Digital Commons Network^™

The Function Of Transport Protein Mfl1 In Arabidopsis Thaliana, Joseph Qian

LSU Master's Theses

Photosynthesis serves as the primary process for plants to synthesize ATP and sugar molecules, however, this reaction requires many cofactors such as heme, plastoquinone, and iron-sulfur clusters to assist in energy gathering and electron transfer steps. Many of these require trace metals, such as iron, to cross across the chloroplast membranes and be incorporated into proteins and other organic molecules to form useable cofactors. The light-independent reactions of photosynthesis are also inefficient, with up to 25% of the photosynthetic energy wasted to metabolize the toxic waste product glycolate. The cellular logistics of both photorespiration and iron transport have been studied, …

Diminishing Benefits Of Urban Living For Children And Adolescents’ Growth And Development, Anu Mishra, Bin Zhou, Andrea Rodriguez-Martinez, Honor Bixby, Rosie K. Singleton, Rodrigo M. Carrillo-Larco, Kate E. Sheffer, Christopher J. Paciorek, James E. Bennett, Victor Lhoste, Maria L.C. Iurilli, Mariachiara Di Cesare, James Bentham, Nowell H. Phelps, Marisa K. Sophiea, Gretchen A. Stevens, Goodarz Danaei, Melanie J. Cowan, Stefan Savin, Leanne M. Riley, Edward W. Gregg, Wichai Aekplakorn, Noor Ani Ahmad, Jennifer L. Baker, Adela Chirita-Emandi, Farshad Farzadfar, Günther Fink, Mirjam Heinen, Nayu Ikeda, Andre P. Kengne, Young Ho Khang, Tiina Laatikainen, Avula Laxmaiah, Jun Ma

Population and Public Health Science Faculty Publications

Optimal growth and development in childhood and adolescence is crucial for lifelong health and well-being^1–6. Here we used data from 2,325 population-based studies, with measurements of height and weight from 71 million participants, to report the height and body-mass index (BMI) of children and adolescents aged 5–19 years on the basis of rural and urban place of residence in 200 countries and territories from 1990 to 2020. In 1990, children and adolescents residing in cities were taller than their rural counterparts in all but a few high-income countries. By 2020, the urban height advantage became smaller in most …

Framing Addiction: How Variations Of News Stories Affect Attitudes Toward Addicts, James A. Smith

LSU Master's Theses

Stigma toward drug addicts and alcoholics can act as a barrier to treatment and, ultimately, result in more lives lost. Over previous decades, journalists have largely framed addicts as problematic to society which contributes to public stigma. Prior research in social medicine has found that non-news portrayals of treated addicts can improve public attitudes. Similarly, studies in mass communication have found that different ways of framing news stories can elicit different attitudes from news consumers. The purpose of this study is to test the effects of thematic framing, episodic framing, problem framing, and solution framing on readers’ attitudes when journalists …

The Perceptions, Experiences, And Stories Of Tied-Migrant Music Educators: How The Personal And Professional Blend, Rachel K. Broyles

LSU Master's Theses

Centering around the purpose of examining the lived experiences and perspectives of self-identified tied-migrant music educators and how the transitory aspects of their personal lives impact their professional careers, this phenomenological case study discusses the findings of both a review of literature and completed original research utilizing two participants who are tied-migrant spouses in the music education field and examine their stories. For this study, tied- migrant spouses are defined as persons who are married to individuals who frequently relocate due to their professional occupation (Mincer, 1978). Participants include tied-migrant military spouses and tied-migrant civilian spouses.

Specific research questions include: …

Control And Optimization Of Multi-Agent Systems With Applications In Connected And Autonomous Electric Vehicles, Shaopan Guo

LSU Doctoral Dissertations

A multi-agent system (MAS) is a system in which multiple autonomous agents interact with each other to achieve a common goal. Nevertheless, current designs of MAS controllers typically rely on particular requirements, such as time-triggered communication, linear dynamics, and access to global information. These limitations restrict the applicability of MASs. This thesis aims to eliminate these constraints and optimize the energy consumption of a specific MAS, namely connected autonomous electric vehicles (CAEVs).

