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Evaluating The Effects Of Vacuum Tumbling With Chitosan Nanoparticles And Water-Soluble Chitosan On The Shelf Life Of Cryogenically Frozen Shrimp, Alexander Chouljenko Jan 2015

Evaluating The Effects Of Vacuum Tumbling With Chitosan Nanoparticles And Water-Soluble Chitosan On The Shelf Life Of Cryogenically Frozen Shrimp, Alexander Chouljenko

LSU Master's Theses

Chitosan (CH) is a biopolymer obtained from the deacetylation of chitin, a polysaccharide present in the exoskeleton of crustaceans and cell walls of fungi. Application of CH may be limited by its water-insolubility. It can be dissolved in acids and forms relatively high viscosity solutions. CH solutions have antioxidant and antimicrobial properties. CH penetration into shrimp may be facilitated by vacuum tumbling with low viscosity chitosan-sodium tripolyphosphate (CH-TPP) nanoparticle or water-soluble chitosan (WSC) solutions. It is expected that this would reduce lipid oxidation and microbial loads. In this study, CH-TPP and WSC solutions were developed and applied to shrimp, and …

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Evaluation Of Whey-Protein-Isolate Edible Films Containing Oregano (Origanum Vulgare) Essential Oil To Improve Shelf Life Of Cheeses During Refrigerated Storage, Cristhiam Gurdian Jan 2015

Evaluation Of Whey-Protein-Isolate Edible Films Containing Oregano (Origanum Vulgare) Essential Oil To Improve Shelf Life Of Cheeses During Refrigerated Storage, Cristhiam Gurdian

LSU Master's Theses

Oregano essential oil (OEO) is recognized for antimicrobial and antioxidant properties. Incorporation of OEO into an edible film prepared with whey protein isolate (WPI) may improve the shelf-life of queso blanco (cheese). The overall goal of the proposed study was to develop and evaluate the effectiveness of antimicrobial and antioxidant WPI edible films (WPIFs) with OEO to improve the shelf life of queso blanco wrapped in the WPIFs during one month of refrigerated storage. Production of potential antimicrobial and antioxidant WPIFs with OEO (WPIOF) was possible. Flaxseed oil (FO) was incorporated into cheese by homogenization (HFQ), which caused significant susceptibility …

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Effectiveness Of An Artisanal Mcphail Trap For Mass Trapping Tephritid Fruit Flies In Haiti, Fractyl Mertilus Jan 2015

Effectiveness Of An Artisanal Mcphail Trap For Mass Trapping Tephritid Fruit Flies In Haiti, Fractyl Mertilus

LSU Master's Theses

Three field experiments were conducted in a mango orchard in Croix-des-bouquets (Haïti) to develop an effective artisanal McPhail trap, less expensive than the commercial traps, for mass trapping Anastrepha obliqua (Macquart) and Anastrepha suspensa (Loew). A field trial conducted to evaluate the effectiveness of two newly made artisanal trap models (AT1 and AT2) with the commercial McPhail trap (MP) demonstrated that the artisanal traps yielded similar results in the average number of fruit flies caught (8.9±2.6, 13±2.9, and 16±4.1 respectively). Moreover, the cost-efficacy ratio was a lot higher in the artisanal trap models (AT1: 0.42 $ per flies caught, AT2: …

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The Production Of Marketable Vegetable Transplants Using Sustainable Locally Sourced Soilless Media Amendments, Amber Dawn Parker Jan 2015

The Production Of Marketable Vegetable Transplants Using Sustainable Locally Sourced Soilless Media Amendments, Amber Dawn Parker

LSU Master's Theses

Public demand for sustainable local and organic food products has led these systems to become one of the fastest growing sectors in the agricultural food market. Consumers are willing to pay a premium for food produced using organic or sustainable practices. Local and small-scale farmers are striving to develop sustainable and in some cases USDA certified organic systems in production of vegetables and fruit. Warm season crops are commonly produced using transplants. Evaluation of nutrient availability is needed for the use of readily available local waste-streams byproducts, such as manures and composts, for amendments or fertilizers in order to manage …

