Digital Commons Network^™

The Association Between Tea Consumption And Hyperhomocysteine In Chinese Hypertensive Patients, Jun Zhu, Wei Wang, Yaqing Xiong, Richard S. Cooper, Ramon Du Raza-Arvizu, Guichan Cao, Yi Wang, Peng Ji, Rongwen Bian, Jiaren Xu

Faculty Publications

BACKGROUND There is no consistent evidence for the relationship between tea-drinking and hyperhomocysteine (hHcy). Because tea-drinking habit and hHcy have prevailed in Chinese hypertensive patients, this study aimed to investigate the association between hHcy and tea consumption in patients with hypertension. METHODS A total of 335 hypertensive participants were recruited from 7 communities. Demographic characteristics of participants were collected through face-to-face interviews using a standard questionnaire, whereas laboratory data were obtained within 1 week after patient recruitment. Multiple logistic regression analysis was performed to examine the association between tea consumption and hHcy in hypertensive patients. RESULTS Of the 335 patients, …

Ignition And Extinction Behavior Of Fuels In A Microcombustor, Pawan Sharma

LSU Doctoral Dissertations

Conventional fuel testing device-CFR engine requires large quantities of fuels, which makes it unsuitable for research of small samples of fuels. This current study seeks to address this limitation by using an externally heated microcombustor as an alternative fuel testing device. Mainly three combustion behaviors have been observed inside a microcombustor: strong flames at higher flow rates, Flames with Repetitive Extinction and Ignition (FREI) at intermediate flow rates, and weak flames at marginal flow rates. In previous studies, weak combustion behavior has been proven suitable to study fuel properties from small samples of fuels. Microcombustor experiments typically rely on flame …

An Airlifted Tidal Mesocosm For Oil Degradation Studies, Daniel Christopher Alt

LSU Doctoral Dissertations

Mesocosms were constructed to allow scientists to isolate variables in a microtidal marsh environment, mimicking the natural conditions found in Terrebonne Bay. The control offered by these mesocosms is given by a process control system that takes user inputs and automates water movement. Twelve mesocosms were constructed, each holding 4.02 m³ (142 ft³) of marsh soil and 3.88 m³ (137 ft³) of water to give 3 experimental levels and a control, all in triplicate.

Each mesocosms that was constructed contained marsh plants in soil plugs 9 feet in diameter and 3 feet deep. These …

Composition And Ecology Of Avian Communities Along Elevational Gradients In Borneo, Ryan Christian Burner

LSU Doctoral Dissertations

A primary goal of ecology is to explain the diversity and distribution of organisms. Species distributions can be a function of abiotic factors, species interactions, dispersal limitations, and history, but the relative importance of these factors is widely debated. Elevational gradients are useful systems for studying these effects because many of these factors vary predictably with elevation, and because elevational gradients are replicated many times across the earth. However, few quantitative surveys of Southeast Asian bird communities have been conducted along elevational gradients. In this study, I surveyed birds using point counts and measured habitat and temperature across primary forest …

Diy In Early Live Electroacoustic Music: John Cage, Gordon Mumma, David Tudor, And The Migration Of Live Electronics From The Studio To Performance, Lindsey Elizabeth Hartman

LSU Doctoral Dissertations

This research examines early live electronic works by Gordon Mumma, David Tudor, and John Cage—three influential American experimental music composers who designed, built, and recontextualized electronics for live performance—and the Do-It-Yourself (DIY) aesthetic embodied by their instruments and the compositions written for them. This dissertation serves as a presentation of original research into the earliest composers of live electronic works and the necessary DIY approach used in building independent systems. Previous research on the DIY perspectives in music often touch on the grass-roots nature of contemporary electroacoustic systems but there is not yet research specific to the DIY approach taken …

High-Throughput Cultivation Of Bacterioplankton From The Gulf Of Mexico And Genomics Of The First Cultured Ld12 Representative, Michael Winslow Henson

