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Design And Analysis Of Optical Interconnection Networks For Parallel Computation., Yueming Li Jan 1997

Design And Analysis Of Optical Interconnection Networks For Parallel Computation., Yueming Li

LSU Historical Dissertations and Theses

In this doctoral research, we propose several novel protocols and topologies for the interconnection of massively parallel processors. These new technologies achieve considerable improvements in system performance and structure simplicity. Currently, synchronous protocols are used in optical TDM buses. The major disadvantage of a synchronous protocol is the waste of packet slots. To offset this inherent drawback of synchronous TDM, a pipelined asynchronous TDM optical bus is proposed. The simulation results show that the performance of the proposed bus is significantly better than that of known pipelined synchronous TDM optical buses. Practically, the computation power of the plain TDM protocol …

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Tribological Behavior Of Duplex Nitrogen Diffusion/Dlc Coating Treatments., Yan Liu Jan 1997

Tribological Behavior Of Duplex Nitrogen Diffusion/Dlc Coating Treatments., Yan Liu

LSU Historical Dissertations and Theses

Diamond-like carbon (DLC) coatings have high potential for developing advanced tribological systems and the overall objective of the present research is to provide a framework to theoretically design and experimentally develop and study such systems of interest. The present research concentrates on the following specific aspects: the fundamental wear mechanism of DLC coatings; finite element (FE) modeling to understand the stress distribution in coating/substrate system under indentation and friction; and the influence of graded interface on the tribological behavior of DLC coatings. The experimental results showed that DLC films possess low friction coefficient ($f\sb{init}$: 0.12-0.20, $f\sb{fin}$: 0.06-0.08) and low wear …

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The Development Of Behavioral And Emotional Self-Regulation During The Preschool Period., Maria D. Kalpidou Jan 1997

The Development Of Behavioral And Emotional Self-Regulation During The Preschool Period., Maria D. Kalpidou

LSU Historical Dissertations and Theses

The study investigates age-related changes in behavioral and emotional self-regulation during the preschool period and the relationship between them. Behavioral self-regulation was measured by compliance without external monitors. Emotional self-regulation was measured by the expressed control of emotions and coping strategies. Eighty-eight preschoolers (45 5-year-olds; 43 3-year-olds) participated in a compliance-delay task. They were left alone for 10 min (self-regulated compliance) to sort cutlery in the presence of toys. The demand for emotional self-regulation was manipulated by hiding (low demand) or exposing (high demand) the toys. Children experienced both sessions. All procedures were video-taped. The expressed emotional comfort during the …

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Activity Of Selected Insecticides Against The Soybean Looper, Pseudoplusia Includens (Walker), Using An Artificial Diet Overlay Bioassay Technique: Dosage Mortality, Discriminating Concentrations, And Resistance Monitoring., Rosanne Nicholson Mascarenhas Jan 1997

Activity Of Selected Insecticides Against The Soybean Looper, Pseudoplusia Includens (Walker), Using An Artificial Diet Overlay Bioassay Technique: Dosage Mortality, Discriminating Concentrations, And Resistance Monitoring., Rosanne Nicholson Mascarenhas

LSU Historical Dissertations and Theses

Diet overlay bioassays were conducted, evaluating insecticides requiring ingestion, on 3rd instar soybean loopers, Pseudoplusia includens (Walker). Laboratory reference and field strains were exposed to several insecticide concentrations, and LC$\sb{50}$s were compared. Field strains had significantly greater LC$\sb{50}$s than the reference strain when evaluating standard insecticides. Bioassays with experimental insecticides revealed few differences among strains. The diet overlay technique appears to be a viable method for monitoring insecticide resistance to these insecticides. Insecticide discriminating concentrations were determined using diet overlay bioassays to evaluate susceptibility of field and F1 generation, laboratory and field soybean looper strains. Field strains, exposed to permethrin …

