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Articles 4351 - 4380 of 7368
Full-Text Articles in Entire DC Network
The Role Of Methyl Cpg Binding Domain Protein 2 (Mbd2) In The Regulation Of Embryonic And Fetal Β-Type Globin Genes, Merlin Nithya Gnanapragasam
The Role Of Methyl Cpg Binding Domain Protein 2 (Mbd2) In The Regulation Of Embryonic And Fetal Β-Type Globin Genes, Merlin Nithya Gnanapragasam
Theses and Dissertations
The reexpression of the fetal γ-globin gene in adult erythrocytes is of therapeutic interest due to its ameliorating effects in β-hemoglobinopathies. We recently showed that Methyl CpG Binding Domain Protein2 (MBD2) contributes to the silencing of the chicken embryonic ρ-globin and human fetal γ-globin genes. We further biochemically characterized an erythroid MeCP1 complex that is recruited by MBD2 to mediate the silencing of these genes. These observations suggest that the disruption of the MeCP1 complex could augment the expression of the fetal/embryonic globin genes. In the studies presented in chapter 2, we have pursued a structural and biophysical analysis of …
The Role Of The Methyl Dna Binding Domain Protein 2 (Mbd2) In Breast Cancer, Omar Mian
The Role Of The Methyl Dna Binding Domain Protein 2 (Mbd2) In Breast Cancer, Omar Mian
Theses and Dissertations
Methyl-CpG Binding Proteins (MCBPs) are thought to function as the interpreters of epigenetic information encoded in cytosine methylation. Their ability to translate DNA methylation into local transcriptional repression has sparked interest in the role of Methyl-Binding Domain Proteins (MBDs) in cancer, where repatterning of CpG methylation is common. In this dissertation I summarize and discuss observations made in the Ginder Lab linking MCBPs to the progression of neoplastic disease. It is clear from our work that the Methyl Binding Domain Protein 2 (MBD2) is necessary for the persistent repression of critical tumor suppressor genes in breast cancer. We show that …
Interplay Between Keratin And Vimentin Expression In Oral Cancer, Mary Catherine Mcginn
Interplay Between Keratin And Vimentin Expression In Oral Cancer, Mary Catherine Mcginn
Theses and Dissertations
Previous research in our laboratory found that inhibiting expression of vimentin, a marker of epithelial-to mesenchymal transition, inhibited cell growth and motility in vitro and in vivo. Tumors derived from vimentin knockdown cells showed features of epithelial redifferentiation and increased expression of differentiation-specific keratins. It is unknown what causes re-expression of keratins when vimentin is inhibited. Although, canonical Wnt signaling may activate NF-κB and repress of keratin and/or induce vimentin expression through β-catenin. We hypothesize that downregulation of differentiation-specific keratins contributes to tumor progression, mediated directly or indirectly by expression of vimentin. Vimentin-negative HN4 cells were transfected with plasmids encoding …
Periodontal Bacterial-Dna Initiated Immuno-Inflammatory Responses In Human Osteoblastic Cells, Chebel Najib Bou
Periodontal Bacterial-Dna Initiated Immuno-Inflammatory Responses In Human Osteoblastic Cells, Chebel Najib Bou
Theses and Dissertations
Periodontitis is a chronic inflammatory disease initiated by gram negative anaerobic bacteria. These bacteria possess pathogen-associated molecular patterns (PAMPs) that interact with various receptors including Toll like receptors (TLRs). Bacterial DNA (bDNA) is one of the PAMPs mainly recognized by TLR9. Interaction of bDNA and its receptors leads to activation of inflammatory signaling pathways potentially resulting in periodontal bone destruction. The aim of this study was to determine the production of IL- 6 and IL-8 in response to periodontal bDNA from human osteoblastic cells (MG-63). MG- 63 cells were stimulated in duplicate for 20 hours with 100ng/μl of bDNA from …
Ipla2Β, Alternative Splicing And Apoptosis Of Pancreatic Islets, Bhargavi Emani
Ipla2Β, Alternative Splicing And Apoptosis Of Pancreatic Islets, Bhargavi Emani
Theses and Dissertations
