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Lack Of Association Between A Biallelic Polymorphism In The Adducin Gene And Blood Pressure In Whites And African Americans, Nicholas J. Schork, Aravinda Chakravarti, Bonnie Thiel, Myriam Fornage, Howard J. Jacob, Robin Cai, Charles N. Rotimi, Richard S. Cooper, Alan B. Weder Jan 2000

Lack Of Association Between A Biallelic Polymorphism In The Adducin Gene And Blood Pressure In Whites And African Americans, Nicholas J. Schork, Aravinda Chakravarti, Bonnie Thiel, Myriam Fornage, Howard J. Jacob, Robin Cai, Charles N. Rotimi, Richard S. Cooper, Alan B. Weder

Faculty Publications

Population-based candidate gene association analyses are becoming increasingly popular as a result of a greater number of genes and gene polymorphisms having been identified for which some functional information is available. Because many biochemical and physiologic systems impact blood pressure regulation and hypertension susceptibility, many of these identified genes and polymorphisms are candidates for population-level association studies involving blood pressure levels or hypertension status. Recent studies have suggested that the α-adducin gene may harbor polymorphisms that influence blood pressure level. Therefore, we embarked on a study to test one such polymorphism in two large US samples: one from an urban …

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Effect Of Silicon Rate And Host Resistance On Blast, Scald, And Yield Of Upland Price, K. W. Seebold, L. E. Datnoff, F. J. Correa-Victoria, T. A. Kucharek, G. H. Snyder Jan 2000

Effect Of Silicon Rate And Host Resistance On Blast, Scald, And Yield Of Upland Price, K. W. Seebold, L. E. Datnoff, F. J. Correa-Victoria, T. A. Kucharek, G. H. Snyder

Faculty Publications

Blast-resistant, partially resistant, and susceptible cultivars of rice were planted in soil amended with Si at 0, 500, or 1,000 kg/ha at two locations in eastern Colombia to assess differential responses to leaf blast, neck blast, and leaf scald, and to examine the quantity and quality of grains harvested. Leaf and neck blast on partially resistant and susceptible cultivars were reduced by Si as the rate of Si was increased. Depending on the location, the level of severity of leaf and neck blast on partially resistant cultivars, when fertilized with Si at 500 or 1,000 kg/ha, was lowered to that …

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Egg-Derived Proteases As A Block To Polyspermy In The Eggs Of The Freshwater Mussel, Dreissena Polymorpha, Alicia Kay Smith Wysong Jan 2000

Egg-Derived Proteases As A Block To Polyspermy In The Eggs Of The Freshwater Mussel, Dreissena Polymorpha, Alicia Kay Smith Wysong

Honors Capstones

No abstract provided.

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Origin, Distribution, And Degradation Of Sedimentary Organic Matter In A Modern Tropical Deltaic System (Mahakam Delta, Borneo, Indonesia)., Martine Joelle Hardy Jan 2000

Origin, Distribution, And Degradation Of Sedimentary Organic Matter In A Modern Tropical Deltaic System (Mahakam Delta, Borneo, Indonesia)., Martine Joelle Hardy

LSU Historical Dissertations and Theses

The modern, tidally influenced Mahakam Delta progrades onto the eastern Borneo continental shelf. The processes controlling the occurrence and preservation of sedimentary organic matter in a tropical deltaic setting are unknown. Understanding these processes has direct application in explaining the unusual origin of oil and gas generated from terrestrial plant debris (rather than typically from algal remains) in many tropical Miocene basins. Water salinity and dissolved oxygen, and sediment pH, Eh, and TOC were measured. Organic matter was extracted by acid digestion from 200 surface sediment samples collected from the Mahakam River, the delta, and the continental shelf. Seventeen types …

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A Class Of Stable, Globally Noniterative, Nonoverlapping Domain Decomposition Algorithms For The Simulation Of Parabolic Evolutionary Systems., Yu Zhuang Jan 2000