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Numerical Simulation Of Geosynthetic Reinforced Earth Structures Using Finite Element Method., Surajit Pal Jan 1997

Numerical Simulation Of Geosynthetic Reinforced Earth Structures Using Finite Element Method., Surajit Pal

LSU Historical Dissertations and Theses

Geosynthetics are widely used as reinforcements in various earth structures. Current design methods are based on some simplified assumptions and are primarily modified versions of limit equilibrium methods used in design of the unreinforced earth structures. All of these design methods are conservative and result in uneconomical design. The best method for verifying the design assumptions and studying the stress-deformation behavior of geosynthetic reinforced earth structures is by constructing a series of large scale test walls with adequate instrumentation and collecting data from them. But the cost involved in such a scheme precludes undertaking this kind of study. Thus Numerical …

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Radio-Frequency Impedance Measurements On Thin Films Of Yttrium Barium Copper Oxide., Vibha K. Pant Jan 1997

Radio-Frequency Impedance Measurements On Thin Films Of Yttrium Barium Copper Oxide., Vibha K. Pant

LSU Historical Dissertations and Theses

The Kosterlitz-Thouless phase transition in epitaxial films of YBCO of varying thickness is studied. The phase transition is found to occur in these films in both zero fields and in perpendicular and parallel magnetic fields up to 0.5 T. In addition, the same transition is seen in a lead film of thickness less than the penetration depth in lead. This measurement is used as a calibration to determine the penetration depth in YBCO for both the zero-field case and perpendicular-field case. Once the penetration depth is determined, the effective thickness of the superconducting layer is calculated for all the films. …

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Determination Of Hydrocarbon Type From The Dual-Spaced Neutron Tool Responses., Luis Fernando Quintero Jan 1997

Determination Of Hydrocarbon Type From The Dual-Spaced Neutron Tool Responses., Luis Fernando Quintero

LSU Historical Dissertations and Theses

A new interpretation method that allows for the determination of the fluid type present in a formation of interest was developed. The new method is referred to as the "Three Neutron Porosity Log". The method is based on an algorithm that determines three apparent neutron porosities. These porosities, derived from the raw counts of the dual-spaced neutron tool, have three different radii of investigation. All three neutron porosities, near, far, and ratio, when properly calibrated read the true porosity in water-bearing zones. In oil or gas-bearing zones the mud filtrate invasion profile will cause the three apparent neutron porosities to …

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Traffic Management And Congestion Control In The Atm Network Model., Sundararajan Vedantham Jan 1997

Traffic Management And Congestion Control In The Atm Network Model., Sundararajan Vedantham

LSU Historical Dissertations and Theses

Asynchronous Transfer Mode (ATM) networking technology has been chosen by the International Telegraph and Telephony Consultative Committee (CCITT) for use on future local as well as wide area networks to handle traffic types of a wide range. It is a cell based network architecture that resembles circuit switched networks, providing Quality of Service (QoS) guarantees not normally found on data networks. Although the specifications for the architecture have been continuously evolving, traffic congestion management techniques for ATM networks have not been very well defined yet. This thesis studies the traffic management problem in detail, provides some theoretical understanding and presents …

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The Myth Of Narcissus And The Narcissistic Structure., Joachim Conrad Hermann Vogeler Jan 1997

The Myth Of Narcissus And The Narcissistic Structure., Joachim Conrad Hermann Vogeler

LSU Historical Dissertations and Theses

Since Freud's article "On Narcissism," behavioral psychologists have predominantly viewed this phenomenon as a personality disorder. This dissertation, in contrast, provides a psychoanalytic, i.e., Lacanian reading of the myth of Narcissus as it is recorded in classical literature, and brings about an understanding of the myth's underlying structure. The four fundamental exigencies of the myth's structure include the incest prohibition which symbolically castrates the human subject, the incestuous desire as a result of this prohibition, the displacement of this desire for another imaginary object, and the obsessive quest of that image as the symptom. This structure--defined as narcissistic structure and …

