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Articles 5491 - 5520 of 20451
Full-Text Articles in Entire DC Network
Phylogeny And Floral Character Evolution Of Mentzelia Section Bicuspidaria (Loasaceae), Joshua M. Brokaw, John J. Schenk, Jessica K. Devitt, Destiny J. Brokaw
Phylogeny And Floral Character Evolution Of Mentzelia Section Bicuspidaria (Loasaceae), Joshua M. Brokaw, John J. Schenk, Jessica K. Devitt, Destiny J. Brokaw
Biology
Mentzelia section Bicuspidaria (Loasaceae) is a monophyletic group of desert ephemerals that inhabit the complex, heterogeneous landscapes of the southwestern United States and northwestern Mexico. To investigate species circumscriptions and evolutionary relationships in M. sect. Bicuspidaria, we employed phylogeny reconstructions based on DNA sequences from the plastid trnL-trnF, trnS-trnfM, ndhF-rpl32, and rpl32-trnL regions and the nuclear ribosomal ITS and ETS regions. Due to evidence of discordant relationships reconstructed from the plastid and nuclear partitions, we used coalescent-based methods in addition to concatenated data sets to estimate the species tree. Maximum likelihood reconstructions based on the combined …
Preliminary Investigation Of The Effects Of Sex And Electrical Venom Extraction On Venom Composition In The Southern Devil Scorpion, Vaejovis Carolinianus, Chase Czaykowsky
Preliminary Investigation Of The Effects Of Sex And Electrical Venom Extraction On Venom Composition In The Southern Devil Scorpion, Vaejovis Carolinianus, Chase Czaykowsky
Capstone Research Projects
No abstract provided.
Comparative Study Of Spectral Sensitivity, Irradiance Sensitivity, Spatial Resolution And Temporal Resolution In The Visual Systems Of Aratus Pisonii And Ocypode Quadrata, Ruchao Qian
All HCAS Student Capstones, Theses, and Dissertations
Autrum’s studies (1950, 1958) on terrestrial arthropods first revealed that the visual systems of arthropods reflected their lifestyles and habitats, demonstrating that rapidly moving predatory diurnal species tend to have better temporal resolution than slower moving nocturnal species. In order to test Autrum’s hypothesis that visual adaptions are driven by predator/prey interactions, the visual physiology of a nocturnal fast-moving predatory crab, the Atlantic ghost crab (Ocypode quadrata), and a diurnal herbivorous crab, the mangrove tree crab (Aratus pisonii), was examined and compared. Spectral sensitivity, irradiance sensitivity, and temporal resolution of the crabs were quantified using the …
Effect Of Fire Suppression On Aquatic Invertebrates In Ephemeral Wetlands Embedded In Longleaf Pine Forests, Hailey E. Baker
Effect Of Fire Suppression On Aquatic Invertebrates In Ephemeral Wetlands Embedded In Longleaf Pine Forests, Hailey E. Baker
Honors College Theses
It has been established for many years that longleaf pine forests require the ecological disturbance of fire in order to maintain a balanced ecosystem. However, a crucial part of these forests has become nearly excluded from prescribed burning. Ephemeral wetlands embedded within longleaf pine forests are a unique and dynamic seasonal habitat that provide homes, refuge, and breeding grounds for a large array of taxa. Past research suggests that fire suppression around ephemeral wetlands is causing harm to many species of amphibians and other herpetofauna, especially threatened species like the flatwoods salamander. However, other species have not been as well …
Sexually Dimorphic Alterations In Brain Morphology Of Astrocyte Conditional System Xc- Knockout Mice, Gabrielle Emily Samulewicz
Sexually Dimorphic Alterations In Brain Morphology Of Astrocyte Conditional System Xc- Knockout Mice, Gabrielle Emily Samulewicz
Biology - All Scholarship
Astrocytes play a vital role in orchestrating the precise brain wiring that occurs during development and are essential for maintaining homeostasis into adulthood. The cystine/glutamate antiporter, system xc-, in the central nervous system is especially abundant in astrocytes and itself is known to contribute importantly to the basal extracellular glutamate concentration as well as the intracellular and extracellular glutathione levels, either of which, if perturbed, could alter brain development and/or contribute to degeneration. Thus, to determine whether loss of astrocyte system xc- might alter brain morphology, I studied a conditional astrocyte system xc- knockout mouse (AcKO). Tissue was harvested from …
