rate during development for the snake, Pantherophis guttatus under normal conditions, and to observe how changes in eggshell calcium and water availability impact embryonic oxygen consumption. Eggshell …

Peaking For Maximal Strength: Muscular Adaptations And Performance Outcomes, Spencer K. Travis

Electronic Theses and Dissertations

The purposes of this dissertation were to 1) determine what tapering and peaking practices appear to be most effective via systematic review, 2) to identify the tapering and peaking practices used by North American powerlifters, 3) to experimentally compare muscular adaptations and performance changes following two different training cessation periods, and 4) to experimentally compare the two most common taper models following a training program aimed at peaking maximal strength. Based on the scientific literature, a step and exponential taper appeared to be the most effective tapering models used when volume-load is reduced by half over 2±1 week. Interestingly, North …

Endothelial Heat Shock Protein A12b And Yes-Associated Protein Cooperatively Promote Angiogenesis Following Myocardial Infarction, Min Fan

Electronic Theses and Dissertations

Heart failure after myocardial infarction (MI) remains the leading cause of mortality among all cardiovascular diseases globally. Angiogenesis plays a critical role in cardiac functional recovery after MI. Heat shock protein A12B (HSPA12B) is predominately expressed in endothelial cells and required for angiogenesis. Yes-associated protein (YAP) has been reported to promote tumor angiogenesis.

In the present study, we investigated the cooperative role of HSPA12B and YAP in angiogenesis following myocardial ischemic injury. Endothelial specific deficiency of HSPA12B (eHspa12b^-/-) or YAP (eYap^-/-) impairs angiogenesis and exacerbates cardiac dysfunction after MI, when compared with wild type …

Gabaergic-Related Pathology In The Anterior Cingulate Cortex Of Postmortem Human Brain Tissue In Autism Spectrum Disorder, Gethien Andrew

Electronic Theses and Dissertations

The anterior cingulate cortex (ACC) is part of the cognitive and emotional brain circuitry that mediates social interaction. Imbalances between inhibitory, GABAergic neurons, and excitatory, glutamatergic neurons, in this region are essential to brain circuity during social responses and are thought to be involved with behaviors associated with autism spectrum disorder (ASD). Enriched cell populations of glutamatergic neurons, obtained through laser capture microdissection, were used for gene expression studies of GABAergic receptors (GABRA1, GABRA4, and GABBR1). Additionally, proteins that impact GABAergic synapses (Spinophilin, CPLX1, mTOR, IGF1R, PSD95, PARP1) were investigated using Western Blotting with punchdissected homogenate brain tissue from ACC …

Synthesis, Self-Assembly, And Material Applications Of Unimolecular Polyviologens, Abigail Delawder

Arts & Sciences Graduate Student Theses and Dissertations

Intellectual Gaps: Synthesis of high molecular weight, unimolecular, and sequence-defined polyviologens; spatiotemporal control over mechanical properties of materials using visible and near-IR light; on-demand, post hoc manipulation of materialsIntellectual Merit: Robust method for synthesizing higher-order polyviologens of distinct molecular weight; control the change in the mechanical properties of polymer-based, crosslinked materials using a wide range of wavelengths of light; degradation of viologen-crosslinked hydrogels To understand fundamentally how viologens behave within a polymer chain, we needed a better and more efficient way of synthesizing these long chains of polyviologens. As simple as this process looks on paper, the synthesis is tedious …

Mitophagy Protein Pink1 Suppresses Colon Tumor Growth By Metabolic Reprogramming Via P53 Activation And Reducing Acetyl-Coa Production, Kunlun Yin, Jordan Lee, Zhaoli Liu, Hyeoncheol Kim, David R Martin, Dandan Wu, Meilian Liu, Xiang Xue