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Coastal Restoration Using Pipeline-Conveyed Sediments., Catherine Faith Voisin Jan 1997

Coastal Restoration Using Pipeline-Conveyed Sediments., Catherine Faith Voisin

LSU Historical Dissertations and Theses

A spreadsheet program was successfully developed which determines the engineering requirements for pipeline transport of sediments from dredge sites to wetland restorations sites. The program called SLURRY.XLS involves several new correlations. A new correlation for determining the critical velocity of particle transport is presented. New correlations were statistically developed for determining the drag coefficient of particles. The spreadsheet also successfully determines settling velocities of the individual particle sizes in any settling regime. A second spreadsheet program entitled "CONSOL.XLS" uses geotechnical principles of consolidation for determining marsh surface elevation with and without hydraulic fill versus time. The CONSOL.XLS program permits the …

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The Development Of A New Deal Land Policy: Fergus County, Montana (1900-1945)., Melissa Gilbert Wiedenfeld Jan 1997

The Development Of A New Deal Land Policy: Fergus County, Montana (1900-1945)., Melissa Gilbert Wiedenfeld

LSU Historical Dissertations and Theses

Encouraged by the Enlarged Homestead Act, higher than average rainfall, and various boosters, thousands of Americans homesteaded in Montana and the northern Great Plains during the 1910s. The agricultural economy boomed during World War I, but the post-war contraction during the 1920s, coupled with drought, caused serious economic problems for farmers. In response to the problems in the agricultural economy, a Land Utilization movement emerged, led by agricultural economists such as Lewis C. Gray. Land utilizationists believed that a readjustment of land use would correct the problems in the agricultural economy. Toward that end they sought changes in federal land …

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Characterization Of Monomer-Containing Monolayer Films On Au Surfaces., Robert J. Willicut Jan 1997

Characterization Of Monomer-Containing Monolayer Films On Au Surfaces., Robert J. Willicut

LSU Historical Dissertations and Theses

Exploration into the nature of ultrathin, surface-confined films capable of electronic conduction has been the primary purpose of this dissertation. Specifically, the confinement of pyrrole monomer to Au surfaces through organosulfur linkages has been investigated. The synthesis of these new $\omega$-(N-pyrrolyl)alkanethiols is described herein. Cyclic voltammetry was utilized in this work to polymerize the monolayers and characterize the resulting films. Voltammetric analysis yielded currents in the correct potential region for poly(N-alkylpyrrole) charging/discharging. Other electrochemical studies revealed the ability of strong nucleophiles and electroinactive diluents to quench surface-confined polymer formation though they did not affect oxidation of the monomer. Exchange experiments …

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Fluorescence Lifetime Discrimination Of Near-Infrared Dye-Labeled Oligonucleotide Fragments Separated By Capillary Gel Electrophoresis For Base-Calling Applications In Dna Sequencing., Benjamin Leighton Legendre Jr Jan 1997

Fluorescence Lifetime Discrimination Of Near-Infrared Dye-Labeled Oligonucleotide Fragments Separated By Capillary Gel Electrophoresis For Base-Calling Applications In Dna Sequencing., Benjamin Leighton Legendre Jr

LSU Historical Dissertations and Theses

The research presented in this dissertation involves the construction of a near-infrared time-correlated single photon counting system which utilizes a mode-locked Ti:sapphire or pulsed diode laser as the excitation source and single photon avalanche diode as the photodetector and the subsequent study of two simple algorithms, the Maximum Likelihood Estimator (MLE) and the Rapid Lifetime Determination (RLD) methods, for fluorescence lifetime determination. The purpose of this research is to aid in the development of a low cost, highly efficient, and high throughput device for DNA sequencing which utilizes near-IR fluorophores which have similar absorption and emission properties but possess unique …

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Franz Liszt's Transcription Of Johann Sebastian Bach's Prelude And Fugue In A Minor (Bwv 543)., Tingwen Tina Shao Jan 1997

