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Full-Text Articles in Life Sciences

Export-Led Growth In Southern Africa, Ramona Sinoha-Lopete Jan 2006

Export-Led Growth In Southern Africa, Ramona Sinoha-Lopete

LSU Master's Theses

The objective of this thesis was to examine the validity of the Export-Led Growth (ELG) hypothesis in nine Southern African countries using annual data for the period 1980-2002. The thesis used time series econometric techniques to test for the causal linkage between exports and economic growth in Southern Africa. Dynamic econometric models were estimated to test for time series properties: unit root (ADF and PP tests), cointegration (Johansen’s procedure), and Granger-causality (Likelihood Ratio test-LR). The results of the unit root tests show that most of the series are stationary in first differences (series in levels have unit root—I(1)). Co-integration and …

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The Effects Of Perceptions On Consumer Acceptance Of Genetically Modified (Gm) Foods, Jae-Hwan Han Jan 2006

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 …

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The Effects Of Micronutrients On Pullets And Broilers, Danielle Armantine Lauzon Jan 2006

The Effects Of Micronutrients On Pullets And Broilers, Danielle Armantine Lauzon

LSU Master's Theses

Two experiments were conducted to determine the availability of various vitamin E (E) sources (absorbed to verxite or adsorbed to silica) in broilers. In Experiment 1, at 100 and 300 IU supplemental E, an average of 94 and 44% of E intake from verxite and silica, respectively, was excreted in the feces, but at 30 IU E, 49 and 45% of E intake was excreted in the feces. In Experiment 2 at 30 IU, 52 and 43% of E intake from verxite and silica was excreted (source, P < 0.02). Based on these results, E adsorbed to silica is more available. Two experiments were conducted to determine the relative bioavailability of organic versus inorganic sources of either Mn or Zn. In Experiment 1, Mn as MnSO4 or a Mn amino acid complex (Availa-Mn) were compared. In Experiment 2, ZnSO4 or a Zn amino acid complex (Availa-Zn) were compared. The results indicate that Availa-Mn is a more available source of Mn than MnSO4, but Availa-Zn is not as available as a source of Zn as ZnSO4. An experiment was conducted to determine the effects of organic sources of Zn, Mn, and Cu on White Leghorn pullet performance. Treatment diets consisted of a control diet with 66 ppm Zn as ZnSO4 or a combination of ZnSO4 and Availa-Zn, 66ppm Mn as MnSO4 or a combination of MnSO4 and Availa-Mn, and 10 ppm Cu as CuSO4 or a combination of CuSO4 and a Cu amino acid complex (Availa-Cu). Diets are inorganic sources (IO), organic Zn (OZ), organic Zn and Mn (OZM), or organic Zn, Mn, and Cu (OZMC). Addition of OZM increased (P < 0.08) intestinal tensile strength and increased (P < 0.06) grams of ash per bone compared with OZMC. Pullets fed OZ had a higher (P < 0.08) bone concentration of all minerals than pullets fed OZM. Total tibia Mn was decreased (P < 0.06) by OZMC, but total tibia Cu was increased (P < 0.08) by OZ addition over IO or OZM.

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Gamete And Cell Technologies For Use In Biological Resource Banking, Liesl Nel-Themaat Jan 2006

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. …

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Biology And Chemical Ecology Of The Sugarcane Beetle And Integrated Pest Management Of Sweet Potato Soil Insects In Louisiana, Tara Parker Smith Jan 2006

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 …

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Self-Regulation In Physical Activity: Understanding Decisions That Older Adults Make, Janene Marie Grodesky Jan 2006

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 …

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The Effect Of A Condensed Tannin Containing Forage, Sericea Lespedeza On Existing And Challenge Infections Of Haemonchus Contortus In Sheep, Leigh Ann Chafton Jan 2006

The Effect Of A Condensed Tannin Containing Forage, Sericea Lespedeza On Existing And Challenge Infections Of Haemonchus Contortus In Sheep, Leigh Ann Chafton

