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Louisiana State University

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Lsu Research Fall 2021, Louisiana State University And Agricultural And Mechanical College Oct 2021

Lsu Research Fall 2021, Louisiana State University And Agricultural And Mechanical College

Research Magazine

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

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Placental Adaptation To Maternal Malnutrition, M. Carey Satterfield, Ashley K. Edwards, Fuller W. Bazer, Kathrin A. Dunlap, Chelsie B. Steinhauser, Guoyao Wu Oct 2021

Placental Adaptation To Maternal Malnutrition, M. Carey Satterfield, Ashley K. Edwards, Fuller W. Bazer, Kathrin A. Dunlap, Chelsie B. Steinhauser, Guoyao Wu

Faculty Publications

Maternal malnutrition gives rise to both short- and long-term consequences for the survival and health of the offspring. As the intermediary between mother and fetus, the placenta has the potential to interpret environmental signals, such as nutrient availability, and adapt to support fetal growth and development. While this potential is present, it is clear that at times placental adaptation fails to occur resulting in poor pregnancy outcomes. This review will focus on placental responses to maternal undernutrition related to changes in placental vascularization and hemodynamics and placental nutrient transport systems across species. While much of the available literature describes placental …

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Genetic Knockouts Indicate That The Abcc2 Protein In The Bollworm Helicoverpa Zea Is Not A Major Receptor For The Cry1ac Insecticidal Protein, Omaththage P. Perera, Nathan S. Little, Heba Abdelgaffar, Juan Luis Jurat-Fuentes, Gadi V.P. Reddy Oct 2021

Genetic Knockouts Indicate That The Abcc2 Protein In The Bollworm Helicoverpa Zea Is Not A Major Receptor For The Cry1ac Insecticidal Protein, Omaththage P. Perera, Nathan S. Little, Heba Abdelgaffar, Juan Luis Jurat-Fuentes, Gadi V.P. Reddy

Faculty Publications

Members of the insect ATP binding cassette transporter subfamily C2 (ABCC2) in several moth species are known as receptors for the Cry1Ac insecticidal protein from Bacillus thuringiensis (Bt). Mutations that abolish the functional domains of ABCC2 are known to cause resistance to Cry1Ac, although the reported levels of resistance vary widely depending on insect species. In this study, the function of the ABCC2 gene as a putative Cry1Ac receptor in Helicoverpa zea, a major pest of over 300 crops, was evaluated using CRISPR/Cas9 to progressively eliminate different functional ABCC2 domains. Results from bioassays with edited insect lines support that mutations …

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Stability Analysis Using Generalized Sup-Delay Inequalities, Frederic Mazenc, Michael Malisoff, Miroslav Krstic Oct 2021

Stability Analysis Using Generalized Sup-Delay Inequalities, Frederic Mazenc, Michael Malisoff, Miroslav Krstic

Faculty Publications

We provide a new generalization of a recent trajectory-based approach for proving global asymptotic stability properties, using new sup-delay inequalities. Our generalization eliminates the usual contractivity requirement from previous sup-delay inequality approaches. We show how the requirements of our generalization hold under less restrictive Halanay's conditions than those that were previously reported. While the usual Halanay's inequality requires the decay rate to exceed the gain, our less restrictive conditions allow the gain to exceed the decay rate. We apply our work to systems with switching delays and to a continuous-discrete system.

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Leptin Receptor Signaling Is Required For Intact Hypoglycemic Counterregulation: A Study In Male Zucker Rats, Christopher D. Morrison, Marina A. Duvall, Cristal M. Hill, Redin A. Spann, David H. Mcdougal Oct 2021

Leptin Receptor Signaling Is Required For Intact Hypoglycemic Counterregulation: A Study In Male Zucker Rats, Christopher D. Morrison, Marina A. Duvall, Cristal M. Hill, Redin A. Spann, David H. Mcdougal

Division of Basic Science Faculty Publications

Hypoglycemia is a major barrier to clinical management of persons with diabetes. Emerging evidence supports a role for leptin in gating hypoglycemic counterregulation. This work demonstrates that male leptin receptor null, Zucker (fa/fa), rats display severe impairments in hypoglycemic counterregulation. Thus, augmenting leptin levels may have clinical utility for preventing hypoglycemia.

