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2004

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The Use Of Altrenogest To Control Reproductive Function In Beef Cattle, Clarence Edward Ferguson Jan 2004

The Use Of Altrenogest To Control Reproductive Function In Beef Cattle, Clarence Edward Ferguson

LSU Doctoral Dissertations

There has been great controversy involving progesterone (P4) levels during early pregnancy in cattle. The objectives of these experiments were to determine the effect of an early low dose administration of P4 or altrenogest (ALT) on pregnancy rates in repeat breeder (RPB) females, if an increase in pregnancy rates could result from a direct effect of P4 on the embryo and if ALT could support pregnancy in the absence of a functional CL. Firstly, ALT was evaluated for use as a progestin in cattle by synchronizing estrus in beef heifers. There were no differences in the …

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Synthesis, Characterization And Study Of Novel Reagents For The Detection Of Saccharides And Amino Acids, Nadia Nadette St. Luce Jan 2004

Synthesis, Characterization And Study Of Novel Reagents For The Detection Of Saccharides And Amino Acids, Nadia Nadette St. Luce

LSU Doctoral Dissertations

The design of synthetic receptors for the recognition and sensing of saccharides and amino acids is currently a major challenge. This is due to inherent structural similarity and a lack of chromophoric or fluorophoric properties of these compounds. The synthesis and study of novel detection agents for bioactive molecules as well as mechanistic studies are presented herein. The elucidation of the mechanism by which tetraarylboronic acid resorcinarene interact with sugar molecules and promote a solution color change is explored. This vast collaborative study, reveals that DMSO solutions of boronic acid functionalized resorcinarene macrocycles afford visual color changes upon heating or …

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Photo-Control Of Dna Oligonucleotides With Cage Compounds, Bilal Ghosn Jan 2004

Photo-Control Of Dna Oligonucleotides With Cage Compounds, Bilal Ghosn

LSU Master's Theses

Many biochemical processes in which DNA and other nucleic acids participate are central to functions in both living cells and in molecular biology assays. While many compounds have been used to regulate the activity of DNA, these strategies are limited to the aqueous-based diffusion of the activator to the target DNA molecule. An improvement to the induction of DNA bioactivity is to move to a light-based modulation. This research demonstrates a light-based technique using a photo-cleavable cage compound to transiently inactivate DNA hybridization. Function can be restored with exposure to near-UV light, allowing for temporal control of DNA oligonucleotide (ODN) …

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An Evaluation Of Reference Evapotranspiration Models In Louisiana, Royce Landon Fontenot Jan 2004

An Evaluation Of Reference Evapotranspiration Models In Louisiana, Royce Landon Fontenot

LSU Master's Theses

Daily and monthly output from seven evapotranspiration models (FAO-24 Radiation, FAO-24 Blaney-Criddle, Hargreaves-Samani, Priestly-Taylor, Makkink, and Turc) have been tested against reference evapotranspiration data computed by the FAO-56 Penman-Monteith model to assess the accuracy of each model in estimating grass-reference evapotranspiration in Louisiana. Models were compared at eight stations of the Louisiana Agriclimate Information System using data from December 2002 to November 2003. Comparisons were also made using three composite regions: statewide, inland, and coastal. A pan evaporation to reference evapotranspiration model (FAO-24 Pan Evaporation) was also tested against daily grass reference evapotranspiration from the FAO-56 Penman-Monteith model using data …

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Spectroscopic Investigation Of Nitrogenase: Epr And Mcd Studies Of The Femo Cofactor And The P-Cluster, Robyn B. Broach Jan 2004

Spectroscopic Investigation Of Nitrogenase: Epr And Mcd Studies Of The Femo Cofactor And The P-Cluster, Robyn B. Broach

LSU Doctoral Dissertations

Little is known about substrate binding and reduction of nitrogenase. EPR spectroscopy is used here to observe intermediate states generated by different substrates. Two different spin states (S=3/2 and S=1/2) were exhibited for each substrate, which may result from different binding of the substrate to the cofactor (side-on or terminal binding) or the difference of the substrate binding to either Fe or Mo of the cofactor. Parallel studies were performed on a variant MoFe protein, alpha-195Gln, which exhibited different signals from the wild-type suggesting that the substituted amino acid maybe necessary to reach some mechanistic states that the …