Ceramides are bioactive lipids that can promote splicing of apoptosis-related genes, including caspase 9 and BCL-x. A recent study demonstrated that expression of neutral sphingomyelinase (NSMase), an enzyme that hydrolyzes sphingomyelins to generate ceramide, is regulated by Group VIA phospholipase A2 (iPLA2β)-dependent mechanism during β-cell apoptosis. This prompted us to hypothesize that iPLA2 is upstream of ceramide generation in the process regulating splicing of apoptotic genes. To test this, Jurkat T cells were treated with the selective inhibitor of iPLA2β, bromoenol lactone (BEL), RNA was isolated and converted to cDNA, and caspase 9 and BCL-x mRNA viii species were amplified …
Alternative Regulation Of The Alginate Algd Operon By An Activated Algb In Nonmucoid Pseudomonas Aeruginosa Is Dependent On Sigma 54, Jean Kim
Theses and Dissertations
Alginate overproduction by Pseudomonas aeruginosa, which causes a mucoid phenotype, is a major virulence factor associated with chronic pulmonary infections in cystic fibrosis patients. Expression of the algD operon for alginate biosynthesis requires three major regulators in association with the ECF sigma factor, σ22, in mucoid strains that are typically defective in anti-sigma factor, MucA. One such algD regulator is AlgB, a member of the NtrC family of two-component systems, which typically utilize σ54. However, neither σ54 nor the cognate sensor kinase (KinB) of AlgB are required for algD expression in such mucoid strains. I hypothesized that KinB-phosphorylated AlgB must …
Influence Of Retinal States On The Development And Maintenance Of Retinofugal Projections, Duncan Morhardt
Influence Of Retinal States On The Development And Maintenance Of Retinofugal Projections, Duncan Morhardt
Theses and Dissertations
Vision provides a critical interface with the physical world. This work examines visual development and vision loss in mice to glean the influence of the retinal state on visual connections. I first assessed the impact of retinal activity on the eye-specific segregation of retinal afferents in the lateral geniculate nucleus (LGN) of young Gβ5 -/- mice. Gβ5 is the fifth member of the β subfamily of heterotrimeric G proteins. Gβ5 binds and stabilizes the R7 family of regulators of G-protein signaling (RGS), which accelerate Gi/o GTP hydrolysis. Gβ5 -/- mice, which lack R7RGS activity, have malformed synapses in the outer …
Novel Cinnamic Acid-Based Dehydropolymers For Emphysema: In Vitro And In Vivo Assessment Of Their Activities, Bhawana Saluja
Novel Cinnamic Acid-Based Dehydropolymers For Emphysema: In Vitro And In Vivo Assessment Of Their Activities, Bhawana Saluja
Theses and Dissertations
Pulmonary emphysema is a serious worldwide illness, causing progressive and irreversible alveolar wall loss and difficulty in breathing. It is caused mostly by cigarette smoking. However, its unresolved complex and multiple pathogenic mechanisms have left this disease without effective pharmacotherapy. This project hypothesized that cinnamic acid-based dehydropolymers (DHPs), originally discovered as novel anti-coagulants, protect against emphysema through their potent triple inhibitory actions against oxidative stress, inflammation and elastase, some of the pathogenic mechanisms associated with this disease. Three in vitro inhibitory activity assays for oxidative stress, lung inflammation and neutrophil elastase (NE) were developed and used to identify the most …
Cell-Cell Junction Signaling Regulating Dna Double-Strand Break Repair In Breast Cells, Sinduja Ethiraj
Cell-Cell Junction Signaling Regulating Dna Double-Strand Break Repair In Breast Cells, Sinduja Ethiraj
Theses and Dissertations
Genomic instability and acquisition of invasiveness through the basement membrane extracellular matrix (ECM) are two major processes for epithelial cell malignancy in breast cancer. DNA double-strand break repair (DSBR) is one of the processes that get misregulated during breast cancer progression. In addition, radiation induced breaks such as those induced during radiation therapy to treat breast cancer patients are repaired by DSBR, rendering this pathway relevant for therapy as well. DSBR can occur either by homologous recombination (HR) or non-homologous end-joining (NHEJ). HR is accepted as the more error-free pathway. HR is regulated by the cell cycle status such that …
Modeling Hydrophobic Effects At Different Lengthscales, Jihang Wang
Modeling Hydrophobic Effects At Different Lengthscales, Jihang Wang
Theses and Dissertations
