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Articles 14491 - 14520 of 19641
Full-Text Articles in Entire DC Network
Influence Of Latitudinal And Climatic Variation, And Field Observations, On Spring Gobbling Phenology Of Wild Turkey In Mississippi, Matthew David Palumbo
Influence Of Latitudinal And Climatic Variation, And Field Observations, On Spring Gobbling Phenology Of Wild Turkey In Mississippi, Matthew David Palumbo
Theses and Dissertations
Spring hunting season for wild turkey (Meleagris gallopavo) in Mississippi is designed to coincide with peak gobbling activity. The Mississippi Department of Wildlife, Fisheries and Parks (MDWFP) uses brood surveys and hunter observations to forecast gobbling activity. Hunters claimed hunting season does not coincide with regional gobbling peaks. I conducted statewide surveys to assess latitudinal and climatic influences in gobbling activity and used long-term (1996-2008) MDWFP data to evaluate use as a forecasting tool. I observed ≥ 66% of all spring gobbling with an approximate 2-week difference in peak gobbling activity between northern and southern Mississippi. Gobbling in the north …
The Impact Mct2 Has On An Elementary And Middle School Reading And Language Arts Classroom Instruction In Mississippi, Sarah Elizabeth Campbell
The Impact Mct2 Has On An Elementary And Middle School Reading And Language Arts Classroom Instruction In Mississippi, Sarah Elizabeth Campbell
Theses and Dissertations
The purpose of this study was to understand what No Child Left Behind (NCLB) meant to teachers in Mississippi and to determine what impact this reform had on reading and language arts classroom instruction for teachers. Qualitative research methods in the form of interview data and classroom observations were used to examine teachers’ perceptions of accountability and its effects on classroom instruction. Teachers were asked to answer a set of research interview questions related to research questions. The specific research questions used to explore teachers’ perceptions about accountability were (1) What are reading and language arts teachers’ perceptions of accountability? …
Molecular Approaches For Characterization Of Biodegradation Genes Expressed During Microbial Colonization On Decay-Resistant And Non-Resistant Woods In Forest Soil, Youngmin Kang
Theses and Dissertations
White and brown-rot fungi damage wood by production of enzymes that attack the structural components. The objective of this study was to characterize decay related genes and proteins that are expressed on three different wood types undergoing decay over 18 months. Variation in gene expression, presence of decay enzymes and proteins were determined for untreated pine (non-resistant), western red cedar (naturally durable), and alkaline copper quaternary (ACQ) treated pine (chemically resistant) exposed in a soil decay bed test. Decay was assessed by visual decay ratings, dynamic modulus of elasticity (MOE), and microscopy. There were no significant differences in decay between …
The Suitability Of Lidar-Derived Forest Attributes For Use In Individual-Tree Distance-Dependent Growth-And-Yield Modeling, Hilary Alexis Londo
The Suitability Of Lidar-Derived Forest Attributes For Use In Individual-Tree Distance-Dependent Growth-And-Yield Modeling, Hilary Alexis Londo
Theses and Dissertations
Studies have not been conducted examining the influence of the spatial distribution of LiDAR-derived tree measuresments and their affects the predictive ability of LiDAR-derived forest metrics as input for growth-and-yield analysis on individual trees. This study addresses both of these voids in current knowledge and determines the suitability, concerns and application of LiDAR for time-series analysis, specifically forest growth-and-yield. LiDAR datasets of the same site acquired in 1999, 2000, 2002, and 2006 by different vendors using different specifications were utilized in this study. Directional differences of Lidar-identified tree top locations were examined. Minimal location differences were noted, but no bias …
Determination Of Antioxidant And Total Phenolic Content Of Pueraria Lobata And Evaluation Of Novel Food Products Containing Kudzu, Sandra Lynn Blalock Burney
Determination Of Antioxidant And Total Phenolic Content Of Pueraria Lobata And Evaluation Of Novel Food Products Containing Kudzu, Sandra Lynn Blalock Burney
Theses and Dissertations
Kudzu (Pueraria lobata) is an edible vine from the legume family native to China but growing prolifically throughout the southeastern United States. Legumes are abundant in the beneficial compounds phytoestrogens, specifically isoflavones. This research analyzed Mississippi-grown kudzu roots, leaves, and flowers for antioxidant activity and total phenolic content and evaluated consumer acceptability of food products containing kudzu. Results indicated kudzu flowers, roots, and leaves contained phenolic compounds and the antioxidant activity amounts in flowers, roots, and leaves were 77.9%, 75.7%, and 56.5%, respectively. The dip products that were developed and evaluated were mayonnaise- and sour cream-based dips that contained either …
