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1997

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Cost Analysis And Air Pollution Impact Of Electric Vehicles On A Metropolitan Area., Hector David Arias-Varela Jan 1997

Cost Analysis And Air Pollution Impact Of Electric Vehicles On A Metropolitan Area., Hector David Arias-Varela

LSU Historical Dissertations and Theses

During the 1990's, increasing attention has been paid to electric vehicles (EV's) because of their potential to reduce air pollution in metropolitan areas such as the Los Angeles Metropolitan Area in the U.S., Mexico City and Its Metropolitan Area in Mexico, Greater London in the United Kingdom and other urban areas. However, few studies to determine the costs and benefits of reducing air pollution by introducing EV's into these mega cities have been carried out. A model to determine the marginal costs and environmental impact of electric vehicles on a metropolitan area is designed in this study. The model simulates …

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Interactive Effects Of Weeds And Defoliating Insects In Soybean (Glycine Max)., Charles Frost Grymes Jan 1997

Interactive Effects Of Weeds And Defoliating Insects In Soybean (Glycine Max)., Charles Frost Grymes

LSU Historical Dissertations and Theses

Field experiments were conducted to evaluate the influence of simulated insect defoliation and full season weed competition on soybean (Glycine max (L.) Merr.) growth and yield. Weeds were johnsongrass (Sorghum halepense (L.) Pers.), common cocklebur (Xanthium strumarium L.), and hemp sesbania (Sesbania exaltata (Raf.) Rybd. ex A. W. Hill) at 15, 3, and 12 plants/6 m of row. Simulated defoliation at R2 and R5 soybean growth stages was accomplished by removal of 0, 1, or 2 leaflets per soybean trifoliate, which approximated 0, 33, and 66% defoliation, respectively. Averaged across defoliation levels and stages, johnsongrass, common cocklebur, and hemp sesbania …

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I. Photophysics And Photochemistry Of Molybdenum-Oxo Complexes. Ii. Synthesis Of A Ferrocene-Based Monomer For Use In Ring-Opening Metathesis Polymerization., Ralph Isovitsch Jan 1997

I. Photophysics And Photochemistry Of Molybdenum-Oxo Complexes. Ii. Synthesis Of A Ferrocene-Based Monomer For Use In Ring-Opening Metathesis Polymerization., Ralph Isovitsch

LSU Historical Dissertations and Theses

The brick-red ferrocenophene 1,4-(3,3$\sp\prime$-bis(1,1-dimethylpentyl)-1,1$\sp\prime$-ferrocenediyl) -1,3-butadiene was prepared via a six-step synthetic route. It was isolated and characterized for use as a monomer in Ring Opening Metathesis Polymerization. Fluorescent molybdenum(V)-oxo complexes such as $\rm MoOCl\sb4(H\sb2O)\sp-$ undergo thermal and photochemical reactions with the series of phosphines $\rm PEt\sb2,\ PEt\sb3Ph,\ PEtPh\sb2$ and PPh$\sb3$ as oxygen atom acceptors. PEt$\sb3$ reacts spontaneously to form several products: $\rm (PPh\sb4)\lbrack MoCl\sb4(PEt\sb3)\sb2\rbrack,\ (PPh\sb4)\sb2\lbrack MoOCl\sb5\rbrack{\cdot}2CH\sb2Cl\sb2,$ and a maroon oil that contains $\rm OPEt\sb3,\ MoOCl\sb2(PEt\sb3)\sb3$ and $\rm MoCl\sb4(PEt\sb3)\sb2.$ Both $\rm (PPh\sb4)\lbrack MoCl\sb4(PEt\sb3)\sb2\rbrack$ and OPEt$\sb3$ are products of an oxygen atom transfer reaction. PEt$\sb2$Ph and PEtPh$\sb2$ also produce the corresponding phosphine …

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Late Quaternary Foraminifera From Lower Bathyal And Abyssal Sediments, Gulf Of Mexico: A Record Of Paleoceanographic Change., Megan H. Jones Jan 1997

Late Quaternary Foraminifera From Lower Bathyal And Abyssal Sediments, Gulf Of Mexico: A Record Of Paleoceanographic Change., Megan H. Jones

