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Influence Of P Fertility On Sweetpotato Rooting During Containerized Transplant Production, Lee T. Rouse Jul 2019

Influence Of P Fertility On Sweetpotato Rooting During Containerized Transplant Production, Lee T. Rouse

LSU Master's Theses

A market for edible landscape transplants continues to increase for vegetable production in the home landscape. A method for extending the salability of sweetpotato transplants in retail outlets is needed because containerized transplants can develop spiraling roots and deformed storage roots. Implementing traditional techniques to ameliorate container-bound roots before planting in the landscape is not advisable. Altering P fertility is a non-chemical and non-mechanical method for slowing sweetpotato rooting. Therefore, sweetpotato cuttings were planted in 100% sand-filled containers and fertilized at 0, 5, 10, 15, 20, and 31 mg L-1 using a modified Hoagland solution over a 6-week period. …

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Development Of Biological Tools To Promote Rice Health And Growth, Ateet Maharjan Jul 2019

Development Of Biological Tools To Promote Rice Health And Growth, Ateet Maharjan

LSU Master's Theses

Sheath blight (ShB - caused by Rhizoctonia solani) and bacterial panicle blight (BPB - caused by Burkholderia glumae) are economically important rice diseases in Louisiana and other rice-growing regions. Fungicides and oxolinic acid are used to manage ShB and BPB, respectively, but these chemical methods are not sustainable economically and ecologically. Besides diseases, plant utilizable nitrogen (N) in the soil is inadequate for optimum crop yield, leading to the use of inorganic fertilizers and making agriculture less sustainable. To develop alternative biological control methods for protecting rice plants from diseases, rice-associated bacteria were screened based on their antagonistic …

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Effects Of Silicon And Beneficial Bacteria On Sheath Blight Of Rice And The Microbial Community Of Rice Rhizosphere, Jhonson Leonard Jul 2019

Effects Of Silicon And Beneficial Bacteria On Sheath Blight Of Rice And The Microbial Community Of Rice Rhizosphere, Jhonson Leonard

LSU Master's Theses

Sheath blight (ShB), caused by Rhizoctonia solani Kühn, is an economically important soil-borne disease of rice (Oryza sativa) that can cause up to 50 % yield losses. Application of fungicides is the most effective and commonly used method for managing sheath blight. However, the pathogen can develop new resistant strains upon continuous exposure to a fungicide. Moreover, the use of inorganic fungicides is not eco-friendly. The utilization biological control agents (BCAs) can be a more sustainable and safe means of managing ShB. To develop alternate strategies for ShB management, I am exploring the effect of the silicon (Si) …

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Assessment Of Excess Thyroid Cancer Risk Following A Hypothetical Radiological Incident In Louisiana And Best-Case Risk Reduction Achieved By Thyroid Blockade, Garrett A. Otis Jul 2019

Assessment Of Excess Thyroid Cancer Risk Following A Hypothetical Radiological Incident In Louisiana And Best-Case Risk Reduction Achieved By Thyroid Blockade, Garrett A. Otis

LSU Master's Theses

Radioactive isotopes of iodine are produced by nuclear power plants as a byproduct of nuclear fission reactions. If these isotopes are released into the environment, such as during a breach of containment, they constitute a health risk to exposed individuals. To mitigate the risk of thyroid cancer due to exposure to radioactive iodine, “iodide prophylaxis,” also known as “thyroid blockade,” can be used, usually by administration of potassium iodide (KI). In some areas of the world, KI has been provided to the general public by their governments as a precautionary measure against potential nuclear power plant incidents. However, in the …

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Agricultural Education Teachers' Perceptions And Use Of Environmental Education In Louisiana Schools, Olivia M. Soler Jul 2019

Agricultural Education Teachers' Perceptions And Use Of Environmental Education In Louisiana Schools, Olivia M. Soler