LSU Doctoral Dissertations

Cultivation of microorganisms facilitates characterization of metabolism, interspecies dependencies, virus-host interactions, and other information necessary to resolve the functions and distribution of individual taxa. However, the metabolic and physiological capacities for the majority of microbes remains unresolved because of the lack of cultivated representatives for many groups limits our ability to test cultivation-independent observations. The Northern Gulf of Mexico offers a diversity of ecosystems under the continuous threat from natural and anthropogenic disturbances, yet little is known about its native bacterioplankton community. This dissertation sought to use high-throughput cultivation over three-years at six sites to isolate important coastal bacteria to …

A Multi-Proxy Approach To Refining Paleotempestology Records On The Northern Gulf Of Mexico Coast, Marianne Elizabeth Dietz

LSU Doctoral Dissertations

Reconstructing pre-historic hurricane activity is typically accomplished through the analysis of sandy overwash deposits identified in coastal lake settings. This method has been used successfully in many parts of the world and can extend the hurricane record thousands of years into the past. However, this approach also has its limitations. This dissertation addresses some of the limitations associated with geologic proxies used to reconstruct hurricane landfalls in the absence of historic data and tests new proxies for the identification of hurricane-derived overwash deposits. Modern storm deposits from two sites on the northern Gulf of Mexico coast are analyzed in detail …

Experimentally Examining The Proposed Relationships Among “Rehearsal-Based” Effects, Corey Ian Mcgill

LSU Doctoral Dissertations

Despite the importance of rehearsal to most models of verbal working memory, its role has been recently called into question. Much prior work in support of rehearsal models has centered on the experimental effects of word-length, phonological-similarity, and irrelevant sound on serial order recall performance and the interaction of all three with concurrent articulation. However, recent research has suggested that confounding effects of stimuli, such as orthographic neighborhood, may be the true cause of the word-length effect. While these findings alone have significant implications for modern models of rehearsal, to understand them within the context of modern theories of working …

Search For Multimessenger Sources Of Gravitational Waves And High-Energy Neutrinos With Advanced Ligo During Its First Observing Run, Antares, And Icecube, A. Albert, M. André, M. Anghinolfi, M. Ardid, J. J. Aubert, J. Aublin, T. Avgitas, B. Baret, J. Barrios-Martí, S. Basa, B. Belhorma, V. Bertin, S. Biagi, R. Bormuth, J. Boumaaza, S. Bourret, M. C. Bouwhuis, H. Brânzaş, R. Bruijn, J. Brunner, J. Busto, A. Capone, L. Caramete, J. Carr, S. Celli, M. Chabab, R. Cherkaoui El Moursli, T. Chiarusi, M. Circella, J. A.B. Coelho, A. Coleiro, M. Colomer, R. Coniglione

Faculty Publications

Astrophysical sources of gravitational waves, such as binary neutron star and black hole mergers or core-collapse supernovae, can drive relativistic outflows, giving rise to non-thermal high-energy emission. High-energy neutrinos are signatures of such outflows. The detection of gravitational waves and high-energy neutrinos from common sources could help establish the connection between the dynamics of the progenitor and the properties of the outflow. We searched for associated emission of gravitational waves and high-energy neutrinos from astrophysical transients with minimal assumptions using data from Advanced LIGO from its first observing run O1, and data from the Antares and IceCube neutrino observatories from …

The Interplay Among Tax Specialists, Corporate Tax Behavior, And Tax Accrual Quality, Pradeep Sapkota

LSU Doctoral Dissertations

Do tax specialists improve the accrual quality of tax accounts while simultaneously lowering effective tax rates (ETR)? Tax specialists are associated with lower ETRs. Since prior research finds that companies with lower ETRs are associated with lower financial reporting quality, companies that employ tax specialists may have lower tax accrual quality (TAQ). However, the potential for knowledge spillover and specialization effects suggests that tax specialists may simultaneously lower ETRs and improve TAQ. Thus, tax specialists can have an interesting influence on the joint effect with low ETRs on TAQ. I find that companies with lower ETRs are associated with lower …

