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2021

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Applications Of Longitudinal Machine Learning Methods In Multi-Study Alzheimer's Disease Datasets, Charles F. Murchison Jan 2021

Applications Of Longitudinal Machine Learning Methods In Multi-Study Alzheimer's Disease Datasets, Charles F. Murchison

All ETDs from UAB

Advances in statistical learning models for prediction have led to broader application across a variety of disciplines, granting generalizations and adaptations that were previ-ously intractable even with advanced computational techniques. Among these is the al-lowance of correlated data with inherent paneled structure such as longitudinal or clus-tered data; adjustments which have already begun to be applied to a variety of supervised and unsupervised machine learning methods which had previously focused on cross-sec-tional data. These modifications have seen rudimentary testing in a number of applied disciplines where correlated data is commonly observed, including medical and clinical research. One field in particular …

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Neonatal Murine Cytomegalovirus Infection Disrupts Synapse Remodeling During Development, Jerome Moulden Jan 2021

Neonatal Murine Cytomegalovirus Infection Disrupts Synapse Remodeling During Development, Jerome Moulden

All ETDs from UAB

Human cytomegalovirus (HCMV) is a complex double stranded DNA betaherpesvirus. Its linear DNA in enclosed in an icosahedral capsid, and has a genome size of about 230kb and encodes about 170 genes. Primary infection with HCMV lead to a lifelong persistent infection. HCMV can also be transmitted across the placenta and infect the developing fetus leading to infection of the newborn infant, an infection which is commonly described as congenital HCMV infection. In the United States, the prevalence of congenital HCMV infection is between 0.2-1.2%. Approximately 5-15% of these newborn infants will develop long-term neurological damage resulting, motor disorder, cognition …

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Multidrug-Resistance, Antibiotic-Associated Acute Kidney Injury, And Poor Disease Prognosis In Community-Acquired Bacterial Pneumonia, Adeniyi J. Idigo Jan 2021

Multidrug-Resistance, Antibiotic-Associated Acute Kidney Injury, And Poor Disease Prognosis In Community-Acquired Bacterial Pneumonia, Adeniyi J. Idigo

All ETDs from UAB

In this dissertation research, I examined the challenges of treating patients with bacterial community-acquired pneumonia (CAP) with the purpose of identifying risk factors linked with multidrug-resistant (MDR) Pseudomonas, treatment toxicity, and poor disease prognosis. I used a retrospective cohort study design to explore a clinical cohort of patients admitted to the University of Alabama at Birmingham hospital network who had bacterial pneumonia diagnosis assessed to be from community transmission between January 2013-December 2019. Electronic medical records were accessed for socio-demographic and clinical information. First, I examined the local prevalence/incidence of Pseudomonas CAP and MDR Pseudomonas CAP, and the relationship between …

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Studies On Nontypeable Haemophilus Influenzae Biofilm Persistence & Redox Homeostasis In Chronic Bacterial Diseases, Benjamin C. Hunt Jan 2021

Studies On Nontypeable Haemophilus Influenzae Biofilm Persistence & Redox Homeostasis In Chronic Bacterial Diseases, Benjamin C. Hunt

All ETDs from UAB

Bacterial biofilms, or surface-adherent bacterial communities surrounded by a self-produced extracellular polymeric matrix, are ubiquitous. They are found throughout Earth’s ecosystems, in the soil and waterways, and more pressingly for the medical community, they are found within humans. Bacterial biofilms are associated with a multitude of diseases and their involvement significantly complicates treatment given that bacteria growing within a biofilm are extremely more resistant to antibiotics and immune effectors. Thus, the need to better understand biofilm biology and find ways to disrupt and/or sensitize biofilms to medical treatment is significant. The goal of the research presented herein was to investigate …

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Shades Of Black: Black Collegiate Women And The Impact Of Colorism In Higher Education, Charletta Nickole Wiggins Jan 2021

Shades Of Black: Black Collegiate Women And The Impact Of Colorism In Higher Education, Charletta Nickole Wiggins

All ETDs from UAB

Colorism perpetuates the same variables that drive the principles of racism and has led to disparate treatment, lower self-esteem, and negative perceptions within communities of color for decades. Since Black women are considered second class citizens, behind both men and White women, it is vital to acknowledge that their experiences with racism, compounded by colorism, are most salient. The purpose of this qualitative research study is three-fold: (1) to explore colorism as a phenomenon while also investigating its impact on the higher education attainment of Black collegiate women, (2) to give these women a voice regarding their personal experiences with …