LSU Master's Theses

Haemonchus contortus is one of the most threatening parasites to small ruminant production. Control has traditionally relied on the use of anthelmintics. Control has waned because the worm population has developed resistance to most of the currently available anthelmintics and alternative control measures are needed. Current consumer pressure is to reduce the use of chemicals in agricultural products, thus pushing control methods to more natural and acceptable approaches. One such approach is the feeding of condensed tannin containing forages either as fresh forage or dried products (hay, meal, pellets, etc). This study was conducted to determine the effect of a …

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The Effects Of Carbonated Marinade On The Shelf Life Of Enhanced Pork, Maria Ofelia Guerra Jan 2006

The Effects Of Carbonated Marinade On The Shelf Life Of Enhanced Pork, Maria Ofelia Guerra

LSU Master's Theses

Brine incorporation into meat products has become a well established practice in the United States. Brines are used to enhance the eating quality of pork by improving its tenderness and juiciness. Carbon dioxide and carbon monoxide have been used in modified atmosphere packaging as antimicrobial agents and color stabilizers, respectively, to increase the shelf life of retail meats. The objective of this experiment was to analyze the effects of incorporating carbon dioxide and carbon monoxide into brine solutions to subsequently inject into raw chilled pork. Pork loins were injected with brine solutions containing 2.27% phosphates, 3.79% salt and dissolved gas …

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Analysis Of Consumer Attitudes And Their Willingness To Pay For Functional Foods, Cate Nakaweesa Munene Jan 2006

Analysis Of Consumer Attitudes And Their Willingness To Pay For Functional Foods, Cate Nakaweesa Munene

LSU Master's Theses

Survey data collected from randomly selected participants within the four geographical regions of the U.S. were used to evaluate consumer attitudes towards functional foods and determine their willingness to pay for these foods. Contingent valuation using the payment card method was used to elicit premiums that consumers are willing to pay for a spread that maintains a healthy heart (spread A), a spread that is proven to significantly reduce cholesterol (spread B) and a loaf of bread that may reduce the risk of heart disease and certain cancers (bread A). Ordered probit regression analysis was used to evaluate the effect …

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A Semiparametric Assessment Of Export-Led Growth In The Philippines, Lorna E. Amrinto Jan 2006

A Semiparametric Assessment Of Export-Led Growth In The Philippines, Lorna E. Amrinto

LSU Master's Theses

This study contributes to the literature on the export-led growth (ELG) hypothesis by adopting a semiparametric approach under two levels of temporal aggregation to investigate the ELG hypothesis in the Philippines. To assess the impact of model specification on the ELG hypothesis, parametric and semiparametric ECMs are estimated using Philippine annual and quarterly data on GDP, exports, exchange rates and gross fixed-capital formation, focusing on the role of exchange rates. The causal relationship between exports and economic growth is examined using the Granger-causality procedure. It can be concluded that for the Philippines, the ELG hypothesis is (a) sensitive to model …

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Understanding Parents' Decisions About Serving Vegetables To Their Children, Alissa Villarrubia Jan 2006

Understanding Parents' Decisions About Serving Vegetables To Their Children, Alissa Villarrubia

LSU Master's Theses

With the increasing rate of childhood obesity it is important to examine obesity prevention programs and strategies. The theory of planned behavior (TPB) has been identified as a successful framework to examine and understand human behavior and obesity prevention research. However, there is limited support for the TPB regarding its use and efficacy for understanding parents’ influence on the health behavior of their children. The purpose of this study was to: (a) describe the most common behavioral, normative, and control beliefs of parents’ serving vegetables to their children; (b) examine the social cognitive correlates of parents’ intentions to serve vegetables …

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Control Of Listeria Species And Other Bacteria In Crawfish And Crab Processing Facilities, Utilizing Copper Drains, Coatings And Concrete, Containing Copper Ions, Artem S. Rogovskyy Jan 2006

Control Of Listeria Species And Other Bacteria In Crawfish And Crab Processing Facilities, Utilizing Copper Drains, Coatings And Concrete, Containing Copper Ions, Artem S. Rogovskyy

LSU Master's Theses

The antibacterial properties of copper ions against Listeria spp., Pseudomonas spp., Escherichia coli and other coliforms, and total aerobic bacteria have been investigated in seafood processing environments. Our hypothesis was that drains fabricated from copper and coatings and concrete containing copper ions that have been used for sealing floors and walls could be utilized in crawfish and crab processing facilities as an effective means of controlling Listeria spp. and other unwanted bacteria. Copper in the form of copper sulfate pentahydrate was incorporated into coatings and concrete at the salt concentration of 25 ppm (6.36 ppm Cu++). Sampling sites were selected …

