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2015

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Investigating Phylogenetic Relationships Of Mosquito-Borne Avian Malaria In Mississippi, David Alan Larson Dec 2015

Investigating Phylogenetic Relationships Of Mosquito-Borne Avian Malaria In Mississippi, David Alan Larson

Theses and Dissertations

The vectors of avian malaria (Haemosporida) are an understudied component of wildlife disease ecology. Most studies of avian malaria have focused on the secondary bird hosts. This imbalance leaves a significant gap in our knowledge and understanding of the insect hosts. This study investigates the diversity of malaria parasites carried by mosquitoes (Diptera, Culicidae) in the state of Mississippi. Using PCR techniques, haemosporidian infection rates were determined and parasites were identified in a phylogenetic context to those previously annotated. A total of 27,157 female mosquitoes representing 15 species were captured. Five of those species tested positive for malaria parasites with …

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Investigating The Relationship Between Stream Gauge Stage And Nearby Soil Moisture In A Longleaf Pine Biome, Cheryl S. Mclaurin Dec 2015

Investigating The Relationship Between Stream Gauge Stage And Nearby Soil Moisture In A Longleaf Pine Biome, Cheryl S. Mclaurin

Theses and Dissertations

With over 10,000 acres burned in wildland fires in 2014 in Mississippi, accurate fire hazard prediction is of great importance. Soil moisture, fuel moisture, and fire hazard are inextricably linked. Remote estimation of soil moisture in the Southeastern United States for fire hazard modeling is hampered by the use of models engineered for other physiographic regions and the prevalence of deep, fast-draining sands underneath heavy vegetation. United States Geologic Service hydrographs were investigated and compared to nearby soil moisture and precipitation readings in an attempt to identify the links between stream gauge readings and watershed soil moisture. Stream gauge peaks …

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Investigations At Kinlock (22su526), A Freshwater Mussel Shell Ring In The Delta Region Of Mississippi, James Bradley Carlock Dec 2015

Investigations At Kinlock (22su526), A Freshwater Mussel Shell Ring In The Delta Region Of Mississippi, James Bradley Carlock

Theses and Dissertations

Kinlock is a freshwater mussel shell ring site located in Sunflower County in the Mississippi Delta. Little work has been done at freshwater mussel shell rings, and therefore little is known about them. This thesis uses four different data collection methods to answer questions of chronology, site layout, etc. These four methods are controlled surface collection, excavation, coring, and magnetometry. Based on the results of these methods, Kinlock was found to be a Woodland period mussel shell ring with a later Mississippian period component built on top of the shell. This later component consisted of five mounds situated around a …

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Isolation In The South: Poverty And Transportation Infrastructure In The Black Belt, Derrick Ryan Shapley Dec 2015

Isolation In The South: Poverty And Transportation Infrastructure In The Black Belt, Derrick Ryan Shapley

Theses and Dissertations

This study examines the relationship between transportation infrastructure and social well-being in the United States South, especially in the Black Belt. Specifically, this study focuses on the impact of airport accessibility and improvements on social well-being within the community capital framework in which built capital and political capital acted as a foundational basis for the broader concept of positive community capital. The results indicated that many cumulative disadvantages exist in the Black Belt of the southern United States. The research found that a higher level of airport accessibility is associated with a lower level of poverty and higher levels of …

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K Calibration For Corn And Soybean At -3 And -1/3 Bar Soil Moisture Levels (A Case Study Of Some Malawi Soils), Julia Nyembezi Qoto Dec 2015

K Calibration For Corn And Soybean At -3 And -1/3 Bar Soil Moisture Levels (A Case Study Of Some Malawi Soils), Julia Nyembezi Qoto

Theses and Dissertations

A greenhouse pot study was conducted on three soils with varying clay contents to establish K critical value at -3 and -1/3 bar soil moisture levels. Four K fertilizer treatments (0, 0.07, 0.14, and 0.3 g/pot) replicated three times were arranged in a complete randomized block design. The Cate-Nelson graphical procedure revealed that K critical values for corn and soybeans were not equal at the two designated moisture levels. The corresponding percentage yield however was higher at -1/3 bars for corn and at -3 bars for soybean. Statistical regression analysis showed that there was a minor response in plant tissue …