A Class Of Stable, Globally Noniterative, Nonoverlapping Domain Decomposition Algorithms For The Simulation Of Parabolic Evolutionary Systems., Yu Zhuang

LSU Historical Dissertations and Theses

Parabolic systems are governed by time dependent partial differential equations. To obtain a high simulation quality that captures important features of a parabolic system requires solving the governing equation to an adequate accuracy, which necessitates a large sampling size in the spatial and temporal dimensions, and hence a large amount of simulation data and high computing cost. Domain decomposition is an effective method of divide-and-conquer paradigm that divides the problem domain into several subdomains, reducing the original problem into several smaller interdependent problems which can be solved in parallel. In this dissertation, we propose a class of stabilized explicit-implicit time …

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Common Life And Animality In Hume, Peter S. Fosl Jan 2000

Common Life And Animality In Hume, Peter S. Fosl

1650-1850: Ideas, Aesthetics, and Inquiries in the Early Modern Era

No abstract provided.

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Movement And Territoriality Of Wintering Hermit Thrushes In Southeastern Louisiana, David R. Brown, Philip C. Stouffer, Cheryl M. Strong Jan 2000

Movement And Territoriality Of Wintering Hermit Thrushes In Southeastern Louisiana, David R. Brown, Philip C. Stouffer, Cheryl M. Strong

Faculty Publications

We describe the spatial organization and social behavior of Hermit Thrushes (Catharus guttatus) wintering in pine plantations and an adjacent hardwood forest in Tangipahoa Parish, Louisiana over three winters. We used point counts (n = 403) to collect data on agonistic behaviors and relative abundance within the study area. We used mist-netting to study site fidelity on four 9-ha plots within and among years. We used radio-telemetry to measure Hermit Thrushes' movements and territoriality (n = 50). We found that Hermit Thrushes saturated suitable patches within the study area. Most Hermit Thrushes actively defended small [mean = 0.55 ± 0.03 …

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Acifluorfen Sorption, Degradation, And Mobility In A Mississippi Delta Soil, L. A. Gaston, M. A. Locke Jan 2000

Acifluorfen Sorption, Degradation, And Mobility In A Mississippi Delta Soil, L. A. Gaston, M. A. Locke

Faculty Publications

Potential surface water and groundwater contaminants include herbicides that are applied postemergence. Although applied to the plant canopy, a portion of any application reaches the soil either directly or via subsequent foliar washoff. This study examined sorption, degradation, and mobility of the postemergence herbicide acifluorfen (5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acid) in Dundee silty clay loam (fine-silty, mixed, thermic, Aeric Ochraqualf) taken from conventional till (CT) and no-till (NT) field plots. Homogeneous surface and subsurface samples were used in the sorption and degradation studies; intact soil columns (30 cm long and 10 cm diam.) were used in the mobility study. Batch sorption isotherms were …

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Chromosome 17 Aneusomy Detected By Fluorescence In Situ Hybridization In Vulvar Squamous Cell Carcinomas And Synchronous Vulvar Skin, J. Andrew Carlson, Kara Healy, Tien Anh Tran, John Malfetano, Vincent L. Wilson, Angela Rohwedder, Jeffrey S. Ross Jan 2000

Chromosome 17 Aneusomy Detected By Fluorescence In Situ Hybridization In Vulvar Squamous Cell Carcinomas And Synchronous Vulvar Skin, J. Andrew Carlson, Kara Healy, Tien Anh Tran, John Malfetano, Vincent L. Wilson, Angela Rohwedder, Jeffrey S. Ross

Faculty Publications

Vulvar squamous cell carcinoma (SCC) affects a spectrum of women with granulomatous vulvar diseases, human papillomavirus (HPV) infections, and chronic inflammatory vulvar dermatoses. To determine whether there is evidence of chromosomal instability occurring in synchronous skin surrounding vulvar SCCs, we investigated abnormalities in chromosome 17 copy number. Samples of SCC, vulvar intraepithelial neoplasia (VIN), and surrounding vulvar skin were obtained from all vulvar excisions performed for squamous neoplasia at Albany Medical College from 1996 to 1997. Histological categorization, fluorescent in situ hybridization (FISH) for the α satellite region of chromosome 17, DNA content by image analysis, and Ki-67 labeling were …