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Magnetic Resonance Elastography Of The Brain Using An Ergonomic Driver: Assessment Of Scan-Rescan Reproducibility, Hatim Chafi Jan 2015

Magnetic Resonance Elastography Of The Brain Using An Ergonomic Driver: Assessment Of Scan-Rescan Reproducibility, Hatim Chafi

LSU Master's Theses

Magnetic resonance elastography (MRE) allows the visualization of displacement patterns from induced harmonic mechanical waves propagating in tissue. Strain and mechanical properties can be computed from these displacement patterns. Mechanical properties of tissue are affected by various disease processes. MRE has shown brain tumor to differ in stiffness in comparison to normal tissue. MRE is currently being offered as an upgrade on most conventional MRI scanners. However, the actuator supplied by vendors is a drum driver designed primarily for hepatic MRE scan. The goals of the project was to design and build an ergonomic flexible driver for use in MRE …

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Fish Biomass And Community Structure Around Standing And Toppled Oil And Gas Platforms In The Northern Gulf Of Mexico Using Hydroacoustic And Video Surveys, Emily Marissa Reynolds Jan 2015

Fish Biomass And Community Structure Around Standing And Toppled Oil And Gas Platforms In The Northern Gulf Of Mexico Using Hydroacoustic And Video Surveys, Emily Marissa Reynolds

LSU Master's Theses

There has been relatively little study of the efficacy of decommissioned oil and gas platforms as artificial reef habitats for fish assemblages in the northern Gulf of Mexico (GOM). A variety of fish species have been reported on these structures, but the species biomass distribution and community structure has not been studied thoroughly. Hydroacoustic and video surveys were conducted quarterly from June 2013 to June 2014 at three standing and two toppled oil and gas platforms located approximately 130 km off the coast of Louisiana at 90 m depth; to gain information about the spatial biomass distribution and community structure …

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Influence Of Atrazine Formulation And Irrigation Incorporation Of Off-Site Transport In A Centipedegrass Home Lawn, Kimberly Joy Pope Jan 2015

Influence Of Atrazine Formulation And Irrigation Incorporation Of Off-Site Transport In A Centipedegrass Home Lawn, Kimberly Joy Pope

LSU Master's Theses

Atrazine, one of the most widely used herbicides in the United States, is commonly applied to southern lawn grasses to reduce weed encroachment. According to the EPA, atrazine is also one of the most frequently identified herbicidal compounds in surface and ground waters. Given the increased management intensity of home lawns in Louisiana, coupled with urban sprawl and high rainfall has led to a higher potential for movement of atrazine into surface waters during runoff events. Experiments were conducted at the LSU AgCenter Burden Botanic Gardens on centipedegrass (Eremochloa ophiuroides) at a 5% slope to evaluate the effect of atrazine …

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Oil And Gas Platforms On Ship Shoal, Northern Gulf Of Mexico As Habitat For Reef-Associated Organisms, David Bradley Reeves Jan 2015

Oil And Gas Platforms On Ship Shoal, Northern Gulf Of Mexico As Habitat For Reef-Associated Organisms, David Bradley Reeves

LSU Master's Theses

Nearshore Louisiana has experienced substantial changes within the last half-century, including the annual formation of the world’s second largest hypoxic zone and the construction of thousands of oil and gas platforms (rigs). Ship Shoal and its rigs may provide important substrate in nearshore Louisiana because rigs act as de facto artificial reefs and the shoal’s bottom waters were well oxygenated on 43% of days when surrounding areas were hypoxic. From July to September of 2014, fish assemblages and hydrography were compared at shoal rigs, rigs inshore of the shoal, and rigs offshore of the shoal, and stone crab populations were …

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Effect Of Specific Feedback On Growth Mindset And Achievement, Erin Elizabeth Gauthreaux Jan 2015

Effect Of Specific Feedback On Growth Mindset And Achievement, Erin Elizabeth Gauthreaux

