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Articles 1861 - 1890 of 2496
Full-Text Articles in Life Sciences
Louisiana Agriculture Fall, 2004, Lsu Agcenter
Louisiana Agriculture Fall, 2004, Lsu Agcenter
Louisiana Agriculture
No abstract provided.
Weight History, Perception Of Body Size, And Self-Rated Physical And Mental Health In Black Female Food Stamp Recipients Living In Southeast Louisiana, Catharine Grace Wolfe
Weight History, Perception Of Body Size, And Self-Rated Physical And Mental Health In Black Female Food Stamp Recipients Living In Southeast Louisiana, Catharine Grace Wolfe
Honors Capstones
No abstract provided.
Louisiana Agriculture Summer, 2004, Lsu Agcenter
Louisiana Agriculture Summer, 2004, Lsu Agcenter
Louisiana Agriculture
No abstract provided.
Isolation And Characterization Of T-Dna Insertional Mutations In Arabidopsis Thaliana And Its Use In Determining Siamese, Taylor S. Gwin
Isolation And Characterization Of T-Dna Insertional Mutations In Arabidopsis Thaliana And Its Use In Determining Siamese, Taylor S. Gwin
Honors Capstones
No abstract provided.
The Effects Of Resistant Starch And Fructooligosaccharides On Mineral Absorption In Rats, Katherine Ann Nolen
The Effects Of Resistant Starch And Fructooligosaccharides On Mineral Absorption In Rats, Katherine Ann Nolen
Honors Capstones
No abstract provided.
Louisiana Agriculture Spring, 2004, Lsu Agcenter
Louisiana Agriculture Spring, 2004, Lsu Agcenter
Louisiana Agriculture
No abstract provided.
Louisiana Agriculture Winter, 2004, Lsu Agcenter
Louisiana Agriculture Winter, 2004, Lsu Agcenter
Louisiana Agriculture
No abstract provided.
The Potential Impact Of Trade Policy Changes On Caribbean Sugar, Delroy Anthony Armstrong
The Potential Impact Of Trade Policy Changes On Caribbean Sugar, Delroy Anthony Armstrong
LSU Master's Theses
This study of the Caribbean Sugar Industry summarizes its sugar trading activities and evaluates the potential impact of changes in preferential trading arrangements with the European Union (EU) on the six countries that makes up the Sugar Association of the Caribbean, namely: Jamaica, Barbados, Belize, Guyana, St. Kitts-Nevis, and Trinidad & Tobago. The trading policies that govern sugar trade between these countries and developed countries such as the EU, the United States of America (US) and to a limited extent trade among them is discussed. The report briefly describes how the Caribbean sugar industry is organized, including supply and demand …
Effects Of Dietary Protein Level And Fish Meal On Growth And Hormonal Status Of Weaned Dairy Calves, Patricia Terrell Richardel
Effects Of Dietary Protein Level And Fish Meal On Growth And Hormonal Status Of Weaned Dairy Calves, Patricia Terrell Richardel
LSU Master's Theses
Eight weaned Holstein steers approximately 4 mo of age (mean BW = 119.47 ± 2.65 kg) were used in a replicated 4 x 4 Latin square designed experiment to study the effects of protein source and level on performance and anabolic hormonal status of weaned dairy calves. Treatments consisted of two diets containing either 16 or 20 % crude protein (CP) with or without fish meal (FM). Experimental diets were corn silage based with soybean meal (SBM) as the source of ruminal degradable protein and FM as the source of ruminal undegradable protein. The animals were fed their respective diets …
Identification Of Bacterial Pathogens Causing Panicle Blight Of Rice In Louisiana, Xianglong Yuan
Identification Of Bacterial Pathogens Causing Panicle Blight Of Rice In Louisiana, Xianglong Yuan
LSU Master's Theses
Four hundred and two bacterial isolates isolated on the semi-specific S-PG medium from diseased rice tissues showing symptoms of panicle blighting. These isolates were purified using serial dilution in sterile water and replating on S-PG medium. A total of 420 single isolates were obtained. These isolates were subjected to pathogenicity tests on rice (Oryza sative L. cv. Cypress). Based on these tests, 339 isolates were used in BiologTM tests and identified to the species level. Bacterial strains from 39 species in 16 genera were identified, including 52 isolates representing15 Pseudomonas species and 261 isolates representing six Burkholderia species. The remaining …