LSU Master's Theses

The purpose of this study was to describe the status of environmental education (EE) in Louisiana high school agriculture classrooms. A census of Louisiana Agriscience Teacher Association (LATA) members was conducted to understand their perceptions, attitudes, and barriers regarding EE implementation. Icek Ajzen’s Theory of Planned Behavior was utilized as the theoretical framework. Data were collected through an online survey research method and analyzed using descriptive statistics. Results suggest that most LATA members incorporate EE into their curriculum relatively sparingly, perceive EE to be beneficial for students, and are in need of funding to incorporate EE into their curriculum as …

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Competitive Reversal Between Plant Species Is Driven By Species‐Specific Tolerance To Flooding Stress And Nutrient Acquisition During Early Marsh Succession, Andrew Muench, Tracy Elsey‐Quirk, Zhongling Yang Jul 2019

Competitive Reversal Between Plant Species Is Driven By Species‐Specific Tolerance To Flooding Stress And Nutrient Acquisition During Early Marsh Succession, Andrew Muench, Tracy Elsey‐Quirk, Zhongling Yang

Faculty Publications

No abstract provided.

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Improving The Transferability Of Suspended Solid Estimation In Wetland And Deltaic Waters With An Empirical Hyperspectral Approach, Daniel Jensen, Marc Simard, Kyle Cavanaugh, Yongwei Sheng, Cédric G. Fichot, Tamlin Pavelsky, Robert Twilley Jul 2019

Improving The Transferability Of Suspended Solid Estimation In Wetland And Deltaic Waters With An Empirical Hyperspectral Approach, Daniel Jensen, Marc Simard, Kyle Cavanaugh, Yongwei Sheng, Cédric G. Fichot, Tamlin Pavelsky, Robert Twilley

Faculty Publications

The deposition of suspended sediment is an important process that helps wetlands accrete surface material and maintain elevation in the face of sea level rise. Optical remote sensing is often employed to map total suspended solids (TSS), though algorithms typically have limited transferability in space and time due to variability in water constituent compositions, mixtures, and inherent optical properties. This study used in situ spectral reflectances and their first derivatives to compare empirical algorithms for estimating TSS using hyperspectral and multispectral data. These algorithms were applied to imagery collected by NASA’s Airborne Visible/Infrared Imaging Spectrometer-Next Generation (AVIRIS-NG) over coastal Louisiana, …

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Synthesis And Characterization Of Polylactide-Pamam “Janus-Type” Linear-Dendritic Hybrids, Indika Chandrasiri, Daniel G. Abebe, Sudipta Gupta, Jon Steven Dal Williams, William D. Rieger, Briana L. Simms, Mahesh Loku Yaddehige, Ye Rim Noh, Molly E. Payne, Alexander W. Fortenberry, Adam E. Smith, Jan Ilavsky, Scott M. Grayson, Gerald J. Schneider, Davita L. Watkins Jul 2019

Synthesis And Characterization Of Polylactide-Pamam “Janus-Type” Linear-Dendritic Hybrids, Indika Chandrasiri, Daniel G. Abebe, Sudipta Gupta, Jon Steven Dal Williams, William D. Rieger, Briana L. Simms, Mahesh Loku Yaddehige, Ye Rim Noh, Molly E. Payne, Alexander W. Fortenberry, Adam E. Smith, Jan Ilavsky, Scott M. Grayson, Gerald J. Schneider, Davita L. Watkins

Faculty Publications

© 2019 Wiley Periodicals, Inc. Herein, we present a facile and comprehensive synthetic methodology for the preparation of polyester-polyamidoamine (PAMAM) (i.e., polyester: polylactide [PLA] (hydrophobic) and polyamidoamine, PAMAM [hydrophilic]) polymers. A library of PLA-PAMAM linear dendritic block copolymers (LDBCs) in which both l and d, l polylactide were employed in mass ratios of 30:70, 50:50, 70:30, and 90:10 (PLA:PAMAM) were synthesized and analyzed. When placed in aqueous media, the immiscibility of the hydrophilic and hydrophobic segments leads to nanophase-segregation exhibited as the formation of aggregates (e.g., vesicles, worms, and/or micelles). By employing both stereochemical configurations of PLA, the differentiation in …

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Temporal And Spatial Dynamics Of Competitive Parapatry In Chewing Lice, Mark S. Hafner Jul 2019

