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Physiology And Lateralization Of Swallowing: A Comparison Between Young And Old Adults., Stephanie Kay Daniels
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. …
A Spatial Inquiry Of Infant Low Birthweight And Cancer Mortality In East Baton Rouge Parish, Louisiana., Esra Ozdenerol
A Spatial Inquiry Of Infant Low Birthweight And Cancer Mortality In East Baton Rouge Parish, Louisiana., Esra Ozdenerol
LSU Historical Dissertations and Theses
Infant low birthweight rate in East Baton Rouge Parish is higher compared to the nation. Cancer is one of the most serious health problems in Louisiana. A few studies have indicated a relationship between the two health outcomes and their environment, but conclusions from these studies have not always been consistent. The spatial and temporal scales of the data and the methods used in these studies contribute to the inconsistent and uncertain results. The spatial patterns of infant low birthweight and cancer mortality in East Baton Rouge Parish from 1993 to 1996 and their relationships with environmental factors at three …
Effects Of Dietary L -Carnitine On Female Retired Breeder Rats Fed High Protein And High Fat., Erika Maria Zablah-Bendeck
Effects Of Dietary L -Carnitine On Female Retired Breeder Rats Fed High Protein And High Fat., Erika Maria Zablah-Bendeck
LSU Historical Dissertations and Theses
Carnitine supplementation has been shown to protect animals from ammonia toxicity following an ammonium acetate infusion and to alter body composition (i.e. increase lean mass and decrease body fat) in younger animals. The aims of this study were to address the questions of whether: (1) carnitine lowers blood ammonia levels of rats fed high protein; (2) carnitine decreases the weight gain and body fat of older animals fed high fat; (3) carnitine decreases glucose-induced insulin secretion; and (4) consumption of a high fat diet increases total serum carnitine content. Sprague Dawley retired female breeder rats (n = 64) were stratified …
Professional Versus Caregiver Ratings Of The Communicative Abilities Of Adults Displaying Moderate To Profound Communication Challenges., Paul Steven Miller
Professional Versus Caregiver Ratings Of The Communicative Abilities Of Adults Displaying Moderate To Profound Communication Challenges., Paul Steven Miller
LSU Historical Dissertations and Theses
Ninety caregivers of 30 adults with moderate-to-serve cognitive, sensory, and physical challenges living in an institutional setting participated in this study to investigate caregiver perceptions of communicative abilities. A mixed effects design was used to compare communication scores of thirty adults. The adults were assigned to three communication proficiency groups. The communicative scores with challenges that were generated with three different assessment activities: a direct/participatory evaluation conducted by a certified speech-language pathologist, an interview of the caregivers, and an observation of daily routine activities. Results indicated that all of the rating procedures differentiated the three communication proficiency groups. Correlations between …
Intestinal Bioavailability And Biotransformation Of 3,4,3',4'-Tetrachlorobiphenyl In The Channel Catfish, Ictalurus Punctatus., Adriana Maria Doi
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 …
Indices Of Exposure To Polycyclic Aromatic Hydrocarbons In A Bioindicator Species: Point Mutation Detection In The Cotton Rat., Christine H. Lemarchand-Carpentier
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 …
The Effects And Mechanism Of Action Of Cimetidine On Inducible Nitric Oxide Synthase Using An Equine Soft-Tissue Inflammation Model., Robert Paul Hunter
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 …
Characterization Of The Microsomal Mixed -Function Oxidase System Of Several Species Of Sea Anemones (Phylum: Cnidaria)., Linda Marie Heffernan
Characterization Of The Microsomal Mixed -Function Oxidase System Of Several Species Of Sea Anemones (Phylum: Cnidaria)., Linda Marie Heffernan
LSU Historical Dissertations and Theses
