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Mass Spectrometry Based Proteomics And Lipidomics Studies, Huan Kang Oct 2015

Mass Spectrometry Based Proteomics And Lipidomics Studies, Huan Kang

Theses and Dissertations

Mass spectrometry has emerged as having a vital role in various applications to biochemical fields. In this thesis, we have utilized a variety of mass spectrometry techniques for both bacteriophage proteomics and colostrum and milk lipidomics studies. Our first study was the proteome characterization of Great Salt Lake bacteriophage NS01 with SDS-PAGE GEL to separate the viral proteins and high performance liquid chromatography (HPLC) coupled with an LTQ Orbitrap to identify the proteins after in-gel digestion. In this project, we have successfully identified 11 proteins with high confidence, p-values < 0.01, including coat protein gp88 with a coverage of 91% and tail protein gp86 with a coverage of 40.96%, which facilitated the classification of NS01 as a T7-like phage. Our second study was the discovery of colostrum and milk biomarkers that can be used to predict the likelihood of development of production-related metabolic diseases (PRMDs) in dairy cows through a lipidomics approach. In this study, an electrospray ionization, time-of-flight mass spectrometer was applied to lipid profiling, quantification and significant biomolecule selection. A Q-Star quadrupole, orthogonal time-of-flight mass spectrometer and an Agilent 6530 accurate-mass quadrupole/time-of flight mass spectrometer were both used for lipid biomarker fragmentation and identification. According to linear discriminative statistical modeling, three panels of biomarkers were defined. A combination of 2 milk lipid predictors, including DG18:0/18:0 and TG 18:0/18:0/18:1, provided PRMD predictions with 75.0% sensitivity at 90.0% specificity. A combination of 3 colostrum lipid predictors, including TG16:0/18:1/18:3, DG16:0/16:0 and C40H60NO, provided PRMD prediction with 90.0% sensitivity at …

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Design And Validation Of A Complex Loading Whole Spinal Segment Bioreactor, Amanda Marie Beatty Oct 2015

Design And Validation Of A Complex Loading Whole Spinal Segment Bioreactor, Amanda Marie Beatty

Theses and Dissertations

Intervertebral disc (IVD) degeneration is a prevalent health problem that is highly linked to back pain. To understand the disease and tissue response to therapies, ex-vivo whole IVD organ culture systems have recently been introduced. The goal of this study was to develop and validate a whole spinal segment culturing system that loads the disc in complex loading similar to the in-vivo condition, while preserving the adjacent endplates and vertebral bodies. The complex loading applied to the spinal segment was achieved with three pneumatic cylinders. The pneumatic cylinders were rigidly attached to two triangular alumni plates at each corner, comprising …

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The Process Of Monitoring And Evaluation Of The Egyptian Social Pension Program (Al-Daman Al-Igtimaay): An Assessment, Soha Soliman Oct 2015

The Process Of Monitoring And Evaluation Of The Egyptian Social Pension Program (Al-Daman Al-Igtimaay): An Assessment, Soha Soliman

Theses and Dissertations

This study focuses on one of the oldest social protection programs in Egypt, the social pension program (Al Daman Al-Igtimaay), implemented by the Egyptian Ministry of Social Solidarity (MoSS). It attempts to assess and analyze the extent of available monitoring and evaluation (M&E) processes in the social pension program applications and in some of Egypt’s relatively poorest governorates, Assiut and Qena. The main findings include the presence of baseline data on the families, some poverty indicators, and the presence of certain elements of monitoring and reporting. However, there’s a lack of key performance indicators, long and interim goals and targets, …

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Evaluation, Coordination And Execution: An Analysis Of Military Coup Agency At Instances Of Successful Coup D’État, Karim El-Baz Oct 2015

Evaluation, Coordination And Execution: An Analysis Of Military Coup Agency At Instances Of Successful Coup D’État, Karim El-Baz