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Low Illumination Video Enhancement Based On Machine Learning, Mohsine Taarji Jan 2021

Low Illumination Video Enhancement Based On Machine Learning, Mohsine Taarji

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ow-brightness and image noise are common problems in computer vision that prohibit useful information extraction from video sequences. This problem is caused by insufficient illumination, low-quality cameras, external disturbances, and other factors. Dark image enhancement requires improvement of intensity and saturation; the missing data could be replaced by matching image regions using image feature detector-descriptor pairs. We proposed new metrics for evaluating image descriptors with regard to their uniqueness. Also, we developed new image enhancement techniques based on HSV color space. The idea behind the first contribution of our dissertation is to find the best descriptor that match pixels from …

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Functions Of Drosophila Hp1 Proteins In Transcriptional Regulation, John Schoelz Jan 2021

Functions Of Drosophila Hp1 Proteins In Transcriptional Regulation, John Schoelz

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The Heterochromatin Protein 1 (HP1) family are a group of non-histone chromosomal proteins with functions in many essential DNA processes. The HP1 family is highly conserved, and many eukaryotic genomes contain multiple HP1 genes. Individual paralogs specialize in specific functions, although they do have overlapping roles in some processes. In Drosophila, there are three HP1 paralogs expressed in somatic cells: HP1a, HP1B and HP1C. All three of these proteins have previously been implicated in both the positive and negative regulation of transcription. Furthermore, the three proteins share binding sites and colocalize broadly throughout the Drosophila genome. Here, we investigate individual …

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Effeccts Of Hiv-1 Tat On Tspo, A Biomarker Of Neuroinflammation, Nguyen Thuy Nhu Nguyen Jan 2021

Effeccts Of Hiv-1 Tat On Tspo, A Biomarker Of Neuroinflammation, Nguyen Thuy Nhu Nguyen

All ETDs from UAB

HIV-associated neurocognitive disorders (HAND) produces serious neurological dysfunction for > 50% of people living with HIV (PLWH). As antiretroviral therapy (ART) has transformed HIV into a chronic disease, and since most ART does not effectively cross the blood brain barrier, HAND is predicted to further increase in prevalence in PLWH. The HIV-Trans-Activator of Transcription (Tat) is known to persist in the central nervous system (CNS) of chronically infected HIV+ individuals. In several preclinical studies, HIV-Tat has been shown to be neurotoxic and important for HIV pathogenesis. Translocator protein (TSPO), an 18 kDa mitochondrial protein, has been shown to be increased via …

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Characterization Of Rna Polymerase I Trigger Loop Mutations, Collin Ainslie Jan 2021

Characterization Of Rna Polymerase I Trigger Loop Mutations, Collin Ainslie

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RNA polymerases are primarily multi-subunit enzymes that synthesize RNAs from template DNA strands. RNA polymerase I (Pol I) is the eukaryotic RNA polymerase that synthesizes the majority of ribosomal RNA (rRNA) for ribosome production. These include the 5.8S, 28S, and 18S rRNAs which are synthesized from a polycistronic gene in the nucleolus. The rRNAs synthesized by Pol I, the 5S rRNA, & ribosomal proteins come together to synthesize ribosomes through ribosome biogenesis. Dysregulation of Pol I activity has been established to contribute to dysregulation of ribosome biogenesis and disease state development. These conditions include but are not limited to Cincinnati …

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Characterization Of Cellular And Viral Factors That Define The Stability Of The Latent Hiv-1 Reservoir, Eric Carlin Jan 2021

Characterization Of Cellular And Viral Factors That Define The Stability Of The Latent Hiv-1 Reservoir, Eric Carlin

All ETDs from UAB

Human immunodeficiency virus (HIV) infection is a chronic viral illness that requires lifelong management due to the early formation of a latent viral reservoir within the patient’s CD4+ T cells. These latent infection events lay dormant within infected cells and reactivate stochastically or during periods of T cell activation presenting a major hurdle to the development of an HIV cure. As our understanding of the factors that contribute to HIV latency has evolved, we have started to appreciate latency as more than a chromatin regulation phenotype, due to the vast number of cellular factors that have been described to impact …

