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Fa Composition Of Crude Oil Recovered From Catfish Viscera, Subramaniam Sathivel, Witoon Prinyawiwatkul, Casey C. Grimm, Joan M. King, Steven Lloyd Jan 2002

Fa Composition Of Crude Oil Recovered From Catfish Viscera, Subramaniam Sathivel, Witoon Prinyawiwatkul, Casey C. Grimm, Joan M. King, Steven Lloyd

Faculty Publications

The FA composition of crude catfish oil recovered from whole viscera, digestive tract, liver, gallbladder, and visceral storage fat was determined and compared with that of fillet and nugget (abdominal portion). About 34% crude fat (wet basis) could be recovered from the whole catfish viscera. FA found in crude catfish visceral oil were C14:0, C16:0, C16:1, C18:0, C18:1, C18:2, C18:3, C20:0, C20:1, C20:2, C20:3, C20:4, and C22:6, the predominant FA being C18:1, C16:0, C18:2, and C18:0. Catfish visceral oil was characterized by a high level of unsaturated FA, which was similarly found in fillet and nugget. Total unsaturated FA in …

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Subversive Aspects Of American Musical Theatre, Donald Elgan Whittaker Iii Jan 2002

Subversive Aspects Of American Musical Theatre, Donald Elgan Whittaker Iii

LSU Doctoral Dissertations

Critical discourse regarding musical theatre takes, for the most part, the form of a profound silence, due presumably to a dismissal of the genre as simplistic and insubstantial. Not only have the elements of musical theatre been present in the majority of theatrical history, but many of the greatest theories regarding theatre have included these elements, including Brecht and Wagner. Musicals have also often concerned themselves with the Other, centering and sympathizing him/her in a manner unavailable to non-musical works. The Others that have thus been positioned are often delineated from hegemonic groups which are concretely those in power, but …

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Capillary And Microdevice Electrophoretic Tools For Genetic Analyses: Heteroduplex Analysis For Tuberculosis Drug Susceptibility And Ligase Detection Reaction For Colorectal Cancer Detection, Gloria Thomas Jan 2002

Capillary And Microdevice Electrophoretic Tools For Genetic Analyses: Heteroduplex Analysis For Tuberculosis Drug Susceptibility And Ligase Detection Reaction For Colorectal Cancer Detection, Gloria Thomas

LSU Doctoral Dissertations

The traditional format of electrophoresis, the slab gel, is quickly being replaced by capillary and microdevice platforms, which offer improvements in cost, resolution, speed, quantitation and automation in genetic analyses. These techniques also employ a variety of separation matrices while the slab gel is limited to agarose and polyacrylamide. The research presented here explores the use of these electrophoretic formats for the detection of single nucleotide mutations using two genetic models associated with human disease. Slab gel based heteroduplex analysis (HDA), a popular mutation scanning method, uses a specially designed universal heteroduplex generator (UHG) containing controlled variation to enhance the …

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The Combined Effects Of Salinity And Sulfide On The Growth And Physiology Of The Freshwater Marsh Plant Pancium Hemitomon J.A. Schultes, James Wesley Pahl Jan 2002

The Combined Effects Of Salinity And Sulfide On The Growth And Physiology Of The Freshwater Marsh Plant Pancium Hemitomon J.A. Schultes, James Wesley Pahl

LSU Doctoral Dissertations

Vegetative response to saltwater intrusion into coastal freshwater wetlands is governed by the combined effects of increased salinity and porewater sulfide concentrations. I conducted a series of experiments to address the primary hypothesis that growth of Panicum hemitomon is adversely affected by an interaction between salinity and sulfide stresses associated with saltwater intrusion, and the mechanisms for decreased growth are alterations in the metabolic and morphological adaptations needed for a plant to survive in a flooded environment. I exposed marsh sods to a factorial treatment arrangement of three salinities (0, 2, and 4 ppt) and three porewater sulfide concentrations (0, …

