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Articles 14131 - 14160 of 19641
Full-Text Articles in Entire DC Network
Strategies To Resolve The Three-Dimensional Structure Of The Genome Of Small Single-Stranded Icosahedral Viruses, Eduardo Sanz Garcia
Strategies To Resolve The Three-Dimensional Structure Of The Genome Of Small Single-Stranded Icosahedral Viruses, Eduardo Sanz Garcia
Theses and Dissertations
The aim of this study is the three-dimensional structural characterization of the genome packaging inside viral capsids via cryo-electron microscopy and three-dimensional reconstruction. The genome of some single-stranded viruses can be densely packaged within their capsid shells. Several stretches of the genome are known to adopt stable secondary structures, however, to date, little is known about the three-dimensional organization of the genome inside their capsid shells. Two techniques have been developed to facilitate the structural elucidation of genome packaging: the asymmetric random-model method, and the symmetry-mismatch, random model method. Both techniques were successfully tested with model and experimental data. The …
Faith Based Environmental Stewardship: Practices And Attitudes Of Christian Churches On Virginia’S Northern Neck And Eastern Shore, Paoula Sehannie
Faith Based Environmental Stewardship: Practices And Attitudes Of Christian Churches On Virginia’S Northern Neck And Eastern Shore, Paoula Sehannie
Theses and Dissertations
In recent years there has been a growing interest in the relationship between religion and the environment. The purpose of this project is to explore the environmental practices and attitudes of Christian churches in two Virginia Communities. The two communities; the Northern Neck and Eastern Shore are located on the Chesapeake Bay and have a shared history of dependence on the Bay. The results of the dissertation demonstrate the prevalence of environmental programs in the population, the nature of these programs and the respondents’ attitudes towards a host of environmental issues. These results can be used by environmental professionals and …
Systemic And Microcirculatory Effects Of Hboc-201: A Hemoglobin-Based Oxygen Carrier, Bjorn Song
Systemic And Microcirculatory Effects Of Hboc-201: A Hemoglobin-Based Oxygen Carrier, Bjorn Song
Theses and Dissertations
Top-loading This study compared the effects on oxygen (O2) transport of four fluids: 5.9% human serum albumin (HSA) a non-O2 carrying iso-oncotic solution (volume control);HBOC-201 (Hemopure, Biopure Corp., Cambridge, MA); MP50, HBOC-201 with a P50 of 18 mmHg; and lastly LP50, an HBOC-201 with P50 of 17 mmHg and higher viscosity (4 cP). It has been proposed that HBOC with a higher O2 affinity and a viscosity closer to that of whole blood will cause less vasoconstriction and thus a lower MAP than Hemopure (P50 = 40 mmHg and 2.2 cP). Intravital microscopic measurements were made on the spinotrapezius muscle …
Costs Of Treating Depression With Individual Versus Family Therapy, Sareta Dobbs Head
Costs Of Treating Depression With Individual Versus Family Therapy, Sareta Dobbs Head
Theses and Dissertations
Marital discord contributes to the development and continuation of depression and to the recurrence of depressive episodes for those in troubled relationships. Early research suggests that family therapy may reduce the severity and frequency of depressive episodes through modification of family interactional patterns. This would result in a reduction in the cost of treating depression. This study summarizes the literature linking family dynamics with depression. Then,using a sample taken from a large health maintenance organization, data was statistically analyzed to measure the effectiveness of both individual and family therapy as delivered by different types of mental health professionals. Results indicated …
Development Of A Rigid Body Computational Model For Investigation Of Wrist Biomechanics, Benjamin Majors
Development Of A Rigid Body Computational Model For Investigation Of Wrist Biomechanics, Benjamin Majors
Theses and Dissertations
The wrist is one of the most complex joints in the human body. As such, the wrist joint is difficult to model due to the number of bones involved and its intricate soft tissue interactions. Many studies have attempted modeling the wrist previously; however, the majority of these studies simplify the joint into two-dimensions or idealized mechanical joints to reduce the complexity of the simulation. While these approaches still yield valuable information, the omission of a third-dimension or geometry defined movements limits the models’ usefulness in predicting joint function under non-idealized conditions. Therefore, the goal of this study was to …
