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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, …

Trophic Interactions And Habitat Quality Of Invasive Lionfish In The Gulf Of Mexico, Hanna Bauer

LSU Master's Theses

Lionfish (Pterois volitans and Pterois miles) are one of the most successful marine invaders of all time and pose a threat to native species that inhabit coral reefs, as well as overall reef health. Current management efforts in the invaded Atlantic region revolve around spearfishing to remove lionfish, often limited to 30 m depth. There is evidence that lionfish may seek refuge from fishing pressure in deeper habitat and replenish shallow sites, undermining this management strategy. To investigate the ecological implications of deep lionfish, size, reproductive capability, and diet were examined across a depth gradient for lionfish in …

Identification And Quantification Of Microplastic Pollution In Water Samples And Four Species Of Fish From The Mississippi River, Kerrin E. Toner

LSU Master's Theses

Microplastics (£5 mm) have become a persistent anthropogenic pollutant and a growing environmental concern with evidence of them being found throughout several ecosystems. In recent years, there has been a growing recognition that rivers play a major role in transporting plastics from the land to the sea. The Mississippi River is the largest river in North America, draining land populated by over 100 million people. With high numbers of microplastics found in the waters of the northern of the Gulf of Mexico, it is likely that the Mississippi River is the primary source of these plastics. This study quantifies and …

Evaluating The ‘Small Changes, Healthy Habits’ Curriculum For Influencing Change In Eating And Physical Activity Behaviors, And Habit Formation In Adults, Praja Adhikari

LSU Master's Theses

This study evaluated the initial influence of the Small Changes, Healthy Habits (SCHH) pilot program on food/eating, and physical activity behaviors and habits among participants. A convenience sample of 56 adults (≥18 years old) with representation from communities in all five LSU AgCenter regions, was recruited for the program. Complete datasets from 47 participants were collected and used for the evaluation. The participant group was 83% female (n = 39), 89% 51 years or older, and living in rural areas; approximately 83% white (n=38), 13% African American (n=6), and 2% Asian (n=1). A 22-question participant survey was developed to quantify …

Southwest Pacific Tropical Cyclone Frequency And Intensity Related To Observed And Modeled Geophysical And Aerosol Variables, Rupsa Bhowmick

LSU Doctoral Dissertations

The dissertation focuses on western region of Southwest Pacific Ocean (SWPO)

basin (135E - 180, and 5S - 35S) tropical cyclone (TC) climatology using observed

and modeled data. The classification-based machine learning approach

identifies the synoptic geophysical and aerosol environment favorable or unfavorable

for TC intensification and intensity change prior to landfall incorporating

observational and satellite data. A multiple poisson regression model with varying

temporal monthly lags was used to build a relationship between the number of

monthly TC days with basin wide average dust aerosol optical depth (AOD), sea

surface temperature (SST), and upper ocean temperature (UOT). This idea …

Quantum Criticality In Strongly Correlated Electron Systems, Samuel Obadiah Kellar

LSU Doctoral Dissertations

The study of the Hubbard model in three dimensions contains a variety of phases dependent upon the chosen parameters. This thesis shows that there is the indication of a zero temperature phase transition at a finite doping. The Hubbard model has been used to identify a similar quantum critical point in two dimensions. The presented results continue these investigations. The system demonstrates a strange metal phase at finite temperature which cannot be described in term of the conventional Fermi liquid. While there have been extensive studies over the past three decades for such materials in two dimensions, there are few …

Eye-Hand Coordination Varies According To Changes In Cognitive-Motor Load And Eye Movements Used, Matthew Alan Yeomans

LSU Doctoral Dissertations

In this dissertation three studies were used to help improve the understanding of eye- hand coordination control of visuomotor reaching tasks with varying cognitive loads. Specifically, we considered potential performance differences based on eye-movements, postural influences, as well as fitness level of the young adult participants. A brief introduction in chapter 1 is followed by a detailed literature review in chapter 2. Results from the three studies presented in chapter’s 3-5 further advance our knowledge of the integrated control used for goal-directed visually-guided reaches. In the first study (chapter 3), the additional cost associated with the use of smooth pursuit …