Several studies have demonstrated detrimental effects of anthropogenic compounds on coral reef communities. These compounds are known to be bioaccumulated rapidly, but eliminated slowly by anthozoans (i.e., corals and sea anemones). The cytochrome P450-dependent mixed function oxidase (MFO) system is the primary pathway for initial oxidation of many hydrophobic exogenous compounds; however, its presence had not been well documented in anthozoans. The studies reported herein show that a functional cytochrome P450-dependent MFO is present in the microsomal fraction of the sea anemones Anthopleura xanthogrammica , A. elegantissima, and Bunodosoma cavernata . The evidence is based on the presence of classical …
Studies On Cyclooxygenase-2 Expression In Lipopolysaccharide-Stimulated Macrophages., Byeong Churl Jang
Studies On Cyclooxygenase-2 Expression In Lipopolysaccharide-Stimulated Macrophages., Byeong Churl Jang
LSU Historical Dissertations and Theses
Cyclooxygenase (COX) is the key enzyme in the biosynthesis of prostaglandins (PGs) known as pro-inflammatory mediators. COX has two isoforms: the constitutively expressed COX-1 and the mitogen-inducible COX-2. It has been demonstrated that COX-2 expression is selectively induced by lipopolysaccharide (LPS) treatment after several hours in rat alveolar macrophages (Lee et al., 1992; Chanmugam et al., 1995). The mitogen-activated protein kinases [MAPKs; extracellular signal-regulated kinases (ERKs), P38, and c-jun N-terminal kinases (JNKs)], nuclear factor kappa B (NF-kB), and Lyn kinase are known to be activated in the early stages (within minutes) of LPS signaling pathways. In the current study, the …
Women's Health Issues In Baccalaureate Nursing Curricula., Karen Basham Moody
Women's Health Issues In Baccalaureate Nursing Curricula., Karen Basham Moody
LSU Historical Dissertations and Theses
The primary purpose of this study was to determine if, and how, selected women's health issues are included in baccalaureate nursing curricula in the United States. The study also assessed nursing faculty's perceptions of the importance of these selected women's health issues to nursing curricula. Two hundred sixty baccalaureate nursing programs were randomly selected from a population of 604 1998 National League for Nursing accredited baccalaureate nursing programs in the United States. A three-part researcher developed women's health survey instrument was used for data collection. The instrument consisted of questions pertaining to 19 women's health issues which were selected through …
Risk Management Of Aflatoxin Through Mutagenic Potential Modification And Toxin Formation By Intrinsic Components In Food., Syed Shahid Ali
Risk Management Of Aflatoxin Through Mutagenic Potential Modification And Toxin Formation By Intrinsic Components In Food., Syed Shahid Ali
LSU Historical Dissertations and Theses
Aflatoxins are the secondary metabolites of Aspergillus flavus and their presence in food and feed crops is unavoidable. This study evaluates the antimutagenic properties of phytic and linoleic acids in aflatoxin-affected food. A reduction in the number of revertants was a function of an increased concentration of phytic/linoleic acids and phosphotidylinositol in the Salmonella/microsomal mutagenicity assay (tester strains TA-100 and TA-98) with and without metabolic activation (S-9). Linoleic acid (10 and 100 mug/plate) and phosphotidylinositol (25mug/plate) were antimutagenic against most of the mutagens tested. Although a reduction in the number of revertants was observed in the phytic acid treatments, the …
The Effect Of Exercise On Immune Function In Equids., Robert William Folsom
The Effect Of Exercise On Immune Function In Equids., Robert William Folsom
LSU Historical Dissertations and Theses
The effect of exercise stress on immune modulation and the mechanisms involved were examined in ponies and horses subjected to a strenuous treadmill-based exercise program. The magnitude of changes in exercise-induced cortisol production, lactate, and immunomodulation increased with increases in exercise intensity and the highest levels of each were seen in animals that attained heart rates greater than 200 bpm. Influenza vaccinated ponies and horses were exercised at heart rates greater than 200 bpm for 5 consecutive days and stress tests were performed on days 1 and 5. Exercised animals exhibited significant increases in plasma lactate, plasma cortisol, LAK cell …
Effects Of Selected Polycyclic Aromatic Hydrocarbons On Cell Proliferation, Protein Phosphorylation, And Intracellular Calcium Concentration In Lepomis Macrochirus., Helen Runnels Connelly
Effects Of Selected Polycyclic Aromatic Hydrocarbons On Cell Proliferation, Protein Phosphorylation, And Intracellular Calcium Concentration In Lepomis Macrochirus., Helen Runnels Connelly