LSU Master's Theses

Every student has a different mindset, or their own way of viewing challenges and setbacks. The purpose of this study was to determine the effectiveness of a specific feedback intervention on student mindset and achievement in a middle school life science course. Several tests were used to compare the data at the beginning of the school year and at the end of the school year. These tests included mindset, competency in science, attitudes about learning science, and life science content knowledge. The control group was taught by the use of lecture, note-taking, and life science activities. The experimental group was …

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Anthropogenic Impacts On Soil Microbial Processes In Coastal Wetlands: Nutrient Loading And Rising Co2 Levels, Havalend Ellen Steinmuller Jan 2015

Anthropogenic Impacts On Soil Microbial Processes In Coastal Wetlands: Nutrient Loading And Rising Co2 Levels, Havalend Ellen Steinmuller

LSU Master's Theses

Atmospheric carbon dioxide (CO2) levels and global eutrophication are anthropogenic stressors impacting the environment of specific interest in wetland systems. Wetlands occupy a critical interface between terrestrial and aquatic environments. Fertilizer use for agriculture and treated wastewater disposal has increased nutrient loading to wetlands. Conflicting results on impacts of nitrogen loading to coastal wetland soils have been reported, though most studies have investigated short-term impacts of nutrient loading, not long-term integrated impacts. I investigated an 11-year period of nutrient loading on soils in an oligohaline coastal wetland. Nitrogen treatments of 0, 50, 200, and 1200 kg ha-1 yr-1 were paired …

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Saccharomyces Cerevisiae Tel1 & Tel2 Role In Dna Double-Strand Break Repairs, Tommy Nhan Trieu Jan 2015

Saccharomyces Cerevisiae Tel1 & Tel2 Role In Dna Double-Strand Break Repairs, Tommy Nhan Trieu

LSU Master's Theses

Genomic DNA is constantly in danger of being damaged by endogenous cellular processes and exogenous agents. Eukaryotes have mechanisms, collectively termed the DNA damage response, that detect and repair DNA damage. After a double-stranded break occurs, protein complexes are recruited to the break site to promote resection. Two main protein kinases involved in DNA repair are the Tel1 and Mec1 proteins. Recent studies have found that the Tel2 protein binds to both the Tel1 and Mec1 proteins and a point mutation of TEL2 on the 129th amino acid disrupts this interaction. Since both of the Tel1 and Mec1 proteins are …

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Comparison Of Occlusal Area And Postcanine Mesiodistal Length In Old World And New World Monkeys, Ashley Marie Franklin Jan 2015

Comparison Of Occlusal Area And Postcanine Mesiodistal Length In Old World And New World Monkeys, Ashley Marie Franklin

LSU Master's Theses

The purpose of this study is to discover the relationship between the number of teeth and the postcanine occlusal area and postcanine mesiodistal length in select OWM and NWM species. New World monkeys (NWM) have 12 premolars, whereas Old World monkeys (OWM) have 8. Four species are studied: Cercopithecus albogularis and Colobus guereza (OWM), and Cebus capucinus and Alouatta palliata (NWM). Two pairs of species are chosen because they are classified as having the same general folivorous and omnivorous diet: Co. guereza and A. palliata, and Cer. albogularis and Ceb. capucinus, respectively. Adult, wild caught, female specimens from the Smithsonian, …

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Evaluation Of Enhanced Efficiency Nitrogen Fertilizers On Corn Production Systems In The Mid-South, Shanice M. Jones Jan 2015

Evaluation Of Enhanced Efficiency Nitrogen Fertilizers On Corn Production Systems In The Mid-South, Shanice M. Jones

LSU Master's Theses

Nitrogen (N) is often the most yield limiting nutrient, particularly in corn (Zea mays L.) production systems. In the Mid-South, high N application rates have the potential to lead to high N loss. To minimize this loss, proper N management should focus on improving N use efficiency (NUE) while optimizing productivity. The potential to achieve both tasks can be met using enhanced efficiency N fertilizer (EENF). However, limited research has directly compared the active chemicals in EENFs for corn production in the Mid-South. A study was conducted in 2013 and 2014 at two locations in Louisiana to determine the effectiveness …