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 …

Quantum Correlations Between Light And The Kilogram-Mass Mirrors Of Ligo, Haocun Yu, L. Mcculler, M. Tse, N. Kijbunchoo, L. Barsotti, N. Mavalvala, J. Betzwieser, C. D. Blair, S. E. Dwyer, A. Effler, M. Evans, A. Fernandez-Galiana, P. Fritschel, V. V. Frolov, F. Matichard, D. E. Mcclelland, T. Mcrae, A. Mullavey, D. Sigg, B. J.J. Slagmolen, C. Whittle, A. Buikema, Y. Chen, T. R. Corbitt, R. Schnabel, R. Abbott, C. Adams, R. X. Adhikari, A. Ananyeva, S. Appert, K. Arai, J. S. Areeda, Y. Asali

Faculty Publications

The measurement of minuscule forces and displacements with ever greater precision is inhibited by the Heisenberg uncertainty principle, which imposes a limit to the precision with which the position of an object can be measured continuously, known as the standard quantum limit1–4. When light is used as the probe, the standard quantum limit arises from the balance between the uncertainties of the photon radiation pressure applied to the object and of the photon number in the photoelectric detection. The only way to surpass the standard quantum limit is by introducing correlations between the position/momentum uncertainty of the object and the …

Identifying Structure Transitions Using Machine Learning Methods, Nicholas Walker

LSU Doctoral Dissertations

Methodologies from data science and machine learning, both new and old, provide an exciting opportunity to investigate physical systems using extremely expressive statistical modeling techniques. Physical transitions are of particular interest, as they are accompanied by pattern changes in the configurations of the systems. Detecting and characterizing pattern changes in data happens to be a particular strength of statistical modeling in data science, especially with the highly expressive and flexible neural network models that have become increasingly computationally accessible in recent years through performance improvements in both hardware and algorithmic implementations. Conceptually, the machine learning approach can be regarded as …

Wave Attenuation Toolbox (Watte), Madeline Foster-Martinez, Scott C. Hagen

Civil Engineering Datasets

WATTE is an ArcGIS toolbox. Its function is to estimate and map wave attenuation along coastlines. Wave attenuation is an important ecosystem service of natural coastal ecosystems. The current form of WATTE models wave attenuation as an exponential decay, which is common for marsh coastlines. WATTE calculates wave height change along 1-D transects and interpolates between the transects to produce estimates of wave attenuation and map areas of wave exposure. Users can customize the attributes of the transects and the exponential decay constants used for the calculation. WATTE can be applied to any raster with land type classification, allowing for …

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 …

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, …

Northwest- Summer 2020, Lsu Agcenter

Horticulture Hints

No abstract provided.

Northeast- Summer 2020, Lsu Agcenter

Horticulture Hints

No abstract provided.

Central- Summer 2020, Lsu Agcenter

Horticulture Hints

No abstract provided.

Southwest- Summer 2020, Lsu Agcenter

Horticulture Hints

No abstract provided.

Southeast- Summer 2020, Lsu Agcenter

Horticulture Hints

No abstract provided.

Multidimensional Molecular High-Harmonic Spectroscopy: A Road Map For Charge Migration Studies, Daniel R. Tuthill, François Mauger, Timothy D. Scarborough, Robert R. Jones, Mette B. Gaarde, Kenneth Lopata, Kenneth J. Schafer, Louis F. Dimauro

Faculty Publications

This review discusses recent experimental and theoretical analyses of high-harmonic spectroscopy in small molecules, with the aim of characterizing charge migration. We discuss the formulation of molecular high-harmonic spectra followed by methods to extract molecular-target-specific information, both in experiments and ab initio simulations. We present measured and simulated high-harmonic spectra from carbon dioxide and carbonyl sulfide to illustrate the necessity for multidimensional analyses for high-harmonic spectroscopies that include both the spectral amplitude and phase. Leveraging these results, we examine how such multidimensional analyses pave the way for the study of charge migration with high-harmonic spectroscopy and illustrate the beneficial role …

