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Articles 1 - 17 of 17
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Assessment Of Interactions Amoung Viruses Infecting Sweetpotato, Charalambos D. Kokkinos
Assessment Of Interactions Amoung Viruses Infecting Sweetpotato, Charalambos D. Kokkinos
LSU Doctoral Dissertations
Viral diseases, especially those caused by mixed infections, are among the economically most important diseases of sweetpotato. Real-time PCR assays were developed for the detection and quantification of the potyviruses Sweet potato feathery mottle virus (SPFMV), Sweet potato virus G (SPVG), Ipomoea vein mosaic virus (IVMV); the crinivirus Sweet potato chlorotic stunt virus (SPCSV), and the begomovirus Sweet potato leaf curl virus (SPLCV) directly from infected sweetpotato plants. Titers of SPFMV, IVMV, and SPVG were lower in singly-infected sweetpotato plants compared to singly-infected plants of the standard indicator host Brazilian morning-glory (Ipomoea setosa) and the standard propagation host I. nil …
College Student's Motivation For Physical Activity, Lori Lynn Delong
College Student's Motivation For Physical Activity, Lori Lynn Delong
LSU Doctoral Dissertations
The purpose of this study was to examine college students' motivations to be physically active by merging the perspectives of self-determination theory and the transtheoretical model. The secondary purpose was to examine the effects of a required physical activity course on college students' levels of physical activity. The premise is that both the theory and model can be used to help predict physical activity outcomes. Participants were 277 male and female students at a small private college. Motivation, self-determination, stage of change, self-efficacy, decisional balance, and leisure time activity levels were assessed using an online survey. Results revealed that activity …
Self-Determination In Physical Education: Designing Class Environments To Promote Active Lifestyles, Charity Leigh Bryan
Self-Determination In Physical Education: Designing Class Environments To Promote Active Lifestyles, Charity Leigh Bryan
LSU Doctoral Dissertations
The purpose of this study was to investigate the relationships between self-determination, perceptions of the motivational climate, attitude, perceived ability, engagement in physical activity, and health-related fitness indicators. Two structural models related to engagement/intention to engage in physical activity and health-related fitness were tested. The premise of both models is that perceived competence predicts the outcome variables (engagement or health-related fitness), with self-determination, attitude, and motivational climate predicting perceived competence. Participants were 827 sixth, seventh, and eighth graders. Motivation, perceptions of the climate, attitude, perceived competence, and self-reported physical activity levels were assessed using surveys. Pedometers were used to record …
Econometric Essays On Specification And Estimation Of Demand Systems, Anil Kumar Sulgham
Econometric Essays On Specification And Estimation Of Demand Systems, Anil Kumar Sulgham
LSU Doctoral Dissertations
This dissertation focuses on two research themes related to econometric estimation of linear almost ideal demand systems (LAIDS) for U.S. meats. The first theme addresses whether nonstationarity (unit-roots and cointegration) contributes to a dynamic specification of LAIDS models. The results of the effect of nonstationarity are reported in two case studies. The second theme explores the relationship between age and household size with budget shares to specify semiparametric LAIDS model. The results are reported in a third case study that compares parametric and semiparametric models estimates of price and expenditure elasticities. The first case study conducts a comparative analysis of …
Self-Regulation In Physical Activity: Understanding Decisions That Older Adults Make, Janene Marie Grodesky
Self-Regulation In Physical Activity: Understanding Decisions That Older Adults Make, Janene Marie Grodesky
LSU Doctoral Dissertations
Physical activity and exercise have been shown to strongly contribute to an extended quality of life. Half of all physical declines in aging can be prevented by engaging in adequate levels of daily physical activity. Only one in four older adults over the age of 65 participates in regular physical activity. There are various factors that have been identified in this population that influence physical activity behaviors including gender, ethnicity, education, and socioeconomic status. Though important for providing baseline data on older adults, these descriptions do not fully explain why or why not this population engages in physical activity; or …
