Digital Commons Network^™

Effect Of Environmental Factors And Residual Sanitizers On Survival And Attachment Of Indicator Organism And Human Pathogens On Fresh Produce, Vijay Singh Chhetri

LSU Doctoral Dissertations

A comprehensive understanding of the behavior of microbial contaminants on produce surfaces in agricultural farms and during post-harvest activities is essential for the development of produce safety risk management strategies. Our studies investigated the survival and the attachment of E. coli on watermelon surfaces in agricultural settings with different levels of vegetation, and the effect of residual sanitizers on the survival and the attachment of E. coli O157: H7 and L. monocytogenes on spinach leaves. The attachment strength (S_R) of the E. coli cells on watermelon surfaces significantly increased (P<0.05) from 0.04 to 0.99 in the first 24 h, which was primarily due to the decrease in loosely attached population, given that the population of strongly attached cells was constant. The daily die-off rate of E. coli ranged from -0.12 …

Key Users, Hashtags, And Topics: Network Analyses Of Twitter During Natural Disasters, Rui Wang

LSU Doctoral Dissertations

During natural disasters, social media can play prominent roles in how publics learn and communicate about disasters, as well as improve disaster communication and operations. The open and flat structure of Twitter platform makes Twitter a suitable platform for disaster communication.

The purpose of this study is to explore the key users, hashtags, and topics in the Twitter networks of natural disasters. In doing so, this study takes a multi-method approach including big data mining and a series of network analyses. This study has collected 9,716,677 tweets during five natural disasters: Louisiana Flood 2016, Hurricane Florence 2018, Hurricane Michael 2018, …

Finding Rough America, Eric Kennedy

LSU Doctoral Dissertations

Finding Rough America seeks to establish and examine the components of a body of texts, both in prose and film, that I call Rough America. I argue that this corpus works to broaden the cultural understanding of literature and film about the lives of American lower classes. To do so, I adopt and adapt Guy Standing’s conception of the “precariat class,” an economic classification used to identify the widespread precariousness among what was once the middle- and working-classes. After establishing Rough America as following in the tradition of American literary naturalism, I ground the study of the corpus’s primary thematic …

Quantitative Evaluation Of A Lightweight Sediment For A Physical Model Of The Lower Mississippi River, Mauricio Hooper

LSU Doctoral Dissertations

The Lower Mississippi River Physical Model (LMRPM), housed at the LSU Center for River Studies on the Baton Rouge, LA Water Campus, is a distorted, movable bed model comprising the lower 195 miles of the Mississippi River from Donaldsonville through the Head of Passes into the Gulf of Mexico. Since the LMRPM was designed to replicate the hydraulics (i.e., flow and river stages) and bulk non-cohesive sediment transport, the model lightweight sediment must replicate both the incipient motion and two-dimensional dune characteristics (height and length). In addition, the model scale and distortion require that the sediment time scale be determined …

Effective Geometric Modeling For Scientific Computing And Forensic Reconstruction, Celong Liu

LSU Doctoral Dissertations

Geometric modeling is a fundamental and critical problem for many computer graphic and computer vision problems. We usually want to build a parameterization which establishes a low-distortion one-to-one map between geometric data and canonical parametric domain, and it is a fundamental tool to support many visual data processing tasks such as mesh generation, finite element simulations, visual analytics, geometric reconstruction, etc. In this dissertation, I studied two problems. The first is to construct low- distortion canonical (polycube) parameterization of large-scale geometric regions, with which high-quality semi-structured quad meshes can be generated and used to facilitate more efficient scientific computing. The …

Three Essays On Irrigation Water Management In Louisiana Crop Production, Tej Kumar Gautam

LSU Doctoral Dissertations

Competition for water resources among agricultural, municipal, and industrial sectors is increasing even in a traditionally water rich state like Louisiana. Irrigation water management is likely to be a critical issue in Louisiana in the near future. We conducted state-wide farm surveys to collect information regarding irrigation practices and concerns from Louisiana farmers during the crop years 2015 and 2016.