Franz Liszt's Transcription Of Johann Sebastian Bach's Prelude And Fugue In A Minor (Bwv 543)., Tingwen Tina Shao

LSU Historical Dissertations and Theses

Franz Liszt's piano transcription of Johann Sebastian Bach's Prelude and Fugue in A Minor for organ (BWV 543) is the primary focus of this study. Liszt was a great admirer of Bach's works; therefore, his transcription is very true to the original, changes being made only to make the organ work more playable on the piano. Chapter One sketches the important roles of both composers in keyboard literature. Chapter Two includes information on Bach as an organist and transcriber during the Weimar (1708-1717) and Leipzig (1723-1750) periods. Chapter Three focuses on Liszt as an organist and his personal ideas for …

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Solid State Energy Barriers To Olefin Ligand Rotation Of Rhodium Compounds And Single Crystal X-Ray Structure Determination Of Synthetic And Natural Products., Yen-Hsiang Liu Jan 1997

Solid State Energy Barriers To Olefin Ligand Rotation Of Rhodium Compounds And Single Crystal X-Ray Structure Determination Of Synthetic And Natural Products., Yen-Hsiang Liu

LSU Historical Dissertations and Theses

Atomic displacement parameters (ADPs) were derived from X-Ray diffraction data collected at two different temperatures (294K and 115K) from a single crystal of Rh(acac)(C$\rm\sb2H\sb4)\sb2.$ Since the thermal ellipsoids of atoms in the one crystallographically independent ethylene group displayed distinctive elongation normal to the C=C bond, a TLS rigid body analysis of the $\rm C\sb2H\sb4$ ligand rotation was undertaken. Using a locally modified version of Trueblood's THMA14 computer program, it was found that at 115K the root-mean-square amplitude of libration normal to the Rh-(CC centroid) axis is $7(4)\sp\circ,$ while at 294K it is $10(6)\sp\circ$ (estimated standard deviations in parentheses). The rotational …

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Linear Matrix Inequality Approach To Robust Emergency Lateral Control Of A Highway Vehicle With Time-Varying Uncertainties., Robert Edward Benton Jr Jan 1997

Linear Matrix Inequality Approach To Robust Emergency Lateral Control Of A Highway Vehicle With Time-Varying Uncertainties., Robert Edward Benton Jr

LSU Historical Dissertations and Theses

New linear-matrix-inequality (LMI) based methods are developed for the static-output-feedback stabilization and reduced-gain static-output-feedback stabilization of time-invariant systems. Unlike previous methods, the static-output-feedback method is non-iterative in LMI solutions. The methods are extended to design robust static-output-feedback controllers for time-varying systems using a polytopic-systems approach. Examples are given which demonstrate the use of each of the new methods. The specific problem of emergency lateral control of a highway vehicle is then addressed using the new robust static-output-feedback method. A controller is designed which robustly stabilizes the vehicle over the range of highway speeds (15 to 30 m/s) and a range …

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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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Development Of Thin Gold Film Thermal Sensors For Synchrotron X-Ray Exposure Diagnostics., Harish M. Manohara Jan 1997

Development Of Thin Gold Film Thermal Sensors For Synchrotron X-Ray Exposure Diagnostics., Harish M. Manohara

LSU Historical Dissertations and Theses

High aspect ratio lithography utilizes high intensity exposure sources, such as synchrotron storage rings, to deposit sufficient dose in the resist to produce a successful pattern transfer. Such highly powerful sources are known to cause undesirable thermal effects in the mask-resist-substrate system. Hence, the measurement of temperature of a mask-resist-substrate system during irradiation is an important exposure diagnostic feature. Deposition of a reasonably accurate dose in the resist is controlled by knowledge of the exposure source intensity. Periodic monitoring of the synchrotron radiation beam power and its spatial distribution at the exposure plane is necessary. In this research, diagnostic techniques …