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Nest Survival Of Seaside Sparrows (Ammospiza Maritima) In The Wake Of The Deepwater Horizon Oil Spill, Megan E. Hart, Anna Perez-Umphrey, Philip C. Stouffer, Christine Bergeon Burns, Andrea Bonisoli-Alquati, Sabrina S. Taylor, Stefan Woltmann Oct 2021

Nest Survival Of Seaside Sparrows (Ammospiza Maritima) In The Wake Of The Deepwater Horizon Oil Spill, Megan E. Hart, Anna Perez-Umphrey, Philip C. Stouffer, Christine Bergeon Burns, Andrea Bonisoli-Alquati, Sabrina S. Taylor, Stefan Woltmann

Faculty Publications

In 2010, the Deepwater Horizon oil spill released an estimated 4.9 million barrels of oil into the Gulf of Mexico, damaging coastal ecosystems. Seaside Sparrows (Ammospiza maritima)—a year-round resident of Gulf Coast salt marshes—were exposed to oil, as shown by published isotopic and molecular analyses, but fitness consequences have not been clarified. We monitored nests around two bays in Plaquemines Parish, Louisiana, USA from 2012–2017 to assess possible impacts on the nesting biology of Seaside Sparrows. A majority of nests failed (76% of known-fate nests, N = 252 nests, 3521 exposure-days) during our study, and predation was the main cause …

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Effect Of Aerobic Exercise-Induced Weight Loss On The Components Of Daily Energy Expenditure, Nicholas T. Broskey, Corby K. Martin, Jeffrey H. Burton, Timothy S. Church, Eric Ravussin, Leanne M. Redman Oct 2021

Effect Of Aerobic Exercise-Induced Weight Loss On The Components Of Daily Energy Expenditure, Nicholas T. Broskey, Corby K. Martin, Jeffrey H. Burton, Timothy S. Church, Eric Ravussin, Leanne M. Redman

Clinical Research Faculty Publications

Introduction Exercise usually results in less weight loss than expected. This suggests increased energy intake and/or deceased expenditure counteract the energy deficit induced by exercise. The aim of this study was to evaluate changes in components of daily energy expenditure (doubly labeled water and room calorimetry) after 24 wk of exercise training with two doses of aerobic exercise. Methods This was an ancillary study in 42 (29 women, 13 men) sedentary, middle-age (47.8 ± 12.5 yr) individuals with obesity (35 ± 3.7 kg·m-2) enrolled in the Examination of Mechanisms of Exercise-induced Weight Compensation study. Subjects were randomized to three groups: …

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Effect Of 2-Year Caloric Restriction On Organ And Tissue Size In Nonobese 21- To 50-Year-Old Adults In A Randomized Clinical Trial- To Calerie Study, Wei Shen, Jun Chen, Jane Zhou, Corby K. Martin, Eric Ravussin, Leanne M. Redman Oct 2021

Effect Of 2-Year Caloric Restriction On Organ And Tissue Size In Nonobese 21- To 50-Year-Old Adults In A Randomized Clinical Trial- To Calerie Study, Wei Shen, Jun Chen, Jane Zhou, Corby K. Martin, Eric Ravussin, Leanne M. Redman

Clinical Research Faculty Publications

Background: Sustained calorie restriction (CR) promises to extend the lifespan. The effect of CR on changes in body mass across tissues and organs is unclear. Objectives: We used whole-body MRI to evaluate the effect of 2 y of CR on changes in body composition. Methods: In an ancillary study of the Comprehensive Assessment of Long-term Effects of Reducing Intake of Energy (CALERIE) trial, 43 healthy adults [25-50 y; BMI (kg/m2): 22-28] randomly assigned to 25% CR (n = 28) or ad libitum (AL) eating (n = 15) underwent whole-body MRI at baseline and month 24 to measure adipose tissue in …

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Analysis Of A New Multispecies Tumor Growth Model Coupling 3d Phase-Fields With A 1d Vascular Network, Marvin Fritz, Prashant K. Jha, Tobias Köppl, J. Tinsley Oden, Barbara Wohlmuth Oct 2021