Theses and Dissertations

Theoretically, members of the ground forces are the normal coup plotters as they have sufficient training and equipment to accomplish the objectives of a successful coup. Henceforth, what is quite puzzling is mixed coups. These coups include other officers from other service branches; taking into account, the ability of ground forces to execute the coup without the interference of other service branches. Therefore, the question is why would the coup leader involve those whom he would not tactically need for the coups’ execution. This is only one side of the puzzle that asks why and how a mixed coup agency …

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Childhood Feeding Practices And Parenting Styles In Hispanics, Kasi Spinelli Sep 2015

Childhood Feeding Practices And Parenting Styles In Hispanics, Kasi Spinelli

Theses and Dissertations

The purpose of this study was to detect an ethnic difference in Hispanic and feeding practices in early childhood. It is further hypothesized that there will be a relationship between parenting styles and feeding practices. 24 Rowan graduate students completed a survey, the Toddler Feeding questionnaire by Chaidez & Kaiser (2011). The items on the survey were divided into questions that asked about parenting styles, feeding practices, environmental factors, and demographics. The ethnicity was analyzed by using a one-way ANOVA (within) to discover any associations between the parenting styles and feeding practices items on the survey. There was not a …

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Novel Selected Hetero-Atom Doped Carbon From Renewable Resource Materials For Fuel Cell And Supercapacitor Applications, Sunil Kumar Ramasahayam Sep 2015

Novel Selected Hetero-Atom Doped Carbon From Renewable Resource Materials For Fuel Cell And Supercapacitor Applications, Sunil Kumar Ramasahayam

Theses and Dissertations

Doped carbon materials have gained a lot of attention recently due to their wide array of applications, for example, in dye degradation, energy conversion and storage, electrocatalysis, sensors and electronics. These doped carbon materials are claimed to have a tremendous potential to substitute expensive metal based electrocatalysts in fuel cell and supercapacitor applications. A recently established microwave assisted technique, which does not make use of any inert or reducing gas during the synthesis, was utilized to synthesize doped carbon materials. The method is simple, rapid, economical and high yielding. Renewable resource materials like tannin, spent coffee grounds and thiamine were …

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Factors Influencing Honey Bee Abundance Across Agricultural Landscapes In The Midsouth, Daniel Adam Whalen Aug 2015

Factors Influencing Honey Bee Abundance Across Agricultural Landscapes In The Midsouth, Daniel Adam Whalen

Theses and Dissertations

Populations of honey bees have declined worldwide in recent years. One suspected cause is the widespread use of pesticides in agriculture. Experiments were conducted to examine potential exposure routes of pesticides to honey bees in the Midsouth. Neonicotinoid seed treatment compounds were studied to determine the rate at which they drift during planting and the rate at which they diminish in crop tissue during crop development. Honey bee foraging activity in Midsouth crops was observed to determine when and at what densities foraging honey bees could be active during pesticide applications. This project was designed to aid in understanding the …

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A Study Of Electronic Service Quality On Fitness Firms: A Customer Perspective, Sivas Vivekanandan Aug 2015

A Study Of Electronic Service Quality On Fitness Firms: A Customer Perspective, Sivas Vivekanandan

Theses and Dissertations

Electronic service quality (ESQ) and customer orientation (CO) have become key tools to succeed in the competitive marketplace. Thus, the purpose of this research was to study how CO as perceived by the customers impacts their perception about the firm’s ESQ and to study the impact of this perceived ESQ on the outcomes at the customer level. There has been minimal research conducted on the components of ESQ in the fitness industry. Therefore, this research was focused on fitness firms wherein the participants for this study were the everyday gym goers. A quantitative survey was conducted in order to collect …

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A Functional Genomics Analysis Of Glycine Max Vesicle Membrane Fusion Genes In Relation To Infection By Heterodera Glycine, Keshav Sharma Aug 2015

A Functional Genomics Analysis Of Glycine Max Vesicle Membrane Fusion Genes In Relation To Infection By Heterodera Glycine, Keshav Sharma