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Life Experiences Following Trauma For Three African American Females: A Qualitative Study, Gwendolyn Dale Tyson Dec 2015

Life Experiences Following Trauma For Three African American Females: A Qualitative Study, Gwendolyn Dale Tyson

Theses and Dissertations

Victims of trauma are likely to experience diverse social, psychological, and physical problems, but very little is known about how these experiences impact Vocational Rehabilitation employment outcomes and other aspects of life. This research provides detailed experiences of the impact of trauma on the lives of three young adult African American women with disabilities who live in one of the poorest states in the southern part of the country. Each participant shared their experiences of trauma and the onset of impairment early in their adult lives and the impact that it had on their employment and other aspects of life. …

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Factors That Impact Successful Student Achievement In Post-Secondary Online Courses, Meranda Lychelle Esters Dec 2015

Factors That Impact Successful Student Achievement In Post-Secondary Online Courses, Meranda Lychelle Esters

Theses and Dissertations

The purpose of this study was to determine if there was a significant differences in students based of education demographics and what factors contributed to the successful completion of online courses for postsecondary education students. Specifically, this study sought to determine if there was a significant difference between certain educational demographics (gender, race, classification, course, and professor) and grade; a significant relationship between specific online course features (availability of chat, videos, discussion boards, and video conferences) and grade; a significant relationship between certain student behaviors (location of access, time to complete assignments, interaction with content, frequency of access, interaction with …

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Feed Quality Effects On Modern Heavy Broiler Performance, Robert Benjamin Sellers Dec 2015

Feed Quality Effects On Modern Heavy Broiler Performance, Robert Benjamin Sellers

Theses and Dissertations

Commercial broilers are fed exclusively pelleted diets; this is due to research that has demonstrated numerous benefits to feeding pellets. The first objective was to investigate the effects of modest improvements in pellet quality on two modern broiler strains. Regardless of strain, feeding 80% pellets improved broiler performance from d 28 to 42. The second objective was to investigate the effects of feed form and liquid application method on feed augering segregation and subsequent broiler performance. In general, percent pellets steadily decreased across location throughout feed augering. Also, phytase segregation occurred throughout augering and was exacerbated in post-pellet liquid application …

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First Principles Investigation Of Substituted Strontium Hexaferrite, Vivek Dixit Dec 2015

First Principles Investigation Of Substituted Strontium Hexaferrite, Vivek Dixit

Theses and Dissertations

This dissertation investigates how the magnetic properties of strontium hexaferrite change upon the substitution of foreign atoms at the Fe sites. Strontium hexaferrite, SrFe12O19 is a commonly used hard magnetic material and is produced in large quantities (around 500,000 tons per year). For different applications of strontium hexaferrite, its magnetic properties can be tuned by a proper substitution of the foreign atoms. Experimental screening for a proper substitution is a cost-intensive and time-consuming process, whereas computationally it can be done more efficiently. We used the ‘density functional theory’ a first principles based method to study substituted strontium hexaferrite. The site …

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Groups Of Isometries Associated With Automorphisms Of The Half - Plane, Job Otieno Bonyo Dec 2015

Groups Of Isometries Associated With Automorphisms Of The Half - Plane, Job Otieno Bonyo

Theses and Dissertations

The study of integral operators on spaces of analytic functions has been considered for the past few decades. However, most of the studies in this line are based on spaces of analytic functions of the unit disc. For the analytic spaces of the upper half-plane, the literature is still scanty. Most notable is the recent work of Siskakis and Arvanitidis concerning the classical Ces`aro operator on Hardy spaces of the upper half-plane. In this dissertation, we characterize all continuous one-parameter groups of automorphisms of the upper halfplane according to the nature and location of their fixed points into three distinct …

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How County Supervisor Perceptions And Education Level Affect Local Community College Funding, Daryl Jason Dedwylder Dec 2015

How County Supervisor Perceptions And Education Level Affect Local Community College Funding, Daryl Jason Dedwylder

Theses and Dissertations

The purpose of this exploratory study was to examine whether a significant correlation exists between a locally-elected supervisor’s perceptions about their local community college and their education level and the level of local tax support provided to the community college in their area. There were 3 research hypotheses established. A self-developed survey was used to gather supervisor perceptions in the following areas: 1) community college courses, programs, and workforce training services, 2) job attainment of students after attending the local community college, and 3) how well the local community college manages its resources. Additional information was gathered for inclusion in …