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A Comparison Of Leonard Bernstein's Incidental Music For The Film "On The Waterfront" And The Subsequent "Symphonic Suite" For The Film, And An Original Composition: Symphony No. 1: "Music For Theater"., Stephen John Lias Jan 1997

A Comparison Of Leonard Bernstein's Incidental Music For The Film "On The Waterfront" And The Subsequent "Symphonic Suite" For The Film, And An Original Composition: Symphony No. 1: "Music For Theater"., Stephen John Lias

LSU Historical Dissertations and Theses

The first portion of this dissertation compares Leonard Bernstein's incidental music to the film On the Waterfront with the subsequent concert suite that was derived from this score. By exploring the content of the film score, as well as the manner in which this music was adapted for the suite, some excellent insight can be gained into Bernstein's approach to both works, as well as the many requirements that the cinematic idiom places on the composer. Special attention is paid to the degree to which the dramatic content of the film influenced the construction of the incidental music. In the …

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An Empirical Examination Of The Grant Induced Price And Income Effects Of Lump-Sum Intergovernmental Aid., Peter Michael Mitias Jan 1997

An Empirical Examination Of The Grant Induced Price And Income Effects Of Lump-Sum Intergovernmental Aid., Peter Michael Mitias

LSU Historical Dissertations and Theses

This work is concerned with the nature of fiscal illusion and its effect on local government spending. Fiscal illusion is hypothesized to be a source of the "flypaper effect." The flypaper effect is an empirical phenomenon of the asymmetric effects of income and intergovernmental aid on the level of local public spending in the context of demand models of the local fisc. Lump sum aid is observed to be more stimulative on the level of public expenditures than income (Gramlich and Galper 1973). As a method of explaining this phenomenon, tax-price and income illusion are incorporated into demand models of …

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Wood Fiber Reinforced Polypropylene Composites., Minqiu Lu Jan 1997

Wood Fiber Reinforced Polypropylene Composites., Minqiu Lu

LSU Historical Dissertations and Theses

Mechanical properties of polypropylene (PP)/wood fiber composites depend not only on the properties of each primary component but also on a complex interaction of several factors such as fiber loading and size, characteristics of fiber-polymer matrix interface, and the processing conditions. Both sequential and simultaneous composites are formulated in this research. First, sequential composites are made by compounding wood fibers with PP in the presence of maleated polypropylene (MPP) as a coupling agent in a twin-screw extruder. A small amount of MPP (1 wt%) present in these sequential composites can increase the tensile strength of the composites significantly. The tensile …

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A Search For Biologically Active Phytochemicals From Endemic Plants Of The Southeastern United States., Steven Lynn Robbs Jan 1997

A Search For Biologically Active Phytochemicals From Endemic Plants Of The Southeastern United States., Steven Lynn Robbs

LSU Historical Dissertations and Theses

In an investigation of allelopathy in the Florida scrub, bioassays with terpenes were performed against: Lactuca sativa, Rudbeckia hirta, Leptochloa dubia and Schizachyrium scoparium. Cineole was phytotoxic against Rudbeckia at 17 ppm and Lactuca at 165 ppm. (S)-camphor was phytotoxic to Rudbeckia at 1 ppm, Lactuca at 28 ppm, and Leptochloa and Schizachyrium at 134 ppm. (R)-Camphor, myrtenol and myrtenal were phytotoxic against Rudbeckia at concentrations of 28, 25 and 15 ppm respectively. Farnesol stimulated the germination of Schizachyrium at concentrations up to 50 ppm and at 100 ppm it reduced the radicle length of all test species. Geraniol stimulated …

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Fathers As Intervention Agents: Parent Training With Fathers Of Children With Developmental Disabilities., Deirdre West Russell Jan 1997

Fathers As Intervention Agents: Parent Training With Fathers Of Children With Developmental Disabilities., Deirdre West Russell

