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Assessment Of Herbicides For Control Of Non-Native Species: Italian Ryegrass (Lolium Perenne Spp. Multiflorum), Tropical Spiderwort (Commelina Benghalensis), And Tropical Soda Apple (Solanum Viarum), Ernest Kwaku Kraka Dec 2012

Assessment Of Herbicides For Control Of Non-Native Species: Italian Ryegrass (Lolium Perenne Spp. Multiflorum), Tropical Spiderwort (Commelina Benghalensis), And Tropical Soda Apple (Solanum Viarum), Ernest Kwaku Kraka

Theses and Dissertations

Herbicides were evaluated for control of non-native and invasive plants namely tropical soda apple (TSA) (Solanum viarum), tropical spiderwort or Benghal dayflower (Commelina benghalensis), and Italian ryegrass (Lolium multiflorum) from 2007 to 2012 in greenhouse at Plant Science Research Center, Mississippi State University, Starkville-Mississippi. In TSA study, aminopyralid at 0.88 or 0.12 kg ae/ha, and triclopyr + picloram + 2,4-D at (0.56 + 0.15 + 0.56) kg ae/ha controlled TSA seedlings emergence ranged from 83 to 96% at premergence (PRE), and 1 month after treatments (MAT). All herbicides failed to provide more than 63% control of TSA at 3 and …

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Development Of A High Throughput Surfactant Screening Procedure Using Shikimic Acid Analysis, Cody Alan Massey Dec 2012

Development Of A High Throughput Surfactant Screening Procedure Using Shikimic Acid Analysis, Cody Alan Massey

Theses and Dissertations

In field efficacy trials most glyphosate/surfactant combinations tested control barnyardgrass as well as preormulated glyphosate products 21 days after treatment (DAT). Preormulated glyphosate products controlled barnyardgrass quicker than combination treatments, most likely due to improved glyphosate formulations with improved surfactant systems. In greenhouse trials, preormulated glyphosate products exhibited greater fresh weight reductions across all species tested, including barnyardgrass, broadleaf signalgrass, hemp sesbania, johnsongrass, large crabgrass, pitted morningglory, prickly sida, sicklepod, yellow foxtail and Palmer amaranth. Nonionic tallow amine treatments exhibited variable control among species. A shikimate analysis was developed using non-glyphosate-tolerant soybean to estimate efficacy of surfactants; data were then …

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A Classification System For Large Reservoirs Of The Conterminous U.S, Rebecca Misaye Krogman Dec 2012

A Classification System For Large Reservoirs Of The Conterminous U.S, Rebecca Misaye Krogman

Theses and Dissertations

Reservoirs represent a relatively young element of the U.S. landscape, with most reservoirs being built within the last century. Despite their recreational, ecological, and socioeconomic importance, reservoirs nationwide are suffering from severe habitat degradation. Habitat impairments related to siltation, eutrophication, poor water quality, water regime, lack of submerged structure, and macrophyte invasions affect reservoirs to differing degrees in different reservoirs. To adequately assess these issues, we needed to develop a classification system within which an assessment mechanism could function. I collected data for large reservoirs across the conterminous U.S. regarding fish habitat impairments and status of the fish community and …

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Novel Algorithms For Cross-Ontology Multi-Level Data Mining, Prashanti Manda Dec 2012

Novel Algorithms For Cross-Ontology Multi-Level Data Mining, Prashanti Manda

Theses and Dissertations

The wide spread use of ontologies in many scientific areas creates a wealth of ontologyannotated data and necessitates the development of ontology-based data mining algorithms. We have developed generalization and mining algorithms for discovering cross-ontology relationships via ontology-based data mining. We present new interestingness measures to evaluate the discovered cross-ontology relationships. The methods presented in this dissertation employ generalization as an ontology traversal technique for the discovery of interesting and informative relationships at multiple levels of abstraction between concepts from different ontologies. The generalization algorithms combine ontological annotations with the structure and semantics of the ontologies themselves to discover interesting …

