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Diverse Elevational Diversity Gradients In Great Smoky Mountains National Park, U.S.A., Nathan J. Sanders, Robert R. Dunn, Matthew C. Fitzpatrick, Christopher E. Carlton, Michael R. Pogue, Charles R. Parker, Theodore R. Simons Jan 2009

Diverse Elevational Diversity Gradients In Great Smoky Mountains National Park, U.S.A., Nathan J. Sanders, Robert R. Dunn, Matthew C. Fitzpatrick, Christopher E. Carlton, Michael R. Pogue, Charles R. Parker, Theodore R. Simons

Faculty Publications

© 2010 by Taylor and Francis Group, LLC. Less well studied, however, are the factors that shape elevational diversity gradients. Because many climatic factors vary systematically along elevational gradients, as they might along latitudinal gradients, elevational diversity gradients were thought to be miniature versions of latitudinal gradients (Körner, 2000). For example, Brown (1988) wrote, “Just as change of physical conditions with altitude resembles in many respects the variation with latitude, so the decreasing diversity of most organisms with increasing elevation mirrors in most respects the latitudinal gradient of species richness.” Stevens (1992) noted that, “Biologists have long recognized that elevational …

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Louisiana Agriculture Winter, 2009 Jan 2009

Louisiana Agriculture Winter, 2009

Louisiana Agriculture

No abstract provided.

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Sos1 And Halophytism., Dong Ha Oh, Ali Zahir, Dae Jin Yun, Ray A. Bressan, Hans J. Bohnert Jan 2009

Sos1 And Halophytism., Dong Ha Oh, Ali Zahir, Dae Jin Yun, Ray A. Bressan, Hans J. Bohnert

Faculty Publications

Much is already known about the function and functioning of the three genes that make up the SOS (Salt-Overly-Sensitive) pathway in plants, but recent studies indicate that the linkage between external increases in salinity and stress protection provided by genes SOS1, SOS2 and SOS3 is more complex than previously appreciated. It has recently been shown that the engineered reduced expression of the sodium/proton antiporter SOS1 affected several pathways indicating a role for SOS1 that exceeds its known function as an antiporter. Interference with expression of SOS1, characterized as a sodium/proton antiporter in the halophyte Thellungiella salsuginea converted Thellungiella into an …

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Adipose Tissue Collagen Vi In Obesity, Magdalena Pasarica, Barbara Gowronska-Kozak, David Burk, Isabel Remedios, David Hymel, Jeff Gimble, Eric Ravussin, George A. Bray, Steven R. Smith Jan 2009

Adipose Tissue Collagen Vi In Obesity, Magdalena Pasarica, Barbara Gowronska-Kozak, David Burk, Isabel Remedios, David Hymel, Jeff Gimble, Eric Ravussin, George A. Bray, Steven R. Smith

Faculty Publications

Objectives: Basic science studies show that the extracellular matrix of adipose tissue, mainly represented by collagen VI, is dysfunctional in obesity and contributes to the development of the metabolic syndrome. We hypothesized in humans that increased collagen VI α3-subunit (COL6A3) mRNAis associated with adipose tissue macrophage chemotaxis and inflammation and that weight gain is accompanied by changes in the expression of COL6A3. Research Design and Methods: Adipose tissue biopsies were obtained from a cross-sectional study (n = 109), an overfeeding study (n = 9), and a pioglitazone treatment study (n = 14). Adipose tissue gene expression was measured by quantitative …

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Obesity Management In Adults With Ckd, Holly Kramer, Katherine R. Tuttle, David Leehey, Amy Luke, Ramon Durazo-Arvizu, David Shoham, Richard Cooper, Srinvisan Beddhu Jan 2009

Obesity Management In Adults With Ckd, Holly Kramer, Katherine R. Tuttle, David Leehey, Amy Luke, Ramon Durazo-Arvizu, David Shoham, Richard Cooper, Srinvisan Beddhu