Temporal And Spatial Dynamics Of Competitive Parapatry In Chewing Lice, Mark S. Hafner

Faculty Publications

We synthesize observations from 1979 to 2016 of a contact zone involving two subspecies of pocket gophers (Thomomys bottae connectens and T. b. opulentus) and their respective chewing lice (Geomydoecus aurei and G. centralis) along the Rio Grande Valley in New Mexico, U.S.A., to test predictions about the dynamics of the zone. Historically, the natural flood cycle of the Rio Grande prevented contact between the two subspecies of pocket gophers. Flood control measures completed in the 1930s permitted contact, thus establishing the hybrid zone between the pocket gophers and the contact zone between their lice (without hybridization). Since that time, …

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Maternal Childhood And Lifetime Traumatic Life Events And Infant Bronchiolitis, Margaret A. Adgent, Omar Elsayed-Ali, Tebeb Gebretsadik, Frances A. Tylavsky, Mehmet Kocak, Stephania A. Cormier, Rosalind J. Wright, Kecia N. Carroll Jul 2019

Maternal Childhood And Lifetime Traumatic Life Events And Infant Bronchiolitis, Margaret A. Adgent, Omar Elsayed-Ali, Tebeb Gebretsadik, Frances A. Tylavsky, Mehmet Kocak, Stephania A. Cormier, Rosalind J. Wright, Kecia N. Carroll

Faculty Publications

© 2019 John Wiley & Sons Ltd Background: Viral bronchiolitis is a common respiratory infection that often affects term, otherwise healthy infants. A small literature suggests maternal stress during pregnancy is associated with bronchiolitis. However, the association between maternal exposure to lifetime traumatic stress, including traumatic events occurring in childhood or throughout the life course, and bronchiolitis has not been studied previously. Objectives: To investigate the association between maternal exposure to total lifetime and childhood traumatic stress events and infant bronchiolitis. Methods: We studied mother-infant dyads enrolled in a prospective prenatal cohort, recruited 2006-2011, and Tennessee Medicaid. During pregnancy, we …

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Louisiana Agriculture Summer, 2019, Lsu Agcenter Jul 2019

Louisiana Agriculture Summer, 2019, Lsu Agcenter

Louisiana Agriculture

No abstract provided.

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Northwest- Summer 2019, Lsu Agcenter Jul 2019

Northwest- Summer 2019, Lsu Agcenter

Horticulture Hints

No abstract provided.

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Northeast- Summer 2019, Lsu Agcenter Jul 2019

Northeast- Summer 2019, Lsu Agcenter

Horticulture Hints

No abstract provided.

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Central- Summer 2019, Lsu Agcenter Jul 2019

Central- Summer 2019, Lsu Agcenter

Horticulture Hints

No abstract provided.

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Southwest- Summer 2019, Lsu Agcenter Jul 2019

Southwest- Summer 2019, Lsu Agcenter

Horticulture Hints

No abstract provided.

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Southeast- Summer 2019, Lsu Agcenter Jul 2019

Southeast- Summer 2019, Lsu Agcenter

Horticulture Hints

No abstract provided.

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A Phylogenomic Supertree Of Birds, R T. Kimball, C H. Oliveros, N Wang, N D. White, R T. Kimball, D J. Field, D T. Ksepka, R T. Chesser, R G. Moyle, M J. Braun, R T. Brumfield, B C. Faircloth, B T. Smith, E L. Braun Jul 2019

A Phylogenomic Supertree Of Birds, R T. Kimball, C H. Oliveros, N Wang, N D. White, R T. Kimball, D J. Field, D T. Ksepka, R T. Chesser, R G. Moyle, M J. Braun, R T. Brumfield, B C. Faircloth, B T. Smith, E L. Braun

Faculty Publications

It has long been appreciated that analyses of genomic data (e.g., whole genome sequencing or sequence capture) have the potential to reveal the tree of life, but it remains challenging to move from sequence data to a clear understanding of evolutionary history, in part due to the computational challenges of phylogenetic estimation using genome-scale data. Supertree methods solve that challenge because they facilitate a divide-and-conquer approach for large-scale phylogeny inference by integrating smaller subtrees in a computationally efficient manner. Here, we combined information from sequence capture and whole-genome phylogenies using supertree methods. However, the available phylogenomic trees had limited overlap …