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Agrobacterium Tumefaciens-Mediated Transformation Of Tobacco (Nicotiana Tabacum L.) Leaf Disks: Evaluation Of The Co-Cultivation Conditions To Increase Beta-Glucuronidase Gene Activity, Sunjung Park Jan 2006

Agrobacterium Tumefaciens-Mediated Transformation Of Tobacco (Nicotiana Tabacum L.) Leaf Disks: Evaluation Of The Co-Cultivation Conditions To Increase Beta-Glucuronidase Gene Activity, Sunjung Park

LSU Master's Theses

Agrobacterium tumefaciens-mediated transformation is generally used for genetic transformation of higher plants. Several experimental factors important for the increase of beta-glucuronidase (GUS) reporter gene activity were evaluated in this study using leaf disks of tobacco (Nicotiana tabacum L. cv. Xanthi). We found that co-cultivation temperature at 20C is the most critical factor to obtain the reproducible enhancement of GUS activity. pCAMBIA 1305.01 resulted in higher GUS activity than the other two pCAMBIA vectors 1301 and 1305.02. The highest GUS activity and transformation efficiency were achieved under the following experimental conditions: Agrobacterium tumefaciens strain LBA4404 containing pCAMBIA1305.01 was grown overnight at …

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Comparing Bermudagrass And Bahiagrass Cultivars At Different Stages Of Harvest For Dry Matter Yield And Nutrient Content, Ryan Thomas Dore' Jan 2006

Comparing Bermudagrass And Bahiagrass Cultivars At Different Stages Of Harvest For Dry Matter Yield And Nutrient Content, Ryan Thomas Dore'

LSU Master's Theses

Rapid growth of warm-season grasses such as bermudagrass (Cynodon dactylon) and bahiagrass (Paspalum notatum) is associated with a decline in their nutritional value. This study was initiated to provide production and composition data with different cultivars of bermudagrass (common, Russell, Jiggs) and bahiagrass (Tifton-9, Pensacola, Argentina). Dry matter (DM), ash, crude protein (CP), neutral detergent fiber (NDF), and acid detergent fiber (ADF) composition and production were evaluated every two weeks for a ten-week period on six different cultivars. Also, Russell bermudagrass was evaluated in a second trial very similar to the first trial for composition and production but was started …

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Analysis Of U.S. Aquacultural Producer Preferences For Genetic Improvement And Cryopreservation, Brian Paul Boever Jan 2006

Analysis Of U.S. Aquacultural Producer Preferences For Genetic Improvement And Cryopreservation, Brian Paul Boever

LSU Master's Theses

Aquaculture industries in the U.S. generate $1 billion in farm-level sales. Genetic improvement of fish stocks may be a way to increase the market share of aquaculture within the U.S. seafood market as well as the market share within the world market. This study evaluates the preferences, beliefs, and opinions of aquaculture producers across the U.S. about topics such as cryopreservation, genetic improvement, and the future of the aquaculture industry. Willingness-to-pay values for specific genetic improvements by aquaculture grow-out producers were elicited. A national survey of aquaculture producers was used to elicit the information used in the analysis. The survey …

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Determination Of Antioxidant Capacity In Corn Germ, Wheat Germ And Wheat Bran Using Solvent And Microwave-Assisted Solvent Extraction, David Swenson Oufnac Jan 2006

Determination Of Antioxidant Capacity In Corn Germ, Wheat Germ And Wheat Bran Using Solvent And Microwave-Assisted Solvent Extraction, David Swenson Oufnac

LSU Master's Theses

ABSTRACT Solvent extraction methods are widely used for extracting antioxidant in foods and other sources. In this study, Traditional Solvent Extraction (TSE) and Microwave-Assisted Solvent Extraction (MASE) were utilized to determine the content of antioxidants in corn germ, wheat bran and wheat germ. Corn germ, wheat bran and wheat germ all contain different levels of antioxidants; TSE and MASE were utilized to determine the content of antioxidants in these three samples. TSE was performed at 60 ¨¬C employing three solvents, acetone, hexane and methanol. MASE was performed using the solvent methanol at four different temperatures, 60, 80, 100 and 120 …