The Effect Of Holding Bovine Oocytes In Follicular Fluid On Subsequent Fertilization And Embryonic Development, Angela Marie Klumpp
The Effect Of Holding Bovine Oocytes In Follicular Fluid On Subsequent Fertilization And Embryonic Development, Angela Marie Klumpp
LSU Master's Theses
The objective of Experiment 1 was to determine the effect of bovine follicular fluid (bFF) on nuclear maturation. Treatment A (Control) oocytes were stained with Hoechst-33342 immediately after aspiration from follicles, whereas, oocytes in Treatment B were held in bFF for 12 hours at 38¢ªC and then stained to determine nuclear status. No significant difference was detected between treatment groups. Results indicate that bFF inhibits resumption of meiosis. The objective of Experiment 2 was to determine the effect of bFF on embryonic development. Oocytes in Treatment A (Control) were placed into in vitro maturation (IVM) for 22 hours followed by …
Brachial Artery Dimensions, Flow-Mediated Reactivity And Physical Function In Older Adults, Christina M. King
Brachial Artery Dimensions, Flow-Mediated Reactivity And Physical Function In Older Adults, Christina M. King
LSU Master's Theses
Human aging is associated with deterioration in physical functional ability. The causes are complex and multifactorial, but are presumed to include the presence and extent of cardiovascular disease. Purpose: To examine the associations between brachial artery (BA) dimensions, flow-mediated dilation (BAFMD) and physical function in 28 older adults (age: 84.6±10.9, range 66 to 98 yrs). Methods: High-resolution ultrasonography was used to measure BA diameters at rest and following 5min of forearm occlusion. Physical function was assessed using the Continuous Scale-Physical Function Performance (CS-PFP) test. Results: Pearson correlation revealed that BAFMD (r =-.39), and all physical function parameters of the CS-PFP …
Cryopreservation Of Bovine And Caprine Oocytes By Vitrification, Sabrina Marie Luster
Cryopreservation Of Bovine And Caprine Oocytes By Vitrification, Sabrina Marie Luster
LSU Master's Theses
Cryopreservation of animal oocytes will permit germplasm of valuable or unique females to be preserved for extended times. The objective of this research was to derive a procedure to cryopreserve bovine oocytes by vitrification to be used as recipients for somatic cell nuclear transfer (SCNT). Caprine oocytes vitrified by the same procedure were assayed by cytological examination of microtubules. In the first two of three experiments, bovine oocytes matured in vitro were vitrified in a mixture of ethylene glycol (EG), dimethylsulfoxide (Me2SO) and trehalose, and then subjected to in vitro fertilization (IVF) or SCNT. For vitrification, oocytes were first exposed …
Species Diversity And Biogeography Of Ants (Hymenoptera: Formicidae) In Louisiana With Notes On Their Ecology, Shawn T. Dash
Species Diversity And Biogeography Of Ants (Hymenoptera: Formicidae) In Louisiana With Notes On Their Ecology, Shawn T. Dash
LSU Master's Theses
Over three decades have passed since the completion of Moser and Blum's (1960) treatment of the ants of Louisiana. This research represents a significant contribution to and update of their work. I report the first-ever comprehensive assessment of the Louisiana Formicid fauna. More than 100 species from 38 genera and eight subfamilies are covered. This faunistic survey gives valuable data of biodiversity and macro/microhabitat selection of ant species. Included are keys to all subfamilies, genera, and species with illustrations photographs, and a regional map for each species.