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Regional Differences In Understanding Between Two Groups Of High School Science Students On A Complex Environmental Science Concept Known As The Dead Zone Of The Gulf Of Mexico: A Web -Based Approach., Sharon Ann Flanagan Jan 2000

Regional Differences In Understanding Between Two Groups Of High School Science Students On A Complex Environmental Science Concept Known As The Dead Zone Of The Gulf Of Mexico: A Web -Based Approach., Sharon Ann Flanagan

LSU Historical Dissertations and Theses

The main research focus of this study was on the regional differences in understanding of two groups of high school science students for a complex environmental scientific phenomenon known as the Dead Zone of the Gulf of Mexico. Participating high school students were drawn from Dead Zone source and effect areas---Iowa chemistry students and Louisiana environmental science students. Students were given a pre- and postinstructional survey concerning environmental issues---including the issue of the Dead Zone or hypoxia of the Gulf of Mexico. The treatment group visited a web site on the Dead Zone constructed for this study, and interacted with …

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The Impact Of Price And Yield Variability On Southeastern U.S. Catfish Producer Operations, Richard F. Kazmierczak Jan 2000

The Impact Of Price And Yield Variability On Southeastern U.S. Catfish Producer Operations, Richard F. Kazmierczak

LSU Agricultural Experiment Station Reports

No abstract provided.

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Lipase And Lipoxygenase Activity, Functionality, And Nutrient Losses In Rice Bran During Storage, Fatemeh Malekian Jan 2000

Lipase And Lipoxygenase Activity, Functionality, And Nutrient Losses In Rice Bran During Storage, Fatemeh Malekian

LSU Agricultural Experiment Station Reports

No abstract provided.

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A Novel Experimental Approach To The Explication Of Information Processing Differences Between High And Low Anxious Individuals., Gina M. Manguno-Mire Jan 2000

A Novel Experimental Approach To The Explication Of Information Processing Differences Between High And Low Anxious Individuals., Gina M. Manguno-Mire

LSU Historical Dissertations and Theses

The information processing perspective of cognition and emotion has been a fruitful area of research inquiry in recent years. As a result of this recent spate of interest, emotional processing biases in anxiety have been consistently demonstrated, indicating that anxious individuals possess a processing priority for threatening information. This study is an attempt to further examine the processing biases which characterize anxious and nonanxious individuals. Pilot work was conducted to investigate the utility of a novel approach, the affective categorization task, to examine the affective meaning of lexical stimuli. Pilot research using the affective categorization task with socially anxious individuals …

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Behavioral Outcome Of Preschoolers Exposed Prenatally To Cocaine: The Role Of The Caregiving Environment., Veronica L. Haynes Jan 2000

Behavioral Outcome Of Preschoolers Exposed Prenatally To Cocaine: The Role Of The Caregiving Environment., Veronica L. Haynes

LSU Historical Dissertations and Theses

This study evaluated the long-term effects of prenatal cocaine exposure on child behavioral outcome at age 5 years, while considering the influence of the postnatal caregiving environment indicated by maternal drug use, maternal psychological functioning, and parenting quality. Behavioral outcome was measured by parent-reported behavior problems on the Achenbach Child Behavior Checklist. Subjects were 210 preschoolers (107 cocaine-exposed and 103 nondrug-exposed) and their biological mothers drawn from a larger cohort of mother-child pairs enrolled at birth in a longitudinal study evaluating the neurodevelopmental outcomes of children prenatally exposed to cocaine. The relationships among prenatal cocaine exposure, maternal adaptation (i.e., maternal …

