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2001

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Neither Natchez Nor Tara: An Environmental Historial Geography Of The Upper Pearl River Basin Of Mississippi, Protohistoric Period To 1940., Frederick William Sunderman Jan 2001

Neither Natchez Nor Tara: An Environmental Historial Geography Of The Upper Pearl River Basin Of Mississippi, Protohistoric Period To 1940., Frederick William Sunderman

LSU Historical Dissertations and Theses

This study examines the contrasting themes of land degradation and environmental stewardship of farming enterprises in the regional context of the Upper Pearl River Basin of Mississippi. Both the previous imagery and analysis of Southern Cotton Belt agriculture emphasize the profligate nature of farming practices. The contribution this study makes is to amend both the stock images and macro-analyses of Southern cotton culture. Analysis at the sub-regional level demonstrates that many farmers actually practiced sound land management techniques. Reconstructing the experiences of farmers in the Upper Pearl River Basin provides examples of ways in which regional distinctions amend widely conceived …

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Resorcinol Condensation Products: A New Class Of Colorimetric Sensors For Saccharides., Claude Joseph Davis Jan 2001

Resorcinol Condensation Products: A New Class Of Colorimetric Sensors For Saccharides., Claude Joseph Davis

LSU Historical Dissertations and Theses

Resorcinarenes are a unique class of cyclic aromatic tetramers that have been known for over a century. In our laboratories, we have reported the first synthesis, isolation, and characterization of resorcinarenes with arylboronic acid functionality their framework. The physical property studies of our new resorcinarene series resulted in covalent and non-covalent binding studies, which revealed the first evidence chair (c2h) resorcinarenes can compete effectively with their crown (c4v ) counterparts the binding of polar guests (i.e. carbohydrates). In addition, the chiral tetraarylboronate octols have demonstrated potential utility as substrates for stereoselective extractions carbohydrates. A facile method for detecting and monitoring …

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Factors Affecting Community Structure Of Mangroves Associated With Point Bars And Islands In A Costa Rican Estuary., Patricia Delgado-Sanchez Jan 2001

Factors Affecting Community Structure Of Mangroves Associated With Point Bars And Islands In A Costa Rican Estuary., Patricia Delgado-Sanchez

LSU Historical Dissertations and Theses

A conceptual model of relationships between mangrove community structure and their physico-chemical environment is developed for point bars and islands in the Tempisque-Bebedero estuarine system, Pacific coast, Costa Rica. The model identifies key variables whose relationships to mangrove forest structure are the focus of extended field and mesocosm studies. Point bars and islands are very dynamic features constantly modified by hydrology and sediment dynamics. In the Tempisque-Bebedero system, they are additionally modified by extensive agricultural activities. High riverine sediment loads, associated with irrigation and seasonal wind-driven resuspension, result in significantly higher sediment deposition in lower intertidal zones; upper intertidal zones …

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Synthetic Peptides: Design, Structure And Biological Function., Lars Gustav Johan Hammarstrom Jan 2001

Synthetic Peptides: Design, Structure And Biological Function., Lars Gustav Johan Hammarstrom

LSU Historical Dissertations and Theses

The synthesis of a series of polyfunctional Calpha,C alpha-disubstituted glycines is described. The lysine-like amino acid analog, Api, was prepared by regioselective hydrolysis of a triBoced hydantoin, followed by Nalpha-protection to yield the first orthogonally protected ionizable Calpha,Calpha-disubstituted amino acid which is alicyclic. The synthesis of three orthogonally protected tetrafunctional amino acids, Bap, Bglu, and Basp was envisioned by alkylation of the organic synthon ethyl nitroacetate. Subsequent regioselective modification should allow for the isolation of the first tetrafunctional amino acid derivatives suitable for solid-phase synthesis. These amino acids are designed to induce peptide secondary structure by salt-bridge stabilization. A series …

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Synthesis, Isolation, And Characterization Of Novel Organic Electronic Architectures., Taiya Sprull Fabre Jan 2001