LSU Historical Dissertations and Theses

Striking late Quaternary surface- and deep-water oceanographic changes and a link to North Atlantic thermohaline circulation are identified by analyses of high-resolution, benthic and planktic foraminiferal census data from the lower bathyal and abyssal Gulf of Mexico (GOM). The recognized environmental, watermass, preservation, and productivity signals reveal a detailed paleoenvironmental and paleoceanographic history. A paleoceanographic model developed for surface and deep waters of the abyssal Gulf describes a four-stage sequence of oceanographic changes from the Last Glacial Maximum (LGM) to the present. Compared to present-day surface waters, those of LGM were nutrient-enriched and had reduced productivity. The influx of glacial …

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Negotiating Literacy Instruction: Pedagogical Perceptions Of Secondary Preservice Teachers., Julie Hill Lester Jan 1997

Negotiating Literacy Instruction: Pedagogical Perceptions Of Secondary Preservice Teachers., Julie Hill Lester

LSU Historical Dissertations and Theses

Secondary teachers face the challenge of planning instructional activities that combine their own subject knowledge with information from textbooks and other forms of text to help students learn content material. This study explores preservice teachers' perceptions regarding literacy instruction within the context of teaching and learning content material. The participants are senior secondary education students enrolled in a content area literacy course at a regional university in the southeast. Case studies are constructed for six preservice teachers representing different content areas. Qualitative data collection procedures included a questionnaire, guided journal entries, literacy autobiography, and personal interviews. Cross-case analysis was employed. …

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Reduction And Management Of Risks Associated With Aflatoxin And Fumonisin Contamination In Corn., Socrates Trujillo Jan 1997

Reduction And Management Of Risks Associated With Aflatoxin And Fumonisin Contamination In Corn., Socrates Trujillo

LSU Historical Dissertations and Theses

Aflatoxins and fumonisins, secondary mold metabolites, occur naturally as co-contaminants in corn. Health and economic risks associated with this contamination of food and feed have been the focus of much research worldwide. Research programs resulting from the discovery of aflatoxins in the 1960's has been used to guide study programs for fumonisins. The establishment of food safety programs, including mycotoxin decontamination procedures, must be evaluated for further application. The evaluation of selected procedures which reduce the risks associated with the contamination of these mycotoxins in food utilized for human and animal consumption was the focus of this study. This study …

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The Use Of Secondarily Treated Wastewater Effluent For Forested Wetland Restoration In A Subsiding Coastal Zone., John M. Rybczyk Jan 1997

The Use Of Secondarily Treated Wastewater Effluent For Forested Wetland Restoration In A Subsiding Coastal Zone., John M. Rybczyk

LSU Historical Dissertations and Theses

Insufficient sedimentation, coupled with high rates of relative sea-level rise (RSLR), are two important factors contributing to wetland loss in coastal Louisiana. I hypothesized that adding nutrient rich, secondarily treated, wastewater effluent to subsiding coastal wetlands in Louisiana could promote vertical accretion in these systems through increased organic matter production and subsequent deposition, and allow accretion to keep pace with estimated rates of RSLR (subsidence plus eustatic sea-level rise). To test this hypothesis, I measured processes affecting wetland elevation including, organic matter decomposition, sediment accretion, aboveground primary production, and, plant tissue nutrient (N, P, K, Ca, Mg, Fe) concentrations, in …

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Preparation Of Strained Nitrogen Heterocycles For Spin Trapping Applications., Anna Patrice Shanklin Jan 1997

Preparation Of Strained Nitrogen Heterocycles For Spin Trapping Applications., Anna Patrice Shanklin

