Passive Microwave Remote Sensing Of Flash Drought Impacts On Vegetation, Quinton R. Deppert

School of Natural Resources: Dissertations, Theses, and Student Research

In 2002, Dr. Mark Svoboda characterized a new form of drought known as flash drought. Flash drought was defined as a rapid decline in vegetation health caused by severe heat and drought. In recent years, attempts to quantify the impacts of flash drought via precipitation, soil moisture, evapotranspiration, and temperature indicators have proliferated. What has rarely been quantified is what the rapid decline in vegetation health amid flash drought looks like through remote sensing. This is because vegetation health indices like the Normalized Difference Vegetation Index (NDVI) are derived from the visible and infrared regions of the electromagnetic spectrum and …

Application Of Path Analysis To Determine The Impact Of Age And Sex On The Neural Circuits That Promote Nicotine Withdrawal Severity, Veronika Espinoza

Open Access Theses & Dissertations

The rising prevalence of electronic cigarette (e-cigarette) use presents a major public health concern, particularly in adolescent females who are most susceptible to nicotine use and its long-term negative health consequences. The goal of this dissertation was to utilize preclinical rodent models to understand how group differences in age and sex influence neural activation patterns in brain circuits believed to promote nicotine withdrawal. Prior pre-clinical work, conducted largely in male rodents, has established that there are two major brain pathways that modulate the behavioral effects of nicotine withdrawal. These include the mesolimbic and medial habenula-interpeduncular nucleus (MHb-IPN) pathways. To assess …

Salience Network Circuit Dynamics In Distress Tolerance And Drug-Seeking Vulnerability, Marina Alicia Smoak

Open Access Theses & Dissertations

The psychological distress experienced during drug withdrawal can lead individuals with substance use disorder to abandon their goal of abstinence. Numerous human studies demonstrate that an inability to persist in challenging, goal-directed behavior while experiencing psychological distress is associated with multiple stages of substance use, including relapse. This behavioral construct is referred to as low distress tolerance (DT). Rodent models of DT similarly show that low DT predicts elevated cocaine relapse, particularly when DT is assessed following extended abstinence. This abstinence period corresponds with the incubation of craving, a phenomenon characterized by progressively increased cocaine-seeking over time. Importantly, relapse vulnerability …

Decomposition Study Using Pigs In Southeastern Nebraska During The Fall And Winter Seasons, Ryan Bodine

Department of Anthropology: Theses and Student Research

When an individual is found deceased, one of the tools used in the identification process is estimating the post-mortem interval (PMI). This estimate is used to determine how long an individual has been deceased once their remains are found. To estimate an accurate PMI, knowing how decomposition is affected by external factors is key. The transition period from fall to winter in southeastern Nebraska consists of fluctuating temperatures as the seasons transfer from fall to winter. This thesis investigates how decomposition is affected during this transition period while also looking at two different environments that are common in Nebraska, prairies …

Exploring The Biocultural Profile Of The Undocumented Populations Of The Sonoran Corridor: A Skeletal Assessment Of The Prevention Through Deterrence Strategy, Mary A. Vaughn

Department of Anthropology: Theses and Student Research

Over the last thirty years the mortality rate of the undocumented population at the US-Mexico border has risen, requiring methods distinguishing US-born individuals from immigrants to improve the likelihood of identification and repatriation through foreign consulates. Forensic anthropologists with the Pima County Office of the Medical Examiner (PCOME) have advocated for the use of the biocultural profile, combining the biological profile with factors including oral health, osteological stress, and personal effects. The biocultural profile serves two purposes, functioning both as a tool for identification and with which to document structural inequality within communities of origin.

