Digital Commons Network^™

The Evolutionary And Morphological Diversification Of The Subtribe Papionina, Sophie B. Labelle

Master's Theses

Analysis of variation is critical in understanding evolutionary processes. The subtribe Papionina, defined commonly as baboons and their closest relatives, is a highly morphologically diverse group of primates that is useful for the examination of the relationship between variation and evolution. The subtribe is also a valuable behavioral, ecological, and morphological analogy for hominins. This study uses landmark-based cranial geometric morphometric data and multivariate analysis to test whether the pattern of morphological diversification present in Papionina is consistent with genetic drift and/or selection. The study sample consists of six extant genera of Papionin, represented by ~500 individuals collected by Michelle …

A Role For Notch Signaling In Drosophila Spermatogenesis, Adrianna Soriano

Master's Theses

The Notch signaling pathway has diverse functions in male and female gonad development. In Drosophila male embryos, Notch specifies hub cell fate in somatic gonadal precursor cells (SGPs), which are important for maintaining germline stem cells and somatic cyst stem cells throughout the lifetime of adult flies. However, a role for Notch signaling in adult males has only started to emerge recently. Nonetheless, we still don’t understand how the Notch pathway functions to regulate spermatogenesis. Notch has been established to be important for the fertility of multiple systems, including mammals, and must be properly regulated for proper spermatogenesis, but the …

Anthropogenic Litter In Illinois Streams: Monitoring, Distribution, And Relationship To Biological Indicators Of Stream Health, Lauren Wisbrock

Master's Theses

Anthropogenic litter (i.e., trash; AL) is increasing in aquatic ecosystems worldwide. AL shows a patchy, uneven distribution in lotic ecosystems due to heterogeneity in its sources, how it moves, and mechanisms of retention. In addition, the diversity of material types, size, and mobility makes developing techniques to measure AL assemblage in rivers a challenge. In rivers, watershed land-use and riparian features likely impact AL abundance and composition, but this impact is not fully understood. Measuring AL can be time consuming and labor intensive, so rapid assessments are needed for ecosystem managers to quantify the level of AL impairment in a …

Temperature Effects On Prevalence Of Sexually Transmitted Infections Among At-Risk Female Sex Workers In India, Rajshri Suresh

Master's Theses

Vulnerability to climate change varies depending on the baseline climate, sensitivity to given exposure, and the presence of social, political, cultural, and institutional inequalities that influence access to essential resources of livelihood, particularly among informal labor market participants. Within the risky informal labor market, the transient nature of sex work implies that sex workers suffer disproportional losses in health, income, protection, and other aspects of general well-being as a result of the effects of climate anomalies. In this paper, I investigate the effect of temperature on the prevalence of sexually transmitted infections in a high-risk population of female sex workers …

Detecting Feeding And Estimating The Energetic Costs Of Diving In California Sea Lions (Zalophus Californianus) Using 3-Axis Accelerometers, Mason Russell Cole

Master's Theses

Knowledge of when animals feed and the energetic costs of foraging is key to understanding their foraging ecology and energetic trade-offs. Despite this importance, our ability to collect these data in marine mammals remains limited. In this thesis, I address knowledge gaps in both feeding detection and fine-scale diving energetic costs in a model species, the California sea lion (Zalophus californianus). I first developed and tested an analysis method to accurately detect prey capture using 3-axis accelerometers mounted on the head and back of two trained sea lions. An acceleration signal pattern isolated from a ‘training’ subset of synced video …

Deep Reinforcement Learning Based Path-Planning For Multi-Agent Systems In Advection-Diffusion Field Reconstruction Tasks, Deepak Talwar

Master's Theses

Many environmental processes can be represented mathematically using spatial-temporal varying partial-differential equations. Timely estimation and prediction of processes such as wildfires is critical for disaster management response, but is difficult to accomplish without the availability of a dense network of stationary sensors. In this work, we propose a deep reinforcement learning-based real-time path-planning algorithm for mobile sensor networks traveling in a formation through a spatial-temporal varying advection-diffusion field for the task of field reconstruction. A deep Q-network (DQN) agent is trained on simulated advection-diffusion fields to direct the mobile sensor network to travel along information-rich trajectories. The field measurements made …