The Effects Of Perceptions On Consumer Acceptance Of Genetically Modified (Gm) Foods, Jae-Hwan Han
The Effects Of Perceptions On Consumer Acceptance Of Genetically Modified (Gm) Foods, Jae-Hwan Han
LSU Doctoral Dissertations
This study investigates the effects of risk/benefit beliefs on consumer purchase intentions for genetically modified (GM) foods. A random, national, mail survey is conducted. Three main problems are addressed in the study. The first problem addressed is to analyze the relationship between consumers risk/ benefit beliefs regarding GM foods, and their willingness to buy GM crop and meat products. The second problem deals with linkages between a consumer’s risk/benefit beliefs about GM foods and willingness to pay (WTP) for GM foods with a benefit disclosure. The third problem addressed is to test a causal relationship between knowledge and trust toward …
Detection And Survival Of Escherichia Coli O157:H7 In Cattle Water Troughs And The Effects Of Cetylpyridinium Chloride Against Escherichia Coli O157:H7 Biofilms On The Surface Of Stainless Steel, Sajida Begum Plauche
Detection And Survival Of Escherichia Coli O157:H7 In Cattle Water Troughs And The Effects Of Cetylpyridinium Chloride Against Escherichia Coli O157:H7 Biofilms On The Surface Of Stainless Steel, Sajida Begum Plauche
LSU Doctoral Dissertations
Escherichia coli O157:H7 is an emerging food pathogen that was first identified as a cause of illness in 1982. According to CDC (The Center for Disease Control and Prevention) estimates, E. coli O157:H7 is responsible for about 73,000 illnesses, 2,000 hospitalizations and 60 deaths in the United States each year. Cattle are the principal reservoir of E. coli O157:H7. Contamination of feed and drinking water with cattle feces is an importance factor in the prevalence of infection in cattle which, in turn, results in contamination of food and the environment. Escherichia coli O157:H7 is a very persistent pathogen and has …
Biomechanical Characteristics Of Low Back Tissues During Trunk Flexion-Extension, Michael William Olson
Biomechanical Characteristics Of Low Back Tissues During Trunk Flexion-Extension, Michael William Olson
LSU Doctoral Dissertations
Analysis of the mechanical and neural regulatory mechanisms of the flexion-relaxation phenomenon (FRP), observed in deep trunk flexion, was performed since it is believed these mechanisms provide insight into the causes of low back injury and pain. Three methods were used to analyze the behavior of the lumbar tissues during trunk flexion-extension exercises: 1) active continuous cyclic movement, 2) acute cyclic movement at different orientations, and 3) passive continuous cyclic movement. All activities were performed at a rate of 0.1 Hz (6 cycles•min-1) while monitoring the surface electromyography (EMG) of the lumbar paraspinal muscles. Abdominal, hamstring, and quadriceps muscle activities …
Evaluation Of A Plasmid Delivery System For Production Of Gnrh And Ghrh In The Horse And Goat, William Andrew Storer
Evaluation Of A Plasmid Delivery System For Production Of Gnrh And Ghrh In The Horse And Goat, William Andrew Storer
LSU Doctoral Dissertations
The efficacy of a novel plasmid delivery system was assessed for long-term expression of gonadotropin releasing hormone (GnRH) and growth hormone releasing hormone (GHRH) in horses and goats. The efficacy of the technology was demonstrated using 3 novel plasmids: pSEAP [expressing secreted embryonic alkaline phosphatase (SEAP)], pGHRH (expressing GHRH), and pGnRH (expressing GnRH). Geldings were electroporated with a reporter plasmid expressing SEAP in 3 muscle sites. Expression of SEAP, measured from jugular plasma samples, indicated muscle specificity for uptake and expression of the plasmid. Concentrations of SEAP were greatest (P < 0.05) after pectoralis injection, which was chosen as the site for electroporation in subsequent studies. In a second experiment, stallions were electroporated with pGHRH or pSEAP to evaluate the effect of long-term GHRH treatment on the growth hormone (GH) axis and testicular function. Stallions treated with pGHRH had increased (P < 0.05) plasma concentrations of IGF-I, increased (P < 0.05) volume of accessory sex gland fluid, and increased (P < 0.05) number of normal spermatozoa in the ejaculate relative to controls. In the third experiment, stallions were electroporated with pGnRH or pSEAP to test the effects of GnRH on the reproductive axis. Treatment with pGnRH increased (P < 0.05) plasma testosterone concentrations to d 56 and increased (P < 0.01) the LH response to GnRH on d 21, but did not alter (P > 0.1) seminal characteristics evaluated after 36 d of treatment. In …