LSU Historical Dissertations and Theses

This work discusses the synthesis of bicyclic nitrogen heteorocycles with the emphasis placed on the design and evaluation of a bicyclic nitrone for spin trapping applications. Camphorolactams, 1,7,7-trimethyl-2-aza-bicyclo(2.2.1) heptan-3-one and 1,7,7-trimethyl-3-azabicyclo (2.2.1) heptan-2-one were prepared from camphoric anhydride under Curtius conditions with sodium azide and dimethylformamide. 2-azabicyclo(2.2.1) heptan-3-one was also prepared under Curtius conditions from cis-1,3-cyclopentane-dicarboxylic acid anhydride. N-benzyl-2-azabicyclo (2.2.1) -heptane and N-benzyl-2-azabicyclo (2.2.2) octane were prepared from their aliphatic amine derivatives under Hofmann-Loeffler conditions in low yields. 1,3,3-trimethyl-6-azabicyclo (3.2.1) octane, N-oxide was prepared from its parent amine under sodium tungstate catalyzed oxidation with hydrogen peroxide. The bicyclic nitrone was …

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Genetics And Functions Of Herpes Simplex Virus Type 1 (Hsv-1) Glycoprotein K (Gk) In Virus Envelopment And Egress., Sukhanya Jayachandra Jan 1997

Genetics And Functions Of Herpes Simplex Virus Type 1 (Hsv-1) Glycoprotein K (Gk) In Virus Envelopment And Egress., Sukhanya Jayachandra

LSU Historical Dissertations and Theses

HSV-1(KOS)$\Delta$gK, a virus lacking the UL53 gene coding for glycoprotein K(gK) was constructed, characterized and compared to the partially deleted gK-null virus HSV-1(F)-gK$\beta$. $\Delta$gK and F-gK$\beta$ viruses produced microscopic plaques on Vero cells at 48 hours post infection. F-gK$\beta$ plaques at 72 hours post infection contained fused cells (syn), while $\Delta$gK plaques resembled wild-type KOS plaques ($syn\sp+$). $\Delta$gK replicated efficiently in exponentially dividing Vero cells whereas F-gK$\beta$ yields were 10 and 1000-fold lower than $\Delta$gK yields in HEp-2 or log-phase Vero cells, respectively. Electron micrographs of $\Delta$gK-infected Vero cells revealed large numbers of capsids in the nuclei of Vero, but …

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High-Resolution Facies Analysis Of Deltaic Subenvironments Of The Pennsylvanian Atoka Formation, Arkansas., Tanwi Gangopadhyay Jan 1997

High-Resolution Facies Analysis Of Deltaic Subenvironments Of The Pennsylvanian Atoka Formation, Arkansas., Tanwi Gangopadhyay

LSU Historical Dissertations and Theses

The present research was aimed at comparison and distinction between various deltaic subenvironments from Pennsylvanian deposits of the Arkoma Basin, Arkansas. Detailed facies analysis of deltaic deposits reveal significant variation in sedimentary characteristics between different subenvironments. A multi-pronged approach, including documentation of measured sections and gamma ray profiles in the field and subsequent laboratory analysis of samples, was undertaken. The Atoka Formation deltaic deposits have been established primarily as representing fluvially-dominated deltas. Interdistributary bay fill deposits are splintery shales with abundant siderite nodules. Crevasse splay sandstone units are ripple cross-laminated and coarsen and thicken upward to a maximum of 60cm …

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Production Of Transgenic Channel Catfish., Mark Christian Bates Jan 1997

Production Of Transgenic Channel Catfish., Mark Christian Bates

LSU Historical Dissertations and Theses

The channel catfish industry has experienced tremendous growth over the last several years. This growth has triggered more intensive culture practices resulting in disease outbreaks and devastating mortalities. Medicated feeds and vaccination have been of limited use. This research presents studies on techniques to produce disease resistant channel catfish by gene transfer. The gene used was the cecropin B gene from the giant silkworm moth Hyalophora cecropia, controlled by an acute phase response (APR) promoter also from H. cecropia. The objectives of this study were to: (1) determine if an early maturing population of catfish from Lake Maurepas, Louisiana, could …

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Growth And Mortality Of Fish Larvae In The Northcentral Gulf Of Mexico And Implications To Recruitment., Bruce Henry Comyns Jan 1997

Growth And Mortality Of Fish Larvae In The Northcentral Gulf Of Mexico And Implications To Recruitment., Bruce Henry Comyns

