Digital Commons Network^™

Influence Of Salinity, Sunlight, And Sediment On The Toxicity Of Pesticides In Three Non-Target Organisms, Emily Noelle Vebrosky

LSU Doctoral Dissertations

Pesticides used in the United States must undergo registration by the United States Environmental Protection Agency (USEPA), after a multitude of analyses ranging from environmental fate to aquatic toxicological impacts to human risk exposure. Testing varies for each chemical, some requiring more testing than others. In many cases, environmental factors are restricted in the analysis of chemical behavior and organismal testing is limited to larvae. Many pesticides are formulated to breakdown in the environment by means of photolysis, hydrolysis, or oxidation, either to ensure low-persistence, limited transport, or to form the active ingredient (pro-pesticides). Environmental influences on chemical behaviors include …

Partner Gender As A Predictor Of Relationship Satisfaction, Sexual Satisfaction, Relationship Commitment, And Attachment Identity Among Women, Amy Leigh Wright

LSU Doctoral Dissertations

Previous research examining overall relationship satisfaction, relationship commitment, and sexual satisfaction among heterosexual women is well-documented. The theoretical foundation of attachment has also been well-established within relationship research among heterosexual women. However, little to no published reports examine such variables among women currently in same-sex relationships. Furthermore, virtually no reports assess for any differences in attachment identity based on the gender of women’s romantic partners. This study therefore sought to identify any interrelationships between relationship satisfaction, relationship commitment, sexual satisfaction, and attachment identity (measured using the dimensions of avoidance and anxiety) among two groups of women based on their partner’s …

Foreign Aid And Political Stability In Post-Colonial Africa: A Case Study Analysis, Justine Biettron

LSU Master's Theses

Is foreign aid helpful or harmful in African countries? Even though scholars have tried to answer this question for decades, it is still unclear if foreign aid has efficiently helped the African continent to overcome the challenges that arose with the end of Colonization. A priority for the African countries was to reorganize the institutions in order to reestablish autonomous and stable system of governance. An important amount of help for this reconstruction has come from external actors, that have been referred to in the literature as foreign aid. In this paper, I seek to test the relationship between the …

Hydrological Connectivity In Vegetated River Deltas: The Importance Of Patchiness Below A Threshold, Kyle Wright, Matthew Hiatt, Paola Passalacqua

Faculty Publications

No abstract provided.

Controlling Refractionusing Sub-Wavelength Resonators, Yue Chen, Robert Lipton

Faculty Publications

We construct metamaterials from sub-wavelength nonmagnetic resonators and consider the refraction of incoming signals traveling from free space into the metamaterial. We show that the direction of the transmitted signal is a function of its center frequency and bandwidth. The directionality of the transmitted signal and its frequency dependence is shown to be explicitly controlled by sub-wavelength resonances that can be calculated from the geometry of the sub-wavelength scatters. We outline how to construct a medium with both positive and negative index properties across different frequency bands in the near infrared and optical regime.

The Relationship Between The High-Impact Practice Of Communication-Intensive Courses And Undergraduate Degree Completion At A Research University (Ru/Vh), Rebecca Acosta Burdette

LSU Doctoral Dissertations

With a critical public lens on quality student learning inclusive of 21^st century communication skills, and organizational effectiveness à la retention and graduation rates, all amidst budget constraints and increasing enrollments, postsecondary institutions must adopt practices that are both efficient and effective. This study examined the educational practice of Communication‑Intensive (C-I) courses and its influence on the institutional outcome of undergraduate degree completion at a large, public research university.

In this longitudinal study, the researcher applied a quantitative ex post facto research design to analyze six years of official university data on undergraduates who entered the selected university as …

Crash/Near-Crash: Impact Of Secondary Tasks And Real-Time Detection Of Distracted Driving, Peter Ramzy Zaki Bakhit

LSU Doctoral Dissertations

The main goal of this dissertation is to investigate the problem of distracted driving from two different perspectives. First, the identification of possible sources of distraction and their associated crash/near-crash risk. That can assist government officials toward more informed decision-making process, allowing for optimized allocation of available resources to reduce roadway crashes and improve traffic safety. Second, actively counteracting the distracted driving phenomenon by quantitative evaluation of eye glance patterns.

