Digital Commons Network^™

Isolation And Characterization Of Bacteriophages From Fish Tank Samples, Oluwaseyi Oluwagbeminiyi Oladele-Ajose

Electronic Theses and Dissertations

Bacteriophages (phages) are viral obligate intracellular parasites that infect bacteria. Research has been carried out on alternative treatment plans for bacterial infections due to the increase in antibiotic resistance. Phages have been proposed as an alternative to antibiotics. This research focused on the isolation and characterization of bacteria from small aquariums. A total of 42 bacterial isolates were isolated from seven different fish tank water samples and were tested to determine if they possessed phages. Spot plaque assay revealed presence of lytic phage for only one of the isolated bacterial strains, which was determined to belong to Enterobacteriaceae family based …

Comparative Lineament And Geomorphic Analysis Of Chaotic Terrains And Noctis Labyrinthus, Mars, Sarah A. Walton

Electronic Theses and Dissertations

Noctis Labyrinthus (NL) is an extensional trough network connecting the Tharsis rise and Valles Marineris on Mars. Chaotic terrains are a group of polygonally-fractured surface features commonly associated with subsidence due to rapid fluid loss within the subsurface. Polygonal surface patterns are seen at both sites, where geometric topographic highs are bounded by low troughs. Lineaments, topography, and geomorphology of NL and chaotic terrains were analyzed to determine tectonics and fluid influence in the formation and evolution of both sites. NL shows preferential fracture patterns associated with regional extension. Lineaments within chaotic terrains do not show cumulative preferential trends but …

Quantifying Current Soil Brine Contamination Within The Smackover Oil Field In Arkansas Using Multispectral Digital Imagery, Victoria Williams

Electronic Theses and Dissertations

A remote sensing study was performed to quantify current soil brine contamination across the historic Smackover Oil Field in south-central Arkansas, United States. The oil field was established in 1922 and was not subject to the future waste regulations created by the Arkansas Oil and Gas Commission. Brine is a waste product of oil manufacturing which contains water with high salt levels. The storage and transport of brine in the oil field created landscape scarring across the study area.

Landsat 9 multispectral digital imagery was utilized to create supervised classification maps based on earthen pits and creek scarring across the …

A History Of Complex Simple Lie Algebras, Avrila Frazier

Electronic Theses and Dissertations

In 1869, prompted by his work in differential equations, Sophus Lie wondered about categorizing what he called “closed systems of commutative transformations,” while around the same time, Wilhelm Killing’s work on non-Euclidean geometry encountered related topics. As mathematicians recognized this as a division of abstract algebra, the area became known as “continuous transformation groups," but we now refer to them as Lie groups.

Patterns and structures emerged from their work, such as describing Lie groups in connection with their associated Lie algebras, which can be categorized in many important ways. In this paper, we focus on Lie algebras over the …

The Politics Of Preservation: Stewarding Artifacts In Archives, Kollynn Hendry

Electronic Theses and Dissertations

Kay Bailey Hutchison served Texas and the United States in many capacities during her political career. She vastly impacted Texas, as well as Nacogdoches, Texas in particular, through her time serving as a member of the Texas House of Representatives and as a United States Senator. In 2012, she donated her massive collection of gifts and memorabilia to the East Texas Research Center, a regional archive at Stephen F. Austin State University. The university honored her donation by creating a room to display the collection and interpret her influence on East Texas. Due to a rushed timeline, administrative interference, and …

The Effects Of Transcranial Direct Current Stimulation (Tdcs) On Facial Expression Approach/Avoidance In College Students And Faculty With Broad Autism Phenotype, Nicole R. Baker

Electronic Theses and Dissertations

Transcranial Direct Current Stimulation (tDCS) has been proposed as an alternative noninvasive therapy for individuals with autism. This study trained brain activity in college students and / or faculty with Broad Autism Phenotype (BAP) while eye tracking data was collected. The purpose of this study was to determine if tDCS training to the frontal lobes could increase approach toward social interactions in adults classified as BAP as demonstrated by eye-tracking measures in response to faces and gaze fixation. The study included 21 total participants recruited from the Science, Technology, Engineering, and Math (STEM) courses / professions at a Regional East …