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The Contributions Of Floyd Leslie Sandle To Black Educational Theatre In Louisiana, Ava Marie Brewster-Turner Jan 2004

The Contributions Of Floyd Leslie Sandle To Black Educational Theatre In Louisiana, Ava Marie Brewster-Turner

LSU Doctoral Dissertations

Floyd Leslie Sandle appeared on the theatrical scene in 1938 on the campus of Grambling State University. From his humble beginnings in the segregated town of Magnolia, Mississippi, to Dillard University where his passion for theatre was nurtured by Dr. Sheppard Randolph Edmonds, Sandle made significant strides in the dvelopment of Black Educational Theatre in Louisiana. Through his unique approach of presenting plays to the residents of the rural community of Grambling, Louisiana, Sandle was able to establish a state certified Speech and Drama Department at Grambling State University. He trained students in educational theatre though his lectures, laboratory experiences, …

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Chromosomal Localization Of A Proinsulin Transgene Inserted With A Transposon-Based Vector Into Japanese Quail, Coturnix Coturnix, Lacey R. Mcnally Jan 2004

Chromosomal Localization Of A Proinsulin Transgene Inserted With A Transposon-Based Vector Into Japanese Quail, Coturnix Coturnix, Lacey R. Mcnally

LSU Doctoral Dissertations

The overall goals of this research were to develop a reproducible method of detecting stable DNA insertion into Japanese quail and provide a method for gene location on avian chromosomes. This research resulted in the development of a different method of obtaining chromosome spreads in Japanese quail, the establishment of primed in situ hybridization as a method for the chromosomal gene detection in birds, development of Teflon-coated coverslip slides to facilitate laser microdissection of 0.5 ƒÝm samples, and chromosomal identification of proinsulin transgene insertions by laser microdissection and nucleotide sequence from G2 Japanese quail. The 28S rDNA was found on …

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Analysis And Evaluation Of A Bioengineered Submerged Breakwater, Matthew Dwain Campbell Jan 2004

Analysis And Evaluation Of A Bioengineered Submerged Breakwater, Matthew Dwain Campbell

LSU Master's Theses

Louisiana's coastline has received national attention due to rapid erosion rates estimated from approximately 60 to 100 square kilometers per year. The disappearance of coastal areas jeopardizes public and private infrastructure, property values, aquatic ecosystems, and standards of living. In order to resolve the erosion problem, innovative solutions have been explored that may improve effectiveness and cost efficiency. This research involves a technology, termed an "oysterbreak," which is a bioengineered submerged breakwater. This structure promotes oysters to form a dense structure that dissipates wave energy. Since the structure is biologically dominated, initial material use is modest. The oysterbreak was evaluated …

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Site-Directed Mutagenesis Studies Of E. Coli Biotin Carboxylase, Valerie Melissa Sloane Jan 2004

Site-Directed Mutagenesis Studies Of E. Coli Biotin Carboxylase, Valerie Melissa Sloane

LSU Doctoral Dissertations

Acetyl-CoA carboxylase is an essential enzyme in all plants, animals, and bacterie, where it catalyzes the committed step in fatty acid synthesis. The Escherichia coli version of the enzyme has three functional components that dissociate readily: biotin carboxylase, carboxyltransferase, and a biotin carboxyl carrier protein. The biotin carboxylase component catalyzes the ATP-dependent carboxylation of biotin, using bicarbonate as the carboxylate source. Biotin carboxylase is a member of a functionally diverse superfamily of proteins known as the ATP-grasp enzymes. In the first study, four residues of biotin carboxylase, Lys 116, Lys 159, His 209, and Glu 276, were selected for site-directed …

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Biological Treatment Of Industrial Wastewater Containing High Concentrations Of Linear Alkylbenzene Sulfonate (Las), Luis Alberto Espinoza Jan 2004

Biological Treatment Of Industrial Wastewater Containing High Concentrations Of Linear Alkylbenzene Sulfonate (Las), Luis Alberto Espinoza