Synthesis, Isolation, And Characterization Of Novel Organic Electronic Architectures., Taiya Sprull Fabre

LSU Historical Dissertations and Theses

Interest in the fullerenes is due, in large part, to the fact that they represent the third major form of carbon, following graphite and diamond. We have investigated synthetic methods towards the creation of new carbon molecules derived from the fullerenes. The sought-after dimeric carbon fullerene derivative, C122, was successfully synthesized and isolated for the first time in modest yield from a complex reaction mixture. The all-carbon molecular allotrope was prepared via the new reaction of C60 with atomic carbon in solution. Atomic carbon was produced via the known thermolytic decomposition of diazotetrazole. Future work that could emanate from these …

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Glyphosate- And Glufosinate -Resistant Technologies: Weed Management And Off-Target Crop Response., Jeffrey Mark Ellis Jan 2001

Glyphosate- And Glufosinate -Resistant Technologies: Weed Management And Off-Target Crop Response., Jeffrey Mark Ellis

LSU Historical Dissertations and Theses

Utility of preemergence soil-applied herbicides at full and half label rates were evaluated in glyphosate-resistant soybean. In most instances, differences in early season weed density and height were not noted when rates were reduced. None of the herbicides provided complete weed control, but some delayed weed growth providing an extra 3 to 7 days before the first postemergence glyphosate application was needed. Based on weed control and soybean yield, use of glyphosate alone was as effective as when preemergence herbicides were followed by glyphosate. In another study, barnyardgrass control with glyphosate at 0.84 and 1.12 kg ai/ha was not antagonized …

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Superfast Dynamics Of Bipyridinium Ions At Interfaces And Polar Solutions., Yixiang Huang Jan 2001

Superfast Dynamics Of Bipyridinium Ions At Interfaces And Polar Solutions., Yixiang Huang

LSU Historical Dissertations and Theses

The super-fast dynamics of solutes in polar solvents and at solid-liquid interface is investigated by femtosecond time-resolved Raman scattering (RRS) and computer simulation of molecular dynamics (MD). Femtosecond RRS is used to investigate four bipyridinium radicals in aqueous solution: methylviologen monocation MV+, benzylviologen monocation, 4,4'-bipyridinium-N,N'-di(propylsulfonate) monoanion and N,N'-ethylene-2,2' -bipyridinium monocation. Time-resolution of the dynamics of the four radicals is carried out by a pump and probe technique using the time-dependent transient intensity of Stokes and anti-Stokes RRS of C-C stretching mode. It is found that the lifetime of the electronic excited state B3u is less than 350 fs and the …

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X -Ray Absorption Fine Structure (Exafs And Xanes) And Microscopic Investigations Of Supramolecular Systems., Pierre Nicolas Floriano Jan 2001

X -Ray Absorption Fine Structure (Exafs And Xanes) And Microscopic Investigations Of Supramolecular Systems., Pierre Nicolas Floriano

LSU Historical Dissertations and Theses

Self-assembled monolayers of n-alkanethiols, CH3-(CH 2)x-SH, on Au, Ag, and Cu have been studied with Grazing incidence EXAFS (GIXAFS) at the sulfur K-edge. Characterization of the bonding of self-assembled monolayers is of great interest because of their ability to tailor physical and chemical properties of surfaces. For both pentanethiol and decanethiol monolayers on Ag and Cu, the three-fold hollow site is found to be the most probable sulfur binding site. However, observations for octadecanethiol indicate that the three-fold-hollow site is not the exclusive binding site. In addition, the possible existence of disulfide bonds on the metal surface (adsorbed dialkyldisulfides) is …

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The Influence Of Agricultural Policy On Economic Integration Among Central American Countries: A Game Theoretic Analysis., Jorge Luis Icabalceta Mairena Jan 2001

The Influence Of Agricultural Policy On Economic Integration Among Central American Countries: A Game Theoretic Analysis., Jorge Luis Icabalceta Mairena