LSU Historical Dissertations and Theses

Extensive plankton collections were taken during September for several years along the northcentral Gulf of Mexico's inner continental shelf. Significant differences in growth rates were found for both vermilion snapper and Atlantic bumper larvae collected at stations where hydrographic conditions were similar, indicating the probable existence of small-scale patchily-distributed feeding conditions. Such variability in growth rates is probably inevitable given the high variability in the observed spatial and temporal distribution of surface chlorophyll a levels, macrozooplankton biomass, copepod abundance, and dispersion of fish larvae. Cruise estimates of mortality coefficients (Z) for larval vermilion snapper, red drum, and Atlantic bumper were …

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Acute Effects Of Passive Muscle Stretching On The Stretch-Shortening Phenomenon., Andrew Cornwell Jan 1997

Acute Effects Of Passive Muscle Stretching On The Stretch-Shortening Phenomenon., Andrew Cornwell

LSU Historical Dissertations and Theses

Two experiments examined the acute effects of passive muscle stretching on the performance of a skill (vertical jump) which takes advantage of the stretch-shortening phenomenon. Because recent work suggests that passive stretching might impede the mechanisms (elastic and myoelectrical potentiation) thought to be responsible for this phenomenon, it was hypothesized that stretching would decrease the jump height of jumps executed with a preparatory countermovement (CMJ), but not the jump height of those initiated from a static, squatting position (SJ). In the first experiment, subjects performed CMJ and SJ jumps under two different conditions: after passively stretching the knee and hip …

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Characterization Of Bean Eukaryotic Translation Initiation Factor 5: Cloning, Sequencing, And Structure-Function Studies., Zelpha Elizabeth Floyd Jan 1997

Characterization Of Bean Eukaryotic Translation Initiation Factor 5: Cloning, Sequencing, And Structure-Function Studies., Zelpha Elizabeth Floyd

LSU Historical Dissertations and Theses

Translation initiation is emerging as one of the important mechanisms involved in regulation of gene expression and our understanding of this process in eukaryotes has greatly increased over the past twenty years. Research in translation initiation in plants has lagged behind efforts in the mammalian system and a number of the initiation factors have not been characterized. Eukaryotic initiation factor 5 (eIF5), the protein mediating hydrolysis of the eIF2-bound GTP and the subsequent formation of the 80S ribosome, is among the least characterized initiation factor in plants. This dissertation describes the cloning of the cDNA encoding eIF5 from a bean …

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Self-Schemata For Sport And Physical Activity: The Influence Of Race And Gender., Louis Harrison Jr Jan 1997

Self-Schemata For Sport And Physical Activity: The Influence Of Race And Gender., Louis Harrison Jr

LSU Historical Dissertations and Theses

The most recent Surgeon General's report underscores the need for increased levels of regular physical activity in the general population, and in women and minorities in particular. Variations in participation patterns in particular sports and physical activities may provide insight into the reasons for differing activity levels in women and minorities. The present investigation studied the influence of race and gender on activity choices by regarding specific sport and physical activities as self-defining for race and gender groups. Study 1 was designed to confirm the existence of self-schemata for sport and physical activities. A computer generated instrument was employed to …

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Cloning, Sequencing And Regulation Of The Rhodobacter Capsulatus Hemh Gene., Ekaterina Vladislavova Kanazireva Jan 1997

Cloning, Sequencing And Regulation Of The Rhodobacter Capsulatus Hemh Gene., Ekaterina Vladislavova Kanazireva

LSU Historical Dissertations and Theses

Rhodobacter capsulatus, a purple non-sulfur photosynthetic bacterium, synthesizes four tetrapyrrole end products: heme, bacteriochlorophyll, siroheme and vitamin B$\sb{12}$ via the common tetrapyrrole biosynthetic pathway. The biosynthesis of tetrapyrroles in R. capsulatus is a complex and precisely controlled process which has been under extensive investigation. In order to study the regulation of tetrapyrrole biosynthesis, the R. capsulatus hemH gene was cloned by complementation of an E. coli $\Delta hemH$ mutant and sequenced. The enzyme ferrochelatase, encoded by the hemH gene, catalyzes the insertion of ferrous iron into protoporphyrin IX, thus producing heme. The consensus ferrochelatase signature sequence was found in the …