A Reusable Persistence Framework For Replicating Empirical Studies On Data From Open Source Repositories, Scott Bong-Soo Chun
A Reusable Persistence Framework For Replicating Empirical Studies On Data From Open Source Repositories, Scott Bong-Soo Chun
Theses and Dissertations
Empirical research is inexact and error-prone leading researchers to agree that replication of experiments is a necessary step to validating empirical results. Unfortunately, replicating experiments requires substantial investments in manpower and time. These resource requirements can be reduced by incorporating component reuse when building tools for empirical experimentation. Bokeo is an initiative within the Sequoia Lab of the BYU Computer Science Department to develop a platform to assist in the empirical study of software engineering. The i3Persistence Framework is a component of Bokeo which enables researchers to easily build and rapidly deploy tools for empirical experiments by providing an easy-to-use …
Spiritually Strengthening Learning Environments In Higher Education, Seth A. Martinez
Spiritually Strengthening Learning Environments In Higher Education, Seth A. Martinez
Theses and Dissertations
This qualitative thesis brings attention to a phenomenon that is largely neglected in the world of higher education: the faith-intellect relationship. The main purpose of this multiple-case study is to provide a rich description of what a highly spiritually strengthening learning environment in higher education looks and feels like to those participating. In essence, the researcher provides a vicarious experience for the reader. A learning environment that fosters spiritually strengthening experiences for the students is one in which the student-teacher interactions are of high quality and in which the attributes possessed by both the professor and students are manifest through …
Capture And Access Of Multiple Screen Presentations, Kelv H. Cutler
Capture And Access Of Multiple Screen Presentations, Kelv H. Cutler
Theses and Dissertations
Knowledge transferred during meetings is often ephemeral in nature and thus must be captured if it is to be retained. Ideally, a capture solution should be able to 1) accommodate any number of screens without sacrificing image quality and 2) allow dynamic access to a complete media capture while the capture is taking place. Both students and employees can benefit from the information captured during the lectures and meetings for enhanced discussion and afterward for knowledge retention. Current systems do not support multiple screen capture well, and no system supports dynamic access to the active meeting capture during the meeting. …
Gender And Color Specific Differences In Event Related Potentials, Abhishek Trikha
Gender And Color Specific Differences In Event Related Potentials, Abhishek Trikha
Theses and Dissertations
This project analyzed gender and color-specific differences in event-related potentials (ERPs). Previous studies have shown that males process color differently than females. In a recent study, sex differences were found in ERPs during a visual object recognition task. There were higher EEG amplitudes in females (especially P300) than males. Significant sex and color-specific differences have been found in diseases involving altered dopamine (DA) machinery. Thus, we analyzed differences between ERPs in males vs females during a color task. We also compared the color-specific differences in ERPs between males and females. Males and females participated in EEG recording sessions for 2 …
A Study Of Language Attitudes Concerning The De-Affication Of /Tʃ/, The Pronunciation Of The /Tɾ/ Consonant Cluster, And The Use Of The Definite Article With Proper Names In Santiago, Chile, Ian J. Dixon
Theses and Dissertations
This thesis analyzes the linguistic attitudes of natives from Santiago, Chile regarding three linguistic phenomena present in Chilean Spanish of Santiago: the fricative realization of the Spanish /tʃ/, the assibilated realization of /tɾ/ and the use of the definite article before the first names of people. The social factors of age, sex and socioeconomic status are acknowledged as possible factors contributing to the linguistic attitudes of the 64 participants interviewed.