LSU Historical Dissertations and Theses

The influence of eight commodity groups on international economic integration in five Central American countries are analyzed. The commodity groups are rice, beans, corn, sorghum, bananas, coffee, sugar, and beef. The countries are Costa Rica, El Salvador, Guatemala, Honduras, and Nicaragua. A game theory framework is used to find a Nash equilibrium solution to a set of trade negotiation scenarios. The payoffs of the Political Preference Function (PPF) are used for the trade liberalization scenarios under analysis. These PPF payoffs are estimated using the MISS model. The nominal protection coefficient (NPC) is used as the main criterion for trade liberalization. …

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Analysis Of Hydrocarbon Materials By Use Of Nonpolar Matrices In Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry (Maldi-Ms)., Stephen Francis Macha Jan 2001

Analysis Of Hydrocarbon Materials By Use Of Nonpolar Matrices In Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry (Maldi-Ms)., Stephen Francis Macha

LSU Historical Dissertations and Theses

In this study, polyaromatic hydrocarbon compounds including anthracene, pyrene, acenaphthene and perylene were investigated as nonpolar matrices in matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) for the analysis of selected nonpolar analytes. First, the influence of matrix and the analyte ionization potentials on a charge-transfer ionization mechanism were determined. Results of these studies demonstrated that formation of radical molecular cations in MALDI-MS depends on the ionization energy difference between the matrix and the analyte. Charge-transfer ionization occurs only when the ionization potential of the matrix is higher than that of the analyte. Next, nonpolar matrices were investigated for the analysis of …

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Synthesis Of Phosphonopeptides And Alpha, Alpha-Dialkylated Amino Acid-Rich Peptides., Sheila Denise Rushing Jan 2001

Synthesis Of Phosphonopeptides And Alpha, Alpha-Dialkylated Amino Acid-Rich Peptides., Sheila Denise Rushing

LSU Historical Dissertations and Theses

Peptides and peptide analogs are central to the understanding of biological and biochemical phenomena as well as in the development of new pharmaceutical agents. This research encompasses two classes of peptide mimetics: phosphonopeptides and short, amphipathic peptides rich in alpha,alpha-disubstituted amino acids (alphaalphaAA). The focus of the first part of the peptide analog project was on the preparation of sterically-hindered phosphonamide and thiophosphonamide dipeptides. Conditions were developed, based on our P(III) synthetic approach, for the preparation of the phosphonamide dipeptides, Cbz-CyhGly psi [P (O) (OpNb) NH] Trp-NH2 and Cbz-CyhGly psi [P (O) (OpNb) NH] Trp-OMe, which were previously unattainable by …

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Benthic Foraminifera In Two Stressed Environments Of The Northern Gulf Of Mexico., Emil Platon Jan 2001

Benthic Foraminifera In Two Stressed Environments Of The Northern Gulf Of Mexico., Emil Platon

LSU Historical Dissertations and Theses

This is a study of Foraminifera from two stressed environments of the northern Gulf of Mexico: one of coastal seasonal hypoxia, the other of hydrocarbon seeps in bathyal depths---oxygen depletion being the common stressor. Many species of benthic Foraminifera survive the extreme oxygen depletion of Louisiana shelf waters in spring and summer. The dominant species are infaunal and have an adaptive tolerance to near anoxia or anoxia. A census of foraminiferal species present in dated sediment core samples reveals significant changes in the composition of the Louisiana-shelf benthic foraminiferal community in the past century. Agglutinated and porcelaneous orders living in …

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Middle School Students' Understanding Of The Natural History Of The Earth And Life On Earth As A Function Of Deep Time., Azalie Cecile Pulling Jan 2001

Middle School Students' Understanding Of The Natural History Of The Earth And Life On Earth As A Function Of Deep Time., Azalie Cecile Pulling

LSU Historical Dissertations and Theses

The purpose of this study was to use deep time, that is geologic time as a mechanism to explore middle school students' understanding of the natural history of the earth and the evolution of life on earth. Geologic time is a logical precursor to middle school students' understanding of biological evolution. This exploratory, mixed model study used qualitative and quantitative methods in each stage of the research to explore sixth grade students, understanding of geologic time, their worldviews (e.g., conceptual ecology), and conceptual change. The study included fifty-nine students in the large group study and four case studies. The primary …

