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Articles 7051 - 7080 of 29591
Full-Text Articles in Entire DC Network
The Effect Of Short And Long-Term Nsaid Administration On Osteotomy Healing In Dogs, Hayley Gallaher
The Effect Of Short And Long-Term Nsaid Administration On Osteotomy Healing In Dogs, Hayley Gallaher
Theses and Dissertations
The ability of NSAIDs to delay bone healing has been long known, although the extent and exact mechanism remains elusive. The present study evaluates the effect of short duration NSAID on bone healing in dogs following experimental tibial osteotomy. Carprofen was administered twice daily for either 0, 2, or 8 weeks following surgery. Bone healing was evaluated radiographically using RUST scoring at 4 and 8 weeks postop. Postmortem, quantitative CT of for bone mineral density analysis, histologic cartilage:callus ratio of the fracture, and biomechanical testing were performed. Biomechanically, stiffness and maximum stress were higher in dogs that received no carprofen …
The Silent Epidemic: Disparities And Obstacles In Obtaining Oral Care, Heather Hicks
The Silent Epidemic: Disparities And Obstacles In Obtaining Oral Care, Heather Hicks
Theses and Dissertations
American’s agree that dental health is important and vital to our overall wellbeing. However, not every American is achieving the same degree of oral health. Obstacles that American’s face include dental health disparities, limited access to affordable dental care, and limited access to dental insurance. This study examined how disease risk is shaped within the culture of oral health in Florida. This study examined those who provide dental care, those who cannot afford dental health insurance but earn too much money to qualify for Medicaid, and those with dental insurance. Hypotheses two and three were proven to be true, while …
Purification And Characterization Of Copr, A Copper(Ii) Dependent Transcription Factor, Prakash Khanal
Purification And Characterization Of Copr, A Copper(Ii) Dependent Transcription Factor, Prakash Khanal
Theses and Dissertations
Transcription factors (TFs) are proteins that respond to a specific chemical signal and bind to DNA. In some bacteria, TFs control transition metal ion homeostasis by specifically binding with a particular metal ion or ions and then interacting with DNA. Although most first row metal ions are required as micronutrients for life, many of them can cause cellular damage or death if their concentrations are too high; this makes these TFs and their biological interactions excellent targets for drug development. The bacteria, Streptococcus pneumoniae is a pathogenic microorganism responsible for a range of diseases that target the young and the …
Purification And Preliminary Characterization Of Zinc(Ii) Dependent Transcription Factor Adcr, Asm Saem
Purification And Preliminary Characterization Of Zinc(Ii) Dependent Transcription Factor Adcr, Asm Saem
Theses and Dissertations
Transition metals are essential micronutrients for organisms. Excess zinc can be lethal to bacterial survival. Zinc homeostasis is crucial and is regulated by zinc uptake and efflux system. Streptococcus pneumoniae AdcR (Adhesin competence regulator) transcription factor is the member of MarR (multiple antibiotic resistance regulator) family proteins that suppress the zinc upregulation transporter. In the absence of zinc, AdcR has less affinity to bind DNA and uptake genes are expressed in order to transport zinc inside the cell. Streptococcus pneumoniae is a gram-positive human pathogen that is capable of colonizing in the human nasopharynx, especially in young children and leads …
Remote Sensing Of Colored Dissolved Organic Matter Using Unmanned Aerial Systems And Assessment Of The Influence Of Dissolved Organic Matter On The Oyster Reefs In The Western Mississippi Sound, Sudeera Wickramarathna Galapita Pallayapelage
Remote Sensing Of Colored Dissolved Organic Matter Using Unmanned Aerial Systems And Assessment Of The Influence Of Dissolved Organic Matter On The Oyster Reefs In The Western Mississippi Sound, Sudeera Wickramarathna Galapita Pallayapelage
Theses and Dissertations
Oyster reefs in the western Mississippi Sound (WMS) are dependent on the salinity moderation by freshwater input. However, freshwater brings in high amount of pollutants, which affect the oysters negatively. Oyster diebacks happened as a result of hypoxia caused by excessive organic matter input to WMS in summer 2017. Colored dissolved organic matter (CDOM) is widely used as a proxy for determining organic matter distribution. In this study, hyperspectral and multispectral remote sensing data collected using unmanned aerial systems and in situ CDOM data were used to develop algorithms in order to retrieve CDOM remotely. Collected physical and biogeochemical parameters …