Faculty Publications

All adults, including those with and without CKD, should receive counseling on the benefits of a healthy lifestyle, which includes a healthy diet, physical activity, and smoking cessation. In people with CKD who are overweight, but not obese, potential benefits of weight loss to the recommended "ideal" range are uncertain. Nevertheless, obesity is associated with increased inflammation, insulin resistance, hypertension, and dyslipidemia, and overweight adults with CKD should be counseled about the risks of weight gain. In persons with CKD and generalized or abdominal obesity, weight loss should be encouraged. For patients on dialysis therapy, survival can be greatly increased …

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Energy Expenditure Does Not Predict Weight Change In Either Nigerian Or African American Women, Amy Luke, Lara R. Dugas, Kara Ebersole, Ramon A. Durazo-Arvizu, Guichan Cao, Dale A. Schoeller, Adebowale Adeyemo, William R. Brieger, Richard S. Cooper Jan 2009

Energy Expenditure Does Not Predict Weight Change In Either Nigerian Or African American Women, Amy Luke, Lara R. Dugas, Kara Ebersole, Ramon A. Durazo-Arvizu, Guichan Cao, Dale A. Schoeller, Adebowale Adeyemo, William R. Brieger, Richard S. Cooper

Faculty Publications

Background: The relation between variation in interindividual levels of energy expenditure and weight gain remains controversial. Objective: To determine whether or not components of the energy budget predict weight change, we conducted an international comparative study in 2 cohorts of women from sociocultural environments that give rise to the extremes of obesity prevalence. Design: This was a prospective study with energy expenditure measured at baseline and weight measured annually for 3 y. Participants included 149 women from rural Nigeria and 172 African American women. The energy budget was determined by using respiratory gas exchange and doubly labeled water. Main outcomes …

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Reaction Of Potato Cultivars To Streptomyces Scabies, Causal Agent Of Deep Common Scab, Ivan Herman Fischer, Ana Paula Matoso Teixeira, Leonardo Toffano, Ely Oliveira Garcia Jan 2009

Reaction Of Potato Cultivars To Streptomyces Scabies, Causal Agent Of Deep Common Scab, Ivan Herman Fischer, Ana Paula Matoso Teixeira, Leonardo Toffano, Ely Oliveira Garcia

Faculty Publications

This work aimed to characterize the isolates of Streptomyces, responsible for deep common scab symptoms in potato, according to morphological and physiological criteria; to evaluate the resistance of potato cultivars to the disease and the aggressiveness of bacterium isolates. The Streptomyces isolates presented gray coloration on yeast extract and malt medium and spiral spore chains, produced on aerial hyphae. Production of melanina occurred in tirosine-agar medium and the utilization of eight recommended carbon sources. These properties correspond to the S. scabies species. Healthy potato seeds of six cultivars were planted in substratum infested with six isolates of S. scabies separately, …

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Sperm Cryopreservation Of A Live-Bearing Fish, Xiphophorus Couchianus: Male-To-Male Variation In Post-Thaw Motility And Production Of F1 Hybrid Offspring, Huiping Yang, Leona Hazlewood, Ronald B. Walter, Terrence R. Tiersch Jan 2009

Sperm Cryopreservation Of A Live-Bearing Fish, Xiphophorus Couchianus: Male-To-Male Variation In Post-Thaw Motility And Production Of F1 Hybrid Offspring, Huiping Yang, Leona Hazlewood, Ronald B. Walter, Terrence R. Tiersch

Faculty Publications

Fishes of the genus Xiphophorus are well-studied biomedical research models, and some species, such as X. couchianus, are currently listed as endangered in the wild. Sperm cryopreservation in these live-bearing fishes has begun recently. Thus far, live young have been produced with cryopreserved sperm only in one species (Xiphophorus helleri). In this study, the goal was to develop a practical protocol for sperm cryopreservation of Xiphophorus couchianus, and to produce live young with cryopreserved sperm. Sperm were collected by crushing of testis in Hanks' balanced salt solution at an osmolality of 500 mOsmol/kg (HBSS500), and were cryopreserved with 14% glycerol …