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Environmental Voting In Congress., John Christopher Howell Jan 2000

Environmental Voting In Congress., John Christopher Howell

LSU Historical Dissertations and Theses

This research project is designed to explore the field of voting on environmental issues in the House of Representatives. A variety of factors are considered in determining why representatives vote as they do; among those factors are party identification, ideology, gender, and region of the country. Special attention is devoted to the difference between those environmental issues in which private property rights are involved and those in which property rights are not at issue. The research project consists of four case studies, each one of an environmental issue. Each case study describes the issue and explains why it is pertinent …

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The Early Local And Regional Immune Response To Recall Inoculations Of Mycobacterium Leprae In The Skin Of Rhesus Macaques (Macaca Mulatta)., Thomas Xavier D Lemarchand Jan 2000

The Early Local And Regional Immune Response To Recall Inoculations Of Mycobacterium Leprae In The Skin Of Rhesus Macaques (Macaca Mulatta)., Thomas Xavier D Lemarchand

LSU Historical Dissertations and Theses

Epidemiological studies have failed to show any important impact of human immunodeficiency virus (HIV) infection and disease on leprosy, in contrast to the well documented increase in incidence and morbidity with other mycobacteria in these patients, notably Mycobacterium tuberculosis. The early events following exposure and repeated exposure to Mycobacterium leprae (ML) have not still been studied. Previous studies of first inoculations of ML in the skin of rhesus monkeys have indicated delayed recruitment of CD4+ cells and delayed interleukin (IL) 2 secretion in skin inoculation sites in simian immunodeficiency (SIV) positive animals. The development of the secondary immune response against …

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Dna Alkylation And Its Repair In Small Fish Species., Thomas James Vicek Jan 2000

Dna Alkylation And Its Repair In Small Fish Species., Thomas James Vicek

LSU Historical Dissertations and Theses

Mechanisms of DNA alkylation and repair were investigated in 3 small fish species. Following aqueous exposure to either N-methyl- N'-nitro-N-nitrosoguanidine or ethyl methanesulfonate, the hepatic DNA from the western mosquitofish, Gambusia affinis, was analyzed for alkyl-DNA adducts via high performance liquid chromatography - mass spectrometry/mass spectrometry. Although potential tissue detection limits ranged from 14--101 fmoles of alkyl adducts/mg tissue, no alkyl-DNA adducts were detected in the exposed tissues. To assess the potential repair of alkyl-DNA adducts in 2 other small fish species, alkyltransferase activities within hepatic protein extracts of the Gulf killifish, Fundulus grandis, and Gambusia affinis were determined using …

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Biometrical Models For Predicting Future Performance In Plant Breeding., Monica Graciela Balzarini Jan 2000

Biometrical Models For Predicting Future Performance In Plant Breeding., Monica Graciela Balzarini

LSU Historical Dissertations and Theses

The plant breeding process begins with the selection of parents and crosses. Promising progeny from these crosses progress through a series of selection stages that typically culminate in multi-environment trials. I evaluated best linear unbiased predictors (BLUP), other predictors and prediction models at the initial (cross prediction), early replicated testing and late (multi-location) stages of a sugarcane breeding selection cycle. Model and predictor accuracy was assessed in the first two stages by using cross-validation procedures. I compared statistical models of progeny test data in their ability to predict the cross performance of untested sugarcane crosses. Random parental effect predictors and …

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Anxiety And Orange Blossoms: Sexual Economics In Wedding Texts By Grace Lumpkin, Eudora Welty, And Alice Childress., Ida Maxwell Wells Jan 2000

Anxiety And Orange Blossoms: Sexual Economics In Wedding Texts By Grace Lumpkin, Eudora Welty, And Alice Childress., Ida Maxwell Wells