Pathology Research and Scholarship

Colorectal cancer (CRC) is the third leading cause of cancer-related deaths in the US. Understanding the mechanisms of CRC progression is essential to improve treatment. Mitochondria is the powerhouse for healthy cells. However, in tumor cells, less energy is produced by the mitochondria and metabolic reprogramming is an early hallmark of cancer. The metabolic differences between normal and cancer cells are being interrogated to uncover new therapeutic approaches. Mitochondria targeting PTEN-induced kinase 1 (PINK1) is a key regulator of mitophagy, the selective elimination of damaged mitochondria by autophagy. Defective mitophagy is increasingly associated with various diseases including CRC. However, a …

Emotional Labour In The Lifeworld Of Indian Hospitality Employees: A Phenomenological Inquiry, Sanjay Bhattacharya, Hirak Dasgupta

The Qualitative Report

In this study we explore the lived experience of emotional labour of ten hospitality employees and tries to get a deeper understanding of how they interpret it in their life world. In-depth interviews were conducted with the front-line employees 4,5-star hotels and high-end restaurants in the city of Pune in Western Indian state of Maharashtra. Using Interpretative Phenomenological Analysis (IPA) to analyse the data, the findings threw up some convergent as well as divergent themes about how the employees interpret the experience in their life world and how they feel about it. Emotional maneuverability, ambivalent disposition, spillover of emotions emerged …

How Do You Visit: Identifying Addicts From Large-Scale Transit Records Via Scenario Deep Embedding, Canghong Jin, Dongkai Chen, Zhiwei Lin, Zemin Liu, Minghui Wu

Research Collection School Of Computing and Information Systems

Identification of individuals based on transit modes is of great importance in user tracking systems. However, identifying users in real-life studies is not trivial owing to the following challenges: 1) activity data containing both temporal and spatial context are high-order and sparse; 2) traditional two-step classifiers depend on trajectory patterns as input features, which limits accuracy especially in the case of scattered and diverse data; 3) in some cases, there are few positive instances and they are difficult to detect. Therefore, approaches involving statistics-based or trajectory-based features do not work effectively. Deep learning methods also suffer from the problem of …

Node-Wise Localization Of Graph Neural Networks, Zemin Liu, Yuan Fang, Chenghao Liu, Steven C.H. Hoi

Research Collection School Of Computing and Information Systems

Graph neural networks (GNNs) emerge as a powerful family of representation learning models on graphs. To derive node representations, they utilize a global model that recursively aggregates information from the neighboring nodes. However, different nodes reside at different parts of the graph in different local contexts, making their distributions vary across the graph. Ideally, how a node receives its neighborhood information should be a function of its local context, to diverge from the global GNN model shared by all nodes. To utilize node locality without overfitting, we propose a node-wise localization of GNNs by accounting for both global and local …

Lessons Learned In Abruptly Switching From In-Person To Remote Data Collection In Light Of The Covid-19 Pandemic, Crystal M. Walker, Loretta Alexia Williams, Trimika Bowdre

The Qualitative Report

In light of the COVID-19 pandemic, a research study that utilized in-person focus groups to collect qualitative data was abruptly shifted to videoconference focus groups to minimize risk to subjects. Protocol amendments consisted of using an online scheduling tool to arrange focus groups by Zoom, providing electronic versions of consent forms and demographic surveys, and highlighting security features of the videoconference software. Lessons were learned from making an abrupt switch from in-person to remote focus groups. Making this type of shift is not simply a matter of switching for researcher convenience but includes determining the appropriateness of an abrupt switch …

Research Output Analysis Of The Highest Productive Department Of Mizoram University: A Study Based On Scopus Database, Nayana Borah, S. N. Singh

Library Philosophy and Practice (e-journal)

In this study, an attempt has been made to analyze the research productivity of the highest productive department of the Mizoram University indexed in SCOPUS database. Since it is the only central university in the state of Mizoram and scientometric profile of the highest productive department of Mizoram University is not analyzed until now. Agricultural and Biological Sciences has the highest number of publications i.e., 303 indexed in SCOPUS database. The study revealed that highest number of publications is on 2020; highest number of documents are published as research article; Hazarika, T. K. is the most productive author with 36 …