Sexually Dimorphic Alterations In Brain Morphology Of Astrocyte Conditional System Xc- Knockout Mice, Gabrielle Emily Samulewicz
Sexually Dimorphic Alterations In Brain Morphology Of Astrocyte Conditional System Xc- Knockout Mice, Gabrielle Emily Samulewicz
Renée Crown University Honors Thesis Projects - All
Astrocytes play a vital role in orchestrating the precise brain wiring that occurs during development and are essential for maintaining homeostasis into adulthood. The cystine/glutamate antiporter, system xc-, in the central nervous system is especially abundant in astrocytes and itself is known to contribute importantly to the basal extracellular glutamate concentration as well as the intracellular and extracellular glutathione levels, either of which, if perturbed, could alter brain development and/or contribute to degeneration. Thus, to determine whether loss of astrocyte system xc- might alter brain morphology, I studied a conditional astrocyte system xc- knockout mouse (AcKO). Tissue was harvested from …
The Relationship Between Glucocorticoids And The Humoral Immune Response To Mycoplasma Gallisepticum Challenges In Eastern Bluebirds, Joshua Smith
Honors Theses
Numerous studies have examined relationships between adrenal glucocorticoids and the immune system’s ability to fight disease. The relationship can vary, with glucocorticoids having either stimulatory or inhibitory effects. The pathogenic bacterium Mycoplasma gallisepticum (MG) elicits an adaptive immune response in birds, in which B cells produce MG-specific antibodies to fight the infection and prevent reoccurrence. Previous research found that Eastern Bluebirds that produce the most antibodies in response to MG infection also have the highest glucocorticoid levels. This finding led to the current study investigating whether corticosterone, the primary glucocorticoid in birds, stimulates production of antibodies in response to immune …
Influences Of Anti-Bd Bacteria On Amphibians And Their Microbiomes, Emme L. Schmidt
Influences Of Anti-Bd Bacteria On Amphibians And Their Microbiomes, Emme L. Schmidt
Honors Thesis
The fungal pathogen Batrochochytrium dendrobatidis (Bd) has been threatening amphibian populations across the globe. Recent work has discovered that bacteria isolated from certain populations of amphibians protect hosts from this pathogen. This project focuses on the anti-fungal mechanisms of Serratia marcescens, a species of bacteria isolated from a Costa Rican frog that dramatically inhibited Bd in culture. Wild-type and recombinant S. marcescens was introduced to the microbiomes of a live amphibian host, Acris blanchardi (Blanchard’s Cricket Frog) and then challenged with Bd to examine the protective effects of this bacteria. The experiment includes recombinant S. marcescens with …
Ectomycorrhizal Fungi And Effects Of Soil Microbes Associated With Slash Pine Encroachment Into Native Longleaf Pine Habitat, Madison Brooke Woodruff
Ectomycorrhizal Fungi And Effects Of Soil Microbes Associated With Slash Pine Encroachment Into Native Longleaf Pine Habitat, Madison Brooke Woodruff
Honors Theses
Biological invasions can cause substantial changes to the environment: indigenous species can be reduced or even eliminated, soil characteristics shifted, and nutrient cycles altered. Ectomycorrhizal (ECM) fungi are thought to be key biological controllers of some plant invasions, especially benefiting Pinus species in invasions at exotic sites, but less is understood about the role of ECM fungi and other soil microbes in encroachment by one plant species into the habitat of another in their native ranges. In this study, soil was collected from three habitats in southern Mississippi, USA: native slash pine maritime forest, longleaf pine savanna encroached by slash …
The Trichoplusia Ni Gut Microbiome And Its Derivation From The Phyllosphere Of Its Food Plants, Josemaria Garcia, Marisol Escanuela, Swapna Bhat, Evan Lampert
The Trichoplusia Ni Gut Microbiome And Its Derivation From The Phyllosphere Of Its Food Plants, Josemaria Garcia, Marisol Escanuela, Swapna Bhat, Evan Lampert
Georgia Journal of Science