LSU Historical Dissertations and Theses

This study examines how problematic representations of brides reflect anxiety about women's roles in the marriage market of the early twentieth-century United States in Grace Lumpkin's The Wedding, Eudora Welty's Delta Wedding, and Alice Childress's Wedding Band: A Love /Hate Story in Black and White. The study develops a theoretical model of stages young women negotiate in order to participate in the sexual economic process underlying the marriage exchange: initiate, self-fashioner, marriageable woman, bride, wife, and mother. In moving through these stages, the young woman increasingly loses her identity as she fashions herself into the socially-constructed persona "lady," or marriageable …

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Advanced Oxidation Processes For Remediation Of Explosives -Contaminated Soils., Elizabeth Covington Fleming Jan 2000

Advanced Oxidation Processes For Remediation Of Explosives -Contaminated Soils., Elizabeth Covington Fleming

LSU Historical Dissertations and Theses

Explosives contamination in soils is an environmental concern for the public due to their toxic effects. The United States Department of Defense (DoD) is particularly concerned with explosives contamination in soils due to the thousands of sites for which it is responsible for remediating. To date, the most common technology utilized for remediating explosives contamination in soils has been incineration. However, costs for incineration have been estimated to range from approximately $250 to $3250 per ton and are generally inversely related to the volume of soil. The use of advanced oxidation processes (AOPs), including dark and illuminated forms, was evaluated …

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The Effects And Mechanism Of Action Of Cimetidine On Inducible Nitric Oxide Synthase Using An Equine Soft-Tissue Inflammation Model., Robert Paul Hunter Jan 2000

The Effects And Mechanism Of Action Of Cimetidine On Inducible Nitric Oxide Synthase Using An Equine Soft-Tissue Inflammation Model., Robert Paul Hunter

LSU Historical Dissertations and Theses

Cytochrome P-450 (CYP) and inducible nitric oxide synthase (iNOS) are similar heme containing enzymes. Cimetidine (CIM) is an H2 antagonist, and since CIM inhibits CYP, it may also bind to the heme-iron of NOS and reduce NO generation. Six horses each had three tissue chambers inserted subcutaneously on either side of the neck for Trial 1. Trial 2 also used 6 female Thoroughbred horses implanted with at least two tissue chambers as in Trial 1. Blood and tissue chamber fluid (TCF) were sampled at -24, 0, 4, 8, 12 h and at 1, 2, 3, 5, and 7 days after …

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American Alligator Nesting Ecology In Impounded Marsh Habitat, Louisiana., Steven Richard Reagan Jan 2000

American Alligator Nesting Ecology In Impounded Marsh Habitat, Louisiana., Steven Richard Reagan

LSU Historical Dissertations and Theses

The goal was to monitor a large number of female alligators over a 3-year period to obtain information on alligator nesting ecology. This dissertation, although designed to estimate annual nesting rates, provides additional meaningful information on methods of capture, tag retention rates, nest spacing patterns, segregation of size classes, nest site fidelity, the relationship between attendance and nest success, the effects of fire ants on alligator nest success, the relationship between hatchling alligators and their mother, and hatchling dispersal. Passive integrated transponder (PIT), monel web, and cranial mounted reflector tags were evaluated for marking and identifying alligators. Use of harmonic …

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Traumatic Life Events, Posttraumatic Stress Disorder, And Health Outcomes In A Low -Income, Primary Care Population., Bradford West Applegate Jan 2000

Traumatic Life Events, Posttraumatic Stress Disorder, And Health Outcomes In A Low -Income, Primary Care Population., Bradford West Applegate

LSU Historical Dissertations and Theses

Research suggests that individuals with Posttraumatic Stress Disorder (PTSD) have significant dysregulation in a number of physiological indices, especially the sympathetic nervous system (SNS) and hypothalamic-pituitary-adrenal (HPA) axis. Biological theories of PTSD propose that prolonged SNS and HPA axis dysregulation places individuals with PTSD at risk for development of medical morbidity and impairments in health status. The present study examined the following research questions: (a) what is the prevalence of traumatic life events and PTSD in a low-income primary care population? (b) does PTSD predict impairments in self-reported health status after controlling for age, alcohol abuse, tobacco use, and obesity? …