Theses and Dissertations

Soybean cyst nematode (SCN), a major pathogen of soybean worldwide, causes huge losses in soybean production. Various approaches including cloning of genes to combat this devastating disease help to better understand the cellular function and immune responses of plants. Membrane fusion genes are the important regulatory parts of vesicular transport system, which works through packaging of intracellular compounds and delivering them to apoplast or nematode feeding sites to induce an incompatible reaction. The incompatible nature of membrane fusion proteins such as SNAP25, Munc18, Syntaxin, Synaptobrevin, NSF, Synaptotagmin and alpha-SNAP are conserved in eukaryotes and regulate the intracellular function to combat …

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Allelopathy In The Non-Native Macrophyte, Myriophyllum Spicatum And Its Influence On Trophic Dynamics In Aquatic Systems, Daniel J. Sullivan Aug 2015

Allelopathy In The Non-Native Macrophyte, Myriophyllum Spicatum And Its Influence On Trophic Dynamics In Aquatic Systems, Daniel J. Sullivan

Theses and Dissertations

Non-native macrophytes structurally impact aquatic assemblages, yet little is known regarding how they influence energy pathways in freshwater ecosystems. Allelopathy in Eurasian watermilfoil- Myriophyllum spicatum has been shown to target basal epiphytic organisms resulting in differences in assemblage structure of colonizing epiphyton between M. spicatum and native M. sibiricum. I conducted a growth chamber experiment to investigate the hypothesis that differences in assemblage structure of colonizing epiphyton between these two macrophytes influence trophic dynamics within aquatic systems. My data suggest M. spicatum produces higher concentrations of allelochemicals, resulting in a more diverse epiphytic assemblage compared to M. sibiricum. This could …

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Characterization Of Lipoxygenase (Lox) Gene Family And Snp Validation In Relation To Aflatoxin Resistance In Maize (Zea Mays L.), Oluwaseun Felix Ogunola Aug 2015

Characterization Of Lipoxygenase (Lox) Gene Family And Snp Validation In Relation To Aflatoxin Resistance In Maize (Zea Mays L.), Oluwaseun Felix Ogunola

Theses and Dissertations

An efficient approach to combat the accumulation of aflatoxin is the development of germplasm resistant to infection and spread of A. flavus in maize, one of the most important cereal grains in the world. Lipoxygenases (LOXs) are a group enzymes that catalyze oxygenation of polyunsaturated fatty acids (PUFAs). LOX derived oxilipins play critical roles in plant defense against pathogens such as A. flavus. The objectives of this study were to report sequence diversity and expression patterns for all LOX genes, and map their effect on aflatoxin accumulation via linkage and association mapping. Genes GRMZM2G102760 (ZmLOX 5) and GRMZM2G104843 (ZmLOX 8) …

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Effect Of Carbohydrate Supplement On Cardiovascular And Metabolic Responses To Dual Concurrent Stressors, Matthew John Mcallister Aug 2015

Effect Of Carbohydrate Supplement On Cardiovascular And Metabolic Responses To Dual Concurrent Stressors, Matthew John Mcallister

Theses and Dissertations

Chronic psychological and physiological stress is linked to a high prevalence of cardiovascular disease (CVD). Potentially dangerous cardiovascular responses (e.g., exacerbated cortisol production) can occur with high levels of stress and chronic hypercortisolemia is associated with CVD. The ingestion of carbohydrate (CHO) prior to physical stress may attenuate cortisol responses to stress. The purpose of this project was to investigate the potential effect of CHO ingestion on cortisol production and responses to concurrent stress challenges. Sixteen apparently healthy non-smoking men 21-30 years old participated in a randomized, cross-over, double blind, placebo controlled trial. Participants were tested on four separate sessions. …

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Effect Of Omega-3 Fatty Acid Supplementation To Gestating And Lactating Mares On Milk Igg And Fatty Acid Composition, Mare And Foal Blood Concentrations Of Igg, Fatty Acid Composition, Insulin And Glucose, And Placental Efficiency, Lauren B. Hodge Aug 2015

Effect Of Omega-3 Fatty Acid Supplementation To Gestating And Lactating Mares On Milk Igg And Fatty Acid Composition, Mare And Foal Blood Concentrations Of Igg, Fatty Acid Composition, Insulin And Glucose, And Placental Efficiency, Lauren B. Hodge