Insects are the most abundant and diverse animals on planet Earth and rely on their diverse microbiomes to be so. The insect gut microbiome is vital in the growth and development of many insect species. Trichoplusia ni, the cabbage looper, is a generalist herbivore, but little is known about its microbiome. In this study, a metagenomic analysis of fecal samples was used to determine the effect of diet on the microbiome of T. ni larvae. Larvae were reared on six plant species, the microbiome was sampled from fecal material, and the phyllosphere was sampled from leaves the larvae ate. …
Pilot Study Exploring The Effect Of Targeted Cox-2 Inhibition In Macrophages Responding To Neuronal Injury; Promoting Enhanced Axonal Regeneration, Alyssa Brauckmann
Pilot Study Exploring The Effect Of Targeted Cox-2 Inhibition In Macrophages Responding To Neuronal Injury; Promoting Enhanced Axonal Regeneration, Alyssa Brauckmann
Electronic Theses and Dissertations
Celecoxib nanoemulsion (CXB-NE) has been developed as a macrophage targeted analgesics by Dr. Janjic and her team at Duquesne University, (Janjic et al, 2018; Liu et al, 2020; Saleem et al, 2019b; Vasudeva et al, 2014). The CXB-NE nanoemulsion carrying a Nonsteroidal Anti-inflammatory (NSAID) inhibitor of COX-2 activity result in a reduction in PGE2 expression in macrophages. Using CXB-NE in rats that have peripheral nerve injury constricting the sciatic nerve relieves hypersensitivity, a pain-like behavior. The treatment also decreases inflammation associated with this chronic constriction injury (Janjic et al, 2018; Saleem et al, 2019b; Stevens et al, 2019). In this …
Novel Method To Determine Paleodiet Of Extinct Equid Merychippus Sp. Using Dental Calculus, Ranjit Z. S. Virk
Novel Method To Determine Paleodiet Of Extinct Equid Merychippus Sp. Using Dental Calculus, Ranjit Z. S. Virk
Senior Honors Projects, 2020-current
Within the Miocene Epoch, the emergence of grasslands within North America coincided with the incidence of higher-crowned teeth (hypsodonty) within the proto-horse Merychippus that allowed for the inclusion of these expanding grasslands as a food source. As herbivorous paleofauna consume plant matter, microscopic remains become incorporated within dental calculus and, due to their diagnostic morphology, can be used to identify dietary components. In Merychippus, the recovery of plant microfossils holds the potential to provide greater clarity on the paleodiet of these equids. In the present study, the purpose was to quantify and compare Merychippus paleodiet constituents among sample groups. …
A Genomic Analysis Of Bobcat Populations In North America With A Comparison To The Canada Lynx: An Assessment Of Local Adaptation To Unique Ecoregions And Phylogeography, Jennifer C. Broderick
A Genomic Analysis Of Bobcat Populations In North America With A Comparison To The Canada Lynx: An Assessment Of Local Adaptation To Unique Ecoregions And Phylogeography, Jennifer C. Broderick
Electronic Theses and Dissertations
Bobcats (Lynx rufus) are an ecologically and genetically diverse species with a large contiguous range throughout North America. The species not only has a wide array of phenotypic variation compared to other mammals, but shows marked adaptability across ecozones with differing ecological influences. It is these various selective pressures in distinctive parts of the continent that have likely led to localized adaptations within the bobcat metapopulations. The species is also marked by its ability to maintain connectivity and populations in anthropogenically developed areas, an advantage it has over other felids, including its close relative the Canada lynx ( …
Draft Genome Sequence Of Aeromonas Caviae Ufmg-H8, Isolated From Urine From A Healthy Bovine Heifer (Gyr Breed), Silvia Giannattasio-Ferraz, Laura Maskeri, André P. Oliveira, Edel F. Barbosa-Stancioli, Catherine Putonti
Draft Genome Sequence Of Aeromonas Caviae Ufmg-H8, Isolated From Urine From A Healthy Bovine Heifer (Gyr Breed), Silvia Giannattasio-Ferraz, Laura Maskeri, André P. Oliveira, Edel F. Barbosa-Stancioli, Catherine Putonti
Bioinformatics Faculty Publications
Aeromonas caviae is an emerging pathogen in humans, causing intestinal infections. Here, we report Aeromonas caviae strain UFMG-H8, isolated from the urine of a healthy heifer (Gyr breed).