Understanding hydrophobic effects at different length scales is relevant to many complex and poorly understood everyday phenomena in materials science and biology. In this thesis, a variety of theory/computational methods in statistical physics and statistical mechanics are used to address three separated, but interconnected problems: (1) How solvation free energy scales with a partical size that is charged? This problem has never been attempted to solve before despite its immense importance in colloidal and protein solutions (J. Wang, D. Bratko, K. Leung and A. Luzar, Hydrophobic hydration at different length-scales: manipulating the crossover by charges, to be submitted to J. …
Patient Ventilator Dyssynchrony: Types, Frequency And Patterns In Critically Ill Adults, Karen Mellott
Patient Ventilator Dyssynchrony: Types, Frequency And Patterns In Critically Ill Adults, Karen Mellott
Theses and Dissertations
Patient ventilator dyssynchrony (PVD) occurs frequently, but little is known about the types, frequency and patterns of PVD for longer than 30 minutes. Deeper levels of sedation are associated with PVD. Evaluation of ventilator graphics and the ability to identify PVD should assist clinicians to optimize patient ventilator interactions and promote earlier interventions. The purpose of this study was to identify the different types, frequency and patterns of PVD in critically ill adults and determine the effect of sedation level on PVD. Thirty medical and surgical ICU adult patients were enrolled; 27 were used for analysis. Pressure/time and flow/ time …
Contributions Of Neglect Subtypes And Family History In Dsm-Iv Disorders: Findings From The Ncs-R, Leanne Heaton
Contributions Of Neglect Subtypes And Family History In Dsm-Iv Disorders: Findings From The Ncs-R, Leanne Heaton
Theses and Dissertations
Despite the prevalence of neglect in the child welfare system, understanding of the etiology of neglect remains limited in scope. Limitations are driven by the frequent reliance on child protective services (CPS) data which consists of identified cases and consequently, the most serious of all cases, or through a few population based studies that operationalize neglect as a homogenous phenomenon rather than as distinct subtypes. Furthermore, most studies of neglect focus on maternal deficiencies while paternal factors are largely ignored. This study is meant to address these considerations by utilizing the National Comorbidity Survey Replication (NCS-R), a broad population based …
Generation Y And Vocal Fry, Paul Michael Valley
Generation Y And Vocal Fry, Paul Michael Valley
Theses and Dissertations
In this thesis, the author explores a vocal phenomenon called “vocal fry” and why this dysphonia has emerged as one of the primary means of communication for the population referred to as “Generation Y.” The first chapter defines what vocal fry is and why it is of modest value to the stage actor. The second chapter defines the physiological means by which the human body creates sound, what good sound is and how vocal fry is created. The third and fourth chapters define several generations as well as what defines Gen Y, and the communication physiologies associated with those generations. …
A Verbal Snapshot Of Visual Scrutiny Primarily In The Sphere Of Art, Matthew Alverson
A Verbal Snapshot Of Visual Scrutiny Primarily In The Sphere Of Art, Matthew Alverson
Theses and Dissertations
Finding and extracting meaning from the world I encounter every day is the primary motivation behind my creativity. Filtering perception and separating the important bits of information by selection or elimination is the crux of this investigation. This process is one of finding rationale in futility and applying meaning to meaningless encounters. The significance of life is not fixed and it is our responsibility to make it up to best suit the desire to have purpose. Depending on the way something is looked at determines the meaning behind it. Anything can have content if it is seen and translated a …
The Prognostic Potential Of The Epidermal Growth Factor Receptor And Nuclear Factor Kappa B Pathways And Associated Therapeutic Strategies In Patients With Squamous Cell Carcinoma Of The Head And Neck, Pamela Wirth
Theses and Dissertations
Little is known about the signaling pathways that contribute to treatment response in advanced stage head and neck tumors. Increased expression of epidermal growth factor receptor (EGFR) and downstream pathways such as nuclear factor kappa B (NFκB) are implicated in aggressive tumor phenotypes and limited response to therapy. This study explored the rationale for combining the proteasome inhibitor bortezomib with the EGFR inhibitor gefitinib in a subset of head and neck squamous cell carcinomas with high EGFR gene amplification. Drug responses of gefitinib and bortezomib as single agents and in combination within head and neck squamous cell carcinoma cell lines …
