Digital Commons Network^™

African-Americans Abroad: Josephine Baker And The Controversy Surrounding African-American Figures Outside Of America, Ferin E. Jones

LSU Master's Theses

This paper is about the complexities surrounding the African American experience in other countries. Josephine Baker was one of many figures with important stories.

Mercury Concentrations In Store‐Bought Shrimp, Angelle Mccormick, Matthew D. Robertson, Rebecka Brasso, Stephen R. Midway

Faculty Publications

No abstract provided.

Exploring Students’ Cultural Competence Development During A Short-Term International Experience: A Q-Sort Study, Shelli Rampold, Bradley Coleman, J. C. Bunch, Richie Roberts

Faculty Publications

No abstract provided.

The Genome Sequence Of The Grape Phylloxera Provides Insights Into The Evolution, Adaptation, And Invasion Routes Of An Iconic Pest, Claude Rispe, Fabrice Legeai, Paul D. Nabity, Rosa Fernández, Arinder K. Arora, Patrice Baa-Puyoulet, Celeste R. Banfill, Leticia Bao, Miquel Barberà, Maryem Bouallègue, Anthony Bretaudeau, Jennifer A. Brisson, Federica Calevro, Pierre Capy, Olivier Catrice, Thomas Chertemps, Carole Couture, Laurent Delière, Angela E. Douglas, Keith Dufault-Thompson, Paula Escuer, Honglin Feng, Astrid Forneck, Toni Gabaldón, Roderic Guigó, Frédérique Hilliou, Silvia Hinojosa-Alvarez, Yi Min Hsiao, Sylvie Hudaverdian, Emmanuelle Jacquin-Joly, Edward B. James, Spencer Johnston, Benjamin Joubard

Faculty Publications

Background: Although native to North America, the invasion of the aphid-like grape phylloxera Daktulosphaira vitifoliae across the globe altered the course of grape cultivation. For the past 150 years, viticulture relied on grafting-resistant North American Vitis species as rootstocks, thereby limiting genetic stocks tolerant to other stressors such as pathogens and climate change. Limited understanding of the insect genetics resulted in successive outbreaks across the globe when rootstocks failed. Here we report the 294-Mb genome of D. vitifoliae as a basic tool to understand host plant manipulation, nutritional endosymbiosis, and enhance global viticulture. Results: Using a combination of genome, RNA, …

Reaching 1.5 And 2.0 °C Global Surface Temperature Targets Using Stratospheric Aerosol Geoengineering, Cheryl Harrison

Faculty Publications

Abstract. A new set of stratospheric aerosol geoengineering (SAG) model experiments has been performed with Community Earth System Model version 2 (CESM2) with the Whole Atmosphere Community Climate Model (WACCM6) that are based on the Coupled Model Intercomparison Project phase 6 (CMIP6) overshoot scenario (SSP5-34-OS) as a baseline scenario to limit global warming to 1.5 or 2.0 ∘C above 1850–1900 conditions. The overshoot scenario allows us to applying a peak-shaving scenario that reduces the needed duration and amount of SAG application compared to a high forcing scenario. In addition, a feedback algorithm identifies the needed amount of sulfur dioxide injections …

Ecology Of The Roseau Cane Scale (Nipponaclerda Biwakoensis, Hemiptera: Aclerdidae) In Coastal Louisiana, Leslie Alejandra Aviles Lopez

LSU Master's Theses

Common reed, Phragmites australis, is the dominant plant in the Mississippi River Delta (MRD), Louisiana. Phragmites australis stands reduce soil erosion from wave action, protect the oil infrastructure, and freshwater habitats. In the fall of 2016, widespread reed die-backs in the MRD were associated with outbreaks of an invasive scale Nipponaclerda biwakoensis (Hemiptera: Aclerdidae). Due to the recent detection of the scale, there was limited knowledge of its ecology in the adventive range, and its impacts on P. australis lineages. Therefore, the objectives of my thesis were to determine (1) the host specificity of the N. biwakoensis in important economic …