African American Women's Health: An Examination Of Resource Needs, Context, And Public Policy Over The Life Course, Cynthia Newbille
African American Women's Health: An Examination Of Resource Needs, Context, And Public Policy Over The Life Course, Cynthia Newbille
Theses and Dissertations
African American Women's Health: An Examination of Resource Needs, Context, and Public Policy over the Life Course
Chemical Vapor Deposition Of Silanes And Patterning On Silicon, Feng Zhang
Chemical Vapor Deposition Of Silanes And Patterning On Silicon, Feng Zhang
Theses and Dissertations
Self assembled monolayers (SAMs) are widely used for surface modification. Alkylsilane monolayers are one of the most widely deposited and studied SAMs. My work focuses on the preparation, patterning, and application of alkysilane monolayers. 3-aminopropyltriethoxysilane (APTES) is one of the most popular silanes used to make active surfaces for surface modification. To possibly improve the surface physical properties and increase options for processing this material, I prepared and studied a series of amino silane surfaces on silicon/silicon dioxide from APTES and two other related silanes by chemical vapor deposition (CVD). I also explored CVD of 3-mercaptopropyltrimethoxysilane on silicon and quartz. …
Modeling And Testing Of Dna Motion For Nanoinjection, Regis Agenor David
Modeling And Testing Of Dna Motion For Nanoinjection, Regis Agenor David
Theses and Dissertations
A new technique, called nanoinjection, is being developed to insert foreign DNA into a living cell. Such DNA transfection is commonly used to create transgenic organisms vital to the study of genetics, immunology, and many other biological sciences. In nanoinjection, DNA, which has a net negative charge, is electrically attracted to a micromachined lance. The lance then pierces the cell membranes, and the voltage on the lance is reversed, repelling the DNA into the cell. It is shown that DNA motion is strongly correlated to ion transport through a process called electrophoresis. Gel electrophoresis is used to move DNA using …
Nurse Anesthetist's Perceptions Regarding Utilization Of Anesthesia Support Personnel, Mary Ford
Nurse Anesthetist's Perceptions Regarding Utilization Of Anesthesia Support Personnel, Mary Ford
Theses and Dissertations
Anesthesia support personnel (ASP) provide direct support to health care providers administering anesthesia (Certified Registered Nurse Anesthetists [CRNAs] and anesthesiologists). Because these anesthesia providers are caring for a patient whom they cannot legally or ethically leave unattended, ASP are employed to bring them extra supplies or equipment, prepare equipment for the case, maintain and clean equipment, and generally function as directed by the anesthesia provider. Given the limited literature and importance of ASP in maintaining equipment essential to safe practice, it is necessary to describe the population to understand who is functioning in this role to insure that these individuals …
The Effects Of Age And Heterochromatin On Frequencies Of Acquired Chromosomal Aneuploidy In Uncultured Human Leukocytes, Noran Aboalela
The Effects Of Age And Heterochromatin On Frequencies Of Acquired Chromosomal Aneuploidy In Uncultured Human Leukocytes, Noran Aboalela
Theses and Dissertations
While age-related sex chromosomal aneuploidy is a well-characterized phenomenon, the relationship between autosomal loss and age remains unclear. The emergence of the specific and highly sensitive fluorescence in situ hybridization (FISH) technology has enabled investigators to study interphase cells, thereby overcoming problems inherent with the study of metaphase spreads for acquired aneuploidy assessment. Despite all the advantages of this technique, there are some limitations that could be misleading when scoring interphase autosomal aneuploidy. In this study we show that sex chromosomal hypoploidy is correlated with age. By using a twin study design, we evaluated Y chromosome hypoploidy frequencies and found …
An Evaluation Of Cardiorespiratory Responses And Ventilatory Efficiency During Treadmill And Cycling Exercise In Overweight Adolescents, Amanda Scheps
An Evaluation Of Cardiorespiratory Responses And Ventilatory Efficiency During Treadmill And Cycling Exercise In Overweight Adolescents, Amanda Scheps
Theses and Dissertations