This thesis first addresses the consensus problem of linear MASs with intermittent communication. An adaptive distributed control algorithm that integrates edge-based event-triggered (ET) communication mechanisms is presented in …

Consumer Shift: Examining Female Generation Y Consumers’ Activewear Consumption, Lauren Laporte

LSU Master's Theses

The onset of the Covid-19 pandemic resulted in a change to standard consumption patterns as consumers began prioritizing health and wellness, working remotely, and made a switch from material-based consumption practices to an experiential-value-based consumption mindset. Additionally, Covid-19 brought economic downturns, loss of jobs, and supply chain issues. Consequently, the activewear market demonstrated unclear results making it necessary to understand trends within the activewear market while also understanding consumer motivations to wear or not to wear activewear during these societal shifts. This research paper aims it’s focus on female members of Generation Y, a popular and growing market for activewear. …

Extending Token Economy Systems For Children With Learning Disabilities And Developmental Disabilities Using Operant Behavioral Economics, Parker Levins

LSU Master's Theses

Token economy systems have been used successfully in various general and special education classrooms. Although effective, educators seldom have a priori information on the performance of their reinforcers within the schedules of reinforcement that comprise the token economy. Most token economies are initially designed based on clinical judgment and respective schedules are typically selected on an arbitrary basis (e.g., token-production Fixed Ratio 1 [FR1], exchange-production FR5). This introduces uncertainty whereby the initial arrangement may be too lax (i.e., work expectations are low for the student) or too strict (i.e., work expectations are high for the student), which both have the …

Will Digital Fashion Be The New Normal In The Metaverse Era: Examining Consumers’ Perceptions Of Digital Fashion, Yanbo Zhang

LSU Master's Theses

Digital fashion might bring an innovative and revolutionary answer to address environmental and social issues in the textile and apparel industry because it could simultaneously deliver sustainability and fashionability. To stay in the lead in the fashion kingdom and maintain innovativeness, luxury fashion brands are embracing digital fashion. Instead of constantly balancing or trading off between exclusive values and accessibility, luxury brands could enhance both through digital fashion items. As such, investigating consumers’ perceptions and evaluations of digital fashion in general and luxury brands’ digital fashion in specific is critical to fueling digital fashion. Accordingly, the current research has twofold …

The Black Performer's Toolbox: A Critical Authoethnography, Laura D. Oliver

LSU Doctoral Dissertations

Blackness shines bright like the moon and beams outside of identity parameters that are limiting in Western society to determine its communicative function inside and outside systems of power. When Blackness intersects with performance, various ways to construct identity are highlighted to expand our understanding of theory and methods that emphasize difference and culture. This research project aims to reimagine Blackness as a performance methodology to explore the performer’s livelihood onstage and constructions of race that impact identity offstage. Additionally, this project is built from a specific method created from the continuous use of expressive work that reflects societal challenges …

The Influence Of Child Maltreatment In The Manifestation Of Anxiety And Depressive Symptoms At The Age 18, Maria J. Velasquez

LSU Master's Theses

Child maltreatment affects thousands of children and adolescents every year. This phenomenon is multidimensional, meaning there are different subtypes (i.e., physical abuse, sexual abuse, emotional abuse, and neglect) known to predict various mental health issues, including depression and anxiety. While previous research has investigated mental health outcomes in maltreated youth, results may vary based on the dimensions of abuse considered. This study aims to expand on previous literature to examine how a history of child maltreatment subtypes influences the manifestation of anxiety and depressive symptoms in youth at age 18. The current study uses secondary data analysis of the Longitudinal …

Motivators And Preferences Of Route Diversion During Roadway Incidents, Grace Cole

LSU Master's Theses

When confronted with congestion and delay, drivers often divert their route. Depending on factors like purpose, urgency, destination, route alternatives, type of disruption, and mode options, common diversionary options can range from changing departure time, route, and mode to canceling a trip altogether. One of the foundational building blocks of travel forecasting is traffic assignment, which is used to distribute trips over a network using complex algorithms to aggregately represent the desire of drivers to minimize travel time.

While these assignment models are backed by decades of research and observational experience, they are also limited by the fact that they …

Modelling Illiquid Stocks Using Quantum Stochastic Calculus, Will Hicks

Journal of Stochastic Analysis

No abstract provided.

Thresholds Of Quantitative Swallowing Measures Following Intensive Prophylactic Therapy In Head And Neck Cancer, Deirdre Larsen

LSU Doctoral Dissertations

This retrospective, case-controlled study sought to identify salient features of swallowing physiology in head and neck cancer (HNC) patients and the threshold for features associating with increased dysphagia severity or decreased functional status. Quantitative measures of videofluoroscopic swallow studies (VFSS) were taken during three graduating liquid boluses and a paste bolus. Fifteen HNC subjects that received high frequency swallowing exercises (2 - 5 weekly sessions) during (chemo)radiation were compared pre- and(n = 15) or normal (n = 15) swallowing. HNC subjects were also stratified to compare those attending only pre- and(n = 8) to those also returning with dysphagia complaints …

Symmetric Functions Algebras I: Introduction And Basic Features, Philip Feinsilver

Journal of Stochastic Analysis

No abstract provided.