Macrophyte Re-Establishment And Deductive Gis Modeling To Identify Planting Locations For Fish Habitat Enhancement Projects, Jonathan Paul Fleming
Macrophyte Re-Establishment And Deductive Gis Modeling To Identify Planting Locations For Fish Habitat Enhancement Projects, Jonathan Paul Fleming
Theses and Dissertations
Aquatic macrophytes are important components in structuring aquatic communities because they provide physical and biological functions that contribute to the stability of the ecosystem. Macrophytes provide the basis for the aquatic food-web and also provide habitat and refugia for aquatic fauna. In systems that lack macrophytes, anthropogenic re-establishment may be a feasible management approach to improve aquatic ecosystems. Understanding environmental factors that regulate colonization, dispersal, and persistence of aquatic macrophytes is pertinent to re-establishment efforts. The purpose of this study is to test hypotheses regarding success of macrophyte re-establishment efforts in Little Bear Creek Reservoir, Alabama using different macrophyte species, …
Making Milking Modern: Agriculture Science And The American Dairy, 1890-1940, Micah Aaron Rueber
Making Milking Modern: Agriculture Science And The American Dairy, 1890-1940, Micah Aaron Rueber
Theses and Dissertations
In the late nineteenth century most dairy farmers went about their work in much same manner as had their predecessors centuries earlier. However, by 1940 most farmers practiced recognizably modern dairying techniques. Use of mechanical milking machines was widespread and growing, farmers compounded rations by combining feeds that blended precise proportions of proteins, carbohydrates, fats, and vitamins, and breeders, eager to maximize the influence of productive bloodlines, evaluated their animals with the use of scientific scorecards and employed intense breeding plans that relied on various forms of inbreeding in order to fix the desirable aspects of prized cattle. Yet the …
Development And Implementation Of A Tissue Specific Microrna Prediction Tool For Identifying Targets Of The Tumor Suppressor Microrna 17-3p, William Budd
Theses and Dissertations
A unique computational approach was undertaken to identify targets of miR-17-3p that impart an oncogenic potential to the cells of the prostate. Utilizing this approach, we identified insulin growth factor receptor 1 (IGF1R) as a potential target of miR-17-3p. IGF1R imparts an oncogenic approach to the cells by helping cells escape apoptosis, become hypertrophic and increase the production of extracellular proteases that allow cells to detach from neighbors. The regulation of insulin growth factor receptor 1 by human microRNA-17-3p was evaluated using a western blot analysis of prostate cancer cell lines. Protein levels were compared in a cell line that …
Spatial And Temporal Distribution Of Larval Fishes In A Large Tidal River., Harold Seelig
Spatial And Temporal Distribution Of Larval Fishes In A Large Tidal River., Harold Seelig
Theses and Dissertations
There are few published studies of larval fish assemblages from unregulated, tidal freshwater rivers. Patterns in the spatial and temporal distribution of larval fishes in the Mattaponi River were examined. Sampling took place on a weekly basis from February through August, 2006 and 2007. Larval fishes were categorized by taxa, reproductive guild, and residency guild. Group comparisons using multi-response permutation procedures (MRPP) indicated significant spatial and temporal differences in assemblage composition on multiple scales. Differences in assemblage composition were analyzed using non-metric multidimensional scaling (NMS). Interannual differences were attributable to anadromous and semi-migratory species. Seasonal differences were attributable to herrings, …
Family Preservation In Families’ Ecological Systems: Factors That Predict Out-Of-Home Placement And Maltreatment For Service Recipients In Richmond City, Jody Hearn
Theses and Dissertations
Family preservation services are intended to prevent the out-of-home placement (into foster care or some other alternative arrangement) of children and youth in families at risk of maltreating them. An Ecological Systems perspective of these families might suggest that a family’s context (represented by the variables of poverty, agency services, family history, and individual/caretaker characteristics) must be considered as an over-arching influence in families’ risk and outcomes. The purpose of this cross-sectional secondary data analysis study was to identify layered factors that distinguish family preservation cases in Richmond, VA that experience removal or subsequent abuse or neglect from those that …