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Identification Of The Physiological Role Of Carbonic Anhydrase Using The Antisense Technique, And, Investigation Of Its Transcriptional Regulation In Arabidopsis Thaliana (L.) Heynh., Hee Jin Kim Jan 1997

Identification Of The Physiological Role Of Carbonic Anhydrase Using The Antisense Technique, And, Investigation Of Its Transcriptional Regulation In Arabidopsis Thaliana (L.) Heynh., Hee Jin Kim

LSU Historical Dissertations and Theses

Carbonic anhydrase (CA, EC 4.2.1.1), catalyzes the interconversion of CO$\sb2$ and $\rm HCO\sb3\sp-$ in many organisms. The majority of CA activity in C3 leaves is in the chloroplast and expression of the chloroplast CA is regulated by light. To investigate the physiological role of the chloroplast CA, its expression was suppressed by insertion of a CA transgene in the antisense orientation in Arabidopsis thaliana (L.) Heynhold. Activity assays and immunoblots show that in five independent lines of antisense transgenic plants CA activity was strongly suppressed. All five independent lines died or grew poorly in the absence of sucrose whereas wild …

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The Influence Of Violence Upon Academic Achievement Among African American First Time College Students., Diana F. Kelly Jan 1997

The Influence Of Violence Upon Academic Achievement Among African American First Time College Students., Diana F. Kelly

LSU Historical Dissertations and Theses

This study examined the relationship between early exposure to violence--both personal and community--and the later academic achievement of African American first time college students. The study incorporated several variables that were thought to impinge upon the academic achievement process. Specifically, those variables were divided into several groups: background factors (socioeconomic status, high school academic record, personal and community violence exposure), student characteristics (locus of control, educational aspirations and expectations), and university characteristics (campus safety, academic and social integration). Student achievement was measured by students' expected grade point average, as indicated on a student questionnaire. University administrators, professors, and researchers who …

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Structure-Activity Relationships Of Nitroarenes: Mutagenicity, Oxygen Consumption, Toxicity, And Xenobiotic Radical Production., Caroline Ann Metosh-Dickey Jan 1997

Structure-Activity Relationships Of Nitroarenes: Mutagenicity, Oxygen Consumption, Toxicity, And Xenobiotic Radical Production., Caroline Ann Metosh-Dickey

LSU Historical Dissertations and Theses

The nitroreduction of 4NQO and five structural analogs were studied with respect to radical production and mutagenicity. In the umu assay, 4NQO was the most mutagenic analog. Addition of microsomal and cytosolic protein from induced and uninduced rat liver samples decreased 4NQO mutagenicity in the standard strain (Salmonella typhimurium TA 1535/psk1002) 4NQO mutagenicity was also found to be decreased in the nitroreductase-deficient strain (Salmonella typhimurium TA1535NR/psk1002). In several strains of the Protox$\rm\sp{TM}$ assay 4NQO yielded the highest induction rate as compared to other compounds tested. In the presence of ascorbate 4NQO cytotoxicity, but not mutagenicity, was substantially enhanced. Oxygen consumption …

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Academic Discipline, Mentoring, And The Career Commitment Of Women Faculty., Gloria Tara Nye Jan 1997

Academic Discipline, Mentoring, And The Career Commitment Of Women Faculty., Gloria Tara Nye

LSU Historical Dissertations and Theses

Women continue to be underrepresented as faculty at U.S. universities, especially in the physical sciences and engineering. The belief that only women can adequately serve as role models and mentors for other women may be a roadblock to progress for women in disciplines where they are underrepresented. This study of women faculty investigates how female career commitment is influenced by academic discipline and mentoring. The survey responses of sixty-six tenure-track women faculty were used to obtain data for both science or engineering and non-science or engineering academic disciplines at three public Ph.D. granting research universities. The women faculty in science …

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The Recycling Potential Of Out-Of-Service Utility Poles For Engineered Wood Products., Han Roliadi Jan 1997

The Recycling Potential Of Out-Of-Service Utility Poles For Engineered Wood Products., Han Roliadi

