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Articles 1 - 25 of 25

Full-Text Articles in Life Sciences

The Effects Of Methylmercury On Corticosterone And Thyroid Hormones In A Breeding Songbird Model Organism, Sarah Ross Lemelin Jan 2011

The Effects Of Methylmercury On Corticosterone And Thyroid Hormones In A Breeding Songbird Model Organism, Sarah Ross Lemelin

Dissertations, Theses, and Masters Projects

No abstract provided.


Behavioral And Mechanical Particle Selectivity In A Suspension-Feeding Detritivorous Fish, Matthew Kyle Heidman Jan 2011

Behavioral And Mechanical Particle Selectivity In A Suspension-Feeding Detritivorous Fish, Matthew Kyle Heidman

Dissertations, Theses, and Masters Projects

No abstract provided.


The Influence Of Golf Course Landscapes On The Occupancy And Reproductive Success Of Eastern Bluebirds, Marie Louise Pitts Jan 2011

The Influence Of Golf Course Landscapes On The Occupancy And Reproductive Success Of Eastern Bluebirds, Marie Louise Pitts

Dissertations, Theses, and Masters Projects

No abstract provided.


An Investigation Of The Polymorphic Arss Gene Of Helicobacter Pylori, Daniel Ross Hallinger Jan 2011

An Investigation Of The Polymorphic Arss Gene Of Helicobacter Pylori, Daniel Ross Hallinger

Dissertations, Theses, and Masters Projects

No abstract provided.


Reactive Sulfur: Redox Reactions Of Cysteines And Methionines In The Cytoskeletal Protein Tubulin, Tara Dawn Hagedorn Jan 2011

Reactive Sulfur: Redox Reactions Of Cysteines And Methionines In The Cytoskeletal Protein Tubulin, Tara Dawn Hagedorn

Dissertations, Theses, and Masters Projects

No abstract provided.


Investigations Of The Fragmentation Spectra Of Dipeptides Containing Lysine And Its Non-Protein Amino Acid Homologs, Omar Hamdy Jan 2011

Investigations Of The Fragmentation Spectra Of Dipeptides Containing Lysine And Its Non-Protein Amino Acid Homologs, Omar Hamdy

Dissertations, Theses, and Masters Projects

No abstract provided.


The Sumo-Targeted Ubiquitin Ligase Subunit Slx5 Functional Interacts With The Sumo E3 Ligase Siz1, Jason William Westerbeck Jan 2011

The Sumo-Targeted Ubiquitin Ligase Subunit Slx5 Functional Interacts With The Sumo E3 Ligase Siz1, Jason William Westerbeck

Dissertations, Theses, and Masters Projects

No abstract provided.


A Tale Of Two Blooms: Dynamics Of Nitrogen Uptake By Harmful Algae In The Eastern Gulf Of Mexico And York River, Virginia, Usa, Lynn M. Killberg-Thoreson Jan 2011

A Tale Of Two Blooms: Dynamics Of Nitrogen Uptake By Harmful Algae In The Eastern Gulf Of Mexico And York River, Virginia, Usa, Lynn M. Killberg-Thoreson

Dissertations, Theses, and Masters Projects

The goal of this study was to determine the significance of dissolved inorganic nitrogen (DIN) and dissolved organic nitrogen (DON) to harmful phytoplankton. Two regions that experience frequent and persistent harmful algal blooms (HABs) were examined, the Eastern Gulf of Mexico and York River, Virginia. Nitrogen uptake by harmful algae in these regions was examined using a combination of stable isotopic (15N) tracer techniques and nutrient bioassays. In the Eastern Gulf of Mexico, kinetic parameters for uptake of N substrates by K. brevis were determined and indicated the greatest preference for ammonium (NH4+), although all substrates tested were taken up ...