Solvation Structures And Dynamics Of Small Molecules: Experimental And Computational Studies Using Carbonyl Vibrational Modes As Probe, Xiaoliu Zhang

LSU Doctoral Dissertations

Solutions are ubiquitous in both the global environment and the human body, and play a significant role in scientific research and industrial production. The structures and dynamics of solutions have been studied for centuries. However, conventional experimental methods, whose intrinsic measuring time is on the order of nanoseconds to microseconds, could not detect the fast dynamics taking place in the solution on the timescale of femto- and pico-second. In this dissertation, the ultrafast two-dimensional infrared (2DIR) spectroscopy was applied to characterize the structure and dynamics in three different types of solutions on the sub-picosecond timescale. Linear Fourier transform infrared spectroscopy …

Polymeric Nanoparticles As An Antioxidant Delivery System For Age-Related Eye Disease, Sean M. Swetledge

LSU Doctoral Dissertations

Advantages of polymeric nanoparticles as ocular drug delivery systems include controlled release, enhanced drug stability and bioavailability, and specific tissue targeting. Nanoparticle properties such as hydrophobicity, size, and charge, mucoadhesion, as well as administration route and suspension media affect their ability to overcome ocular barriers and distribute in the eye, and must be carefully designed for specific target tissues and ocular diseases. A review was conducted to serve as a guide to optimizing polymeric nanoparticle delivery systems for ocular drug delivery by discussing the effects of nanoparticle composition and administration method on their ocular penetration, distribution, elimination, toxicity, and efficacy, …

Text-Influenced Expressions Of Understanding: Differences In Kindergartners’ Discourse And Written Retellings Of Traditional And Digital Texts During Buddy Reading, Julie Parrish

LSU Doctoral Dissertations

Buddy reading a text is a collaborative act that typically generates discourse that provides researchers with a glimpse of the comprehending taking place. However, in recent years, the infusion of technology in classrooms has resulted in many traditional texts being replaced by digital versions. Thus, this qualitative case study examined the spoken and written discourse of 12 kindergartners (6 dyads) as they buddy read a traditional and digital text.

Drawing upon two distinct lenses—sociocultural and comprehension signifier—video recordings, transcriptions, and written retellings were analyzed. Specifically, process coding and in vivo coding were used to construct categories and uncover sociocultural patterns …

Fish Community Composition And Structure Near A Freshwater River Diversion In Southeastern Louisiana, Rachel L. Snider

LSU Master's Theses

Gulf of Mexico estuaries, particularly in Louisiana, are among the world’s most productive, with landings of commercially- and recreationally-important species exceeding all other contiguous US states. Coastal wetlands are disappearing at an alarming rate because they have been impounded from Mississippi River water and sediment. Although controversial, one proposed solution is to re-route the Mississippi River through diversions and siphons to supply the freshwater and sediments necessary to rebuild vanishing wetlands, particularly in Barataria Bay and Breton Sound, LA. This strategy is one approach outlined in the Louisiana Coastal Master Plan. This project aimed to describe the composition and structure …

Anatomical Organization And Distinction Of The Sympathetic Inputs To Interscapular Brown Adipose Tissue And Inguinal White Adipose Tissue In The Mouse, Clara Jane Huesing

LSU Doctoral Dissertations

Adipose tissue is a dynamic endocrine organ that contains both the problem and the solution to discovering new therapies for individuals with obesity. Excessive adipose tissue disrupts energy balance and causes a host of comorbidities like insulin resistance and hypertension. On the other hand, adipose tissue is essential for life. During periods of energy demand, sympathetic nerve activity in brown and white adipose tissue stimulates thermogenesis and lipolysis; both of which decrease body weight and improve metabolic health. Therefore, comprehensive insight into the organization of sympathetic innervation and how it communicates with adipocytes is critical in order to utilize its …

Individual Differences In Prospective Memory Aftereffects: The Role Of Working Memory Capacity And Inhibition., Samantha Nicole Spitler

