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Virtual Teams: An Investigation Of The Determinants Of Team Effectiveness And The Contribution Of Managerial Behavior Control., Gabriele Piccoli
Virtual Teams: An Investigation Of The Determinants Of Team Effectiveness And The Contribution Of Managerial Behavior Control., Gabriele Piccoli
LSU Historical Dissertations and Theses
Information Technology is providing the backbone for development of new organizational forms. Virtual teams represent one such organizational form that has the potential to change the workplace and provide organizations with increased levels of flexibility and responsiveness. Many organizations are recognizing these potential benefits and are implementing virtual teams. A gap exists in the current Information Systems literature. No previous study has looked at the role of managerial control mechanisms in fostering virtual team effectiveness. This study contributes a model of virtual team effectiveness based on an extension of research in traditional environments. The contribution of managerial behavior control practices …
The Design And Construction Of Novel Near -Infrared Time -Correlated Single Photon Counting Devices For The Identification Of Analytes In Multiplexed Applications., Emanuel Austin Waddell Jr
The Design And Construction Of Novel Near -Infrared Time -Correlated Single Photon Counting Devices For The Identification Of Analytes In Multiplexed Applications., Emanuel Austin Waddell Jr
LSU Historical Dissertations and Theses
This manuscript details the design, construction, and application of novel near infrared time correlated single photon counting devices to the identification of analytes in analytical separations. The thrust of this research is to provide a simple, low cost technique for the high-speed identification of DNA sequencing bases that are labeled with a series of unique near infrared fluorophores. These fluorophores are unique because they possess the same emission and absorption maxima, but different fluorescence lifetimes. Consequently, they allow analytes to be discriminated by fluorescence lifetime as opposed to color. The first goal of this dissertation research was to implement a …
Studies In Organized Media: Part I. Characterization And Use Of Polymeric Chiral Surfactants As Pseudo-Stationary Phases For Separation In Capillary Electrophoresis. Part Ii. Use Of Cyclodextrins In Capillary Electrophoresis And In The Formation Of Linear Aggregates., Houphouet Hyacinthe Yarabe
LSU Historical Dissertations and Theses
This research involves the synthesis and characterization of charged chiral polymeric surfactants for their use as pseudostationary phases in electrokinetic chromatography (EKC). Poly sodium N-undecanoyl L-valinate (poly L-SUV), poly sodium N-undecanoyl L-threoninate (poly L-SUT), and poly sodium N-undecanoyl L-isoleucinate (poly L-SUIL) were synthesized in this study. The partial specific volumes of these polymers, determined using a densitometer, were 0.81, 0.77, and 0.83 mL/g, respectively. Molecular weights of 9,984, 11,252 and 10,563 were obtained for poly L-SUV, poly L-SUT and poly L-SUIL, respectively by using sedimentation equilibrium. In addition, sedimentation coefficients of 0.67 and 1.03 S were found for poly L-SUV …
Education As Prison Reform: A Meta -Analysis., Ronald Edward Wells
Education As Prison Reform: A Meta -Analysis., Ronald Edward Wells
LSU Historical Dissertations and Theses
Corrections administrators have long recognized the possibility of education as a method of creating a favorable change in incarcerated individuals. Through education the individual would be encouraged in his/her attempts to succeed within society. However, this feeling has been more of an intuitive notion rather than empirically determined. The goal of this dissertation has been the development of a model of recidivism prediction which could overcome the problems of subjectivity, inaccuracy, and invalidity found in many currently used methods of prediction. This investigation was designed to explore relationships between several educational variables and post-release behavior of criminal offenders. The results …
Computer -Assisted Instruction And Sequencing Within The Studio: A Focus On Halsey Stevens' "Sonata For Trumpet And Piano", Timothy James Zifer
Computer -Assisted Instruction And Sequencing Within The Studio: A Focus On Halsey Stevens' "Sonata For Trumpet And Piano", Timothy James Zifer
LSU Historical Dissertations and Theses
The teaching of solo literature in the context of studio trumpet instruction has always presented personal challenges, especially when that literature includes a variety of mixed meter, subito tempo, and dynamic changes. Consistent aid from a metronome and tuner has for generations facilitated the dedicated musician, yet these devices are obviously limited by the student's dedication, receptivity, and innate talent. I conversely propose that by introducing computer assisted instruction within the confines of the private studio, the students' musical ability will be enhanced as will the pupils' consistent practice regiment. The introductory segment of Chapter 1 provides an extremely truncated …