Analysis Of A New Multispecies Tumor Growth Model Coupling 3d Phase-Fields With A 1d Vascular Network, Marvin Fritz, Prashant K. Jha, Tobias Köppl, J. Tinsley Oden, Barbara Wohlmuth

Faculty Publications

In this work, we present and analyze a mathematical model for tumor growth incorporating ECM erosion, interstitial flow, and the effect of vascular flow and nutrient transport. The model is of phase-field or diffused-interface type in which multiple phases of cell species and other constituents are separated by smooth evolving interfaces. The model involves a mesoscale version of Darcy's law to capture the flow mechanism in the tissue matrix. Modeling flow and transport processes in the vasculature supplying the healthy and cancerous tissue, one-dimensional (1D) equations are considered. Since the models governing the transport and flow processes are defined together …

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Modeling And Simulation Of Vascular Tumors Embedded In Evolving Capillary Networks, Marvin Fritz, Prashant K. Jha, Tobias Köppl, J. Tinsley Oden, Andreas Wagner, Barbara Wohlmuth Oct 2021

Modeling And Simulation Of Vascular Tumors Embedded In Evolving Capillary Networks, Marvin Fritz, Prashant K. Jha, Tobias Köppl, J. Tinsley Oden, Andreas Wagner, Barbara Wohlmuth

Faculty Publications

In this work, we present a coupled 3D–1D model of solid tumor growth within a dynamically changing vascular network to facilitate realistic simulations of angiogenesis. Additionally, the model includes erosion of the extracellular matrix, interstitial flow, and coupled flow in blood vessels and tissue. We employ continuum mixture theory with stochastic Cahn–Hilliard type phase-field models of tumor growth. The interstitial flow is governed by a mesoscale version of Darcy's law. The flow in the blood vessels is controlled by Poiseuille flow, and Starling's law is applied to model the mass transfer in and out of blood vessels. The evolution of …

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Dynamin-Related Protein 1 Regulates Substrate Oxidation In Skeletal Muscle By Stabilizing Cellular And Mitochondrial Calcium Dynamics, William T. King, Christopher L. Axelrod, Elizabeth R.M. Zunica, Robert C. Noland, Gangarao Davuluri, Hisashi Fujioka, Bernard Tandler, Kathryn Pergola, Gerlinda E. Hermann, Richard C. Rogers, Sandra López-Domènech, Wagner S. Dantas, Krisztian Stadler, Charles L. Hoppel, John P. Kirwan Oct 2021

Dynamin-Related Protein 1 Regulates Substrate Oxidation In Skeletal Muscle By Stabilizing Cellular And Mitochondrial Calcium Dynamics, William T. King, Christopher L. Axelrod, Elizabeth R.M. Zunica, Robert C. Noland, Gangarao Davuluri, Hisashi Fujioka, Bernard Tandler, Kathryn Pergola, Gerlinda E. Hermann, Richard C. Rogers, Sandra López-Domènech, Wagner S. Dantas, Krisztian Stadler, Charles L. Hoppel, John P. Kirwan

Division of Basic Science Faculty Publications

Mitochondria undergo continuous cycles of fission and fusion to promote inheritance, regulate quality control, and mitigate organelle stress. More recently, this process of mitochondrial dynamics has been demonstrated to be highly sensitive to nutrient supply, ultimately conferring bioenergetic plasticity to the organelle. However, whether regulators of mitochondrial dynamics play a causative role in nutrient regulation remains unclear. In this study, we generated a cellular loss-of-function model for dynamin-related protein 1 (DRP1), the primary regulator of outer membrane mitochondrial fission. Loss of DRP1 (shDRP1) resulted in extensive ultrastructural and functional remodeling of mitochondria, characterized by pleomorphic enlargement, increased electron density of …

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Practical Application Of In Vivo Mri-Based Brown Adipose Tissue Measurements In Infants, Emily W. Flanagan, Abby D. Altazan, Owen T. Carmichael, Houchun H. Hu, Leanne M. Redman Oct 2021

Practical Application Of In Vivo Mri-Based Brown Adipose Tissue Measurements In Infants, Emily W. Flanagan, Abby D. Altazan, Owen T. Carmichael, Houchun H. Hu, Leanne M. Redman