The assessment of ventilatory efficiency (VE/VCO2 slope) is increasingly being utilized to complement traditional cardiorespiratory fitness testing during graded exercise. The purpose of this study was to compare cardiorespiratory responses and ventilatory efficiency in obese children during a progressive exercise test to volitional fatigue performed on a treadmill and a cycle ergometer. Fifteen obese male (N=3) and female (N=12) adolescents aged 10 to 18 years were recruited in the study and completed both the treadmill and cycle ergometer trials. Mean age and BMI of the sample was 13.3 years and 38.0 kg/m2, respectively. Maximal oxygen consumption (VO2max) and ventilatory efficiency …
Coupling Sediment Transport And Water Quality Models, Yi Xiong
Coupling Sediment Transport And Water Quality Models, Yi Xiong
Theses and Dissertations
Sediment has profound effects on water quality. Correspondingly, water quality modeling often needs sediment transport modeling. However, simplified descriptive sediment transport was originally employed for water quality modeling, and the linkage between sediment transport models and water quality models is less developed. Therefore, the main purposes of this study were to develop general methods of coupling sediment transport and water quality models and to improve sediment transport modeling for water quality modeling. Linkage of sediment transport and water quality was discussed and a comprehensive sediment transport literature review was conducted. SEDDEER (Sediment Deposition and Erosion), a stand-alone sediment and contaminant …
A Meta-Analysis Of School-Based Childhood Obesity Prevention Programs, Ling Shen Hung
A Meta-Analysis Of School-Based Childhood Obesity Prevention Programs, Ling Shen Hung
Theses and Dissertations
The prevalence rate of childhood obesity has increased rapidly worldwide. The childhood obesity epidemic is associated with many adverse health consequences in children as well as a financial burden for a nation’s economy. A meta-analysis was conducted to investigate the effectiveness of school-based childhood obesity prevention programs in preventing childhood obesity. The objectives of this study were to 1) identify the most effective childhood obesity prevention programs through effect size comparison, and 2) identify important program components that affect the effectiveness of the intervention through subgroup analysis. The Comprehensive Meta-Analysis (CMA) program was used for all statistical analyses. Results of …
Evolution Of The Protein-Coding Genes In The Genomes Of The Mycoplasmatales, Dipaloke Mukherjee
Evolution Of The Protein-Coding Genes In The Genomes Of The Mycoplasmatales, Dipaloke Mukherjee
Theses and Dissertations
The bacterial species belonging to the order Mycoplasmatales have highly truncated genomes, and are thus ideal for studying genome evolution patterns. Fourteen members (twelve species) of this order were selected for study of genome evolution based on gene function and phylogeny. A database was constructed that consisting of the set of genes that are common to all of these species, and these genes were further subdivided based on their functions. A Bayesian phylogenetic tree was also constructed from the 16 S ribosomal DNA sequences from these species and robust clades were identified for testing the influence of selection on gene …
Detection And Characterization Of A Volatile Compound As A Response To Fall Armyworm (Spodoptera Frugiperda) Feeding In Maize (Zea Mays), Whitney Elizabeth Crow Smith
Detection And Characterization Of A Volatile Compound As A Response To Fall Armyworm (Spodoptera Frugiperda) Feeding In Maize (Zea Mays), Whitney Elizabeth Crow Smith
Theses and Dissertations
Maize (Zea mays) is an important agricultural crop frequently targeted by pests that pose a threat to plant development and survival. To deal with this problem, maize generates a wide variety of responses to attack by pests, from activation of woundresponse pathways to the release of volatile compounds. Several maize lines have been developed that show resistance to one common pest, the larvae of the fall armyworm (Spodoptera frugiperda). Analysis of the volatiles released by the resistant and susceptible lines in the presence and absence of the fall armyworm was conducted using SPME coupled to GC/MS. Caryophyllene, a commonly released …
A Space Acquisition Leading Indicator Based On System Interoperation Maturity, Jason T. Shibata
A Space Acquisition Leading Indicator Based On System Interoperation Maturity, Jason T. Shibata
Theses and Dissertations