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Improving Commercial Broiler Attic Inlet Ventilation Through Data Acquisition Coupled With Cfd Analysis, Jonathan William Wiley Olsen Dec 2012

Improving Commercial Broiler Attic Inlet Ventilation Through Data Acquisition Coupled With Cfd Analysis, Jonathan William Wiley Olsen

Theses and Dissertations

The use of solar heated attic air is an area of increasing interest in commercial poultry production. Attic inlets satisfy the demand for alternative heating while being simple to implement in an existing poultry house. However, little attention has been given to the configuration of the attic space and its influence on thermal energy extraction. This issue was approached in a threefold manner: i.) test case experimental data for the operation of attic inlets in an east-west oriented commercial broiler house was recorded, ii.) a two-dimensional computational fluid dynamics (CFD) attic inlet ventilation model (AIVM) was developed and verified using …

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Bacteria And Their Effects On Fertility In The Chicken, Melissa Dawn Haines Dec 2012

Bacteria And Their Effects On Fertility In The Chicken, Melissa Dawn Haines

Theses and Dissertations

Pathogenic and non-pathogenic bacteria that are commonly associated with Poultry include: Salmonella, E. coli, Campylobacter, Clostridium, Lactobacillus, and Bifidobacterium. These bacteria are often transmitted to the bird from the environment and sometimes to the offspring which may affect bird performance and health. Therefore, the objective of our first experiment was to determine if rooster semen exposed to these bacteria had an effect on sperm motility. Our results indicated that all 6 bacteria lowered sperm motility but the 2 non-pathogenic bacteria, eliminated sperm motility immediately after exposure. These results led to the second experiment which was to determine if semen exposed …

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An Assessment Of Campus Police Departments Across Mississippi's Public Community And Junior Colleges, Brad D. Boggs Dec 2012

An Assessment Of Campus Police Departments Across Mississippi's Public Community And Junior Colleges, Brad D. Boggs

Theses and Dissertations

The purpose of the study was to provide an assessment of campus police departments throughout the 15 public community and junior colleges in Mississippi. This research could provide Mississippi community and junior college administrators the opportunity to observe and appraise the overall safety of their respective campuses in comparison to safety practices of the other campus police departments in the state. This study will lay the foundation for further research of campus police departments and can assist administrators and boards of trustees of Mississippi’s public community and junior colleges with annual and long-range planning efforts. This study included campus police/security …

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Populus Species And Hybrids For Use On Bottomland And Upland Sites In The Southern United States, Bryce D. May Dec 2012

Populus Species And Hybrids For Use On Bottomland And Upland Sites In The Southern United States, Bryce D. May

Theses and Dissertations

The objective of this research is to evaluate the performance of Populus species and hybrid poplars in short rotation biomass production systems. Eastern cottonwood and hybrid clones were evaluated at both an alluvial and upland test site in 2010 and 2011. Age-one and age-two measurements included tree survival, total height, and overall health. Age-two measurements also included breast height diameter and volume. Generally, eastern cottonwoods exhibited greater growth than hybrid clones on the alluvial site while the reverse was true for the upland site. Faster tree growth occurred on the alluvial site, but foliage diseases were more prevalent. Hybrids showed …

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Conceptual Change: The Integration Of Geologic Time Into The Teaching Of Evolution, David L. Ramseyer Dec 2012

Conceptual Change: The Integration Of Geologic Time Into The Teaching Of Evolution, David L. Ramseyer

Theses and Dissertations

This study attempts to discern if geologic time is a threshold concept for student understanding of evolutionary theory. A threshold concept enables the learner to unpack other concepts because of its importance in thought construction. In this study three teachers and ten sections of biology were investigated from the same high school. Each teacher used the same activities, in the same sequence, and with identical evaluation methods. Students in the treatment group covered a unit on geologic time prior to completing course work on evolutionary theory. Student misconceptions in both control and treatment groups were assessed using a composite concept …