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Current Uses Of Poly(Lactic-Co-Glycolic Acid) In The Dental Field: A Comprehensive Review, Maria Justina Roxana Virlan, Daniela Miricescu, Alexandra Totan, Maria Greabu, Cristiana Tanase, Cristina M. Sabliov, Constantin Caruntu, Bogdan Calenic Jan 2015

Current Uses Of Poly(Lactic-Co-Glycolic Acid) In The Dental Field: A Comprehensive Review, Maria Justina Roxana Virlan, Daniela Miricescu, Alexandra Totan, Maria Greabu, Cristiana Tanase, Cristina M. Sabliov, Constantin Caruntu, Bogdan Calenic

Faculty Publications

Poly(lactic-co-glycolic acid) or PLGA is a biodegradable polymer used in a wide range of medical applications. Specifically PLGA materials are also developed for the dental field in the form of scaffolds, films, membranes, microparticles, or nanoparticles. PLGA membranes have been studied with promising results, either alone or combined with other materials in bone healing procedures. PLGA scaffolds have been used to regenerate damaged tissues together with stem cell-based therapy. There is solid evidence that the development of PLGA microparticles and nanoparticles may be beneficial to a wide range of dental fields such as endodontic therapy, dental caries, dental surgery, dental …

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Applications Of Geopolymer In Civil Engineering: Feasibility Study Of Loess Stabilization And Waste Concrete Recycling, Zhen Liu Jan 2015

Applications Of Geopolymer In Civil Engineering: Feasibility Study Of Loess Stabilization And Waste Concrete Recycling, Zhen Liu

LSU Doctoral Dissertations

The fast growing population and economic development have resulted in an increasing demand for residential and commercial buildings and infrastructures. However, there are problems identified to fulfill this demand, including that (1) problematic soils need to be treated/improved before the construction of building and infrastructures; (2) the Portland cement industry, which is used for concrete production and as the conventional soil stabilizer, is not environment friendly; (3) qualified natural aggregates for concrete production are being depleted; and (4) great amount of construction & demolition waste (C&D waste) is being produced every year. This means that green materials and recycling the …

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Physics And Applications Of A Pdms Based Centrifugal Microfluidic System, Ziliang Cai Jan 2015

Physics And Applications Of A Pdms Based Centrifugal Microfluidic System, Ziliang Cai

LSU Doctoral Dissertations

The objective of this research work is to develop a centrifugal microfluidic system for general purposes based on microfabrication technologies including SU-8 photolithography, polydimethylsiloxane (PDMS) casting. The main contribution of this research is to integrate a flyball governor system into the polymer based centrifugal microfluidic platform. A series of function units are developed based on this unique mechanism. In the first part, three pinch valve systems were designed and tested. The first one is based on the magnetic force and the second one is on the basis of spring force and the last one is a membrane valve. All valving …

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Parental Age At Conception: An Examination Of Risk Factors Related To Autism Severity And Comorbid Psychopathology, Robert D. Rieske Jan 2015

Parental Age At Conception: An Examination Of Risk Factors Related To Autism Severity And Comorbid Psychopathology, Robert D. Rieske

LSU Doctoral Dissertations

Many researchers have cited the continuing increase in the prevalence of autism worldwide and have speculated on the potential causes of that increase. One theory that suggests at least a contributory effect is the general trend for parents to have children at later ages. Previous research has begun to examine the relationship between advanced parental age at conception and the incidence of autism and have noted strong relationships between advanced parental age and other developmental disabilities. The purpose of this study was to not only confirm the relationship between advanced parental age and autism risk but to extend that knowledge …

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Utilization Of The Alabama Parenting Questionnaire Across Family Structures: Do The Same Constructs Apply?, Leah Michelle Adams Jan 2015

Utilization Of The Alabama Parenting Questionnaire Across Family Structures: Do The Same Constructs Apply?, Leah Michelle Adams