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Current Status Of Sperm Cryopreservation In Biomedical Research Fish Models: Zebrafish, Medaka, And Xiphophorus, Huiping Yang, Terrence R. Tiersch Jan 2009

Current Status Of Sperm Cryopreservation In Biomedical Research Fish Models: Zebrafish, Medaka, And Xiphophorus, Huiping Yang, Terrence R. Tiersch

Faculty Publications

Aquarium fishes are becoming increasingly important because of their value in biomedical research and the ornamental fish trade, and because many have become threatened or endangered in the wild. This review summarizes the current status of sperm cryopreservation in three fishes widely used in biomedical research: zebrafish, medaka, and live-bearing fishes of the genus Xiphophorus, and will focus on the needs and opportunities for future research and application of cryopreservation in aquarium fish. First, we summarize the basic biological characteristics regarding natural habitat, testis structure, spermatogenesis, sperm morphology, and sperm physiology. Second, we compare protocol development of sperm cryopreservation. Third, …

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Developing A Food Exchange List For Middle Eastern Appetisers And Desserts Commonly Consumed In Jordan, Hiba A. Bawadi, Naseem M. Al-Shwaiyat, Reema F. Tayyem, Rania Mekary, Georgianna Tuuri Jan 2009

Developing A Food Exchange List For Middle Eastern Appetisers And Desserts Commonly Consumed In Jordan, Hiba A. Bawadi, Naseem M. Al-Shwaiyat, Reema F. Tayyem, Rania Mekary, Georgianna Tuuri

Faculty Publications

Aim: The present study was conducted to develop a meal-planning exchange list for Middle Eastern foods commonly included in the Jordanian cuisine. Methods: Forty types of appetisers and another 40 types of desserts were selected, with five different recipes for each item. Recipes were collected from different housewives and Arabic cookbooks. Ingredients' weight and dish net weight were recorded based on an average recipe, and dishes were prepared accordingly. Dishes were proximately analysed following the Association of Official Analytical Chemists procedures. Proximate analysis was compared with the World Health Organisation Food Composition Tables for the Use in the Middle East, …

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Evaluating The Influence Of Educational Videos And Printed Materials On Office Of Family Support Clients' Intentions To Select, Purchase, Prepare, And Consume Healthier Foods, Natasha Dee Pittman Jan 2009

Evaluating The Influence Of Educational Videos And Printed Materials On Office Of Family Support Clients' Intentions To Select, Purchase, Prepare, And Consume Healthier Foods, Natasha Dee Pittman

LSU Master's Theses

Supplemental Nutrition Assistance Program Education (SNAP-Ed) is essential in providing eligible households with the right tools to adopt healthy eating and active lifestyle practices which are consistent with the Dietary Guidelines for Americans and MyPyramid. Education in the OFS, where SNAP eligibility is assessed, is one means to preventing adversities which those in poverty often face. Out of concern for the lack of nutrition education being conducted in the OFS, along with the many distractions limiting clients’ ability to absorb and retain educational messages, the Food Stamp Office Resource Kit (FSORK) was developed. The FSORK includes a 20 minute video …

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Moving Over Mountains: A Woman On The Appalachian Trail, Jessica Susan Matthews Jan 2009

Moving Over Mountains: A Woman On The Appalachian Trail, Jessica Susan Matthews

LSU Master's Theses

This project examines the experience of a woman on the Appalachian Trail. It is my aim in undertaking this project to evaluate my own personal experiences in order to explore the way the Appalachian Trail is conceptualized as a space, and then experienced as a place. My own experiences will be connected to and contrasted by experiences I have with other hikers. It is through my own experiences and those of others that I hope to highlight the ways that spaces and mobilities are gendered in our society and the ways that those expectations are usurped. The wilderness might be …

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The Additive Effect Of Melengestrol Acetate (Mga) Priming And Sodium Monensin On Reproductive Performance In Beef Heifers, Jonathan Lance Roberts Jan 2009

The Additive Effect Of Melengestrol Acetate (Mga) Priming And Sodium Monensin On Reproductive Performance In Beef Heifers, Jonathan Lance Roberts

