Digital Commons Network^™

Educational Influences On Environmental Perception: A Semester Analysis Of The New Ecological Paradigm Scale In Undergraduates, Zoe Zingler

Department of Environmental Studies: Undergraduate Student Theses

This study evaluated the impact of a geography course, GEOG 181: Global Environmental Issues, at the University of Nebraska-Lincoln on students’ endorsement of the New Ecological Paradigm (NEP) using a pre-course and post-course NEP scale survey. Analyzing paired responses (n = 40) through t-tests and z-scores, only four of 15 statements had statistically significant shifts observed for the entire sample. However, a targeted analysis of students initially possessing lower endorsement of the NEP—early deniers—revealed significant paradigm shifts post-course. While women initially showed stronger NEP endorsement, men demonstrated notable changes following the course towards endorsement of the NEP. Academic majors, whether …

Development Of A Multi-Use Modular Microfluidic Platform Using 3d Printing, Carson Emeigh

Department of Mechanical and Materials Engineering: Dissertations, Theses, and Student Research

Microfluidic lab-on-a-chip (LoC) technology has driven numerous innovations due to their ability to perform laboratory-scale experiments on a single chip using microchannels. Although LoC technology has been innovative, it still suffers from limitations related to its fabrication and design flexibility. Typical LoC fabrication, with photolithography, is time consuming, expensive, and inflexible. To overcome the limitations of LoC devices, modular microfluidic platforms have been developed where multiple microfluidic modules, each with a specific function or group of functions, can be combined on a single platform. Modular microfluidics have overcome some of the limitations of LoC devices, but currently, their fabrication is …

On-Farm Nitrogen And Irrigation Management Strategies To Protect Groundwater Quality In The Bazile Groundwater Management Area, Arshdeep Singh

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

Increasing groundwater nitrate (NO₃-N) contamination has raised significant environmental and health concerns in the irrigated sandy soils of Nebraska. Four studies were conducted to evaluate the impact the impact of 1) static (NE Yield Goal) vs. dynamic nitrogen (N) recommendations tools (Maize-N, Canopy Reflectance Sensing, Granular, and Adapt-N), 2) three N (optimum, suboptimum, and low) and irrigation rates (farmer’s full irrigation (FIT), 80% FIT, and 60% FIT), 3) conventional N sources vs. enhanced efficiency fertilizers (EEFs), and 4) multiple N splits (2, 3, 4, and 5-N splits) on agronomic (maize yield), environmental (NO3-N leaching), and economic returns (return …

Establishment Of Wildflower Islands To Enhance Roadside Health, Ecological Value, And Aesthetics, Jackson Ebbers

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

Roadsides provide an abundant opportunity to increase connectivity of fragmented landscapes with diminishing floral resources for pollinating insects. The ecological value of these sites is often overlooked as quality habitat for pollinators, particularly monarch butterflies, which have been experiencing severe declines due to loss of habitat and loss of milkweeds that provide food for their larvae. Land managers across the nation are realizing the potential of roadsides to provide high quality floral resources for the benefit of insects and other wildlife. Current wildflower seed mixes used by state transportation departments are often low diversity and may only be implemented following …

Using Annual Forages To Replace Declining Cool-Season Grass Pasture Availability, Jonathon Matthew Jenkins

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

As land area in grain crop production increases in the US Midwest, perennial pasture availability decreases but the demand increases. Matching the seasonal growth patterns of C₃ and C₄ plant species to grow forages that are complementary allows producers to fill production gaps in otherwise monoculture systems and possibly increase overall productivity. One way to fill the forage production gap of C₃ grass dominated pastures is by producing a warm-season, annual forage in a separate field. However, with continual reductions in land availability, this may not be an option. Using two studies, our objectives were to improve …

An Investigation Of Information Structures In Dna, Joel Mohrmann

Department of Electrical and Computer Engineering: Dissertations, Theses, and Student Research

The information-containing nature of the DNA molecule has been long known and observed. One technique for quantifying the relationships existing within the information contained in DNA sequences is an entity from information theory known as the average mutual information (AMI) profile. This investigation sought to use principally the AMI profile along with a few other metrics to explore the structure of the information contained in DNA sequences.