The Behavior Assessment System For Children Third Edition (Basc-3)’S Classification Accuracy For Attention-Deficit/Hyperactivity Disorder (Adhd) In Young Adults, Angela Lafaye Lucas

Electronic Theses and Dissertations

Attention-Deficit/Hyperactivity Disorder (ADHD) was established as a condition initially considered to be outgrown; however, research later demonstrated that about one-half to two-thirds of children with ADHD had persistent symptoms into adolescence and adulthood (Resnick, 2005). It was estimated that the percentage of college-aged students with ADHD ranged somewhere between 2 and 8% (DuPaul et al., 2009). Assessing for an ADHD diagnosis determination in college student-aged individuals was a challenge that required strategies not typically used when assessing for other disorders or within different age ranges (Lovett & Davis, 2017). There was a lack of consistent strategies amongst clinicians on how …

Quantification Of Influential Surface Fuel Parameters In Fire-Prone Ecosystems Of The Netherlands, Lauren Lara

Electronic Theses and Dissertations

Changing climate conditions in northwest Europe present an increasing wildfire risk in the Netherlands. Focus on fuels monitoring in this region is not as extensive as it is in the United States. Accurate estimation of biomass fuel loading is integral to prevention of wildfires which pose a significant risk to both human lives and property. This research project attempted to create predictive models for three major fuel categories (litter/duff, shrub, and downed woody material). Reduction of the number of parameters to measure would streamline the process of fuel load estimation by reducing the number of measurements that need to be …

Molecular Detection And Characterization Of Rickettsia Sp. In Hard Ticks Collected In Nacogdoches, Texas, Haley Nicole Standifird

Electronic Theses and Dissertations

The number of cases of tick-borne diseases is increasing in the United States. Many efforts to control ticks have been made and are continuously being developed. These methods include surveillance of ticks and detection of the tick-borne pathogens.This study examined hard ticks in Nacogdoches, Texas, to test for the presence of Rickettsia sp. 47 ticks were collected from vegetation by flagging and their species, sex, and developmental stage were determined using available keys. Individual ticks were processed for nucleic acid extraction and molecular detection of Rickettsia sp. using PCR-based methods. The citrate cynthease gene, 17kDa gene, and outer membrane protein …

Effectiveness Of 2016 Watershed Protection Plan On Bacteria And Nutrient Concentration Loads In The Attoyac Bayou Watershed, Jack Henson

Electronic Theses and Dissertations

In 2004, bacteria and nutrient sampling on the Attoyac Bayou Watershed discovered elevated concentrations of E. coli on five of the main channels key tributary streams. The Attoyac Bayou was then listed on the Texas 303d list of impaired waterbodies and further research was conducted to identify the main sources of contamination in the waterbody. In 2016, the Attoyac Bayou Watershed Plan (WPP) was developed to implement best management practices (BMPs) that would decrease bacteria and nutrient concentrations in the watershed. Educational outreach programs, on-site-sewage facility repair, and livestock management were some of the strategies suggested by the protection plan …

Maladjustment Among Victims Of Bullying, Jack Bryant

Electronic Theses and Dissertations

Bullying has garnered attention from educators, social scientists, and the public at large for nearly 50 years, but the dilemma persists. We have seen that bullying is a high-risk factor for psychological adjustment across the lifespan. The current study has surveyed college students to ascertain their perceptions of adjustment in adult life. The study has added to the existing literature in addressing the role of reduced perceived control in the maladjustment of bully victims. A novel contribution was made by comparing the strength of this potential mediator to another documented correlate of poor adjustment among bullying victims, thwarted belonging.