Ruthenium(Ii) Arene Complexes For Asymmetric Catalysis, Zhenyu Zhu
Ruthenium(Ii) Arene Complexes For Asymmetric Catalysis, Zhenyu Zhu
Theses and Dissertations
Within the last few years, a significant contribution to the discovery of sp2C−H activation processes and useful applications for cross-coupling C−C bond formation has been achieved by the use of ruthenium(II) arene catalysts. The aim of this thesis is to describe a modular approach for the synthesis of several ruthenium(II) arene complexes with the potential for C−H activation. Another cutting-edge field, catalytic enantioselective functionalization of C−H bonds by transitional metal catalysts, has also been realized within the last few years. It represents a highly atom- and step-economic approach toward the generation of structural complexity. However, the majority of current methodologies …
Secondary Agricultural Teacher Self-Efficacy In Agribusiness And The Relationship To Collegiate Course Work, William Michael Vestal
Secondary Agricultural Teacher Self-Efficacy In Agribusiness And The Relationship To Collegiate Course Work, William Michael Vestal
Theses and Dissertations
A study was conducted to determine the relationship between agribusiness self-efficacy and business related collegiate courses. One hundred eleven (N = 111) Mississippi and Tennessee secondary agricultural education teachers completed a researcher developed survey that measured agribusiness self-efficacy using 88 competencies from Mississippi and Tennessee secondary agribusiness courses. Participants rated their confidence to teach each competency using a 5 point scale with 1 as no confidence and 5 as very confident. The survey also assessed the types and number of collegiate-level business related courses completed by the participants as well as other demographic factors. Multiple linear regression, ANOVA, and Spearman's …
Novel Methods For Detecting Glycan Receptors For Influenza A Virus And Exploration Of The Function Of The Sialyltransferases On Influenza Viral Infection, Kaijun Jiang
Theses and Dissertations
Sialic acids (Sias) are receptors for influenza A viruses (IAVs). The influence of individual sialyltransferases on the Sias expressed is not understood. Also, sensitive methods to distinguish Sias on the cells are lacking. Our goals were to establish a method to detect Sias on the cell and to evaluate the importance of CMP-sialic acid transporter (SLC35A1) and ST6 beta-galactoside alpha-2,6-sialyltransferase 1 (ST6GAL1) for IAV infection. Aproximity ligation assay was established to detect and quantify Sias.
Development Of Recombinant Staphylococcal Cytotoxins And Superantigens As Vaccine Candidates Against Bovine Mastitis Caused By Staphylococcus Aureus, Sunghyun Yoon
Theses and Dissertations
Bovine mastitis is a significant disease affecting the dairy industry worldwide. The most frequently causative agent of contagious bovine mastitis is Staphylococcus aureus that produces numerous virulence factors contributing to its pathogenesis. However, it is not clearly defined which virulence factors play a critical role in bovine mastitis due to the heterogeneous virulence factor profiles in S. aureus isolated from different hosts and disease types. Among many virulence factors, it has long been postulated that staphylococcal cytotoxins and superantigens (SAgs) play an important role in the pathogenesis of S. aureus in bovine mastitis due to their potent toxicity toward host …
Discovery Of Antifungal Metabolites In Maize Cob Via Liquid Chromatography-Mass Spectrometry, Jeremy Ray Winders
Discovery Of Antifungal Metabolites In Maize Cob Via Liquid Chromatography-Mass Spectrometry, Jeremy Ray Winders
Theses and Dissertations
Maize (Zea mays L.) is a global food staple and is at risk from infection by the pathogenic fungus Aspergillus flavus L. The ubiquitous, soil-borne fungus causes ear rot of maize and produces the carcinogenic secondary metabolite known as aflatoxin. Aflatoxin B1 is the most potent carcinogenic mycotoxin known, causing hepatocellular carcinoma, along with many other serious health problems such as immunosuppression. Previous studies have shown that maize cob tissue plays an essential role in both facilitating and limiting the spread of the fungal pathogen A. flavus, however, little attention in the literature has been given to the cob. To …
Distribution And Spread Mechanisms Of Chinese Tallow (Triadica Sebifera) At Multiple Spatial Scales Within Forests In The Southeastern United States, Shaoyang Yang