Treating DNA sequences as an information source, several computational methods were employed to model their information structure. Maximum likelihood and maximum a posteriori estimators were used to predict missing bases in DNA sequences. …

Evaluation Of Essential Oils And Their Major Components For Disease Resistance, Serkan Tokgöz

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Essential oils (EOs) are natural hydrophobic compounds, which are highly complex, typically comprising 20 to 60 constituents, with two or three main components making up 20% to 95% of their composition, alongside other minor constituents. Research has firmly established the potent antibacterial and antifungal properties of EOs and their primary components. To assess their efficacy, one EO, nutmeg oil, and seven main components, including safrole, toscanol, safraleine, cinnamaldehyde, carvacrol, carvone, and thymol, were tested against four economically significant fungal pathogens (Alternaria solani, Fusarium graminearum, Rhizoctonia solani, and Sclerotiorum sclerotiorum), one oomycete pathogen (Phytium ultimum …

Ecological Dynamics Of Cenozoic North American Mammals, Alexandria Brandis Shupinski

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Understanding how community structure is affected by various ecological, climatic, and environmental changes is a long-standing goal in ecology. However, disentangling human impacts from these other variables is difficult when using short modern timescales and anthropogenically altered communities. The fossil record provides a means to investigate community structure dynamics across critical intervals, excluding humans as a variable. Here, in three studies, I assess changes in North American mammal paleocommunity structure across the last 66 million years (Ma) at multiple temporal and spatial scales. In Chapter 1, I identify changes in mammal functional diversity (FD) locally and continentally, using three independent …

Investigating Large Repeats In The Arabidopsis Thaliana Mitochondrial Genome Using Mitotalens, Megan Gusso

Honors Program: Senior Projects (Public)

This lab project explores the complexity of the mitochondrial genome by investigating large genomic repeats and their effect on flowering plants’ reproduction and viability. Mitochondria are the site of cellular respiration to create energy and contain their own DNA. This is counterintuitive because the byproducts of cellular respiration impose a threat of mutation for the stored DNA. The mitochondrial genome differs in size between animals and plants. Plant mitochondrial DNA is larger due to the presence of large, noncoding repeated sequences, and a large amount of DNA of unknown function. These sequences undergo high levels of recombination and rearrangement. The …

Drag Reduction In Channel Flow Configurations For Laminar And Turbulent Flow Past Superhydrophobic Surfaces, Henry Louis Ems

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

In this work, we present friction drag reduction in minichannel laminar flow past superhydrophobic metallic surfaces. Femtosecond laser surface processing (FLSP), a one-step scalable method, was used to create permanent microscale and nanoscale structures on 316 stainless steel plates. The resulting superhydrophilic plates were covered by tall (215 μm) or short (27 μm) structures. The FLSP plates were then transitioned to superhydrophobic by evaporative deposition of a fluorinated silane, a low surface energy coating. Using purified water, the friction factor was obtained by measuring pressure drop along a minichannel with a rectangular cross section for flow rates corresponding …

Exploring Subtype C Hiv-1 Tissue Reservoirs And The Impact Of Cannabis Use In Virally Suppressed African Individuals, Zhou Liu

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Antiretroviral therapy (ART) has dramatically prolonged the lives of people living with HIV (PLWH), but it is not curative as it cannot eliminate integrated HIV-1 proviruses in different tissue reservoirs. Even though subtype C HIV-1 accounts for almost half of global HIV-1 infections, few studies had evaluated HIV-1 reservoirs for this subtype. Many co-factors, including the lifestyle factor cannabis use, have been investigated for their potential effects in HIV-1 infection. However, only limited information exists regarding cannabis’s effects on HIV-1 infections in vivo, and the impact of cannabis use on HIV-1 parenchymal tissue reservoirs is unexplored. This dissertation aims to …

Increasing Nursing Aide Knowledge On Benefits Of Light For Sundowning Syndrome, Grace Hilfiker, Julie Masters

Honors Program: Senior Projects (Public)

In this study, the knowledge of nursing aides on the benefits of light for sundowning syndrome was investigated. While dementia and sundowning syndrome is discussed during nursing aide training in the state of Nebraska, there is no discourse focused on how light plays beneficial role in lessening the symptoms of sundowning syndrome for those who are afflicted with dementia. This study asked what the current knowledge base surrounding dementia and sundowning syndrome is of nursing aides in the state of Nebraska. The aim was to justify adding a focus on concrete methods to use when caring for patients with dementia …