This dissertation research consists of two different parts. The first part provides an in-depth analysis for the increased crash/near-crash risk associated with different secondary task activities using the largest real-world …

Aldosterone Mediated Regulation Of Epithelial Sodium Channel (Enac) Subunits In The Rat Hypothalamus, Natalie J. Mills, Kaustubh Sharma, Masudul Haque, Meagan Moore, Ryoichi Teruyama

Faculty Publications

© 2018 IBRO Current evidence suggests that the epithelial Na + channel (ENaC) in the brain plays a significant role in the development of hypertension. ENaC is present in vasopressin (VP) neurons in the hypothalamus, suggesting that ENaC in VP neurons is involved in the regulation of blood pressure. Our recent study demonstrated that high dietary salt intake caused an increase in the expression and activity of ENaC that were responsible for the more depolarized basal membrane potential in VP neurons. A known regulator of ENaC expression, the mineralocorticoid receptor (MR), is present in VP neurons, suggesting that ENaC expression …

Bipartite Quantum Interactions: Entangling And Information Processing Abilities, Siddhartha Das

LSU Doctoral Dissertations

The aim of this thesis is to advance the theory behind quantum information processing tasks, by deriving fundamental limits on bipartite quantum interactions and dynamics. A bipartite quantum interaction corresponds to an underlying Hamiltonian that governs the physical transformation of a two-body open quantum system. Under such an interaction, the physical transformation of a bipartite quantum system is considered in the presence of a bath, which may be inaccessible to an observer. The goal is to determine entangling abilities of such arbitrary bipartite quantum interactions. Doing so provides fundamental limitations on information processing tasks, including entanglement distillation and secret key …

Thin-Film Block Copolymers (Bcps) Self-Assembly As Versatile Patterning Scheme For Functional Nanomaterials, Le Zhang

LSU Master's Theses

Nanopattern generation is required for building various structural entities in every production process that involves nanostructures. Advancing nanopatterning technologies play an important role in developing and broadening the current nanopatterning technologies to meet up with the ever-demanding requirements in the realm of smaller feature sizes, smoother line-edge roughness (LER) and facile pattern transfer in pursuit of faster computer processors, better electrocatalysts and more compact and intelligent sensors, etc. Conventionally, patterning needs are heavily relied on photolithography, a technique that dominate chip-making industry for more than 50 years. However conventional photolithography is bounded by inherent resolution limits and difficult to be …

Project Narrative: Examining The Interplay Of Experiences Of Participants In An After-School Writing Club, Courtney A. Brown

LSU Doctoral Dissertations

Writing is a vital part of literacy development. It affords the opportunity for the expression and analysis of comprehensive thought, while simultaneously being a modality for unique and creative communication. In order for productive dialogue about the study of writing to be engaged, the contemplation of its many dynamic parts occurring across a diversity of contexts must be considered in such a way that one writing strategy, process, product or environment is not privileged above another. Each constituent part of writing construction contributes meaningfully to the existing body of research for this field, and when carefully disaggregated can offer specific …

Using A Trait-Based Approach To Optimize Mixotrophic Growth Of The Red Microalga Porphyridium Purpureum Towards Fatty Acid Production, Kailin Jiao, Wupeng Xiao, Yuanchao Xu, Xianhai Zeng, Shih Hsin Ho, Edward A. Laws, Yinghua Lu, Xueping Ling, Tuo Shi, Yong Sun, Xing Tang, Lu Lin