LSU Master's Theses

Breeding beef heifers to produce calves at 2 years of age could be a profitable management decision. The current practices have proved inefficient, which has justified further research in the area. The objective of this study was to examine the effects of repeated progestogen priming on the attainment of puberty by prepubertal heifers, to evaluate the potential additive effect of progestogen priming plus sodium monensin on the attainment of puberty by prepubertal heifers, to examine subsequent reproductive performance, including the response to synchronization of the estrous cycle, first-service pregnancy rates and overall pregnancy rates and to examine the effects of …

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The Hyperinsulinemia-Hyperleptinemia Syndrome In Horses: Assessment Of Methods Of Diagnosis And Differential Effects Of Insulin Injection On Glucose, Glucagon And Nonesterified Fatty Acids In Plasma, Thomas Joseph Caltabilota Jan 2009

The Hyperinsulinemia-Hyperleptinemia Syndrome In Horses: Assessment Of Methods Of Diagnosis And Differential Effects Of Insulin Injection On Glucose, Glucagon And Nonesterified Fatty Acids In Plasma, Thomas Joseph Caltabilota

LSU Master's Theses

Plasma leptin concentrations in horses have been shown to vary widely. However, many factors may perturb these measurements. Previous research has documented a link between hyperinsulinemia and hyperleptinemia in horses. This condition has been speculated to be associated with components of equine metabolic syndrome, such as insulin resistance and laminitis. However, many of the methods accepted in diagnosing these metabolic abnormalities are expensive and often difficult to perform. Thus, the objectives of the experiments in this thesis were 1) to determine if it is possible to differentiate hyperleptinemic horses from normal ones by hormone manipulation with dexamethasone, a glucocorticoid analog; …

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The Perception Of The Louisiana Food Stamp Nutrition Education Program's Ability To Improve Diet And Other Lifestyle Measures Of Participants, Melly Suyapa Perez Garay Jan 2009

The Perception Of The Louisiana Food Stamp Nutrition Education Program's Ability To Improve Diet And Other Lifestyle Measures Of Participants, Melly Suyapa Perez Garay

LSU Master's Theses

The purpose of this study was to assess the perception of Louisiana Food Stamp Nutrition Education Program (FSNEP) participants’ diet and other lifestyle measures and their consistency with the current Dietary Guidelines for Americans and MyPyramid compared to eligible non-participants in Louisiana. The study sample included FSNEP adult participants (Group 1; n=30) and adult non-FSNEP participants (Group 2; n=26) from 5 parishes in Louisiana. Nine focus group discussions (FGD) were conducted with Group 1 (n=5) and Group 2 (n=4) participants. The FGD assessed perceptions and practice in the last six months of: (a) increasing eating fruit and vegetables, whole grains, …

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The Role Of Glucagon-Like Peptide-1 On Food Intake, Glucokinase Expression And Fatty Acid Metabolism, Hanjie Zhang Jan 2009

The Role Of Glucagon-Like Peptide-1 On Food Intake, Glucokinase Expression And Fatty Acid Metabolism, Hanjie Zhang

LSU Master's Theses

The increase in blood levels of GLP-1 with dietary resistant starch is thought to be associated with the activities of hypothalamic NPY/AgRP neurons and the gene expression of glucokinase in the ARC of the hypothalamus. Exendin-4 has been shown to be associated with fatty acid synthesis and oxidation. In this project, it was proposed that 1) food intake will be decreased in GLP-1R KO mice, the glucokinase (GK) mRNA expression in the liver and in the hypothalamus, the hypothalamic NPY mRNA expression will be up-regulated by exendin-4 treatment; and 2) exendin-4 will decrease fatty acid synthesis and increase fatty acid …

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Effects Of Plant Maturity And Bacterial Inoculum Level On The Surface Contamination And Internalization Of Escherichia Coli O157:H7 In Growing Spinach, Shuaihua Pu Jan 2009

Effects Of Plant Maturity And Bacterial Inoculum Level On The Surface Contamination And Internalization Of Escherichia Coli O157:H7 In Growing Spinach, Shuaihua Pu