Reservoir Characterization Of The Utica Shale Play Using Well Log Data In Columbiana, Ohio, Tyler L. West

Electronic Theses and Dissertations

The Ordovician Utica shale play is rapidly developing throughout the Appalachian Basin. The play is a mixed carbonate-siliciclastic system that grades from primarily carbonates at its base in the Lexington/Trenton limestones into primarily shale within the Utica shale. As of January 2021, it is the third highest-producing dry shale gas play in the contiguous U.S., although it is known to produce wet gas and oil in various parts of the basin. In addition to being an unconventional reservoir, the Utica shale, an informal unit in Ohio where the main fairway is located, is a known source rock for much of …

An Analysis Of All-Cause Mortality On Patients With Sickle Cell Disease And Kidney Disease Using Propensity Score Matching, Adam Garrison

Electronic Theses and Dissertations

In this work, we provide an overview of the Cox proportional hazards model for time to event or survival analysis and the notion of propensity score matching to deal with confounding factors. A full analysis is reported in Chapter 2 concerning mortality for in-center dialysis patients with sickle cell disease to demonstrate the application of a general analysis strategy that has some logistical benefits over more traditional approaches to accounting for confounding variables. We also provide some insight and discussions on the challenges and future research questions that will emerge when trying to implement this strategy as a monitoring tool …

Blockchain Security: Double-Spending Attack And Prevention, William Henry Scott Iii

Electronic Theses and Dissertations

This thesis shows that distributed consensus systems based on proof of work are vulnerable to hashrate-based double-spending attacks due to abuse of majority rule. Through building a private fork of Litecoin and executing a double-spending attack this thesis examines the mechanics and principles behind the attack. This thesis also conducts a survey of preventative measures used to deter double-spending attacks, concluding that a decentralized peer-to-peer network using proof of work is best protected by the addition of an observer system whether internal or external.

Restrictions On Topological Symmetry Groups Of The 3-Rung Möbius Ladder On The Torus, Logan Willhoite

Electronic Theses and Dissertations

In this work, we discuss properties of the 3-rung Möbius ladder embedded on the surface of a torus. We present proofs on restrictions of topological symmetry groups of the Möbius ladder with and without the assumption of preserving orientation. Specifically, we show that Z₂ is the only possible non-trivial orientation-preserving topological symmetry groups, and also that Z₂ and D₂ are the only possible nontrivial topological symmetry groups.

Characterization Of Molecular Content, Cytotoxicity, And Anti-Inflammatory Activity Of Extractions From Eupatorium Serotinum, Jordy Sloan

Electronic Theses and Dissertations

Inflammation is a complex and varied immune response which can be expressed chronically or as a temporary reaction to foreign invaders. Symptoms of inflammation include swelling, pain, soreness, and difficulty of motion. Recently, the effect of sesquiterpene lactones such as Helenalin from Arnica montana have been studied for their anti-inflammatory properties. In this study, we identified and harvested samples of Eupatorium serotinum, a plant historically used by Native Americans to treat a variety of medical illnesses. Crude extracts of the leaves, flowers, roots, and stems were prepared by ethanol extraction. The cytotoxicity of the different extracts on HEK293 cells …

Perception Of Alumni Of The Department Of Agriculture At Stephen F. Austin State University, Sherifat Rufai

Electronic Theses and Dissertations

University alumni surveys have served various purposes since they were introduced in the 1930s in the United States. The Department of Agriculture at Stephen F. Austin State University (SFASU) aimed to evaluate alumni perceptions between the Fall of 2010 and the Spring of 2022 to provide an opportunity to examine the relationship between degree fields and occupations and the agriculture curriculum, salaries, and demographic data for college graduates. This study's web-based survey was designed to include closed-ended and open-ended questions to collect individual opinions using Qualtrics Survey Software. The survey materials were made available on the alumni's social media accounts. …

The Future Is Now In Twisted Coil Polymer Actuators (Tcpa), Ryan Ronquillo

Electronic Theses and Dissertations

This thesis aimed to fabricate and test twisted coiled polymer actuators (TCPA) to understand the mechanical and thermal aspects of this artificial muscle fiber. The purpose of this thesis was to find a linear relationship using the LVDT sensor, fabricating TCPA fibers, and interpreting the data. The project tested whether nylon/polymer could be used as a better artificial muscle fiber.