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Resetting The Table For People And Plants: Botanic Gardens And Research Organizations Collaborate To Address Food And Agricultural Plant Blindness, Sarada Krishnan, Tara Moreau, Jeff Kuehny, Ari Novy, Stephanie L. Greene, Colin K. Khoury Jul 2019

Resetting The Table For People And Plants: Botanic Gardens And Research Organizations Collaborate To Address Food And Agricultural Plant Blindness, Sarada Krishnan, Tara Moreau, Jeff Kuehny, Ari Novy, Stephanie L. Greene, Colin K. Khoury

Faculty Publications

Societal Impact Statement: Food and agricultural plants are integral to human well-being. Due to their universal importance, such plants would appear to represent an ideal entryway by which to address plant blindness. However, with limited opportunities for direct contact with agriculture, many people cannot appreciate the flora that feed us every day. We provide examples of informal education initiatives aimed at increasing public awareness and appreciation of food and agricultural plants, made possible through collaborations between botanic gardens, academic institutions, nonprofits, and agricultural research organizations. We hope these examples encourage and inspire organizations to further utilize food and agricultural plants …

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Elemental Composition, Phosphorous Uptake, And Characteristics Of Growth Of A Sar11 Strain In Batch And Continuous Culture, Scott R. Grant, Matthew J. Church, Sara Ferrón, Edward A. Laws, Michael S. Rappé Jul 2019

Elemental Composition, Phosphorous Uptake, And Characteristics Of Growth Of A Sar11 Strain In Batch And Continuous Culture, Scott R. Grant, Matthew J. Church, Sara Ferrón, Edward A. Laws, Michael S. Rappé

Faculty Publications

In this study, a strain of SAR11 subgroup IIIa (termed HIMB114) was grown in seawater-based batch and continuous culture in order to quantify cellular features and metabolism relevant to SAR11 ecology. We report some of the first direct measurements of cellular elemental quotas for nitrogen (N) and phosphorus (P) for SAR11, grown in batch culture: 1.4 0.9 fg N and 0.44 0.01 fg P, respectively, that were consistent with the small size of HIMB114 cells (average volume of 0.09 m3). However, the mean carbon (C) cellular quota of 50 47 fg C was anomalously high, but variable. The …

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Hole Filling In 3d Scans For Digital Anthropometric Applications, Sima Sobhiyeh, Marcelline Dechenaud, Alexander Dunkel, Margarite Laborde, Samantha Kennedy, John Shepherd, Steven Heymsfield, Peter Wolenski Jul 2019

Hole Filling In 3d Scans For Digital Anthropometric Applications, Sima Sobhiyeh, Marcelline Dechenaud, Alexander Dunkel, Margarite Laborde, Samantha Kennedy, John Shepherd, Steven Heymsfield, Peter Wolenski

Faculty Publications

Anthropometric measurements have been used to assess an individual's body composition, disease risk, and nutritional status. Three-dimensional (3D) optical devices can rapidly acquire body surface scans in the form of a triangular mesh which can then be used to obtain anthropometric measurements such as body volume, limb lengths, and circumferences; however, the meshes provided by some scanners may include missing data patches known as holes. These need to be repaired in order to obtain correct landmark detection and automatic calculation of anthropometric measurements -especially body volume. In this study, we present ScReAM (Scan Reconstruction for Anthropometric Measurements) which is a …

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In Vitro And In Vivo (Mouse Model) Investigation Of The Efficacy Of Probiotic Bacteria Lactobacillus Casei And Lactobacillus Rhamnosus Incorporated In Tomato Juice, Bennett Atta Dzandu Jul 2019

In Vitro And In Vivo (Mouse Model) Investigation Of The Efficacy Of Probiotic Bacteria Lactobacillus Casei And Lactobacillus Rhamnosus Incorporated In Tomato Juice, Bennett Atta Dzandu

