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Gendered Violence And The Family: An Analysis Of The 14th-Century Epic "Lion De Bourges", Ashley Paige Holt

LSU Doctoral Dissertations

This dissertation is the first to focus on gender roles within the fourteenth-century French epic Lion de Bourges and the first work to feature extensive translations into English of this medieval text. Using the cyclical dismemberment and reunification of the Bourges family as a lens, it brings into focus the various members of the family, their relationships, and the larger thematic questions about family and society put forward by the poet. Chapter one interrogates the notion of the king as a national father figure as well as the spread of injury and violence from the father/king to the members of …

Toybox: A New Approach For Auxiliary Percussion Instruments At The Beginning Level, Spencer Craig Jones

LSU Doctoral Dissertations

Currently, there exist little materials to introduce elementary students to auxiliary percussion instruments. There is a need for the creation of more instructional material for this age group that provides pedagogy descriptions for the instruments as well as playing examples. The purpose of this project is to create a method book that provides pedagogy examples for auxiliary percussion instruments while also providing playing examples to use.

The Relationship Between Family Environment And Specific Phobias, Jerrica Renee Guidry

LSU Doctoral Dissertations

Specific phobias are the most prevalent disorder among adults and highly common among children. Additionally, specific phobias diagnosed in childhood has been associated other serious mental illnesses later in life (de Vrie et al., 2019). Research pertaining to parenting factors associated with anxiety disorders has been extensive, including parental psychopathology, parent-child relationships, parental control, and parental stress. However, less emphasis has been placed on familial factors which may contribute to the development and maintenance of specific phobias. According to the limited literature focusing on the family factors associated with specific phobias, parent psychopathology and parent over-control are important factors. Multiple …

Partial Least Squares Enhances Genomic Prediction Of New Environments, Osval A. Montesinos-López, Abelardo Montesinos-López, Kismiantini, Armando Roman-Gallardo, Keith Gardner, Morten Lillemo, Roberto Fritsche-Neto, José Crossa

Faculty Publications

In plant breeding, the need to improve the prediction of future seasons or new locations and/or environments, also denoted as “leave one environment out,” is of paramount importance to increase the genetic gain in breeding programs and contribute to food and nutrition security worldwide. Genomic selection (GS) has the potential to increase the accuracy of future seasons or new locations because it is a predictive methodology. However, most statistical machine learning methods used for the task of predicting a new environment or season struggle to produce moderate or high prediction accuracies. For this reason, in this study we explore the …

Navier-Stokes Equations In One And Two Dimensions, Jon Nerdal

LSU Master's Theses

The Navier-Stokes equations are an important tool in understanding and describing fluid flow. We investigate different formulations of the incompressible Navier-Stokes equations in the one-dimensional case along an axis and in the two-dimensional case in a circular pipe without swirl. For the one-dimensional case we show that the velocity approximations are remarkably accurate and we suggest that understanding this simple axial behaviour is an important starting point for further exploration in higher dimensions. The complexity of the boundary is then increased with the two-dimensional case of fluid flow through the cross section of a circular pipe, where we investigate two …

Neural Networks For Interference Mitigation In Satellite Communication Systems, Martha E. Cash

LSU Master's Theses

The objective of this thesis is to utilize the power of machine learning to develop a neural network-aided receiver in a DVBS-2X satellite communication system to improve the downlink transmission quality in the presence of interference. An emphasis is placed on mitigating the effects caused by non-linear distortions, carrier frequency offset, and additive white Gaussian noise. This thesis proposes a feed-forward neural network with two hidden layers to compensate for the distortions in the received signal. The proposed system model uses 16-APSK modulation scheme. The neural network is tested under varying degrees of non-linear distortion, frequency offsets, and varying levels …

Tunable Passive Shock And Vibration Isolators For Rotational Isolation, Chase B. Lemaire

LSU Master's Theses

Shock and vibration isolation are a critical need in helmets, which are widely used to protect athletes, workers, soldiers, and astronauts. Passive vibration isolation systems are a good option when mass and volume should be minimized and when the experienced loadings can be predicted. However, it is frequently challenging to find materials and structures which exhibit the optimal vibration and impact isolation properties for an application. As a case study illustrating a novel design paradigm for rotational shock absorption, a family of optimal solutions for the physical properties of American football helmets is presented. Lumped parameter Simulink models simulate a …