Influence Of Night Work On Performance During Lunar Telerobotic Operations, Zachary Luke Glaros

Master's Theses

Real-time, reactive telerobotic mission control operations require personnel to actively operate remotely controlled vehicles or robots in real time. Due to the physical separation of the vehicle from the operator, such operations present additional factors that can influence fatigue (degraded mental performance) and workload (mental and physical cost of task requirements), making it difficult to assess how long an individual can conduct operations safely. The upcoming Volatiles Investigating Polar Exploration Rover will involve remotely controlling a lunar vehicle from an Earth-based mission control station. In order to determine how long personnel could successfully maintain alertness and performance while operating a …

Identifying Key Residues Involved In Allosteric Regulation Of Human Sirt1 Deacetylation Activity, Angelina Huynh

Master's Theses

SIRT1 is a mammalian NAD+-dependent lysine deacetylase involved in the regulation of physiological processes. Sirtuin-activating compounds (STACs) such as resveratrol bind to the allosteric site within the N-terminal domain (NTD) to regulate activity. Understanding these allosteric effects on SIRT1 would provide insights into drug design to modulate SIRT1-dependent deacetylation on specific substrates. The overall goal of this research is to identify key residues that are involved in allosteric activation of the enzyme, also known as an allosteric switch-like region. Using computational methods based on the primary sequence of SIRT1, we identified residues 186-193 to have a propensity to exhibit switch-like …

A Meta-Analysis Of Fmri Studies On Emotion Processing In Major Depressive Disorder, Madison Morocco

Master's Theses

The processing of an emotional stimulus involves a multi-step process that includes appraising and identifying a stimulus as well as producing an affective state in response. Many individuals with depressive disorders such as major depressive disorder (MDD) experience impairments related to emotion processing, likely caused by changes in the structure and function of brain regions important for emotion processing. However, the precise neural differences underlying emotion processing impairments in MDD remain unclear given conflicting findings in the neuroimaging literature. This lack of clarity has hindered the development of novel neurostimulation treatments for MDD, which require targeting of specific brain areas. …

A Silicon Valley Life: A Silicon Valley Love Story, Sharon Simonson

Master's Theses

In the last three decades, Silicon Valley has become one of the world’s most watched and imitated communities. Daily news reporters, long-form journalists, cinema and television-programming producers have crafted a public image, but it represents nothing of the lives of hundreds of thousands of Valley residents. These fabrications obscure and diminish our complex human profile and reduce our uniquely beautiful geography to a place to generate financial profits, with all the damaging disregard such attitudes foster. The essays of A Silicon Valley Life: A Silicon Valley Love Story seek to show our true self: our rich mix of people drawn …

Effects Of Infection Of The Protist Parasite, Dermomycoides Sp., In Dusky Gopher Frog Tadpoles, Jaime Smith

Master's Theses

Infections of the protist parasite, Dermomycoides sp. are thought to have caused several years of low recruitment in the dusky gopher frog (Rana sevosa) populations. I evaluated the effects of density of the infective zoospores, host developmental stage, and tadpoles' ability to acquire resistance to Dermomycoides sp. on dusky gopher frog tadpoles. Tadpoles were exposed to zoospore densities of 0, 250, 500, and 750 zoospores/µL at Gosner stage 25, and we found no significant differences among treatments in tadpole mortality. In evaluating susceptibility by development stage, I exposed R. sevosa to 50 zoospores/µL as eggs, embryos, hatchlings, and …

Assessment Of Genetic Diversity In Largetooth Sawfish, Pristis Pristis, Populations Over The 20th Century, Ann Fearing

Master's Theses

The Critically Endangered Largetooth Sawfish, Pristis pristis, experienced global declines in range and abundance over the past century and Australia is now their last stronghold. This research aimed to understand whether these declines have been accompanied by a reduction in levels of genetic diversity. Using P. pristis tissue samples sourced from natural history specimens, three fragments (616-bp, 386-bp, 141-bp) in the mitochondrial DNA (mtDNA) control region were PCR-amplified. At each fragment, significant genetic structure was found in P. pristis overall (Φ_ST=0.946, N=9; 0.813, N=54; 0.771, N=99). The Indo-West Pacific and Atlantic/Eastern Pacific each harbor genetically distinct lineages of …