LSU Master's Theses

Lauryl Alkylbenzene Sulfonate (LAS) is the major anionic surfactant used worldwide in detergent and household cleaning product formulations. Its biodegradation and removal has been extensively studied in wastewater treatment facilities and laboratory-scale tests at low concentrations (<10 mg/L) typical of those encountered in municipal wastewater treatment plants. Less effort, however, has been expended investigating degradation of higher concentrations of LAS representative of those expected in wastewater generated at LAS manufacturing operations. The research described in this thesis was conducted to study biological processes for treating wastewaters containing high concentrations (e.g., 400 mg/L) of LAS. Initial experiments were carried out using a respirometry technique, and subsequently, three different laboratory-scale bioreactor systems. The three systems studied were a Sequencing Batch Reactor (SBR), a Sequencing Batch Biofilm Reactor (SBBR), and an Intermittent Cycle Extension Aeration System (ICEAS). The SBR and ICEAS were operated on a five-day cycle basis with a hydraulic retention time of four days. The SBBR was operated mainly in a two-day cycle having a hydraulic retention time of ten days as well, and polyurethane foam cubes were used as a support medium for attached biomass growth. The three systems were compared on their ability to remove LAS measured in terms of total organic carbon (TOC) and methylene blue active substances (MBAS). The reactors were also compared on the basis of foam production. The ICEAS showed the best performance in terms of controllable foam production while exhibiting a capacity for effectively dealing with transient periods of elevated loading. When a short Fill period was used, the SBR and SBBR had the disadvantage of producing excessive foaming, and an intermittent aeration strategy was required avoid overflow.

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Students' Construction Of The Body In Physical Education, Laura Azzarito Jan 2004

Students' Construction Of The Body In Physical Education, Laura Azzarito

LSU Doctoral Dissertations

Recently, physical education researchers have been concerned about the results of national studies reporting young people's low level of participation in physical activity and health problems associated with inactivity. In general girls are less active than boys, and youth from low socioeconomic classes are less active and are more likely be unhealthy than middle or upper class youth. Blacks have the highest risks of health problems and the highest levels of physical inactivity. Among a number of recommendations included in Healthy People 2010, physical education has been identified as a fundamental site for addressing today's challenges. According to physical education …

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Spatial Analyses And Growth Of Trees In Selected Bottomland Hardwood Stands, Luben D. Dimov Jan 2004

Spatial Analyses And Growth Of Trees In Selected Bottomland Hardwood Stands, Luben D. Dimov

LSU Doctoral Dissertations

Sustainable management and conservation of the extensive bottomland hardwood forest resource in the southeastern U.S. requires a good understanding of basic structural and competitive relationships within these forests. To gain an insight into these relationships, plot information from stands in Arkansas, Louisiana, and Mississippi were analyzed. The effects of individual tree attributes, distance-dependant, and distance-independent competition measures on 5-yr radial growth of red oak crop trees were examined. Selected species included cherrybark oak (Quercus pagoda Raf.), water oak (Q. nigra L.), and Nuttall oak (Q. nuttallii Palmer). Spatial continuity of tree variables was explored through geostatistical analysis. Finally, spatial distribution …

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The Influence Of State Merit-Based Aid On Access And Educational Experiences: An Exploration Of The Louisiana Tuition Opportunity Program For Students (Tops), Roderick L. Smothers Jan 2004

The Influence Of State Merit-Based Aid On Access And Educational Experiences: An Exploration Of The Louisiana Tuition Opportunity Program For Students (Tops), Roderick L. Smothers

LSU Doctoral Dissertations

Access to higher education at the beginning of the new millennium faces unprecedented challenges. Although many of those challenges have been identified and addressed through research and federal and state policies, there still exists an inherent gap in the current and potential future success of today’s college students. This is particularly true for minority and lower-income students. Some of the identified challenges include: lack of financial assistance, persisting through and graduating from college, pre-college preparation, socioeconomic status, and family support/motivation. This study focuses primarily on the financial barriers that impede the process of providing equal access to all students, which …

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Protein Aggregation Studies: Inhibiting And Encouraging Β-Amyloid Aggregation, Jed Paul Aucoin Jan 2004

Protein Aggregation Studies: Inhibiting And Encouraging Β-Amyloid Aggregation, Jed Paul Aucoin

LSU Doctoral Dissertations

This work demonstrates peptide-based aggregation mediation of fibril forming peptides, notably β-amyloid (1-40), Aβ1-40. To achieve the goals of this work, Aβ1-40 aggregation was governed by ionic strength, temperature, and pH. After controlling and reproducing Aβ1-40 aggregate formation (fibrils), each peptide-based aggregation mediator was evaluated for its ability to self-aggregate and to possess surface-active properties. The incorporation of these mediators in Aβ1-40 solutions changed the surface tension and produced aggregate complexes of mediator and Aβ1-40. Evidence that Aβ1-40 fibril formation may be mediated by disorder-to-order transitions has been observed by layer formation …