We analyzed three different issues associated with irrigation water management in Louisiana crop production. These analyses are presented in the form of three different essays. The first essay identifies the determinants of irrigation technology adoption and crop acreage allocation by …

The Garbage That We Eat: Metabolizing Food-Waste In New Orleans, Louisiana, Kelly L. Haggerty

LSU Master's Theses

The 2017 Climate Action for a Resilient New Orleans report strives to divert 50 percent of waste by 2030. In the same year, waste companies had only managed to divert 5 percent of the total annual waste in Orleans Parish. Nearly a decade away from 2030, city officials have not even tested or implemented strategies to reach this goal. While city officials scramble to launch pilot projects, community and grassroots organizations center around recovering and transforming garbage and food waste. Using interviews and surveys with food-waste organizers from May to August 2018, this paper reveals that managing food-waste on a …

An Archive Of Pain: In Queer Suicide's Cultural Wake, Evan Schares

LSU Doctoral Dissertations

In this dissertation, I argue that queer death is a chief site of political struggle over gender, race, and sexuality in contemporary culture. I consider myriad archives in the aftermath of three queer suicides, an aggregate of discourses I call cultural wakes, to examine how white affective investments circulate around the forces of racism, sexism, and citizenship. I place in situ the trauma of queer pain and loss against the global backdrop of public emotionality.

Epic Beginnings: A Symphonic Work And Aaron Copland (The American Stravinsky) Versus Igor Stravinsky, Terrell O. Jones

LSU Doctoral Dissertations

ABSTRACT

The first part of my dissertation is the original music written for this dissertation, which consists of tonal music that describes my life’s journey. I wanted to write something dark, melodic, and very energetic that described my struggles and shows the road I have taken. It exhibits everything that I have learned from my time here at the university. One of the many things that makes my passion so strong is the desire to express myself through music written for ensembles and used in films. The piece is entitled “Epic Beginnings.” Originally, it was named “The Last Dance,” a …

Can Assisted Reproductive Technologies Help Conserve 300 Million Years Of Evolution? A First Attempt At Developing These Technologies For Male Reptiles, Sean M. Perry

LSU Doctoral Dissertations

Biodiversity loss is the most critical environmental problem threatening ecosystem, animal, and human health today. Increases in extinction rates have been observed over the past 50 years, with reptile losses occurring twelve times faster than traditional extinction rates. This demonstrated biodiversity loss is secondary to climate change, habitat destruction, infectious disease, invasive species, poaching, and unsustainable trade. Approximately 20% of all reptiles are threatened with extinction and population declines are approaching rates similar to the current amphibian extinction crisis. Preventing the extinction of reptiles will require humans to acknowledge these losses and develop plans to preserve these evolutionary sentinel species. …

Determination Of Conversion Factors For Various Calibration Geometries Using Barium-133 In A Silver Zeolite Cartridge, Amin Hamideh

LSU Master's Theses

Iodine-131 (I-131) is a major fission product among other radionuclides released during a nuclear incident. This radioiodine has a half-life of 8.02 days and the primary organ of uptake through ingestion or inhalation is the thyroid gland. For these reasons, nuclear power plants must routinely monitor I-131 through air sampling. Currently, there are two adsorbing media to collect I-131: activated charcoal and silver zeolite cartridges. Silver zeolite cartridges are generally used during a post nuclear incident due to its affinity for iodine while not adsorbing noble gases such as krypton-85 and xenon-135. After an air sample is taken from a …

A Conductor's Guide To Alec Roth's "A Time To Dance", Eric Z. Rubinstein

LSU Doctoral Dissertations

The purpose of this monograph is to provide a comprehensive analysis and conductor’s guide for Alec Roth’s masterwork, A Time to Dance. This study will explore the origins of this work, provide rehearsal and performance considerations, and bring greater attention to its composer, Alec Roth. Compared to his English contemporaries, Alec Roth’s (b.1948) music is lesser-known within the British tradition. Roth composes for choir, orchestra, and musical theatre and is also well-known for his contributions to both the guitar and gamelan repertory. His music spans a variety of languages, voicings, orchestrations, and levels of difficulty, as he is also …