LSU Doctoral Dissertations

This study examined attentional control and executive function (EF) in relation to canceled intentions in two experiments. After an intention is canceled, a commission error occurs when one continues to actively fulfill the intention in response to a prospective memory (PM) cue. Aftereffects are slower response times to inactive PM cues when encountered in ongoing processing. Attentional control was indexed by working memory capacity (WMC) and EF was indexed by three measures of inhibition. In prior canceled intention PM research, attentional control and inhibition have not been extensively studied. However, two major methodological factors in PM research could implicate attentional …

Floodplain Forest Regeneration Dynamics In The Lower Mississippi River Alluvial Valley, Whitney Anne Kroschel

LSU Doctoral Dissertations

Floodplain forest species diversity is driven, in part, by variation in disturbance regime. Flood patterns create heterogeneity in microsite quality from small differences in elevation across a floodplain which, in turn, influence flood timing and duration. Differences in species’ regeneration niches in relation to hydrologic patterns can account for long-term coexistence of various species. In the past century floodplain forests have exhibited a wide range of changes in stand development and species composition as a result of altered hydrology in rivers and floodplains. I evaluated the role of regeneration in floodplain forest systems of the Lower Mississippi River Alluvial Valley …

Edwardsiella Ictaluri Is Capable Of Persisting In Channel Catfish By Evading Host T Cell And Cell Death Responses, Elizabeth Watts Griggs

LSU Doctoral Dissertations

Edwardsiella ictaluri is a gram-negative bacterium of the family Enterobacteriaceae that infects and causes enteric septicemia (ESC) of channel catfish (Ictalurus punctatus), a fatal disease costing the catfish industry millions of dollars in losses each year. Edwardsiella. ictaluri is capable of replicating in catfish head-kidney-derived-macrophages (HKDM), and like many other gram-negative bacteria, E. ictaluri encodes a Type III Secretion System (T3SS) that is required for virulence and intracellular replication. In the case of E. ictaluri, the T3SS translocates effectors from the Edwardsiella containing vacuole (ECV) through the bacterial cell wall and the vacuolar membrane directly to the …

Characterization Of Shallow Subsurface Hydrology In Large Fine-Grained Floodplains, Mary Grace Lemon

LSU Doctoral Dissertations

Floodplains are hydrologically dynamic, receiving water from overbank events, hyporheic flows, local precipitation, and regional groundwater sources. These sources are variously important contributors to the heterogeneous floodplain water pool that includes matrix water in soil micropores, mobile water in soil macropores, groundwater below the rooting zone, ephemeral to seasonal surface storage, and permanent surface water features such as oxbow lakes, sloughs, and other secondary channels. All sources may be ecologically relevant for floodplain vegetation, but the exact roles of each source in both controlling soil water and shallow groundwater recharge and in controlling floodplain water drainage are not well understood, …

Insights To Gray Seal (Halichoerus Grypus) Foraging Ecology From Stable Isotope And Dna Metabarcoding Analyses, Keith Michael Hernandez

LSU Doctoral Dissertations

The enactment of wide-ranging conservation laws in the United States enabled the recovery of many marine mammal species. However, as many species have surpassed predicted recovery goals, there is an increasing number of marine mammal-human interactions. For example, in the northeast US, the recovery of gray seals (Halichoerus grypus atlantica), coupled with declines in commercially important fishery species, has prompted discussions of revised management, and potentially lethal control measures. Much of this concern stems from seal-fisheries interactions, which necessitates an understanding of seal diets and foraging ecology. However, existing research is out of date and reliant primarily on …

Natural Geochemical Markers Reveal Environmental History And Population Connectivity Of Common Cuttlefish In The Atlantic Ocean And Mediterranean Sea, Jay R. Rooker, R. J.David Wells, Piero Addis, Haritz Arrizabalaga, Miguel Baptista, Giovanni Bearzi, Michael A. Dance, Igaratza Fraile, Thomas Lacoue-Labarthe, Jessica M. Lee, Persefoni Megalofonou, Rui Rosa, Ignacio Sobrino, António V. Sykes, Roger Villanueva