LSU Historical Dissertations and Theses

Previous research on parent training with children who have developmental disabilities has typically failed to include fathers. Compared to research on mothers of children with disabilities and fathers of normally developing children, little is known about fathers of children who have disabilities. In the present study, effects of behavioral parent training on fathers' parenting behaviors (instruction giving, positive attention, and correct consequences) were evaluated. The experimenter trained four fathers of children with developmental delays in the home using written handouts, verbal instructions, modeling, and performance feedback. Training was directed at increasing correct use of fathers' instruction giving, positive attention following …

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The Moral Atmosphere Of The Elementary School And The Question Of Gender., Suzanne Beauclair Roy Jan 1997

The Moral Atmosphere Of The Elementary School And The Question Of Gender., Suzanne Beauclair Roy

LSU Historical Dissertations and Theses

The purpose of this qualitative study was to explore the moral atmosphere of the elementary school and ask: How does the elementary school principal contribute to the moral atmosphere of the elementary school? In addition to this question, this study also explored the likenesses and differences between male principals and female principals in regard to the degree to which the principal practiced either an "ethic of care" or an "ethic of justice." Four case studies were constructed using data collected from observations and interviews that were conducted in four elementary schools. Also, two female principals and two male principals were …

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The Effects Of Sleep Deprivation On Information Processing, New Learning, And Memory In Mildly Head-Injured Subjects With Post-Concussion Symptoms., Brian Betz Jan 1997

The Effects Of Sleep Deprivation On Information Processing, New Learning, And Memory In Mildly Head-Injured Subjects With Post-Concussion Symptoms., Brian Betz

LSU Historical Dissertations and Theses

Subjects who had sustained a mild head injury (MHI) and uninjured control subjects were examined before and after 36 hours of sleep deprivation. MHI subjects and uninjured controls were selected from among individuals who scored above the 50$\rm\sp{th}$ percentile on the Postconcussion Syndrome Checklist (PCSC), a measure designed to assess the frequency, intensity and duration of postconcussion symptoms. Sixty subjects were divided into four groups: Head injured/sleep deprived, head injured/non-sleep deprived, uninjured/sleep deprived, and uninjured/non-sleep deprived. Performance was compared among the groups on the Selective Reminding Test (SRT) and the Paced Auditory Serial Addition Test (PASAT), which are designed to …

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Electron Scattering Studies In The Framework Of The Symplectic Shell Model., Jutta Escher Jan 1997

Electron Scattering Studies In The Framework Of The Symplectic Shell Model., Jutta Escher

LSU Historical Dissertations and Theses

Electron scattering offers numerous advantages for studying nuclear structure: the weakness of the electromagnetic interaction, the precise knowledge of the reaction mechanism, the ability to vary independently the transferred momentum and energy, as well as the excellent spatial resolution that can be obtained with the point-like probing particles, have made this approach a valuable tool in nuclear physics. Scattering experiments provide crucial tests for the applicability and limitations of modern nuclear models and further our understanding of the nucleon-nucleon interaction and its modifications in nuclear matter. A microscopic theory for deformed nuclei, which takes proper account of the Exclusion Principle …

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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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The Effects Of Augmented Feedback On Students' Perceptions And Performance., Karen Anne Buckner Fredenburg Jan 1997

The Effects Of Augmented Feedback On Students' Perceptions And Performance., Karen Anne Buckner Fredenburg

LSU Historical Dissertations and Theses

The focus of this study was to investigate the effects of various augmented feedback conditions on students' self-perceptions of ability (SPA), practice behaviors, and performance during motor skill instruction of a novel task. Fourth grade physical education students (n = 103) participating in a one week instructional unit on the skill of cupstacking were randomly assigned to one of four feedback conditions: (a) no feedback, (b) motivational feedback, (c) task or informational feedback, and (d) motivational and task feedback combined. While students practiced simple (3 x 6 x 3) and complex (1 x 10 x 1) cupstacking skills, instruction and …

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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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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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