The Department of Defense‘s space acquisition enterprise has experienced numerous challenges since the advent of space power. Space borne capabilities are needed more than ever, but space acquisition frequently fails to meet its goals. The decades of space acquisition experience form a rich history that can be used to build a leading indicator of success to enable effective program execution. First, the space acquisition areas of greatest concern were determined to be cost, schedule and requirements. These areas are considered as systems composed of the people, processes and products that execute the program. Second, the vital interoperation characteristics, or attributes …
A Comparative Analysis Of Alabama Praxis Ii Examination Scores Between Online And Traditional Graduate Students At An Alabama Institution Of Higher Learning, Winston Donnie Cobb
A Comparative Analysis Of Alabama Praxis Ii Examination Scores Between Online And Traditional Graduate Students At An Alabama Institution Of Higher Learning, Winston Donnie Cobb
Theses and Dissertations
The purpose of this study was to compare the Alabama Praxis II test score outcomes between students who received degrees online versus traditional students at an Alabama regional institution of higher learning. A random sample consisted of 50 online graduate students and 50 on campus graduate students. The following 2 graduate master’s degree programs were selected for this study: the Master’s of Education (M.Ed.) degree in School Counseling and the Master’s of Science in Continuing Education (M.S.C.E.) degree in Guidance Counseling. A summarization of the research questions for this study include the following: Is there a significant difference between online …
Gene Network Inference And Expression Prediction Using Recurrent Neural Networks And Evolutionary Algorithms, Heather Y. Chan
Gene Network Inference And Expression Prediction Using Recurrent Neural Networks And Evolutionary Algorithms, Heather Y. Chan
Theses and Dissertations
We demonstrate the success of recurrent neural networks in gene network inference and expression prediction using a hybrid of particle swarm optimization and differential evolution to overcome the classic obstacle of local minima in training recurrent neural networks. We also provide an improved validation framework for the evaluation of genetic network modeling systems that will result in better generalization and long-term prediction capability. Success in the modeling of gene regulation and prediction of gene expression will lead to more rapid discovery and development of therapeutic medicine, earlier diagnosis and treatment of adverse conditions, and vast advancements in life science research.
Relations Of Depression, Social Support, And Socio-Demographic Factors On Health Behaviors Of Mothers With Premature Infants Hospitalized In A Neonatal Intensive Care Unit (Nicu), Surbhi Kanotra
Theses and Dissertations
The present study examined the relationships of depression, social support, and socio-demographic factors on health behaviors of mothers with preterm infants hospitalized in the neonatal intensive care unit (NICU). In addition, the study also assessed the moderation effect of social support on the relationship between depression and health behaviors. Eighty-nine mothers with hospitalized infants in the central Richmond area participated in the study. Analyses found that mother’s education level and her marital status to be significantly associated with her health behaviors. Mothers with a higher level of education and those who were married, were less likely to smoke and more …
Factors Influencing Macroinvertebrate Diversity And Community Composition In Riverine Freshwater Rock Pools, Chtaura Jackson
Factors Influencing Macroinvertebrate Diversity And Community Composition In Riverine Freshwater Rock Pools, Chtaura Jackson
Theses and Dissertations
I examined a system of 378-riverine rock pools situated along the James River in Richmond, Virginia, to uncover the factors influencing their macroinvertebrate diversity and community composition. I characterized (total = 60) the physical characteristics, water quality, hydrology, and community assemblages in July 2009 for a subset of pools. I examined whether selected environmental factors (pH, nearest neighbor distance, depth, surface area and inundation height) were related to macroinvertebrate diversity and community composition. Species richness and total abundance of all taxa increased with pool pH and surface area. Ordination indicates that nearest neighbor distance (NND) and pH varied significantly among …
Assessment Of Body Armor Design On Physical Performance During Simulated Law Enforcement Activities, David Rashad Close