Tied Together: A Molecular Role For Tie1 In Angiopoietin Tie2 Signaling, Tom Cm Seegar
Tied Together: A Molecular Role For Tie1 In Angiopoietin Tie2 Signaling, Tom Cm Seegar
Theses and Dissertations
The primary function of the vascular system is the maintenance of oxygen homeostasis for all metazoan tissue. Angiogenesis, the remodeling and maintenance of new blood vessels from an existing vessel, is primarily controlled through the endothelial specific receptor tyrosine kinase Tie2, and the orphan receptor tyrosine kinase, Tie1. Although these receptors share highly conserved, genetic and biochemical analysis has shown these receptors have distinct and essential roles in angiogenesis. Tie2 activation typically results in vessel stability and quiescences and has further been shown to interact with all four sub-types of the angiopoietin signaling factors, Ang1-4. Conversely, Tie1 is involved in …
The Mechanism Of Mitochondrial Folate Transport By The Mitochondrial Folate Transporter, Scott Alan Lawrence
The Mechanism Of Mitochondrial Folate Transport By The Mitochondrial Folate Transporter, Scott Alan Lawrence
Theses and Dissertations
The mitochondrial folate transport protein (MFT) functions to transport folates into the mitochondrial matrix. The MFT is a member of a mitochondrial carrier family (MCF) of proteins that have a high degree of sequence and structural similarities, yet they transport vastly different substrates at high specificities. In this dissertation research, the folate-specific transport mechanism of the MFT was explored using experimental and computational techniques. MFT residues that differed from MCF consensus residues in conserved PxD/ExxK/R motifs and at a predicted substrate-binding site common to all MCF proteins were investigated. Site-directed mutagenesis of these anomalous residues in the MFT revealed that …
Insulin-Like Growth Factor Binding Protein-3 (Igfbp-3) Plays An Essential Role In Cellular Senescence: Molecular And Clinical Implications., Amanda Garza
Theses and Dissertations
Normal somatic cells have a limited proliferative capacity in vivo and in vitro, termed senescence and later, thought to contribute to molecular and cellular organismal aging. There are several studies that demonstrate the importance of the GH/IGF axis in longevity, aging and cellular senescence. One primary component of the IGF signaling involves IGFBP-3. It is well documented that IGFBP-3 levels are significantly increased in senescent human diploid fibroblasts however IGFBP-3 function is not known in this system. Interestingly, Werner syndrome fibroblasts, commonly used as a model of cellular aging, have upregulated IGFBP-3 levels in young and late passage cells compared …
Duality Of A Cage, Younseal Eum
Duality Of A Cage, Younseal Eum
Theses and Dissertations
My thesis is about the dualistic connotation of the cage. The original intention of a cage is to create a boundary to enclose a target. However, a cage has a positive intent for protection. With this idea, I created kinetic sculpture and installation pieces referencing cages. While I understand the negative association of cages, I made them seductive through the careful consideration of lightness, fragility, and sheen. I have been exploring forms and material qualities to express the contradictory connotation of cages. Most of my work is made of wire because I have a great interest in the delicate nature …
Expression & Purification Of Recombinant Plasmodium Falciparum Erythrocyte-Binding Ligands, Seward Joann Cofie
Expression & Purification Of Recombinant Plasmodium Falciparum Erythrocyte-Binding Ligands, Seward Joann Cofie
Theses and Dissertations
Plasmodium falciparum, the most virulent malarial parasite, is capable of invading all known human blood types. Erythrocyte invasion depends on specific parasite ligand and erythrocyte receptor interactions. These interactions are mediated by Region II of the P. falciparum erythrocyte binding ligands. Although invasion does not seem dependent upon a singular ligand, their individual contributions to the invasion process are yet to be explained. In this study, Region II of P. falciparum binding ligands BAEBL and JESEBL were transiently expressed as hexahistidyl recombinant proteins in COS-1 cells. Purification by column chromatography yielded 0.52 mg of BAEBL and 0.433 mg of JESEBL. …
You're Gonna Be Ok: A System To Control The Uncontrollable, John Hendershot
You're Gonna Be Ok: A System To Control The Uncontrollable, John Hendershot
Theses and Dissertations
This is a written defense to accompany the MFA Thesis Exhibition You’re Gonna Be Ok, an installation encompassing video, and other sensory components. This defense provides background for the artist’s motivation to make this work, along with a theoretical framework used to construct the installation. Accompanying photos, video, and PowerPoint are also included to give reference and documentation of the installation event.