Diversity And Spatial Analysis Of Passerine Birds In Relation To Habitat Characteristics Of Woods Along The Northern Coast Of The Gulf Of Mexico., Jose Luis Alcantara
Diversity And Spatial Analysis Of Passerine Birds In Relation To Habitat Characteristics Of Woods Along The Northern Coast Of The Gulf Of Mexico., Jose Luis Alcantara
LSU Historical Dissertations and Theses
I studied the ecological diversity and spatial patterns of passerine birds during the springs of 1993, 1994, and 1995 at 3 stopover sites on the Chenier Plains of Louisiana and Texas. A "control" stand with dense understory vegetation and a "reduced" stand with modified understory were at each site. Data were collected on the structure and composition of vegetation and on the abundance and location of birds. Species richness, dominance, and diversity indices were computed for both vegetation and birds. Patterns of floristic impoverishment, greater dominance, and greater plant species diversity were found at the "reduced" stands. "Control" vegetation did …
Habitat Influences On Nongame Bird Nest Success In A Managed And Fragmented Southern Pine Forest., Michael Darren Baker
Habitat Influences On Nongame Bird Nest Success In A Managed And Fragmented Southern Pine Forest., Michael Darren Baker
LSU Historical Dissertations and Theses
We confirmed the breeding-season presence of 52 bird species and assessed the reproductive quality of a fragmented southern pine forest managed for natural resource extraction on Barksdale Air Force Base in northwest Louisiana, USA. We also conducted point counts to assess relative abundance, richness, and diversity among four habitat discontinuity types (timber harvests, pipeline corridors, access roads, and natural gas wells). Each parameter was greater on study plots adjacent to gas wells than on those adjacent to roads. We determined the fate of 817 nests of 42 species between 1996 and 1998 and determined Mayfield daily nest success (MDNS) for …
The Relationship Of Biomass Allocation And Nutrient Dynamics In Loblolly And Slash Pine Forests., Christopher Ashley Dicus
The Relationship Of Biomass Allocation And Nutrient Dynamics In Loblolly And Slash Pine Forests., Christopher Ashley Dicus
LSU Historical Dissertations and Theses
Aboveground biomass allocation and its effect on various aspects of N and P dynamics were investigated in loblolly pine (Pinus taeda L.) and slash pine (Pinus elliottii Engelm.) stands planted at different spacings. Further, the relationship of nutrient demand and root production was investigated to validate the functional balance hypothesis in forest stands. N mineralization was greater in loblolly pine stands than slash pine, corresponding with greater needle litter N concentration. Both N and P mineralization increased in loblolly pine stands with increasing stand density, the result of greater nutrient input through increased litterfall. There were no species differences in …
Structure And Function Studies Of De Novo Peptides Containing Novel Amino Acids., Ted Joseph Gauthier
Structure And Function Studies Of De Novo Peptides Containing Novel Amino Acids., Ted Joseph Gauthier
LSU Historical Dissertations and Theses
A series of amphipathic peptides rich in alpha,alpha-disubstituted amino acids (alphaalphaAA's) was synthesized and studied for antimicrobial activity and helix preferences in various solvent systems. In addition, a constrained lactam dipeptide amino acid was synthesized and incorporated into a peptide to examine beta-sheet dimer formation. Several short, amphipathic, 310- and alpha-helical peptides containing 80% alphaalphaAA's were synthesized using various combinations of 1-aminocyclohexane-1-carboxylic acid, alpha-aminoisobutyric acid, and 4-aminopiperidine-4-carboxylic acid. The peptides showed direct antimicrobial activity against E. coli and S. aureus. In addition, several of the peptides showed in vivo and in vitro activity against Brucella abortus and Mycobacterium chelonei. Studies …
A Narrative Study Of Selected Introductory College Biology Students' Struggles To Gain An Understanding Of Scale And Measurement., Juliana Guillory Hinton
A Narrative Study Of Selected Introductory College Biology Students' Struggles To Gain An Understanding Of Scale And Measurement., Juliana Guillory Hinton
LSU Historical Dissertations and Theses
Case studies, developed with criteria from Yin's Case Study Research: Design and Methods (1994), probed single mental constructs of four introductory college biology students who were recent high school graduates. Data sources included autobiographical essays, interviews, coconstructed concept maps (Wandersee & Abrams, 1993), a videotape questionnaire, and graphics. A multisensory microscopy experiment provided the setting for the construction of shared meanings by the participants. Concept maps were used then to explore the existing cognitive framework of the participants. This research affirmed the value of supporting graphic organizers for understanding science (Good & Berger, 1998; Hyerle, 1996; Trowbridge & Wandersee, 1998). …