Toxicological Effects And Treatment Of Accidental Ingestion Of Simparica Trio® In Felis Catus: An Investigative Review, Aussia M. Stander

Honors Program: Senior Projects (Public)

Simparica TRIO^®, a canine endectocide manufactured by Zoetis, contains sarolaner, moxidectin, and pyrantel pamoate salt in an orally administered chewable tablet. These compounds are all toxic to both cats and dogs in sufficient amounts. As Simparica TRIO^® rises in popularity among pet owners, Felis catus (felines, cats) in multi-pet households (households with both cats and dogs) are at increased risk of overdosage and toxicosis from accidental ingestion of Simparica TRIO^® due to their smaller weight.

Simparica TRIO^® is not for feline use and little literature exists on the symptoms of and treatment for accidental ingestion …

Public Horticulture: Process And Design Of The Lincoln Botanical Garden, Brad Kindler

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

Beginning in 2012, the local non-profit, The Lincoln Botanical Garden, began organizing the conceptual design and creation of a glass conservatory within a botanical garden in Lincoln, Nebraska. These proposed urban enhancements seek to fill a gap in garden amenities in the city by providing year-round access to public horticulture programming and education.

This project, Public Horticulture: Process and Design of the Lincoln Botanical Garden, documents these efforts and makes design recommendations for a themed Glacial Erratic Garden that could be constructed within the botanical garden.

Advisors: Ellen Paparozzi and Sam Wortman

Stories Of Motivation And Values Of Small-Scale Farmers In Jamaica And The United States, Raquel Taylor

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Small-scale farmers add to global and local food systems through various means such as connecting communities to local food and support economies. Small-scale farms can address issues related to food and nutritional security. However, farming can be a challenging career to engage in, especially for those who are small-scale farmers. Matters related to succession, higher paying off-farm employment, policies, and more can make it challenging to engage in farming. Leaving the question of what would motivate someone to engage in small-scale farming. Motivation can be viewed through multiple lenses; this study chose to use self-determination theory to understand the motivations …

Impact Of Plant Defenses And Aphid-Associated Microbes In Modulating Sorghum–Sugarcane Aphid Interactions, Edith Ikuze

Department of Entomology: Dissertations, Theses, and Student Research

Sorghum (Sorghum bicolor) is a vital cereal crop globally, facing challenges from invasive pests such as the sugarcane aphid (SCA; Melanaphis sacchari). To elucidate mechanisms of sorghum resistance to SCA, we examined the role of plant defenses and the influence of aphid-associated microbes in modulating sorghum defenses. Lignin is a complex heterogenous polymer present in nearly all plant cell walls that plays a critical role in protecting plants from various stresses. In this study, we investigated the role of the caffeoyl coenzyme-A O-methyltransferase (CCoAOMT), one of the core enzymes in monolignol biosynthesis pathway that leads to lignin …

Breaking The Rule Of Silence: Childbirth And Gendered Power In Efuru And The Joys Of Motherhood, Sunday Elliott Uguru

Department of English: Dissertations, Theses, and Student Research

This study examines the thematic preoccupation of childbirth in the formative period of feminist discourse in African literature through a critical study of selected novels of Igbo women of southeastern Nigeria. The novels studied represent the earliest published African texts in English by women. The period under focus falls within the emerging stage of Nigerian literary tradition in its written form with a dominant presence of men. This study investigates the women novelists' perspective toward the failure of male authored works to represent women's childbirth experience. Through a critical reading of Flora Nwapa's Efuru and Buchi Emecheta's The Joys of …

A Fish Out Of Water: An Examination Of Self-Identified Introverted Business Students' Perceptions Of Their Leadership Ability, Katie J. Jolicoeur

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Current American cultural and societal ideals favor personalities that are outgoing, positive, and talkative in nature, due to the rise of the Culture of Personality (Wilmot, 2019; Kim, 2012; Cain, 2013). Beginning with the industrial revolution and expanding rapidly midcentury, parents began to view children who are quiet as less favorable than those who are more gregarious, thus children and parents began forced socialization at an earlier age (Wilmot, 2019; Cain, 2013). Very little, if any, research has been conducted to understand the impact that the cultural ideal of favoring extraversion has upon undergraduate students seeking a degree in business, …

Next-Generation Crop Monitoring Technologies: Case Studies About Edge Image Processing For Crop Monitoring And Soil Water Property Modeling Via Above-Ground Sensors, Nipuna Chamara

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Artificial Intelligence (AI) has advanced rapidly in the past two decades. Internet of Things (IoT) technology has advanced rapidly during the last decade. Merging these two technologies has immense potential in several industries, including agriculture.