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Tgfβ Provides The Backbone Of Embryogenesis: Elucidating The Role Of Tgfβ Signaling And Its Downstream Effectors On Spinal Column Development, Sade Williams Clayton Jan 2021

Tgfβ Provides The Backbone Of Embryogenesis: Elucidating The Role Of Tgfβ Signaling And Its Downstream Effectors On Spinal Column Development, Sade Williams Clayton

All ETDs from UAB

The spinal column is composed of two components, the vertebra (VB) that provide support and the intervertebral disc (IVD) that provide weight distribution. The structural integrity of IVDs is maintained by a fibrocartilaginous tissue called the annulus fibrosus (AF) which can degenerate with age or trauma and contribute to chronic back pain. There are currently no diseases modifying treatments that curb IVD degeneration. Regenerative therapies to treat IVD degeneration can be developed from identifying the signaling factors required for AF differentiation, but these factors are unknown. Previously, we showed that TGFβ signaling is required for AF formation in mice and …

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Model Invariant Visual Tracking Using Deep Learning Of Trajectories, Pravinkumar G. Kandhare Jan 2021

Model Invariant Visual Tracking Using Deep Learning Of Trajectories, Pravinkumar G. Kandhare

All ETDs from UAB

A target tracking is a well-known computer vision problem due to its wide range of applications in industrial and biomedical domains, such as traffic planning and management, surveillance, robotics, economics, human-computer interaction prediction, and electrode tracking for surgical planning. A significant amount of research has been done to tackle the problem. However, it is still challenging to design a robust tracking system that can provide solutions for many real-world tracking applications and prediction. Most of the proposed tracking solutions are complex due to many model parameters. The overarching goal of this dissertation is to develop predictors and trackers that would …

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A Role For Inf-Ɣ-Inducble Transcription Factors In Antibody Secreting Cell Differentiation, Jessica N. Peel Jan 2021

A Role For Inf-Ɣ-Inducble Transcription Factors In Antibody Secreting Cell Differentiation, Jessica N. Peel

All ETDs from UAB

Viral infections remain a major cause of morbidity and mortality. Within a viral, interferon (IFN)-ɣ-driven inflammatory microenvironment, B cells may produce antibody which is critical for rapid viral clearance and continued protection from reinfection. However, the roles of IFN-ɣ and IFN-ɣ-induced transcription factors (TFs) in driving antibody secreting cell (ASC) development from their B cell precursors are poorly understood. Herein, we identify two IFN-ɣ-inducible transcription factors (TFs), T-bet and interferon regulatory factor 1 (IRF1), that are essential for the differentiation of ASCs from IFN-g-activated B cell precursors. T-bet repressed an IFN-ɣ-inducible inflammatory gene program that was incompatible with ASC formation …

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Understanding The Role Of Biomechanics In Ovarian Cancer Biology, Alba Martinez Diaz Jan 2021

Understanding The Role Of Biomechanics In Ovarian Cancer Biology, Alba Martinez Diaz

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Mechanical forces including compression, tension, and shear stress are increasingly implicated as instigators of tumor progression. Understanding how mechanobiology drives ovarian cancer is critical to identifying potential therapies. The effect of shear stress is beginning to be studied in ovarian cancer due to the presence of ascites in the peritoneal cavity that prompts tumor cells detachment and implantation in secondary sites. Therefore, mechanical cues are present within the peritoneal cavity. A growing ovarian tumor mass also experiences compressive and tensile forces, although their participation in tumor progression still remains unclear. Additionally, there is a specific lack of incorporation of mechanobiology …

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Dynamic Biomechanical Characteristics Of The Optic Nerve Head By Oct Imaging, Jihee Kim Jan 2021

Dynamic Biomechanical Characteristics Of The Optic Nerve Head By Oct Imaging, Jihee Kim

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Approximately 80 million people in the world were estimated to suffer from glaucoma in 2020. To date, lowering intraocular pressure (IOP) is the only clinical treatment to delay or prevent the development and progression of glaucomatous vision loss. However, many glaucoma patients have IOP in the normal range, while some people with abnormally high pressure do not develop neuropathy. This indicates that biomechanical responses of the optic nerve head (ONH) to changes in IOP can vary significantly among individuals. This study investigated acute IOP-induced compliance in the ONH via SDOCT imaging, using computer vision, and deep learning networks to improve …