An Efficient Implementation Of An Exponential Random Number Generator In A Field Programmable Gate Array (Fpga), Smitha Gautham
An Efficient Implementation Of An Exponential Random Number Generator In A Field Programmable Gate Array (Fpga), Smitha Gautham
Theses and Dissertations
Many physical, biological, ecological and behavioral events occur at times and rates that are exponentially distributed. Modeling these systems requires simulators that can accurately generate a large quantity of exponentially distributed random numbers, which is a computationally intensive task. To improve the performance of these simulators, one approach is to move portions of the computationally inefficient simulation tasks from software to custom hardware implemented in Field Programmable Gate Arrays (FPGAs). In this work, we study efficient FPGA implementations of exponentially distributed random number generators to improve simulator performance. Our approach is to generate uniformly distributed random numbers using standard techniques …
The Middle School Transition In Private Schools: Student Perceptions, Eileen Atkinson
The Middle School Transition In Private Schools: Student Perceptions, Eileen Atkinson
Theses and Dissertations
Abstract THE MIDDLE SCHOOL TRANSITION IN PRIVATE SCHOOLS: STUDENT PERCEPTIONS By Eileen Irby Atkinson, Ph.D. A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at Virginia Commonwealth University. Virginia Commonwealth University, 2010 Director: Cheryl Magill, Ph.D., Assistant Professor, Department of Educational Leadership Students transitioning into the middle school often experience difficulty adjusting to their new environment. During this transition, declines in academic motivation, academic achievement, and connectedness have been noted. Most research on this transition has taken place in public school settings. This research investigated the impact of the middle school transition in …
Focal Adhesion Kinase, A Major Regulator Of Oligodendrocyte Morphological Maturation And Myelination, Audrey Lafrenaye
Focal Adhesion Kinase, A Major Regulator Of Oligodendrocyte Morphological Maturation And Myelination, Audrey Lafrenaye
Theses and Dissertations
The formation of the myelin sheath is a crucial step during development because it enables fast and efficient propagation of signals within the limited space of the mammalian central nervous system. During the process of myelination, oligodendrocytes actively interact with the extracellular matrix (ECM). These interactions are considered crucial for proper and timely completion of the myelin sheath. However, the exact regulatory circuits involved in the signaling events that occur between the ECM and oligodendrocytes are currently not fully understood. Therefore, in this dissertation we investigated the role of a known integrator of cell-ECM signaling, namely, focal adhesion kinase (FAK), …
Exploring The Mechanism Of Alginate Acetylation In Pseudomonas Aeruginosa, Janice Paletta
Exploring The Mechanism Of Alginate Acetylation In Pseudomonas Aeruginosa, Janice Paletta
Theses and Dissertations
The opportunistic pathogen P. aeruginosa is the leading cause of morbidity and mortality in cystic fibrosis patients. During chronic infection of the cystic fibrosis lung, P. aeruginosa undergoes conversion to a mucoid phenotype, constitutively producing the exopolysaccharide alginate, composed of the uronic acids D-mannuronate and L-guluronate. This alginate production contributes significantly to virulence in the cystic fibrosis lung. Evidence suggests that the acetylation state of the mannuronate component of the alginate influences the ability of components of the immune system to phagocytose the organism. To garner new and relevant information regarding the mechanism of alginate acetylation in Pseudomonas aeruginosa, a …
Patterns In Fish Community Structure In A Regulated River, Richard Davis
Patterns In Fish Community Structure In A Regulated River, Richard Davis
Theses and Dissertations
I examined the abundance, composition, and distribution of fish communities in the lower Roanoke River, a hydropeaking system in North Carolina. Fishes were sampled at before and after peaking events over three years; 2007 to 2009. I evaluated trends in species richness, diversity, and assemblage composition. There were no significant differences in either richness or diversity suggesting consistent trends in richness and diversity throughout the study. I used non-metric multidimensional scaling (NMDS) to create a community composition model. Fish composition was noticeably greater post-peaking and changed minimally across time and event. There were no statistically significant differences in species composition …