Clinical Research Faculty Publications

Objective: The role of brown adipose tissue (BAT) in infant metabolism remains poorly understood, primarily because of the inherent limitation of positron emission tomography/computed tomography imaging to measure BAT, which is not suitable for infants. The aims of this method development study were to assess the feasibility, intra-rater reliability, interscan repeatability, and physiological relevance of measuring BAT in infants using magnetic resonance imaging (MRI). Methods: A total of 10 nonsedated infants (mean age, 22.6 [1.3] days old) completed two 3-T MRI exams using chemical-shift-encoded water-fat scans 6.2 (2.8) days apart. Candidate BAT voxels in the supraclavicular region were identified based …

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Increases In Adiposity Among Children And Adolescents Over Time: Moving Beyond Bmi, Amanda E. Staiano, Peter T. Katzmarzyk Oct 2021

Increases In Adiposity Among Children And Adolescents Over Time: Moving Beyond Bmi, Amanda E. Staiano, Peter T. Katzmarzyk

Population and Public Health Science Faculty Publications

No abstract provided.

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Insights Into The Tectonostratigraphic Setting Of The Southern Appalachians During The Blountian Tectophase From An Integrated Geochemical Analysis Of Magmatic Phenocrysts In The Ordovician Deicke K-Bentonite, Achim D. Herrmann, John T. Haynes, Richard M. Robinet, Jürgen Konzett, Norlene R. Emerson Oct 2021

Insights Into The Tectonostratigraphic Setting Of The Southern Appalachians During The Blountian Tectophase From An Integrated Geochemical Analysis Of Magmatic Phenocrysts In The Ordovician Deicke K-Bentonite, Achim D. Herrmann, John T. Haynes, Richard M. Robinet, Jürgen Konzett, Norlene R. Emerson

Faculty Publications

We evaluate competing hypotheses regarding tectonic models of the early Taconic Orogeny in the Southern Appalachians during the Blountian tectophase with new geochemical data obtained from analyses of apatite and zircon phenocrysts, and melt and mineral inclusions therein, from the Ordovician Deicke K-bentonite (453.35 ± 0.10 Ma). Apatite geochemistry confirms that samples from different locations represent the same eruptive event, and zircon geochemistry and U[sbnd]Pb geochronology (including several Grenville-age inherited detrital cores) confirm an evolved magma of continental-arc composition, with the trace-metal geochemistry of magmatic Taconic-age rims on Deicke zircons pointing to a provenance of continental crustal igneous rock melts, …

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Atlas Of Receptor Genes Expressed By The Bovine Morula And Corresponding Ligand-Related Genes Expressed By Uterine Endometrium, Lei Sang, Yao Xiao, Zongliang Jiang, Niamh Forde, Xiuchun Cindy Tian, Patrick Lonergan, Peter J. Hansen Oct 2021

Atlas Of Receptor Genes Expressed By The Bovine Morula And Corresponding Ligand-Related Genes Expressed By Uterine Endometrium, Lei Sang, Yao Xiao, Zongliang Jiang, Niamh Forde, Xiuchun Cindy Tian, Patrick Lonergan, Peter J. Hansen

Faculty Publications

Regulation of the mammalian embryo involves cell-signaling molecules produced by the maternal oviduct and endometrium. Here, datasets on the transcriptome of the gestational Days 5 and 6 bovine morula and Day 5 maternal endometrium were examined to identify receptor genes expressed by the morula and expression of the corresponding ligand-related genes in the endometrium. A total of 175 receptor genes were identified in the morula, including 48 encoding for growth factors or WNT signaling molecules, 25 for cytokines and chemokines, 35 involved in juxtacrine and matricellular signaling and 25 encoding for receptors for small molecules. Some of the highly-expressed pairs …

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Robotic Communications For 5g And Beyond: Challenges And Research Opportunities, Yuanwei Liu, Xiao Liu, Xinyu Gao, Xidong Mu, Xiangwei Zhou, Octavia A. Dobre, H. Vincent Poor Oct 2021

Robotic Communications For 5g And Beyond: Challenges And Research Opportunities, Yuanwei Liu, Xiao Liu, Xinyu Gao, Xidong Mu, Xiangwei Zhou, Octavia A. Dobre, H. Vincent Poor