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Effects Of Preblending And Water Addition On Physical And Sensory Characteristics Of Seasoned Pork Patties, Molly Sheppard Field Dec 2012

Effects Of Preblending And Water Addition On Physical And Sensory Characteristics Of Seasoned Pork Patties, Molly Sheppard Field

Theses and Dissertations

The objective of this study was to establish the consumer acceptability of preblended and nonpreblended post rigor seasoned pork patties with added water levels of 0, 3, 6, and 9 percent for each formula. Other parameters measured were proximate analysis, texture, cooking loss, and consumer acceptability. Nonpreblended treatments had a higher (P<0.05) percentage of protein and a lower (P<0.05) percentage of fat as compared to preblended treatments. Texture analysis revealed a lower (P<0.05) amount of total energy required to shear through a single patty in preblended treatments than nonpreblended treatments. No differences (P>0.05) were detected among treatments at varying water levels. Consumer acceptability showed no differences (P>0.05) among selected treatments. Consumer acceptability scores indicated that consumers would consume both preblended and nonpreblended seasoned pork patties at varying water levels.

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Effects Of Supplemental Citrulline Malate During A Resistance Training Protocol, William Kinnard Luckett Dec 2012

Effects Of Supplemental Citrulline Malate During A Resistance Training Protocol, William Kinnard Luckett

Theses and Dissertations

Ergogenic L-citrulline and malate are amino acids used in specific combination to effect muscular endurance during athletic performances. Purpose: The study aimed to investigate the ergogenic properties of citrulline-malate (CM) during a resistance training protocol. Methods: Utilizing a randomized, counterbalanced, double blind study, fifteen trained males completed a resistance training protocol once using placebo (PL) and once with CM (8.0g). Results: CM supplementation increased repetitions in chin-ups, reverse chin-ups, push-ups, and total trial repetitions. Blood lactate was significantly increased post-exercise compared to pre-exercise, but was not significantly different between CM and placebo. Further, a significant interaction effect was revealed for …

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Digital Infrared Thermal Imaging And Its Use In Domestic And Non-Domestic Species, Susan Denise Bowers Dec 2012

Digital Infrared Thermal Imaging And Its Use In Domestic And Non-Domestic Species, Susan Denise Bowers

Theses and Dissertations

Digital infrared thermal imaging (DITI) is a non-invasive diagnostic technique that is used to detect symmetry and asymmetry of surface temperature gradients. DITI can examine many different aspects of thermal physiology and diagnose injury and disease. The objectives of this study were (1) to investigate the use of DITI to determine whether differences in temperature gradients exist between late gestation and non-pregnant mares, (2) to evaluate whether velvet antler (VA) temperature gradients, as measured by DITI would pattern VA growth, and (3) to determine if “normal” temperature gradients of the foot exist among elephants as detected using DITI. To investigate …

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Ecology Of The Tick-Borne Pathogen, Rickettsia Parkeri, In Its Primary Vector, Amblyomma Maculatum, And Select Vertebrate Hosts, Gail Miriam Moraru Dec 2012

Ecology Of The Tick-Borne Pathogen, Rickettsia Parkeri, In Its Primary Vector, Amblyomma Maculatum, And Select Vertebrate Hosts, Gail Miriam Moraru

Theses and Dissertations

Rickettsia parkeri is a tick-borne microorganism, only recently recognized to cause disease in humans. The ecology of this disease is largely unknown, and was addressed through a series of laboratory and field investigations. Feeding behavior of immature stages of the primary vector, Amblyomma maculatum, on mammalian, avian, and reptilian host models was investigated. It was determined that this tick does not feed on anoles, and nymphs do display longer periods of attachment to and are significantly heavier having fed on cotton rats as compared with quail. Field surveys indicate evidence of exposure to spotted fever group rickettsiae in small mammals …