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A Novel In Vitro Model To Study Immune Interactions In Glioblastoma, Hasan Alrefai Jan 2021

A Novel In Vitro Model To Study Immune Interactions In Glioblastoma, Hasan Alrefai

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Glioblastoma (GBM) is the most common and lethal primary brain tumor in adults. Despite decades of research, GBM has a median survival of approximately 14 months, necessitating the development of novel GBM therapeutics. The drug-development process has been hindered due to the lack of high-fidelity pre-clinical models. While in-vitro models of patient-derived xenografts (PDX) present an interesting approach to modeling GBM, they typically fail to incorporate the non-cancerous cells that support tumor growth and progression. Others have attempted to address this problem by using techniques such as 3D bioprinting to incorporate astrocytes and macrophages in an extracellular matrix; however, they …

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Structural Changes To Desmosomal Architecture During Assembly And Maturation, Reena R. Beggs Jan 2021

Structural Changes To Desmosomal Architecture During Assembly And Maturation, Reena R. Beggs

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Desmosomes are macromolecular junctions important in adhesion and resisting mechanical stress in epithelial and cardiac tissue. Desmosomes have a complex architecture with transmembrane cadherins, desmogleins and desmocollins, constituting the adhesive interface and plaque proteins, including plakoglobin and desmoplakin, binding the cadherin tails and integrating with intermediate filaments. Dysregulation of desmosomes occurs in many disease states, such as cardiomyopathies, skin diseases, and various cancers. While mature desmosomes' structure is generally understood, less is known about desmosome architecture during assembly and recycling. Desmosomes are dynamic, biochemically intractable, and diffraction-limited, making them challenging to study. To overcome these obstacles, I applied the super-resolution …

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Caregiving And Depressive Symptomatology: Multi-National Testing Of Role Strain Theory, Jessica Valles Jan 2021

Caregiving And Depressive Symptomatology: Multi-National Testing Of Role Strain Theory, Jessica Valles

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While several studies have shown that caregiving duties are correlated with poor mental health outcomes, little is known about this association and how it varies by the type of care provided, as well as the other types of social roles that the caregiver occupies. Furthermore, the nature of these associations amongst caregivers who have been diagnosed with a chronic condition themselves is also unclear. Role Strain theory offers a foundation by which we can begin to understand the level of burden that results from occupying multiple social roles including that of caregiving. Using dating from the WHO Study on Global …

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Choking Under Pressure Detection Model Based On Expert System Foundation Using Tennis Performance Variables For Individual Performance Enhancement, Stepan Vancurik Jan 2021

Choking Under Pressure Detection Model Based On Expert System Foundation Using Tennis Performance Variables For Individual Performance Enhancement, Stepan Vancurik

All ETDs from UAB

Choking under pressure is a phenomenon understood as underperformance or suboptimal performance in a particular task or an action that occurs due to the presence of pressure situations. The phenomenon is feared by many people, especially athletes. Choking has been heavily addressed and studied in psychology and behavioral science research. Research works addressing the phenomenon have also been occasionally published in scientific literature; however, a structural approach to objectively measure, analyze, identify, and define its determinants is absent. Therefore, this dissertation study attempts to add to the existing choking research by proposing a novel approach for choking identification, analyzing domain …

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Effects Of Chemical Dispersant (Corexit® Ec9500a) On Gill Structure And Function, And The Associated Crustacean Hyperglycemic Hormone Mediated Stress Response In The Blue Crab (Callinectus Sapidus), Amanda Christine Weiner Jan 2021

Effects Of Chemical Dispersant (Corexit® Ec9500a) On Gill Structure And Function, And The Associated Crustacean Hyperglycemic Hormone Mediated Stress Response In The Blue Crab (Callinectus Sapidus), Amanda Christine Weiner

All ETDs from UAB

Chemical dispersants are fast becoming the most widely used tool in the remediation of spilled oil. The sheer magnitude of the Deepwater Horizon oil spill necessitated the use of multiple forms of remediation at scales never attempted. As a result, there is a critical need to understand how the spill and ensuing cleanup efforts impacted the surrounding ecosystem and its inhabitants. The goal of this research is to better understand the impact of the chemical dispersant (Corexit®EC9500A) on a key ecological and economic species, the blue crab (Callinectes sapidus), in the Gulf of Mexico. The first part of my dissertation …