A Spatial Inquiry Of Infant Low Birthweight And Cancer Mortality In East Baton Rouge Parish, Louisiana., Esra Ozdenerol
A Spatial Inquiry Of Infant Low Birthweight And Cancer Mortality In East Baton Rouge Parish, Louisiana., Esra Ozdenerol
LSU Historical Dissertations and Theses
Infant low birthweight rate in East Baton Rouge Parish is higher compared to the nation. Cancer is one of the most serious health problems in Louisiana. A few studies have indicated a relationship between the two health outcomes and their environment, but conclusions from these studies have not always been consistent. The spatial and temporal scales of the data and the methods used in these studies contribute to the inconsistent and uncertain results. The spatial patterns of infant low birthweight and cancer mortality in East Baton Rouge Parish from 1993 to 1996 and their relationships with environmental factors at three …
The Effect Of Storage On Consumer Preference, Sugar Content, And Starch Content Of Spiced Low-Fat Sweet Potato Flavored Yogurt., Mohammad Abdulrahman Al-Fayez
The Effect Of Storage On Consumer Preference, Sugar Content, And Starch Content Of Spiced Low-Fat Sweet Potato Flavored Yogurt., Mohammad Abdulrahman Al-Fayez
LSU Historical Dissertations and Theses
The primary purpose of this study was to determine if addition of pumpkin pie spice to sweet potato puree would enhance consumer acceptance of sweet potato flavored yogurt. In Phase I, the effect of fat percentage, spice percentage, and addition of sweet potato pre-fermentation and post-fermentation on consumer acceptance was examined to determine the optimum treatment preferred by consumers and the effect of each treatment variable on the fermentation process. Phase II focused on the effect of storage periods of 7, 14, and 21 days on the organoleptic qualities and chemical composition of sweet potato. Analyses showed that the percentage …
Study Of The Energy Spectrum Of Solar Neutrinos Above 5.5 Mev., Erik Karl Blaufuss
Study Of The Energy Spectrum Of Solar Neutrinos Above 5.5 Mev., Erik Karl Blaufuss
LSU Historical Dissertations and Theses
Data collected at the Super-Kamiokande detector have been used to make observations of the flux and spectrum of neutrinos that originate in the fusion reactions inside the center of the Sun. Previous observations of solar neutrinos have resulted in fluxes that are one third to one half the values predicted by solar models, a situation that has been labeled "the solar neutrino problem". The phenomena of neutrino oscillations is investigated as a possible solution to this problem. The Super-Kamiokande detector, located in Gifu, Japan, is a ring-imaging Cherenkov detector that detects the scattered electrons from neutrino-electron elastic scattering in the …
Understanding The Biological Concept "Bird": A Kindergarten Case Study., Dilek Buchholz
Understanding The Biological Concept "Bird": A Kindergarten Case Study., Dilek Buchholz
LSU Historical Dissertations and Theses
The purpose of this qualitative, multiple case study of 14 students in a metropolitan public school in the Deep South was to find out, during a period of three months, what these kindergarten-aged children knew about birds, whether this knowledge represented current scientific thought, if such science instruction meaningfully affected their prior knowledge, and if so, what the factors during instruction that seemed to influence their understanding of the concept of bird were. The research was conducted in three phases; preinstruction interviews, instruction, and postinstruction interviews. The theoretical framework for this research was based on the Human Constructivism theory of …
Efficient Checkpointing For Heterogeneous Collaborative Environments: Representation, Coordination, And Automation., Kasidit Chanchio
Efficient Checkpointing For Heterogeneous Collaborative Environments: Representation, Coordination, And Automation., Kasidit Chanchio
LSU Historical Dissertations and Theses
Checkpointing can be used to adapt resource utilization in heterogeneous distributed environments. In checkpointing, the state of a process is captured and later restored on a computer to restart execution from the point where the state capturing had occurred. Such capability can be applied to process migration for which resource utilization is adapted toward high-performance by moving a running process from one computer to another. For a heterogeneous environment, problems in checkpointing can be categorized into three domains regarding mechanisms to capture and restore the execution state, memory state, and communication state of a process. Although a few solutions have …
A Case Study In Amazonian Biogeography: Vocal And Dna -Sequence Variation In Hemitriccus Flycatchers., Mario Cohn-Haft