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The Matson And Mayville (M&M) Seizure Scale: An Assessment Of Psychological And Environmental Variables Contributing To Seizure Activity In Persons With Mental Retardation, Erik Andrew Mayville Jan 2002

The Matson And Mayville (M&M) Seizure Scale: An Assessment Of Psychological And Environmental Variables Contributing To Seizure Activity In Persons With Mental Retardation, Erik Andrew Mayville

LSU Doctoral Dissertations

Seizure activity can be debilitating across a number of physical, social, occupational, and personal domains. Given the deficits in all of these areas frequently present in persons with mental retardation, the control and elimination of seizures is a primary goal for individuals with both mental retardation and epilepsy. Antiepileptic medication can reduce seizure activity. However, this intervention often carries with it a range of untoward side effects that may adversely affect clients over what is typically a long-term treatment regimen. Over the last 20 years, literature has emerged emphasizing the importance of environmental variables in the initiation and maintenance of …

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Body And Soul: Food, The Female (In) Corporeal, And The Narrative Effects Of Mind/Body Duality, Andrea Adolph Jan 2002

Body And Soul: Food, The Female (In) Corporeal, And The Narrative Effects Of Mind/Body Duality, Andrea Adolph

LSU Doctoral Dissertations

This study combines philosophical, historical, and cultural modes of inquiry in order to explore what has occurred when selected authors have attempted to "write the body." Augmented by archival and primary cultural research, the dissertation is grounded in the experiential, "everyday" qualities of women's lives. Samples of women's cultural materials such as beauty, cookery, and household management texts, and popular women's magazines serve as informative backdrops for an investigation of middle- and working-class British and Anglo-Irish women's culture during the twentieth century. This study investigates some of the ways in which women have thought about food in relation to more …

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Synthesis, Characterization, And Applications Of Novel Pseudostationary Phases In Micellar Capillary Electrophoresis For Separation Of Chiral And Archiral Compounds H[Electronic Resource], Cevdet Akbay Jan 2002

Synthesis, Characterization, And Applications Of Novel Pseudostationary Phases In Micellar Capillary Electrophoresis For Separation Of Chiral And Archiral Compounds H[Electronic Resource], Cevdet Akbay

LSU Doctoral Dissertations

The research presented in this dissertation involves the synthesis, characterization, and the use of novel surfactants, including both micelles and vesicles, as pseudostationary phases in micellar capillary electrophoresis (MCE) for the separation of achiral and chiral compounds. Separation of environmental pollutants such as 2 to 6-ring polycyclic aromatic hydrocarbons (PAHs) was achieved using poly(sodium undecylenic sulfate). A baseline separation of all 16 PAHs was possible for the first time in MCE by a single-surfactant system. In addition, a surfactant with a phosphated head group, i.e., di(2-ethylhexyl)phosphate (DEHP), was also introduced as a novel pseudostationary phase for separation of 21 weakly …

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Experience-Based Language Acquisition: A Computational Model Of Human Language Acquisition, Brian Edward Pangburn Jan 2002

Experience-Based Language Acquisition: A Computational Model Of Human Language Acquisition, Brian Edward Pangburn

LSU Doctoral Dissertations

Almost from the very beginning of the digital age, people have sought better ways to communicate with computers. This research investigates how computers might be enabled to understand natural language in a more humanlike way. Based, in part, on cognitive development in infants, we introduce an open computational framework for visual perception and grounded language acquisition called Experience-Based Language Acquisition (EBLA). EBLA can “watch” a series of short videos and acquire a simple language of nouns and verbs corresponding to the objects and object-object relations in those videos. Upon acquiring this protolanguage, EBLA can perform basic scene analysis to generate …

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Screening And Characterization Of Pathogenic Fungi For Possible Control Of Coptotermes Formosanus, Jianzhong Sun Jan 2002