Faculty Publications

Background: Organic carbon sources have been reported to simultaneously increase the growth and lipid accumulation in microalgae. However, there have been no studies of the mixotrophic growth of Porphyridium purpureum in organic carbon media. In this study, three organic carbon sources, glucose, sodium acetate, and glycerol were used as substrates for the mixotrophic growth of P. purpureum. Moreover, a novel trait-based approach combined with Generalized Additive Modeling was conducted to determine the dosage of each organic carbon source that optimized the concentration of cell biomass or fatty acid. Results: A 0.50% (w/v) dosage of glucose was optimum for the enhancement …

Fibroblast Growth Factor 21, Adiposity, And Macronutrient Balance In A Healthy, Pregnant Population With Overweight And Obesity, Elizabeth F. Sutton, Christopher D. Morrison, Jacqueline M. Stephens, Leanne M. Redman

Faculty Publications

© 2018, © 2018 Taylor & Francis. Aim of the study: The regulation and actions of fibroblast growth factor 21 (FGF21) are responsive to energy status and macronutrient balance, and investigations of FGF21 in normal pregnancy, which could be informative for FGF21 biology, are seldom. The goal of our study was to examine FGF21 levels in a contemporary healthy, pregnant population. Methods: We phenotyped 43 women with overweight and obesity during pregnancy for weight, body composition, and fasting blood. Serum FGF21 was measured during the first and third trimesters. Placentas were collected at delivery. Results: Maternal FGF21 concentrations were positively …

F18rs Sgcr No. 37 (Referenda Postponement), Jordan K. Landry

Student Senate Enrolled Legislation

No abstract provided.

Lsu Research Fall 2018, Louisiana State University And Agricultural & Mechanical College

Research Magazine

LSU Research is published annually by the Office of Research & Economic Development, Louisiana State University.

Particulate Matter Containing Environmentally Persistent Free Radicals Induces Ahrdependent Cytokine And Reactive Oxygen Species Production In Human Bronchial Epithelial Cells, Ashlyn C. Harmon, Valeria Y. Hebert, Stephania A. Cormier, Balamurugan Subramanian, James R. Reed, Wayne L. Backes, Tammy R. Dugas

Faculty Publications

© 2018 Harmon 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. Particulate matter (PM) is emitted during the combustion of fuels and wastes. PM exposure exacerbates pulmonary diseases, and the mechanism may involve oxidative stress. At lower combustion temperatures such as occurs in the cool zone of a flame, aromatic compounds chemisorb to the surface of metal-oxide-containing PM, resulting in the formation of surface-stabilized environmentally persistent free radicals (EPFR). Prior studies showed …

Louisiana Agriculture Fall, 2018, Lsu Agcenter

Louisiana Agriculture

No abstract provided.

Louisiana Agriculture Fall, 2018, Lsu Agcenter

Louisiana Agriculture

No abstract provided.

Measurement And Modeling Of The Spatiotemporal Dynamics Of Beach Surface Moisture Content, Phillip P. Schmutz, Steven L. Namikas

Faculty Publications

The spatiotemporal dynamics of surface moisture exert a significant influence on the operation of aeolian transport systems at many beaches. However, we currently lack the detailed understanding of variability in surface moisture required to incorporate it into aeolian models. This problem is addressed here through direct measurements and simulation modeling of beach surface moisture over a twelve-day period, and through quantification of the relative contributions of evaporation, condensation and groundwater inputs to surface moisture. It was found that the beach surface can be characterized spatially in terms of three moisture zones: a consistently dry zone (40%). The relative influence of …

Enhancing The Durability And The Service Life Of Asphalt Pavements Through Innovative Light-Induced Self-Healing Materials, Marwa Hassan

Publications

The objective of this study was to evaluate the efficiency of a new generation of Ultraviolet (UV) light-induced selfhealing polymers in enhancing the durability and self-healing properties of asphalt mixtures. Self-healing polymers were successfully synthesized in the laboratory and were characterized using Fourier Transform Infrared Spectroscopy (FTIR). In addition, Thermogravimetric Analysis (TGA) results showed that the synthesized polymers achieved the required thermal stability to resist asphalt mixture production processes. Viscosity results showed that addition of 5% Recycled Asphalt Shingle (RAS) and/or 20% Reclaimed Asphalt Pavement (RAP) caused an increase in the viscosity of the binder blends. However, a reduction in …