LSU Master's Theses

The incidence of foodborne outbreaks linked to fresh produce has increased in the United States. Particularly noteworthy was the 2006 Escherichia coli O157:H7 outbreak associated with pre-packaged baby spinach. Factors affecting the contamination of spinach leaves with E. coli O157:H7 are not yet well understood. This study aimed to determine whether E. coli O157:H7 would be present in the aerial leaf tissue of a growing spinach plant when introduced at various plant maturities and different inoculum levels in the growth media in a greenhouse setting. Spinach seeds of a standard commercial variety were sown individually in 8-inch pots, watered daily …

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Production And Application Of Antibodies Produced Against The Flagella And Hemolysin Of Vibrio Parahaemolyticus, Shreya Datta Jan 2009

Production And Application Of Antibodies Produced Against The Flagella And Hemolysin Of Vibrio Parahaemolyticus, Shreya Datta

LSU Doctoral Dissertations

Vibrio parahaemolyticus is a marine bacterium which is the leading cause of bacterial gastroenteritis due to consumption of raw or undercooked bivalve molluscan shellfish in United States and is considered an important seafood-borne pathogen throughout the world. The conventional methods for enumerating this bacteria from seafood is laborious and time consuming, hence the objective of our study was to develop antibody based method which would be sensitive, user-friendly and less time consuming to detect and enumerate Vibrio parahaemolyticus from oysters. In order to condense time and material two rapid and specific antibody based test methods were developed. In the first …

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Modification Of Rice Starch Properties By Addition Of Amino Acids At Various Ph Levels, Rosaly Vallejo Manaois Jan 2009

Modification Of Rice Starch Properties By Addition Of Amino Acids At Various Ph Levels, Rosaly Vallejo Manaois

LSU Master's Theses

Amino acids were previously found to modify starch functionalities and potentially increase starch utilization. The effect of amino acids at different pH levels on the pasting properties, thermal characteristics, and resistant starch (RS) formation of rice starch was investigated. Prior to the analyses, pretreatment of starch was done by adding amino acid (aspartic acid, leucine, lysine and tyrosine) at 6% dry weight basis and dispersing the mixture in distilled water, solutions adjusted with HCl and NaOH to pH 4, 7 and 10, and buffers of acetate, phosphate and carbonate at the same pH levels, respectively. Samples in HCl/NaOH solutions were …

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Polyunsaturated Fatty Acid Content Of Breast Milk From Women With And Without Gestational Diabetes Mellitus, Julissa Marisel Salguero Jan 2009

Polyunsaturated Fatty Acid Content Of Breast Milk From Women With And Without Gestational Diabetes Mellitus, Julissa Marisel Salguero

LSU Master's Theses

Reduced insulin sensitivity and abnormal nutrient metabolism in gestational diabetes mellitus (GDM) may compromise polyunsaturated fatty acid (PUFA) content of breast milk. The purpose of the present study was to evaluate and compare PUFA milk composition of women with and without GDM. Breast milk collections were performed in GDM (n=6) and controls (n=12) at weeks 2, 6, 10 and 12 postpartum using a hospital grade breast pump. Estimated dietary intake of PUFA and use of prenatal supplements containing DHA (PS/DHA) was determined by 24-hour dietary recalls conducted after each milk collection. Based on these preliminary data, milk docosahexaenoic acid (DHA; …

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Isoflavone Distribution In Soy Seed And Antioxidant Activity Of Defatted Soy Flour Extract, Xiaohua Yue Jan 2009

Isoflavone Distribution In Soy Seed And Antioxidant Activity Of Defatted Soy Flour Extract, Xiaohua Yue

LSU Doctoral Dissertations

Soy isoflavones distribution in soy cotelydon, coat and germ were determined. The ƒÀ-Glucoside form of isoflavones was the major class of isoflavones in all three soy parts. Soy germ was the richest source of the isoflavones among the three soybean parts. Distribution of the isoflavones in soy cotyledon was different from that in soy coat or germ. As defatted soy flour is a main byproduct in the soy oil refining process, utilizing the low value byproduct as a valuable food antioxidant was investigated in this study. The level of isoflavones in the defatted soy flour extract was 55 mg/g, which …