Theses and Dissertations

There are conflicting results from previous research evaluating the effects of dietary omega-3 fatty acid supplementation on IgG concentration of colostrum, milk and foal blood. No research has been done on the effect of omega-3 fat supplementation on the placental efficiency of horses or the nitrite concentrations of the placenta as an indicator of vascularization. This study examined the effect of dietary omega-3 supplementation on composition of milk, mare and foal serum and if it will result in transfer of fatty acid in utero as well as providing the foal with adequate IgG concentrations in the milk and colostrum. Omega-3 …

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Output Collusion And The Effects Of Wic Program And Peers On Breastfeeding Activities, Xu Xu Aug 2015

Output Collusion And The Effects Of Wic Program And Peers On Breastfeeding Activities, Xu Xu

Theses and Dissertations

The dissertation includes two projects. The first one studies the product market segmentation and output collusion within substitutes; the second one examines the effects of WIC program and peers on breastfeeding activities. In Chapter I, we extend the differentiated product model, first developed by Bowley (1924), by relaxing the assumption that each firm produces only one differentiated product. By doing so, we are able to analyze the potential for collusive market segmentation in a two stage decision framework, first in product space and second in output. We find that when firms cannot coordinate on output, the required discount factor that …

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Evolutionary And Ecological Causes And Consequences Of Trophic Niche Variation In Ursids, Diana Jean Raper Lafferty Aug 2015

Evolutionary And Ecological Causes And Consequences Of Trophic Niche Variation In Ursids, Diana Jean Raper Lafferty

Theses and Dissertations

Individual variation and fitness are the cornerstones of evolution by natural selection. The trophic niche represents an important source of phenotypic variation on which natural selection can act. Although individual variation is fundamental to species-level ecological and evolutionary change, individual variation is often ignored in population-level approaches to wildlife ecology, conservation and management. Failing to link individual resource use to fitness or to biological outcomes related to fitness limits us to managing for the average resource needs of a population, which may be insufficient for protecting the diversity of resource use within populations and the underlying eco-evolutionary processes that generate …

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Health Motivation For Purchasing Local Foods In The Southeastern United States, Sudha Thapaliya Aug 2015

Health Motivation For Purchasing Local Foods In The Southeastern United States, Sudha Thapaliya

Theses and Dissertations

Health motivation is found to be a significant driver of local foods purchase (Maples et al., 2013; Onozaka, Nurse, and McFadden, 2010), yet it remains unclear what specific health aspects determine consumer purchase decisions. We study the specific health factors focusing on six particular diseases: cancer, heart disease, diabetes, obesity, back/joint pain and Alzheimer’s/dementia to find out whether a relationship exists between disease incidences and consumer decisions to buy local foods. We examine two separate decisions of whether and how frequently southeastern consumers buy local foods in a two-step decision framework known as Double Hurdle model. Results indicate that cancer, …

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A Comparative Study On Phenolic Substances In Selected Black Legumes That Inhibit Digestive Enzymes, Yuqing Tan Aug 2015

A Comparative Study On Phenolic Substances In Selected Black Legumes That Inhibit Digestive Enzymes, Yuqing Tan

Theses and Dissertations

Antioxidant-rich plant foods can inhibit starch and lipid digestion that are relevant to the management of type-II diabetes. Our objective was to compare the three phenolic substances (total phenolic, total flavonoids, and condensed tannin content) in crude, semi-purified extracts from eight types of foods (purified by XAD-7 column), five fractions (semi-purified extracts fractionated by Sephadex LH-20 column) from black legumes, and to compare their antioxidant capacities. The IC50 values of these crude extracts, semi-purified extracts and fractions against alpha-amylase, alpha-glucosidase and lipase were measured. Results showed that Fraction V from black soybean had the lowest IC50 value (0.25 mg/mL) against …

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The Gastrointestinal Tract Microbiota Of The Obligate Bamboo Foragers, The Giant Panda (Ailuropoda Melanoleuca) And The Red Panda (Ailurus Fulgens), Candace Lareine Williams Aug 2015