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Antioxidative Efficacy And Relative Accessible Hydrophobicity Of Aromatic Residue Rich Peptides In Alfa-Chymotryptic Digests Of Acid Casein, Wenjie Shao Dec 2015

Antioxidative Efficacy And Relative Accessible Hydrophobicity Of Aromatic Residue Rich Peptides In Alfa-Chymotryptic Digests Of Acid Casein, Wenjie Shao

Theses and Dissertations

Four casein-derived peptides fractions of varying hydrophobicity were obtained from á-chymotryptic digest of acid casein using hydrophobic interaction chromatography, termed fractions one through four (abbreviated, F1, F2, F3, and F4). Four standard methods involving alkoxyl, peroxyl, 2, 2-diphenyl-1-picrylhydrazl (DPPH), and 2, 2'-azino-bis (3-ethylbenzothiazoline-6-sulphonic acid) ABTS•+ radicals, were used to measure antioxidative properties. While significantly superior efficacy was exhibited by F2 for all tests except against DPPH, no correlation between antioxidant efficacy and surface hydrophobicity was found. By using capillary electrophoresis and high performance liquid chromatography, the detection of aromatic chromophores by ultraviolet at 280 nm in the fractions revealed that …

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Graduation Rates Of Pell Grant Recipients At Mississippi Community Colleges, Christopher C. Armstrong Dec 2015

Graduation Rates Of Pell Grant Recipients At Mississippi Community Colleges, Christopher C. Armstrong

Theses and Dissertations

The purpose of this study was to determine the effect receiving a Pell Grant or not receiving a Pell Grant had on graduation rates at Mississippi community colleges. National averages suggest that Pell Grant recipients graduate at a much lower rate than non-recipients. This proved not to be the case in Mississippi. There were three Mississippi community colleges that participated in this study. The total number of students involved in the study was 3,479. The colleges provided the researcher information on Pell Grant status, gender, and ethnicity (i.e., Caucasian, African American, Hispanic or non-Hispanic, American Indian, Asian, or other). Students …

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N-Heterocyclic Carbene Complexes Of Ag(I) And Zr(Iv): Ag(I)-Halide Cubane Type Clusters And The Mechanism Of Hydroamination With -Nhc Pincer Complexes, Wesley D. Clark Dec 2015

N-Heterocyclic Carbene Complexes Of Ag(I) And Zr(Iv): Ag(I)-Halide Cubane Type Clusters And The Mechanism Of Hydroamination With -Nhc Pincer Complexes, Wesley D. Clark

Theses and Dissertations

The synthesis and characterization of the first series of tetra-NHC-Ag(I)-X cubane clusters are reported. The clusters were characterized with 1H and 13C NMR spectroscopy, ESI-TOF MS, and single crystal X-ray diffraction. Crossover experimental data were consistent with intramolecular exchange, which can be visualized by a molecular rotating type mechanism. Additionally, -NHC Zr(IV) pincer type complexes were synthesized and characterized with 1H and 13C NMR spectroscopy, CHN combustion analysis, and X-ray crystallography. A large rate effect was observed based on the halogen and metal center for the hydroamination/cyclization of unactivated aminoalkenes. Zirconium based pincers provided faster reaction rates than their hafnium …

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Nutrient Management In Reblooming Iris 'Immortality', Xiaojie Zhao Dec 2015

Nutrient Management In Reblooming Iris 'Immortality', Xiaojie Zhao

Theses and Dissertations

For its fragrance, showy display and multi-colors, tall bearded (TB) iris (Iris germanica L.) has great potential as a specialty cut flower. This study was conducted to investigate the optimum nutrient management, especially nitrogen (N), of reblooming TB iris 'Immortality'. The objectives were to investigate the effects of N rate and form and phosphorus (P) rate on growth, flowering, and nutrient uptake, and to assess seasonal changes in the composition of nitrogenous compounds and carbohydrates. In general, greater N rates increased plant height, leaf SPAD reading, the number of inflorescence stems, plant dry weight, plant N content, and uptake of …

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Selection Dynamics In Heliconius Hybrid Zones And The Origin Of Adaptive Variation, Steven Grant Shaak Dec 2015