First Measurement Of The Charged Current Ν ¯ Μ Double Differential Cross Section On A Water Target Without Pions In The Final State First Measurement Of The Charged Current ... Abe K. Et Al., K. Abe, R. Akutsu, A. Ali, C. Alt, C. Andreopoulos, L. Anthony, M. Antonova, S. Aoki, A. Ariga, Y. Ashida, E. T. Atkin, Y. Awataguchi, S. Ban, M. Barbi, G. J. Barker, G. Barr, C. Barry, M. Batkiewicz-Kwasniak, A. Beloshapkin, F. Bench, V. Berardi, S. Berkman, L. Berns, S. Bhadra, S. Bienstock, A. Blondel, S. Bolognesi, B. Bourguille

Faculty Publications

This paper reports the first differential measurement of the charged-current ν¯μ interaction cross section on water with no pions in the final state. The unfolded flux-averaged measurement using the T2K off-axis near detector is given in double-differential bins of μ+ momentum and angle. The integrated cross section in a restricted phase space is σ=(1.11±0.18)×10-38 cm2 per water molecule. Comparisons with several nuclear models are also presented.

Multidimensional Molecular High-Harmonic Spectroscopy: A Road Map For Charge Migration Studies, Daniel R. Tuthill, François Mauger, Timothy D. Scarborough, Robert R. Jones, Mette B. Gaarde, Kenneth Lopata, Kenneth J. Schafer, Louis F. Dimauro

Faculty Publications

© 2020 Elsevier Inc. This review discusses recent experimental and theoretical analyses of high-harmonic spectroscopy in small molecules, with the aim of characterizing charge migration. We discuss the formulation of molecular high-harmonic spectra followed by methods to extract molecular-target-specific information, both in experiments and ab initio simulations. We present measured and simulated high-harmonic spectra from carbon dioxide and carbonyl sulfide to illustrate the necessity for multidimensional analyses for high-harmonic spectroscopies that include both the spectral amplitude and phase. Leveraging these results, we examine how such multidimensional analyses pave the way for the study of charge migration with high-harmonic spectroscopy and …

Sixty-First Supplement To The American Ornithological Society's Check-List Of North American Birds, R. Terry Chesser, Shawn M. Billerman, Kevin J. Burns, Carla Cicero, Jon L. Dunn, Andrew W. Kratter, Irby J. Lovette, Nicholas A. Mason, Pamela C. Rasmussen, J. V. Remsen, Douglas F. Stotz, Kevin Winker

Faculty Publications

No abstract provided.

Erratum: Small-Molecule Inhibitors Of Inward Rectifier Potassium (Kir) Channels Reduce Bloodmeal Feeding And Have Insecticidal Activity Against The Horn Fly (Diptera: Muscidae) (Journal Of Medical Entomology (2020) Doi: 10.1093/Jme/Tjaa015), Z. Li, F. Guerrero, A. A. Pérez De León, L. D. Foil, D. R. Swale

Faculty Publications

Correction of "Li Z., F. Guerrero, A. A. Pérez de León, L. D. Foil, and D. R. Swale. 2020. Small-Molecule Inhibitors of Inward Rectifier Potassium (Kir) Channels Reduce Bloodmeal Feeding and Have Insecticidal Activity Against the Horn Fly (Diptera: Muscidae). J. Med. Entomol."DOI: 10.1093/jme/tjaa015. In the original version of this article, the chemical structure of ML297 in Figure 1 was incorrect. The figure has been updated to contain the correct structure. The authors regret the error. (Figure Presented).

Multigrid Methods For Saddle Point Problems: Optimality Systems, Susanne C. Brenner, Sijing Liu, Li Yeng Sung

Faculty Publications

We develop multigrid methods for an elliptic distributed optimal control problem on convex domains that are robust with respect to a regularization parameter. We prove the uniform convergence of the W-cycle algorithm and demonstrate the performance of V-cycle and W-cycle algorithms through numerical experiments.

Breastfeeding And Childhood Obesity: A 12-Country Study, Jian Ma, Yijuan Qiao, Pei Zhao, Wei Li, Peter T. Katzmarzyk, Jean Philippe Chaput, Mikael Fogelholm, Rebecca Kuriyan, Estelle V. Lambert, Carol Maher, Jose Maia, Victor Matsudo, Timothy Olds, Vincent Onywera, Olga L. Sarmiento, Martyn Standage, Mark S. Tremblay, Catrine Tudor-Locke, Gang Hu