Faculty Publications

Natural markers (δ 13 C and δ 18 O stable isotopes) in the cuttlebones of the European common cuttlefish (Sepia officinalis) were determined for individuals collected across a substantial portion of their range in the Northeast Atlantic Ocean (NEAO) and Mediterranean Sea. Cuttlebone δ 13 C and δ 18 O were quantified for core and edge material to characterize geochemical signatures associated with early (juvenile) and recent (sub-adult/adult) life-history periods, respectively. Regional shifts in cuttlebone δ 13 C and δ 18 O values were detected across the 12 sites investigated. Individuals collected from sites in the NEAO displayed more enriched …

Intraspecific And Biogeographical Variation In Foliar Fungal Communities And Pathogen Damage Of Native And Invasive Phragmites Australis, Warwick J. Allen, Aaron E. Devries, Nicholas J. Bologna, Wesley A. Bickford, Kurt P. Kowalski, Laura A. Meyerson, James T. Cronin

Faculty Publications

© 2020 John Wiley & Sons Ltd Aim: Recent research has highlighted that the relationship between species interactions and latitude can differ between native and invasive plant taxa, generating biogeographical heterogeneity in community resistance to plant invasions. In the first study with foliar pathogens, we tested whether co-occurring native and invasive lineages of common reed (Phragmites australis) exhibit non-parallel latitudinal gradients in foliar fungal communities, pathogen susceptibility and damage, and whether these biogeographical patterns can influence the success of invasion. Location: North America. Time period: 2015–2017. Major taxa studied: Perennial grass P. australis. Methods: We surveyed 35 P. australis field …

Dynamic Glucose Disposal Is Driven By Reduced Endogenous Glucose Production In Response To Voluntary Wheel Running: A Stable Isotope Approach, Timothy D. Allerton, Greg M. Kowalski, Hardy Hang, Jacqueline Stephens

Faculty Publications

© 2020 the American Physiological Society. Dynamic glucose disposal is driven by reduced endogenous glucose production in response to voluntary wheel running: A stable isotope approach. Am J Physiol Endocrinol Metab 319: E2-E10, 2020. First published April 28, 2020; doi:10.1152/ajpendo.00450.2019.-To resolve both the systems level and molecular mechanisms responsible for exerciseinduced improvements in glucose tolerance, we sought to test the effect of voluntary wheel running exercise on postprandial glucose dynamics. We utilized a stable isotope-labeled oral glucose tolerance test (SI-OGTT) incorporating complementary deuterium glucose tracers at a 1:1 ratio (2-2H-glucose and 6-6 2H-glucose; 2g/kg lean body mass) to distinguish between …

Β-Hydroxybutyrate Is Reduced In Humans With Obesity-Related Nafld And Displays A Dose-Dependent Effect On Skeletal Muscle Mitochondrial Respiration In Vitro, Jacob T. Mey, Melissa L. Erickson, Christopher L. Axelrod, William T. King, Chris A. Flask, Arthur J. Mccullough, John P. Kirwan

Division of Basic Science Faculty Publications

β-Hydroxybutyrate is reduced in humans with obesity-related NAFLD and displays a dose-dependent effect on skeletal muscle mitochondrial respiration in vitro. Am J Physiol Endocrinol Metab 319: E187-E195, 2020. First published May 12, 2020; doi:10.1152/ajpendo.00058.2020.-Nonalcoholic fatty liver disease (NAFLD) is characterized by hepatic fat accumulation and impaired insulin sensitivity. Reduced hepatic ketogenesis may promote these pathologies, but data are inconclusive in humans and the link between NAFLD and reduced insulin sensitivity remains obscure. We investigated individuals with obesity-related NAFLD and hypothesized that β-hydroxybutyrate (βOHB; the predominant ketone species) would be reduced and related to hepatic fat accumulation and insulin sensitivity. Furthermore, …

Effectiveness Of Sodium-Glucose Co-Transporter-2 Inhibitors On Ischaemic Heart Disease, Yun Shen, Jian Zhou, Lizheng Shi, Elizabeth Nauman, Peter T. Katzmarzyk, Eboni G. Price-Haywood, Ronald Horswell, San Chu, Shengping Yang, Alessandra N. Bazzano, Somesh Nigam, Gang Hu