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Genetics And Functions Of Herpes Simplex Virus Type 1 Membrane Proteins In Virus-Induced Cell Fusion, Virion Morphogenesis And Egress, Jeffrey Michael Melancon Jan 2004

Genetics And Functions Of Herpes Simplex Virus Type 1 Membrane Proteins In Virus-Induced Cell Fusion, Virion Morphogenesis And Egress, Jeffrey Michael Melancon

LSU Doctoral Dissertations

The Herpes Simplex Virus life cycle contains a number of membrane fusion events that must function properly to ensure a productive infection, including: virus attachment and entry into susceptible cells, de-envelopment at the outer nuclear lamellae, and virus-induced cell-to-cell fusion. A virus-free cell fusion assay was recently developed in order to attempt to understand the underlying mechanisms that are responsible for viral fusion events and was utilized in order to investigate the effect of mutations targeted to the carboxyl terminus of gB. We showed that the predicted alpha helical domain H17b within the carboxyl-terminus of gB is involved in both …

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Numerical And Experimental Investigation Of Transport Processes In Biological Systems, Yimeng He Jan 2004

Numerical And Experimental Investigation Of Transport Processes In Biological Systems, Yimeng He

LSU Master's Theses

This thesis focuses on optimization techniques for transport process during the cryopreservation of biological systems. In the first part of this thesis, a well established shape independent Differential Scanning Calorimeter (DSC) technique was used to measure the dehydration response during freezing of Pacific oyster sperm cells. Volumetric shrinkage during freezing of diploid and tetraploid pacific oyster sperm cell suspensions was obtained at cooling rates of 5 and 20 ˚C/min in the presence of extracellular ice and CPAs. By fitting a model of water transport to the experimentally obtained volumetric shrinkage data the best fit membrane permeability parameters (Lpg and …

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Thermodynamic Characterization Of Dna Binding By Type I Dna Polymerases From Thermus Aquaticus And Escherichia Coli, Kausiki Datta Jan 2004

Thermodynamic Characterization Of Dna Binding By Type I Dna Polymerases From Thermus Aquaticus And Escherichia Coli, Kausiki Datta

LSU Doctoral Dissertations

DNA binding of the DNA polymerase I from Thermus aquaticus (Taq and Klentaq fragment) and E. coli (Klenow fragment) have been studied as a function of [salt] and temperature in order to understand their DNA binding thermodynamics. Binding of the two different species of polymerases occurs with sub-micromolar affinities in very different salt concentration ranges. Thus, at similar [KCl] the binding of Klenow is ~ 3kcal/mol (150X) tighter than the binding of Taq/Klentaq. Linkage analysis of the [KCl] dependence of DNA binding at 25°C reveals a net release of 2-3 ions for Taq/Klentaq and 4-5 ions for Klenow. DNA binding …

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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 Jan 2004

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 …

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Quality Evaluation Of Cheddar Cheese Containing Gamma-Oryzanol, Miguel Ángel Gutiérrez Jan 2004

Quality Evaluation Of Cheddar Cheese Containing Gamma-Oryzanol, Miguel Ángel Gutiérrez

LSU Master's Theses

Health benefits from consuming rice bran oil (RBO) have been extensively studied in humans. RBO has been shown to decrease cholesterol absorption by inhibiting the oxidation of the LDL-cholesterol. Gamma-Oryzanol is one of the RBO components that possess antioxidative properties; it is a polyphenolic compound resembling tocopherol (vitamin E), which is another component of RBO. There are evidences that oryzanol has potential applications for enhancing shelf-life of foods containing fats processed at a high temperature, decreasing the total cholesterol, LDL-cholesterol and triglyceride levels in plasma lipids, and healing ulcers. In order to take advantage of the health benefits of oryzanol, …

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Evaluation Of Growth, Production And Cold Tolerance Of Four Varieties Of Tilapia, Patricio Enrique Paz Jan 2004

Evaluation Of Growth, Production And Cold Tolerance Of Four Varieties Of Tilapia, Patricio Enrique Paz