Theses and Dissertations
The coastal plain of the southeastern United States is historically wet pine savannahs, prairie, and hardwoods. However, many exotic species have invaded this area and become a serious threat to native forest ecosystems. Among those exotic species, Chinese tallow (Triadica sebifera) has become one of the most pervasive tree species in the southern coastal states, including Alabama, Mississippi, Louisiana, and Texas. Therefore, to understand the distribution and spread mechanisms has become important in the management and control of Chinese tallow in the southeastern United States. In this research, distribution and spread mechanisms of Chinese tallow were studied at multiple spatial …
Landscape Performance Of Callistemon Citrinus Under Environmental Stress Conditions, Riyadh Mannaa Mohsin
Landscape Performance Of Callistemon Citrinus Under Environmental Stress Conditions, Riyadh Mannaa Mohsin
Theses and Dissertations
Woody ornamental plants are considered the key for well- designed landscapes; Callistemon citrinus is one of those plants. In arid and semiarid areas, Callistemon has been used in gardens and landscapes for its unique characteristics. This study was conducted to evaluate the performance of Callistemon in landscapes under different environmental stress conditions including water, and heat. Further, the potential of using 3D software SketchUp in landscape design was also investigated. Callistemon plants were grown under 100, 50 or 30% of field capacity with or without shredded hardwood mulch. When field capacity decreased, root: shoot ratio and water use efficiency were …
Municipal And Agricultural Wastewater Remediation Using Modified Biochars, Glenn Crisler Ii
Municipal And Agricultural Wastewater Remediation Using Modified Biochars, Glenn Crisler Ii
Theses and Dissertations
Water contaminated by heavy metals and plant nutrients pose a threat to human health and safety as well as the environment. The aim of this body of work is to develop, characterize, and understand the adsorption properties of green sorbents to mitigate these risks. Biochar, an adsorbent known to be both environmentally friendly and inexpensive was used. Advantages of biochar are its high surface area, easy modification, and native surface functionality. Biochars used in this study are of pecan shell or douglas fir origin, although biochar can be made from a host of waste organic materials. Pecan shell biochar was …
Early Retention In Rural Schools: Alternate Route Teachers' Perspectives, Autumn K. Jordon
Early Retention In Rural Schools: Alternate Route Teachers' Perspectives, Autumn K. Jordon
Theses and Dissertations
The purpose of this qualitative study was to examine teachers' perspectives of the key factors contributing to the retention of rural teachers who entered teaching through an alternate route certification program in Mississippi. It was specifically the goal of this study to understand how alternatively certified teachers perceive their own characteristics (e.g., teacher preparation, personal experiences), school conditions (e.g., students, administration), and compensation (e.g., salary, benefits) to be related to their decision to remain in the profession. In this study, 9 rural alternate route teachers were interviewed from 8 schools in Mississippi. The research questions were: (1) How do rural …
Effect Of Occidiofungin On Morphogenic Transformation Of Candida Albicans, Rabina Kumpakha
Effect Of Occidiofungin On Morphogenic Transformation Of Candida Albicans, Rabina Kumpakha
Theses and Dissertations
Candida albicans is a polymorphic fungus that can grow as yeast (Y) and hypha (H). The Y-H morphological switching is controlled through the MAPK, Cek1p. With the prior work showing that occidiofungin prevents C. albicans from forming hypha when added at the time of Y-H switching, we aim to identify the impact of occidiofungin on signaling events associated with morphological switching specifically looking at Cek1 MAPK cascade. Results from this work have demonstrated that Cek1 MAPK is not required for occidiofungin bioactivity. Further, we report that morphologically switching cells are more sensitive to occidiofungin than their non-switching counterparts. Moreover, later …
Estimating Recreational Value Of Water Quality In Mississippi Lakes When Water Quality Data Are Scarce, Caroline Kelsoe
Estimating Recreational Value Of Water Quality In Mississippi Lakes When Water Quality Data Are Scarce, Caroline Kelsoe
Theses and Dissertations