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Effect Of Hand Pinching, Dikegulac-Sodium, And Gibberellic Acid On Chile Pepper (Capsicum Annuum), Abdulfatah Mousa Dec 2012

Effect Of Hand Pinching, Dikegulac-Sodium, And Gibberellic Acid On Chile Pepper (Capsicum Annuum), Abdulfatah Mousa

Theses and Dissertations

Hand Pinching increased branching and fruit yield. At first harvest dikegulac-sodium at 50 ppm increased fruit yield compared to the control. However, dikegulac sodium at 100 ppm reduced fruit yield initially but had no effect on fruit yield at 2-4th harvests. Digkegulac-sodium, Gibberellic acid, and hand pinching did not affect fruit length at third and fourth harvests. However, first and second harvests dikegulac sodium reduced fruit length whereas GA3 had no effect. None of the treatments affected fruit width. Dikegulac sodium and Hand pinching increased the number of branches after three weeks, but GA3 did not. At 8 weeks after …

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Cryopreservation Of Equine Spermatozoa: Identification Of Good And Poor Freezer Stallions And Effect Of Sperm Density Per Straw, Abed Sharqy Fahad Dec 2012

Cryopreservation Of Equine Spermatozoa: Identification Of Good And Poor Freezer Stallions And Effect Of Sperm Density Per Straw, Abed Sharqy Fahad

Theses and Dissertations

This study was carried out primarily to evaluate the cryo-tolerance of equine semen from four stallions through assessing the spermatozoa motion characteristics with Computer-Assisted Sperm Analysis (CASA). Four stallions were collected during the breeding season (summer). For each ejaculate, fresh and cryopreserved samples were taken for sperm motility characteristics evaluation. Data analysis demonstrated that sperm cells of stallions were significantly affected by (P<0.05) cryodamage. Stallion (A) was cryotolerant, and was classified as a good freezer, whereas stallion (D) was not and classified as a poor freezer regardless of the concentration of sperm. In addition, a concentration of 0.4 x 109 sperm cells/ml had higher percentages of rapid sperm and velocity parameters (P<0.05) compared to 0.8 x 109 sperm/ml. Further research is necessary to identify potential biomarkers for good and poor freezer stallions.

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A Procedure Using Rotylenchulus Reniformis Nucleotide Sequences To Quantitatively Measure Plant-Parasitic Nematode Infestation Levels Using Metagenomic Dna Isolated Directly From Soil, Kurtis C. Showmaker Dec 2012

A Procedure Using Rotylenchulus Reniformis Nucleotide Sequences To Quantitatively Measure Plant-Parasitic Nematode Infestation Levels Using Metagenomic Dna Isolated Directly From Soil, Kurtis C. Showmaker

Theses and Dissertations

Molecular diagnostic tests have been developed and utilized to diagnose and to confirm diagnoses of many plant-parasitic nematodes. We evaluate the potential of a qPCR assay to detect and quantify Rotylenchulus reniformis in Mississippi directly from soil. A novel pipeline utilizing multiple databases containing nematode DNA and EST sequences was developed to aid in the selection of R. reniformis primers used in a PCR and qPCR assays. In vitro testing showed that the primers and probes developed from the novel pipeline for the qPCR assays could accurately detect the presence of R. reniformis. Subsequent testing resulted in a trend of …

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Enhancing Levoglucosan Formation During Fast Pyrolysis Of Lignocellulosic Biomass, Qi Li Dec 2012

Enhancing Levoglucosan Formation During Fast Pyrolysis Of Lignocellulosic Biomass, Qi Li

Theses and Dissertations

Levoglucosan is the major anhydrosugar component of bio-oil produced by fast pyrolysis. Previous research has shown that levoglucosan yield can be greatly increased if a mild acid pretreatment is applied to demineralize the feedstock prior to pyrolysis. The interest in levoglucosan production is that it provides a route to production of monomeric sugars, primarily glucose, which can be utilized to produce biochemically derived fuels (ethanol, butanol, etc.) In one study, four different lignocellulosic biomass were subjected to pyrolysis as feedstocks to produce bio-oils via fast pyrolysis in a 7 kg/h feed rate auger reactor. Feedstocks were pretreated with dilute phosphoric …