Insect Pest Management Approaches Among Currently Recommended Sugarcane Varieties In Louisiana, Frederick R. Posey
Insect Pest Management Approaches Among Currently Recommended Sugarcane Varieties In Louisiana, Frederick R. Posey
LSU Master's Theses
The sugarcane borer, Diatraea saccharalis (F.), (Lepidoptera: Crambidae), is responsible for more than 90% of the total insect damage to sugarcane in Louisiana. The decision to apply insecticides is complex and influenced by numerous variables. Included among these variables are insect infestation levels, varieties, weather conditions, production input levels, and environmental concerns. Predicting damage that may result from infestations occurring at a particular time of the crop production season is also important. The objective of this research was to evaluate the impact of these variables on sugarcane borer populations and subsequent yield loss. Results from a two-year survey indicated a …
Abiotic And Biotic Factors Affecting The Distribution Of Solenopsis Invicta Buren, Brachymyrmex Sp., And Linepithema Humile (Mayr) In East Baton Rouge Parish, Louisiana, Jessica Lynn Rosson
Abiotic And Biotic Factors Affecting The Distribution Of Solenopsis Invicta Buren, Brachymyrmex Sp., And Linepithema Humile (Mayr) In East Baton Rouge Parish, Louisiana, Jessica Lynn Rosson
LSU Master's Theses
Ant populations and their distribution are affected by many circumstances. Abiotic factors such as weather, water availability, and soil characteristics may determine if a habitat is suitable for ants. Other factors such as level of disturbance, available food resources, reproductive biology, and natural enemies also contribute to defining ant distribution. Three ant species in East Baton Rouge parish, Louisiana were studied to determine what factors affected their distribution by measuring abiotic and biotic factors at sampling sites throughout the parish. These factors included weather, water availability, vegetation types, level of disturbance, and soil characteristics. Factors which predict abundance of Solenopsis …
Development Of Chicken Polyclonal And Mouse Monoclonal-Based Enyzyme Immunoassays For The Detection Of Β-Cyclocitral In Catfish Pond Water, Cate Nakaweesa Munene
Development Of Chicken Polyclonal And Mouse Monoclonal-Based Enyzyme Immunoassays For The Detection Of Β-Cyclocitral In Catfish Pond Water, Cate Nakaweesa Munene
LSU Doctoral Dissertations
The Catfish industry faces a problem of off-flavors due to odorous compounds produced by cyanobacteria and blue-green algae. Beta-Cyclocitral imparts a hay-woody odor to pond water and fish tissues. At present there are no reliable pond treatment methods available to control these off-flavors. To monitor the levels of this compound for quality control, rapid, sensitive and inexpensive methods are needed. The major goal of this study was to develop enzyme-linked immunoflow assays based on monoclonal and polyclonal antibodies that are specific and sensitive enough to detect beta-cyclocitral in catfish pond water. Beta-Cyclocitral-PPD conjugate was prepared and used to immunize two …
Leptin In Horses: Influences Of Body Condition, Gender, Insulin Insensitivity, Feeding, And Dexamethasone, Joshua Allen Cartmill
Leptin In Horses: Influences Of Body Condition, Gender, Insulin Insensitivity, Feeding, And Dexamethasone, Joshua Allen Cartmill
LSU Doctoral Dissertations