The Gastrointestinal Tract Microbiota Of The Obligate Bamboo Foragers, The Giant Panda (Ailuropoda Melanoleuca) And The Red Panda (Ailurus Fulgens), Candace Lareine Williams

Theses and Dissertations

Previously, the exact phylogenetic relationship between the giant panda (Ailuropoda melanoleuca) and the red panda (Ailurus fulgens) has been unclear, but with the advent of molecular sequencing technologies, these two animals are now known to be distantly related. Although taxonomically distinct, these two panda species have several things in common, primarily their almost exclusively bamboo diet, but also their similar physical adaptations to their diet and their sympatry in some locations. What was unknown was if their similarities also extended to their gastrointestinal tract (GIT) microbiota. Using next-generation 16S rRNA parallel sequencing technologies, we uncovered several factors that impact bacterial …

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Quality Testing And Selection Of Soybeans For Cultivation In Mississippi For Soymilk And Tofu Production, Shi Meng Aug 2015

Quality Testing And Selection Of Soybeans For Cultivation In Mississippi For Soymilk And Tofu Production, Shi Meng

Theses and Dissertations

Soybeans with large seed size, uniformity, clear hilum, and high 11S/7S ratio are favored for soymilk and tofu making. In order to find ideal soybean lines for food making, sixty-eight soybean lines, which were selected from thousands of accessions in the USDA-Soybean Germplasm Collection, were planted in three successive seasons. Eight lines were identified from twenty-two lines harvested in 2014 (Stoneville, MS) to be suitable for tofu making as judged by chemical composition and sensory quality of tofu. The results provided important food quality information to the growers, breeders and tofu industries for their selection of soybean to improve food …

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Postemergence Control Of Palmer Amaranth With Mesotrione-Based Herbicide Mixtures And The Impact Of Lactofen And Planting Date On The Growth, Development, And Yield Of Indeterminate Soybean, Joseph Paul Mangialardi Aug 2015

Postemergence Control Of Palmer Amaranth With Mesotrione-Based Herbicide Mixtures And The Impact Of Lactofen And Planting Date On The Growth, Development, And Yield Of Indeterminate Soybean, Joseph Paul Mangialardi

Theses and Dissertations

Research was conducted in 2013 and 2014 to evaluate the postemergence control of Palmer amaranth [Amaranthus palmeri (S.) Wats.] with mesotrione alone and in mixtures with fomesafen and/or glyphosate and to evaluate the impact of lactofen and planting date on growth, development, and yield of indeterminate soybean [Glycine max (L.) Merr.]. Studies included a greenhouse evaluation of different rates of mesotrione on the control of 5- and 10-cm Palmer amaranth and field studies evaluating the control of 5- to 10-cm Palmer amaranth with three rates of mesotrione applied alone and in mixtures with fomesafen and/or glyphosate. Lactofen studies include a …

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Effect Of Dietary Lysine On Plasma Amino Acid Profile And Selected Metabolites Of Late-Stage Finishing Pigs, Naresh Regmi Aug 2015

Effect Of Dietary Lysine On Plasma Amino Acid Profile And Selected Metabolites Of Late-Stage Finishing Pigs, Naresh Regmi

Theses and Dissertations

The objective of this study was to evaluate the effects of dietary lysine on plasma concentrations of amino acid (AAs) and other metabolites of finishing pigs. Eighteen crossbred late-stage finishing pigs (9 barrows and 9 gilts) were assigned to three dietary treatments, Diets I (lysine-deficient), II (lysineequate), and III (lysine-excess), according to a randomized complete block design with gender as block. After 4 weeks on trial, jugular vein blood were collected and centrifuged for plasma samples, which were analyzed for concentrations of 24 AAs using HPLC method and 6 selected metabolites related to major nutrient metabolism using ACE Alera Clinical …

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Effects Of Intercropping Switchgrass In Managed Pine Stands On Plant Communities And White-Tailed Deer Forage Production, Bradley Robert Wheat Aug 2015

Effects Of Intercropping Switchgrass In Managed Pine Stands On Plant Communities And White-Tailed Deer Forage Production, Bradley Robert Wheat