Random Variables With Overlapping Number And Weyl Algebras I, Ruma Dutta, Gabriela Popa, Aurel Stan

Journal of Stochastic Analysis

No abstract provided.

Fighting The Illicit Antiquities "Artworld": A Critical Approach To The Heritage Laws Of Guatemala, Irene Marti Gil

LSU Doctoral Dissertations

This dissertation examines the suitability of the legal framework for the protection of cultural heritage in Guatemala, which is the country of origin for over thirty percent of the Maya objects traded in the antiquities market, and proposes strategies that improve the effectiveness of the law. To examine the heritage laws enforced by the Republic of Guatemala, I implement linguistic anthropological methods of qualitative research.

Discourse Analysis, Critical Discourse Analysis, and Conceptual Analysis on the national heritage policies of Guatemala reveal the existence of ontological problems regarding the conceptualization of heritage as a monolithic entity reflecting a State-led narrative with …

A Multiple Case Study Of Adolescent Piano Students: Examining Motivation Through The Lens Of Interest Development, Carla Lucia Salas Ruiz

LSU Doctoral Dissertations

One way of understanding motivation is through the factors that influence it. These factors analyzed as psychological constructs give rise to the notion of motivation variables such as interest. Interest is a powerful variable that affects student motivation to learn (Hidi & Renninger, 2006; Hulleman et al., 2017; O’Keefe et al. 2017; Renninger & Hidi, 2016; Tin, 2013). In 2006, Hidi and Renninger proposed the “Four-Phase Interest Development Model” for the characterization of interest in learning. According to this model, learners can move from a situational level of interest development to a well-developed individual interest, in a sequential manner. This …

Autonomous Single-Molecule Manipulation Based On Reinforcement Learning, Bernhard Ramsauer, Grant J. Simpson, Johannes J. Cartus, Andreas Jeindl, Victor García-López, James M. Tour, Leonhard Grill, Oliver T. Hofmann

Faculty Publications

Building nanostructures one-by-one requires precise control of single molecules over many manipulation steps. The ideal scenario for machine learning algorithms is complex, repetitive, and time-consuming. Here, we show a reinforcement learning algorithm that learns how to control a single dipolar molecule in the electric field of a scanning tunneling microscope. Using about 2250 iterations to train, the algorithm learned to manipulate the molecule toward specific positions on the surface. Simultaneously, it generates physical insights into the movement as well as orientation of the molecule, based on the position where the electric field is applied relative to the molecule. This reveals …

Attochemistry Regulation Of Charge Migration, Aderonke S. Folorunso, François Mauger, Kyle A. Hamer, Denawakage D. Jayasinghe, Imam S. Wahyutama, Justin R. Ragains, Robert R. Jones, Louis F. Dimauro, Mette B. Gaarde, Kenneth J. Schafer, Kenneth Lopata

Faculty Publications

Charge migration (CM) is a coherent attosecond process that involves the movement of localized holes across a molecule. To determine the relationship between a molecule's structure and the CM dynamics it exhibits, we perform systematic studies of para-functionalized bromobenzene molecules (X-C6H4-R) using real-time time-dependent density functional theory. We initiate valence-electron dynamics by emulating rapid strong-field ionization leading to a localized hole on the bromine atom. The resulting CM, which takes on the order of 1 fs, occurs via an X localized → C6H4delocalized → R localized mechanism. Interestingly, the hole contrast on the acceptor functional group increases with increasing electron-donating …

The Impact Of Case Management Intervention For Insured Asthma Patients In Louisiana, An Empirical Study, Mohamed Mohamed Ohaiba

LSU Doctoral Dissertations

Asthma is a chronic condition whose symptoms are managed/prevented using medication and interventions. The overarching objective of this study was to evaluate the impact of patients' demographics on case management enrollment and healthcare utilization, as well as to develop machine learning models to predict high-cost patients.