LSU Historical Dissertations and Theses
Polycyclic aromatic hydrocarbons (PAH) have been demonstrated to affect signal transduction in higher vertebrates. In this research, the freshwater species of fish, Lepomis macrochirus (bluegill) was used to test the effects of a 14-day diet of PAH on lymphocyte signal transduction. PAH tested included: 2-aminoanthracene (2-AA), 2-methylnaphthalene (2-MN), 9,10-dimethylanthracene (9,10-DMA), and a mixture of these three compounds (MIX). Individual compounds were tested at a total PAH dose of 3.1 $\pm$ 0.01mg over the 14 day period. The MIX diet was a total PAH dose of 0.13 $\pm$ 0.01mg 2-AA, 0.19 + 0.01mg 9,10-DMA, and 0.22 $\pm$ 0.02mg 2-MN over the …
Evaluation Of The Toxicological Consequences Of Dietary Exposure To Individual Classes Of Polycyclic Aromatic Hydrocarbons Or A Mixture In The Fischer-344 Rat., Mary Durand Boudreau
Evaluation Of The Toxicological Consequences Of Dietary Exposure To Individual Classes Of Polycyclic Aromatic Hydrocarbons Or A Mixture In The Fischer-344 Rat., Mary Durand Boudreau
LSU Historical Dissertations and Theses
There is special concern about the potential health effects of by-products released into the environment after combustion or conversion of fossil fuels. Polycyclic aromatic hydrocarbons (PAH), while initially released largely into the atmosphere, are subsequently deposited in soil and water and on foods. Although the significance of PAH contamination with regard to environmentally caused diseases and cancer in humans is difficult to estimate, it is suggested that the potential hazards may be underestimated. In an effort to understand the potential adverse health effects of PAHs, a comprehensive study was undertaken to determine the metabolic fate of selected PAHs as individual …
The Effect Of Pulmonary Infection (Actinobacillus Pleuropneumoniae), Endotoxin And Dexamethasone On Enrofloxacin Pharmacokinetic Parameters In Swine., Lynn O. Post
LSU Historical Dissertations and Theses
Efficacy studies are often done on diseased animals while pharmacokinetic studies are done on healthy animals. Disease models are inherently difficult to standardize because of the many variables associated with measuring pharmacokinetic parameters in abnormal animals. Information derived from pharmacokinetic studies with diseased animals could be useful to determine if therapeutic doses of a drug or antimicrobial becomes less effective or toxic due to changes in distribution and clearance. The objectives of this study were to: characterize a pulmonary infection model in swine using Actinobacillus pleuropneumoniae; evaluate the pharmacokinetic changes associated with the pulmonary infection model and dexamethasone after the …
Association Of Environmental And Climatic Factors In The Epidemiology Of American Visceral Leishmaniasis In Northeast Brazil Using Remote Sensing And Geographical Information System Methods., Roland Alexander Thompson
Association Of Environmental And Climatic Factors In The Epidemiology Of American Visceral Leishmaniasis In Northeast Brazil Using Remote Sensing And Geographical Information System Methods., Roland Alexander Thompson
LSU Historical Dissertations and Theses
This study associated climatic and environmental factors with the incidence of visceral leishmaniasis (calazar) in Northeast Brazil. Remote sensing (RS) techniques permitted evaluation of spatial and temporal landscape features to stratify the region and define the target population for this vector-borne disease. The Municipality of Caninde, Ceara, Brazil was divided into 873-- 2 x 2 km2 squares centered on coordinates from a Universal Transverse Mercator projection (scale 1:100,000, 1994) and geo-referenced with 2 Landsat T.M. (TM) scenes (September 26, 1976 and July 2, 1996). The assignment of squares into foothills, plains or city strata was based on vegetative categories determined …
Perception-Action Coupling During Goal-Directed Locomotion Without Vision., Robert D. Clark
Perception-Action Coupling During Goal-Directed Locomotion Without Vision., Robert D. Clark
LSU Historical Dissertations and Theses
The ability to walk to distant targets accurately without the use of vision has been demonstrated in a number of studies (e.g., Elliott, 1987; 1990; Loomis, Da Silva, Philbeck, & Fukusima, 1996; Rieser, Ashmead, Talor, & Youngquist, 1990; Steenhuis & Goodale 1988; Thomson, 1983). Processes underlying the mechanisms involved in this ability however, are not completely understood. One possible mechanism examined involves non-visual sensory flows during locomotion. In Experiment 1, manipulations to normal walking led to significant increases in error relative to the control group. Error expressed as a percentage of target distance revealed that target distance did not affect …