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Red Morningglory (Ipomoea Coccinea L.) And Sugarcane Response To Soil-Applied Herbicides., Blaine Joseph Viator Jan 2001

Red Morningglory (Ipomoea Coccinea L.) And Sugarcane Response To Soil-Applied Herbicides., Blaine Joseph Viator

LSU Historical Dissertations and Theses

Laboratory and greenhouse studies were conducted to determine if reported red morningglory (Ipomoea coccinea L.) control failures with atrazine in sugarcane are due to triazine-resistant mutants. Terminal fluorescence of leaf material from locations with and without a history of atrazine use increased after treatment with atrazine, indicating electron transport inhibition and hence, triazine susceptibility. Postemergence (POST) application of atrazine controlled plants from all populations at least 99%, supporting findings of the fluorescence assay. A field study was conducted to evaluate red morningglory control and sugarcane injury with herbicides applied at layby. At 45 days after treatment (DAT), control with sulfentrazone …

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Systemic And Colonic Hemodynamic And Vasomotor Responses To Adenosine Triphosphate In Horses., Joanne Tetens Jan 2001

Systemic And Colonic Hemodynamic And Vasomotor Responses To Adenosine Triphosphate In Horses., Joanne Tetens

LSU Historical Dissertations and Theses

Clinically healthy horses were instrumented to measure hemodynamic, metabolic, hematologic, and serum biochemical variables and monitor clinical signs during and after IV infusion of ATP-MgCl2. Conscious horses were administered ATP-MgCl2 (0.05 mg ATP/kg body weight/min; 0.05 mg/kg/min increments; maximum rate-1.0 mg/kg/min), which caused a rate-dependent increase in cardiac output, decrease in systemic vascular resistance, and mild pulmonary hypertension. The maximal safe infusion rate was 0.3 mg ATP/kg body weight/min. Anesthetized horses administered ATP-MgCl2 (0.1 to 1 mg/kg/min; 0.1 mg/kg/min increments) developed a rate-dependent decrease in systemic and colonic vascular resistance via vasodilatation. In conscious horses administered lowdose endotoxin, ATP-MgCl2 (dose-100 …

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Effects Of Energy Source And Soil Reaction On Redox, Soil Color, And Sesquioxide Transformation For The Moreland And Sharkey Soils., Jang-Hung Huang Jan 2001

Effects Of Energy Source And Soil Reaction On Redox, Soil Color, And Sesquioxide Transformation For The Moreland And Sharkey Soils., Jang-Hung Huang

LSU Historical Dissertations and Theses

Moreland clay (very fine, smectitic, thermic, Oxyaquic Hapluderts) derived from Red River alluvium does not exhibit redoximorphic features, though it is saturated for more than 2 months during the growing season. Sharkey clay (very-fine, smectitic, thermic Chromic Epiaquerts) derived from the Mississippi River alluvium exhibits redoximorphic features. The objectives of this study were to determine the effects of energy sources and adjusted pH on Eh, pH, and iron transformation on these two Vertisols in Louisiana. Laboratory analysis was used to evaluate the factors controlling the formation of redoximorphic features. The first experiment was designed to predict the effects of 10 …

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Remediation Of An Oil Contaminated Wetland And The Effects Of Crude Oil And Brine On Two-Year Old Loblolly Pine (Pinus Taeda) Seedlings., Dean Anthony Goodin Jan 2001

Remediation Of An Oil Contaminated Wetland And The Effects Of Crude Oil And Brine On Two-Year Old Loblolly Pine (Pinus Taeda) Seedlings., Dean Anthony Goodin