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Antimicrobial Activity Of Cpc And Asc Against Foodborne Pathogens And The Physiological Effect On Fresh-Cut Cantaloupe Cubes At Refrigerator Temperatures, Allison Marie Dumas Jan 2006

Antimicrobial Activity Of Cpc And Asc Against Foodborne Pathogens And The Physiological Effect On Fresh-Cut Cantaloupe Cubes At Refrigerator Temperatures, Allison Marie Dumas

LSU Master's Theses

In the last few decades, fresh-cut fruit products have gained popularity with consumers. They require little to no further processing prior to consumption. Fresh-cut products also make fruits and vegetables more conveniently available to consumers year-round. There are limitations, however, to fresh-cut fruit and vegetables in the marketplace. These products are very perishable and could become contaminated with foodborne pathogens. Most fresh-cut fruits and vegetables will only last a short period of time at refrigerator temperatures. There are many possible routes of bacterial contamination in the fresh-cut produce industry. There is a need for antimicrobial compounds that can be applied …

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Awareness Of The Environmental Quality Incentives Program And Subsequent Adoption Of Best Management Practices By Cattle Farmers In Louisiana, Joyce Mamle Obubuafo Jan 2006

Awareness Of The Environmental Quality Incentives Program And Subsequent Adoption Of Best Management Practices By Cattle Farmers In Louisiana, Joyce Mamle Obubuafo

LSU Master's Theses

In recent years, the US livestock industries have undergone structural changes that have led to larger livestock operations with their associated environmental problems. Louisiana is within one of the major cow-calf production areas in the US (the Southeast). Louisiana accounts for about 1.72% of the total US cattle operations. In an attempt to control degradation of the environment, conservation programs have been put in place, one of which is the Environmental Quality Incentives Program (EQIP). The EQIP was established in the 1996 Farm Bill, involving the payment of government subsidies to landowners willing to implement specific cost-intensive conservation practices. The …

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Interactions Between Formosan Subterranean Termites, Brown Rot Fungus (Gloeophyllum Trabeum) And Some Of The Fungi Present On The Termite Integument And Gut, Poornima Jayasimha Jan 2006

Interactions Between Formosan Subterranean Termites, Brown Rot Fungus (Gloeophyllum Trabeum) And Some Of The Fungi Present On The Termite Integument And Gut, Poornima Jayasimha

LSU Master's Theses

Although the brown rot fungus, Gloeophyllum trabeum (Pers.:Fr.) Murrill, has been shown to be attractive and beneficial to subterranean termites, including Coptotermes formosanus Shiraki, to date no research has been conducted to determine if the association is mutualistic. We first set out to determine if the fungus could be spread by termites. This would represent an obvious benefit to the fungus. We found that C. formosanus does not spread G. trabeum. Unexpectedly, Formosan subterranean termites were found to suppress the growth of G. trabeum. To further investigate this finding, Formosan subterranean termite workers were released into Petri dishes with wood …

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Examination Of Blood Flow Using Vasoconstrictor And Vasodilator Stimuli: Stability And Reproducibility, Robert B. Lestage Jan 2006

Examination Of Blood Flow Using Vasoconstrictor And Vasodilator Stimuli: Stability And Reproducibility, Robert B. Lestage

LSU Master's Theses

Blood flow distribution relies on the vasculature’s ability to vasodilate and vasoconstrict throughout the body. Most previous research has focused on only one of these abilities, either vasodilation or vasoconstriction. For example, Thijssen et al. (2005) focused their research on vasodilation by studying reactive hyperemia, while Kinuyoshi et al. (2003) studied the possible vasoconstriction effect with increasing muscle sympathetic nerve activity. The purpose of this study was to assess vascular function using a variety of stimuli to potentially learn more about overall vascular health, while determining the stability and reliability of blood flow measurements using strain gauge plethysmography. Measures of …

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Depolymerization And Decolorization Of Chitosan By Ozone Treatment, Seung-Wook Seo Jan 2006