Faculty Publications

The ongoing surge in applications of robotics brings both opportunities and challenges for the fifth-generation (5G) and beyond (B5G) of communication networks. This article focuses on 5G/B5G-enabled terrestrial robotic communications with an emphasis on distinct characteristics of such communications. First, signal and spatial modeling for robotic communications are presented. To elaborate further, both the benefits and challenges derived from robots' mobility are discussed. As a further advance, a novel simultaneous localization and radio mapping (SLARM) framework is proposed for integrating localization and communications into robotic networks. Furthermore, dynamic trajectory design and resource allocation for both indoor and outdoor robots are …

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Hydrophobically Modified Polypeptoids And Uses Thereof, Donghui Zhang, Vijay T. John, Yueheng Zhang, Sunting Xuan Sep 2021

Hydrophobically Modified Polypeptoids And Uses Thereof, Donghui Zhang, Vijay T. John, Yueheng Zhang, Sunting Xuan

College of Science Patents

A variety of hydrophobically modified polypeptoids are provided. The hydrophobically modified polypeptoids can include a polyamide backbone having a random copolymer of two or more different types of repeat units, where one or more of the repeat units have nitrogen atom having a hydrophobic substituent attached thereto. Methods of making the hydrophobically modified polypeptoids are also provided, as well as uses of the hydrophobically modified polypeptoids, for example in liposomal drug delivery.

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Zeta Potential Measurements For Surface Modification Of Plastic Substrates For Nanofluidic Biosensors, Qinhan Liu Sep 2021

Zeta Potential Measurements For Surface Modification Of Plastic Substrates For Nanofluidic Biosensors, Qinhan Liu

LSU Master's Theses

Polymeric materials have revealed their great potentials in micro- and nano- fluidic devices for biosensing. Their advantages include low cost, various physicochemical properties, well-developed fabrication, and surface modification protocols comparing with traditional materials such as silicon or glass. Surface modification consists an essential step in fabrication of polymer-based biosensors. A proper characterization is required to justify the effectiveness of modifications on polymer surface. For nanofluidic devices, special phenomena such as overlapped electrical double layer, ion rectification and electroosmosis flow can dominate the behavior of single molcules. The concept of surface charge density plays a key role in nanofluidic devices due …

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A Modular Open-Technology Device To Measure And Adjust Concentration Of Sperm Samples For Cryopreservation, Nikolas C. Zuchowicz Sep 2021

A Modular Open-Technology Device To Measure And Adjust Concentration Of Sperm Samples For Cryopreservation, Nikolas C. Zuchowicz

LSU Master's Theses

Repositories for aquatic germplasm can safeguard the genetic diversity of species of interest to aquaculture, research, and conservation. The development of such repositories is impeded by a lack of standardization both within laboratories and across the research community. Protocols for cryopreservation are often developed ad hoc and without close attention to variables, such as sperm concentration, that strongly affect the success and consistency of cryopreservation. The wide dissemination and use of specialized tools and devices can improve processing reliability, provide data logging, produce custom hardware to address unique problems, and save costs, time, and labor. The goal of the present …

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Dosimetric Validation Of A System To Treat Moving Tumors Using Scanned Ion Beams That Are Synchronized With Anatomical Motion, Michelle Lis, Wayne Newhauser, Marco Donetti, Moritz Wolf, Timo Steinsberger, Athena Paz, Christian Graeff Sep 2021

Dosimetric Validation Of A System To Treat Moving Tumors Using Scanned Ion Beams That Are Synchronized With Anatomical Motion, Michelle Lis, Wayne Newhauser, Marco Donetti, Moritz Wolf, Timo Steinsberger, Athena Paz, Christian Graeff

Faculty Publications

Purpose: The purpose of this study was to validate the dosimetric performance of scanned ion beam deliveries with motion-synchronization to heterogenous targets. Methods: A 4D library of treatment plans, comprised of up to 10 3D sub-plans, was created with robust and conventional 4D optimization methods. Each sub-plan corresponded to one phase of periodic target motion. The plan libraries were delivered to a test phantom, comprising plastic slabs, dosimeters, and heterogenous phantoms. This phantom emulated range changes that occur when treating moving tumors. Similar treatment plans, but without motion synchronization, were also delivered to a test phantom with a stationary target …