Screening And Characterization Of Pathogenic Fungi For Possible Control Of Coptotermes Formosanus, Jianzhong Sun

LSU Doctoral Dissertations

Coptotermes formosanus was used as “bait” to isolate pathogenic fungi from soil. Fifteen pathogenic fungal isolates were obtained, all either Metarhizium anisopliae (six isolates) or Beauveria bassiana (nine isolates). There were no differences in numbers of fungal isolates from the three sampling locations. However, significantly more isolates were found in woodlands (eleven) than in pastures (four). Median lethal doses (LD50s) of these fungal species to C. formosanus were interspersed, indicating that fungal isolates rather than species had the greatest effect on virulence. In vitro growth characteristics were significantly correlated with virulence against termites, suggesting that fungal virulence might be predicted …

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Bacillus Anthracis Spore Concentrations At Various Carcass Sites, Pamala Rose Coker Jan 2002

Bacillus Anthracis Spore Concentrations At Various Carcass Sites, Pamala Rose Coker

LSU Doctoral Dissertations

Bacillus anthracis, the etiological agent of the disease anthrax, is a bacteria of great importance, both in the past and today. Despite this importance, many questions remain regarding defending against its use as a biological weapon, the bacteria's variation in virulence, and its epidemiology in nature. Using Etest strips (AB BIODISK, Solna, Sweden) to measure the MICs, 25 genetically diverse isolates of B. anthracis were tested to determine their susceptibility to seven clinically relevant antimicrobial agents. Using the NCCLS MIC breakpoints for staphylococci, three isolates were found to be resistant to penicillin and negative for beta-lactamase production. From a group …

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The Development And Validation Of The Parent Instruction-Giving Game With Youngsters (Piggy) In A Head Start Population, Stephen Danial Anthony Hupp Jan 2002

The Development And Validation Of The Parent Instruction-Giving Game With Youngsters (Piggy) In A Head Start Population, Stephen Danial Anthony Hupp

LSU Doctoral Dissertations

Head Start families demonstrate many of the risk factors that relate to the development of noncompliance and other behavior problems in young children, such as low income, limited education, teenage pregnancy, isolation, family stress, single parenthood, and parental psychopathology. Noncompliant preschool-aged children often continue to display difficulties through adolescence. Parent Management Training programs have been developed which can improve child compliance. However, many of the same risk factors that lead to child noncompliance also reduce the effectiveness of parenting interventions. Thus, more efficient assessment and intervention strategies need to be developed to facilitate the treatment of child behavior problems in …

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Pleasure Principles: The Social Construction Of Gambling And Sex Addiction Treatment, M. Kelly James Jan 2002

Pleasure Principles: The Social Construction Of Gambling And Sex Addiction Treatment, M. Kelly James

LSU Doctoral Dissertations

The transformation of behavior into deviance requires many players, individuals, and institutions invested in the social construction process and its outcomes. Although considered private recreational matters by some, gambling and having sex are gaining spotlight in the addiction arena. With the growing availability of casino entertainment, lotteries, OTB venues, prostitution, internet pornography, and 900 numbers, gambling and sex are interpreted, labeled, and treated by addiction recovery specialists. Using ethnographic methods and face-to-face interviews, I explore a southern community’s institutions and practitioners providing services to gambling and sex addicts. I examine the community’s discourse and its methods for defining and controlling …

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Sediment Transport In Wind-Exposed Shallow, Vegetated Aquatic Systems, Allen Michael Teeter Jan 2002

Sediment Transport In Wind-Exposed Shallow, Vegetated Aquatic Systems, Allen Michael Teeter

LSU Doctoral Dissertations

Ecosystems with submersed vegetation are relatively shallow, physically stable and of moderate hydrodynamic energy. Submersed vegetation affect hydrodynamic friction for currents and waves resulting in increased overall frictional loss. Seagrasses shelter the sediment bed and reduce wind-wave resuspension. Bed sheltering factors were estimated from previous flume data on Laguna Madre seagrass species. Data from Laguna Madre indicate that total suspended material levels for bare areas are about an order of magnitude higher than some areas with submersed vegetation. Waves in Laguna Madre at depths less than 2 m were found to be smaller than those expected for the same non-dimensional …