Population and Public Health Science Faculty Publications

Aim: To compare the cardiovascular risks between users and non-users of sodium-glucose co-transporter-2 (SGLT2) inhibitors based on electronic medical record data from a large integrated healthcare system in South Louisiana. Materials and methods: Demographic, anthropometric, laboratory and medication prescription information for patients with type 2 diabetes who were new users of SGLT2 inhibitors, either as initial treatments or as add-on treatments, were obtained from electronic health records. Mediation analysis was performed to evaluate the association of use of SGLT2 inhibitors and changes of metabolic risk factors with the risk of incident ischaemic heart disease. Results: A total of 5338 new …

Louisiana Agriculture Summer, 2020, Lsu Agcenter

Louisiana Agriculture

No abstract provided.

Genotyping Xylella Fastidiosa In Rabbiteye Blueberry In Louisiana, Usa, Mary Helen Ferguson, Christopher A. Clark, Barbara J. Smith

Faculty Publications

Rabbiteye blueberry (Vaccinium ashei = V. virgatum) comprises much of the blueberry acreage in the southeastern USA states of Louisiana and Mississippi. Three genotypes of X. fastidiosa were identified from rabbiteye blueberry in Louisiana by multilocus sequence typing. A genotype that was found at two orchards, sequence type (ST) 42, was identical to one previously found in southern highbush blueberry in Georgia and two non-blueberry native species in Texas. Two newly identified genotypes shared most alleles with X. fastidiosa strains considered, like ST 42, to be part of a group that is believed to have resulted from recombination between X. …

Adaptive Responses To Maternal Nutrient Restriction Alter Placental Transport In Ewes, Ashley K. Edwards, Sorin M. Mcknight, Katharine Askelson, Jason R. Mcknight, Kathrin A. Dunlap, M. Carey Satterfield

Faculty Publications

Introduction: Maternal nutrient partitioning, uteroplacental blood flow, transporter activity, and fetoplacental metabolism mediate nutrient delivery to the fetus. Inadequate availability or delivery of nutrients results in intrauterine growth restriction (IUGR), a leading cause of neonatal morbidity and mortality. Maternal nutrient restriction can result in IUGR, but only in an unforeseeable subset of individuals. Methods: To elucidate potential mechanisms regulating fetal nutrient availability, singleton sheep pregnancies were generated by embryo transfer. Pregnant ewes received either a 50% NRC (NR; n = 24) or 100% NRC (n = 7) diet from gestational Day 35 until necropsy on Day 125. Maternal weight did …

Phylogeography Of The Variable Antshrike (Thamnophilus Caerulescens), A South American Passerine Distributed Along Multiple Environmental Gradients, Sergio D. Bolívar-Leguizamón, Luís F. Silveira, Elizabeth P. Derryberry, Robb T. Brumfield, Gustavo A. Bravo

Faculty Publications

© 2020 Elsevier Inc. The Neotropics show a wealth of distributional patterns shared by many co-distributed species. A distinctive pattern is the so-called “circum-Amazonian distribution,” which is observed in species that do not occur in Amazonia but rather along a belt of forested habitats spanning south and east of Amazonia, the Andean foothills, and often into the Venezuelan Coastal Range and the Tepuis. Although this pattern is widespread across animals and plants, its underlying biogeographic mechanisms remain poorly understood. The Variable Antshrike (Thamnophilus caerulescens) is a sexually dimorphic suboscine passerine that exhibits extreme plumage variation and occurs along the southern …

Effects Of Hurricane Harvey On The Trophic Status Of Juvenile Sport Fishes (Cynoscion Nebulosus, Sciaenops Ocellatus) In An Estuarine Nursery, Philip Matich, Kaya B. Moore, Jeffrey D. Plumlee