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Oil Platforms And Red Snapper Movement And Behavior, Michael Mcdonough Jan 2009

Oil Platforms And Red Snapper Movement And Behavior, Michael Mcdonough

LSU Master's Theses

Understanding the behavior, including movement, of red snapper (Lutjanus campechanus), around and among the many oil and gas platforms in the northern Gulf of Mexico (GOM) is crucial to the management of this important commercial and recreational species. What role oil and gas production platforms play in the attraction vs. production continuum for red snapper is unknown, but it is certain these large structures have a role at some life history stage. We used the VRAP acoustic telemetry system to track red snapper around two platforms in the GOM in 2005 and 2006. Fish detections per hour generally decreased over …

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The Interactive Effects Of Phosporus And Calcium On Phosphorus Requirement, Utilization, And Phytase Efficacy In Poultry, Syrena Powell Jan 2009

The Interactive Effects Of Phosporus And Calcium On Phosphorus Requirement, Utilization, And Phytase Efficacy In Poultry, Syrena Powell

LSU Doctoral Dissertations

This research was conducted with broilers to investigate the interactive effects of P and Ca on P requirement, digestibility, utilization, and phytase efficacy. Each treatment had a minimum of 6 replications. One experiment with 3 trials was conducted to identify the nonphytate P (nPP) requirement of 0 to 14 d old broilers. The nPP levels fed ranged from 0.30 to 0.60% with a Ca:nPP of 2.22:1 or 1.9:1. Requirement estimates for 0 to 14 d ranged from 0.52 to 0.60% nPP. One experiment with 2 trials was conducted to identify the nPP requirement of 14 to 28 d old broilers. …

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The Isolation And Characterization Of Bovine Adult Derived Adipose Stem Cells For The Use In Nuclear Transfer, Alicia A. Picou Jan 2009

The Isolation And Characterization Of Bovine Adult Derived Adipose Stem Cells For The Use In Nuclear Transfer, Alicia A. Picou

LSU Master's Theses

Since the cloning of Dolly there has been little change in the efficiency of nuclear transfer (NT). Research is beginning to investigate the characteristics of donor cells. Adiposetissue is an abundant source of adult-derived cells that have displayed “stemness” in-vitro(Gimble et al., 2003). The overall goal of this research was to define the in-vitro characteristicsof bovine adipose-derived adult stem cells (ADAS) for the use in NT. Isolation methods weredetermined by a 3 x 3 factorial design. 1 g of subcutaneous fat was collected and subjected to0.10%, 0.25% or 0.50% collagenase type I solution for 1, 2 and 3 h. Nucleated …

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Temperature Impact On Nitrification And Bacterial Growth Kinetics In Acclimating Recirculating Aquaculture Systems Biofilters, Milton Maada-Gomoh Saidu Jan 2009

Temperature Impact On Nitrification And Bacterial Growth Kinetics In Acclimating Recirculating Aquaculture Systems Biofilters, Milton Maada-Gomoh Saidu

LSU Doctoral Dissertations

This project assessed short-term temperature effects on total ammonia nitrogen (TAN) utilization rates in a batch laboratory-scale recirculating system. The tank system was designed for experiments on short term steady state and diurnal temperatures. A set of numerical models was developed to simulate observed results. The performance of the biofilters was determined with three tank replicates at fixed temperatures of 13, 20 and 300C; and at diurnal transient (sinusoidal) temperature regimes of (20 ± 30C; 30 ± 30C). Ammonia utilization rates and biofilter performance for beads acclimated at different temperatures regimes separated and mixed were also determined. Total ammonia utilization …

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Assessing The Silicon Status Of Rice (Oryza Sativa), Joseph Eugene Kraska Jan 2009