This study examines changes in …

Integrating Incentive Design And Spatial Prioritization For Climate-Smart Forestry Adoption In South Carolina, United States, Miah Maye Pormon

All Dissertations

Forests provide essential ecosystem services, including carbon sequestration, water regulation, timber production, and habitat provision. However, increasing development pressures and land-use changes threaten forest persistence and long-run ecosystem service provision. Climate-smart forestry (CSF) practices, such as improved forest management and extended rotation, offer opportunities to enhance carbon storage, forest resilience, and economic livelihoods. The effectiveness of these practices depends on forest owners’ participation and the strategic allocation of financial resources or incentives. This dissertation develops an integrated framework that combines behavioral economic analysis and mapping to improve the design of current incentive programs. The first chapter employs the Contingent Valuation …

Redeveloping Mississippi: A Case Study On Brownfields In Central & Southern Mississippi, Sahrah R. Yeroozedek

Master's Theses

Brownfields, or properties that are or possibly are contaminated with dangerous materials, represent a common obstacle for communities in Mississippi. The real or potential presence of contaminants at these sites often deters investors due to costly cleanup requirements (EPA, n.d. -b). The Environmental Protection Agency (EPA), through its Brownfield Revitalization Program, implemented guidelines for covering the costs and labor associated with the remediation of these properties. The EPA is not, however, responsible for redevelopment that supports long-term environmental and economic sustainability. Although the EPA maintains inventories of all Brownfields, there is also no comprehensive database of Brownfields and their current …

From Invisible Injury To Measurable Impact: Exploring Associations Between Peripheral Biomarkers Of Neuroinflammation And Mental Health Outcomes After Mtbi, Lauren Leggett Smith

Psychology Theses & Dissertations

Mild traumatic brain injury (mTBI), often referred to as a “silent epidemic,” accounts for the majority of traumatic brain injuries worldwide and is increasingly linked to persistent psychiatric outcomes. Despite its prevalence, mTBI remains understudied due to diagnostic challenges, underreporting, and misperceptions of its clinical significance. The present study examined whether peripheral biomarkers of neuroinflammation and astroglial injury—tumor necrosis factor-alpha (TNF-α), interleukin-6 (IL-6), and glial fibrillary acidic protein (GFAP)— mediate associations between mTBI history and psychiatric symptom severity, including depression, anxiety, and posttraumatic stress disorder (PTSD). Participants were 138 traumaexposed adults recruited from an urban university and surrounding community, with …

Understanding Roma Oppression In Europe Through Humantarian Forensic Analysis, Christal L. Quinn

Department of Anthropology: Theses and Student Research

This thesis examines the marginalization of Roma people in Europe, and how humanitarian forensic practices may help Roma communities in their quest for justice and recognition. The study draws exclusively on secondary information to examine the social, political, and legal issues affecting the Roma communities, who have endured centuries of institutional discrimination, marginalization, and violence. This thesis identifies ways in which systematic oppression continues to limit Roma communities’ access to education, housing, healthcare, and legal protection through a review of relevant literature and applicable theoretical frameworks. The study also examines the relevance of forensic science, particularly its humanitarian applications, in …

Twenty-Four-Hour Intermittent Fasting Extends Lifespan At The Expense Of Fecundity In Daphnia, Meridith L. Smith

Undergraduate Honors Theses

Dietary restriction (DR) is a well-established intervention for extending lifespan, yet the specific efficacy of intermittent fasting (IF) and its associated trade-offs remain under-explored in many Daphnia magna. This study investigated the effects of three IF intervals—2h, 24h, and 48h—on the longevity and fecundity of two clones of Daphnia. We hypothesized that longer fasting intervals would significantly extend lifespan at the cost of reproductive output, consistent with the disposable soma theory of resource allocation.
Our results demonstrate that 24h IF significantly increased longevity relative to ad libitum controls, even outperforming caloric restriction (CR) by reducing late-life mortality. In …

2nd Place Research Paper: Shaping The Ape: Storytelling, Cultural Reflection, And Boundary Negotiation In Human-Ape Zoo Encounters, Abigail Bond Halling

Kevin and Tam Ross Undergraduate Research Prize

The typical Western zoo functions as a unique environment in which animals are frequently positioned as subjects of education and entertainment through the medium of storytelling. In this sense, the zoological institution can also be read as an extension of popular Western constructions surrounding nonhuman animals, particularly those who are symbolically charged characters in our collective imaginary– the great apes. Given the morphological, behavioral, and psychological similarities between humans and other great apes (chimpanzees, gorillas, and orangutans), nonhuman great ape enclosures at the Western zoo become spaces where humans are most radically confronted with navigating the boundaries of the “human-animal …

Distribution Mapping And Modeling Of The Invasive Japanese Knotweed, Jossalyn Rogalski