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Barium And Lithium In Foraminifera: Glacial-Interglacial Changes In The North Atlantic, Jenney M. Hall Jan 2002

Barium And Lithium In Foraminifera: Glacial-Interglacial Changes In The North Atlantic, Jenney M. Hall

LSU Doctoral Dissertations

The trace element content of calcareous foraminifera provides a powerful tool to the study of glacial-interglacial changes in the physical and chemical properties of the ocean. Foraminifera incorporate barium in direct proportion to its concentration in seawater. Using barium as a nutrient proxy, Ba/Ca in benthic Planulina wuellerstorfi is used to reconstruct changes in thermocline ventilation and mid-depth circulation in the North Atlantic during the last glacial and deglacial time. Rivers are concentrated in barium compared to surface seawater. Therefore, barium in planktonic Neogloboquadrina pachyderma is used to identify deglacial meltwater in the Arctic Ocean. Foraminiferal Li/Ca was analyzed to …

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Narrative Patterns Of Racism And Resistance In The Work Of William Faulkner, Janet Elizabeth Barnwell Jan 2002

Narrative Patterns Of Racism And Resistance In The Work Of William Faulkner, Janet Elizabeth Barnwell

LSU Doctoral Dissertations

Keeping in mind the complicated nature of race relations in the South during the segregation era, as well as the economic volatility of the time, and recognizing Faulkner's position as a white southern writer, this dissertation poses and attempts to answer a few specific questions regarding Faulkner's work. First, beginning with New Orleans Sketches and ending with Go Down, Moses, what texts seem most devoted to examining issues of race difference? Second, where in these texts does Faulkner most strikingly incorporate and then challenge racial stereotypes and cliches about the South? Third, working chronologically, how did Faulkner reconcile his position …

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Outcrop To Subsurface Stratigraphy Of The Pennsylvanian Hermosa Group Southern Paradox Basin U.S.A., Alan Lee Brown Jan 2002

Outcrop To Subsurface Stratigraphy Of The Pennsylvanian Hermosa Group Southern Paradox Basin U.S.A., Alan Lee Brown

LSU Doctoral Dissertations

Pennsylvanian (Desmoinesian) sedimentary rocks within the Paradox Basin Four Corners area of the western United States afford a unique opportunity to study the development of sedimentary successions in a complex marine to nonmarine depositional setting. The close association of thick intervals of nonmarine fan-delta facies adjacent to and in time equivalent position to marine carbonate-evaporite facies suggests complex relationships between the factors affecting deposition. Development of an effective scheme to differentiate the depositional signatures from within these sedimentary successions is the primary goal of this study. To achieve this goal, two objectives were pursued. The first was to calibrate the …

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Bollworm (Lepidoptera: Noctuidae) Ecology On Genetically Engineered Bollgard And Bollgard Ii Cottons, Jeffrey Gore Jan 2002

Bollworm (Lepidoptera: Noctuidae) Ecology On Genetically Engineered Bollgard And Bollgard Ii Cottons, Jeffrey Gore

LSU Doctoral Dissertations

The ecology of bollworms, Helicoverpa zea (Boddie), on Bollgard and Bollgard II cottons, Gossypium hirsutum L., was studied in field and laboratory experiments. Neonate bollworm larvae were placed on selected components of cotton squares and flowers from non-Bollgard, Bollgard, and Bollgard II cotton varieties. Larval survival was higher on flower anthers and square anthers than on other floral parts for each cultivar. Bollworm survival was lowest on all Bollgard II floral structures. To evaluate larval behavior on Bollgard cotton, first instar bollworms were placed on terminals of non-flowering and flowering cotton plants. Larvae were recovered lower on Bollgard cotton than …