Atomic Force Microscopy Tip-Enhanced Laser Ablation, Fan Cao

LSU Doctoral Dissertations

In the present work, an apertureless atomic force microscope (AFM) tip-enhanced laser ablation (TELA) system was developed and investigated. An AFM was coupled to an optical parametric oscillator (OPO) wavelength tunable laser for sample ablation with a submicron sampling size. The AFM was used to image the surface and hold the AFM tip 10 nm above the sample surface. The AFM tip is coated with a layer of gold with a thickness of 35 nm. The incident laser wavelength was tuned in the visible and near-infrared (IR) region and focused on the AFM tip. With the tip-enhancement effect, ablation craters …

Biomolecular Processing Platform And Uses Thereof, Steven A. Soper, Francis Barany, George Grills, Robin L. Mccarley, Collin J. Mckinney, Dorel Moldovan, Michael C. Murphy, Dimitris E. Nikitopoulos, Sunggook Park, Elizabeth J. Podlaha-Murphy

College of Science Patents

No abstract provided.

Etoxpred: A Machine Learning-Based Approach To Estimate The Toxicity Of Drug Candidates 11 Medical And Health Sciences 1115 Pharmacology And Pharmaceutical Sciences 03 Chemical Sciences 0305 Organic Chemistry 03 Chemical Sciences 0304 Medicinal And Biomolecular Chemistry, Limeng Pu, Misagh Naderi, Tairan Liu, Hsiao Chun Wu, Supratik Mukhopadhyay, Michal Brylinski

Faculty Publications

© 2019 The Author(s). Background: The efficiency of drug development defined as a number of successfully launched new pharmaceuticals normalized by financial investments has significantly declined. Nonetheless, recent advances in high-throughput experimental techniques and computational modeling promise reductions in the costs and development times required to bring new drugs to market. The prediction of toxicity of drug candidates is one of the important components of modern drug discovery. Results: In this work, we describe eToxPred, a new approach to reliably estimate the toxicity and synthetic accessibility of small organic compounds. eToxPred employs machine learning algorithms trained on molecular fingerprints to …

Changes In Composition And Lead Speciation Due To Water Washing Of Air Pollution Control Residue From Municipal Waste Incineration, A. A. Bogush, J. A. Stegemann, A. Roy

Faculty Publications

Changes in elemental and mineralogical composition, and lead speciation, of air pollution control residue (APCR) from municipal solid waste incineration, due to treatment by water washing, were investigated in this work and are reported in the context of a review of the literature. Water washing was shown to substantially modify the nature of APCR by: 1) removing 23% dry mass soluble salts to disagglomerate particles and significantly reduce concentrations of the associated major elements, and increase concentrations of insoluble matrix elements and potential pollutants; and 2) respeciating elements to form new phases. X-ray absorption near edge spectroscopy (XANES) showed that …

Changes In Composition And Lead Speciation Due To Water Washing Of Air Pollution Control Residue From Municipal Waste Incineration, A. A. Bogush, J. A. Stegemann, A. Roy

Faculty Publications

Changes in elemental and mineralogical composition, and lead speciation, of air pollution control residue (APCR) from municipal solid waste incineration, due to treatment by water washing, were investigated in this work and are reported in the context of a review of the literature. Water washing was shown to substantially modify the nature of APCR by: 1) removing 23% dry mass soluble salts to disagglomerate particles and significantly reduce concentrations of the associated major elements, and increase concentrations of insoluble matrix elements and potential pollutants; and 2) respeciating elements to form new phases. X-ray absorption near edge spectroscopy (XANES) showed that …

Synthetic Glycolate Metabolism Pathways Stimulate Crop Growth And Productivity In The Field, Paul F. South, Amanda P. Cavanagh, Helen W. Liu, Donald R. Ort

Faculty Publications

y © The Authors, some rights reserved Photorespiration is required in C3 plants to metabolize toxic glycolate formed when ribulose-1,5-bisphosphate carboxylase-oxygenase oxygenates rather than carboxylates ribulose-1,5-bisphosphate. Depending on growing temperatures, photorespiration can reduce yields by 20 to 50% in C3 crops. Inspired by earlier work, we installed into tobacco chloroplasts synthetic glycolate metabolic pathways that are thought to be more efficient than the native pathway. Flux through the synthetic pathways was maximized by inhibiting glycolate export from the chloroplast. The synthetic pathways tested improved photosynthetic quantum yield by 20%. Numerous homozygous transgenic lines increased biomass productivity by >40% in replicated …