Masters Theses

This thesis investigates the distribution of invasive Japanese knotweed across Michigan. This plant poses significant challenges to land management due to its rapid growth, environmental impacts, and difficulty of removal once established. Using geographic information systems (GIS), remotely sensed data, and secondary environmental datasets, this research maps current infestations and analyzes key factors influencing the species’ growth and dispersal, such as soil composition, hydrology, land use, and a range of environmental variables, including climatic (annual mean temperature, temperature seasonality, annual precipitation, precipitation seasonality), elevation, vegetation and hydrological indices (NDVI, EVI, NDWI), percent tree cover, and distance to roads. Spatial analysis …

Conventional Vs. Regenerative Apple Orchard Management In Michigan, Anthony Poynter

Masters Theses

This study compares the variables and outcomes of a conventional apple orchard and a regenerative apple orchard production system in Kent County, Michigan. The premise is that conventional agriculture relies on high-input systems characterized by synthetic fertilizers, pesticides, herbicides, and fungicides, while regenerative agriculture focuses on long-term soil health, biodiversity, and ecological processes. These differences are important as soil degradation, nutrient loss, and environmental impacts are becoming too significant to ignore. Most research on alternative ways to farm, such as regenerative practices, is focused on annual crops, while perennial orchard systems, especially in the Great Lakes region, have gained limited …

Psychedelic Research In The Modern Day: Good Or Bad?, Shane Miller

Mechanical Engineering Student Research

This work is about the usage/safety of psychedelic substances, and I explain whether they are good or bad in terms of other drugs, such as alcohol.

Food Insecurity On College Campus, Erika Islao, Izzy Green, Rachel Stone, Ariana Messer

Celebrating Scholarship and Creativity Day (2018-)

Food Insecurity can affect certain groups more than others. At the College of Saint Benedict and Saint John's University we've observed it in international students, student-athletes, and those without transportation. Although CSBSJU offers several dining options, it can still be difficult for students to access meals due to limited availability during breaks, limited dining hours for student-athletes, and transportation barriers. This paper examines how food insecurity and nutrition insecurity impact students’ overall well-being while also exploring how these challenges appear within the CSBSJU community. Research shows that students experiencing food insecurity often report higher stress levels, and lower academic engagement. …

Volume 12 Full Text, Bjur Staff

Butler Journal of Undergraduate Research

No abstract provided.

Exploring Gender As An Analytical Framework In The 2018-2019 Revolution And Ongoing Civil War: The Role Of Gendered Violence And Sudanese Women's Resistance, Ami John

Butler Journal of Undergraduate Research

This paper will interrogate the intersection of gender, war, and political upheaval within Sudan while focusing on the role of women in both the 2019 resistance and the ongoing conflict and revolution. By the end of 2018, mass protests had called for the ousting of Omar al-Bashir, the long-standing Sudanese president. This event set off a chain reaction which led to events that fueled the long-standing rivalry between the two militant groups that were active in Sudan, the Rapid Support Forces (RSF) and the Sudanese Armed Forces (SAF). The tension caused by this rivalry created unforeseen circumstances for the local …

Wallflowers, Misfits, And Gender Nonconformists: Roller Derby As A Refuge, Kate Clement

Butler Journal of Undergraduate Research

This article explores how roller derby serves as a unique space for queer women and gender minorities to foster community and build “found families,” engage in activism, and practice self-expression, from its creation in 1935 to the present. This study will outline the unusual historical context that allowed the sport to evolve radically differently from other professional sports, twentieth-century feminine beauty standards and their role within the era’s roller derby, the inclusive nature of its modern bylaws, and the lived experiences of queer roller derby athletes. Utilizing a wide range of primary sources, including oral history interviews of current roller …

Front Matter And Table Of Contents, Bjur Staff

Butler Journal of Undergraduate Research

No abstract provided.