LSU Doctoral Dissertations

Fruit and vegetable production in Ghana were estimated at 371,811 tons in 2017 with tomatoes ranked among the top four most cultivated vegetables. The majority of the production goes to waste due to spoilage and lack of processing. Probiotics have recently gained much attention owing to claims about their potential health benefits. However, the inability of certain probiotics to survive gastric conditions remain a potential setback. Tomatoes can be processed into value added products including those fortified with probiotics. Such value-added products can be used as protectant for the delivery of probiotics to improve gut health. The objective of this …

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Effects Of Virus Infection And Volatiles On Aphid Virus Vector Behavior On Sweetpotato, John Lawrence Dryburgh Jul 2019

Effects Of Virus Infection And Volatiles On Aphid Virus Vector Behavior On Sweetpotato, John Lawrence Dryburgh

LSU Doctoral Dissertations

Sweetpotato is affected by a wide variety of viruses worldwide, which can cause yield losses of up to 90%. Many of these viruses are transmitted by aphids in a non-persistent manner. Non-persistent viruses are acquired and transmitted within minutes, and thus conventional control, such as insecticides, are ineffective. Altering aphid movement and feeding behavior may affect the rate of virus transmission. One potential method to alter aphid behavior is volatile organic compounds (VOC), including volatiles emitted by virus infected plants, plant hormones, and commercial control agents. Aphid movement near sweetpotato fields was monitored to determine trends throughout the growing season. …

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Observations And Modeling Of A Hydrothermal Plume In Yellowstone Lake, Robert A. Sohn, Karen Luttrell, Emily Shroyer, Christian Stranne, Robert N. Harris, Julia E. Favorito Jun 2019

Observations And Modeling Of A Hydrothermal Plume In Yellowstone Lake, Robert A. Sohn, Karen Luttrell, Emily Shroyer, Christian Stranne, Robert N. Harris, Julia E. Favorito

Faculty Publications

©2019. American Geophysical Union. All Rights Reserved. Acoustic Doppler current profiler and conductivity-temperature-depth data acquired in Yellowstone Lake reveal the presence of a buoyant plume above the “Deep Hole” hydrothermal system, located southeast of Stevenson Island. Distributed venting in the ~200 × 200-m hydrothermal field creates a plume with vertical velocities of ~10 cm/s in the mid-water column. Salinity profiles indicate that during the period of strong summer stratification the plume rises to a neutral buoyancy horizon at ~45-m depth, corresponding to a ~70-m rise height, where it generates an anomaly of ~5% (−0.0014 psu) relative to background lake water. …

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Large-Scale Data Analysis And Deep Learning Using Distributed Cyberinfrastructures And High Performance Computing, Richard Dodge Platania Jun 2019

Large-Scale Data Analysis And Deep Learning Using Distributed Cyberinfrastructures And High Performance Computing, Richard Dodge Platania

LSU Doctoral Dissertations

Data in many research fields continues to grow in both size and complexity. For instance, recent technological advances have caused an increased throughput in data in various biological-related endeavors, such as DNA sequencing, molecular simulations, and medical imaging. In addition, the variance in the types of data (textual, signal, image, etc.) adds an additional complexity in analyzing the data. As such, there is a need for uniquely developed applications that cater towards the type of data. Several considerations must be made when attempting to create a tool for a particular dataset. First, we must consider the type of algorithm required …

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The Religion Of Policing: Race, Riots, And The Killing Of Alton Sterling, Landon Jay Douglas Jun 2019

The Religion Of Policing: Race, Riots, And The Killing Of Alton Sterling, Landon Jay Douglas

LSU Doctoral Dissertations

Deadly force encounters with black people and law enforcement officials are far too numerous and encounters that result in the death of civilians do not always result in disciplinary actions against officers, many of whom are white. The high-profile killings of black people in America require an in-depth analysis of race, policing, and the origins of tactics used by law enforcement against black people, which is not merely data-driven, but also theory driven. In trying to understand the disparate treatment experienced by black people at the hands of law enforcement officials, and the extent to which many Americans, mostly white …

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Developmental Regression In Children With Autism Spectrum Disorder: Associated Factors And Outcomes, Jasper Abarte Estabillo Jun 2019