Consistify: Preserving Correctness And Sla Under Weak Consistency, Subhajit Sidhanta, Supratik Mukhopadhyay, Wojciech Golab

Faculty Publications

While executing a client application, comprising a sequence of one or more storage operations (read, write, etc.), replicated datastores provide the option of tuning per-operation client-centric consistency settings, Weaker consistency settings allow client applications to execute with lower observed latency due to less coordination among the replica, improving throughput. To enable a client application running on a geo-replicated datastore to meet stringent SLA (Service Level Agreement) deadlines, i.e., latency thresholds provided in the SLA, users apply weak client-centric consistency settings. Strong consistency settings may result in higher latency due to coordination among greater number of replicas. However, since a weak …

Trophodynamics And Mercury Bioaccumulation In Reef And Open-Ocean Fishes From The Bahamas With A Focus On Two Teleost Predators, Oliver N. Shipley, Cheng Shiuan Lee, Nicholas S. Fisher, Georgiana Burruss, Michael G. Frisk, Edward J. Brooks, Zachary C. Zuckerman, Achim D. Herrmann, Daniel J. Madigan

Faculty Publications

© Inter-Research 2019. Identifying prey resource pools supporting fish biomass can elucidate trophic pathways of pollutant bioaccumulation. We used multiple chemical tracers (carbon [δ 13 C] and nitrogen [δ 15 N] stable isotopes and total mercury [THg]) to identify trophic pathways and measure contaminant loading in upper trophic level fishes residing at a reef and open-ocean interface near Eleuthera in the Exuma Sound, The Bahamas. We focused predominantly on the trophic pathways of mercury bioaccumulation in dolphinfish Coryphaena hippurus and wahoo Acanthocybium solandri, 2 commonly consumed pelagic sportfish in the region. Despite residing within close proximity to productive and extensive …

Ukrainian Folklore Influences In The Music Of Myroslav Skoryk: Historical Background And Performance Guide To Selected Violin Works, Iuliia Alyeksyeyeva

LSU Doctoral Dissertations

Myroslav Skoryk is one of the most influential Ukrainian composers of the twentieth and twenty-first centuries. His works draw extensively on the folk traditions of Ukraine to evoke various aspects of the country’s cultural legacy.

The violin holds a special place in the cultural, societal, and historical heritage of Ukraine. Skoryk’s works for violin draw on both Ukrainian folk traditions as well as classical performance traditions. The intricacies of Skoryk’s folk-inspired classical pieces of music are rooted in the oral traditions of Ukrainian folk music.

This document provides background information on certain Ukrainian folk music traditions and their connection to …

Investigations Into Aspergillus Flavus Infection Of Corn And Regulation Of Aflatoxin Production By Volatiles And Biocontrol Strains, Rebecca R. Sweany

LSU Doctoral Dissertations

Aspergillus flavus is an ascomycete fungus impacting agriculture, public and environmental health due to production of acutely-toxic, carcinogenic aflatoxins in oil seed crops, especially corn in Louisiana, and lung infections of immunocompromised patients resulting in a leading cause of AIDS patients’ deaths globally. The most effective aflatoxin mitigation strategy, biocontrol by atoxigenic A. flavus presents several concerns including: dissemination of a human pathogen, possible sexual reproduction and reliance on precise environmental conditions. Several aspects of A. flavus biology were investigated to potentially improve treatments. Studies investigated how genotypically diverse members within the A. flavus population interact with other population members …

Toward The Impact Of Particulate Matter On Human Health: Evaluation Of Fluorescent Environmentally Persistent Free Radical (Epfr) Surrogates, Ansonia Badgett