Development And Use Of An Environmental Dna Tool To Monitor Recovery Of The Critically Endangered Smalltooth Sawfish, Pristis Pectinata, In The Northwest Atlantic, Ryan N. Lehman

Master's Theses

The Critically Endangered Smalltooth Sawfish, Pristis pectinata, was once common in the tropical and subtropical waters of the Atlantic Ocean; however, following global declines in range and abundance over the past century, individuals were restricted to the waters of south and southwest Florida (SWFL) by about the 1980’s. Recently, public encounter reports have emerged in historically occupied habitats in United States waters, suggesting individuals are present in, or re-occupying, these areas, although the status of P. pectinata outside of SWFL is not currently well understood. Targeted environmental DNA (eDNA) surveys were chosen to assess the occurrence of P …

Nutrition At Tipu: A Comparative Analysis Of Juvenile Health In Maya Populations, Sydnie A. Bianchi

Master's Theses

The site of Tipu in west central Belize provided a foothold for Spanish missionaries in the 17^th century. The effects of contact on adults among the 550 burials recovered in the cemetery there have been well studied, but the children have received less attention. Therefore, this study examined juvenile health through four markers: Linear Enamel Hypoplasia (LEH), a non-specific marker of health disruptions; Porotic Hyperostosis (PH), an indicator of anemia; and Periostitis, an indicator of infection. Some 131 individuals were evaluated using criteria developed by Steckel, Sciulli, and Rose (2002). The results were compared to Late Classic Copán (Storey, …

Study Of Plants Used Against Infections By California Native American Tribes, Maria J. Rojas

Master's Theses

The objectives of this research were to evaluate the antibacterial activity and to determine the chemical composition of a list of medicinal plants used by Native Americans in California. Artemisia californica, Mimulus aurantiacus, Equisetum telmateia, Equisetum hyemale, and Marah fabacea were selected from a list of plants reported as having been used for ailments related to infections by tribes located in California. The extracts obtained through steam distillation from E. telmateia, E. hyemale and M. fabacea were assayed for in vitro antibacterial activity against 16 Gram-negative and 6 Gram-positive bacteria using disk diffusion assays and measuring the diameters of inhibition …

Missing In Action: Locating The Body In Interdisciplinary Studies, Ann Lenore Moradian

Master's Theses

This research project relied on the use of interdisciplinary literature, surveys and interviews to explore the prevalence of the human body and its movement across a variety of disciplines other than movement-based practices, and also to explore perspectives of movement experts regarding the knowledge, skills, and capacities they believed might be related to their practice-based work. In other words, what do movement practitioners and movement experts know, and who cares? The materials gathered were analyzed with the aim of understanding the range of possibilities for future work, and identifying areas of potential discourse, engagement, or collaboration across disciplines. The outcomes …

Synthesis And Evaluation Of N-(9'-Acridinyl)-O-Phenylhydroxylamines, Jana Forster

Master's Theses

Anilinoacridines are a class of compounds that are known to intercalate DNA. This class of compounds can be used as a target therapy to combat cell growth and replication. The anilinoacridines, DNA, and topoisomerase II will form a ternary complex that results in numerous strand scissions leading to apoptosis. Previous research has shown that the anilinoacridines can have a short half-life and produce harmful side products as a result of hydrolysis. The half-life could increase if this structure was slightly altered by making a molecule that does not readily hydrolyze. N-(9’-Acridinyl)-O-phenylhydroxylamines can be synthesized in three steps starting with commercially …

Fostering Resilience: Integrating Positive Character Strengths With Dance Making Skills To Help Young Children Cope With Adversity, Laura Vormwald

Master's Theses

The purpose of this study was to investigate how involvement in a choreography unit focused on positive character strengths could increase confidence in strengths that foster resilience. Research shows that building resilience is the key to helping children overcome adversity and trauma. Both qualitative and quantitative methods were used to answer the three research questions in this study. Q1 Does involvement in dance making build students’ character strengths? Q2 Which character strengths are best developed through dance making? Q3 Which inspirations for dance making relate most thoroughly to the selected character strengths? The research instruments used were a pre and …