In its 2012 National Lakes Assessment, the EPA determined that nutrients are the most widespread stressor of US Lakes, with one-third of US lakes containing excess nitrogen and/or phosphorus. In response, states are developing numeric nutrient criteria to regulate the allowable amount of nutrients in surface waterbodies. In this study, we estimate the recreational value of improved water quality as a result of reduced nutrients in Mississippi lakes using a travel cost model. A major challenge, however, is the lack of water quality data for many Mississippi lakes. We introduce a water quality prediction model to impute water quality measures …
Evaluation Of Cobb Mv × Cobb 500 Broiler Response To Various Nutrient Regimens To Maximize Performance And Economics, Rosana Hirai
Evaluation Of Cobb Mv × Cobb 500 Broiler Response To Various Nutrient Regimens To Maximize Performance And Economics, Rosana Hirai
Theses and Dissertations
To maximize the economics of a new commercial broiler cross, research on its nutritional specifications is necessary. Study 1 investigated the effects of feeding four amino acid densities (AAD) on performance and yield of Cobb MV × Cobb 500 broilers at d 33 and 36. Data demonstrated a stepwise decrease in feed conversion ratio (FCR) as AAD level increased. Improvements in performance, processing, and economic return were observed when feeding higher AAD levels. Study 2 estimated the digestible lysine (dLys) requirements of Cobb MV × Cobb 500 broilers from d 0-14 and evaluated the impact of varying starter dLys levels …
Agricultural Educators’ Personal Characteristics And Self-Efficacy Beliefs Regarding Stem Education, Rachel Hendrix
Agricultural Educators’ Personal Characteristics And Self-Efficacy Beliefs Regarding Stem Education, Rachel Hendrix
Theses and Dissertations
STEM (Science, Technology, Engineering, and Mathematics) education is becoming an integral part of modern agricultural education. If the integration of STEM into agricultural education is to succeed, it is vital that educators feel confident in their ability to teach such material. This study examines Tennessee and Mississippi agricultural educators’ personal teaching efficacy and outcome expectancy levels towards STEM subjects and identifies factors that may play a role in the development of STEM teaching efficacy. Analysis indicated that educators felt most confident in their ability to teach science, followed by technology, mathematics and then engineering. Factors that influenced STEM personal teaching …
An Examination Of Impaired Driving: The Integral Role Of Cognitive And Behavioral Predictors, Andrew Tatch
An Examination Of Impaired Driving: The Integral Role Of Cognitive And Behavioral Predictors, Andrew Tatch
Theses and Dissertations
Despite modest reductions over previous decades, improvements in impaired driving prevalence have stalled at problematic levels in recent years. Recent self-report data indicate that 20 percent of driving age individuals acknowledge operating a vehicle within two hours of alcohol consumption within the previous year and there are approximately 121 million episodes of impaired driving annually. Extant research has consistently identified specific subgroups, including men, young adults, and individuals with less education, as being high risk for driving under the influence. Additionally, researchers of impaired driving have discerned certain impaired driving-related attitudes and behaviors as important predictors of impaired driving. Despite …
Aziridinations In Aqueous Solutions Using Dna Templating; Towards Sustainable Asymmetric Catalysis, Sydnee Elmore
Aziridinations In Aqueous Solutions Using Dna Templating; Towards Sustainable Asymmetric Catalysis, Sydnee Elmore
Theses and Dissertations
Modern organic synthesis typically centers around the use of expensive, complex, homogeneous catalyst systems in organic solvents which often generate copious amounts of hazardous waste. Therefore, the development of water-tolerant catalysts capable of performing reactions in aqueous solutions has become a growing area of scientific inquiry. To this end, we have designed and optimized a water-stable catalyst (Mn[TMPyP4]I5) capable of generating aziridines from olefins in aqueous solutions. Aziridines are valuable synthetic building blocks that have been used to generate various biologically active compounds, though synthetic techniques for aziridine synthesis are not well-established. Our ultimate goal was developing a catalytic system, …
Analysis Of Defense Signaling Pathway Genes Associated With Fungal Resistance To Aspergillus Flavus And Aflatoxin Accumulation In Corn, Felicia Marie Parish
Analysis Of Defense Signaling Pathway Genes Associated With Fungal Resistance To Aspergillus Flavus And Aflatoxin Accumulation In Corn, Felicia Marie Parish