LSU Doctoral Dissertations

America has experienced a marked increase in non-nuclear family structures over the last five decades. The evolution of more diverse family systems has led some researchers to eschew a “one size fits all” approach to parenting assessment, as these measures may neglect or misconstrue parent-child dynamics unique to non-nuclear families. The current study examined the underlying factor structure of the Alabama Parenting Questionnaire (APQ) in two distinct family structures to determine if parenting constructs were replicated across groups. Participants included 246 mothers from single parent and two-parent households in Louisiana. Statistical analyses included exploratory factor analysis, replication analysis, hierarchical regression …

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The Erotics Of Race Suicide: The Making Of Whiteness And The Death Drive In The Progressive Era, 1880-1920, Madoka Kishi Jan 2015

The Erotics Of Race Suicide: The Making Of Whiteness And The Death Drive In The Progressive Era, 1880-1920, Madoka Kishi

LSU Doctoral Dissertations

"The Erotics of Race Suicide" examines the frequent representation of suicide in Progressive Era American literature in light of a widely proclaimed socio-political concept of the time: “race suicide.” Coined by the sociologist Edward Ross, the term “race suicide” nominates a nativist fear over the racial enervation of indigenous white Americans. Ross and other commentators on race suicide, most notably Theodore Roosevelt, proclaimed that the diminution of the indigenous white Americans was caused by their unwillingness to breed, signaling the self-destructive, “suicidal” tendency of the race. Consequently, through such means as the enactment of immigration restrictions, the reinforcement of anti-miscegenation …

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A Trust-Based Relay Selection Approach To The Multi-Hop Network Formation Problem In Cognitive Radio Networks, Brandy Michelle Tyson Jan 2015

A Trust-Based Relay Selection Approach To The Multi-Hop Network Formation Problem In Cognitive Radio Networks, Brandy Michelle Tyson

LSU Doctoral Dissertations

One of the major challenges for today’s wireless communications is to meet the growing demand for supporting an increasing diversity of wireless applications with limited spectrum resource. In cooperative communications and networking, users share resources and collaborate in a distributed approach, similar to entities of active social groups in self organizational communities. Users’ information may be shared by the user and also by the cooperative users, in distributed transmission. Cooperative communications and networking is a fairly new communication paradigm that promises significant capacity and multiplexing gain increase in wireless networks. This research will provide a cooperative relay selection framework that …

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Release, Stability And Functionality Of Nanodelivered Hydrophobic (Lutein And Beta-Carotene) And Hydrophilic (Folic Acid) Antioxidants Using Zein Nanoparticles, Thanida Chuacharoen Jan 2015

Release, Stability And Functionality Of Nanodelivered Hydrophobic (Lutein And Beta-Carotene) And Hydrophilic (Folic Acid) Antioxidants Using Zein Nanoparticles, Thanida Chuacharoen

LSU Doctoral Dissertations

Nanodelivery systems enable innovations that can benefit foods and human health on a large scale in the coming years. The instabilities of antioxidants during food processing and during digestion are drawbacks that can be successfully addressed by nanoentrapment. This research provided technical strategies to synthesize zein nanoparticles loaded with hydrophobic/hydrophilic antioxidants, and to study the release profiles and physical stability of nanocarriers and chemical stability of entrapped bioactives under on-shelf and GI conditions. The results supported the potential of zein nanoparticles stabilized by surfactants to improve chemical stability of entrapped lutein, and to slowly release lutein under PBS conditions. Same …

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Developing Co-Current And Counter-Current Spray Drying Computational Fluid Dynamics (Cfd) Simulation Studies To Predict The Quality Of Microencapsulated Fish Oil With Egg White Hydrolysates Powders, Kevin Estuardo Mis Solval Jan 2015

Developing Co-Current And Counter-Current Spray Drying Computational Fluid Dynamics (Cfd) Simulation Studies To Predict The Quality Of Microencapsulated Fish Oil With Egg White Hydrolysates Powders, Kevin Estuardo Mis Solval