Computational Modeling Of Biochemical Systems Using Cellular Automata, Advait Apte
Computational Modeling Of Biochemical Systems Using Cellular Automata, Advait Apte
Theses and Dissertations
Biological systems exhibit complex behaviors through coordinated responses of individual biological components. With the advent of genome-scale techniques, one focus has been to develop methods to model interactions between components to accurately describe intact system function. Mathematical modeling techniques such as constraint-based modeling, agent-based modeling, cellular automata (CA) modeling and differential equation modeling are employed as computational tools to study biological phenomenon. We have shown that cellular automata simulations can be used as a computational tool for 12 predicting the dynamics of biological systems with stochastic behavior. The basic premise for the research was the observations made during a study …
The Association Between Lead Exposure And Respiratory Health In Children, Colleen Coleman
The Association Between Lead Exposure And Respiratory Health In Children, Colleen Coleman
Theses and Dissertations
Purpose: The substantial impact of indoor air quality and environmental hazards in the home on one’s health has long been recognized in the field of public health. This cross-sectional study investigates the risk between home based hazards, specifically lead, and respiratory health in children. The objective of this study is to examine the extent to which children testing positive for blood lead exposure are at an increased risk for having poor respiratory health. Methods: A nationally representative sample of 977 children ages 1- 6 years was obtained from the 2005-2006 National Health and Nutrition Examination Survey (NHANES). Information from the …
Investigation Of The Mechanical Properties Of Poly (Ethylene Glycol) Diacrylate By Nanoindentation Using Atomic Force Microscopy, Zouheir Drira
Investigation Of The Mechanical Properties Of Poly (Ethylene Glycol) Diacrylate By Nanoindentation Using Atomic Force Microscopy, Zouheir Drira
Theses and Dissertations
Poly (ethylene glycol) (PEG) hydrogel based polymers are among the most widely used synthetic materials for biomedical applications. Because of their biocompatibility, and ease of fabrication, hydrogels are highly suitable for use as constructs to engineer tissues as well as for cell transplantation. A critical parameter of importance for PEG hydrogels is their mechanical properties which are highly dependent on the environmental conditions. Properties of PEG-based hydrogels can be engineered to resemble scaffolds composed of extracellular matrix molecules, which provide structural support, adhesive sites and mechanical as well as biomechanical signals to most cells. The mechanical properties of these synthetic …
Talk To Me, I Am Listening, Larbi Sami Ben
Talk To Me, I Am Listening, Larbi Sami Ben
Theses and Dissertations
An introductory conversation with a new person I just met usually goes like this: So, where is your accent from ? Are you American? Well, yes, .....but no. Not really. I do have American citizenship and I lived in the US for fifteen years but I grew up in France. Ok, so you’re French? Well, yes, but .....not totally. My mother is French but my father is Tunisian. Ok, so you’re Tunisian? Well, yes, but... not wholly. I don’t speak Arabic, so I don’t totally feel Tunisian. So what are you? American? French? Tunisian? With my work, I ask the …
Automated Methods For Fiber Diameter Measurement Of Fibrous Scaffolds, Anna Bulysheva
Automated Methods For Fiber Diameter Measurement Of Fibrous Scaffolds, Anna Bulysheva
Theses and Dissertations
The purpose of this work was to develop an automated method of measuring fiber diameters of electrospun scaffolds from scanning electron microscopy images of these scaffolds. Several automated methods were developed and evaluated by comparison to known values and data obtained via the standard manual method. Simulated images with known diameters were used as test images to evaluate the accuracy of each measurement technique. Eight scanning electron microscopy images were also used for the evaluation of the automated methods compared to the standard manual method. All diameter measurements were made in pixels. Five new automated methods coded in MATLAB were …