Draft Genome Sequence Of Citrobacter Freundii Ufmg-H9, Isolated From Urine From A Healthy Bovine Heifer (Gyr Breed), Silvia Giannattasio-Ferraz, Laura Maskeri, André P. Oliveira, Edel F. Barbosa-Stancioli, Catherine Putonti
Draft Genome Sequence Of Citrobacter Freundii Ufmg-H9, Isolated From Urine From A Healthy Bovine Heifer (Gyr Breed), Silvia Giannattasio-Ferraz, Laura Maskeri, André P. Oliveira, Edel F. Barbosa-Stancioli, Catherine Putonti
Bioinformatics Faculty Publications
Citrobacter freundii is a pathogen associated with antibiotic resistance and severe infections in humans. Here, we report the draft genome sequence of C. freundii strain UFMG-H9, an isolate from urine from a healthy Gyr heifer.
Presence Of Dirofilaria Immitis In Mosquitoes In Southeastern Georgia, Angelica C. Tumminello
Presence Of Dirofilaria Immitis In Mosquitoes In Southeastern Georgia, Angelica C. Tumminello
Honors College Theses
Canine heartworm disease is caused by the filarial nematode Dirofilaria immitis, which is transmitted by at least 25 known species of mosquito vectors. This study sought to understand which species of mosquitoes are present in Bulloch County, Georgia, and which species are transmitting canine heartworm disease. This study also investigated whether particular canine demographics correlated with a greater risk of heartworm disease. Surveillance of mosquitoes was conducted in known heartworm-positive canine locations using traditional gravid trapping and vacuum sampling. Mosquito samples were frozen until deemed inactive, then identified by species and sex. The mosquitoes were then either dissected under …
Steady Heartbeat: Field And Laboratory Studies Indicate Unexpected Resilience To High Temperatures For The Ribbed Mussel Geukensia Demissa, Ashlyn N. Smith Ms.
Steady Heartbeat: Field And Laboratory Studies Indicate Unexpected Resilience To High Temperatures For The Ribbed Mussel Geukensia Demissa, Ashlyn N. Smith Ms.
Honors College Theses
Salt marshes are important ecosystems found along the coast of Georgia. Salt marshes are hosts to diverse organisms that interact with each other to promote many ecosystem services, such as storm buffering and flooding, and absorption of excess nutrients. Among these diverse organisms is the ribbed mussel, Geukensia demissa. Mussels are a foundation species in this intertidal landscape, and without them the whole salt marsh would be negatively affected. The purpose of this investigation was to explore the thermal stress response of G. demissa to rising temperatures. Mussels were collected from three locations that were landlocked, close to a …
Identifying Fluctuating Asymmetry And Developmental Rate As Indicators Of Developmental Stability In Drosophila Melanogaster, Carrie N. Reaver
Identifying Fluctuating Asymmetry And Developmental Rate As Indicators Of Developmental Stability In Drosophila Melanogaster, Carrie N. Reaver
Longwood Senior Theses
Developmental stability is the ability of an individual to maintain proper development despite various environmental conditions, and thus has important implications for the health of an individual. Individuals with less stable development are thought to be at higher risk for developing non-communicable disease, such as diabetes mellitus and Alzheimer’s disease, during adolescence and adulthood. In bilateral organisms, developmental stability can be assessed by measuring deviations from perfect symmetry between the left and right sides of the body, known as Fluctuating Asymmetry. In this project, we measured the developmental rate and Fluctuating Asymmetry of Drosophila melanogaster while subjected to varying metabolic …
Investigating Reproductive Success And Endocrine Regulation Of Mating Strategies In Male Japanese Medaka, Lauren Closs
Investigating Reproductive Success And Endocrine Regulation Of Mating Strategies In Male Japanese Medaka, Lauren Closs
Departmental Honors & Graduate Capstone Projects
Mate guarding, when two males compete for one female, is a reproductive strategy seen across a variety of vertebrate species. This often leads to hierarchical relationships, in which one male exerts dominance over other, subordinate males. However, the physiological mechanisms that promote dominance or subordinance in males remain largely unexplored. This study investigates the reproductive success and endocrine signals of these reproductive strategies in Japanese medaka (Oryzias latipes). To identify dominant and subordinate males, triads consisting of two males of different genotypes and one female were observed repeatedly for 5 days. Male reproductive success was determined by genotyping …
Bacteremediation: Using Naturally-Occurring Diesel-Degrading Bacteria To Clean Oil Spills, Fernando Cabezas
Bacteremediation: Using Naturally-Occurring Diesel-Degrading Bacteria To Clean Oil Spills, Fernando Cabezas
Departmental Honors & Graduate Capstone Projects