In-Situ Mechanical Characterization For Compacted Aggregates, Douglas Cortes, Paola Bandini

Publications

The evaluation of compacted unbound aggregate layers is perhaps the most common undertaking in transportation-related projects. The assessment of compaction compliance in engineered fills, subgrades, subbases, and bases in roadways and railways is central to ensure longevity of ground transportation infrastructure. In many cases, premature failures in roadways that originate in the unbound aggregate layers can be traced back to inadequate compaction. These failures are preventable, provided the problem areas can be identified by a suitable field test during construction. The most widely used method for compaction assessment during construction is the nuclear density gauge (NDG) test. While the device …

Bridge Inspecting With Unmanned Aerial Vehicles R&D, Paul Darby, Vijaya Gopu

Publications

The project achieves through research including literature, on site interviews, and experimentation: 1) a recommendation for a UAV-based system to practically assist in routine bridge inspection work in the State of Louisiana, 2) the identification and description of advantages, disadvantages, and limitations in the use of UAVs for routing bridge inspection work in Louisiana, and 3) provided recommendations for future work. The Yuneec H520 aircraft and its E90 camera are recommended, as is the need for a boat to be included as part of the system. The recommended system has advantages in reaching portions of the bridge that are difficult …

Faculty Senate Meeting Minutes September 20, 2018, Faculty Senate

LSU Faculty Senate Publications

Faculty Senate Meeting Minutes September 20, 2018

Comparison Of Thermally Actuated Retro-Diels-Alder Release Groups For Nanoparticle Based Nucleic Acid Delivery, Mohammad Abu-Laban, Raju R. Kumal, Jonathan Casey, Jeff Becca, Daniel Lamaster, Carlos N. Pacheco, Dan G. Sykes, Lasse Jensen, Louis H. Haber, Daniel J. Hayes

Faculty Publications

© 2018 Elsevier Inc. The present study explores alternate pericyclic chemistries for tethering amine-terminal biomolecules onto silver nanoparticles. Employing the versatile tool of the retro-Diels-Alder (rDA) reaction, three thermally-labile cycloadducts are constructed that cleave at variable temperature ranges. While the reaction between furan and maleimide has widely been reported, the current study also evaluates the reverse reaction kinetics between thiophene-maleimide, and pyrrole-maleimide cycloadducts. Density Functional Theorem (DFT) calculations used to model and plan the experiments, predict energy barriers for the thiophene-maleimide reverse reaction to be greatest, and the pyrrole-maleimide barriers the lowest. Based on the computational analyses, it is projected …

Transgene Pyramiding Of Salt Responsive Protein 3-1 (Sasrp3-1) And Savhac1 From Spartina Alterniflora L. Enhances Salt Tolerance In Rice, Hanamareddy Biradar, Ratna Karan, Prasanta K. Subudhi

Faculty Publications

The transgenic technology using a single gene has been widely used for crop improvement. But the transgenic pyramiding of multiple genes, a promising alternative especially for enhancing complexly inherited abiotic stress tolerance, has received little attention. Here, we developed and evaluated transgenic rice lines with a single Salt Responsive Protein 3-1 (SaSRP3-1) gene as well as pyramids with two-genes SaSRP3-1 and Vacuolar H+-ATPase subunit c1 (SaVHAc1) derived from a halophyte grass Spartina alterniflora L. for salt tolerance at seedling, vegetative, and reproductive stages. The overexpression of this novel gene SaSRP3-1 resulted in significantly better growth of E. coli with the …

Edwardsiella Ictaluri Type Iii Secretion System (T3ss) Effector Esen Is A Phosphothreonine Lyase That Inactivates Erk1/2, Lidiya P. Dubytska, Ronald L. Thune