This research accomplished three goals: (1) designing and fabricating a system capable of creating supercoiled muscle fibers consistently, (2) calibrating the Linear Variable Differential Transformer (LVDT) and Core, and (3) analyzing/interpreting the data of the Twisted Coiled Polymer Actuators (TCPA) …

The Impact Of Couple Minority Stress And Perceived Relationship Equity On Relationship Satisfaction Of Women In Same-Gender Relationships, Rebekah Malott

Electronic Theses and Dissertations

The purpose of this study was to test two hypotheses (H1: relationship satisfaction will mediate the relationship between perceived relationship equity and potential relationship dissolution in women in same-gender relationships. H2: Relationship satisfaction will mediate the relationship between perceived minority stressors and potential relationship dissolution in women in same-gender relationships). Participants who met the demographic profile and consented to the study were asked to complete five questionnaires: relationship equity (Kurdek, 1998), couple minority stress (Neilands et al., 2019), relationship satisfaction (Funk & Rogge, 2007), potential relationship dissolution, and demographics. The results showed that relationships satisfaction was a partial mediator between …

Dolphin Behavioral Responses To Uncrewed Aerial Systems As A Function Of Exposure, Height, And Type, Savannah Damiano

Electronic Theses and Dissertations

Uncrewed aerial systems (UAS) are becoming a standard tool in the study of cetaceans, however, a comparative assessment of animal responses to UAS has not been established to gauge the most effective systems for cetacean study. We utilized Dolphin Quest Bermuda’s eleven bottlenose dolphins as subjects for such an investigation taking place over five weeks in 2022 and five weeks in 2023. The dolphins were evaluated for investigative behavioral responses to six off-the-shelf UAS types and a custom fixed wing system. Each UAS was flown in decreasing height vertically above the main dolphin lagoon to evaluate dolphin behavioral responses in …

Peer Perceptions Of Parent-Students Seeking Higher Education, Alexandria Wall

Electronic Theses and Dissertations

With a growing number of parents pursuing academia, it is imperative that researchers understand the social environment in which parent-students function. Stereotypes of parent-students may be held by peers, faculty, and other educational supervisors. Across two previous independent studies, evidence and rationale were provided to suggest that both positive and negative perceptions of parent-students exist, with noted differences between gender. The purpose of the current 2x2x2 between-subjects study was to analyze the social perceptions of students enrolled in higher education as varied by parenthood status, age, and gender. The social perceptions included measures accounting for perceptions of intelligence and academic …

Identifying And Analyzing Multi-Star Systems Among Tess Planetary Candidates Using Gaia, Katie E. Bailey

Electronic Theses and Dissertations

Exoplanets represent a young, rapidly advancing subfield of astrophysics where much is still unknown. It is therefore important to analyze trends among their parameters to learn more about these systems. More complexity is added to these systems with the presence of additional stellar companions. To study these complex systems, one can employ programming languages such as Python to parse databases such as those constructed by TESS and Gaia to bridge the gap between exoplanets and stellar companions. Data can then be analyzed for trends in these multi-star exoplanet systems and in juxtaposition to their single-star counterparts. This research was able …

A Score Of Voices: Creating And Scoring An Original Film With A Cappella Choir, Zachary James Moore

Electronic Theses and Dissertations

Film scores typically feature large instrumental ensembles, sometimes with choir added at pivotal moments. Rarely, however, is the choir entrusted with a greater percentage of the score, and far too scores explore the sonic potential that vocal music has to offer. In fact, in a recent study of 800 films, none contained a score that was completely c. Thus, the body of unaccompanied choral film scores is practically non-existent. This curious gap in repertoire inspired me to create the documentary Downstream (2023) and score it entirely with an unaccompanied choir. The full score to this new work is contained within …

Early Instruments In 21st Century Composition And An Original Composition For Saxophones And Viols, Jacob Bitinas

Electronic Theses and Dissertations

Composers continually seek new timbres and sonorities to bend to their will. The early music revival of the twentieth century has resurrected dozens of instruments that have gone unutilized in contemporary composition for centuries. The historically-informed-performance movement has now evolved to a point where early instruments and period performance techniques can add extraordinary new characters to twenty-first century compositions. This thesis explores how composers effectively utilize early instruments like the viola da gamba, harpsichord, lute, and recorder in their compositions.