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Effects Of Bacillus Thuringiensis Transgenic Cotton On Soybean Looper, Pseudoplusia Includens (Walker) (Lepidoptera: Noctuidae): Larval Development, Mortality, Population Dynamics, And Resistance Management On Soybean., Christopher Glen Clemens Jan 2000

Effects Of Bacillus Thuringiensis Transgenic Cotton On Soybean Looper, Pseudoplusia Includens (Walker) (Lepidoptera: Noctuidae): Larval Development, Mortality, Population Dynamics, And Resistance Management On Soybean., Christopher Glen Clemens

LSU Historical Dissertations and Theses

In laboratory bioassays, total mortality (neonate to pupation) among Bt-cotton varieties ranged from 13 to 89%; however, only cvs. CK 312/531, NuCOTN 33B, and PM 1220 RR/BG caused greater mortality than the soybean and meridic diet controls. Several Bt-cotton hosts increased larval developmental time, but none of the commercial Bt-cotton varieties (excluding CK 312/531) significantly affected adult longevity, generation time, doubling time, or intrinsic rate of increase (rm). Soybean looper larval and predator densities were monitored in soybean fields to determine the impact of Bt-cotton production on soybean looper seasonal abundance. Throughout the study, peak soybean looper larval densities were …

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Intestinal Bioavailability And Biotransformation Of 3,4,3',4'-Tetrachlorobiphenyl In The Channel Catfish, Ictalurus Punctatus., Adriana Maria Doi Jan 2000

Intestinal Bioavailability And Biotransformation Of 3,4,3',4'-Tetrachlorobiphenyl In The Channel Catfish, Ictalurus Punctatus., Adriana Maria Doi

LSU Historical Dissertations and Theses

These studies examined the role of micelle fatty acid composition, contaminant body burden, biotransformation, and non-specific toxicity on the systemic bioavailability of 3,4,3',4'-tetrachlorobiphenyl (TCB) from the intestine of catfish, as well as the effect of TCB upon the vectorial transporter p-glycoprotein (pgp). Initial in vitro experiments demonstrated that the solubility of [14C]-TCB in micelles was favored by longer chain fatty acids, with higher [14C]-TCB solubility correlating to greater systemic bioavailability of [14C]-TCB in an in situ preparation. The systemic bioavailability of [14C]-TCB was demonstrated to be affected by in vivo exposures to TCB, in a dose-independent manner, and apparently unrelated …

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Indices Of Exposure To Polycyclic Aromatic Hydrocarbons In A Bioindicator Species: Point Mutation Detection In The Cotton Rat., Christine H. Lemarchand-Carpentier Jan 2000

Indices Of Exposure To Polycyclic Aromatic Hydrocarbons In A Bioindicator Species: Point Mutation Detection In The Cotton Rat., Christine H. Lemarchand-Carpentier

LSU Historical Dissertations and Theses

Release of energy-related contaminants occurs ubiquitously in the environment. Cancer induction by polycyclic aromatic hydrocarbons (PAHs) and aromatic amines have been well recognized in the workplace and are also suspected among the general population. Environmental PAHs exposure and effects have been investigated using biomarkers in aquatic and, to a lesser extent, terrestrial animals. Attempts to monitor the presence and effects of PAHs through the detection of point mutations in genes involved in carcinogenesis (p53 and K-ras) would yield interesting clues regarding possible etiologic agents and their potential effect. The identification of a mutation type, known to be G→T transversion predominantly …

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Pathogenesis Of Bartonella Henselae In The Domestic Cat: Use Of A Pcr-Based Assay For The Detection And Differentiation Of B. Henselae Genotype I And Genotype Ii In Chronically Infected Cats., Alma Faye Roy Jan 2000