A Survey Of The Usage Of Topical Anesthesia Among Dentist, Lawrence Shults
A Survey Of The Usage Of Topical Anesthesia Among Dentist, Lawrence Shults
Theses and Dissertations
Purpose: The purposes of this study were four-fold: 1) to determine the types and effectiveness of various topical anesthetics being used among dentists currently treating children, 2) to determine the types of procedures for which topical anesthetics are being used among children, 3) to understand the awareness and use of a relatively newer compounded topical gel Oraqix (Dentsply Caulk) among children, 4) to understand the adverse reactions to topical anesthesia that are seen among children. Methods: A cross sectional survey was designed, regarding the type, procedural use, effectiveness, and adverse reactions noted among children to various topical anesthetics. The survey …
Mechanisms Associated With Aging And Age-Related Disease In Drosophila, Melanie Jones
Mechanisms Associated With Aging And Age-Related Disease In Drosophila, Melanie Jones
Theses and Dissertations
Aging is an intrinsic process that is independent of obvious disease. In contrast to normal aging, age-related diseases are conditions that typically manifest at advanced ages, are associated with explicit pathology and cause disability and premature death. We used Drosophila as a model to investigate the molecular-genetic mechanisms associated with aging and age-related disease. Age-related locomotor impairment (ARLI) is a serious condition for the elderly and greatly impacts their quality of life. Toward identifying genes and mechanisms that influence ARLI, we performed a forward genetic screen using Drosophila mutants. This screen identified a loss of function mutant in PDK1, a …
Oral Health Status Of Children In The Child Health Investment Partnership (Chip) Program, Latrice Foster
Oral Health Status Of Children In The Child Health Investment Partnership (Chip) Program, Latrice Foster
Theses and Dissertations
Purpose: The purpose of this study is to describe children’s dental disease status and functional health literacy of families enrolled in the Child Health Investment Partnership program in Roanoke Valley. Methods: This was a prospective cohort study of children (n=166) enrolled in the Child Health Investment Partnership of Roanoke Valley, Virginia (CHIP). The parents of the 166 children completed the Life Skills Progression (LSP) survey at enrollment between September 2004 and September 2008 to assess their functional health literacy levels. Their LSP scores were used to determine their subsequent health care literacy (HCL), personal health literacy (PHL), and dental-child utilization …
Seasonal Patterns Of Nutrient Retention In A Restored Tidal Freshwater Stream Of The Mid-Atlantic Coastal Plain, Joseph Wood
Seasonal Patterns Of Nutrient Retention In A Restored Tidal Freshwater Stream Of The Mid-Atlantic Coastal Plain, Joseph Wood
Theses and Dissertations
Nutrient retention is governed by the interplay between physical processes that control the throughput of water and materials (i.e., water residence time), and by biological processes that govern transformation and uptake (e.g., microbial denitrification). A partial breach of the dam located on Kimages Creek (VA) re-established the historical (pre-1920) connection to the James River and provided a well-defined channel to gauge tidal exchange. We quantified tidal exchange as well as non-tidal (watershed) inputs on a monthly basis to assess Nitrogen (N) retention. Water and N fluxes were dominated by tidal exchange which was typically three times greater than inputs from …
Fabricating Womanhood, Emily Fox
Fabricating Womanhood, Emily Fox
Theses and Dissertations
The exhibit, Fabricating Womanhood, was an attempt to explore the construction of gender and identity. While the artwork addressed well researched and documented feminist themes the artwork also stemmed from personal experiences and my coming-of-age process. The resulting installation included video, prints, painting, ceramics and found objects arranged in a set-like house construction of life-size proportions.