LSU Master's Theses

As global tilapia production grows, it is important to characterize varieties available for production and generate data on environmental tolerances. This study generated data on tolerances, adaptabilities and production characteristics of four tilapia varieties. Goals of this study were to: (1) compare growth of four tilapia varieties in two types of recirculating systems, (2) evaluate juvenile growth of seven tilapia varieties in fresh and brackishwater mesocosms, and (3) estimate cold tolerance of juveniles of four tilapia varieties in fresh and brackishwater. Nile tilapia (Oreochromis niloticus), blue tilapia (Oreochromis aureus), Mississippi commercial strain tilapia (MCS), and Florida red tilapia (FRT) were …

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Effects Of Dietary Protein Level And Fish Meal On Growth And Hormonal Status Of Weaned Dairy Calves, Patricia Terrell Richardel Jan 2004

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 …

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Estimation Of Living Body Weight Based On Measurements Of Anterior Superior Iliac Spine Breadth And Stature, Jaime A. Suskewicz Jan 2004

Estimation Of Living Body Weight Based On Measurements Of Anterior Superior Iliac Spine Breadth And Stature, Jaime A. Suskewicz

LSU Master's Theses

Standard identification criteria for creating a decedent’s biological profile typically include ancestry, sex, age, and stature, but not body weight. Body weight information may not only assist in creating a more complete biological profile but may also provide insight into other forensic considerations, such as taphonomy and body transport and disposal. The current study seeks to establish multiple regression equations for the prediction of living body weight in skeletal remains. Specifically, the measurements of anterior superior iliac spine (ASIS) breadth and stature are assessed with regard to living weight. Research was carried out on both a skeletal sample and a …

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On The Cranial Anatomy Of The Polycotylid Plesiosaurs, Including New Material Of Polycotylus Latipinnis, Cope, From Alabama, F. Robin O’Keefe Jan 2004

On The Cranial Anatomy Of The Polycotylid Plesiosaurs, Including New Material Of Polycotylus Latipinnis, Cope, From Alabama, F. Robin O’Keefe

Biological Sciences Faculty Research

The cranial anatomy of plesiosaurs in the family Polycotylidae (Reptilia: Sauropterygia) has received renewed attention recently because various skull characters are thought to indicate plesiosauroid, rather than pliosauroid, affinities for this family. New data on the cranial anatomy of polycotylid plesiosaurs is presented, and is shown to compare closely to the structure of cryptocleidoid plesiosaurs. The morphology of known polycotylid taxa is reported and discussed, and a preliminary phylogenetic analysis is used to establish ingroup relationships of the Cryptocleidoidea. This study also presents new material referable to Polycotylus latipinnis from the Mooreville Chalk Formation of Alabama. This skeleton is largely …

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Temperature Effects On Spawning And Fingerling Production Of Channel Catfish Ictalurus Punctatus, Patrice Arnold Pawiroredjo Jan 2004

Temperature Effects On Spawning And Fingerling Production Of Channel Catfish Ictalurus Punctatus, Patrice Arnold Pawiroredjo

LSU Master's Theses

The goal of this study was to develop several techniques that utilize the use of geothermal water that can contribute to increased profitability for commercial catfish producers. The primary objectives of this study were to: 1) determine the heating requirement using degree-days of channel catfish spawning 2) improve the efficiency of artificial spawning and, 3) evaluate the effectiveness of stocking outdoor ponds and pools with channel catfish fry. The heating requirement for channel catfish spawning was determined to be between 99 and 129 degree days at the peak of spawning. There was no difference in degree-day values between spawns collected …

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Applying The Transtheoretical Model To Promote Greater Fruit And Vegetable Consumption: A Successful Approach To Maintaining Behavioral Change, Hiba Ahmad Bawadi Jan 2004

Applying The Transtheoretical Model To Promote Greater Fruit And Vegetable Consumption: A Successful Approach To Maintaining Behavioral Change, Hiba Ahmad Bawadi

LSU Doctoral Dissertations

The purpose of this study was to investigate the response of participants in the first three Stages of Change (SOC) to a preparation stage-tailored intervention to increase fruit and vegetable (F&V) consumption. An on-line survey was delivered to 400 university employees, and included questionnaires about their demographic information, SOC, self efficacy (SE), and decisional balance (DB). One hundred fifty six (39%) responded to the survey. A total of 40 were selected from the first three stages, precontemplation (PC), contemplation (C), and preparation (P), and were assigned into two groups (PC/C and P) with consideration to the best possible matching in …