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Hypoxanthine Phosphoribosyl Transferase And Early Embryo Development, Michael Gerard Collins Ii Jan 2002

Hypoxanthine Phosphoribosyl Transferase And Early Embryo Development, Michael Gerard Collins Ii

LSU Doctoral Dissertations

The objectives of the first experiment were to ascertain if there were any differences between two mouse areola and adipose tissue cell lines. These cell lines differed only in the presence or absence of the hypoxanthine phosphoribosyl transferase (HPRT) gene. It was found that the cell lines were similar for all parameters. The objectives of the second experiment were to determine if the HPRT gene had an effect on the development of preimplantation mouse embryo. To test this transgenic mouse lines were created. The embryo sex and genotype ratio, the embryo diameter, and the embryo developmental patterns, using a Collin-Ryan …

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Clear-Cutting Eden: Representations Of Nature In Southern Fiction, 1930-1950, Christopher B. Rieger Jan 2002

Clear-Cutting Eden: Representations Of Nature In Southern Fiction, 1930-1950, Christopher B. Rieger

LSU Doctoral Dissertations

This dissertation examines how Southern literary representations of the natural world were influenced by, and influenced, the historical, social, and ecological changes of the 1930s and 1940s. Specifically, I examine the ways that nature is conceived of and portrayed by four authors of this era: Erskine Caldwell, Marjorie Kinnan Rawlings, Zora Neale Hurston, and William Faulkner; through their works, I investigate the intersections of race, class, and gender with the natural environment. I argue that during this time of profound regional and national upheaval there exists a climate of professed binary oppositions and that these authors’ representations of nature in …

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Molecular Systematics Of Barbets And Trogons: Pantropical Biogeography African Speciation, And Issues In Phylogenetic Inference, Robert Glen Moyle Jan 2002

Molecular Systematics Of Barbets And Trogons: Pantropical Biogeography African Speciation, And Issues In Phylogenetic Inference, Robert Glen Moyle

LSU Doctoral Dissertations

Modern phylogenetic methods and molecular data can be powerful tools for examining the evolution of organisms. Of particular interest are historical processes that influenced the diversity and distribution of modern taxa. I examined the evolutionary history of two families of birds, the barbets and toucans (Ramphastidae) and the trogons (Trogonidae). Both groups occur in three disjunct tropical regions, a pattern that offers no simple historical explanation. In addition to their distributions, these two families are also similar in that they are relatively ancient groups but have highly conserved and distinctive morphologies. DNA sequence data do not produce concordant phylogenies for …

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The Perceptions Of And Attitudes Toward Partner Abuse Among First Generation Korean-Americans: Their Relationships To The Incidence Of Partner Abuse, Bonnie Ahn Jan 2002

The Perceptions Of And Attitudes Toward Partner Abuse Among First Generation Korean-Americans: Their Relationships To The Incidence Of Partner Abuse, Bonnie Ahn

LSU Doctoral Dissertations

The purpose of this study was to examine the influence of the perceptions of and attitudes toward partner abuse, and various demographic characteristics on the incidence of partner abuse among first generation Korean-Americans. The study employed a correlational explanatory design using a cross-sectional survey technique utilizing a total of 223 Korean immigrant adults currently residing in Baton Rouge, Louisiana. A three-part instrument was used for data colleciton. Part I of the instrument measured the perceptions of and attitudes toward domestic violence among Korean-Americans. Part II measured the incedence and nature of domestic violence, and part III inquired demographic information about …

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Development Of Diagnostic Tools For Detecting Expression Of Resistance-Associated Esterases In The Tobacco Budworm, Heliothis Virescens (F.), Huazhang Huang Jan 2002

Development Of Diagnostic Tools For Detecting Expression Of Resistance-Associated Esterases In The Tobacco Budworm, Heliothis Virescens (F.), Huazhang Huang