The Physiological And Psychological Responses To Submaximal Exercise At Different Times In Renal Disease Patients., Marta Amaral-Melendez
The Physiological And Psychological Responses To Submaximal Exercise At Different Times In Renal Disease Patients., Marta Amaral-Melendez
LSU Historical Dissertations and Theses
This study investigated cardiorespiratory, hematological, and psychological responses to acute submaximal exercise, and recovery in end stage renal disease patients. Five African-American males on hemodialysis, were randomly assigned to three exercise treatments (30 minutes on the treadmill at 60% VO$\sb2$ peak): pre dialysis (2 hours before), post dialysis (1 hour after), and off dialysis (24 hours after last dialysis). The cardiorespiratory (CR) variables were: ventilation (V$\sb{\rm E}$), oxygen consumption (VO$\sb2$), carbon dioxide production (VCO$\sb2$), respiratory exchange ratio (R), and kilocalories (KCAL/min). The hematological variables were: blood urea nitrogen (BUN), creatinine (Cr), albumin (Al), total protein (Tp), glucose (Gl), sodium (Na$\sp{++}$), …
Purification And Antioxidant Properties Of Rice Bran (Gamma)-Oryzanol Components., Zhimin Xu
Purification And Antioxidant Properties Of Rice Bran (Gamma)-Oryzanol Components., Zhimin Xu
LSU Historical Dissertations and Theses
A high purity $\gamma$-oryzanol was obtained from crude rice bran oil using a normal phase preparative scale HPLC. It was used in implementing a reverse phase HPLC method for separating each individual component of $\gamma$-oryzanol present in rice bran oil. Ten fractions were isolated in the reverse phase HPLC method. The ten components of $\gamma$-oryzanol were identified. Three of these, cycloartenyl ferulate, 24-methylene cycloartanyl ferulate, and campesteryl ferulate, were major components of $\gamma$-oryzanol. The yield of $\gamma$-oryzanol without saponification was significantly higher than that with saponification in solvent extraction. The solvent mixture with 50% hexane and 50% isopropanol (v/v.) at …
Using Scaffolded Interaction To Improve Lld Readers' Inferencing And Narrative Abilities., Kathryn Patrice Dekemel
Using Scaffolded Interaction To Improve Lld Readers' Inferencing And Narrative Abilities., Kathryn Patrice Dekemel
LSU Historical Dissertations and Theses
A time series control group study was completed to investigate the efficacy of Communicative Reading Strategies (CRS) as an instructional approach for improving the oral reading, question answering, and narrative retelling abilities of LLD students. The participants were 10 LLD students who ranged in age from 9 to 12 years and 5 reading-age matched (RAM) peers who ranged in age from 7 to 9 years. Five of the LLD subjects were randomly assigned to a treatment group (TLD), while the remaining 5 LLD subjects were assigned to a no-treatment group (NLD). All three groups participated in a series of probes …
A Comparative Study Of Communication Intervention For Nonverbal Children With Autism., Kelly C. Higgins
A Comparative Study Of Communication Intervention For Nonverbal Children With Autism., Kelly C. Higgins
LSU Historical Dissertations and Theses
Communication intervention for 3 nonverbal children with autism was compared in an alternating treatment design. Subjects were three males, ages 4--7, 3--6, and 3--5 who met diagnostic criteria for Autism and who were considered to be nonverbal according to developmental history, parent/teacher report and behavioral observation. Alternating treatment conditions included the established treatment format that each subject was receiving in his school setting (Treatment A) and a developmentally-integrated format of intervention structured to facilitate integrated cognitive, social and communicative development (Treatment B). Each intervention was characterized according to profiles of Traditional-Behavioral or Semantic Pragmatic-Developmental intervention formats. Characteristics of adult interaction …
Beta-Carotene And Exercise Performance: Effects On Race Performance, Oxidative Stress, And Maximal Oxygen Consumption., Kim Edward Leblanc