LSU Historical Dissertations and Theses

This study on the recycling potential of out-of-service poles for use in engineered wood products involved determination of basic properties of used southern pine (Pinus sp.) utility poles and also manufacture of glued-laminated beams from these poles. Most of the defect-free portions of 25-year treated poles still retained adequate strengths comparable to those of freshly treated poles and untreated southern pine. Creosote contents, however, diminished with pole ages. The reduction in creosote content was correlated with lower decay resistance, poorer dimensional stability, and lower lumber recovery, but better gluability. The spectrometry method for creosote content determination was explored as an …

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Nature, Culture And Big Old Trees: Human Relationships With Ceiba (Ceiba Pentandra) And Live Oak (Quercus Virginiana) In The Landscapes Of Guatemala And Louisiana., Katharine Anderson Jan 1997

Nature, Culture And Big Old Trees: Human Relationships With Ceiba (Ceiba Pentandra) And Live Oak (Quercus Virginiana) In The Landscapes Of Guatemala And Louisiana., Katharine Anderson

LSU Historical Dissertations and Theses

The ceiba in Guatemala and the live oak in Louisiana are examples of two trees that attain great size and age within the cultural landscape. Humans have adopted both as symbolic trees; they protect, encourage and even plant them. As the trees age, they become historic landmarks, are indicators of important places, and give character to the landscape. Although each tree is native within portions of each study area, both have taken advantage of human disturbance to expand beyond their original habitats. In addition, they have been moved deliberately by humans to new areas well beyond their geographical limits. Other …

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Macrofaunal Community Structure In The Introduced And Native Submerged Macrophyte Beds Of The Lake Pontchartrain Estuary., Kenneth Charles Duffy Jan 1997

Macrofaunal Community Structure In The Introduced And Native Submerged Macrophyte Beds Of The Lake Pontchartrain Estuary., Kenneth Charles Duffy

LSU Historical Dissertations and Theses

Introductions of exotic aquatic plants raise concerns for the health of assemblages of native species. The possible influence of the establishment of the exotic Eurasian watermilfoil Myriophyllum spicatum on fish and invertebrate assemblages in the Lake Pontchartrain estuary was examined with a microhabitat approach. Fish and invertebrate assemblage structure and population responses were compared among macrophyte species and unvegetated areas. Native macrophytes included wild celery Vallisneria americana and wigeongrass Ruppia maritima. Additionally, the relationships of the common submerged macrophytes to environmental and temporal variables were analyzed. A total of 517 samples, collected with a modified Wegener ring, included 3,564 fishes …

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Coastal Management Regarding Beach And Dune Protection: An Exploratory Analysis., Melissa Lee Gordon Jan 1997

Coastal Management Regarding Beach And Dune Protection: An Exploratory Analysis., Melissa Lee Gordon

LSU Historical Dissertations and Theses

The Congressional declaration of national coastal policy in Section 303 of the Federal Coastal Zone Management Act (CZMA) of 1972 charges the coastal states to meet the objective of coastal resource protection. At this time, when the appropriate mix of authority between federal and state governments concerning environmental regulations is in debate; it is important to determine whether the inter-governmental partnership created by CZMA is effective in protecting coastal resources. This research is an exploratory analysis of coastal management regarding beach and dune protection within the twenty-four coastal states. The dissertation objectives are as follows: (1) determine the level of …

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Genotype By Environment Interaction For Ear Moisture Loss Rate In Corn., Robert T. Magari Jan 1997

Genotype By Environment Interaction For Ear Moisture Loss Rate In Corn., Robert T. Magari

LSU Historical Dissertations and Theses

Corn (Zea mays L.) hybrids with rapid ear moisture loss rate (EMLR) are needed to reduce post-harvest production costs relative to artificial grain drying. Previous investigations indicated that genetic variation for grain dry-down rate existed; however, genotype by environment interaction (GEI) for this trait has not been specifically investigated. The objectives of this study were: (1) to evaluate EMLR and stability of selected commercial corn hybrids in different environments, (2) to determine approximate optimum numbers of plants per plot, replications, and environments for evaluating EMLR, and (3) to assess the contribution of known environmental factors to GEI for EMLR. Experiments …

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Development And In Vivo Evaluation Of A Pura Mutant Strain Of The Channel Catfish Pathogen Edwardsiella Ictaluri., Mark Lee Lawrence Jan 1997