To accomplish these goals, the Man-Whiteness test, the chi-squares test, logistic regression and odds ratios, and machine learning models were implemented. The average cost of the non-enrolled CM group was significantly higher than the enrolled group (p-value .0001). In addition, the non-enrolled groups had considerably more visits to the emergency department than the other …

What Are The Most Effective Proxies In Identifying Storm-Surge Deposits In Paleotempestology? A Quantitative Evaluation From The Sand-Limited, Peat-Dominated Environment Of The Florida Coastal Everglades, Qiang Yao, Kam Biu Liu, Zhenqing Zhang, Erika Rodrigues, Marcelo Cohen, Kanchan Maiti, Yang Yang

Faculty Publications

Although many studies have attempted to reconstruct millennial-scale hurricane patterns using various proxy-based methods, it is still unclear what the most effective proxies are to identify storm surge deposits in different environmental settings. This study quantitatively compares the application of grain-size, loss-on-ignition, stable isotopes, X-ray fluorescence, and palynological proxies in paleotempestology from an organic-rich environment in the Florida Everglades. The nonparametric tests indicate that only 9 among the 27 parameters (mean diameter, %water, %organic, %carbonate, Ca, Sr, Ca/Ti, Cl/Br, and marine microfossils) exhibited significant differences between storm-surge and in situ deposits. The principal component analysis shows that five marine indicators …

The Effects Of Hurricane Harvey On Texas Coastal-Zone Chemistry, Piers Chapman, Steven F. Dimarco, Anthony H. Knap, Antonietta Quigg, Nan D. Walker

Faculty Publications

Hurricane Harvey deposited over 90×109gm3 of rainwater over central Texas, USA, during late August/early September 2017. During four cruises (June, August, September and November 2017) we observed changes in hydrography and nutrient and oxygen concentrations in Texas coastal waters. Despite intense terrestrial runoff, nutrient supply to the coastal ocean was transient, with little phytoplankton growth observed and no hypoxia. Observations suggest this was probably related to the retention of nutrients in the coastal bays and rapid uptake by phytoplankton of nutrients washed out of the bays, as well as dilution by the sheer volume of rainwater and the lack of …

Multi-Agent Optimal Control For Central Chiller Plants Using Reinforcement Learning And Game Theory, Shunian Qiu, Zhenhai Li, Zhihong Pang, Zhengwei Li, Yinying Tao

Faculty Publications

To conserve building energy, optimal operation of a building’s energy systems, especially heating, ventilation and air-conditioning (HVAC) systems, is important. This study focuses on the optimization of the central chiller plant, which accounts for a large portion of the HVAC system’s energy consumption. Classic optimal control methods for central chiller plants are mostly based on system performance models which takes much effort and cost to establish. In addition, inevitable model error could cause control risk to the applied system. To mitigate the model dependency of HVAC optimal control, reinforcement learning (RL) algorithms have been drawing attention in the HVAC control …

Recent Advances And Challenges In Implementing Ipm Programmes In The Entomological Context Of Indian Agriculture, Ruchika Geedi, Gadi V.P. Reddy

Faculty Publications

Integrated pest management (IPM) programmes are based on using multiple methods to maintain nuisance insects below tolerant levels in crop fields. Recent advances in IPM in developed countries have incorporated biological pesticides, microbial products, semiochemicals, and beneficial insects, but few of such programmes have been successfully implemented in developing countries, such as India. Semiochemicals play critical roles as signals in various interspecific and intraspecific interactions between insects and plants, and among interacting insects, plants, and microbes. In India IPM programmes have included mechanical, chemical, cultural, and biological management strategies. However, among these methods, biological management has its own limitations. Indian …

Physical Activity And Weight Loss In A Pragmatic Weight Loss Trial, Peter T. Katzmarzyk, Emily F. Mire, Corby K. Martin, Robert L. Newton, John W. Apolzan, Kara D. Denstel, William D. Johnson, Phillip Brantley, Ronald Horswell, Benjamin F. Springgate, Terry C. Davis, Connie L. Arnold, Eboni Price-Haywood, Carl J. Lavie, Vivian A. Fonseca, Tina K. Thethi, Jonathan Gugel, Kathleen B. Kennedy, Daniel F. Sarpong

Clinical Research Faculty Publications

The purpose of this study was to determine the association between changes in physical activity and changes in body weight in a cluster-randomized weight loss trial conducted in an underserved population in Louisiana. This study reports analyses conducted in the intervention group only, which was a 24-month multi-component weight loss program delivered by health coaches embedded in primary care clinics. Physical activity was assessed at baseline and at 6, 12, and 24 months of follow-up and changes in body weight were expressed as percent weight change from baseline. Among the sample of 402 patients, percent changes in body weight (mean …

Exercise Modifies Hypothalamic Connectivity And Brain Functional Networks In Women After Bariatric Surgery: A Randomized Clinical Trial, Carlos A.A. Merege-Filho, Saulo S. Gil, John P. Kirwan, Igor H. Murai, Wagner S. Dantas, Mariana P. Nucci, Bruno Pastorello, Alisson Padilha De Lima, Paulo R. Bazán, Rosa M.R. Pereira, Ana L. De Sá-Pinto, Fernanda R. Lima, Sonia M.D. Brucki, Roberto De Cleva, Marco A. Santo, Claudia Da Costa Leite, Maria Concepción García Otaduy, Hamilton Roschel, Bruno Gualano