Iron Mediated Organic Preservation In A River Influenced Continental Margin, Neha Ajit Ghaisas

LSU Doctoral Dissertations

Continental margins such as the Mississippi river influenced Louisiana shelf (MIS), are important land-ocean interfaces where excessive water column productivity and rapid burial results in large amounts of organic carbon (OC) being sequestered in the sediments. The preservation of OC in sediments is controlled by a number of processes among which mineral-OC interactions are considered to be more important. Specifically, the interactions between sediment iron (Fe) species and OC have been shown to promote carbon preservation. However, the exact nature of preservation mechanism is not well understood and is based on limited global data, which specifically lacks estimates from large …

Modes Of Cartoon Corporeal Performance, Gregory Langner

LSU Doctoral Dissertations

This dissertation project works to introduce and interrogate a phenomenon I am calling cartoon corporeality. The phenomenon refers to the varied ways in which cartoons “escape” their usual two-dimensionality through performance, appearing to manifest in physical environments in ways that should be understood as culturally impactful. Cartoon corporeality encompasses different modes of performance wherein the explicit visual presence of a cartoon subject informs an immediately observable physical impact through the body of the performer. I interrogate the phenomenon by focusing on four select modes of cartoon corporeal performance: videogame play, cosplay, theatrical adaptation, and the active weaving of cartoons …

Putting It All Together: Adding Value To The Global Ocean And Climate Observing Systems With Complete Self-Consistent Ocean State And Parameter Estimates, David Trossman

Faculty Publications

No abstract provided.

Carceral Dreams: Punishment In Contemporary Utopian Fiction, Amandine Faucheux

LSU Doctoral Dissertations

This dissertation argues that the representation of legal violence—punishment—is an essential definitional axis to utopian literature. Utopian scholarship tends to position the political or economic system that a text imagines as the key determinant of that text’s identity as a Utopia, a dystopia, or an anti-Utopia. I propose instead that the propensity of the imaginary society to inflict violence in a legal or official context defines its utopian or dystopian quality. Through an analysis of twentieth and twenty-first century Anglophone utopian novels and stories by George Orwell, Octavia E. Butler, James Tiptree Jr. (Alice Sheldon), Adam Roberts, and Kelley Eskridge, …

Phase Estimation In Linear And Nonlinear Interferometers, Sushovit Adhikari

LSU Doctoral Dissertations

Phase estimation has a wide range of applications. Over the years, several strategies have been studied to improve precision in phase estimation. These strategies include using exotic quantum states to quantum detection schemes. This dissertation summarizes my effort in improving the precision of phase estimation with a linear and nonlinear interferometer.

Chapter 1 introduces quantum optics and quantum metrology. I introduce all relevant quantum states of light used. We also look into tools and terminologies of quantum metrology such as Fisher information, shot-noise limit, Heisenberg limit, etc., along with examples of phase estimation with a Mach-Zehnder interferometer.

In Chapter 2, …

Bioassay-Guided Isolation And Structure Elucidation Of Fungicidal And Herbicidal Compounds From Ambrosia Salsola (Asteraceae), Frank R. Fronczek

Faculty Publications

The discovery of potent natural and ecofriendly pesticides is one of the focuses of the agrochemical industry, and plant species are a source of many potentially active compounds. We describe the bioassay-guided isolation of antifungal and phytotoxic compounds from the ethyl acetate extract of Ambrosia salsola twigs and leaves. With this methodology, we isolated and identified twelve compounds (four chalcones, six flavonols and two pseudoguaianolide sesquiterpene lactones). Three new chalcones were elucidated as (S)-beta-Hydroxy-2,3,4,6'-tetrahydroxy-5-methoxydihydrochalcone (salsolol A), (S)-beta-Hydroxy-2',4,4',6'-tetrahydroxy-3-methoxydihydrochalcone (salsolol B), and (R)-alpha, (R)-beta-Dihydroxy-2,3,4,4,6'-pentahydroxydihydrochalcone (salsolol C) together with nine known compounds: balanochalcone, six quercetin derivatives, confertin, and neoambrosin. Chemical structures were determined …