A Case Study In Amazonian Biogeography: Vocal And Dna -Sequence Variation In Hemitriccus Flycatchers., Mario Cohn-Haft
LSU Historical Dissertations and Theses
Ongoing debate about the evolutionary history of the Amazonian avifauna suffers from a shortage of data. Especially needed are thorough geographic sampling, sensitive markers of genetic diversity, and historical data in the form of explicit phylogenies. I examined patterns of geographic variation in three widespread species complexes of nearly identical Amazonian flycatchers in the genus Hemitriccus, based on spectrographic analysis of vocalizations and phylogenetic analysis of DNA sequences (1026 base pairs of cytochrome b from 44 individuals) from throughout Amazonia. Although members of the three complexes are extremely difficult to distinguish morphologically and have long been confused by taxonomists, they …
Molecular Systematics And Historical Biogeography Of The Tree Shrews (Tupaiidae)., Kwai Hin Han
Molecular Systematics And Historical Biogeography Of The Tree Shrews (Tupaiidae)., Kwai Hin Han
LSU Historical Dissertations and Theses
This dissertation examined the molecular systematics and historical biogeography of tree shrews (Tupaiidae). Comparison of cytochrome b sequences and DNA hybridization data suggests that cytochrome b sequences evolved 7.9 to 13.4 times faster than single-copy nuclear DNA. These two data sets are taxonomically congruent. They indicate that the Mindanao tupaiid Urogale everetti is a member of Tupaia, and that there is lineage-based variation in rates of evolution among the tupaiids. A new species of Tupaia from Sarawak (Malaysia), T. stuebingi, was described using morphological, ecological, and cytochrome b sequence data. This lowland species is generally similar in size to the …
Factors Influencing The Decision To Transfer As Perceived By Students Currently Enrolled In A Four -Year University Who Have Transferred From Another Four -Year University., Brenda Griffin Hanson
Factors Influencing The Decision To Transfer As Perceived By Students Currently Enrolled In A Four -Year University Who Have Transferred From Another Four -Year University., Brenda Griffin Hanson
LSU Historical Dissertations and Theses
The purpose of this study is to identify and describe selected perceptual, academic, and personal demographic characteristics of transfer students that transfer from four-year to four-year institutions to facilitate implementation of policies, intervention procedures for retention, and recruitment. The population was students currently enrolled in one public funded, Carnegie Class Masters-II, four-year university in the southern region of the United States who have transferred from another four-year institution within the previous year. Data for the study was collected as part of a two-stage process, and includes both primary and secondary information. Primary data collection was the information provided by the …
Workplace Whining: Antecedents And Process Of Noninstrumental Complaining., Anita Konieczka Heck
Workplace Whining: Antecedents And Process Of Noninstrumental Complaining., Anita Konieczka Heck
LSU Historical Dissertations and Theses
The purpose of this dissertation was to develop a conceptual scheme that advances understanding of workplace whining. It reports an investigation into eight theoretically relevant antecedents to workplace whining, classified into four categories (i.e., dispositional, attitudinal, relational, behavioral). Additionally, it explores the role of organization-based self-esteem in mediating the link between each antecedent and workplace whining. Kowalski's (1996) theory of complaining and self-esteem theory (Coopersmith, 1967, Epstein, 1973; Jones, 1973; Leary & Downs, 1995, Mruk, 1995; Pierce et al., 1989) provided the primary theoretical underpinnings for a series of hypothesized relationships. Data on 471 schoolteachers and their immediate supervisors from …
A Methodology To Support The Maintenance Of Object -Oriented Systems Using Impact Analysis., Michael Alan Hoffman
A Methodology To Support The Maintenance Of Object -Oriented Systems Using Impact Analysis., Michael Alan Hoffman
LSU Historical Dissertations and Theses
Object-Oriented (OO) systems are difficult to understand due to the complex nature of the relationships that object-orientation supports. Inheritance, polymorphism, encapsulation, information hiding, aggregation, and association combine to make maintenance of OO systems difficult. Due to the presence of these characteristics in OO systems, maintenance activities on OO systems often have unexpected or unseen effects on the system. These effects can ripple through system components, complicating maintenance and testing of the system. The ability to trace the effects of maintenance provides the maintainer with knowledge that assists in debugging and testing modified and affected components. In this research, we show …
Floral Ontogeny And Phylogeny In Malvaceae., Teresa Shuff Crozier