Factors Associated With Racial And Ethnic Minority Youths' Mental Health Help-Seeking At School, Sam Allouche

LSU Doctoral Dissertations

Despite the high prevalence and associated consequences of mental health problems in youth, adolescents with these problems are often left untreated. This service gap is even greater in racial and ethnic minority youth who not only engage in treatment less frequently, but also experience far greater discrimination and systemic inequality than non-ethnic or racial minority students; factors further contributing to a need for service. Schools may provide an ideal location to treat mental health problems in youth, in part because schools eliminate structural barriers, but also because school staff have an opportunity to observe students across a range of functioning. …

Insights Into The Speciation Process From Genomic And Phenotypic Analysis Of An Avian Hybrid Zone In Amazonia, Glaucia Christina Del-Rio

LSU Doctoral Dissertations

Understanding the outcome of secondary contact is essential to shed light on the mechanisms governing species formation and maintenance. In Amazonia, closely related bird taxa with limited dispersal abilities are often separated by rivers, which presumably act as dispersal barriers. However, at the headwaters, rivers cease to be dispersal barriers, and this generates opportunities for secondary contact. In my dissertation, I studied genomic mechanisms associated with phenotypic differences, mitochondrial DNA structure, and putative reproductive barriers between two hybridizing Amazonian bird species in the genus Rhegmatorhina, a group of antbirds that find their arthropod prey exclusively by following army-ant swarms. …

Cover Cropping: Sensor-Based Estimations Of Biomass Yield And Nutrient Uptake And Its Impact On Sugarcane Productivity, Hector H. Fajardo Duran

LSU Master's Theses

Sugarcane in Louisiana can be harvested for up to three years from one planting. Soil cultivation along sides of established beds is done for weed control and improve fertilizer use efficiency which increases the risk of soil degradation and yield decline. Planting cover crops (CC) is a soil conservation practice and an effective strategy to improve soil health and nutrient recycling. Limited work has been done on remote sensor-based evaluation of the potential nutrient benefits from cover crops and its effect on nutrient cycling on sugarcane systems. This study was conducted to evaluate the effect of two planting methods (broadcast …

Risk-Taking And Career Achievement: The Moderating Role Of "Getting Along" Personality Traits, John-Luke Mccord

LSU Doctoral Dissertations

The current dissertation examined the moderating effects of personality traits on the relationship between risk propensity and career advancement. It was hypothesized that certain personalities that facilitate dependability and building support can impact the probability of successful risk-taking at work, resulting in greater career advancement. A nationally representative panel study of British households (n = 13,743) was used to examine the extent to which Big Five personality traits interact with risk propensity to predict career achievement. Results showed a strong, positive association between risk propensity and income growth over time. The “getting along” personality traits were not shown to have …

The Importance Of Co2 Recapture In The Co2 Concentrating Mechanism Of Chlamydomonas Reinhardtii, Ashwani Rai

LSU Doctoral Dissertations

The aim of this thesis is to investigate the CO₂ concentrating mechanism (CCM) of Chlamydomonas reinhardtii and to develop a quick method for estimating the activity of carbonic anhydrases (CAs). The first project demonstrates that there are two almost identical mitochondrial CAs in C. reinhardtii, CAH4 and CAH5, that help to maintain photosynthesis and minimize the leak of CO₂ generated by respiration and photorespiration. We used an RNAi approach to reduce the expression of CAH4 and CAH5 so that their physiological functions could be studied. RNAi mutants with low expression of CAH4 and CAH5 have impaired rates …

Surpassing The Standard Quantum Limit Using An Optical Spring, Torrey Cullen

LSU Doctoral Dissertations

In 1916, Albert Einstein predicted the existence of gravitational waves based on his new theory of general relativity. He predicted an accelerating mass with a non-zero quadrupole moment would emit energy in the form of gravitational waves. Often referred to as ripples in space-time, gravitational waves are extremely small by the time reach Earth, potentially having traveled hundreds of megaparsecs. It is common for these ripples in space-time to stretch and squeeze matter 1000 times smaller than the width of a proton.
Laser interferometer observatories were first built in the 1990s in the US and Europe, and as sensitivity improvements …