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Blue Carbon In South Florida's Mangroves: The Role Of Large Roots And Necromass, Zoë I. Shribman Sep 2021

Blue Carbon In South Florida's Mangroves: The Role Of Large Roots And Necromass, Zoë I. Shribman

LSU Master's Theses

Blue carbon sequestration and storage in mangroves largely result from belowground biomass allocation in response to flooded anaerobic soil conditions and nutrient availability. Biomass allocation to belowground roots is a major driver of mangrove soil formation and organic matter accumulation leading to blue carbon storage potential. Belowground biomass sampling in mangroves is labor intensive, limiting data availability on biomass stocks, particularly for large roots (>20 mm diameter) and necromass (dead roots). The mangrove nutrient model (NUMAN) uses mostly literature values to parameterize a soil cohort approach to simulate depth distribution of root mass and organic carbon concentration. We evaluated …

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Resistance Allele Frequencies To Cry1ab And Vip3aa20, And Performance Of Cry1a.105/Cry2ab2 Susceptible And Single/Dual-Gene Resistant Corn Earworm On Non-Bt And Low Concentrations Of Bt Diet, Shucong Lin Sep 2021

Resistance Allele Frequencies To Cry1ab And Vip3aa20, And Performance Of Cry1a.105/Cry2ab2 Susceptible And Single/Dual-Gene Resistant Corn Earworm On Non-Bt And Low Concentrations Of Bt Diet, Shucong Lin

LSU Master's Theses

Corn earworm, Helicoverpa zea (Boddie), is an important agricultural pest and a target species of Bt corn and Bt cotton. Recently, this pest in the U.S. has developed resistance to Cry1/Cry2 corn and cotton. The objectives of this study were to 1) estimate the frequencies of resistance allele to Cry1Ab and Vip3Aa20 proteins in Louisiana populations of H. zea; 2) determine if Cry1A.105/Cry2Ab2 single/dual-gene resistance in H. zea is associated with fitness costs; and 3) investigate the effect of three low concentrations of mixed Cry1A.105/Cry2Ab2 proteins on the growth, development, and reproduction of two known Bt-susceptible strains and six …

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Influence Of Planting Date, Maturity Group, Harvest Aids And Fungicide Application On Soybean (Glycine Max (L.) Seed Quality, Ana Priscila Campos Sep 2021

Influence Of Planting Date, Maturity Group, Harvest Aids And Fungicide Application On Soybean (Glycine Max (L.) Seed Quality, Ana Priscila Campos

LSU Master's Theses

Field studies evaluated the influence of planting date, maturity group, and harvest timing on soybean yield and seed quality at the LSU AgCenter Northeast (NERS), Macon Ridge, and Dean Lee Research Stations in 2018-2020. In addition, the influence of harvest aid and fungicide application on seed quality impact from delayed harvest and environment was investigated at NERS in 2019 and 2020 in both field and environmentally controlled growth chambers. Soybean yield was maximized when maturity group IV and V soybean varieties were planted between Mid-April and Mid-May. Earlier and later planting dates did not result in maximized yield. Planting date …

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System Controls Of Coastal And Open Ocean Oxygen Depletion, Grant C. Pitcher, Arturo Aguirre-Velarde, Denise Breitburg, Jorge Cardich, Jacob Carstensen, Daniel J. Conley, Boris Dewitte, Anja Engel, Dante Espinoza-Morriberón, Georgina Flores, Véronique Garçon, Michelle Graco, Marilaure Grégoire, Dimitri Gutiérrez, José Martin Hernandez-Ayon, Huai Hsuan May Huang, Kirsten Isensee, María Elena Jacinto, Lisa Levin, Alberto Lorenzo, Eric Machu, Lander Merma, Ivonne Montes, Naqvi Swa, Aurelien Paulmier, Michael Roman, Kenneth Rose, Raleigh Hood, Nancy N. Rabalais, Anne Gro V. Salvanes, Renato Salvatteci, Sonia Sánchez, Abdelfettah Sifeddine Sep 2021