Theses and Dissertations
Aspergillus flavus exemplifies a pathogenic fungus that remains a significant contributor to the loss of corn (Zea mays) crops. The production of carcinogenic aflatoxins renders the crop hazardous for consumption and causes significant loss to farmers. Therefore, the prevention of A. flavus contamination continues to persist as a topic for research intervention. Host resistance to this pathogen provides a promising source of defense for the corn plant. Corn inbred line Mp313E was previously identified to exhibit significant resistance against the A. flavus fungal infection and aflatoxin contamination. Quantitative trait loci (QTL) mapping has previously established four major QTL locations associated …
Application Of Raman And Fluorescence Spectroscopy To Detect Changes In The Chemical Profile Of Water Subject To Polarization, Vegetation Under Stress, And Murine Blood Components, Supriya Nagpal
Theses and Dissertations
This thesis broadly describes the construction of two kinds of spectroscopic set-ups to analyze properties of various materials. In the first part, construction of a Raman spectrometer and a high-throughput in-vivo detection for early plant abiotic stress responses is described. Following which, the set-up is modified into a microscope employed to study Murine blood components with samples varying in age. Initial Raman set-up is also improvised using a polarizer in order to gain deeper understanding of the vibrational and rotational bonds in water. The second part of the thesis explains the construction of a laser-induced fluorescence (LIF) sensor module. Performance …
Varietal And Residual Soil Test K Level Effects On Soybean Leaf K Status And Yield, Andrew Dygert
Varietal And Residual Soil Test K Level Effects On Soybean Leaf K Status And Yield, Andrew Dygert
Theses and Dissertations
Newer multi-trait soybean varieties have resulted in greater yields, bringing into question whether current soil test K (STK) correlation, calibration, and recommendations need updating to maximize yield. The objective of this study was to refine soil test correlation and calibration using a range in residual STK levels and response in temporal leaf and seed K concentrations and yield across soybean maturity groups IV and V. For the 0- to 15-cm soil depth STK levels greater than 125 mg K kg-1, K did not limit yield. Critical tissue K varied between years and maturity group. Critical K at R1, R3, and …
Improved Land Use And Land Cover Classification And Determination Of The Influence Of Land Use And Land Cover On The Water Quality In An Agriculture Dominated Watershed, Scott Landon Sanders
Improved Land Use And Land Cover Classification And Determination Of The Influence Of Land Use And Land Cover On The Water Quality In An Agriculture Dominated Watershed, Scott Landon Sanders
Theses and Dissertations
Classification of remotely sensed imagery for reliable land use and land cover (LULC) change information remains a challenge in areas where spectrally similar LULC features occur. Dissolved organic matter (DOM) influences the biogeochemistry of aquatic environments and its quantity and quality are due, in large part, to the surrounding LULC. Thus, objectives were to improve the accuracy of LULC classification and quantify seasonal variations of water quality in a watershed dominated by agriculture and determine the controls for the variations in water quality. Support vector machine classification scheme with post classification correction yielded highest accuracy for LULC classifications and four …
Investigating The Impact Of Stereotype Threat On Undergraduate Engineering Students, Carla Grimes
Investigating The Impact Of Stereotype Threat On Undergraduate Engineering Students, Carla Grimes
Theses and Dissertations
The purpose of this dissertation is to explore how stereotype threat impacts women and minorities within the College of Engineering. Within this study, I present a mixed-methods study that begins with an exploratory qualitative study into an sequential explanatory study. The purpose of the first study, Manuscript 1, was to identify common barriers present to women in engineering that negatively impact their motivations within engineering. During the analysis of this data, stereotype threat emerged as a common theme which lead to a literature review and subsequent explanatory study. A quantitative study, using Picho and Brown’s Social Identities and Attitudes Scale, …
Longitudinal Evaluation Of Habitat Use And Foraging Ecology Of Piscivorous Avian Species Wintering In The Mississippi Delta, Paul Burr