We have identified several research gaps in utilizing IoT technology in agriculture. One problem was the digital divide between rural, unconnected, or limited connected areas and urban areas for utilizing images for decision-making, which has advanced with the growth of AI. Another area for improvement was the farmers' demotivation to use in-situ soil moisture sensors for irrigation decision-making due to inherited installation difficulties. As Nebraska …

Vibratory Noise Impacts The Sensory Ecology Of A Funnel-Weaving Spider, Brandi June Pessman

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Animals experience their world through diverse sensory systems, leveraging information from prey, predators, and potential mates to inform behavioral decisions. Environmental noise disrupts information via spectral or amplitude masking, degradation, or distortion, potentially leading to costly errors in responses. Critically, urbanization has accelerated the proliferation of novel noise sources, triggering significant shifts in communication, foraging, and predator-prey dynamics among urban wildlife. While vertebrate studies have illuminated urban animals’ flexibility to anthropogenic acoustic noise, a comprehensive understanding requires broader investigations across diverse animal taxa and sensory modalities. To address these gaps, my dissertation explored the impacts of anthropogenic substrate-borne (vibratory) noise …

Healing In The Workplace: School Counselors, Trauma, And Growth, Judith L. Sigler

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

An autoethnographic study on the experience of a Midwest rural school counselor represents a personal and professional perspective on trauma, burnout, and posttraumatic growth. Content includes rural adversity, grief, and career progression. The research aimed to examine professional and private adversities to inform and improve the practice of professional school counselors.

The following research questions were addressed:

1. How did personal and secondary trauma impact a rural school counselor’s professional trajectory?
2. What insight can be offered to other school counselors or educators experiencing the challenges that come with this work and, sometimes, that come from sources that are not from work …

Genome-Scale Metabolic Modeling Of Chitin-Degrading Microbial Systems, Aimee Kristin Kessell

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

As a major component of fungal cell walls and exoskeletons of invertebrates, chitin is widespread in soils, constituting the second most abundant biopolymer in nature. Composed of N-acetyl-D-glucosamine chains, it serves as a vital source of nutrients, including both carbon and nitrogen, for the growth of microorganisms. A solid understanding of the microbial degradation of chitin is critical for predicting their impacts on biogeochemical cycling in soil ecosystems. Organisms that degrade biopolymers (degraders) produce energetically expensive extracellular enzymes to break down complex organic carbons into simpler labile forms that are sharable with other species, including those that do not contribute …

Charge And Strain Engineering Of Ferroic And Correlated Oxides, Yifei Hao

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

This dissertation presents a comprehensive study of the charge and strain effects on the electronic and magnetic properties of epitaxial ferroic and correlated oxide thin films and heterostructures. We perform the planar Hall effect to quantify the magnetocrystalline anisotropy (MCA) in epitaxial La_1-xSr_xMnO₃ films (x = 0.2 and 0.33) deposited on SrTiO₃ substrates. The biaxial magnetic anisotropy energy of L_0.67Sr_0.33MnO₃ is about 17% larger than La_0.8Sr_0.2MnO₃. By comparing with the theoretically predicted values, we have decoupled the doping and strain effects on …

The Relationship Between Sex Education And Women’S Sexual Liberation And Exploration: A Phenomenological Study, Jessica Ann Boyles

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Sex education in schools is a pivotal yet contentious aspect of adolescent development, with enduring impacts on individuals' sexual exploration and liberation. However, the types of sex education offered have varied over time, often disseminating misinformation, and reinforcing traditional gender norms. Particularly for women, sex education can perpetuate harmful stereotypes, limit sexual agency, and contribute to disparities in sexual and reproductive health. This qualitative study aims to address the gap of intersecting sex education and sexual identity by examining the relationship between women's sexual liberation and exploration in adulthood and the sex education they received. Drawing from a phenomenological approach, …