Assessment Of Body Armor Design On Physical Performance During Simulated Law Enforcement Activities, David Rashad Close
Theses and Dissertations
The objective of this research was to evaluate the impact of current body armor design on physical performance during simulated law enforcement activities. Twenty participants completed three trials of 13 individual activities representative of routine law enforcement activities. Three body armor configurations were evaluated: baseline (i.e., no armor), concealable body armor, and external body armor. Dependent variables included task completion time, heart rate, and center of pressure (COP). Repeated measures ANOVAs were used to test the dependant variables, with Tukey’s HSD post hoc tests used where appropriate. Results showed that the vertical and horizontal components of COP were affected by …
Comparing Detection Methods Of Aflatoxin And Exploring Aflatoxin Decontamination Methods, Rebecca Burgett Singleterry
Comparing Detection Methods Of Aflatoxin And Exploring Aflatoxin Decontamination Methods, Rebecca Burgett Singleterry
Theses and Dissertations
Ethanol fermentation of highly concentrated aflatoxin-contaminated corn (Zea mays) was conducted on a lab scale to determine if aflatoxin concentrated in the distilled ethanol and/or dry distillers grain end-products. Alliquots of fermented mash, distilled ethanol, stillage, and dry distillers grain (DDG) were analyzed via LC-MS/MS and immunoassay detection methods for aflatoxin. Results indicate that aflatoxin does not greatly concentrate during fermentation in the DDGs and is undetectable in distilled ethanol. Addition of binders, MTB-100®, to aflatoxin-contaminated DDGs showed great reduction in aflatoxin concentrations when analyzed via LC-MS/MS. Also, an experiment investigating detoxification of aflatoxin using Clorox® was conducted. Results obtained …
Effects Of Prescribed Fire And Selective Herbicide (Imazapyr) On Biodiversity In Intensively Managed Pine Stands Of Mississippi, Raymond Bruce Iglay
Effects Of Prescribed Fire And Selective Herbicide (Imazapyr) On Biodiversity In Intensively Managed Pine Stands Of Mississippi, Raymond Bruce Iglay
Theses and Dissertations
Prescribed fire and imazapyr are two silviculture tools used to control hardwood midstory competition in intensively managed, mid-rotation pine (Pinus spp.) stands but also may support conservation of biodiversity in the southeastern United States. Therefore, I investigated select measures of biodiversity response, small mammals, reptiles, amphibians, carabid beetles, songbirds, and vegetation communities, to fire and imazapyr treatments in intensively managed, mid-rotation pine stands of east-central Mississippi. I used a randomized complete block design of 6 stands (blocks) with 4, 10- ha treatment plots assigned randomly a treatment of burn only, herbicide only, burn + herbicide, or control. I applied dormant …
Economic Impact Of On-Board Module-Building Cotton Harvesters On Replacement Schedule And Harvest Costs, Matthew Alan Farrell
Economic Impact Of On-Board Module-Building Cotton Harvesters On Replacement Schedule And Harvest Costs, Matthew Alan Farrell
Theses and Dissertations
The purpose of this study is to further understand the economic impact of the new on-board module-building cotton harvesters that both John Deere and Case IH have introduced to the market. This study will examine two different areas, the optimal asset replacement schedule and a machine’s performance rate’s effect on harvest costs due to rainfall loss. Using data collected from Willcut (2008), USDA crop progress reports, and a USDA weather station, models will be used to study the areas in question. The findings are that, the age of the associated assets begin replaced with the conventional harvester and the number …
Decay And Environmental Studies On Southern Pine, Joseph Martin Dahlen
Decay And Environmental Studies On Southern Pine, Joseph Martin Dahlen
Theses and Dissertations
This work focused on decay and dimensional stability of southern pine lumber and environmental issues associated with emissions released during kiln drying of southern pine. In one study decking boards were treated with a 3% resin acid solution to increase the dimensional stability. The boards were placed on a roof and weathered for two years. The increased water repellency reduced moisture gain following summer rainstorms by one-third compared to untreated matched samples, this significantly reduced splitting by half and cupping by one-third. In one study decking boards from matched samples were weathered for two years in the roof setup described …