LSU Doctoral Dissertations

Eggs are an excellent source of high quality protein containing all essential amino acids (EAA) including leucine. Food-grade protein hydrolysates can enhance the growth of lactic acid bacteria (LAB). Thermal degradation of bioactives normally occurs during microencapsulation by spray drying. Spray drying modeling using computational tools is essential to engineer new food powders and to minimize and thermal degradation of bioactives. The first chapter of this work discusses the optimization of an enzymatic process in terms of reaction temperature, pH, enzyme:substrate ratio, and reaction time using a response surface methodology (RSM) to produce food-grade protein hydrolysates from egg whites (EWH). …

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Insights Into The Development Of Chemotherapeutics Targeting Pfkfb Enzymes, Robert Blake Crochet Jan 2015

Insights Into The Development Of Chemotherapeutics Targeting Pfkfb Enzymes, Robert Blake Crochet

LSU Doctoral Dissertations

The PFKFB enzymes control the primary checkpoint in the glycolytic pathway and are implicated in a multitude of diseases: from cancer, to schizophrenia, to diabetes, and heart disease. The inducible isoform, PFKFB3, is known to be associated with the upregulation of glycolysis in many cancers. The first study within this work investigates the potential for using tier-based approaches of virtual screening to target small molecule kinases, with PFKFB3 serving as a case study. For this investigation, bioactive compounds for PFKFB3 were identified from a compound library of 1364 compounds via high-throughput screening, with bioactive compounds being further characterized as either …

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Boron Functionalization Of Bodipy Dyes, And Their Evaluation As Bioimaging Agents, Alex Long Nguyen Jan 2015

Boron Functionalization Of Bodipy Dyes, And Their Evaluation As Bioimaging Agents, Alex Long Nguyen

LSU Doctoral Dissertations

BODIPY, also known as “porphyrin’s little sister,” belongs to a class of fluorescent dyes. It contains a dipyrromethene π-system with a disubstituted boron atom. The basic 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) is known for its numerous useful applications in the fields of biology and materials. Modification of this well-known fluorophore has been shown to change its photophysical and chemical properties. There has been great interest in the modification at the boron center in recent years for synthesizing new dyads and cascade-type dyes. This work focuses on functionalization at the boron center with carbon and oxygen nucleophiles for further investigation as bioimaging agents. Chapter …

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Selective Enrichment Through Capture (Sec): A Technology For Retrieving Specific Dna Sequences From Complex Mixtures, Kelley Gwin Nunez Jan 2015

Selective Enrichment Through Capture (Sec): A Technology For Retrieving Specific Dna Sequences From Complex Mixtures, Kelley Gwin Nunez

LSU Doctoral Dissertations

The capacity to selectively target DNA sequences within a complex mixture is a useful feature for genomic studies. Several methods aimed at undertaking this feat have utilized biotinylated oligonucleotides and streptavidin beads to capture DNA but have low efficiencies, require PCR, or cannot be combined with high-throughput sequencing. The work presented here developed a protocol referred to as selected enrichment through capture (SEC) that uses a biotinylated “capture primer” to target and concentrate specific DNA sequences at high efficiencies, eliminates the use of PCR, and can be combined with high-throughput sequencing. The effectiveness of SEC was evaluated in a series …

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Developing Recognition Criteria For Current-Wave-Enhanced Sediment Gravity Flows, Kathryn Christine Denommee Jan 2015

Developing Recognition Criteria For Current-Wave-Enhanced Sediment Gravity Flows, Kathryn Christine Denommee

LSU Doctoral Dissertations

Sedimentary fabrics preserved in the rock record provide some of the best evidence for interpreting paleo-depositional conditions. Muddy sediments in particular are important paleoenvironmental archives, preserving the most complete stratigraphic record of any rock type in basinal settings. However, the full range of mechanisms responsible for the deposition of muddy sediments, particularly in high-energy settings, remains poorly understood. Although frequently observed in modern settings, muddy prodeltaic deposits are rarely identified in the rock record, in part because no catalogue of easily distinguishable recognition criteria exists for this class of mudstones. In order to help overcome this deficiency, this dissertation project …