Investigating The Timing Of Initial Louann Salt Flow And Its Relationship With The Gilbertown Fault Zone, Southwest Alabama, Avery Rosenbalm

Master's Theses

The Mesozoic Louann Salt extends through the northern GOM, extending onshore from eastern Texas to western Alabama and Florida. Along the landward terminus of the salt is a system of peripheral faults, including the Gilbertown Fault Zone bordering the Mississippi Interior Salt Basin to the north and east. This study sought to constrain the timing of fault movement and determine its relationship to the baswinward evacuation of Louann Salt through the use of a 3D seismic survey and well logs. By mapping Mesozoic formations and the peripheral fault system, lateral changes in formation thickness were used to generate fault expansion …

Hate Speech, Habitus, And Identity Signaling On 4chan’S Politically Incorrect Board, Jonathon Geiger

Master's Theses

Websites, such as 4chan, have provided a place for extremism and hate speech to flourish through anonymous discourse. One group that has been especially important to this growth has been the alt-right. The alt-right is a far-right white nationalist movement that is known for engaging in trolling, creating memes, and generating conspiracy theories. Past research has focused on the amounts of hate speech and characterizing content on the website. However, past studies have not looked at the experience of using the website through the combination of participant observation and content analysis. Here I show that the extensive use of hate …

Assessing The Recalibration Interval For Nearshore Sediment Assemblages After Hurricane Irma: Implications For Developing Long-Term Records Of Overwash Deposits, Stephen Mitchell

Master's Theses

Surface distributions are commonly collected to assist with overwash interpretation; however, many of these are first established immediately after a major overwash event as part of a post-event field survey. This study documents the impacts of Hurricane Irma, a Category 5 storm, on nearshore sediments off the coast of Anegada (British Virgin Islands) using distributions of Homotrema rubra, an encrusting foraminifer with a defined provenance in coral reef ecosystems. Over four sampling intervals spanning 2 years, from six months pre-Hurricane Irma to 18 months post-Hurricane Irma, surface sediment was collected from three shore-perpendicular transects on both the northern and …

Contribution Of Submarine Groundwater Discharge To Select Biogeochemical Fluxes In St. Louis Bay, Mississippi, Haley Spaid

Master's Theses

This thesis assesses the role of submarine groundwater discharge (SGD) in St. Louis Bay, Mississippi. Located along the northern Gulf of Mexico, St. Louis Bay (SLB) is a semi-enclosed bay that is important to the local area for recreation and tourism. SGD is the movement of any water into the water column across the sediment-water interface. In coastal environments, SGD can be a source of a variety of substances including nutrients and pollutants. In this study, a steady state mass balance approach was used to quantify SGD flux for SLB using ²²³Ra, ²²⁴Ra, and Ba. Using the water …

Microplastic Abundance, Distribution And Impacts On Sargassum-Associated Juvenile Fishes In The Gulf Of Mexico, Olivia Lestrade

Master's Theses

Microplastics are a concern in marine environments because they are highly durable, ubiquitous, and can be mistaken for food and ingested by small organisms. Pelagic Sargassum, an important habitat for larval and juvenile stages of many fish species, is found in large surface aggregations, and may provide complex structure in which microplastics become trapped. This could lead to greater risk of microplastic ingestion by fish early life stages associated with Sargassum habitats. To better understand the impacts of microplastics within Sargassum communities, this study examined 1) microplastic concentrations and ingestion by juvenile fishes associated with Sargassum; 2) the microbial …

Assessing The Nursery-Role Function Of Pelagic Sargassum For Juvenile Fishes In The Northern Gulf Of Mexico, Courtney Stachowiak

Master's Theses

Sargassum, a genus of holopelagic brown algae, floats at the ocean’s surface using air-filled bladders and forms a complex comprised of two species, S. natans and S. fluitans. Oceanic processes (e.g., Langmuir circulation, etc.) aggregate Sargassum into mats and weedlines, and primarily distribute the algal complex throughout the North Atlantic Ocean and the Gulf of Mexico (GOM). These floating habitats provide shelter and feeding opportunities for a diverse community of invertebrates and fishes. Sargassum is a presumed nursery habitat for juvenile stages of commercially- and recreationally-targeted fishery species. In this study, I estimated the standardized abundances of juvenile …