Theses and Dissertations

Interest in renewable energy and governmental mandates has motivated land managers to consider cellulosic feedstocks for bioenergy. I investigated plant community response to a system including switchgrass (Panicum virgatum) as a feedstock intercropped with loblolly pine (Pinus taeda). I estimated plant species evenness, richness, and diversity and biomass production, with emphasis on white-tailed deer (Odocoileus virginianus) forages. I detected 225 species in 2,220 1-m2 quadrats, and 7,495 biomass samples (96.4 kg dry weight) from 960 quadrats. Intercropping reduced plant species diversity, total non-pine tree biomass, and biomass of deer forages during switchgrass establishment. These effects were no longer apparent at …

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Effects Of Supplementing Ponies With Dietary Fat On Nutrient Digestibility And Blood Insulin, Glucose, And Fatty Acid Concentrations, Toree Lee Bova Aug 2015

Effects Of Supplementing Ponies With Dietary Fat On Nutrient Digestibility And Blood Insulin, Glucose, And Fatty Acid Concentrations, Toree Lee Bova

Theses and Dissertations

Fat supplementation is a common practice to increase caloric intake in the performance horse. The effects of fat on fiber digestibility is unknown. Understanding of digestibility in the equine digestive tract is limited by sampling technique. While cecal and ileal cannulations have previously been utilized to determine equine nutrient digestibility and gastrointestinal physiology, the current research has been limited to singular portions of the equine digestive tract. The objectives of this dissertation were to determine the effects of dietary fat supplementation on nutrient digestibility and blood insulin, glucose, and fatty acid concentrations using dual cannulated ponies. The first step to …

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Effects Of The Farm Input Subsidy Program On Maize: Identifying Maize Supply And Demand Elasticities In Malawi, Tabitha Charles Nindi Aug 2015

Effects Of The Farm Input Subsidy Program On Maize: Identifying Maize Supply And Demand Elasticities In Malawi, Tabitha Charles Nindi

Theses and Dissertations

While Malawi’s Farm Input Subsidy Program (FISP) has been the focus of numerous studies on the impacts of subsidies on farm-household income, yields, fertilizer use and adoption, there still has not been much empirical work quantifying the program’s effects on maize supply and demand. In this study, we use the econometric framework proposed by Roberts and Schlenker (2013) to identify the effect of FISP on maize production as well as supply and demand price elasticities in Malawi. We use national aggregate data and find that the program has increased aggregate maize supply. Our results show that FISP has had an …

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Effects Of The In Ovo Injection Of Inovocox Em1 Vaccine On The Embryogenesis, Posthatch Performance, And Gut Pathology Of Ross Ross 708 Broilers, Adebayo Oluwaseun Sokale Aug 2015

Effects Of The In Ovo Injection Of Inovocox Em1 Vaccine On The Embryogenesis, Posthatch Performance, And Gut Pathology Of Ross Ross 708 Broilers, Adebayo Oluwaseun Sokale

Theses and Dissertations

Effects of the in ovo injection of Inovocox EM1 vaccine (EM1 vaccine) suspended in commercial diluent on developing broiler embryos were investigated in 3 trials. Effects of the EM1vaccine administered by in ovo injection on broiler embryogenesis and posthatch performance was determined by evaluating site of injection (SOI), embryo staging (ES), hatchability, and chick quality parameters. Oocyst output, microscopic lesion scores, and grow-out performance were further examined through day 35 posthatch. In these studies, it was shown that oocyst output began at day 3 posthatch (6 days post-injection), and peaked at day 7 posthatch (10 days post-injection). The EM1 vaccine …

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Estimation Of Deer Damage To Soybean Production In Mississippi: A Spatial And Temporal Context, Gathel Caleb Hinton Aug 2015

Estimation Of Deer Damage To Soybean Production In Mississippi: A Spatial And Temporal Context, Gathel Caleb Hinton