Selection Dynamics In Heliconius Hybrid Zones And The Origin Of Adaptive Variation, Steven Grant Shaak

Theses and Dissertations

There is repeated evidence that hybridization is a major contributor to the production of adaptive diversity; however, the evolutionary fate of hybrids in natural populations remains poorly understood. In Heliconius butterflies, hybridization is common and responsible for generating a variety of warning color patterns across the genus. Predator avoidance of warning colorations appears to largely be learned, which drives strong positive frequency-dependent selection. This creates a paradox for hybrid lineages: how do novel hybrid forms manage to establish and persist under such strong selection? In this dissertation, I present a series of studies centered on the selection dynamics of Heliconius …

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Simulation Of An Axion Search Experiment, Yipeng Jiang Dec 2015

Simulation Of An Axion Search Experiment, Yipeng Jiang

Theses and Dissertations

The resolution of the strong CP problem postulates a new dark matter candidate known as the axion. Axions can couple with photons in the presence of a strong magnetic field. Light shining through wall method (LSW) uses a lead wall inside a cavity with a strong magnetic field to coupled axions with photons then detect axions when the axions cross the lead wall and convert back to photons. The axion signal and thermal noise are simulated and by comparing the simulated signals after they have been rectified and integrated, the sensitivity of the planned experiment was determined.

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Spatial Pattern Analysis Of Agricultural Soil Properties Using Gis, Corrin Jared Mccarn Dec 2015

Spatial Pattern Analysis Of Agricultural Soil Properties Using Gis, Corrin Jared Mccarn

Theses and Dissertations

Agricultural soil properties exhibit variation over field plot scales that can ultimately effect the yield. This study performs multiple spatial pattern analyses in order to design spatially dependent regression models to better understand the interaction between these soil properties. The Cation Exchange Capacity (CEC) and Calcium-Magnesium Ratio (CaMgR) are analyzed with respect to Calcium, Magnesium, and soil moisture values. The CEC and CaMgR are then used to determine impact on the yield values present for the field. Results of this study show a significant measure of model parsimony (0.979) for the Geographically Weighted Regression (GWR) model of the CEC with …

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Preventing Teacher Attrition: Expert Teachers' Sources Of Stress And Coping Strategies, Katherine Damaris Garth Dec 2015

Preventing Teacher Attrition: Expert Teachers' Sources Of Stress And Coping Strategies, Katherine Damaris Garth

Theses and Dissertations

Teaching is considered to be one of the most stressful occupations (Johnson et al., 2005). Not only is the profession highly stressful, it has the highest degree of career turnover of any profession (Ingersoll, 2001). Consistent stress can lead to burnout of the profession. McCarthy et al. (2009) noted that teacher burnout can be a result of inappropriate coping resources. The purpose of this study was to investigate the sources of stress, coping strategies, and learned coping strategies among expert elementary teachers. The sources of stress and coping strategies were examined using the Social Ecological Model which allowed for sources …

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Student Perceptions Of Dual Enrollment And Dual Credit In A Mississippi Community College, Lachandra Belisa Smith Dec 2015

Student Perceptions Of Dual Enrollment And Dual Credit In A Mississippi Community College, Lachandra Belisa Smith

Theses and Dissertations

The purpose of this study is to ascertain students’ perspectives on dual enrollment and dual credit in a south Mississippi community college. The problem is the need to understand the perceptions of students regarding dual enrollment and dual credit to help foster better policies surrounding the program, help promote positive benefits for the students, and overall improve dual enrollment and dual credit to better suit the growing need and demand for a college degree. Dual enrollment and dual credit have become prominent in the U.S. Many studies have shown to have positive outcomes including increased high school completion rates, improved …

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Subspecies Composition, Genetic Variation And Structure Of Largemouth Bass In Puerto Rico Reservoirs, Nick Ryan Peterson Dec 2015

Subspecies Composition, Genetic Variation And Structure Of Largemouth Bass In Puerto Rico Reservoirs, Nick Ryan Peterson