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Enhancing Plant Tolerance To Cold, Heat And Drought Through The Use Of Selected Plant Health Protectants, Diana Renae Cochran Dec 2012

Enhancing Plant Tolerance To Cold, Heat And Drought Through The Use Of Selected Plant Health Protectants, Diana Renae Cochran

Theses and Dissertations

Studies were conducted to evaluate the effects of plant health protectants Pageant (pyraclobstrobin + boscalid), Regalia (extract of Reynoutria sachalinensis) and MBI-501 (an anti-transpirant) on drought, heat and cold tolerance. To measure effects on drought tolerance, Pageant, Regalia or MBI-501 were foliar applied to impatiens at four rates (0.0×, 0.5×, 1.0×, and 1.5×) based on the label rates of 0.228 g·L-1 (Pageant), 10 mL·L-1 (Regalia) and 2 mL·L-1 (MBI-501) and to tomato plants at two rates (0.0× and 1.0×) based on the label rates of 0.559 g·L-1 (Pageant), 10 mL·L-1 (Regalia) and 2 mL·L-1 (MBI-501) grown with different target substrate …

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Estimating And Modeling Red Oak Acorn Yield And Abundance In The Mississippi Alluvial Valley, Jacob N (Jacob Nathaniel) Straub Dec 2012

Estimating And Modeling Red Oak Acorn Yield And Abundance In The Mississippi Alluvial Valley, Jacob N (Jacob Nathaniel) Straub

Theses and Dissertations

Red oaks (Quercus spp.; Section Erythrobalanus) produce acorns which are valuable forage for wildlife especially mallards (Anas platyrhynchos) and wood ducks (Aix sponsa). Scientists have limited information on amount, timing, and persistence of these acorns in the Mississippi Alluvial Valley (MAV). Conservation planners rely on precise estimates of acorns and other forage to estimate habitat needed by waterfowl in the MAV and other regions. My study provided premiere landscape-scale, multi-year estimates of red oak acorn yield and on-ground abundance in the MAV. Mean yield of acorns was 534 kg(dry)/ha (42.3 acorns/ m2) across all sites, years (falls-winters 2009-2012), and oak …

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Evaluation Of B-Mode And Color Doppler Ultrasound As Alternative Tools For The Study Of Reproduction, Temperament, And Milk Production- Related Variables In The Bovine, Hector Luis Sanchez-Rodriguez Dec 2012

Evaluation Of B-Mode And Color Doppler Ultrasound As Alternative Tools For The Study Of Reproduction, Temperament, And Milk Production- Related Variables In The Bovine, Hector Luis Sanchez-Rodriguez

Theses and Dissertations

An adequate vascular perfusion status is essential not only to maintain life, but to ensure the proper physiology of the different systems that form the animal’s body. Due to its role in the transport of oxygen and nutrients toward, and the removal of cellular waste products away from the body’s tissues, the circulatory system is responsible for the maintenance of body homeostasis. Production related functions in farm animals are not an exception, and directly depend on sufficient vascular physiology. In the past, the study of blood flow in large domestic species was restricted to highly invasive techniques. However, even when …

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Evaluation Of Wildrye (Elymus Sp.) As A Potential Forage And Conservation Planting For The Southeastern United States, Jason Brett Rushing Dec 2012

Evaluation Of Wildrye (Elymus Sp.) As A Potential Forage And Conservation Planting For The Southeastern United States, Jason Brett Rushing