Division of Basic Science Faculty Publications

Background: Obesity is a disease that may involve disrupted connectivity of brain networks. Bariatric surgery is an effective treatment for obesity, and the positive effects on obesity-related conditions may be enhanced by exercise. Herein, we aimed to investigate the possible synergistic effects of Roux-en-Y Gastric Bypass (RYGB) and exercise training on brain functional networks. Methods: Thirty women eligible for bariatric surgery were randomly assigned to a Roux-en-Y gastric bypass (RYGB: n = 15, age = 41.0 ± 7.3 years) or RYGB plus Exercise Training (RYGB + ET: n = 15, age = 41.9 ± 7.2 years). Clinical, laboratory, and brain …

Factors Influencing Consumers’ Willingness-To-Try Seafood Byproducts, Silvia Murillo, Ryan Ardoin, Witoon Prinyawiwatkul

Faculty Publications

With increasing global demand for seafood, seafood byproducts (SB) utilization can contribute to a more sustainable food supply chain through waste-to-value food product development. However, consumer perceptions of SB (e.g., fish skin and bones) are underexplored. Therefore, this study aims to evaluate some factors influencing consumers’ willingness-to-try seafood byproducts. An online survey was conducted in the USA regarding intervention of SB informational cues with N = 904 adult seafood consumers internationally. The proportion of consumers willing to try SB increased significantly (McNemar’s test, α = 0.05) from 47% to 68% after SB safety and health claims had been presented in …

Can Biodiversity Of Preexisting And Created Salt Marshes Match Across Scales? An Assessment From Microbes To Predators, Friedrich W. Keppeler, James R. Junker, Margaret J. Shaw, Scott B. Alford, Annette S. Engel, Linda M. Hooper-Bùi, Olaf P. Jensen, Katelyn Lamb, Paola C. López-Duarte, Charles W. Martin, Ashley M. Mcdonald, Jill A. Olin, Audrey T. Paterson, Michael J. Polito, Nancy N. Rabalais, Brian J. Roberts, Ryann E. Rossi, Erick M. Swenson

Faculty Publications

Coastal wetlands are rapidly disappearing worldwide due to a variety of processes, including climate change and flood control. The rate of loss in the Mississippi River Delta is among the highest in the world and billions of dollars have been allocated to build and restore coastal wetlands. A key question guiding assessment is whether created coastal salt marshes have similar biodiversity to preexisting, reference marshes. However, the numerous biodiversity metrics used to make these determinations are typically scale dependent and often conflicting. Here, we applied ecological theory to compare the diversity of different assemblages (surface and below-surface soil microbes, plants, …

Associations Between Moderate To Vigorous Physical Activity, Sedentary Behavior, And Depressive Symptomatology In Adolescents: A Prospective Observational Cohort Study, Chelsea L. Kracht, Sai S. Pochana, Amanda E. Staiano

Population and Public Health Science Faculty Publications

Background: More moderate to vigorous physical activity (MVPA) and less time in sedentary behavior (SB) may protect against poor mental health in adolescence. Depressive symptomatology may also influence adolescents’ own MVPA and SB. The aim of this study was to examine the bidirectional relationship between adolescent MVPA, SB, and depressive symptomatology using a longitudinal approach. Methods: Adolescents (10–16 y) were recruited for a prospective observational cohort. Depressive symptomatology was measured using the Short Mood and Feelings Questionnaire. Accelerometry was used to measure MVPA and SB. Adolescents were classified by meeting the MVPA guideline (≥60 min/d) and quartiles of SB time, …

A Reference Genome For Bluegill (Centrarchidae: Lepomis Macrochirus), William B. Ludt, Eamon C. Corbett, Jerry Kattawar, Prosanta Chakrabarty, Brant C. Faircloth

Faculty Publications

North American sunfishes (Family Centrarchidae) are among the most popular sportfish throughout the United States and Canada. Despite the popularity of sunfishes, their ecological importance, and their extensive stocking and aquacultural history, few molecular studies have examined the evolutionary relationships and species boundaries among members of this group, many of which are known to hybridize. Here, we describe a chromosome-scale genome assembly representing Bluegill (Lepomis macrochirus), one of the most widespread centrarchid species. By combining long-read, Oxford Nanopore sequencing data with short-insert, whole-genome and HiC sequence reads, we produced an assembly (Lm_LA_1.1) having a total length of 889 Mb including …