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Polymeric Vesicles: Design, Synthesis And Characterization, Yiming Yang Jan 2021

Polymeric Vesicles: Design, Synthesis And Characterization, Yiming Yang

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Synthetic nanovesicles, known as liposomes, are assembled from synthetic lipids as encapsulation devices for delivery of small molecules and are now a key component of COVID-19 mRNA vaccines. Due to their similarity to a cell membrane, liposomes also find use in anticancer treatment to reduce toxic side effects of chemotherapy. However, synthetic liposomes may require a multi-step synthesis, and very often show poor physical and chemical stability. In contrast, polymeric vesicles (polymersomes) assembled from synthetic polymers can boast much better mechanical and chemical stabilities and provide stimuli responsiveness that can enhance targeted drug delivery and provide drug release on-demand. Polymersomes …

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Biological Pathways And Processes Underlying The Cardiac Regenerative Response Post-Injury In Small And Large Mammals, Eric Yang Zhang Jan 2021

Biological Pathways And Processes Underlying The Cardiac Regenerative Response Post-Injury In Small And Large Mammals, Eric Yang Zhang

All ETDs from UAB

Mammalian cardiomyocytes exit the cell-cycle shortly after birth. Consequently, the adult heart is unable to properly compensate for cardiac muscle lost to injury. As such, heart failure has remained the leading cause of death in the developed world for more than three decades. In this work, we illustrate our findings in using novel in-vivo animal models to examine two regenerative phenomena observed following myocardial injury:i.) neonate cardiomyocyte proliferation in large mammals ii.) the ‘paracrine effect’ as mediated by mesenchymal stromal cells In i.) we use a large animal model of myocardial injury during the early postnatal develop-mental stage to establish …

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Aerodynamic Analysis Of Utility Truck Safety In Severe Environments, Haibo Zhu Jan 2021

Aerodynamic Analysis Of Utility Truck Safety In Severe Environments, Haibo Zhu

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In the present study, the stability of utility trucks under strong wind conditions is analyzed. Since the lateral area of trucks is larger than that of ordinary vehicles, the impact of crosswind on trucks is the most serious. Therefore, the main consideration was to simulate the impact of crosswind conditions on the truck. The research direction of crosswinds affecting the performance of utility trucks can be divided into two major aspects: one is to consider crosswind aerodynamics, and the other is to test crosswind stability. In order to study the crosswind aerodynamics of the truck, the influence of the change …

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Midpalatal Suture Maturation Stage Evaluation In Young Adults, Anna Maria Betlej Jan 2021

Midpalatal Suture Maturation Stage Evaluation In Young Adults, Anna Maria Betlej

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Rapid palatal expansion (RPE) is a gold standard treatment for posterior unilateral and bilateral crossbites or limited buccal overjet in patients with constricted maxilla. Midpalatal suture fusion is a limitation for obtaining the skeletal results and avoiding dental side effects. It is generally believed that midpalatal suture interlock increases significantly after the pubertal growth spurt. However, in the literature there are reported cases of successful midpalatal suture split in older adults. Individual cone-beam computed tomography (CBCT) assessment of midpalatal suture maturation was proposed by Angelieri et al. Since RPE treatment approach is commonly used it is important to understand the …

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Topics In Low Dimensional Dynamical Systems: Interval Rotation Numbers And Laminations, Sourav Bhattacharya Jan 2021

Topics In Low Dimensional Dynamical Systems: Interval Rotation Numbers And Laminations, Sourav Bhattacharya

All ETDs from UAB

The goal of this thesis is to study two broad disciplines: \emph{One Dimensional Dynamical Systems and Complex Dynamical Systems} in the spirit of \emph{``Developing efficient machinery to make conclusions about the dynamics of a given map $f$ from reduced information''}. In \emph{One Dimensional Dynamical Systems}, we accomplish the above stated goal by studying the \emph{forcing relation} among \emph{over-rotation numbers} of points on the interval. We began by discovering peculiar \emph{patterns} named \emph{very badly ordered patterns}, having no \emph{block structure} over an \emph{over-twist pattern}. It has been proved that unlike \emph{circle maps} these patterns \emph{surprisingly} don't \emph{force} a lower \emph{over-rotation number} …