System Controls Of Coastal And Open Ocean Oxygen Depletion, Grant C. Pitcher, Arturo Aguirre-Velarde, Denise Breitburg, Jorge Cardich, Jacob Carstensen, Daniel J. Conley, Boris Dewitte, Anja Engel, Dante Espinoza-Morriberón, Georgina Flores, Véronique Garçon, Michelle Graco, Marilaure Grégoire, Dimitri Gutiérrez, José Martin Hernandez-Ayon, Huai Hsuan May Huang, Kirsten Isensee, María Elena Jacinto, Lisa Levin, Alberto Lorenzo, Eric Machu, Lander Merma, Ivonne Montes, Naqvi Swa, Aurelien Paulmier, Michael Roman, Kenneth Rose, Raleigh Hood, Nancy N. Rabalais, Anne Gro V. Salvanes, Renato Salvatteci, Sonia Sánchez, Abdelfettah Sifeddine

Faculty Publications

The epoch of the Anthropocene, a period during which human activity has been the dominant influence on climate and the environment, has witnessed a decline in oxygen concentrations and an expansion of oxygen-depleted environments in both coastal and open ocean systems since the middle of the 20th century. This paper provides a review of system-specific drivers of low oxygen in a range of case studies representing marine systems in the open ocean, on continental shelves, in enclosed seas and in the coastal environment. Identification of similar and contrasting responses within and across system types and corresponding oxygen regimes is shown …

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Benthic Nutrient Fluxes Across Subtidal And Intertidal Habitats In Breton Sound In Response To River-Pulses Of A Diversion In Mississippi River Delta, Robert R. Twilley, Silke Rick, Daniel C. Bond, Justin Baker Sep 2021

Benthic Nutrient Fluxes Across Subtidal And Intertidal Habitats In Breton Sound In Response To River-Pulses Of A Diversion In Mississippi River Delta, Robert R. Twilley, Silke Rick, Daniel C. Bond, Justin Baker

Faculty Publications

We measured benthic fluxes of dissolved nutrients in subtidal sediments and intertidal soils associated with river-pulse events from Mississippi River via the operation of a river diversion struc-ture at Caernarvon, LA. Experiments measuring benthic fluxes in subtidal habitats were conducted during the early spring flood pulse (February and March) each year from 2002 to 2004, compared to benthic fluxes of intertidal habitats measured in February and March 2004. Nitrate (NO3−) uptake rates for subtidal sediments and intertidal soils depended on overlying water NO3− concentrations at near-, mid-, and far-field locations during river-pulse experiments when water temperatures were …

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Eating For Hunger Or Pleasure: A Serotonin Model, Zili Yan, Yanlin He, Xing Cai, Gang Shu, Yong Xu Sep 2021

Eating For Hunger Or Pleasure: A Serotonin Model, Zili Yan, Yanlin He, Xing Cai, Gang Shu, Yong Xu

Division of Basic Science Faculty Publications

No abstract provided.

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Multifunctional Corrosion Control System As A Sustainable Approach For Reinforced Concrete Elements, Homero Castaneda, Miladin Radovic, Brendy Rincon, Oladis Troconis, Arturo Montoya, Changkyu Kim, Loreto Dacio Sep 2021

Multifunctional Corrosion Control System As A Sustainable Approach For Reinforced Concrete Elements, Homero Castaneda, Miladin Radovic, Brendy Rincon, Oladis Troconis, Arturo Montoya, Changkyu Kim, Loreto Dacio

Publications

Corrosion inhibitors can be utilized to decrease the corrosion kinetics and therefore increase the durability of reinforced concrete structures. Recently, a green synthesized organic compound, 1-benzyl-4-phenyl-1H-1,2,3-triazole (BPT), was shown to be a successful green organic corrosion inhibitor for mild steel. Studies suggested that the BPT adsorbs chemically onto the steel and acts as a mixed inhibitor, suppressing both the anodic and cathodic corrosion kinetics of steel. In addition, microcapsules have shown to be an efficient way for a controlled inhibitor release in reinforced concrete structures. On the other hand, geopolymers (GPs) comprised of a long range of covalently bonded alumino-silicates, …