LSU Doctoral Dissertations

Environmentally persistent free radicals (EPFRs)—a newly discovered pollutant associated with particulate matter (PM)—form during combustion and thermal processes, such as the incineration of hazardous waste. Various chlorine- and hydroxy-substituted benzenes chemisorb on the surface of metal oxides (e.g., NiO, CuO, and Fe₂O₃) and then form EPFRs, stabilized radical species, as the result of the transfer of electrons between the adsorbate and the metal ion of the metal oxide. Previous studies have shown direct correlations between ultra-fine (d < 0.1 mm) particulate matter (PM_0.1) exposure and adverse pulmonary health effects. PM_0.1 has the potential …

Photo-Induced Remote C-H Functionalization And New Thioglycoside Donor Development For O-Glycosylation, Shaofu Du

LSU Doctoral Dissertations

This dissertation focuses on the method development of C-H functionalization using photo-redox catalysis and the synthesis of new thioglycoside donors towards O-glycosylation. Chapter 1 describes the remote Csp³-H functionalization using photo-redox catalysis. The site-selective and high-yielding conversion of unreactive aliphatic C-H bonds has been a challenge for organic chemists for many years. In this work, inert C-H bonds were successfully converted to more useful C-C, C-N, and C-O bonds via hydrogen atom transfer (HAT), radical translocation and polar crossover. This mechanistic manifold was enacted by visible-light irradiation of o-diazoniaphenyl alkyl sulfones in the presence of Ru(bpy) …

Sensitivity Of Evacuation Time Estimation To Modeling Parameter Adjustment, Nelida Andreina Herrera

LSU Doctoral Dissertations

Over the past 40 years, a range of tools and techniques have been employed to assess traffic and travel conditions associated with evacuation events. These tools provide key insights into the temporal-spatial conditions of traffic during an evacuation. The representation of an evacuation in a traffic simulation model requires a number of assumptions about the input and modeling parameters needed to capture relevant aspects of such event. Therefore, a key aspect to ensure appropriate estimations of evacuation clearance times and overall efficacy of emergency planning is to better understand the influence and the importance that simulation modeling parameters have on …

A Critical Edition Of The Bachianas Brasileiras Nº2 For Piano And Cello By Heitor Villa-Lobos, Henrique Borges Gomes

LSU Doctoral Dissertations

The Brazilian composer Heitor Villa-Lobos (1887-1959) is one of the most prominent names in Twentieth century music. His compositional scope encompasses languages that often combine national elements of Brazilian music with traditions of European music. Villa-Lobos’s Bachianas Brasileiras is one of the most representative works that reflect the dialogue of those distinct worlds. With this series of distinct pieces, Villa-Lobos aimed to achieve musical universality through incorporating elements of Bach’s music with that of his own, which was already permeated by Brazilian popular traditions.

This research focusses on the four movements of the “reduced” version of the Bachianas Brasileiras no.2 …

Properties Of The Binary Neutron Star Merger Gw170817, B. P. Abbott, R. Abbott, T. D. Abbott, F. Acernese, K. Ackley, C. Adams, T. Adams, P. Addesso, R. X. Adhikari, V. B. Adya, C. Affeldt, B. Agarwal, M. Agathos, K. Agatsuma, N. Aggarwal, O. D. Aguiar, L. Aiello, A. Ain, P. Ajith, B. Allen, G. Allen, A. Allocca, M. A. Aloy, P. A. Altin, A. Amato, A. Ananyeva, S. B. Anderson, W. G. Anderson, S. V. Angelova, S. Antier, S. Appert, K. Arai, M. C. Araya

Faculty Publications

On August 17, 2017, the Advanced LIGO and Advanced Virgo gravitational-wave detectors observed a low-mass compact binary inspiral. The initial sky localization of the source of the gravitational-wave signal, GW170817, allowed electromagnetic observatories to identify NGC 4993 as the host galaxy. In this work, we improve initial estimates of the binary's properties, including component masses, spins, and tidal parameters, using the known source location, improved modeling, and recalibrated Virgo data. We extend the range of gravitational-wave frequencies considered down to 23 Hz, compared to 30 Hz in the initial analysis. We also compare results inferred using several signal models, which …