Breeding Ecology Of Mottled Ducks In Southwestern Louisiana, Elizabeth Sophia Bonczek

LSU Doctoral Dissertations

Mottled ducks are a resident species found in the southern United States that rely on coastal marsh and associated habitat to fulfill the needs of the entirety of their annual cycle. Population monitoring has revealed declines in western Gulf Coast (WGC) mottled ducks since 2008. Mottled duck populations are influenced by survival and recruitment, and changes in these factors may contribute to population declines. The overarching goal of this project was to identify the mechanisms potentially limiting WGC mottled ducks.

I captured adult female mottled ducks during molt on Rockefeller Wildlife Refuge and adjacent lands in southwestern Louisiana from 2017–2019. …

Chloride Channels That Mediate A Transient Nitric Oxide-Dependent Synaptic Polarity Switch In Retinal Amacrine Cells., Tyler Christopher Rodriguez

LSU Doctoral Dissertations

Cytosolic chloride (Cl^-) concentration determines whether GABAergic and glycinergic synapses are inhibitory or excitatory. Ionotropic GABA and glycine receptors passively conduct Cl­^- leading to membrane depolarization or hyperpolarization depending on the Cl^- equilibrium potential. Accordingly, the distribution of Cl^- across the plasma membrane has the potential to determine the properties of networks of retinal amacrine cells (ACs) and their postsynaptic partners. Ion channels are responsible for establishing Cl^- reversal potential. Nitric oxide (NO) is a signaling molecule that can be generated in the inner retina where ACs form synapses. We have shown that NO …

Plastic And Evolved Responses In The Eastern Oyster, Crassostrea Virginica, To Environmental Variation In The Northern Gulf Of Mexico, Kyle Sirovy

LSU Doctoral Dissertations

Climate change and other anthropogenic impacts are causing rapid alterations to many of the world’s most productive coastal ecosystems and there is an urgent need to understand how species will respond to these environmental changes. Organisms may respond through plasticity, evolution, or the evolution of plasticity. In this dissertation, I evaluate the role of plastic and evolved responses in the eastern oyster, Crassostrea virginica, to environmental variation in the northern Gulf of Mexico. I use comparative transcriptomics, physiology, and morphology to examine the relative contribution of plastic and evolved responses for oysters exposed to low salinity and outplant sites …

A Roadmap For Quality Control Of Hardening And Hardened Printed Concrete, Viktor Mechtcherine, Kim Van Tittelboom, Ali Kazemian, Eric Kreiger, Behzad Nematollahi, Venkatesh Naidu Nerella, Manu Santhanam, Geert De Schutter, Gideon Van Zijl, Dirk Lowke, Egor Ivaniuk, Markus Taubert, Freek Bos

Faculty Publications

This article focuses on the specifics in characterizing the properties of additively manufactured, cement-based materials in their hardening and hardened states. Such characterization is required for the material development, structural design, and quality control of both printable material and 3D-printed elements. The related challenges are associated with the printed material's layered structure, which results in higher degrees of anisotropy and inhomogeneity in comparison to conventionally cast concrete. Thus, in the production of test specimens, the particularities of the real-scale 3D-printing process must be considered. Here a distinction is made between the production of samples for material testing prior to or …

Northwest - Summer 2022, Lsu Agcenter

Horticulture Hints

No abstract provided.

Northeast - Summer 2022, Lsu Agcenter

Horticulture Hints

No abstract provided.

Central - Summer 2022, Lsu Agcenter

Horticulture Hints

No abstract provided.

Southeast - Summer 2022, Lsu Agcenter

Horticulture Hints

No abstract provided.

Southwest - Summer 2022, Lsu Agcenter

Horticulture Hints

No abstract provided.