Physical Activity Behavior Of University Students: An Ecological Approach, Lisa Gaye Johnson
Physical Activity Behavior Of University Students: An Ecological Approach, Lisa Gaye Johnson
LSU Doctoral Dissertations
Despite the health benefits associated with active lifestyles, a majority of adults do not engage in sufficient levels of physical activity (PA). Few individual-focused interventions have produced sustained changes in PA behavior. Therefore, public health officials are promoting the use of ecological approaches to examine the multidimensional factors that influence choices about PA and other health behaviors. National statistics are mirrored in college populations, with one-half of students in the US failing to meet current PA recommendations and one-third classified as either overweight or obese. In light of this, increasing PA and obesity prevention have been identified as the top …
Vitrification And Dehydration For The Preservation Of Gametes, Allison E. Moisan
Vitrification And Dehydration For The Preservation Of Gametes, Allison E. Moisan
LSU Doctoral Dissertations
Of the 36 species of felines in the world, all except the domestic cat are listed as endangered or threatened. To preserve the genetic diversity of felines and other species, genome resource banks have been established. Due to limited availability of germ cells for research, studies must use models to optimize the techniques before they are applied to endangered species. In this study, preservation of oocytes and spermatozoa was examined using the bovine as a model for felines. In the first series of experiments, bovine and feline oocytes were dehydrated, vitrified, warmed and cultured to assess their ability to undergo …
Self-Determination In Injury Rehabilitation: Designing A Climate For Promoting Adherence, Ryan Mark Green
Self-Determination In Injury Rehabilitation: Designing A Climate For Promoting Adherence, Ryan Mark Green
LSU Doctoral Dissertations
The purpose of this dissertation was to use self-determination as a theoretical framework to investigate factors that influence college athletes’ adherence to injury rehabilitation programs. A two-part study, quantitative and qualitative approaches were used to gain insight into athletes’ motivation and decisions that they make regarding their engagement in injury rehabilitation. The focus of the quantitative study was to investigate the relationships between personal autonomy, levels of self-determination, perceived autonomy support, and perceived competence in injury rehabilitation. Participants (N=193 college athletes) completed surveys in a retrospective design. Autonomy orientations were positively related to higher levels of self-determination and the perception …
Gamete And Cell Technologies For Use In Biological Resource Banking, Liesl Nel-Themaat
Gamete And Cell Technologies For Use In Biological Resource Banking, Liesl Nel-Themaat
LSU Doctoral Dissertations
Biological resource banking is becoming important for endangered species conservation. A series of experiments were conducted to address issues concerning collection and utilization of biomaterials from Gulf Coast Native (GCN) sheep (model species) (Ovis aries) and Eland antelope (Taurotragus oryx). In the first experiment, two ejaculates were collected 10 minutes apart from each of five rams three times a week for three weeks to maximize output and minimize handling time. Semen volume, concentration and total number of spermatozoa were significantly greater in first ejaculates, whereas pre-cooled, cooled and post-thaw motility, as well as sperm survival, were greater in second ejaculates. …
Biology And Chemical Ecology Of The Sugarcane Beetle And Integrated Pest Management Of Sweet Potato Soil Insects In Louisiana, Tara Parker Smith
Biology And Chemical Ecology Of The Sugarcane Beetle And Integrated Pest Management Of Sweet Potato Soil Insects In Louisiana, Tara Parker Smith
LSU Doctoral Dissertations
Host plant preference and chemical ecology of the sugarcane beetle, Euetheola humilis were evaluated in greenhouse and laboratory studies. Sweet potato, Ipomoea batatas, was significantly preferred over all other plant species evaluated in a host plant preference test. Corn, Zea mays, and sugarcane, Saccharum spp., were the next most chosen plant species in the study. In olfactometer experiments, sugarcane beetles responded significantly more to beetle injured and mechanically injured roots vs. uninjured roots. Male and female beetles were also significantly more attracted to female conspecifics. Differences were not detected between sweet potato cultivars in olfactometer trials. Cultivar preference studies suggested …