LSU Doctoral Dissertations

Esterase-based metabolic resistance was studied using biochemical and biological assays with organophosphate (OP)- and pyrethroid (PYR)- resistant tobacco budworms, Heliothis virescens. In biochemical assays, results suggest that: (1) esterase activities toward all substrates used were enhanced in both resistant strains compared with the susceptible strain, suggesting that esterases were involved in resistance; (2) esterase profiles differed depending on the strain and substrate used, and these differences were visualized by using native polyacrylamide gel electrophoresis; 3) esterase activities toward some pyrethroid substrates were significantly higher (P ≤ 0.01) in the PYR-R strain than those in the OP-R strain. These results suggest …

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The Relation Between Electrodermal Activity In Sleep, Negative Activity Affect, And Stress In Patients Referred For Nocturnal Polysomnography, Laura Elaine Lajos Jan 2002

The Relation Between Electrodermal Activity In Sleep, Negative Activity Affect, And Stress In Patients Referred For Nocturnal Polysomnography, Laura Elaine Lajos

LSU Doctoral Dissertations

The study of electrodermal activity (EDA) began over a century ago, and the phenomenon has been linked to many aspects of emotion, arousal and attention. A subset of studies has focused on the occurrence of EDA in sleep (EDAS). These investigations have led to definitive conclusions on when EDA is most likely to occur during the sleep cycle, i.e., slow-wave sleep. Studies have also shown that at least moderate stress tends to increase EDAS, but these studies have fallen short methodologically. The aims of the present study were: (a) to investigate the relation of negative affect and stress to EDAS, …

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Somatic Complaints And Health Care Utilization In Children Exposed To Violence, Kellie Ann Hilker Jan 2002

Somatic Complaints And Health Care Utilization In Children Exposed To Violence, Kellie Ann Hilker

LSU Doctoral Dissertations

In the United States, violence has been referred to as a public health epidemic and violence exposure of our youth is a particularly serious national concern. Numerous negative outcomes are associated with both child victimization and violence exposure including externalizing problems, internalizing symptoms, and poor academic performance. Somatic complaints, which have been associated with internalizing symptoms, have been found as well; however, physical complaints have not been studied in depth. Additionally, health care utilization is an area that is not widely studied in pediatric psychology, but positive associations between posttraumatic stress disorder and increased health care utilization has been found …

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Role Of Chondrocyte Apoptosis In The Pathogenesis Of Equine Osteoarthritis, Dae Young Kim Jan 2002

Role Of Chondrocyte Apoptosis In The Pathogenesis Of Equine Osteoarthritis, Dae Young Kim

LSU Doctoral Dissertations

Osteoarthritis (OA), a non-inflammatory, degenerative disease of articular cartilages, is a common cause of poor performance and early retirement in equine athletes. Pathologically, OA is characterized by matrix degradation and decreased chondrocyte numbers. A mechanical stress is believed to be the major etiologic factor of OA development. Recent studies have indicated that apoptosis is responsible for hypocellularity in OA cartilage and that chondrocyte death by apoptosis could directly contribute to matrix degradation. Increased nitric oxide (NO), a free radical, has been implicated as a cause of chondrocyte apoptosis. No studies, however, have been performed on chondrocyte apoptosis in equine OA. …

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Molecular Systematics, Phylogeography, And Population Genetics Of Xiphorhynchus (Aves: Dendrocolaptidae) In The Amazon Basin, Alexandre Aleixo Jan 2002

Molecular Systematics, Phylogeography, And Population Genetics Of Xiphorhynchus (Aves: Dendrocolaptidae) In The Amazon Basin, Alexandre Aleixo