Theses and Dissertations

In the southeastern United States, there is a need for a native, cool-season grass component for restoring and reclaiming grasslands and providing quality forage for livestock. Experiments were conducted on southeastern wildrye [Elymus glabriflorus (Vasey) Scribn. & C.R. Ball] to assess agronomic parameters, and establish a base of information for use in future research and breeding programs. Optimal germination requirements (temperature, light, pH, and physical dormancy) were evaluated. Our data suggests that for southeastern wildrye, the optimal temperature required for germination is between 15 and 20oC. Light treatments (constant dark, constant light, short day, and long day) did not influence …

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L222w Of Hemagglutinin Affects The Receptor Binding Affinity Of Avian Origin H3n2 Canine Influenza Virus, Guohua Yang Dec 2012

L222w Of Hemagglutinin Affects The Receptor Binding Affinity Of Avian Origin H3n2 Canine Influenza Virus, Guohua Yang

Theses and Dissertations

Emergence of avian origin and equine origin canine influenza viruses (CIVs) in Asia and the United States brings important concerns. Humans are in closer and more frequent contact with dogs than other common hosts of influenza. Thus, CIV is a potential threat to human health. However, little is known about the determinants of CIV host tropism or the transmissibility of CIVs to humans. An amino acid change (W222L) was implicated in modifying hemagglutinin receptor binding by CIV. This was tested using reverse genetics, glycan microarray and virus histochemistry. Glycan microarray demonstrated that avian-origin CIV (H3N2-222W) bind predominantly to alpha-2, 3 …

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Field Survey Of Native And Non-Native Subterranean Termites In Southeastern United States Forests, Nathan Allen Blount Dec 2012

Field Survey Of Native And Non-Native Subterranean Termites In Southeastern United States Forests, Nathan Allen Blount

Theses and Dissertations

Subterranean termites are ecologically and economically important insects that play major roles in organic matter decomposition and nutrient cycling. The Formosan subterranean termite, Coptotermes formosanus Shiraki, is an invasive species known to cause significant damage in urban areas through aggressive consumption of wooden structures and infestations of living trees. Little is known about the presence and impact of C. formosanus in forested ecosystems of the southeastern U.S. as the majority of studies have taken place in urban settings. This study investigates the prevalence of C. formosanus in localized forests, as well as the utilization of living trees by C. formosanus …

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Hearth And Home: Life In And Around A "Kitchen" From Ancient Judah As Excavated At Tell Halif, Tim Frank Dec 2012

Hearth And Home: Life In And Around A "Kitchen" From Ancient Judah As Excavated At Tell Halif, Tim Frank

Theses and Dissertations

A room with many well-preserved artifacts was excavated at Tell Halif in a level associated with Ancient Judah. By using analogy the use of these artifacts can be compared with that of other similar objects. Analogy is at the heart of archaeological interpretation and allows a more explicit determination of the possible uses of artifacts and their patterning. The artifacts serve as evidence for reconstructing life in and around an archaeologically excavated space. By discerning the patterns of artifact distribution we can interpret how the space might have been used. The room excavated at Tell Halif has strong evidence for …

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Fungal Communities On Flooded Building Materials, Frederick Skrobot Iii Dec 2012

Fungal Communities On Flooded Building Materials, Frederick Skrobot Iii

Theses and Dissertations

Flood waters will penetrate the wall cavities of a home and the wall materials then serve as a substrate for mold development. This study measured the effect of flooding and subsequent drying on the extent and type of mold on different residential wall materials. Wet and dry wall samples were analyzed by cloning and sequencing and twenty-one mold species were identified from above and below the water line. Real-time PCR quantitated selected species on fiberglass batt insulation, gypsum wallboard, wood stud, plywood panels, vinyl siding, and house wrap. The mold species found in the highest concentration were Aspergillus fumigatus, Paecilomyces …

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Gender Differences In Parenting Dimensions And Contraceptive Use At First Sexual Intercourse, Sherelle Cohen Dec 2012

Gender Differences In Parenting Dimensions And Contraceptive Use At First Sexual Intercourse, Sherelle Cohen