LSU Historical Dissertations and Theses

The goal of this project is to introduce a successful remediation and restoration plan for a wetland and pine forest contaminated by an oil well blowout. A field study focused on the effectiveness of ammoniated bagasse (ABG) to enhance the bioremediation of the contaminated wetland. A comprehensive soil and vegetation greenhouse study investigated the effects of oil and brine on loblolly pine tree seedlings and the effectiveness of ABG to remove and remediate oil contaminated forest soils. The most effective, ecologically sound, and economical plan to remove the oil from the wetland was to burn the area. Once the area …

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A Study Of The Measurement And Sources Of Teachers' Self And Collective Efficacy Beliefs In Professional Learning Environments., Amy Marie Barrilleaux Dellinger Jan 2001

A Study Of The Measurement And Sources Of Teachers' Self And Collective Efficacy Beliefs In Professional Learning Environments., Amy Marie Barrilleaux Dellinger

LSU Historical Dissertations and Theses

This study examined relationships between sources of efficacy information available in teachers' professional learning environments and teacher self-, work-group collective and faculty collective efficacy beliefs. An argument is presented that teachers' individual and collective efficacy beliefs are vital factors that mediate linkages between professional learning and meaningful change in schools. School professional learning environments are hypothesized to provide efficacy information that may serve to enhance teachers' beliefs in their abilities to accomplish tasks that are linked to effective teaching and learning. Social cognitive theory and triadic reciprocal causation provided the framework for this research. Self-efficacy theory, a sub-theory of social …

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Pyrrole -Terminated Dendrimers For Use In Polymerizable Monolayers And Guest Encapsulation Systems., Charles Oakley Noble Iv Jan 2001

Pyrrole -Terminated Dendrimers For Use In Polymerizable Monolayers And Guest Encapsulation Systems., Charles Oakley Noble Iv

LSU Historical Dissertations and Theses

This work demonstrates the use of pyrrole-terminated dendrimers (PTD)s for the oxidation-state-dependant encapsulation and release of various guest molecules. In order to achieve the goals of this research, a two-step approach was taken. The first portion of this doctoral work involved synthesis of low-generation (small number of peripheral groups) PTDs having a simple structure (DAB-Py x, X = 4, 8, 16) and studying the intramolecular oligomerization of the terminal pyrrole groups by well-known electrochemical methods. After the proof-of-concept study with low-generation PTDs, the next step involving more complex, high-generation PTDs (DAB(COCyPy)x, Y = 3 or 5, X = 32 or …

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The Effect Of Calcium Silicate On Rice Yield And Sheath Blight Disease., Chris Raymond Robichaux Jan 2001

The Effect Of Calcium Silicate On Rice Yield And Sheath Blight Disease., Chris Raymond Robichaux

LSU Historical Dissertations and Theses

Sheath blight caused by fungal pathogen Rhizoctonia solani can cause significant yield loss in rice, especially in warm, high rainfall environments. Integrated pest management (IPM) is the key to sheath blight control. This system utilizes disease resistance, pesticides, cultural practices and biological control to control multiple pests. Silicon fertilization is an additional cultural practice that can reduce sheath blight severity and increase grain yield. Studies were conducted in the greenhouse and field to determine the effect of calcium silicate on sheath blight severity, rice grain yield, and leaf silicon concentration. Results in the greenhouse study showed that sheath blight severity …

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A Neural Network Approach To Dependent *Reliability Estimation., Roya Javadpour Jan 2001

A Neural Network Approach To Dependent *Reliability Estimation., Roya Javadpour

LSU Historical Dissertations and Theses

This research presents the creation of a new model for automating the generation of component and system reliability estimates from simulated field data for tightly coupled systems. The model utilizes the CMAC neural network architecture, which resembles the human cerebellum and is capable of approximating nonlinear functions. An analysis and testing of the network as a tool for reliability prediction of dependent components within an assembly has been performed. In order to evaluate the performance of the model, the network has been tested on simulated data and provided over 90% performance accuracy in learning non-linear functions that represent the dependency …

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Ecological Structure Of Estaurine Fish Communities: Habitat Linkages Among Dominant Species Groups In Terminos Lagoon, Mexico., Ana Laura Lara-Dominguez Jan 2001