Depolymerization And Decolorization Of Chitosan By Ozone Treatment, Seung-Wook Seo

LSU Master's Theses

Currently, depolymerization and decolorization of chitosan are achieved by chemical or enzymatic methods which are time consuming and expensive. Ozone has been shown to be able to degrade macromolecules and remove pigments due to its high oxidation potential. In this study, the effects of ozone treatment on depolymerization and decolorization of chitosan were investigated. Crawfish chitosan was ozonated in water and acetic acid solution for 0, 5, 10, 15, and 20 minutes at room temperature with 12wt% gas. For the determination of viscosity–average Molecular weight of chitosan, an ubbelohde viscometer was used to measure the intrinsic viscosity, and the Mark-Houwink …

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Biomechanical Characteristics Of Low Back Tissues During Trunk Flexion-Extension, Michael William Olson Jan 2006

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 …

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Evaluation Of A Plasmid Delivery System For Production Of Gnrh And Ghrh In The Horse And Goat, William Andrew Storer Jan 2006

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 …

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Physical Activity Behavior Of University Students: An Ecological Approach, Lisa Gaye Johnson Jan 2006

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 …

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Vitrification And Dehydration For The Preservation Of Gametes, Allison E. Moisan Jan 2006

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 …

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Self-Determination In Injury Rehabilitation: Designing A Climate For Promoting Adherence, Ryan Mark Green Jan 2006

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 …

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Assessment Of Interactions Amoung Viruses Infecting Sweetpotato, Charalambos D. Kokkinos Jan 2006

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 …

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Phenolic Compounds And Antioxidant Activity Of Oat Bran By Various Extraction Methods, Darryl Lourey Holliday Jan 2006

Phenolic Compounds And Antioxidant Activity Of Oat Bran By Various Extraction Methods, Darryl Lourey Holliday

LSU Master's Theses

Recent studies have suggested that the health promoting capabilities of oats are due to its antioxidants (tocopherols, tocotrienols, and sterols) found within the bran along with phenolic compounds, such as avenanthramides, p-hydroxybenoic acid and vanillic acid. Long-chain fatty acid oxidation is directly responsible for most off-flavors in food. Since oat bran is a good source of antioxidants, a concentrated extract could be used as a natural preservative, for foods rich in unsaturated long-chain fatty acids. Three methods, traditional solvent (TSE), microwave-assisted solvent (MAS), and supercritical fluid treatment (SFT), were used to obtain the extracts. One extraction temperature in TSE, 60°C, …

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Sensory Characteristics Of Salt Substitute Containing L-Arginine, Pamarin Waimaleongora-Ek Jan 2006

Sensory Characteristics Of Salt Substitute Containing L-Arginine, Pamarin Waimaleongora-Ek

LSU Master's Theses

Dietary salt restriction is a common approach recommended by physicians in the treatment and prevention of hypertension. Salt substitute is a potential alternative. The most popular salt substitute is KCl, having similar physical properties to NaCl. Because of the higher molecular weight of cations (K+), KCl imparts undesired bitterness and metallic aftertaste. L-arginine has been found to have the bitterness-suppression property. Therefore, it may be used in the mixture of salt substitutes. In the first study, NaCl and four salt substitute solutions consisting of KCl, NaCl, and L-arginine, were developed at 0.5%, 1%, and 1.5% w/v. A discriminative test was …

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Effect Of Light Intensity And Weld Thickness On The Performance Of Uv-Cured Frp Composite Joints, Jerry Alan Peck Jan 2006

Effect Of Light Intensity And Weld Thickness On The Performance Of Uv-Cured Frp Composite Joints, Jerry Alan Peck

LSU Master's Theses

Thirty-six FRP composite welds were wetted with UV curing vinyl ester resin and used to join fiberglass tubes. The effects of UV light intensity and weld thickness on performance (as measured by bursting pressure and stiffness) were evaluated to determine optimal conditions for joint construction. The joined composite pipes were cured vertically with UV lamps at three different light intensities, 80 mW/cm2, 35 mW/cm2 and 15 mW/cm2 to isolate the effect of UV light intensity. Eight-layer, five-layer and three-layer joints were prepared and cured at constant light intensity to evaluate the effect of reducing the thickness of the composite joint. …

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