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Bees Associated With Louisiana Longleaf Pine Savannas, Chanda Sara Bartholomew Jan 2004

Bees Associated With Louisiana Longleaf Pine Savannas, Chanda Sara Bartholomew

LSU Master's Theses

Longleaf pine savannas are perhaps the most threatened ecosystems in North America. Despite a well documented and highly diverse flora, little has been published on insects in general and, in particular, on bees that provide the valuable service of plant pollination. Thus, the aims of this study were to: 1) survey bees found in two savanna types in southeastern Louisiana; and 2) contrast the diversity and species composition of these two savanna types. An ancillary goal was to contrast two collecting protocols for bees in the savanna habitat. Overall, a total of 3,407 bees were collected representing 125 species. Of …

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Modulation Of Gabaergic Signaling In Retinal Amacrine Cells, Brian Kevin Hoffpauir Jan 2004

Modulation Of Gabaergic Signaling In Retinal Amacrine Cells, Brian Kevin Hoffpauir

LSU Doctoral Dissertations

The intricate circuitry formed by amacrine cells in the inner plexiform layer (IPL) of the retina suggests that these interneurons play a major role in shaping the visual message. The majority of amacrine cells in the vertebrate retina are GABAergic. Thus, elucidating how GABAergic signaling is modulated in the IPL is critical in order to understand how the visual message is processed in the retina. The results presented here suggest that GABAergic signaling between amacrine cells can be modulated by the activation of metabotropic glutamate receptor 5 (mGluR5) or by the production of the second messenger, nitric oxide (NO). A …

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Stormwater Diversion As A Potential Coastal Wetland Restoration Method, Jennifer Howard Woods Jan 2004

Stormwater Diversion As A Potential Coastal Wetland Restoration Method, Jennifer Howard Woods

LSU Master's Theses

The Barataria-Terrebonne estuary has been eroding at a rate of up to 103.6 km2 yr-1 for several decades. If the current rate of loss is not reduced, an additional 2,550 km2 of coastal wetlands will be lost by the year 2050. Currently, stormwater in Terrebonne Parish is pumped into canals, ultimately discharging into the Gulf of Mexico. An opportunity exists to use this stormwater for wetland restoration; however, the ecological impacts of stormwater diversions on wetlands are unknown. The objectives of this project were to 1) to investigate the seed banks of a degraded marsh to determine if a viable …

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Properties Of Borate-Treated Strandboard Bonded With Pmdi Resin, Yiqiang Zhou Jan 2004

Properties Of Borate-Treated Strandboard Bonded With Pmdi Resin, Yiqiang Zhou

LSU Master's Theses

Random strandboards from mixed southern wood species were manufactured using calcium borate (CB) and zinc borate (ZB) as chemical additives and polymeric methylene diphenylmethane disocyanate (pMDI) as resin. There were four target levels of borate loading and two levels of resin content. Panel properties, including modulus of elasticity (MOE), modulus of rupture (MOR), internal bond (IB) strength, linear expansion (LE), thickness swelling (TS), leachability, and swelling and strength retention properties under cyclic relative humidity, were measured. The influence of borate content, borate type, and resin content on various properties was analyzed. It was found that the addition of borate negatively …

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Botany In Children's Literature: A Content Analysis Of Plant-Centered Children's Picture Books That Have A Plot And Characters, Sheila Lewis Goins Jan 2004

Botany In Children's Literature: A Content Analysis Of Plant-Centered Children's Picture Books That Have A Plot And Characters, Sheila Lewis Goins

LSU Doctoral Dissertations

This content analysis study examined 36 plant-centered children’s science picture books that have a plot and characters published from 1950 to present. Botanical subject matter and learning opportunities offered by these books were analyzed, along with the range and frequency of the National Science Education Standards-consistent and age-appropriate plant science concepts and principles. The science graphics, artistic innovations, and story plot of these books were also examined. Rubrics and research-based recommendations were developed to offer parents, teachers, and librarians assistance in identifying, evaluating, and using such books to help children of ages 4-8 learn about plants and enjoy plant science. …

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