Ecological Structure Of Estaurine Fish Communities: Habitat Linkages Among Dominant Species Groups In Terminos Lagoon, Mexico., Ana Laura Lara-Dominguez

LSU Historical Dissertations and Theses

Terminos Lagoon in the southern Gulf of Mexico has 5 ecological subsystems: (1) fluvial lagoon systems (FLS) with permanent river discharge, low salinity, high turbidity and nutrients. (2) Central basin (CB) between marine and river conditions, intermediate salinity and variable transparency. (3) Inner littoral of Carmen Island (ILCI) with strong marine influence, high transparency and extensive seagrass meadows. (4) Carmen inlet (Estero Pargo, ESP) with a net outflow of water and high turbidity. (5) Puerto Real inlet (PR) with a net inflow of waters, high transparency and seagrasses. During a 15-month sampling, 13,691 individuals of 79 different species were collected …

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Natural History And Phytogeography Of The Loess Hills And Ravines, Lower Mississippi Embayment., Igor Igorevich Ignatov Jan 2001

Natural History And Phytogeography Of The Loess Hills And Ravines, Lower Mississippi Embayment., Igor Igorevich Ignatov

LSU Historical Dissertations and Theses

Although located near the middle of the Southeastern Coastal Plain, the hardwood forests of the Loess Hills of the Lower Mississippi Embayment have never been thoroughly studied or satisfactorily described in the literature. This dissertation is a case study of the biogeographic variation in the species composition and structure of the mature ravine hardwood forests within the southern section of the Loess Hills, from Warren County, Mississippi, south to East Baton Rouge and Vermilion Parishes, Louisiana, as affected by latitude, physiography, edaphic conditions, and disturbance. A parallel goal is, on the basis of the current biogeographic conditions and successional dynamics, …

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Metal Partitioning Among Tissues And Exoskeleton Of Palaemonetes Pugio And Its Role In Depuration And Trophic Transfer., Kristen Annette Keteles Jan 2001

Metal Partitioning Among Tissues And Exoskeleton Of Palaemonetes Pugio And Its Role In Depuration And Trophic Transfer., Kristen Annette Keteles

LSU Historical Dissertations and Theses

The objective of this dissertation was to determine the partitioning of Cu, Zn and Cd between tissues and exoskeleton of the grass shrimp, Palaemonetes pugio Holthius, and to examine the consequences of this association. The role of the exoskeleton in the potential for depuration of metals through ecdysis was examined first. The portion eliminated with the exuviae varied for each metal; 11% Cu, 18% Zn, and 26% Cd of the total intermolt body burden was associated with exuviae. Some fraction of Cu and Cd in the exoskeleton was likely reabsorbed before molting but excess Zn was likely depurated through excretion. …

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Performativity And Performance: Representing The Tattooed Body., Mindy Elaine Fenske Jan 2001

Performativity And Performance: Representing The Tattooed Body., Mindy Elaine Fenske

LSU Historical Dissertations and Theses

In this study I examine visual representations of tattooed bodies in three arenas of cultural production: tattoo conventions, advertising, and neo-tribal books. Through the methodological lens of genealogies of performance, I analyze these texts' construction of the tattooed body as classed, gendered, and exotic. I argue that contemporary representations of the tattooed body resist and reproduce discursive power regimes by surrogating prior cultural performances and representations of performance. I argue that contemporary visual representations of the tattooed body succeed in resisting discursive authority when they performatively cite multiple and transgressive authorities. I additionally indicate that the body in representation transgresses …

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Development And Characterization Of Velocity Workspaces For The Human Knee., John Eric Fuller Jan 2001

Development And Characterization Of Velocity Workspaces For The Human Knee., John Eric Fuller

LSU Historical Dissertations and Theses

The knee joint is the most complex joint in the human body. A complete understanding of the physical behavior of the joint is essential for the prevention of injury and efficient treatment of infirmities of the knee. A kinematic model of the human knee including bone surfaces and four major ligaments was studied using techniques pioneered in robotic workspace analysis. The objective of this work was to develop and test methods for determining displacement and velocity workspaces for the model and investigate these workspaces. Data were collected from several sources using magnetic resonance imaging (MRI) and computed tomography (CT). Geometric …