Multidimensional Methods: Applications In Drug-Enzyme Intrinsic Clearance Determination And Comprehensive Two-Dimensional Liquid Chromatography Peak Volume Determination, Dennis Thekkudan
Theses and Dissertations
The goal of the first project was to evaluate strategies for determining the in vitro intrinsic clearance (CLint) of dextrorphan (DR) as metabolized by the UGT2B7 enzyme to obtain dextrorphan glucuronide (DR-G). A direct injection liquid chromatography-mass spectrometry (LC-MS) method was used to monitor products using the pseudo-first-order (PFO) model. Standard enzymatic incubations were also quantified using LC-MS. These data were fit utilizing both PFO and Michaelis-Menten (MM) models to determine estimates of kinetic parameters. The CLint was determined to be 0.28 (± 0.08) µL/min/mg protein for a baculovirus insect cell-expressed UGT2B7 enzyme. This is the first confirmation that dextrorphan …
Vitamin B6 Metabolism And Regulation Of Pyridoxal Kinase, Amit Gandhi
Vitamin B6 Metabolism And Regulation Of Pyridoxal Kinase, Amit Gandhi
Theses and Dissertations
Pyridoxal 5'-phosphate (PLP) is the cofactor for over 140 vitamin B6 (PLP)-dependent enzymes that are involved in various metabolic and biosynthetic pathways. Pyridoxal kinase (PL kinase) and pyridoxine 5’-phosphate oxidase (PNP oxidase) are the two key enzymes that metabolize nutritional forms of vitamin B6, including pyridoxal (PL), pyridoxine (PN), and pyridoxamine (PM) to the active cofactor form, PLP. Disruption of the PLP metabolic pathway due to mutations in PNP oxidase or PL kinase result in PLP deficiency, which is implicated in several neurological pathologies. Several ingested compounds are also known to result in PLP deficiency with concomitant neurotoxic effects. How …
Association Between Preconception Multivitamin Use And The Risk Of Preeclampsia/High Blood Pressure In Pregnant Women, Krisandra Allen
Association Between Preconception Multivitamin Use And The Risk Of Preeclampsia/High Blood Pressure In Pregnant Women, Krisandra Allen
Theses and Dissertations
Gestational Hypertension and Preeclampsia are significant causes of morbidity and mortality among pregnant women and neonates. This study examined the relationship between multivitamin use and incidence of reported high blood pressure or preeclampsia using data from the 2007 Oregon State Pregnancy Risk Assessment Monitoring System (PRAMS). Overall there were n=1894 women included in the study. Women were asked two to four months after delivery to report their multivitamin or prenatal vitamin usage in the month prior to conception and were categorized as daily users, or less than daily users. The unadjusted prevalence of high blood pressure or preeclampsia was 13.4% …
An Examination Of Factors That Influence Friendships In Young Adults From Intact And Divorced Families, Stephanie Wolf
An Examination Of Factors That Influence Friendships In Young Adults From Intact And Divorced Families, Stephanie Wolf
Theses and Dissertations
Specific factors affecting young adult friendship development have been identified by the literature with little focus on which are most influential in determining friendship composition.. Hierarchical regression was used to examine such factors. Participants included 400 undergraduate Psychology students at a state university in the mid-Atlantic region. Findings indicated parental relationships were the strongest predictor of friendship quality. Parent-child bonds, conflict between parents, and emotion regulation skills best predicted levels of intimacy. Parent-child bond-especially with mother-best predicted satisfaction with friendship network as did conflict between parents. In addition, parent-child bond with mother and conflict between parents were found more important …
Use Of Oral Chemotherapeutic Medications In Non-Traditional Ambulatory Settings, Sameer Arora
Use Of Oral Chemotherapeutic Medications In Non-Traditional Ambulatory Settings, Sameer Arora
Theses and Dissertations