Assessing The Silicon Status Of Rice (Oryza Sativa), Joseph Eugene Kraska

LSU Master's Theses

Low silicon (Si) content in rice, sugarcane and other Si-accumulating crops can adversely affect crop performance due to reduced tolerance to both abiotic and biotic stresses. This research had two specific objectives relative to Si in Louisiana rice: develop a digestion procedure for Si tissue analysis that is robust, accurate, precise, and requires equipment commonly found in most agricultural laboratories; and survey the Si status of rice plants at mid-tiller (Y-leaf) and after harvest (straw) throughout the rice-growing regions of Louisiana. Assessing the Si status of a crop typically depends upon accurately measuring Si accumulation in plant tissue. While wet-digestion …

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Carotid Intima-Media Thickness And Physical And Cognitive Function In Elderly Men And Women: Role Of Physical Activity, John Brent Jr. Rhodes Jan 2009

Carotid Intima-Media Thickness And Physical And Cognitive Function In Elderly Men And Women: Role Of Physical Activity, John Brent Jr. Rhodes

LSU Master's Theses

The incidence of cognitive impairment in the aging population remains one of the most common morbidities in the elderly, often associated with a decrease in physical function, institutionalization, and death. Several different mechanisms have been proposed, including age-related changes to the vasculature. The purpose of this study was to examine the relationship between physical activity, carotid intima-media thickness and other vascular measures, and measures of cognitive and physical function in older adults. Measures of daily physical activity, vascular structure and function, and cognitive and physical function were examined in 109 participants [age=81±11 yrs]. Daily physical activity was assessed using the …

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Effect Of Rotational Or Continuous Stocking Method Of Winter Pasture On Beef Heifer Performance, David G. Skeans Jan 2009

Effect Of Rotational Or Continuous Stocking Method Of Winter Pasture On Beef Heifer Performance, David G. Skeans

LSU Master's Theses

Considerable research has been conducted comparing the effect of continuous and some form of rotational stocking method on animal and forage performance, but most research utilizes put-and-take stocking rates. The purpose of this research was to determine the effect of 12-paddock rotational stocking method (ROT) or continuous stocking method (CONT) of winter wheat (Triticum aestivum) and annual ryegrass (Lolium multiflorum) pastures on beef heifer and forage performance while maintaining a continuous stocking rate of 3.7 heifers/ha. Two experiments were conducted and analyzed separately due to confounding year and location. Heifer ADG and WG/ha tended to be increased by ROT compared …

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Comparisons Of Physicochemical Properties Of Watermelon Juice Treated With Pulsed Electric Fields And Thermal Pasteurization, Lauren Nicole Cook Jan 2009

Comparisons Of Physicochemical Properties Of Watermelon Juice Treated With Pulsed Electric Fields And Thermal Pasteurization, Lauren Nicole Cook

LSU Master's Theses

Pulsed electric field (PEF) treatment is a non-thermal and alternative pasteurization treatment for fruit juices. PEF applies short pulses of electricity to a liquid food sample which inactivates microorganisms and enzymes. Thermal pasteurization is commonly used to pasteurize juice in the fruit juice industry but the process tends to deteriorate color, nutrients, and overall juice appearance. The overall goal of this study was to determine the effects of PEF treatment (30 kv/cm for 57 ìs in bipolar 2 ìs pulses at 22°C) on color, lycopene content, vitamin C content, pH, °Brix, and microbial count when compared with the effects of …

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Using Demographic Models To Manage Chinese Privet (Ligustrum Sinense Lour.), Metha Martine Klock Jan 2009

Using Demographic Models To Manage Chinese Privet (Ligustrum Sinense Lour.), Metha Martine Klock

LSU Master's Theses

Colonization of natural areas by Chinese privet (Ligustrum sinense Lour.) threatens biodiversity and preservation of native habitat in the southeastern United States. High rates of seed production and dispersal, coupled with clonal growth, result in a competitive advantage when introduced to novel areas. Land managers have attempted to control L. sinense through prolonged flooding, prescribed fire, and herbicide application with little success. I determined presence of L. sinense invasion in four sites in Louisiana and assessed key reproductive, growth, and survivorship characteristics defining its life course. I used vegetation surveys, germination trials, dendrochronology, and demographic models to elucidate stages in …

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