Theses and Dissertations
Piscivorous avian species are of particular importance in Mississippi due to their depredation of cultured catfish throughout the states aquaculture industry. The three most common of these species include the double-crested cormorant (Phalacrocorax auritus), great blue heron (Ardea herodias), and great egret (Ardea alba). Information on these species aquaculture use can aid in effective and ethical management while also providing insight into their foraging ecology and habitat use, which is particularly important given these species augment their nutritional requirements using man-made food sources. The objectives of this research were to explore numerous aspects of avian foraging ecology in relation to …
Monocot And Dicot Weed Control With Mixtures Of Quizalofop And Florpyrauxifen-Benzyl In The Provisia(Tm) Rice System, Tameka Lashea Sanders
Monocot And Dicot Weed Control With Mixtures Of Quizalofop And Florpyrauxifen-Benzyl In The Provisia(Tm) Rice System, Tameka Lashea Sanders
Theses and Dissertations
Quizalofop and florpyrauxifen-benzyl are both new herbicides for rice in the midsouthern U.S. Quizalofop is only effective for control of monocot weed species; therefore, mixtures of florpyrauxifen-benzyl with quizalofop could be beneficial in acetyl CoA carboxylase (ACCase)-resistant rice. Field experiments were conducted at the Delta Research and Extension Center in Stoneville, MS, in 2017 and 2018 to evaluate control of monocot and dicot weed species with sequential applications of quizalofop including auxinic herbicides in the first or second treatment. Other field experiments in 2017 and 2018 evaluated sequential applications of different rates of quizalofop with florpyrauxifen-benzyl included in treatments immediately …
Geospatial Analyses Of Groundwater Depletion And Contamination: Multiscale - Global, Regional And Local Analyses, Aynaz Lotfata
Geospatial Analyses Of Groundwater Depletion And Contamination: Multiscale - Global, Regional And Local Analyses, Aynaz Lotfata
Theses and Dissertations
The overarching objective of this dissertation was to study groundwater resources on global, local, and regional scales. The first objective of this dissertation was to analyze the groundwater nitrate contamination in the Edwards-Trinity and the Southern High-Plains aquifers of Texas. The second was to study groundwater quality in terms of seawater intrusion in the California Coastal Basin, Upper Floridian, and North Atlantic Coastal Plain aquifers. This dissertation also provided a comprehensive overview of the groundwater level in basins at the global scale and further analyzed agricultural activities on groundwater storage in small and large basins. To achieve first objective, Ordinary …
Identification Of Protein Biomarkers For Differentiating Listeria Monocytogenes Genetic Lineage Iii, Basant Gomaa
Identification Of Protein Biomarkers For Differentiating Listeria Monocytogenes Genetic Lineage Iii, Basant Gomaa
Theses and Dissertations
Listeriamonocytogenes causes listeriosis and is one of the most virulent foodborne pathogens. Different subtyping techniques classified L. monocytogenes into four genetic lineages(I, II,III and IV)and seventeen serotypes. Most outbreaks of listeriosis are caused by lineage I. Lineage II is mostly associated with sporadic listeriosis, while Lineage III strains are typically lower risk for causing listeriosis. Listeriosis mainly affectselderly, immunosuppressed, children,andpregnant women causing fetal death, miscarriage, meningitis, encephalitis, and septicemia. Therefore, it is important to differentiate high-risk strains from low-risk strains, which will permit early and appropriate interventions. Our main goal in this current work is to detect candidate biomarkers unique …
Impact Of Early Season Insect Management Decisions On Yield Of Soybean, John Hartley North
Impact Of Early Season Insect Management Decisions On Yield Of Soybean, John Hartley North
Theses and Dissertations
To determine the optimal seeding rate and utilization of seed treatment combinations for maximizing soybean yield within optimal and late planting dates. Also, experiments were conducted to quantify effects of soybean stand loss and to determine optimal seeding rates at various planting dates comparing three seed treatments. Experiments were conducted to test influence of planter type and seeding rate on soybean. Soybean seed treated with at planting insecticides showed no difference in yield compared to fungicide only treated seed. Also, yields were maximized at low seeding rates where no stand loss occurred. Soybean yields benefited from where seeding rates were …