Population and Public Health Science Faculty Publications

This study aimed to examine the association between breastfeeding and childhood obesity. A multinational cross-sectional study of 4,740 children aged 9–11 years was conducted from 12 countries. Infant breastfeeding was recalled by parents or legal guardians. Height, weight, waist circumference, and body fat were obtained using standardized methods. The overall prevalence of obesity, central obesity, and high body fat were 12.3%, 9.9%, and 8.1%, respectively. After adjustment for maternal age at delivery, body mass index (BMI), highest maternal education, history of gestational diabetes, gestational age, and child's age, sex, birth weight, unhealthy diet pattern scores, moderate-to-vigorous physical activity, sleeping, and …

Genetic Susceptibility, Lifestyle Intervention And Glycemic Changes Among Women With Prior Gestational Diabetes, Zhaoxia Liang, Leishen Wang, Huikun Liu, Yuhang Chen, Tao Zhou, Yoriko Heianza, Junhong Leng, Weiqin Li, Xilin Yang, Yun Shen, Ru Gao, Gang Hu, Lu Qi

Population and Public Health Science Faculty Publications

Aims: Women with prior gestational diabetes mellitus (GDM) or high genetic susceptibility are prone to development of type 2 diabetes. We examined whether a lifestyle intervention modified the genetic effect on changes in glycemic markers among women with prior GDM. Research design and methods: This study included 560 women with prior GDM from a randomized controlled trial, the Tianjin Gestational Diabetes Mellitus Prevention Program, who were assigned into an intervention arm (improved physical activity and healthy dietary intakes) or a control arm. We assessed associations of GDM related genetic variants in/near the CDKAL1 (rs7754840) and MTNR1B (rs10830962) genes with changes …

Exercise Training Rapidly Increases Hepatic Insulin Extraction In Nafld, Adithya Hari, Ciaràn E. Fealy, Christopher L. Axelrod, Jacob M. Haus, Chris A. Flask, Arthur J. Mccullough, John P. Kirwan

Division of Basic Science Faculty Publications

Purpose We aimed to determine the immediacy of exercise intervention on liver-specific metabolic processes in nonalcoholic fatty liver disease. Methods We undertook a short-term (7-d) exercise training study (60 min·d-1 treadmill walking at 80%-85% of maximal heart rate) in obese adults (N = 13, 58 ± 3 yr, 34.3 ± 1.1 kg·m-2, >5% hepatic lipid by 1H-magnetic resonance spectroscopy). Insulin sensitivity index was estimated by oral glucose tolerance test using the Soonthorpun model. Hepatic insulin extraction (HIE) was calculated as the molar difference in area under the curve (AUC) for insulin and C-peptide (HIE = 1-(AUCInsulin/AUCC-Pep)). Results The increases in …

A Late Eocene-Oligocene Through-Flowing River Between The Upper Yangtze And South China Sea, Peter D. Clift, Andrew Carter, Anna Wysocka, Long Van Hoang, Hongbo Zheng, Nikki Neubeck

Faculty Publications

©2020. American Geophysical Union. All Rights Reserved. We test the hypothesis of a major Paleogene river draining the SE Tibetan Plateau and the central modern Yangtze Basin that then flowed south to the South China Sea. We test this model using U-Pb dated detrital zircon grains preserved in Paleogene sedimentary rocks in northern Vietnam and SW China. We applied a series of statistical tests to compare the U-Pb age spectra of the rocks in order to highlight differences and similarities between them and with potential source bedrocks. Monte Carlo mixing models imply that erosion was dominantly derived from the Indochina …

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 …

Assessing Breastfeeding Knowledge, Attitudes And Intention Among Adult Female Undergraduate And Graduate Students, Kritee Niroula

LSU Master's Theses

This study measured the breastfeeding knowledge, attitude and intention of adult female students of Louisiana State University. Participants (n=1039; mean age 20.12 ± 3.122 years) were recruited to complete the questionnaire. Racial/ethnic representation was White (76.1%), African American (14.3%), Asian (5.5%), American Indian/ Alaska Native or Native Hawaiian/ Pacific Islander (0.8%) and Multi-racial (3.3%). The questionnaire was used to deliver a set of knowledge, attitude and intention items. Participants were evaluated based on their scores in each section. The questionnaire was pilot tested among five students for comprehensibility and understandability and necessary changes were made according to their suggestions. The …