Soft Systems For Community-Based Hcv Management In Indonesian Oil Palm Plantations, Neny Indriyana, Suyud Warno Utomo, Tri Edhi Budhi Soesilo, Linda Darmajanti

Journal of Environmental Science and Sustainable Development

Certification mandates under the Roundtable on Sustainable Palm Oil (RSPO) and Indonesian Sustainable Palm Oil (ISPO) have made measurable strides in promoting sustainability standards, yet governance challenges in High Conservation Value (HCV) 4, 5, and 6 management remain insufficiently addressed within Indonesian plantation contexts.  Drawing on adaptive governance theory and the social-ecological systems framework, this study argues that such gaps are structurally linked to the marginalisation of community agency within corporate-dominated decision-making. This study proposes and empirically evaluates an integrated governance framework that positions community engagement as a functional contributor to conservation outcomes within plantation landscapes of West Kalimantan, under …

Covid Minds: A Thematic Review Of The Pandemic On Neural Mechanisms And Political Polarization, Madison Jeffries

Honors Projects

This paper analyzes how the COVID-19 pandemic influenced political polarization in the United States by examining the interactions between social system disruption, psychological stress, and underlying neurological behaviors. While previous research has extensively discussed pandemic's influence on public health and societal breakdowns, studies fail to examine how these disruptions shaped political divisions. This study synthesizes interdisciplinary literature on pandemic-induced stressors and analyzes factors, including institutional mistrust and social isolation, and how these experiences shape political behavior and perspectives. Applying research from psychology and neuroscience, the paper argues that prolonged exposure to pandemic-related stressors changed neurological and behavioral patterns in response …

2026 - The Thirtieth Annual Symposium Of Student Scholars

Symposium of Student Scholars Program Books

The full program book from the 30th Annual Symposium of Student Scholars, held on April 22-24, 2026. Includes abstracts from the presentations and posters.

Eeg Studies Of Pre-Stimulus Activity During Turn-Taking In Naturalistic Conversation, Seyedmohamadreza Manzourolajdad

Student Works (2020-2029)

This study integrates conversational analysis principles and neural activity to investigate natural cognition and examine event-related brain changes. A wireless electroencephalography (EEG) device was used in an ecological validity setting to analyse pre-stimulus brain activity preceding conversational turns. This study aims to identify aspects of the conversation that reflect its naturalness in the aspect of listening and the corresponding brain activity by analysing the signals before and after a turn in a conversation. This research contributes to an ecologically valid understanding of natural conversation as a social action that enables seamless communication. Seven Malaysian participants (aged 19–22, M=20.46) engaged in …

A Single Administration Of Psilocybin Is Ineffective In Reversing Ptsd-Like Sequelae In A Rat Model Of Stress-Enhanced Fear Learning, Kylie M. King, Marisa J. Savini, Noelle M. Molnar, Evelynn J. Schneider, Savannah E. Straub, Joe Parker, Lillianna P. Puppel, Aleece K. Al-Olimat, Allison M. Bach, Phillip R. Zoladz

ONU Student Research Colloquium

Single treatments with psychedelics produce rapid, long-lasting antidepressant effects. Psychedelics may also exert anxiolytic effects and be useful in treating more complex psychiatric conditions, such as PTSD. However, less is known about the impact of these agents on PTSD-related symptoms. Thus, we aimed to determine whether a single administration of psilocybin could reverse PTSD-like sequelae induced by stress-enhanced fear learning in rats. Sprague-Dawley rats were placed in Context A (circular, white conditioning box) and exposed to several uncontrollable footshocks (Stress) or no footshocks (No Stress). The next day, the rats were placed in Context B (square conditioning box with clear …

Psilocybin And The Related Tryptamine, Norbaeocystin, Exert Acute Anxiogenic Effects That Depend On Sex, Marisa J. Savini, Kylie M. King, Noelle M. Molnar, Evelynn J. Schneider, Savannah E. Straub, Joe Parker, Lillianna P. Puppel, Aleece K. Al-Olimat, Allison M. Bach, Andrew Jones, Phillip R. Zoladz

ONU Student Research Colloquium

Single treatments with psychedelics have demonstrated rapid, long-lasting antidepressant effects. However, psychedelics often produce unfavorable psychoactive effects that could worsen existing psychological distress. Thus, we compared the effects of psilocybin and the related tryptamine, norbaeocystin, on anxiety-like behavior in male and female rats. In Experiment 1, rats were treated with 1 mg/kg psilocybin (PSIL), 1 mg/kg norbaeocystin (NOR), or vehicle 30 min before a 5-min trial on an elevated plus maze (EPM) or in an open field test (OFT). On the EPM, PSIL led to decreased open arm time and fewer arm entries in males and females. NOR led to …