Faculty Publications

© The authors 2018. EseN is a type III secretion system (T3SS) effector that is encoded on the Edwardsiella ictaluri chromosome and is homologous to a family of T3SS effector proteins with phosphothreonine lyase (PTL) activity, including OspF from Shigella and SpvC from Salmonella. A yeast-2-hybrid system was used to identify the major vault protein (MVP) as a specific host-cell binding partner for EseN, and the proximity ligation assay (PLA) confirmed the interaction. Similar to other pathogens, E. ictaluri invasion activates extracellular signal-regulated kinases 1 and 2 (ERK1/2) early in the infection, which are subsequently inactivated by EseN. Structurally, EseN …

Relief Of The Dma1-Mediated Checkpoint Requires Dma1 Autoubiquitination And Dynamic Localization, Christine M. Jones, Jun Song Chen, Alyssa E. Johnson, Zachary C. Elmore, Sierra N. Cullati, Janel R. Beckley, Kathleen L. Gould

Faculty Publications

© 2018 Jones, Chen, et al. Chromosome segregation and cell division are coupled to prevent aneuploidy and cell death. In the fission yeast Schizosaccharomyces pombe, the septation initiation network (SIN) promotes cytokinesis, but upon mitotic checkpoint activation, the SIN is actively inhibited to prevent cytokinesis from occurring before chromosomes have safely segregated. SIN inhibition during the mitotic checkpoint is mediated by the E3 ubiquitin ligase Dma1. Dma1 binds to the CK1-phosphorylated SIN scaffold protein Sid4 at the spindle pole body (SPB), and ubiquitinates it. Sid4 ubiquitination antagonizes the SPB localization of the Polo-like kinase Plo1, the major SIN activator, so …

Proximity Ligation Assay To Study Protein-Protein Interactions Of Proteins On Two Different Cells, Rushikesh Sable, Nithya Jambunathan, Sitanshu Singh, Sandeep Pallerla, Konstantin G. Kousoulas, Seetharama Jois

Faculty Publications

© 2018 Future Science. All rights reserved. Protein-protein interactions (PPI) by homo-, hetero- or oligo-merization in the cellular environment regulate cellular processes. PPI can be inhibited by antibodies, small molecules or peptides, and this inhibition has therapeutic value. A recently developed method, the proximity ligation assay (PLA), provides detection of PPI in the cellular environment. However, most applications using this assay are for proteins expressed in the same cell. We employ PLA for the first time to study PPI of cell surface proteins on two different cells. Inhibition of PPI using a peptide inhibitor is also quantified using this assay; …

Effective Maxwell’S Equations For Perfectly Conducting Split Ring Resonators, Robert Lipton, Ben Schweizer

Faculty Publications

We analyze the time harmonic Maxwell’s equations in a geometry containing perfectly conducting split rings. We derive the homogenization limit in which the typical size η of the rings tends to zero. The split rings act as resonators and the assembly can act, effectively, as a magnetically active material. The frequency dependent effective permeability of the medium can be large and/or negative.

Correction To: Emplaced Social Vulnerability To Technological Disasters: Southeast Louisiana And The Bp Deepwater Horizon Oil Spill (Population And Environment, (2017), 38, 3, (217-241), 10.1007/S11111-016-0257-8), Michael R. Cope, Tim Slack

Faculty Publications

The original version of this article inadvertently did not include the following acknowledgement of funding: Funding information This research was made possible by a grant from The Gulf of Mexico Research Initiative (GoMRI). Data are publicly available through the Gulf of Mexico Research Initiative Information & Data Cooperative (GRIIDC) at https://data.gulfresearchinitiative.org (doi: https://doi. org/10.7266/N7T72FDS, https://doi.org/10.7266/N7PG1PP2, https://doi.org/10.7266/N7JQ0XZB, https://doi.org/10.7266/N7DZ068V).