Developmental Regression In Children With Autism Spectrum Disorder: Associated Factors And Outcomes, Jasper Abarte Estabillo

LSU Doctoral Dissertations

Autism spectrum disorder (ASD) is an increasingly common neurodevelopmental disorder characterized by deficits in socialization skills and the presence of restricted and repetitive behaviors. In addition to a number of medical and psychological comorbidities, ASD is associated with a complex phenomenon: developmental regression (i.e., loss of skills in developmental domains). Although present in other disorders (albeit rare), developmental regression is prevalent among individuals with ASD. Thus, interest in studying the phenomenon has grown. However, research on associated risk factors and outcomes is limited and findings have been inconsistent. The current study had two aims: (1) examine potential factors associated with …

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Iron-Sulfur Cluster Biosynthesis In Methanogens, Cuiping Zhao Jun 2019

Iron-Sulfur Cluster Biosynthesis In Methanogens, Cuiping Zhao

LSU Doctoral Dissertations

Methanogens live in a syntrophic consortium with bacteria, taking advantage of the metabolic abilities of their syntrophic partners to overcome energetic barriers and break down compounds that they cannot digest by themselves. Interspecies electron transfer, which is a major type of microbial communication in syntrophic processes, improves methanogenesis and anaerobic oxidization of methane (AOM) processes involved in syntrophic consortia. These processes have a significant impact on the global carbon cycle. Most of the essential enzymes involved in methanogenesis are iron-sulfur proteins. Iron-sulfur clusters are one of the oldest and most versatile cofactors present in all domains of life. To date, …

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Characterization Of The Integrated Signaling Network Of Burkholderia Glumae For The Regulation Of Virulence-Related Function In The Bacterial Pathogenesis Of Rice Plants, Tiago De Paula Lelis Jun 2019

Characterization Of The Integrated Signaling Network Of Burkholderia Glumae For The Regulation Of Virulence-Related Function In The Bacterial Pathogenesis Of Rice Plants, Tiago De Paula Lelis

LSU Doctoral Dissertations

Bacterial panicle blight of rice (BPB) caused by Burkholderia glumaeis a major bacterial disease of rice in many rice-producing areas worldwide. Managing the disease is still very difficult due to the lack of effective methods. B. glumaestrains show phenotypic and genomic variations; however, little variation was detected in the known virulence-related genes. In the present study, the complete genome of B. glumae257sh-1, a natural avirulent strain, was sequenced and analyzed. Several spontaneous mutations in the regulatory genes of these avirulent strains were identified. Presumably, the accumulation of these mutations can have a negative effect on the normal …

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"If They Don't Tell You, The Hair Will": Hair Narrative In Contemporary Women's Writing, Darina Pugacheva Jun 2019

"If They Don't Tell You, The Hair Will": Hair Narrative In Contemporary Women's Writing, Darina Pugacheva

LSU Doctoral Dissertations

The history of colonial and racial oppression made hair stories and testimonials fundamental to understanding hair as a unifying element particular for women of African descent in the post-slavery era. Seen as such, their hair narrations provide the first-person perspective of their life experiences while at the same time inviting a critical investigation of colonial and racial oppression. Contemporary women writers develop these types of narrations into a special language of hair that helps them tell a story that is not apparent or straightforward. This literary device that uses hair to uncover deeper social and political issues is bound up …

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Hourly Precipitation Climatology Of The Southeast United States, Vincent Brown Jun 2019

Hourly Precipitation Climatology Of The Southeast United States, Vincent Brown

LSU Doctoral Dissertations

Precipitation changes are one of the most important potential outcomes of a warming climate because of how essential it is to society and ecosystems. Sub-daily precipitation time series provide more information on precipitation characteristics, particularly frequency, intensity, and duration compared to daily data. In a series of four peer-reviewed manuscripts, this research investigates sub-daily precipitation characteristics from a climatological perspective. The first study introduces a climatology of hourly precipitation for four first-order weather stations across Louisiana, explores possible changes in the hourly precipitation distribution, and links winter Gulf of Mexico sea surface temperatures to the frequency of hours with precipitation. …

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