Sand samples from the intertidal zone of beaches surrounding the Norfolk Naval Station were used to isolate 19 diesel-degrading bacteria. The isolation of these bacteria indicates that diesel contamination in Hampton Roads has impacted the bacterial community of its beach sands, and these bacteria could be used as markers of diesel contamination. In addition to these isolates, 3 marine-diesel-degrading bacteria were also isolated from unfiltered, contaminated marine diesel that was being used to test the hydrocarbon-degrading capabilities of the diesel degraders. Only one of the marine diesel degraders, “Salmon”, can directly grow on Bushnell Haas medium with marine diesel as …
Sylvan Dell Nature Preserve Project, Brian Quinn, Katie Wisotsky, Huthaifa Aladwan
Sylvan Dell Nature Preserve Project, Brian Quinn, Katie Wisotsky, Huthaifa Aladwan
Sylvan Dell Field Station Student Projects
The Sylvan Dell Nature Preserve and Farm in South Williamsport, PA. Sylvan Dell is a 229 acre plot of farmland that contains a wetland on the south section of the property. It lies just south of the West Branch of the Susquehanna River. The first humans we know of to settle on this land were the Susquehannock and later the Haudenosaunee (Iroquois) Native Americans. In the late 18th century, white settlers took the land away from the Haudenosaunee. In the 20th century, the famous ornithologist Robert Porter Allen was influenced by the broad range of bird species that would visit …
Effects Of Plant Distribution On The Foraging Behavior Of Pollinators, Evangelina Bahu
Effects Of Plant Distribution On The Foraging Behavior Of Pollinators, Evangelina Bahu
Creative Activity and Research Day - CARD
Understanding floral constancy is a vital tool used to establish foraging behavior among pollinators in urban and natural landscapes. Floral constancy is defined as the tendency of a pollinator to exclusively visit a specific floral species. Pollinators that show higher levels of floral constancy are more likely to transfer conspecific pollen. On the other hand, lower levels of floral constancy are associated with pollinators who transfer heterospecific pollen. We conducted two studies, the first aimed to find the effects of urbanization on plant-pollinator interactions. From our research, we were able to uncover a pattern that showed pollinators to carry a …
Gpr160 De-Orphanization Reveals Critical Roles In Neuropathic Pain In Rodents, Gina L.C. Yosten, Caron M. Harada, Chris Haddock, Luigino Antonio Giancotti, Grant R. Kolar, Ryan Patel, Chun Guo, Zhoumou Chen, Jinsong Zhang, Timothy M. Doyle, Anthony H. Dickenson, Willis K. Samson, Daniela Salvemini
Gpr160 De-Orphanization Reveals Critical Roles In Neuropathic Pain In Rodents, Gina L.C. Yosten, Caron M. Harada, Chris Haddock, Luigino Antonio Giancotti, Grant R. Kolar, Ryan Patel, Chun Guo, Zhoumou Chen, Jinsong Zhang, Timothy M. Doyle, Anthony H. Dickenson, Willis K. Samson, Daniela Salvemini
Biological Sciences Faculty Research & Creative Works
Treating neuropathic pain is challenging and novel non-opioid-based medicines are needed. Using unbiased receptomics, transcriptomic analyses, immunofluorescence, and in situ hybridization, we found that the expression of the orphan GPCR Gpr160 and GPR160 increased in the rodent dorsal horn of the spinal cord following traumatic nerve injury. Genetic and immunopharmacological approaches demonstrated that GPR160 inhibition in the spinal cord prevented and reversed neuropathic pain in male and female rodents without altering normal pain response. GPR160 inhibition in the spinal cord attenuated sensory processing in the thalamus, a key relay in the sensory discriminative pathways of pain. We also identified cocaine- …
Ecological Analyses Of Macroinvertebrates And Fish Species In Six Streams On A Louisiana Military Base From 2001 To 2019, Danielle Joerger
Ecological Analyses Of Macroinvertebrates And Fish Species In Six Streams On A Louisiana Military Base From 2001 To 2019, Danielle Joerger
Biology Theses
An in-depth ecological analysis of how and why the aquatic community changes over time was conducted for 6 streams on the Fort Polk military base in Louisiana using data collected from 2001 to 2019. Fort Polk is a unique location as nineteen first-order streams are located on the premises belonging to three separate drainages. The primary goal was to determine whether temporal or between-drainage variation has a larger effect on community structure. To accomplish this the effects of disturbance on fish and macroinvertebrate assemblages was determined temporally and between drainages. Several hypotheses were drawn from this: 1) temporally, assemblages exhibit …
Gascoyne Demersal Scalefish Resource: Oceanic Pink Snapper Recovery Plan 2018-2037, Department Of Fisheries
Gascoyne Demersal Scalefish Resource: Oceanic Pink Snapper Recovery Plan 2018-2037, Department Of Fisheries
Fisheries Management Papers
No abstract provided.