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Stress And Neuropeptide Y: Hippocampal Crossroads, Mariana Andrea Cortes Jan 2021

Stress And Neuropeptide Y: Hippocampal Crossroads, Mariana Andrea Cortes

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Anxiety disorders are the most common neuropsychiatric disorders diagnosed in adolescence and adulthood. While most animal models of trauma and stress-related disorders are performed in adults, and clinical trials for the treatment of these disorders typically include adult patients, there is a gap in knowledge for understanding how traumatic disorders develop in adolescence. Neuropeptide Y (NPY) is an endogenous peptide that provides anxiolytic benefits, and promotes feeding, arousal, and reduces inflammation. While being reduced in patients with depression and post-traumatic stress disorder (PTSD), animal models using NPY injections directly in to hippocampus have found it to be sufficient for blocking …

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Queen Of Swords, Mary Elizabeth Chambliss Jan 2021

Queen Of Swords, Mary Elizabeth Chambliss

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Queen of Swords, titled after a card in the tarot signifying an independent, incisive woman that often keeps others at “sword’s length,” is the fictional story of Birmingham heiress Reagan Norcross. Beautiful, educated, wealthy, and accomplished, Reagan is more unhappy than she’s ever been. So when an old fling, Russell Harris, takes a job at her family’s construction and design firm, Norcross Lasting, it seems like a sign that everything is going to turn around. But even as her interactions with Russell in and out of the office become more like a romance novel, Reagan’s unhappiness and instability only get …

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The Hocl Response Of Escherichia Coli., Rhea Marie Derke Jan 2021

The Hocl Response Of Escherichia Coli., Rhea Marie Derke

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Inflammatory bowel diseases (IBDs), like Chron’s disease and ulcerative colitis, affect millions of people worldwide. There are limited treatment options available for these diseases because their direct causes are unknown. IBDs are characterized by chronic inflammation of the gastrointestinal tract and changes in the composition of the gut microbiome. Enterobacteria, including Escherichia coli, bloom to high levels in the gut during inflammation and contribute to the pathology of IBDs. E. coli must tolerate high levels of antimicrobial compounds produced by the immune system to survive during persistent inflammation. A large proportion of such compounds are reactive oxygen and reactive chlorine …

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Cognitive Progression And Care Patterns In All-Cause Dementia By Prior Cancer Diagnosis, Mackenzie Elisha Fowler Jan 2021

Cognitive Progression And Care Patterns In All-Cause Dementia By Prior Cancer Diagnosis, Mackenzie Elisha Fowler

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Cancer and dementia are common aging-related diseases. Cancer and itstreatments are associated with cognitive impairment referred to as cancer-related cognitive impairment (CRCI). Dementias demonstrate similar impairment. Only one study has examined the longitudinal association between cancer and dementia. This dissertation goes beyond limitations of the prior study and has three aims: 1.) to evaluate dementia progression by prior cancer diagnosis, 2.) to evaluate progression of all-cause dementia by cancer treatments, and 3.) to evaluate patterns and predictors of care among dementia patients by cancer history. This study uses EHR data to evaluate cognitive progression by cancer history /cancer treatment characteristics, …

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Identifying Novel Therapeutics And Therapeutic Entry Points For The Treatment Of Duchenne Muscular Dystrophy Through Regulation Of Gene Expression, Rylie Maria Hightower Jan 2021

Identifying Novel Therapeutics And Therapeutic Entry Points For The Treatment Of Duchenne Muscular Dystrophy Through Regulation Of Gene Expression, Rylie Maria Hightower

All ETDs from UAB

My graduate research has primarily focused on genetic and epigenetic modifiers of Duchenne muscular dystrophy and understanding how those modifiers can be used as novel therapeutic entry points for treatment. A vast array of promising therapeutic strategies is being explored outside the realm of directly targeting dystrophin deficiency. This is primarily due to the lack of successful clinical trials that have demonstrated the ability to benefit a significant number of DMD patients. Here, I have expanded the field’s understanding of using the regulation of gene expression as a way to target dystrophin-deficiency associated pathology through, 1) therapeutic treatment of a …

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