Theses and Dissertations

Subspecies composition and genetic variation are important to the growth and survival of Largemouth Bass and information on these genetic characteristics is required for proper management of the species. In Puerto Rico, a genetic evaluation is needed to develop management plans for Puerto Rico reservoirs and maintain Florida Largemouth Bass at the Maricao Hatchery. Subspecies composition was characterized among reservoirs and the contemporary Maricao Hatchery broodstock in Puerto Rico, and metrics were compared between subspecies and hybrids among reservoir populations. Genetic variation and structure was determined and compared to Largemouth Bass populations in their native range. Florida subspecies were prevalent …

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Superfluids Of Fermions In Spin-Orbit Coupled Systems And Photons Inside A Cavity, Yi-Xiang Yu Dec 2015

Superfluids Of Fermions In Spin-Orbit Coupled Systems And Photons Inside A Cavity, Yi-Xiang Yu

Theses and Dissertations

This dissertation introduces some new properties of both superfluid phases of fermions with spin-orbit coupling (SOC) and superradiant phases of photons in an optical cavity. The effects of SOC on the phase transition between normal and superfluid phase are revealed; an unconventional crossover driven by SOC from the Bardeen-Cooper-Schrieffer (BCS) state to the Bose-Einstein condensate (BEC) state is verified in three different systems; and two kinds of excitations, a Goldstone mode and a Higgs mode, are demonstrated to occur in a quantum optical system. We investigate the BCS superfluid state of two-component atomic Fermi gases in the presence of three …

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Synthesis And Catalytic Activity Of -Nhc Group 9 Metal Pincer Complexes, Sean William Reilly Dec 2015

Synthesis And Catalytic Activity Of -Nhc Group 9 Metal Pincer Complexes, Sean William Reilly

Theses and Dissertations

N-Heterocyclic carbenes (NHCs) are one of the few ligand systems that can finely tune transition metal catalysts via sterics and electronics. The strong sigma-donating properties of these ancillary ligands allow the development of robust tridentate NHC pincer framework, which has emerged as an alternative to the phosphine pincer ligands. The combination of NHC and pincer systems has resulted in a new generation of catalytically active organometallic complexes reported throughout the literature. -NHC Rh pincer complexes were found to be catalytically active in C-C and C-B bond formation via 1,4dition reactions. In addition, the in-situ generated -NHC Ir(H) pincer complex demonstrated …

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Reproductive Biology Of The Female Bottlenose Dolphin (Tursiops Truncatus), Holley Stone Muraco Dec 2015

Reproductive Biology Of The Female Bottlenose Dolphin (Tursiops Truncatus), Holley Stone Muraco

Theses and Dissertations

The goal of this long-term study was to better understand the reproductive biology of the female bottlenose dolphin (Tursiops truncatus) and provide a hypothesis for how dolphins may communicate reproductive readiness to one another. Utilizing conditioned dolphins in aquaria, this dissertation examined several previously unknown aspects of dolphin reproduction, including ovarian follicular dynamics during the luteinizing hormone surge, urinary prolactin levels, estrus behavior, vaginal fluid arboriform arrangement, in-situ vaginal and cervical anatomy during estrus, reversed-phase high-performance liquid chromatography (RP-HPLC) of urine samples to identify proteins and peptides that may be used in chemical communication, and a review and anatomical analysis …

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Promoting The Interest Of African American Teenage Girls In Science: What Can We Learn From An Exemplary African American Science Teacher?, Cynthia Stewart Mcmath Dec 2015

Promoting The Interest Of African American Teenage Girls In Science: What Can We Learn From An Exemplary African American Science Teacher?, Cynthia Stewart Mcmath

Theses and Dissertations

This study focused on science teaching that promoted the interest of African American teenage girls in the science classroom of an exemplary African American science teacher. It focused on, observed and examined the planning, teaching and learning strategies used by the science teacher. It also described what the science teacher experienced during her high school years, during college, during her teaching career. The case study approach/method was used for this research to capture the description and examination of the practices of the science teacher. This research described how an African American female science teacher serves as a role model and …

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Identification Of Purpurogallin In Brewed Beverages And Effect Of Roasting On Antioxidant Activity And Phenolic Compounds In Coffees, Yu-Chen Liao Dec 2015

Identification Of Purpurogallin In Brewed Beverages And Effect Of Roasting On Antioxidant Activity And Phenolic Compounds In Coffees, Yu-Chen Liao