The Sexual Trauma Of The Female Body: Violence Against Women In Contemporary Spanish And Latin American Cultures, Lara Armenteros Garrido

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

This dissertation focuses on the idea that women’s bodies have a sexual stigma attached to them as a consequence of different forms of heteropatriarcal violence inflicted on them. From violence in public spaces, such as street harassment or the sexual exploitation of women, to the intimacy of the relationship, like intimate partner violence or the orgasm gap, it becomes increasingly difficult for women to escape violence. Through the analysis of films, documentaries, narratives, and the testimonies of women from Spain and Latin America, I argue there is still a lack of adequate sexual and emotional knowledge to help complete agency …

Sacrificial Lambs: The Perils Of Childhood In Shakespeare, Benjamin Sidney Reed

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

“Sacrificial Lambs: The Perils of Childhood in Shakespeare” utilizes childhood studies to read five Shakespearean plays and how they portray child characters in perilous situations such as kidnapping, banishment, and murder. It argues these dangers emulate real circumstances young people faced in the early modern period, including the boy actors playing these roles. The dissertation’s key research questions include how children in these plays exhibit agency in the face of danger, how they resist adult systems of power, and how audiences in the sixteenth and seventeenth centuries may have responded to these portrayals of imperiled and rebellious youths. The Introduction …

American Perspectives On The Legitimacy Of Transgender Identities, Sethe Zachman

Department of Sociology: Dissertations, Theses, and Student Research

This mixed-method project examines how Americans’ and Nebraskans’ perceptions of the validity of transgender identities varies by the demographic characteristics of respondents, and how these perceptions are justified. Two representative surveys are used to examine demographic associations with opinion on the cisgender and transgender binary: the 2023 American Values Atlas (AVA) from the Public Religion Research Institute (N=4,788) and the 2022 Nebraska Annual Social Indicators Survey (NASIS) (N=934) from the Bureau of Sociological Research. A measure from the AVA data examines the degree to which respondents believe there are only two genders versus a range of gender identities. The NASIS …

A Compilation, Analysis, And Categorization Of 403 Atmospheric And Climate Science Misconceptions, Haeli Leighty

Department of Earth and Atmospheric Sciences: Dissertations, Theses, and Student Research

The National Association of Geoscience Teachers (NAGT) has listed the inaccessibility of research related to misconceptions in atmospheric and climate science as a Geoscience Education Research Grand Challenge (Cervato et al. 2018). This project was a direct response to this call for research and consisted of three distinct steps: 1) data gathering, which included reviewing the literature for relevant misconception data, 2) a qualitative analysis, which included compiling, organizing, and categorizing the data collected, and 3) a quantitative analysis, which included determining the prevalence of each misconception across topic categories, demographic categories, and over time. A total of 403 misconceptions …

Analyzing Phototaxis And Related Visual Behaviors Among Diverse Species Of Drosophila, Madeline M. Hill

Honors Program: Senior Projects (Public)

Phototaxis and related visual behaviors can vary between species, and thus members of the genus Drosophila make an excellent study system to examine the evolution of vision. While some existing research points to these phototactic behaviors arising due to mating requirements or due to their species-specific ecology or environmental factors, there exists a lack of understanding as to why striking behavioral differences can exist between closely related species, or between members belonging to the same genus. The present research seeks to uncover the specifics regarding these discrepancies in visual evolution and aims to provide a foundation of knowledge about visual …

Sarcopenia And The Importance Of Resistance Training And Protein-Rich Diets For Prevention Of Muscle Loss In Older Adults: A Literature Review And Informational Pamphlet, Madison Steele

Honors Program: Senior Projects (Public)

The growing prevalence of sarcopenia among older adults as well as youths has prompted further research aimed at developing effective preventative measures and treatment plans. Sarcopenia is often thought to occur solely due to aging, but several other factors contribute to progressive muscle loss. Previous research studies have found an effect of physical activity and dietary protein levels on the risk of developing sarcopenia as well as its onset age. This study aims to review existing knowledge in the field to compile an extensive list of sarcopenia causes and methods of prevention. The main causes identified in this review are …