Development And In Vivo Evaluation Of A Pura Mutant Strain Of The Channel Catfish Pathogen Edwardsiella Ictaluri., Mark Lee Lawrence

LSU Historical Dissertations and Theses

Edwardsiella ictaluri is the causative agent of enteric septicemia of catfish (ESC), which is the most serious disease affecting the channel catfish industry. Killed vaccines have been inconsistent in providing protection against ESC, and no live attenuated vaccines have been described. The purpose of this study was to develop a nutritionally attenuated mutant strain of E. ictaluri and evaluate its virulence and vaccine efficacy. An E. ictaluri genomic library was constructed, and a clone containing the purA gene was isolated and sequenced. The E. ictaluri purA gene was found to have several features in common with the E. coli purA …

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The Radioresistance Of Deinococcus Radiodurans., Valerie Mattimore Jan 1997

The Radioresistance Of Deinococcus Radiodurans., Valerie Mattimore

LSU Historical Dissertations and Theses

Deinococcus radiodurans is a remarkably ionizing radiation resistant bacterium. As a vegetative cell it is capable of withstanding 5,000 Gy ionizing radiation without evidence of death or mutation. D. radiodurans survives irradiation by repairing DNA damage via an extremely efficient DNA repair system. However, this DNA repair system has not been completely defined. In addition, the selective process allowing the evolution of high level radioresistance has remained a question. This dissertation bolsters the understanding of the DNA repair system of D. radiodurans by characterizing a collection of ionizing radiation sensitive (IRS) mutants. The level of radioresistance is quantified and transformation …

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Acid Solubilization Of Fish Protein For Production Of Protein Hydrolysate., Ercument Ozer Jan 1997

Acid Solubilization Of Fish Protein For Production Of Protein Hydrolysate., Ercument Ozer

LSU Historical Dissertations and Theses

The mechanism of fish protein solubilization by acid hydrolysis at elevated temperatures was investigated. Rate expressions for the solubilization were determined using pilot scale data with two different rate determination methods. A postulated mechanism was verified and estimated rates were evaluated on five independent verification experiments. A functional relationship between nonprotein byproduct concentration and whiteness of fish protein hydrolysate (FPH) was developed. Initial and set-point operating variables were calculated to produce FPH with acceptable color characteristics for food use. A batch reactor was used for duplicate hydrolysis trials conducted at three acid and three temperature levels for four hours. Samples …

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Visualizing Autobiography: Intersections Of Gender, Representation, Curriculum Theory., Anne Elizabeth Pautz Jan 1997

Visualizing Autobiography: Intersections Of Gender, Representation, Curriculum Theory., Anne Elizabeth Pautz

LSU Historical Dissertations and Theses

Defined by customs of femininity, women who transcend those definitions find it difficult to represent themselves in a comprehensible manner. The contradictions between the actual activities of life and the demands of femininity require woman to adopt unique approaches to self-representation in order to be accepted. Tied to the biological functions of their bodies through images in the media and social institutions, as well as their internalized images, women often find trying to represent themselves beyond or against their body problematic. The female body is presented as controller of destiny, both through beauty and motherhood requirements. Women often create representations …

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Survival And Development Of The Stemborer Chilo Partellus (Swinhoe) (Lepidoptera:Pyralidae) On Selected Wild Gramineous Plants, Mohamed Hassan Mohamud Jan 1997

Survival And Development Of The Stemborer Chilo Partellus (Swinhoe) (Lepidoptera:Pyralidae) On Selected Wild Gramineous Plants, Mohamed Hassan Mohamud

All Master’s Theses

A major constraint to increase the production of maize is competition from phytophagous insects. The Lepidopteran stem borer, Chilo partellus (Swinhoe) (Lepidoptera: Pyralidae), is considered to be one of the most damaging insect in Eastern and Southern Africa. Understanding the role of wild alternate host plants in sustaining stem borer population is important for development of crop protection strategies. A comparative study was therefore undertaken to determine the behaviour and biology of C. partellus on selected wild and cultivated host plants. The host plants included susceptible maize (Inbred A) and five wild host plant species of familily Poaceae (Graminae) - …

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