Effect Of Different Traffic Signal Control Plans On Simulation Of Hurricane Evacuation Traffic, Divya Kolasani

LSU Master's Theses

The majority of hurricane evacuation modeling studies concentrate on evacuation traffic on freeways with relatively little attention being given to traffic on arterials. This study is focused on evaluating the evacuation efficiency of a network under different traffic signal settings on arterials using microscopic simulation. This is achieved by changing the traffic signal settings from existing signal timing plans to flashing yellow on major evacuation routes and flashing red on cross streets, for a given evacuation order. Time-dependent origin-destination matrices for hurricane evacuation up to 72 hours away from landfall for No Evacuation order, as well as a Voluntary/Mandatory Evacuation …

Design And Optimization Of An Ionizing-Radiation-Free Dental Imaging Scheme By Near Infrared Fluorescence, Thomas Hartzler

LSU Master's Theses

There is a global need for access to oral health care. Proper oral health care is necessary for physiological and psychological health, as well as social and economic issues. Major oral diseases that must be screened include caries, cracked teeth, and impacted molars. These diseases are screened and diagnosed using a variety of medical imaging methods, computed tomography (CT) X-ray being the most popular and efficient method. The challenges in screening with X-ray technology include financial and time cost as well as health risk, including radiation exposure induced cancer (REIC). This thesis summarizes research to explore the possibility of overcoming …

The Influence Of Selected Factors On The Perceived Work Readiness Of Undergraduate Program Completers At A Research University, Karen Lynne Goodridge

LSU Doctoral Dissertations

The primary purpose of this study was to determine the influence of selected personal, academic, and employment characteristics on the perceived work readiness of undergraduate program completers at a research university located in the Southern Region of the United States. The target population was undergraduate program completers at research universities in the United States. The accessible population was undergraduate program completers at one selected research university (RU/VH) located in the Southern Region of the United States. The sample comprised 100% of the defined accessible population who completed a graduating student survey administered by the Office of Career Services (OCS) at …

Effects Of Shoal Margin Collapses On The Morphodynamics Of A Sandy Estuary, M. R. Hiatt

Faculty Publications

Shoal margin collapses of several million cubic meters have occurred in the Western Scheldt estuary, the Netherlands, on average five times a year over the last decades. While these collapses involve significant volumes of material, their effect on the channel-shoal morphology is unknown. We hypothesize that collapses dynamicize the channel-shoal interactions, which could impact the ecological functioning, flood safety, and navigation in the estuary. The objective is to investigate how locations, probability, type, and volume of shoal margin collapse affect the channel-shoal dynamics. We implemented an empirically validated parameterization for shoal margin collapses and tested its effect on simulated estuary …

Supporting Spartina: Interdisciplinary Perspective Shows Spartina As A Distinct Solid Genus, A Bortolus, P Adam, J B. Adams, M L. Ainouche, A Bortolus, M D. Bertness, T J. Bouma, J F. Bruno, I Cacador, J T. Carlton, J M. Castillo, C S. Costa, A J. Davy, L Deegan, B Duarte, E Figueroa, J Gerwein, A J. Gray, E D. Grosholz, S D. Hacker, A R. Hughes, E Mateos-Naranjo, I A. Mendelssohn, J T. Morris, L A. Munoz-Rodriguez, F J. Nieva, L A. Levin, B Li, W W. Liu, S C. Pennings, A Pickart, S Redondo-Gomez, D M. Richardson, A Salmon

Faculty Publications

In 2014, a DNA-based phylogenetic study confirming the paraphyly of the grass subtribe Sporobolinae proposed the creation of a large monophyletic genus Sporobolus, including (among others) species previously included in the genera Spartina, Calamovilfa, and Sporobolus. Spartina species have contributed substantially (and continue contributing) to our knowledge in multiple disciplines, including ecology, evolutionary biology, molecular biology, biogeography, experimental ecology, biological invasions, environmental management, restoration ecology, history, economics, and sociology. There is no rationale so compelling to subsume the name Spartina as a subgenus that could rival the striking, global iconic history and use of the name Spartina for over 200 …