The experiments described herein were designed to answer questions that arose from initially attempting to determine whether treatment with dexamethasone increased concentrations of leptin in geldings. Dexamethasone treatment did in fact increase leptin concentrations in mares, geldings, and stallions. Additional experiments were designed to determine leptin's interaction, not only with the adrenal axis, but with the thyroid axis, the growth hormone/insulin-like growth factor-1 axis, as well as glucose and insulin metabolism in geldings, mares, and stallions. During the course of these experiments, differences in leptin concentrations in the horse were attributed to degree of body condition, gender, and feeding time. …
Integration Of Management Tactics For The Rice Water Weevil Lissorhoptrus Oryzophilus Kuschel With Particular Emphasis On Use Of Plant Resistance (Tolerance), Li Zou
LSU Doctoral Dissertations
Studies were conducted to test the hypothesis, significant benefits can be achieved for the management of rice water weevil, Lissorhoptrus oryzophilus Kuschel, by the use of rice varieties with low levels of host plant resistance coupled with the judicious use of cultural practices and insecticides. Tolerant traits of a current commercial variety of rice, "Bengal", was manifested consistently over multiple years. Study on rice growth as effected by weevil injury showed that pruning of root systems by larvae of weevil resulted in a decrease in tiller number and shoot biomass of rice plants in the vegetative stage of growth. Yield …
Somatic Cell Interspecies Nuclear Transfer, Marina Julia Sansinena
Somatic Cell Interspecies Nuclear Transfer, Marina Julia Sansinena
LSU Doctoral Dissertations
The low efficiency of the nuclear transfer (NT) procedure requires large number of oocytes to produce embryos and live offspring. A series of experiments were conducted to evaluate the ability of the bovine cytoplast to reprogram nuclei from horses and llamas. In a preliminary study, equine oocytes from small (<20mm diameter) follicles were either pretreated with roscovitine or placed in maturation (IVM only) prior to NT. Roscovitine pretreatment did not improve nuclear maturation rates (roscovitine pretreatment 57% vs. IVM only 66%) and no fusion was obtained from roscovitine-pretreated oocytes after NT. Another preliminary study was conducted with the objective to produce llama NT embryos and to compare their development in two in vitro culture conditions (G1.2® vs. CR1aa). No difference was found in the number of embryos cleaved after 2 d of culture. This resulted in the first scientific report of somatic cell NT, in vitro culture and transfer of NT embryos in the llama. In the next experiment, adult horse and llama fibroblasts were injected into enucleated cow oocytes. The results showed the cow cytoplasm is capable of partially reprogramming nuclei from other species and support mitotic divisions. However, this study also showed a consistent embryonic developmental arrest at the 8- to 16- cell stage when horse or llama donor cells were used as donor nuclei. When a more closely related species of donor cell (banteng) and recipient oocyte (domestic cattle) were used for NT, no embryonic developmental arrest was found. Embryos progressed to achieve high blastocyst rates (banteng male cell line 28% vs. banteng female cell line 15%). Two banteng interspecies NT pregnancies were established and subsequently lost from the banteng male cell line. In the final study, the effect of a mixed mitochondrial population (heteroplasmy) on early embryonic development was investigated. Ooplasmic transfer performed in combination with NT procedure indicated presence of foreign mitochondria clustered in a small portion of the cytoplasm in early stages of embryo development. When goat ooplasm was transferred into interspecies (cow oocyte-goat donor cell) NT embryos, fusion and cleave rates were reduced suggesting an increased level of heteroplasmy or nuclear-ooplasmic incompatibilities.