Determining The Trophic Role Of Red Snapper (Lutjanus Campechanus) In Mississippi State Waters Using Stomach Content And Stable Isotope Analysis, Branden Kohler

Master's Theses

The goal of this study was to determine the diet composition, trophic position and ecological role of red snapper (Lutjanus campechanus) in Mississippi state waters utilizing stable isotopes (δ¹³C and δ¹⁵N) and stomach content analysis. Stable isotope analysis of fish and their prey can provide information on species-specific basal resource utilization, diet composition and trophic position which can improve food web models and inform fisheries management decisions. Particulate organic matter (POM), the presumed base of the food web, red snapper muscle tissue, and red snapper stomach contents were collected from 25 sites in 2016 and …

Physiological And Anatomical Responses Of Douglas-Fir And Lodgepole Pine To Bark Beetle Attack And Blue-Stain Fungi Inoculations, Robert Walker

Master's Theses

Bark beetles are important native insect pests to conifer forests in North America and their irruptive beetle populations are of serious concern both ecologically and economically. As bark beetles bore into the phloem of a host tree to excavate brood galleries, they simultaneously deposit spores of blue-stain fungi. Both the partial girdling of the tree’s phloem by beetles and the blockage of xylem by fungi can overcome the tree’s defenses and cause its death. To combat colonization by insects and pathogens, conifers allocate large amounts of metabolic resources into defense mechanisms, of which, resin ducts play important roles. As resin …

Dignity And Respect In The Salsa Dance Classroom: Fostering Healthy Self-Esteem To Promote Compassion, Diana Sanchez

Master's Theses

Many students that have attempted to take salsa dance classes often express their disillusionment in the way in which they are treated by salsa dance instructors. Salsa dance classes have the possibility to function to awaken in the student greater integration with the society in which people live, while stimulating actions, improving self-esteem, and self-confidence, improving vocabulary, awakening sensitivity, attenuating shyness, as well as increasing communicative and social skills. If the content of a course is well designed and delivered with an intentional student-centered approach, it can positively contribute to greater and more sincere learning. In this sense, the objective …

Strictly Ballroom: Examining How The Culture Of Collegiate Ballroom Dance Influences Body Image Perceptions, Rachel Neil

Master's Theses

The purpose of this study was to examine the influence that collegiate ballroom dance programs have on participants’ body image perception and self-esteem and to identify what sort of effect those perceptions have on performance satisfaction. In this project the researcher surveyed twenty-four students, ten males and fourteen females, who were presently involved in a collegiate ballroom dance program with a goal of identifying what sort of influence the culture of their ballroom dance programs had on each participant’s body image and self-esteem. The research instrument used in this study was an electronic survey that included yes or no questions, …

Desire And The Power Of Practice: Queer Sexual Perspectives, Philip W. Kemp

Master's Theses

This research provides a theoretical analysis of the lived experiences of 17 queer individuals, ages 19 to 66, regarding their sexual desires and practices. Queer Theory is incorporated to inform on sex, gender performance and sexuality as social constructs, to inform grounded theoretical concepts, and to identify expressed social behavior by each participant. Social Exchange Theory is used to analyze participant responses. Modified grounded theory is incorporated to posit a particular social exchange that I refer to as the queer exchange; in which particular costs/benefits are considered before queer individuals engage in social exchanges due to their potentially (un)perceived queerness. …

Analysis Of Electroanatomic Mapping System Accuracy Using X-Ray Reconstruction Of Electrode Locations In A Porcine Animal Model, Hana Boudlali

Master's Theses

Fluoroscopy is considered the gold standard for locating catheters during cardiac electrophysiology (EP) procedures. However, fluoroscopy emits ionizing radiation which can lead to adverse health effects when exposed to in high doses (World Health Organization, 2016). Electroanatomic mapping (EAM) systems display the three-dimensional location of EP catheters and measure the local electrical activity of the heart. They can minimize a physician’s reliance on fluoroscopy and can help reduce radiation exposure during a case (Casella, 2011).

EAM systems are diagnostic medical devices that inform the placement of ablation therapy and must accurately locate catheters to be deemed safe. Test methods to …