Pathogenesis Of Bartonella Henselae In The Domestic Cat: Use Of A Pcr-Based Assay For The Detection And Differentiation Of B. Henselae Genotype I And Genotype Ii In Chronically Infected Cats., Alma Faye Roy

LSU Historical Dissertations and Theses

Bartonella henselae is a zoonotic agent in which the domestic cat serves as the natural reservoir, and humans acquire potentially serious infections associated with this microorganism. The purpose of this research is to contribute to the understanding of the pathogenesis of B. henselae in the domestic cat using a molecular approach. Using sequence differences in a portion of the I 6S rRNA gene between B. henselae genotype I, and B. henselae genotype II, a nested polymerase chain reaction (nPCR) was designed and used to investigate various phases of feline bartonellosis. The nPCR detected 3.2 organisms per milliliter of blood which …

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The Effects Of Dietary Fatty Acids And Non -Steroidal Anti -Inflammatory Drugs On Cyclooxygenase-2 Expression., Kyung-Hee Sohn Jan 2000

The Effects Of Dietary Fatty Acids And Non -Steroidal Anti -Inflammatory Drugs On Cyclooxygenase-2 Expression., Kyung-Hee Sohn

LSU Historical Dissertations and Theses

Dietary n-3 fatty acids and non-steroidal anti-inflammatory drugs (NSAIDs) were shown to have cancer preventive and tumor regressive effects. Fatty acids and NSAIDs are substrate and inhibitors, respectively, of cyclooxygenase-2 (COX-2), which is a key enzyme in the conversion of arachidonic acids to prostaglandins. Thus, the modulating effects of different types of dietary fatty acids and NSAIDs on the expression of COX-2 are studied here. Results show that both n-3 and n-6 polyunsaturated fatty acids (PUFAs) inhibit Lipopolysaccharide (LPS)-induced COX-2 expression and NF-kappaB activation in macrophages. Results from in vitro cell proliferation study indicate that growth of colon tumor cells …

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Active Site Interactions And Kinetic Characterization Of C- And N-Nitroso And Peroxidic Substrates With Alcohol Dehydrogenase: Mechanistic Insights From Studies Of The Cobalt -Substituted Enzyme., Alexander Gregory Tkachenko Jan 2000

Active Site Interactions And Kinetic Characterization Of C- And N-Nitroso And Peroxidic Substrates With Alcohol Dehydrogenase: Mechanistic Insights From Studies Of The Cobalt -Substituted Enzyme., Alexander Gregory Tkachenko

LSU Historical Dissertations and Theses

The interaction of ADH with C-nitroso, N-nitroso and peroxide substrates was investigated. To better elucidate the mechanism of these interactions, cobalt-substituted HLADH was introduced and compared with native HLADH. Both binary and ternary complexes of p-nitrosophenol with Co(II)ADH caused a blue-shift of the d-d transition region of the Co(II)ADH spectrum, indicating direct interaction of the C-nitroso moiety with the metal active site. In addition to this blue shift with NADH, both pNSP and N,N'-dimethyinitrosamine enhance the absorbance of the 643 nm peak of the ADH/NADH/pyrazole ternary complex, which suggests that these compounds compete with pyrazole for ligand association with the …

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Boron -Uptake Mechanisms And Boron Nutrition Of Rice., Xiaohe Yu Jan 2000

Boron -Uptake Mechanisms And Boron Nutrition Of Rice., Xiaohe Yu

LSU Historical Dissertations and Theses

There are very few studies on B deficiency in rice (Oryza sativa L.). Reported critical values of B deficiency in rice are contradictory and mechanisms of B uptake by plant are not understood. Objectives of this study were to determine B effects on rice grown in hydroponics and soil; to determine critical values of B deficiency in rice tissues, hydroponic solution and soil; and to explore B-uptake mechanisms in both monocots (rice) and dicots (soybean (Glycine max L.)). Rice was grown to maturity in an acid Caddo silt loam at 0 and 1 kg B ha--1 in a greenhouse study, …

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