Impact Of Caffeine On Participant Memory For A Stressful Experience And The Development Of Intrusive Memories, Jaycee L. Kirkland, Kaylina R. Mcclenen, Natalina E. Porter, Sarah M. Wood, Julia Gross, Madilyn E. Paphanchith, Kelsey M. Siereveld, Jasmine Ic Ifeakanwa, Caeden M. Gurganus, Koen N. Suzelis, Aiden J. Farrell, Boyd R. Rorabaugh, Phillip R. Zoladz

ONU Student Research Colloquium

Most individuals consume caffeine on a daily basis. Research has shown that caffeine stimulates the release of glucocorticoids and catecholamines and can enhance cognition. Caffeine also amplifies stress-induced increases in arousal and aggravates PTSD-like symptoms. Thus, we examined the impact of caffeine on memory for a stressful experience and intrusive memories related to that experience. Undergraduate students ingested caffeine or a placebo. Thirty minutes later, they were exposed to the Trier Social Stress Test (TSST; stress condition) or friendly-TSST (f-TSST; control condition), both of which were designed to enable participant memory for the experiences to be quantified. In each condition, …

Program And Proceedings, The Nebraska Academy Of Sciences 1880–2026: 146th Anniversary Year, One Hundred-Thirty-Sixth Annual Meeting

Nebraska Academy of Sciences: Programs and Proceedings

Program and abstracts of the proceedings for the Nebraska Academy of Sciences 136th annual meeting, 2025

Sessions

Aeronautics and Space Science

Anthropology

Biological and Medical Sciences

Earth Sciences

Ecology, Sustainability, and Environmental Science

Physics and Engineering

General Poster Session

2026 Maiben Lecture: Shifting Extremes: Understanding Nebraska’s Changing Climate and Preparing for What Lies Ahead, Deborah Bathke

2026 Friends of Science Awards: Julie Shaffer and Irina Filina

2026 C. Bertrand and Marian Othmer Schultz Colleaguate Schoalrship Award: Piper Ryschon and Bryce Reeson

In Memoriam: Paul Royster

Cultivating Curiosity Across Academic Audiences: Biology And Evidence-Based Science Communication, Nathan D. Forbes

Whittier Scholars Program

Effective Science Communicators must speak to a variety of audiences, with varying quantities of prior interest and qualities of background knowledge. The purpose of this paper was to engage differing audiences in scientific learning. This was done through a hypothetical newsletter made up for four different segments exploring a variety of topics in biology. Each segment intends to speak to a different audience with a different level of interest and/or educational level. Simplifying or analogizing without sacrificing the statistical basis of this project was of paramount importance. In the two segments targeted towards younger audiences, the primary focus was on …

Investigating The Synergistic Effects Of Mental And Physical Exhaustion On Learning And Attention In Emergency First Responders: An Eye-Tracking Study, Kayla Page

Electronic Theses and Dissertations

ABSTRACT

Exhaustion is known to impair cognitive functioning and performance, yet its effects on learning during video-based instruction among first responders and military service members remain underexplored. This study examined how mental, physical, and combined exhaustion independently influence learning outcomes and visual attention in a physically active sample drawn from military, public safety, and emergency service roles. Visual attention was measured utilizing eye tracking, focusing on fixation duration (FD) and fixation rate (FR). Participants completed instructional tasks under each exhaustion condition, allowing comparison of learning and gaze behavior across fatigue states. Results indicated that mental and physical exhaustion were associated …

Analyzing 24-Hour Diet Recalls To Assess Dietary Changes Among Children Who Complete Oral Food Challenges (Ofcs), Hannah Plank, Wan Shen, Heesoon Lee

Honors Projects

Pediatric food allergies are a growing public health concern in America due to their potential association with long-term nutritional impacts and reduced quality of life in those affected. Oral food challenges (OFCs) are considered the gold standard for clinical food allergy diagnosis, but few studies have examined if passing or failing an OFC affects overall diet quality in infants. This clinical observational study examined differences in diet quality, measured by the Healthy Eating Index (HEI), among 39 children aged 0–6 years who participated in OFCs at ProMedica Allergy and Immunology Clinic in Perrysburg, Ohio. Parents and caregivers reported daily dietary …