Floral Ontogeny And Phylogeny In Malvaceae., Teresa Shuff Crozier
LSU Historical Dissertations and Theses
Floral ontogeny in representatives of Malvaceae was compared using scanning electron microscopy. Many aspects of floral development have been resolved by this research, including the presence of a petal-stamen ring meristem in malvaceous taxa. There are several ontogenetic pathways to the formation of this ring meristem; in addition, common petal-stamen mounds are usually present during some stage of development. Stamen proliferation is achieved by partitioning of the ring meristem and furcation of common stamen primordia. Time of initiation overlaps between the corolla and the androecium, and between the androecium and the gynoecium. Helical initiation occurs in the outer organ whorl …
The Effect Of Phytase On Nutrient Availability In Diets For Swine And Poultry., Sara Leann Johnston
The Effect Of Phytase On Nutrient Availability In Diets For Swine And Poultry., Sara Leann Johnston
LSU Historical Dissertations and Theses
A series of experiments was conducted to determine the effect of increasing phytase coefficient of variation (CV) in chick diets, and to determine the effect of phytase addition on nutrient availability in diets for swine and poultry. The first experiment (EXP) simulated varying mix uniformity of phytase by alternately providing two diets with two different concentrations of microbial phytase (FTU). Increasing phytase CV had little effect on growth performance, whereas bone ash and breaking strength and Ca and P retention and excretion decreased only at the most extreme CV. These data suggest that a phytase CV of between 34 and …
Tetraarylboronic Acid Resorcinarenes: Synthesis, Molecular Recognition, And Templates For The Construction Of Three-Dimensional Electronic Organic Materials., Patrick Tyrone Lewis
Tetraarylboronic Acid Resorcinarenes: Synthesis, Molecular Recognition, And Templates For The Construction Of Three-Dimensional Electronic Organic Materials., Patrick Tyrone Lewis
LSU Historical Dissertations and Theses
The resorcinarenes are remarkable cyclic aromatic tetramers whose impressive impact in the disciplines of molecular recognition, materials science and supramolecular chemistry has been the subject of extensive study and recent review. The potential utility of these materials as chemosensors, catalysts, energy storage and drug delivery agents has been studied or proposed. Research involving resorcinarene molecular containers (careceplexes, carecerands, hemicarcerands) has resulted in landmark achievements including the stabilization of encapusulated cyclobutadiene and benzyne. Functionalization of the resorcinarene lower rim has begun to attract attention as a means to enhance the properties of the parent macrocycles. There has been only one report …
Crystal Structures Of Various Organic Materials And A Statistical Analysis Of Single Crystal X -Ray Diffraction Data From Potassium -Doped Barium Plumbate., Jerome Gerard May
Crystal Structures Of Various Organic Materials And A Statistical Analysis Of Single Crystal X -Ray Diffraction Data From Potassium -Doped Barium Plumbate., Jerome Gerard May
LSU Historical Dissertations and Theses
A general explanation of the collection and reduction of crystallographic data is presented. This is followed by a brief explanation of routine crystal structure solution and refinement. The results of five routine organic structure solutions are included. A discussion of the perovskite structure aristotype is followed by an elaboration of four common distortions to the aristotype that result in perovskite hettotypes. A crystal structure for barium bismuthate is analyzed to explain its occurrence as a perovskite aristotype. A literature review of powder and neutron diffraction structures reported for barium plumbate included a wide variety of perovskite hettotypes and one aristotype. …
Hydrodynamics, Bottom Boundary Layer Processes And Sediment Transport On The South-Central Louisiana Inner Shelf: The Influence Of Extratropical Storms And Bathymetric Modification., David Alton Pepper
LSU Historical Dissertations and Theses
The south-central Louisiana inner shelf has several distinctive characteristics that are not well accounted for by common hydrodynamic and sediment transport models, including a high-frequency wave regime, low fair-weather hydrodynamic energy levels, a coastal orientation parallel to most storm approaches, and a prominent submerged sand body (Ship Shoal). To address these unique considerations, inner-shelf processes were studied using three instrumentation systems deployed on the seaward and landward sides of the shoal between November, 1998 and January, 1999. These instruments were designed to measure hydrodynamic characteristics, suspended sediment concentration, and bed level, which were used to calculate bottom boundary layer parameters …
Effects Of A Low -Protein Diet Supplemented With Coated And Uncoated Methionine On Methionine Metabolism In The Tilapia Oreochromis Niloticus., Manuel Alberto Segovia-Quintero