Mineralization Potential Of Electrospun Pdo-Nha-Fibrinogen Scaffolds Intended For Cleft Palate Repair, Isaac Rodriguez
Mineralization Potential Of Electrospun Pdo-Nha-Fibrinogen Scaffolds Intended For Cleft Palate Repair, Isaac Rodriguez
Theses and Dissertations
The overall goal of this study was to identify mineralized scaffolds which can serve as potential alternatives to bone graft substitutes intended for cleft palate repair. The aim of this preliminary study was to evaluate the role of fibrinogen (Fg) and nano-hydroxyapatite (nHA) in enhancing mineralization potential of polydioxanone (PDO) electrospun scaffolds. Scaffolds were fabricated by blending PDO:nHA:Fg in the following weight ratios: 100:0:0, 50:25:25, 50:50:0, 50:0:50, 0:0:100 and 0:50:50. Scaffolds were immersed in different simulated body fluids for 5 and 14 days to induce mineralization. The inclusion of fibrinogen induced sheet-like mineralization while individual fiber mineralization was noticed in …
Characterization Of Adherence, Cytotoxicity And Biofilm Formation By Gardnerella Vaginalis, Jennifer Patterson
Characterization Of Adherence, Cytotoxicity And Biofilm Formation By Gardnerella Vaginalis, Jennifer Patterson
Theses and Dissertations
Worldwide, bacterial vaginosis (BV) is the most common vaginal disorder in women of childbearing age. BV is of major clinical importance due to its ability to significantly affect pregnancy outcome and enhance the transmission and acquisition of HIV. BV is characterized by a dramatic shift in the vaginal microflora; in most BV cases, the predominant bacterial species is Gardnerella vaginalis. It has been demonstrated that G. vaginalis forms an adherent biofilm on the vaginal epithelium of women with BV. Furthemore, evidence suggests that the high rate of recurrence associated with BV is related to incomplete eradication of the biofilm. The …
A Numerical Method For Estimating The Variance Of Age At Maximum Growth Rate In Growth Models, Semhar Ogbagaber
A Numerical Method For Estimating The Variance Of Age At Maximum Growth Rate In Growth Models, Semhar Ogbagaber
Theses and Dissertations
Most studies on maturation and body composition using the Fels Longitudinal data mention peak height velocity (PHV) as an important outcome measure. The PHV is often derived from growth models such as the triple logistic model fitted to the stature (height) data. The age at PHV is sometimes ordinalized to designate an individual as an early, average or late maturer. In theory, age at PHV is the age at which the rate of growth reaches the maximum. Theoretically, for a well behaved growth function, this could be obtained by setting the second derivative of the growth function to zero and …
Fundamental Work Toward An Image Processing-Empowered Dental Intelligent Educational System, Grace Olsen
Fundamental Work Toward An Image Processing-Empowered Dental Intelligent Educational System, Grace Olsen
Theses and Dissertations
Computer-aided education in dental schools is greatly needed in order to reduce the need for human instructors to provide guidance and feedback as students practice dental procedures. A portable computer-aided educational system with advanced digital image processing capabilities would be less expensive than current computer-aided dental educational systems and would also address some of their limitations. This dissertation outlines the development of novel components that would be part of such a system. This research includes the design of a novel image processing technique, the Directed Active Shape Model algorithm, which is used to locate the tooth and drilled preparation from …