Beta-Carotene And Exercise Performance: Effects On Race Performance, Oxidative Stress, And Maximal Oxygen Consumption., Kim Edward Leblanc
LSU Historical Dissertations and Theses
There is evidence in the literature that suggests a possible worthwhile role of antioxidants during athletic endeavors and exercise performance. Several studies have evaluated the antioxidant ability of beta-carotene and demonstrated a beneficial influence. However, these studies have investigated beta-carotene's effects within an antioxidant mixture which included other antioxidant vitamins. Consequently, this study attempted to isolate the antioxidant role of beta-carotene during exercise. Three parameters of beta-carotene influence were measured using eleven well-trained runners: serum malondialdehyde (MDA) concentration (a marker of free radical generation), 5000 meter race performance, and maximum oxygen consumption (VO2max). Subjects were tested using a double-blinded cross-over …
The Effects Of Hypoestrogenism On Rest And Acute Submaximal Exercise Metabolism Using A Gnrh Agonist Analogue Model., Sheri Anne Melton
The Effects Of Hypoestrogenism On Rest And Acute Submaximal Exercise Metabolism Using A Gnrh Agonist Analogue Model., Sheri Anne Melton
LSU Historical Dissertations and Theses
During menopause, many women experience weight gain which is mostly in the form of abdominal and upper body fat deposition. This phenomenon has been recognized as an independent predictor of cardiovascular disease in females. Other disease processes, such as diabetes, hypertension and some cancers, specifically, breast and esophageal have been linked to obesity. Thus, the occurrence of increased body fat is placing the postmenopausal female in jeopardy of a potential life-threatening position. The connection between the lack of estrogen seen in menopause and weight gain remains unclear, but studies have shown that estrogen status may affect carbohydrate and fat metabolism. …
A Methodology To Assess Safety Conditions In Louisiana Agriscience Laboratories., Julio Alcibiades Melendez
A Methodology To Assess Safety Conditions In Louisiana Agriscience Laboratories., Julio Alcibiades Melendez
LSU Historical Dissertations and Theses
The safety conditions of the agriscience laboratories of the high schools of the State of Louisiana have not been studied extensively. This study was undertaken to develop a methodology to assess these conditions. The Southeastern region of the state was selected as the research area. Forty four high schools in this area have agriscience laboratories. Forty one of these laboratories were assessed. A Hypothesized Survey Model was made up from the background information searched. This model was validated at another school region and used to design a Research Survey Model. This RSM was face and field validated. Safety ratings were …
Geographic Information Systems For Schistosomiasis In Brazil., Maria Emilia Bavia
Geographic Information Systems For Schistosomiasis In Brazil., Maria Emilia Bavia
LSU Historical Dissertations and Theses
This study has identified environmental factors influencing the distribution of schistosomiasis and the prevalence of the disease in the population in the state of Bahia, Brazil. The Intergraph Modular Environmental Systems nucleus (MGE), a geographic information system (GIS), was applied to 30 municipalities in Bahia to establish a descriptive and quantitative study of the spatial and temporal dynamics of infection. The GIS was constructed by digitizing maps of soil type, vegetation, topology, and hydrologic features including temperature, rainfall, and seasonal pattern of precipitation, prevalence of schistosomiasis, and the distribution of snails, which are the intermediate hosts of the disease. The …
Efficacy Of Communicative Reading Strategies As An Instructional Approach For Adult Low-Ability Readers., Sara S. Reichmuth
Efficacy Of Communicative Reading Strategies As An Instructional Approach For Adult Low-Ability Readers., Sara S. Reichmuth
LSU Historical Dissertations and Theses
Twelve adult low-ability readers participated in a pretest-posttest control group study investigating the efficacy of Communicative Reading Strategies (CRS) as an instructional reading approach. Six adults received CRS instruction and constituted the experimental group. The remaining six adults received skill-based instruction and served as the control group. All participants demonstrated instructional level reading skills at or below a fifth grade level and completed 40 hours of instruction. Changes in performance on measures of word recognition, comprehension, and reading rate from pretest to posttest were used to compare CRS and control groups. Results of Mann Whitney U analyses revealed that both …