Theses and Dissertations

This study explores the gender differences in how parents exhibit parenting dimensions (control, monitoring, support and warmth) towards sons and daughters and how those dimensions influence contraceptive use. The data analysis uses the Add Health data and the sample includes 918 adolescents within two-parent homes. This study adds to the existing literature in three ways. First, this study investigates four different parenting dimensions whereas previous research focuses on control and communication. Second, this study looks at how each dimension influences contraceptive use. Third, this study examines how parents exhibit parenting dimensions differently towards sons and daughters and whether each dimension …

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Generation Of Biodiesel And Carotenoids From Rhodotorula Glutinis Using Sweet Sorghum Juice, Miriam Llanto Revellame Dec 2012

Generation Of Biodiesel And Carotenoids From Rhodotorula Glutinis Using Sweet Sorghum Juice, Miriam Llanto Revellame

Theses and Dissertations

The growth of Rhodotorula glutinis in sweet sorghum juice in three levels of three factors of temperature, carbon to nitrogen ratio and pH was evaluated. Accompanying of this growth was the generation of lipids converted to fatty acid methyl ester (FAMEs) and carotenoids. The optimized condition for maximum biomass and carotenoid accumulation was determined to be at 25C, pH of 5.5 and carbon to nitrogen ratio of 10. This condition yielded 22.7 g/L biomass with specific growth rate of 0.213 hr-1. At this condition the carotenoids generation was also maximum with 2.6 mg/gram biomass, comprising of torularhodin, beta-carotene and torulene. …

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Genomic And Functional Analysis Of Next-Generation Sequencing Data, Philippe Chouvarine Dec 2012

Genomic And Functional Analysis Of Next-Generation Sequencing Data, Philippe Chouvarine

Theses and Dissertations

Advances in next-generation sequencing (NGS) technologies have resulted in significant reduction of cost per sequenced base pair and increase in sequence data volume. On the other hand, most currently used NGS technologies produce relatively short sequence reads (50 - 150 bp) compared to Sanger sequencing (~700 bp). This represents an additional challenge in data analysis, because shorter reads are more difficult to assemble. At this point, production of sequencing data outpaces our capacity to analyze them. Newer NGS technologies capable of producing longer reads are emerging, which should simplify and speed up genome assembly. However, this will only increase the …

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Pond Management Approaches And Effects On Trophic Dynamics, Michael Scott Sherman Dec 2012

Pond Management Approaches And Effects On Trophic Dynamics, Michael Scott Sherman

Theses and Dissertations

Mississippi has an abundance of ponds which provides a number of opportunities for anglers. Several enhancement strategies are used to improve fish production in ponds, including fertilizing and supplemental feeding. These strategies may ignore the potential ecological impacts that may unexpectedly arise, such as prolific plant growth. This study consists of two phases; first, a mesocosm experiment investigating fertilizer application rates (mg P/L) in relation to potential sunfish growth, and second, a replicated pond experiment consisting of four treatments to simulate commonly used enhancement strategies. Mesocosm experiment showed a peak of sunfish growth at the 0.6 mg P/L level and …

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Syngas Production From Biomass Pellets In A Downdraft Gasifier And The Removal Of Oxygen From Syngas, Rui Li Dec 2012

Syngas Production From Biomass Pellets In A Downdraft Gasifier And The Removal Of Oxygen From Syngas, Rui Li

Theses and Dissertations

In pellet production, the parameters, such as densification pressure, temperature, feed moisture content, and coal and biomass concentration, that affected pelletizing and pellet quality were investigated. Gasification was carried out in a downdraft gasifier by using red oak hard wood as the feedstock. The raw syngas primarily contained carbon monoxide (CO), hydrogen (H2), carbon dioxide (CO2), methane (CH4), and nitrogen (N2) as well as contaminants such as ash, water vapor, ammonia, and oxygen. Ash was removed with the filter bag. Water vapor was removed by desiccant absorption. Ammonia was removed by water scrubbing. Oxygen was removed by a CuO/CeO2-Al2O3 catalyst …

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