Publisher Correction: A D2 To D1 Shift In Dopaminergic Inputs To Midbrain 5-Ht Neurons Causes Anorexia In Mice (Nature Neuroscience, (2022), 25, 5, (646-658), 10.1038/S41593-022-01062-0), Xing Cai, Hailan Liu, Bing Feng, Meng Yu, Yang He, Hesong Liu, Chen Liang, Yongjie Yang, Longlong Tu, Nan Zhang, Lina Wang, Na Yin, Junying Han, Zili Yan, Chunmei Wang, Pingwen Xu, Qi Wu, Qingchun Tong, Yanlin He, Yong Xu

Division of Basic Science Faculty Publications

In the version of this article initially published, the bar graph shown in Fig. 6d was a duplicate of Fig. 6c. The figure panel has been corrected in the HTML and PDF versions of the article.

Licogliflozin For Nonalcoholic Steatohepatitis: A Randomized, Double-Blind, Placebo-Controlled, Phase 2a Study, Stephen A. Harrison, Federico Perez Manghi, William B. Smith, Diana Alpenidze, Diego Aizenberg, Naomi Klarenbeek, Chi Yi Chen, Eli Zuckerman, Eric Ravussin, Phunchai Charatcharoenwitthaya, Pin Nan Cheng, Helena Katchman, Samuel Klein, Ziv Ben-Ari, Anisha E. Mendonza, Yiming Zhang, Miljen Martic, Shenglin Ma, Sheena Kao, Sandra Tanner, Alok Pachori, Michael K. Badman, Yan Ling He, Chinweike Ukomadu, Eric Sicard

Clinical Research Faculty Publications

Nonalcoholic steatohepatitis (NASH) is a common chronic liver disease that may advance to fibrosis and lead to mortality; however, no pharmacotherapy is currently available. We tested the hypothesis that inhibition of both the sodium–glucose cotransporters 1 and 2 with licogliflozin would lead to improvement in NASH. A total of 107 patients with phenotypic or histologic NASH were randomized (1:2:2) to receive oral administration of either placebo (n = 21), licogliflozin 30 mg (n = 43) or 150 mg (n = 43) once daily for 12 weeks. Licogliflozin 150 mg showed a significant 32% (80% confidence interval (CI): 21–43%; P = …

The Covid-19 Pandemic And Associated Increases In Experiences Of Assault Violence Among Black Men With Low Socioeconomic Status Living In Louisiana, Kaylin Beiter, Denise Danos, Erich Conrad, Stephanie Broyles, Jovanny Zabaleta, Jason Mussell, Stephen Phillippi

Population and Public Health Science Faculty Publications

Background: The COVID-19 pandemic has had mental health, social, and economic implications among communities with high levels of social disadvantage; this may have impacted community violence rates. The objective of this study was to characterize overall trends in assault and social disadvantage of patients experiencing assault before and during the COVID-19 pandemic. Methods: All trauma activations at a level one trauma center serving the entire southeast Louisiana region were included during March–August pre-COVID (2018–2019) and during COVID (2020). ICD-10 E-codes were used to identify trauma intent (assault vs. other). Assaults in this context are defined as physical injuries caused by …

Erratum: The Perfect Storm? Covid-19 And Substance Use Amongst Social Work Students In The Usa (The British Journal Of Social Work (2021) Doi: 10.1093/Bjsw/Bcab192), Youn Kyoung Kim, Sung Seek Moon, Mansoo Yu, Mee Young Um, Arati Maleku, Omoshola Kehinde, David Pooler

Faculty Publications

In the originally published manuscript, the affiliation for co-author Dr Arati Maleku contained an error. This should read: College of Social Work instead of College only. This error is now corrected in the article online.