Theses and Dissertations

Coffee contains many antioxidants including purpurogallin, which is a hydrophobic phenolic antioxidant that is difficult to measure with reported methods. A method combining solid-phase extraction and liquid chromatography–mass spectrometry was developed to detect and quantify purpurogallin in brewed beverages, including coffee. For beverage preparation, water extraction was adopted for improved correlation with moka pot brewing. Purpurogallin was detected in all commercial coffee samples, and its content in ground coffees ranged from 455-630 ng/g dry weight. Purpurogallin was only detected in two English breakfast tea samples (335-360 ng/g dry weight) and was not detected in any cocoa sample. Antioxidant activity, total …

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Illicit Use Of Adhd Stimulant Medications: Gender Differences In Perceptions Of Risk, Joanna C. Hachtel Dec 2015

Illicit Use Of Adhd Stimulant Medications: Gender Differences In Perceptions Of Risk, Joanna C. Hachtel

Theses and Dissertations

Little research exists on gender differences regarding prevalence or perceptions of risk associated with college students’ misuse, illegal consumption, and diversion of prescription stimulant medications. Data from Mississippi State University undergraduates (N = 1,714) were examined for gender differences in illicit behaviors and related risk perceptions. Men were more likely to report consumption and diversion, but not more likely to report misuse of their own prescription stimulants. Overall, men reported lower risk perceptions associated with consumption of others’ prescription stimulants. This finding held true for legal and health risk perceptions for those uninvolved in diversion or consumption, for health risk …

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Impact Of Corn Earworm On Field Corn Yield And Grain Quality, Jenny Lee Bibb Dec 2015

Impact Of Corn Earworm On Field Corn Yield And Grain Quality, Jenny Lee Bibb

Theses and Dissertations

Field corn, Zea mays L., has been introduced to the market with pyramided Bacillus thuringiensis (Bt) corn technologies. These technologies reduce kernel damage from ear feeding caterpillar pests, including corn earworm, Helicoverpa zea (Boddie). The first generation Bt traits in field corn demonstrated limited activity on corn earworm feeding on grain in ears. The pyramided corn technologies have greater cumulative protein concentrations and improved expression throughout the plant, so these corn traits should provide an effective management tool against these pests. In addition, reduced kernel injury may also have a direct effect on physical grain quality. The results for this …

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Impact Of Irrigation Applications At Soil Moisture Deficits On Plant Development And Yield Of Indeterminate And Determinate Soybean Varieties, Andy J. Brown Dec 2015

Impact Of Irrigation Applications At Soil Moisture Deficits On Plant Development And Yield Of Indeterminate And Determinate Soybean Varieties, Andy J. Brown

Theses and Dissertations

As the Mississippi River Alluvial Aquifer declines, it is the duty of soybean producers to become more efficient irrigators. Research was established in 2012 and 2013 in the Mississippi Delta to evaluate plant development and yield of an indeterminate soybean variety with irrigation initiated at the R1 producer standard and compared to initiation timings at the R2, R4, and R5 growth stages once a 2” deficit was reached according to the FAO-56 Penman-Monteith model. Research was also conducted to evaluate seeding rates in irrigated and non-irrigated systems in Starkville and Stoneville, MS in 2013 and 2014. These data indicate that …

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Influence Of Market Setting And Time Of Purchase On Counts Of Aerobic Bacteria, Escherichia Coli, And Coliform And Prevalence Of Salmonella And Listeria In Beef, Pork, And Chicken In Vietnam, April Kathleen Mccain Dec 2015

Influence Of Market Setting And Time Of Purchase On Counts Of Aerobic Bacteria, Escherichia Coli, And Coliform And Prevalence Of Salmonella And Listeria In Beef, Pork, And Chicken In Vietnam, April Kathleen Mccain

Theses and Dissertations

The objective of this study was to determine the influence of market type and sampling time on Salmonella and Listeria prevalence and microbiological quality of 540 beef, pork, and whole chicken samples collected in 6 supermarkets (SM), 6 indoor markets (IM), and 6 open markets (OM) at opening (T0) and 4 h after the opening (T4) in Vietnam. Salmonella and Listeria prevalence ranged from 30.4 to 71.0% and 56.6 to 99.9 %, respectively, in beef, pork, and chicken in Vietnam. Aerobic bacteria counts ranged from 10.5 to 11.6 log CFU/g, whereas, E. coli and coliform counts ranged from 7.2 to …

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