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A Spatial Analysis Of Obesity And Its Associations With The Built And Natural Environment, Physical Inactivity, And Socioeconomic And Demographic Conditions In The United States Of America, Mustafa Erdem Jan 2015

A Spatial Analysis Of Obesity And Its Associations With The Built And Natural Environment, Physical Inactivity, And Socioeconomic And Demographic Conditions In The United States Of America, Mustafa Erdem

LSU Doctoral Dissertations

Obesity has strong genetic determinants but the genetic composition of the population does not change rapidly. Thus in this study, the major changes in non-genetic factors such as the development of obesogenic environments and shifting socioeconomic status and lifestyle of individuals are hypothesized to increase the risk of obesity. As the prevalence of obesity continue to increase worldwide with substantial attention in the US, a clearer understanding of how spatial associations between obesity and confounding factors are interrelated is crucial to better tackle the issue of obesity. This study employs the ‘global’ and ‘local’ Exploratory Spatial Data Analysis (ESDA) methods …

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I. Synthesis Of Ascarosides For Biological Evaluation And Ii. Development Of Visible Light-Promoted Selenofunctionalization And Grafting Of Aryl Iodides, Elizabeth Susan Conner Balapitiya Jan 2015

I. Synthesis Of Ascarosides For Biological Evaluation And Ii. Development Of Visible Light-Promoted Selenofunctionalization And Grafting Of Aryl Iodides, Elizabeth Susan Conner Balapitiya

LSU Doctoral Dissertations

This dissertation focuses on analog synthesis for biological evaluation and visible light promoted method development. Chapter 1 centers upon the synthesis of Caenorhabditis elegans dauer pheromone analogs. C. elegans is a nematode which, in times of environmental stress, enters a dauer stage. Two highly conserved pathways, which play important roles in some diseases in higher organisms, monitor dauer formation: TGF-β and IGF-1. Dauer formation is triggered by the nematode’s chemosensation of the dauer pheromone, consisting of a group of previously-isolated ascarosides. These compounds differ in chain length, saturation, terminal functionality of side chain, ω vs. ω-1 oxygenation and presence of …

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Optimal Location Of Biomethane Gas Manufacturing Plants And Allocation Of Feedstock And Liquified Carbon Product, Bingqing Wu Jan 2015

Optimal Location Of Biomethane Gas Manufacturing Plants And Allocation Of Feedstock And Liquified Carbon Product, Bingqing Wu

LSU Doctoral Dissertations

Biomethane gas (BMG), known for its sustainability, low environmental impact, and high profitability, has received wide attention in recent years. To facilitate the process of making strategic plans for building a BMG production system, this dissertation leverages the mathematical modeling and optimization techniques to minimize the supply chain cost for such a system. Typical elements in a BMG production system consist of the local farms that produce the feedstock, the hubs that collect and store the feedstock produced by farms, the reactors that generate BMG from the feedstock transported from the hubs, the condensers that liquefy the BMG from the …

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Visual Representations Of Gender In Engineering Trade Journals Of Professional Societies During 1998-2012: A Content Analysis Of Hierarchy And Stereotypes, Tracy Ettel Morris Jan 2015

Visual Representations Of Gender In Engineering Trade Journals Of Professional Societies During 1998-2012: A Content Analysis Of Hierarchy And Stereotypes, Tracy Ettel Morris

LSU Doctoral Dissertations

Recruiting and retaining women in engineering have stagnated since the mid-1990's partially due to the marginalization of women in education and the workforce. This research analyzed the quality and quantity of representation of women and men in visual images of professional science and engineering trade journals to illuminate the marginalizing climate of engineering. A mixed methods approach using visual content analysis was performed for a 15-year period during 1998-2012 of three different trade journals of professional societies representing various disciplines of engineering: the first has a low percentage of women, the second has a higher percentage of women, and the …

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