An Il1rl1 Genetic Variant Lowers Soluble St2 Levels And The Risk Effects Of Apoe-Ε4 In Female Patients With Alzheimer’S Disease, Yuanbing Jiang, Xiaopu Zhou, Hiu Yi Wong, Li Ouyang, Fanny C.F. Ip, Vicky M.N. Chau, Shun Fat Lau, Wei Wu, Daniel Y.K. Wong, Heukjin Seo, Wing Yu Fu, Nicole C.H. Lai, Yuewen Chen, Yu Chen, Estella P.S. Tong, Michael W. Weiner, Paul Aisen, Ronald Petersen, Clifford R. Jack, William Jagust, John Q. Trojanowski, Arthur W. Toga, Laurel Beckett, Robert C. Green, Andrew J. Saykin, John Morris, Leslie M. Shaw, Zaven Khachaturian, Greg Sorensen, Lew Kuller, Marcus Raichle, Steven Paul, Peter Davies, Howard Fillit

Clinical Research Faculty Publications

Changes in the levels of circulating proteins are associated with Alzheimer’s disease (AD), whereas their pathogenic roles in AD are unclear. Here, we identified soluble ST2 (sST2), a decoy receptor of interleukin-33–ST2 signaling, as a new disease-causing factor in AD. Increased circulating sST2 level is associated with more severe pathological changes in female individuals with AD. Genome-wide association analysis and CRISPR–Cas9 genome editing identified rs1921622, a genetic variant in an enhancer element of IL1RL1, which downregulates gene and protein levels of sST2. Mendelian randomization analysis using genetic variants, including rs1921622, demonstrated that decreased sST2 levels lower AD risk and related …

Beyond Quantum Cluster Theories: Multiscale Approaches For Strongly Correlated Systems, Herbert F. Fotso, Ka Ming Tam, Juana Moreno

Faculty Publications

The degrees of freedom that confer to strongly correlated systems their many intriguing properties also render them fairly intractable through typical perturbative treatments. For this reason, the mechanisms responsible for their technologically promising properties remain mostly elusive. Computational approaches have played a major role in efforts to fill this void. In particular, dynamical mean field theory and its cluster extension, the dynamical cluster approximation have allowed significant progress. However, despite all the insightful results of these embedding schemes, computational constraints, such as the minus sign problem in quantum Monte Carlo (QMC), and the exponential growth of the Hilbert space in …

Charging Of Radioactive And Environmental Airborne Particles, Gyoung G. Jang, Alexander I. Wiechert, Yong Ha Kim, Austin P. Ladshaw, Tyler Spano, Joanna Mcfarlane, Kristian Myhre, Joon Jin Song, Sotira Yiacoumi, Costas Tsouris

Faculty Publications

The charging of various airborne particles was investigated using single-particle levitation and charge-balance equations. Though radioactive decay and triboelectrification can induce charging, it is typically assumed that the aerosols in a radioactive plume will not carry significant charge at steady state since atmospheric particles can have their charge neutralized through the capture of adjacent counter-ions (i.e., diffusion charging). To assess this assumption, we directly measured the surface charge and charge density of various triboelectrically charged aerosols including radioactive uranium oxide (< 1 μm), urban dust, Arizona desert dust, hydrophilic and hydrophobic silica nanoparticles, and graphene oxide powders using an electric field-assisted particle levitator in air. Of these particles, uranium oxide aerosols exhibited the highest surface charge density. Charge balance equations were employed to predict the average charge gained from radioactive decay as a function of time and to evaluate the effects of diffusion charging on triboelectrically charged radioactive and non-radioactive particles in the atmosphere. Simulation results show that particles, initially charged through triboelectrification, can be quickly discharged by diffusion charging in the absence of radioactive decay. Nevertheless, simulation results also indicate that particles can be strongly charged when they carry radionuclides. These experimental and simulation results suggest that radioactive decay can induce strong particle charging that may potentially affect atmospheric transport of airborne radionuclides.

Symplectic Effective Field Theory For Nuclear Structure Studies, D. Kekejian, J. P. Draayer, V. I. Mokeev, C. D. Roberts

Faculty Publications

A symplectic effective field theory that unveils the observed emergence of symplectic symmetry in atomic nuclei is advanced. Specifically, starting from a simple extension of the harmonic-oscillator Lagrangian, an effective field theory applied against symplectic basis states is shown to yield a Hamiltonian system with one fitted parameter. The scale of the system can be determined self-consistently as the ratio of the average volume of a nucleus assumed to be spherical to its volume as determined by the average number of oscillator quanta, which is stretched by the fact that the plane-wave solution satisfies the equations of motion at every …