Effects Of A Low -Protein Diet Supplemented With Coated And Uncoated Methionine On Methionine Metabolism In The Tilapia Oreochromis Niloticus., Manuel Alberto Segovia-Quintero
LSU Historical Dissertations and Theses
Crude protein is the most expensive macronutrient, the use of plant proteins and crystalline amino acid supplementation is the next logical step to increase nutritional value of plant-based diets. The goal of this experiment was to determine the effect of coated and uncoated crystalline methionine on growth, body composition, and methionine uptake in Nile tilapia Oreochromis niloticus fed methionine supplements. Two experiments were designed for this purpose: one to study the effect of supplementation on weight gain and body composition, and a second to determine the effect of coating on absorption efficiency and utilization of crystalline methionine. Five isonitrogenous (26% …
Evaluating Alternative Instructional Strategies To Improve Sixth Graders' Reading Comprehension., Emma Mccall Schorzman
Evaluating Alternative Instructional Strategies To Improve Sixth Graders' Reading Comprehension., Emma Mccall Schorzman
LSU Historical Dissertations and Theses
Although little empirical evidence supporting various instructional strategies for teaching reading comprehension exists, many educators utilize particular strategies assuming their effectiveness. Because difficulties with comprehension are intensified as students reach the intermediate grades, it is necessary that middle school educators instruct using strategies empirically supported through research. This mixed-method study examined the effectiveness of the Directed Reading-Thinking Activity (Stauffer, 1969), the PreP technique (Langer, 1981), and graphic organizers (Barron, 1969), three popular strategies among middle school teachers. Six teachers participated in the two-group design, pretest/posttest study; over a seven-week period, three of the teachers instructed their sixth-grade students using lessons …
An Inquiry Into The Impact Of The Regrow Reading /Writing Strategy On Comprehension In A Community College Setting., Angel Michele Royal
An Inquiry Into The Impact Of The Regrow Reading /Writing Strategy On Comprehension In A Community College Setting., Angel Michele Royal
LSU Historical Dissertations and Theses
The purpose of this study was to examine the impact of the REGROW reading/writing strategy on the comprehension of community college students enrolled in a Developmental English course. The study looked specifically at (a) reading and writing as processes, (b) traditional reading comprehension strategies, (c) traditional direct writing instruction, and (d) the impact of the REGROW reading/writing strategy on comprehension. The focus of this study was to conduct six mini-case studies on students classified as below average, average, and above average, and to track their actions when exposed to direct writing instruction and the REGROW reading/writing strategy. By providing in-depth …
Non -Intrusive Characterization Of A Dispersed, Bubbly, Axisymmetric Jet., Kevin Nathaniel Stanley
Non -Intrusive Characterization Of A Dispersed, Bubbly, Axisymmetric Jet., Kevin Nathaniel Stanley
LSU Historical Dissertations and Theses
This study investigated the effects of bubble size and phase distribution on the liquid and bubble flow fields in a dispersed, bubbly axisymmetric jet. Of primary interest was the interaction of the bubbles with large-scale structures in the developing region of the jet. Measurements were made non-intrusively via Laser Doppler Velocimetry (LDV), Phase-Doppler Analysis (PDA) and video imaging techniques. Liquid Reynolds' numbers were varied from approximately 6,000 to 18,000 while gas volume fraction ranged from 0 to 3%. Bubble sizes varied from approximately 600 mum to 1500 mum. Axial mean velocities and RMS fluctuations have been reported for the liquid …
Structure Determination Of Derivatized Disaccharides By Tandem Mass Spectrometry And Molecular Modeling., Sanford Louis Mendonca
Structure Determination Of Derivatized Disaccharides By Tandem Mass Spectrometry And Molecular Modeling., Sanford Louis Mendonca
LSU Historical Dissertations and Theses
This research entails the synthesis of derivatized disaccharides, mass spectrometry studies for structural elucidation of the synthetic disaccharides and molecular modeling of the native and derivatized disaccharides. Peralkylated (methyl to pentyl), peresterifed and tert-butyl-dimethyl silylated linkage isomeric glucose-glucose disaccharides were synthesized to eventually be used in mass spectrometry studies. In this dissertation, mass spectrometry was used to examine anomeric pair discrimination of two sets of peralkylated (methyl to pentyl) disaccharides (maltose/cellobiose and isomaltose/gentiobiose). This was carried out by electrospray ionization and collision experiments on a triple quadrupole mass spectrometer. In addition, effects of alkyl substitution on cleavage of the glycosidic …