The Chick Embryo Amnion As An In Vitro Culture System For Ivf And Nt Embryos, Tonya Renea Davidson
The Chick Embryo Amnion As An In Vitro Culture System For Ivf And Nt Embryos, Tonya Renea Davidson
LSU Doctoral Dissertations
Calving rates are significantly reduced following in vitro production of embryos. Thus, if a technique could be developed that would increase calving rates by as little as one viable offspring, significant research advances could be made. Therefore, in a series of experiments, the efficiency and quality of culturing IVP bovine embryos in the amnion of a domestic chicken egg was tested. In Experiment I, by culturing IVP bovine embryos in the chick amnion (day 4 to 7 of incubation) it was discovered that there was no significant difference in blastocyst rates compared with controls. In Experiment II, it was shown …
Faunal Succession Of Necrophilous Insects Associated With High-Pofile Wildlife Carcasses In Louisiana, Erin Jean Grindley Watson
Faunal Succession Of Necrophilous Insects Associated With High-Pofile Wildlife Carcasses In Louisiana, Erin Jean Grindley Watson
LSU Doctoral Dissertations
The same entomological criteria used in estimating time of death for humans are applicable for deceased wildlife. Necrophilous insects associated with animal carcasses can provide wildlife law enforcement with valuable information necessary for postmortem interval estimation, and ultimately, to incriminate poachers. The purpose of this research was twofold: to establish species composition, faunal succession patterns, and species and life stage interactions of necrophilous insects associated with three wildlife species; and to identify new methods of evaluating succession patterns using statistical measures. Twenty-one large vertebrate carcasses were monitored throughout decomposition in a mixed flatwood forest in East Baton Rouge Parish, LA …
Spatial Econometric Analysis Of Louisiana Rural Real Estate Values, Patricia Soto
Spatial Econometric Analysis Of Louisiana Rural Real Estate Values, Patricia Soto
LSU Doctoral Dissertations
The general purpose of this study was to conduct a spatial analysis of the dynamics of rural land values in Louisiana. Specifically, spatial econometric procedures and hedonic price analysis were used to evaluate the impact of land characteristics on land prices across rural land markets in Louisiana. Initially, hedonic models were estimated by ordinary least squares (OLS) procedures to test for the presence of spatial autocorrelation using Lagrange Multiplier tests. Results suggested that there was spatial autocorrelation in the error terms. Hedonic models were then estimated using maximum likelihood (ML) spatial error techniques. Log likelihood numbers and likelihood ratio tests …
Examining The Relationships Between Ability Conceptions, Intrinsic Motivation, Presistence And Performance, Weidong Li
Examining The Relationships Between Ability Conceptions, Intrinsic Motivation, Presistence And Performance, Weidong Li
LSU Doctoral Dissertations
The purpose of this study was to examine the relationships between ability conceptions, intrinsic motivation, persistence, and performance using an interaction approach. The phase-one study revealed that participants who were more oriented toward incremental ability beliefs were likely to be more intrinsically motivated. For those who were more intrinsically motivated, they displayed more persistence and obtained better performance scores. Participants who were highly intrinsically motivated had lower performance scores as they were more oriented toward incremental ability beliefs. The phase-two study showed that participants who were more oriented toward incremental views were more intrinsically motivated, which provided evidence supporting the …
Hemodynamic Responses Following Dynamic Resistance Exercise In Young And Older Adult Women, Rafael Antonio Reyes
Hemodynamic Responses Following Dynamic Resistance Exercise In Young And Older Adult Women, Rafael Antonio Reyes
LSU Doctoral Dissertations
This investigation examined the effects of age, exercise and test condition on hemodynamic variables, autonomic and vascular function in relation to resistance exercise (RE). The associations among these variables were also examined. METHODS: Sixteen young (21.4+1.4 yrs) and 16 older (69.7+3.9 yrs) women performed 5- and 15- repetition maximal (RM) of knee extension RE. Continuous blood pressure (BP) and electrocardiography (ECG) data were recorded. The dependent variables are reported at pre-exercise, peak exercise and recovery period. Heart rate variability data were derived from 5- and 10-min segments before and after exercise. Resting and after arterial occlusion forearm vascular function indices …