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Multiple Species And Deep Genomic Divergences Despite Little Phenotypic Differentiation In An Ancient Neotropical Songbird, Tunchiornis Ochraceiceps (Sclater, 1860) (Aves: Vireonidae), N Buainain, M F. Maximiano, M Ferreira, A Aleixo, N Buainain, R T. Brumfield, J Cracraft, C C. Ribas Sep 2021

Multiple Species And Deep Genomic Divergences Despite Little Phenotypic Differentiation In An Ancient Neotropical Songbird, Tunchiornis Ochraceiceps (Sclater, 1860) (Aves: Vireonidae), N Buainain, M F. Maximiano, M Ferreira, A Aleixo, N Buainain, R T. Brumfield, J Cracraft, C C. Ribas

Faculty Publications

Several bird taxa have been recently described or elevated to full species and almost twice as many bird species than are currently recognized may exist. Defining species is one of the most basic and important issues in biological science because unknown or poorly defined species hamper subsequent studies. Here, we evaluate the species limits and evolutionary history of Tunchiornis ochraceiceps-a widespread forest songbird that occurs in the lowlands of Central America, Choco and Amazonia-using an integrative approach that includes plumage coloration, morphometrics, vocalization and genomic data. The species has a relatively old crown age (similar to 9 Ma) and comprises …

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Genome-Wide Association And Selective Sweep Studies Reveal The Complex Genetic Architecture Of Dmi Fungicide Resistance In Cercospora Beticola, Rebecca Spanner, Demetris Taliadoros, Jonathan Richards, Viviana Rivera-Varas, Jonathan Neubauer, Mari Natwick, Olivia Hamilton, Niloofar Vaghefi, Sarah Pethybridge, Gary A. Secor, Timothy L. Friesen, Eva H. Stukenbrock, Melvin D. Bolton Sep 2021

Genome-Wide Association And Selective Sweep Studies Reveal The Complex Genetic Architecture Of Dmi Fungicide Resistance In Cercospora Beticola, Rebecca Spanner, Demetris Taliadoros, Jonathan Richards, Viviana Rivera-Varas, Jonathan Neubauer, Mari Natwick, Olivia Hamilton, Niloofar Vaghefi, Sarah Pethybridge, Gary A. Secor, Timothy L. Friesen, Eva H. Stukenbrock, Melvin D. Bolton

Faculty Publications

The rapid and widespread evolution of fungicide resistance remains a challenge for crop disease management. The demethylation inhibitor (DMI) class of fungicides is a widely used chemistry for managing disease, but there has been a gradual decline in efficacy in many crop pathosystems. Reliance on DMI fungicides has increased resistance in populations of the plant pathogenic fungus Cercospora beticola worldwide. To better understand the genetic and evolutionary basis for DMI resistance in C. beticola, a genome-wide association study (GWAS) and selective sweep analysis were conducted for the first time in this species. We performed whole-genome resequencing of 190 C. beticola …

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Trapping Soybean Looper (Lepidoptera: Noctuidae) In The Southeastern Usa And Implications For Pheromone-Based Research And Management, Daniel E. Fleming, Jeffrey A. Davis, Fred R. Musser, Silvana V. Paula-Moraes, Ronald C. Stephenson, Christopher A. Wheeler, Earl Eugene Ringpis, Tyler S. Crum, J. Khai Tran Sep 2021

Trapping Soybean Looper (Lepidoptera: Noctuidae) In The Southeastern Usa And Implications For Pheromone-Based Research And Management, Daniel E. Fleming, Jeffrey A. Davis, Fred R. Musser, Silvana V. Paula-Moraes, Ronald C. Stephenson, Christopher A. Wheeler, Earl Eugene Ringpis, Tyler S. Crum, J. Khai Tran

Faculty Publications

Novel strategies for the management of soybean looper, Chrysodeixis includens (Walker) (Lepidoptera: Noctuidae), are needed due to its increasing importance, costs, and challenges of management in soybeans (Glycine max [L.] Merr.; Fabaceae) in the Americas. Pheromone-mediated mating disruption may be 1 such novel strategy, but an effective tool for estimating mating disruption success must be found. The technique of trapping male moths using pheromone baited traps is a common method for assessing mating disruption technology. This paper reports on the testing of 2 trap types and 3 commercially available lures containing (Z)-7-dodecenyl acetate as the major active component. Trapping was …

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