Factors Influencing Completion Status Of Undergraduate Nursing Students Who Initiate Progression Appeals., Karen Diane Hadskey Blanchard
Factors Influencing Completion Status Of Undergraduate Nursing Students Who Initiate Progression Appeals., Karen Diane Hadskey Blanchard
LSU Historical Dissertations and Theses
The purpose of this descriptive research study was to determine the existence of predictors for success of nursing students who are granted appeals, based on special circumstances, by the University Progression and Retention Committee of Southeastern Louisiana University. This study investigated demographics (age, marital status, gender, race, residence, semester of appeal, and educational background) of 302 nursing students from Southeastern Louisiana University (January 1988, to May 1995) that appealed to the Progression and Retention Committee of the university to continue in the nursing program. Success predictor criteria provided to nursing faculty and students can be used as a positive resource …
Inflammatory Responses Of The Jird To Brugia Pahangi: Parasite Stage Specificity And Role Of The Macrophage., Carmen Nasarre
Inflammatory Responses Of The Jird To Brugia Pahangi: Parasite Stage Specificity And Role Of The Macrophage., Carmen Nasarre
LSU Historical Dissertations and Theses
The host systemic and peritoneal inflammatory responses against different stages of Brugia pahangi were compared in intraperitoneally infected-jirds. Systemic inflammatory responses were assessed by measuring the pulmonary granulomatous response to B. pahangi antigen-coated beads (PGRN). Peritoneal inflammation was characterized by enumeration of different cell types in peritoneal exudates following infection. Further, the toxoplasmacidal activity and TNF-$\alpha$-like production of peritoneal macrophages were also characterized. Infection with L3, L4, male worms, female worms, microfilariae (MF) or dead adult worms induced a rapid PGRN. This response decreased to levels of controls in jirds inoculated with living parasites at the chronic time period, indicating …
Conditioning The Auditory System With Continuous Versus Interrupted Noise Of Equal Acoustic Energy: Is Either Exposure More Protective?, Ruth Ann Skellett
Conditioning The Auditory System With Continuous Versus Interrupted Noise Of Equal Acoustic Energy: Is Either Exposure More Protective?, Ruth Ann Skellett
LSU Historical Dissertations and Theses
Prior exposure to moderate-level acoustic stimulation (conditioning) can reduce and/or prevent the deleterious effects of subsequent higher level exposures (Canlon et al., 1988; Campo et al., 1991). Both continuous and interrupted schedules of moderate-level noise have been used as conditioning exposures, and both schedules have been effective in providing protection against subsequent noise trauma. However, there is evidence to suggest that continuous noise exposures are more damaging to the cochlea than interrupted exposures of equal acoustic energy (Bohne et al., 1985, 1987), and moderate-level continuous and interrupted noise exposures differ in the pattern of auditory sensitivity change that they produce …
Extraction And Analysis Of Triazines In Fish Tissues Following A Toxic Exposure: Environmental Factors Affecting Atrazine Toxicity In Fish., Patricia Simmons Gaunt
Extraction And Analysis Of Triazines In Fish Tissues Following A Toxic Exposure: Environmental Factors Affecting Atrazine Toxicity In Fish., Patricia Simmons Gaunt
LSU Historical Dissertations and Theses
Rapid, generic, and environmentally friendly methods for extraction and detection of the pesticides atrazine, cyanazine, metribuzin, and simazine were developed for use in monitoring the cause of pesticide related or suspect fish kills. Further, environmental hypoxia and elevated temperature were studied as possible contributors to the toxicity of atrazine in channel catfish (Ictalurus punctatus) and as synergistic factors to be considered in investigating fish kill events. Incurred residues from the exposure of catfish to atrazine alone or hypoxia or elevated temperature and atrazine were also analyzed. A commercial enzyme-linked immunoassay (ELISA) was utilized as a screening method for the presence …