Theses and Dissertations

Soybean (Glycine max (L.) Merr.) are one of Mississippi’s most profitable agricultural crops. White-tailed deer (Odocoileus virginiaus) damage soybean every year due to the plant’s high palatability, digestibility and nutritional content. I estimated the amount of damage (browsing and loss of yield) caused by deer within 5 soybean fields in eastern Mississippi and compared damage to the number of deer using each field during the 2012 and 2013 growing seasons. I assessed the effectiveness of the chemical repellent Hinder on soybean. While deer did affect soybean height, soybean yield remained unaffected during both years of my study. Given the results …

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Improvements To Broiler Production Through Amino Acid Digestibility And Feed Additives, Cameron Mario Cardenas Aug 2015

Improvements To Broiler Production Through Amino Acid Digestibility And Feed Additives, Cameron Mario Cardenas

Theses and Dissertations

Improvements to broiler production can be made through the means of nutrition and preventative health care. Formulating diets based on a digestible amino acid (AA) basis decreases feed cost and improves bird performance by providing a more accurate diet based on the bird’s specific production or age nutrient requirements. The apparent ileal amino acid digestibility (AIAAD) assay utilized in Experiment 1 demonstrated inconsistent results for age effects on AIAAD of an animal by-product blends for specific AA or age. Increasing pathogenic resistance and consumer’s push on the market, has caused integrators to incorporate alternative medications or inclusion strategies to coccidiosis …

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Integrated Agronomic Management Practices For Tall Fescue In Mississippi, Patton J. Slusher Aug 2015

Integrated Agronomic Management Practices For Tall Fescue In Mississippi, Patton J. Slusher

Theses and Dissertations

Tall fescue (Schedonorus arundinaceus), is a cool season perennial that provides grazing into the early summer months for southern livestock. Grazing the tall fescue variety, Kentucky-31, has negative effects on animal health, particularly after jointing. Two studies were arranged as randomized complete blocks in a split-plot design, with three replicates to compare: the effect of ten herbicides on seedhead suppression, or the effect of inter-seeding legumes [white clover (Trifolium repens) or alfafla (Medicago sativa)] coupled with nitrogen supplementation on fescue yield and forage nutritive value. The herbicides imazethapyr + 2,4-D and without, metsulfuron + chlorsulfuron, reduced seedheads emergence, but not …

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Evaluation Of Hybrids, Planting Dates, And Planting Densities On Corn Growth And Yield Under Rainfed Systems In Mississippi, Matthew W. Hock Aug 2015

Evaluation Of Hybrids, Planting Dates, And Planting Densities On Corn Growth And Yield Under Rainfed Systems In Mississippi, Matthew W. Hock

Theses and Dissertations

Improved hybrid genetics and more efficient farming techniques have increased corn (Zea mays L.) production and grain yields for Mid-South farmers. Early planting is one technique to mitigate heat and drought stress that negatively influence grain production. The first objective was: a) determine the effect of early planting on grain yield, b) to determine the effects on physiological characteristics and c) determine if some hybrids are better suited for early planting. Data suggest there were yield advantages for early planted treatments. Starkville 2014 yields exhibited the greatest reduction of .80 Mg ha-1 for each week that planting was delayed. A …

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Exploring The Role Of Dopamine In Stress Response And Aging In Drosophila Melanogaster - Implications For Neurodegenerative Diseases, Marley Elyse Hanna Aug 2015

Exploring The Role Of Dopamine In Stress Response And Aging In Drosophila Melanogaster - Implications For Neurodegenerative Diseases, Marley Elyse Hanna

Theses and Dissertations

Dopamine (DA) is a catecholamine that is involved in several neural functions such as modulation of locomotor behaviors, arousal states to appetitive aversive learning and memory. The relationships between DA, stress response and aging are unclear. This thesis examines numerous physiological, behavioral and biochemical parameters following perturbations in DA synthesis and transport in the Drosophila melanogaster model system. Intriguingly, elevated DA pools appear to confer protection, while depleted DA levels or transport increase susceptibility to oxidative insult. Resistance to oxidative stress in mutants with elevated DA levels was attributed to a significant up-regulation of glutathione S-transferase Omega-1. A sexually dimorphic …

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