LSU Doctoral Dissertations

Among those few hypotheses amenable to falsification by phylogenetic methods concerning the diversification of the Amazonian biota, three can be singled out because of their verifiable predictions: the riverine barrier, the gradient, and the basal trichotomy hypotheses. I used phylogenetic and population genetics methods to reconstruct the diversification history of the genus Xiphorhynchus (aves: Dendrocolaptidae) in Amazonia. First, I estimated the phylogeny of the entire genus Xiphorhynchus to test a key prediction of the gradient hypothesis; secondly, I documented phylogeographies of a superspecies associated with upland forest (X. spixii / elegans) and two species linked to floodplain forest (X. kienerii …

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Polyamines As Olfactory Stimuli In Goldfish, Shane Howell Rolen Jan 2002

Polyamines As Olfactory Stimuli In Goldfish, Shane Howell Rolen

LSU Master's Theses

The effects of polyamines as odorants to goldfish olfactory receptors were investigated by in vivo electrophysiological recordings. Electro-olfactogram (EOG) recordings indicated that polyamines (putrescine, cadaverine and spermine) are potent olfactory stimuli for goldfish with estimated electrophysiological thresholds of 10-100nM, similar to that for L-arginine, the most stimulatory amino acid. Although thresholds were similar, the magnitude of the EOG responses to intermediate and high concentrations of polyamines dwarfed those to amino acids and single amine containing compounds (amylamine and butylamine). The EOG responses to 0.1mM putrescine, cadaverine and spermine were, respectively, 4.2x, 4.3x and 10.3x that of the standard, 0.1mM L-arginine. …

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Missiles Of Terror: Hitler's And Hussein's Use Of Ballistic Missiles, Edward Scott Martin Jan 2002

Missiles Of Terror: Hitler's And Hussein's Use Of Ballistic Missiles, Edward Scott Martin

LSU Master's Theses

Adolf Hitler and Saddam Hussein were the only national leaders ever to use large-scale missile launches against American forces and their wartime allies. In both cases, the missiles were too few in number and lacked the accuracy and warhead size to be militarily effective. Use of the V-2 and SCUD missiles showed that conventionally armed ballistic missiles have minimal tactical military value and are more suitable as terrorist weapons. Indeed, the goal of those two meglomaniacal dictators was to terrorize enemy civilians and achieve a political settlement of a hopeless military situation. Each leader hoped to split the Allied coalitions …

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Quantification Of The Spatial Gradient Of Local Volume Fraction From Tomography Images, Yongping Wang Jan 2002

Quantification Of The Spatial Gradient Of Local Volume Fraction From Tomography Images, Yongping Wang

LSU Master's Theses

Asphalt concrete has three constituents: aggregate, asphalt binder and air voids. In the mixture, aggregates serve as a skeleton of the mixture; asphalt serves as a binder to hold the aggregates together; and air voids prevent asphalt concrete from bleeding to avoid plastic mixes. The properties of asphalt concrete are controlled by the interaction of these three components. In asphalt concrete, asphalt binder, voids and aggregates are not uniformly distributed. The local volume fractions of these constituents vary with spatial locations. As a result, there exist a spatial gradient of the local volume fractions between two locations. Due to the …

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Denitrification Potential Of Sediment From A Future Mississippi River Diversion Site In Louisiana, Roy Ryuta Iwai Jan 2002

Denitrification Potential Of Sediment From A Future Mississippi River Diversion Site In Louisiana, Roy Ryuta Iwai

LSU Master's Theses

Denitrification potential was determined in surface sediment from Lake Cataouatche, the receiving basin for a future Mississippi River diversion located in the northern portion of the Barataria Basin estuary. Nitrate removal and denitrification was measured in the laboratory using static sediment microcosms flooded with lake water. Dissolved potassium nitrate (KNO3) was added to the microcosms to achieve: 1) an initial nitrate concentration similar to the mean Mississippi River concentration (~1.4 mg NO3-N l-1), and, 2) a high initial nitrate concentration to elicit a denitrification potential (~50 mg NO3-N l-1). Denitrification …

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