Background: Cancer is the second leading cause of death in economically developed countries. The use and availability of oral treatment for cancer has increased dramatically in the past 10 years. Few studies have described the use of oral chemotherapy in non-traditional ambulatory settings by health care professionals across different specialties. Objective: The purpose of this study is to describe the usage of oral chemotherapeutic medications in ambulatory settings. Methods: Cross sectional study of 2007 NAMCS Survey analysis involving 21,761 subjects aged 18 years and above with cancer who participated in the 2007 National Ambulatory Medical Survey (NAMCS). Main Outcome Measure: …
Association Between Obesity And Depression And Anxiety Disorders: Results From The 2008 National Health Interview Survey, Monica Gaidhane
Association Between Obesity And Depression And Anxiety Disorders: Results From The 2008 National Health Interview Survey, Monica Gaidhane
Theses and Dissertations
Introduction: Obesity is one of the most important medical problems in the U.S. and is considered to be an epidemic with over 30% of the population being obese. Obesity is associated with increased risk of hypertension, diabetes, cardiovascular diseases, certain cancers and a shorter life expectancy. Recent studies have shown that higher BMI levels are also significantly associated with several lifetime mental disorders such as major depressive disorder, anxiety disorders as well as panic attacks and panic disorders. Purpose: The purpose of this study was to quantify the extent to which higher BMI increased the likelihood of Depression, Anxiety Disorder …
Enhanced Environmental Detection Of Uranyl Compounds Based On Luminescence Characterization, Jean Nelson
Enhanced Environmental Detection Of Uranyl Compounds Based On Luminescence Characterization, Jean Nelson
Theses and Dissertations
Uranium (U) contamination can be introduced to the environment as a result of mining and manufacturing activities related to nuclear power, detonation of U-containing munitions (DoD), or nuclear weapons production/processing (DOE facilities). In oxidizing environments such as surface soils, U predominantly exists as U(VI), which is highly water soluble and very mobile in soils. U(VI) compounds typically contain the UO22+ group (uranyl compounds). The uniquely structured and long-lived green luminescence (fluorescence) of the uranyl ion (under UV radiation) has been studied and remained a strong topic of interest for two centuries. The presented research is distinct in its objective of …
Zooplankton Abundance, Community Composition And Grazing In The James River Estuary (Virginia, Usa), Laura E. Barry
Zooplankton Abundance, Community Composition And Grazing In The James River Estuary (Virginia, Usa), Laura E. Barry
Theses and Dissertations
This study examined the extent to which zooplankton in the James River Estuary (Virginia, USA) exploit the available algal-food resources. Zooplankton abundance, community composition and grazing rates were assessed at three locations which included a site with high algal production (near the VCU Rice Center) and two sites where algal production was lower. Grazing rates were measured by determining the rate of phytoplankton decline (as chlorophyll a) during 48-hour incubation experiments in the presence and absence of zooplankton. Significant differences in zooplankton abundance were observed among the three sites, with the greatest average zooplankton density (434 ± 69 ind/L) occurring …
Commonwealth Times 2009-12-03 [Front Page Has 2009-11-30]
Commonwealth Times 2009-12-03 [Front Page Has 2009-11-30]
Commonwealth Times, 1969-
No abstract provided.
Histone Deacetylase Inhibitors And Innate Immunity In Septic Shock, Joseph Bertsche
Histone Deacetylase Inhibitors And Innate Immunity In Septic Shock, Joseph Bertsche
Theses and Dissertations
Innate immunity depends on pattern recognition receptors, which recognize pathogen associated molecular patterns (PAMPS), such as Toll-like receptor 4 (TLR4), which detects the gram-negative bacterial toxin, lipopolysaccharide. Engagement of TLR4 by LPS sets off a cascade ending in the activation of pro-inflammatory cytokines and interferon-β (IFN-β) which alerts the host to the infection. However, these responses can be mal-adaptive, especially in the context of bacterial sepsis, where a "cytokine storm" results in death of the host. Pharmacological modulation of these responses may therefore be a promising treatment modality. Inhibition of classic pro-inflammatory cytokines such as IL-1β and TNF-α has been …