The document also contains interview transcripts from eight composers and performers, including Nico Muhly, Liam Byrne, Martha Bishop, David Loeb, …

The Rise Of Wavetable Synthesis In Commercial Music And Its Creative Applications, Garrett Norman Scroggs

Electronic Theses and Dissertations

Wavetable synthesis is a powerful tool for music creation that helps composers and producers develop their own unique sounds. Though wavetable synthesis has been utilized in music since the early 1980s, advancements in computer technologies in the 2000s and the subsequent releases of software synthesizers in the late 2000s and early 2010s has led to the increased presence of wavetable synthesis in commercial music. This thesis chronicles a historical overview of the use of wavetable synthesis in commercial music and demonstrates the accessibility and power that wavetable synthesis delivers in music creation. The demonstration portion of this thesis features two …

Peer Perceptions Of Parent-Students Seeking Higher Education, Alexandria M. Wall

Electronic Theses and Dissertations

With a growing number of parents pursuing academia, it is imperative that researchers understand the social environment in which parent-students function. Stereotypes of parent-students may be held by peers, faculty, and other educational supervisors. Across two previous independent studies, evidence and rationale were provided to suggest that both positive and negative perceptions of parent-students exist, with noted differences between gender. The purpose of the current 2x2x2 between-subjects study was to analyze the social perceptions of students enrolled in higher education as varied by parenthood status, age, and gender. The social perceptions included measures accounting for perceptions of intelligence and academic …

The Effects Of Variations Of Victim Impact Statements On Juror Bias, Emily Sutton

Electronic Theses and Dissertations

Victim impact statements (VIS) are federally protected statements describing the physical, emotional, and financial impact of a crime on a victim. States can decide the content and timing of the VIS, resulting in much variation. Previous research has found an effect of these variations on mock juror bias in capital trials. The current study examined if variations such as changing the strength of emotion, crime type, and including sentencing recommendation within a VIS affects the judgements of mock jurors. The results showed the sexual assault VIS produced higher guilt ratings and longer sentences. Furthermore, the inclusion of a high sentencing …

Distribution And Soil Characteristics Associated With The Neches River Rose-Mallow (Hibiscus Dasycalyx), Morgan E. Langlinais

Electronic Theses and Dissertations

The Neches River rose-mallow, Hibiscus dasycalyx, is a rare herbaceous perennial endemic to East Texas. The threatened, obligate wetland species is currently at risk of being lost in the wild due to habitat loss, encroachment of nonnative and native plant species, and hybridization with two other Hibiscus congeners, Hibiscus laevis and Hibiscus moscheutos. Known locations of each of the three Hibiscus species were used to measure select soil characteristics and habitat variables associated with each of the rose-mallows. H. dasycalyx was concluded to be associated with more fertile soils and slightly more canopy coverage than H. laevis and …

Differentiate Metasploit Framework Attacks From Others, Gina Liu Ajero

Electronic Theses and Dissertations

Metasploit Framework is a very popular collection of penetration testing tools. From auxiliaries such as network scanners and mappers to exploits and payloads, Metasploit Framework offers a plethera of apparatuses to implement all the stages of a penetration test. There are two versions: both a free open-source community version and a commercial professional version called Metasploit Pro. The free version, Metasploit Framework, is heavily used by cyber crimininals to carry out illegal activities to gain unauthorized access to targets.

In this paper, I conduct experiments in a virtual environment to discover whether attacks originated from Metasploit Framework are marked with …

Sequencing And Functional Characterization Of A Latrodectus Geometricus Defensin, Lg-Defensin, Jacklyn Victoria Thompson

Electronic Theses and Dissertations

Defensins are small, cysteine-rich, immune related proteins described to be the most widespread family of invertebrate antimicrobial peptides. Presently, there is limited information regarding spider defensins. In this study, a new defensin peptide was described in Latrodectus geometricus, Lg-defensin. The full open reading frame was resolved using RACE and de novo assembly, followed by a bioinformatical analysis and phylogenetic alignment to determine conserved sequence patterns and structural similarities to other defensins. Next, the functionality of Lg-defensin was determined using in vitro RNA interference to assess what impact silencing had on the spider’s ability to control a gram-positive and gram-negative bacterial …