Faculty Publications

Understanding the implications of environmental disturbance is of growing importance as climate change and extreme weather events increasingly threaten estuaries and other coastal ecosystems. Among species at risk in estuarine habitats, sport fishes are of particular interest to conservation and management agencies, because of their ecological and economic value. Here, we evaluate the effects of Hurricane Harvey on the abundance, diet, and body condition of age-0 red drum (Sciaenops ocellatus) and spotted seatrout (Cynoscion nebulosus) in Powderhorn Lake, a nearshore estuary in Texas, USA. Catch data from seines indicated that the abundances of age-0 red drum and spotted seatrout were …

Intermittent Fasting And Metabolic Health: From Religious Fast To Time-Restricted Feeding, Kristin K. Hoddy, Kara L. Marlatt, Hatice Çetinkaya, Eric Ravussin

Clinical Research Faculty Publications

Over the past 10 to 15 years, intermittent fasting has emerged as an unconventional approach to reduce body weight and improve metabolic health beyond simple calorie restriction. In this review, we summarize findings related to Ramadan and Sunnah fasting. We then discuss the role of caloric restriction not only as an intervention for weight control, but importantly, as a strategy for healthy aging and longevity. Finally, we review the four most common intermittent fasting (IF) strategies used to date for weight management and to improve cardiometabolic health. Weight loss is common after IF but does not appear to be different …

Daily Branched-Chain Amino Acid Intake And Risks Of Obesity And Insulin Resistance In Children: A Cross-Sectional Study, Jun Lu, Yuying Gu, Huikun Liu, Leishen Wang, Wei Li, Weiqin Li, Junhong Leng, Shuang Zhang, Lu Qi, Xilin Yang, Gang Hu

Population and Public Health Science Faculty Publications

Objective: This study aimed to investigate the association of daily branched-chain amino acid (BCAA) intake with the risks of obesity and insulin resistance in children of mothers with gestational diabetes mellitus (GDM). Methods: Daily BCAA intake was calculated by using a validated food frequency questionnaire in 996 children of mothers with GDM. The odds ratios (ORs) (95% CI) of childhood obesity and insulin resistance were obtained using logistic regression models. Results: The multivariable-adjusted ORs for overweight and insulin resistance increased across quartiles of daily BCAA intake (P < 0.05 for trend). Multivariable-adjusted ORs for each 1-SD increase in BCAA intake were 1.37 (1.16-1.62) for overweight and 1.19 (1.02-1.38) for insulin resistance. After additional adjustment of children’s daily total energy intake, the OR was still significant for overweight risk but no longer significant for insulin resistance. There were positive associations of daily leucine, isoleucine, and valine intake with the risks for overweight and insulin resistance. Conclusions: Daily BCAA intake was associated with increased risks for overweight and insulin resistance in children of mothers with GDM, but this association was not fully independent of children’s daily energy intake. Restriction in dietary BCAA may help prevent childhood obesity and insulin resistance.

Reshaping An Earthly Paradise: Land Enclosure And Bavarian State Centralization (1779-1835), Gregory Devoe Tomlinson

LSU Doctoral Dissertations

Abstract

The Electoral state of Bavaria was reformed through a comprehensive project of land-based allodification (the creation of a distinction between privileged titles and property designations) through the process of “redemption” beginning in 1799. This process was previously impeded by the strength of landholding estates that included notables and the Catholic Church. In addition, Electoral Bavarian leaders lacked centralized control. Civil servants, known as cameralists, mediated political and economic interactions between these estates. The economy was based on subsistence and the productive capacity of Gutsherrschaft, a manorial system based on regional jurisdiction and rent collection by notables who largely did …

Sperm Decondensation And Male Pronuclear Formation In Bovine Intracytoplasmic Sperm Injection, Lauren Gatenby

LSU Master's Theses

This study assessed the effects both DTT and progesterone have on bovine spermatozoa to induce decondensation or the acrosome reaction in order to facilitate male pronuclear formation after ICSI. Sperm prepared by swim-up in a 5 mM concentration of DTT displayed time dependent morphological changes resulting in decondensation over a 6-hour period. An estimated 90% of treated sperm displayed early changes in morphology after the second hour of incubation. Sperm displaying partial decondensation of the nucleus was estimated as 42% by the 3^rd hour and increased to 62% by the 5^th hour of incubation. Fully decondensed sperm or …