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Spatial Variability And Isotopic Studies Of The Prairie -Forest Transition Soil In Louisiana., Asfaw Bekele Jan 2001

Spatial Variability And Isotopic Studies Of The Prairie -Forest Transition Soil In Louisiana., Asfaw Bekele

LSU Historical Dissertations and Theses

The calcareous prairies of Louisiana are among the most endangered ecosystems in North America. The major threat to this ecosystem is the invasion by woody and herbaceous plants, primarily eastern red cedar (Juniperus virginiana ). The restoration and management of these rare plant communities require a thorough understanding of the soils supporting them. Geostatistical, fractal, and stable isotopic procedures were integrated to study the soil and vegetation spatial variability. The prairie soil was alkaline, the forest soil was acidic, and the transition soil was neutral. The spherical model described the spatial variability of virtually all the soil properties considered with …

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Physiology And Lateralization Of Swallowing: A Comparison Between Young And Old Adults., Stephanie Kay Daniels Jan 2001

Physiology And Lateralization Of Swallowing: A Comparison Between Young And Old Adults., Stephanie Kay Daniels

LSU Historical Dissertations and Theses

Age-related changes in discrete swallows have been well researched, but few studies have investigated sequential swallowing with little emphasis on age-related changes. It is also unclear whether the cortical representation of swallowing is lateralized to one hemisphere or is bilaterally represented. As such, the aims of this research were to examine deglutitive biomechanics of sequential straw swallowing (Experiment I), and study swallowing lateralization using a dual task paradigm in healthy, young and old adults (Experiment II). Thirty-eight right-handed men (young = 20, old = 18) were studied. Experiment I: Videofluoroscopic swallow samples of two 10-second straw drinking trials were obtained. …

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The Across-Shelf Distribution Of Larval, Postlarval And Juvenile Fishes Collected At Oil And Gas Platforms And A Coastal Jetty Off Louisiana West Of The Mississippi River Delta., Frank Joseph Hernandez Jr Jan 2001

The Across-Shelf Distribution Of Larval, Postlarval And Juvenile Fishes Collected At Oil And Gas Platforms And A Coastal Jetty Off Louisiana West Of The Mississippi River Delta., Frank Joseph Hernandez Jr

LSU Historical Dissertations and Theses

A cross-shelf transect of three petroleum platforms and a coastal rock jetty (another hard-substrate, artificial habitat) in the northcentral Gulf were sampled to examine the role that oil and gas platforms (hard substrate habitat) may play in the early life history stages of reef-dependent and reef-associated fishes. The ichthyoplankton and juvenile fish assemblages were sampled at Green Canyon 18 (GC 18; 230 m depth, shelf slope); Grand Isle 94 (GI 94; 60 m depth, mid-shelf); and South Timbalier 54 (ST 54; 20 m depth, inner shelf) with passive plankton nets and light-traps and at a coastal rock jetty (Belle Pass; …

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T -Cell Cytokines And Equine Nematode Infections., Jenifer Dee Edmonds Jan 2001

T -Cell Cytokines And Equine Nematode Infections., Jenifer Dee Edmonds

LSU Historical Dissertations and Theses

To address the role of parasites on subsequent antigenic challenge, humoral, lymphoproliferative and cytokine responses to a single intramuscular injection of keyhole limpet haemocyanin (KLH) were compared between groups of ponies with high, medium or low gastrointestinal parasite burdens. Heavy and moderately parasitised animals showed a trend towards reduced KLH-specific lymphoproliferation and reduced antigen specific total immunoglobulin, IgG(T) and IgA compared to lightly parasitised ponies. The peripheral blood mononuclear cells (PBMC) from medium and heavily parasitised ponies also had significantly lower levels of IL-4. These data indicate that heavily parasitised animals have uniformly decreased cellular and humoral immune responses to …

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