Cryopreservation And Intracytoplasmic Sperm Injection With Bovine Epididymal Spermatozoa, Carlos Andres Guerrero
Cryopreservation And Intracytoplasmic Sperm Injection With Bovine Epididymal Spermatozoa, Carlos Andres Guerrero
LSU Doctoral Dissertations
Recently, interest in the preservation of epididymal sperm as a potential source of valuable genes for genome resource banks has escalated. The development of a successful protocol to recover and cryopreserve sperm harvested from the epididymides would salvage germplasm from genetically valuable males that are injured and can no longer mate or have unexpectedly died and can be used as a model for the preservation of male gametes from endangered species. In a series of experiments, epididymal sperm was successfully harvested, cryopreserved and used for intracytoplasmic sperm injection. In Experiment I, ethylene glycol was found to cause significantly (P<0.05) less osmotic damage to bovine sperm during a one step addition and/or removal at 4°C as compared with glycerol in all concentrations evaluated. Furthermore, prolonged exposure (5 days at 4°C) of ethylene glycol was found to be less toxic than glycerol to sperm. In Experiment II, it was demonstrated that glycerol was more effective than ethylene glycol in providing protection against freezing injury during the cryopreservation process in the concentrations evaluated. In Experiment III, it was demonstrated that epididymal sperm retrieval using seminal plasma is beneficial to enhance sperm overall and progressive motility characteristics and to protect it from morphological abnormalities derived from the freezing process. In Experiment IV, a one step dilution process for removal of glycerol from cryopreserved epididymal sperm was found to significantly affect plasma membrane integrity and mitochondrial function of sperm previously exposed to seminal plasma. However, seminal plasma exposure did not have any significant detrimental effect on acrosome integrity. Furthermore, it was demonstrated that the longevity and survivability in vitro during a 4-hour incubation period at 37°C of post-thaw epididymal sperm exposed to seminal plasma prior to cryopreservation was not compromised when compared with the control extended sperm. In Experiment V, we have demonstrated that fertilization, blastocyst and fetal development could be achieved with cryopreserved bovine epididymal sperm by intracytoplasmic sperm injection (ICSI). To our knowledge, this is the first report in the United States and second in the world to use bovine epididymal sperm for ICSI. We achieved far markedly improved blastocyst rates over those results recently reported in the first study originating in Japan.
Measuring The Degree Of Market Power In The Export Demand For Soybean Complex, Dwi Susanto
Measuring The Degree Of Market Power In The Export Demand For Soybean Complex, Dwi Susanto
LSU Doctoral Dissertations
Previous studies on market power hypothesis strictly assumed that the data used in the analysis were a stationary process. This assumption has been argued that not all time series exhibit a stationary process such that conventional asymptotic theory cannot be applied. This study adopts the “New Empirical Industrial Organization” (NEIO) approach developed by Bresnahan (1982) and Lau (1982) to measure the degree of market power in the export market for soybean complex. The non-stationary properties of the data were accommodated by formulating the model in an error correction framework (ECM) developed by Bårdsen (1989) and applied by Steen and Salvanes …
Examination Of The Constructs Of The Transtheoretical Model In Patients With Heart Failure: A Focus On Physical Activity Readiness, Tracie Rena Parish
Examination Of The Constructs Of The Transtheoretical Model In Patients With Heart Failure: A Focus On Physical Activity Readiness, Tracie Rena Parish
LSU Doctoral Dissertations
The goal of this research was to gain greater understanding about the management of heart failure patients. A particular focus was to evaluate exercise tolerance and behavior. The major findings of the first study included: (1) evidence that few heart failure patients receive adequate information regarding physical activity; (2) performance on a six-minute walk test were ~42% lower, and SF-36 scores were also lower in heart failure patients compared to controls; (3) stability in hemodynamic measures and distance walked on the 6-minute walk test were adequate, and (4) home exercise resulted in 19% improvement in maximum walking distance and 30% …