Duration Of Protection From Live Attenuated Vs. Sub Unit Hsv-2 Vaccines In The Guinea Pig Model Of Genital Herpes: Reassessing Efficacy Using Endpoints From Clinical Trials, David I. Bernstein, Rhonda D. Cardin, Derek A. Pullum, Fernando J. Bravo, Konstantin G. Kousoulas, David A. Dixon

Faculty Publications

© 2019 Bernstein et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Background Although herpes simplex viruses (HSV) are a major target for vaccine development no vaccine is currently licensed. Methods A live attenuated HSV virus vaccine, VC2 was compared to a subunit HSV vaccine, glycoprotein D (gD2) administered with the adjuvant, MPL/Alum using the Guinea pig model of genital herpes. Three doses of intramuscular (IM) vaccine were provided followed by intravaginal challenge …

Apoptosis Signal-Regulating Kinase-1 Promotes Inflammasome Priming In Macrophages, Camille N. Immanuel, Bin Teng, Brittany Dong, Elizabeth M. Gordon, Joseph A. Kennedy, Charlean Luellen, Andreas Schwingshackl, Stephania A. Cormier, Elizabeth A. Fitzpatrick, Christopher M. Waters

Faculty Publications

© 2019 the American Physiological Society. previously showed that mice deficient in apo-ptosis signal-regulating kinase-1 (ASK1) were partially protected against ventilator-induced lung injury. Because ASK1 can promote both cell death and inflammation, we hypothesized that ASK1 activation regulates inflammasome-mediated inflammation. Mice deficient in ASK1 expression (ASK1 +/+ ) exhibited significantly less inflammation and lung injury (as measured by neutrophil infiltration, IL-6, and IL-1β) in response to treatment with inhaled lipopolysaccharide (LPS) compared with wild-type (WT) mice. To determine whether this proinflammatory response was mediated by ASK1, we investigated inflammasome-mediated responses to LPS in primary macrophages and bone marrow-derived macrophages (BMDMs) …

The Effect Of The Oxford Movement On The Family And Eucharistic Symbolism In Victorian Literature, Elizabeth Vukovics

Honors Capstones

No abstract provided.

The Political Leanings Of Louisiana’S Young Independents, Zoe Williamson

Honors Capstones

No abstract provided.

Magnetic Properties Of Feni3 Nanoparticle Modified Pinus Radiata Wood Nanocomposites, Li Li Wang, Na Li, Tiqi Zhao, Bin Li, Yali Ji

Faculty Publications

Magnetic FeNi3 nanoparticles were synthesized in the internal structure of wood through an in situ fabrication approach. The morphology, crystalline phase and chemical composition of the FeNi3 modified wood was investigated by X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) with energy-dispersive X-ray (EDX) analysis and X-ray photoelectron spectroscopy (XPS). SEM confirmed that the magnetic nanoparticles were densely dispersed in the wood matrix. The magnetic hysteresis loops showed that the magnetism of composites is dependent on the amount of FeNi3 loading. The saturation magnetization of magnetic wood increases from 6.3 to 10.8 emu/g with an …

Trends In Global Shark Attacks, Stephen R. Midway, Athanassios C. Tsikliras, Tyler Wagner, George H. Burgess

Faculty Publications

No abstract provided.