The Non-Phosphorus Effects Of Dietary Phytase In Swine And Poultry, Jason Layne Shelton
The Non-Phosphorus Effects Of Dietary Phytase In Swine And Poultry, Jason Layne Shelton
LSU Doctoral Dissertations
This research was conducted to determine the non-phosphorus effects of phytase in diets for swine and poultry. An experiment was conducted to determine the effect of phytase addition on energy availability and protein and fat deposition in growing pigs. Results from this experiment indicated that phytase had small positive effects on energy availability, protein deposition, and fat deposition. In this study, 23 of 29 response variables were at least numerically increased with phytase addition. Two experiments were conducted to determine the accuracy of the energy and amino acid matrix values for Natuphos 1200 in broilers from 0 to 21 or …
Investigation Of Insect-Weed Interactions In The Rice Agroecosystem, Kelly V. Tindall
Investigation Of Insect-Weed Interactions In The Rice Agroecosystem, Kelly V. Tindall
LSU Doctoral Dissertations
Interactions between graminaceous weed and insect pests of rice and between management practices for these pests were investigated. Studies were conducted to examine preference and performance of rice water weevil, Lissorhoptrus oryzophilus Kuschel, on several weeds commonly found in rice fields. Several weeds were more preferred than rice, and larvae were present on several dicotyledonous weeds, suggesting the host range of L. oryzophilus is broader than previously thought. Effects of the presence of barnyardgrass, (Echinochloa crus-galli Beauv.), on rice stink bugs, Oebalus pugnax F., and L. oryzophilus populations in rice fields were investigated. Presence of barnyardgrass and the synchrony …
The Effects Of Inorganic And Organic Selenium Sources On Growth Performance, Carcass Traits, Tissue Mineral Concentrations, And Enzyme Activity In Poultry, Robert L, Iii Payne
The Effects Of Inorganic And Organic Selenium Sources On Growth Performance, Carcass Traits, Tissue Mineral Concentrations, And Enzyme Activity In Poultry, Robert L, Iii Payne
LSU Doctoral Dissertations
The purpose of this research was to compare dietary inorganic and organic Se sources in poultry. An experiment was conducted to assess daily egg production and Se deposition in eggs of hens fed diets supplemented with inorganic or organic Se. The results from this experiment indicated that hen production was not affected by Se source, and organic Se increased egg Se concentrations more than inorganic Se. Two experiments then were conducted with broilers to compare dietary organic and inorganic Se on growth performance, carcass traits, breast and plasma Se concentrations, and plasma glutathione peroxidase activity. The results from these experiments …
Interactions Of Insect Herbivory And Multiple Abiotic Stress Agents On Two Wetland Tree Species In Southeast Louisiana Swamps, Rebecca Faye Souther-Effler
Interactions Of Insect Herbivory And Multiple Abiotic Stress Agents On Two Wetland Tree Species In Southeast Louisiana Swamps, Rebecca Faye Souther-Effler
LSU Doctoral Dissertations
Forested wetlands in Louisiana are hydrologically isolated from the Mississippi River, impounded by manmade structures, impacted by saltwater intrusion, and are sinking, resulting in more frequent flooding for longer periods. Additionally, defoliation of the two dominant trees, baldcypress (Taxodium distichum L. Rich) and water tupelo (Nyssa aquatica L.), occur frequently during spring. In Louisiana, the baldcypress leafroller, BCLR, (Archips goyerana Kruse) and the forest tent caterpillar, FTC, (Malacosoma disstria Hubner) defoliate up to 120,000ha of baldcypress-tupelo swamps. Restoration plans call for reintroducing Mississippi River water (diversions) to increase sediment elevation, promote natural regeneration, and enhance primary and secondary productivity. In …
Evaluating International Agricultural Trade In Central America: Three Analyses, Jose Roberto Andino
Evaluating International Agricultural Trade In Central America: Three Analyses, Jose Roberto Andino
LSU Doctoral Dissertations
A case study framework was used to study the competitiveness of Honduran coffee with major importing partners, along with an import demand analysis. Several important points summarize the findings. First, trends in green coffee supply and consumption continue to depress world coffee prices, making the production of coffee less attractive. Since small coffee producing countries, like Honduras, cannot affect the international price, they must improve efficiency, productivity, employ cost reduction techniques, and rely on the promotion of specific product attributes to remain competitive. Second, increased market share of Honduran coffee in major importing markets, Germany, Japan, and the U.S. was …