Draft : Estuarine And Nearshore Finfish Resource Of South-West Western Australia Harvest Strategy : 2020-2025 : Version 2.0, Department Of Fisheries
Draft : Estuarine And Nearshore Finfish Resource Of South-West Western Australia Harvest Strategy : 2020-2025 : Version 2.0, Department Of Fisheries
Fisheries Management Papers
No abstract provided.
Draft : Blue Swimmer Crab Resource Of South-West Western Australia Harvest Strategy : 2020-2025 : Version 2.0, Department Of Fisheries
Draft : Blue Swimmer Crab Resource Of South-West Western Australia Harvest Strategy : 2020-2025 : Version 2.0, Department Of Fisheries
Fisheries Management Papers
No abstract provided.
Ensemble And Consensus Species Distribution Modeling Approaches Applied To Freshwater Fish, Melissa Jean Walsh
Ensemble And Consensus Species Distribution Modeling Approaches Applied To Freshwater Fish, Melissa Jean Walsh
Biology Dissertations - Archive
The field of species distribution modeling has expanded rapidly over the past two decades along with increasing computing capability and the introduction of novel analytical techniques. SDMs relate species occurrence to environmental data and are a valuable tool in helping researchers understand species-environment relationships and make projections about future distributions. Model reliability has been shown to be highly dependent upon a range of factors, including statistical techniques, predictor variables, species prevalence, and choice metrics used to assess model accuracy. SDMs developed from ensembles of different models have been shown to improve reliability. Here I develop an ensemble modelling approach for …
The Response Of Male Bumblebees To A Putative Queen Pheromone, Xavier K. Haemmerle
The Response Of Male Bumblebees To A Putative Queen Pheromone, Xavier K. Haemmerle
Undergraduate Honors Capstone Projects
Queen pheromones are chemical signals produced by the dominant reproductive female in many species of eusocial insects. These pheromones are vital for maintaining a reproductive division of labor. Two evolutionary scenarios may describe the origin of queen pheromones. Sensory exploitation describes a scenario where the pheromone is produced to take advantage of a preexisting sensory bias in a population. An alternative scenario is that the recipient of the pheromone has an adapted response to a preexisting chemical signal. There is a growing body of evidence that cuticular hydrocarbons that act as queen pheromones are co-opted from ancient fertility signals that …
Emergent Seedling Spatial Patterns Following Insect Seed Predation In A Simulated Population, Justin Tirrell
Emergent Seedling Spatial Patterns Following Insect Seed Predation In A Simulated Population, Justin Tirrell
Undergraduate Honors Capstone Projects
Tropical vertebrate species have faced increasing pressures from hunters, causing many to become locally extinct. I used an agent-based model (NEDD) to investigate the influence of dispersal and insect seed predation on seedling survival. Statistical dispersal kernels were used to simulate the dispersal of seeds. The NEDD model generates survival and spatial data from parameter sets, which were chosen based on a Latin-Hypercube experimental design. Spatial point analysis was performed on the output data to identify trends in spatial clustering patterns as the parameter space was changed. The results of this investigation suggest that there is a positive association between …