Intertwined Markings: Metafiction In The Digital Age, Taylor Danielle Orgeron

LSU Doctoral Dissertations

Intertwined Markings: Metafiction in the Digital Age maps the historical and thematic relationship between video games and contemporary works of metafiction first by detailing the intertwined histories of video games and contemporary metafiction, and then by applying new materialist and game studies methodologies to both video games and contemporary novels. Not only does the height of postmodern metafiction directly coincide with the introduction of home consoles and the golden age of arcade video games in the 1970s, but the same postmodern works considered to be canonical in metafiction studies are also those lauded as the first hypertexts in new media …

John Adams Composing Through Others: Modeling, Innovation, And Recomposition, Michael Edward Palmese

LSU Doctoral Dissertations

John Adams has frequently embedded allusions to the music of others in his work while also drawing on more general stylistic conventions and sensibilities of others to inform his creative output. Although this dynamic has been widely acknowledged in Adams’s body of work by scholars and critics generally, it has received little sustained attention or explanation. I argue that much of his work involves “composing through others,” a process in which he adopts, in various ways, the aesthetic conventions, styles, and sensibilities of other composers. By unearthing traces of this creative approach through a focus on short, but significant, periods …

An Intersectional Analysis Of Black Working-Class Women Becoming Members Of The Academy, Tifanie W. Pulley

LSU Doctoral Dissertations

In a society based on race, gender and class, Black working-class women are some of the most economically marginalized invisible people in American society. However, some of these women have managed to escape economic marginalization and rise to the highest academic levels. Black working-class women becoming members of the academy is a curious phenomenon, given that the traditional American faculty profile is populated largely by white males from middle class backgrounds. Being Black, ­­working-class and female brings together a complex process of identity construction, class-consciousness, and status negotiation. For one, they were not raised in families that have traditional economic, …

When Can Competition And Dispersal Lead To Checkerboard Distributions?, Tad Dallas, Brett A. Melbourne, Alan Hastings

Faculty Publications

© 2018 The Authors. Journal of Animal Ecology © 2018 British Ecological Society Checkerboard distributions—mutually exclusive species co-occurrences—are a common observation in community ecology and biogeography. While the underlying causes of checkerboard distributions have remained elusive, a long-standing argument is that they are representative of strong competitive interactions and/or dispersal limitation. We explore this using a stochastic two-patch metacommunity model combined with an experimental two-patch system of competing Tribolium species, quantifying checkerboard distributions using the abundance-based index A st . We find that maintenance of checkerboard distributions is possible in a limited parameter space consisting of low dispersal rates, low …

Inward Rectifier Potassium (Kir) Channels Mediate Salivary Gland Function And Blood Feeding In The Lone Star Tick, Amblyomma Americanum, Zhilin Li, Kevin R. Macaluso, Lane D. Foil, Daniel R. Swale

Faculty Publications

© 2019 Li et al. Background Tick feeding causes extreme morbidity and mortality to humans through transmission of pathogens and causes severe economic losses to the agricultural industry by reducing livestock yield. Salivary gland secretions are essential for tick feeding and thus, reducing or preventing saliva secretions into the vertebrate host is likely to reduce feeding and hinder pathogen life cycles. Unfortunately, the membrane physiology of tick salivary glands is underexplored and this gap in knowledge limits the development of novel therapeutics for inducing cessation of tick feeding. Methodology We studied the influence of inward rectifier potassium (Kir) channel subtypes …

Effects Of Rare-Earth (R = Pr, Gd, Ho, Er) Doping On Magnetostructural Phase Transitions And Magnetocaloric Properties In Ni43-Xrxmn46sn11 Shape Memory Alloys, Anil Aryal, Sudip Pandey, Igor Dubenko, Dipanjan Mazumdar, Shane Stadler, Naushad Ali

Faculty Publications

A series of rare-earth-doped Ni43-xRxMn46Sn11 (x= 0, 1 and R = Pr, Gd, Ho, Er) alloys was fabricated by arc melting, and their structural, magnetic, and magnetocaloric properties were studied through room temperature X-ray diffraction (XRD), differential scanning calorimetry, and magnetization measurements. Analysis of XRD data reveal that the alloys crystallize in the cubic L21 austenite phase structure as the major phase with a small trace of martensitic phase (MP). The martensitic transition temperature (TM) shifts to consecutive higher temperatures with the substitution of Pr, Gd, Ho, and Er. A drastic shift in TM by 60 K relative to the …