Molecular Genetic Studies Of Hematodinium Sp., A Parasitic Dinoflagellate Of The Blue Crab, Callinectes Sapidus, Katrina M. Pagenkopp Lohan Jan 2011

Molecular Genetic Studies Of Hematodinium Sp., A Parasitic Dinoflagellate Of The Blue Crab, Callinectes Sapidus, Katrina M. Pagenkopp Lohan

Dissertations, Theses, and Masters Projects

Economically viable fisheries for the American blue crab, Callinectes sapidus, occur in the USA from Delaware Bay to the Gulf of Mexico. Unfortunately, a number of factors, including overexploitation, degraded habitats, and disease, have contributed to the decline of blue crab populations in the USA. In April 2008, the Secretary of Commerce declared the blue crab fishery in the Chesapeake Bay a "commercial fishery disaster." One factor potentially contributing to the decline of blue crab populations in high salinity waters is infection with Hematodinium sp., a parasitic dinoflagellate, which can cause significant mortalities in blue crab populations. Since the first ...


The Effects Of Seagrass Species And Trophic Interactions In Experimental Seagrass Communities, Althea F. P. Moore Jan 2011

The Effects Of Seagrass Species And Trophic Interactions In Experimental Seagrass Communities, Althea F. P. Moore

Dissertations, Theses, and Masters Projects

No abstract provided.


Deep-Pelagic (0-3000m) Fish Assemblage Structure Over The Mid-Atlantic Ridge In The Area Of The Charlie-Gibbs Fracture Zone, April B. Cook Jan 2011

Deep-Pelagic (0-3000m) Fish Assemblage Structure Over The Mid-Atlantic Ridge In The Area Of The Charlie-Gibbs Fracture Zone, April B. Cook

Dissertations, Theses, and Masters Projects

Only a miniscule fraction of the world’s largest volume of living space, the ocean’s mid-water biome, has ever been sampled. As part of the International Census of Marine Life field project Mid-Atlantic Ridge Ecosystems (MAR-ECO), a discrete-depth trawling survey was conducted in 2009 aboard the NOAA ship Henry B. Bigelow to examine the pelagic faunal assemblage structure and distribution over the Charlie-Gibbs Fracture Zone (CGFZ) of the northern Mid-Atlantic Ridge. This is the first MAR-ECO project aimed specifically at describing diel vertical migration as a distributional phenomenon. Discrete-depth sampling from 0-3000 m was conducted during both day and ...


Genetic Diversity Of The Pathogen Streptococcus Parauberis Isolated From Bovine And Piscine Hosts, Stephen Douglas Cole Jan 2011

Genetic Diversity Of The Pathogen Streptococcus Parauberis Isolated From Bovine And Piscine Hosts, Stephen Douglas Cole

Dissertations, Theses, and Masters Projects

No abstract provided.


Mate-Guarding In The Australian Zebra Finch, Taeniopygia Guttata: For Males, Protecting Paternity Is More Important Than Extra-Pair Copulations, Leah Catherine Wilson Jan 2011

Mate-Guarding In The Australian Zebra Finch, Taeniopygia Guttata: For Males, Protecting Paternity Is More Important Than Extra-Pair Copulations, Leah Catherine Wilson

Dissertations, Theses, and Masters Projects

No abstract provided.


Dynamics And Composition Of The Extracellular Polymeric Substances Produced By Benthic Microalgae: An In Situ 13c And 15n Approach, Stephanie Kara Salisbury Jan 2011

Dynamics And Composition Of The Extracellular Polymeric Substances Produced By Benthic Microalgae: An In Situ 13c And 15n Approach, Stephanie Kara Salisbury

Dissertations, Theses, and Masters Projects

The land-­‐ocean margin is characterized by a shallow water column, which allows light to reach the benthos and supports a diverse community of benthic autotrophs. One group of benthic autotrophs, consisting of benthic diatoms, cyanobacteria and other photosynthetic microorganisms living near the sediment surface (i.e., benthic microalgae) accounts for a substantial amount of this primary production. Benthic microalgae are also tightly coupled to carbon and nutrient cycling processes carried out by the sediment bacterial community. Benthic microalgae exude complex biopolymers, called extracellular polymeric substances (EPS), which consist mainly of carbohydrates, but can contain proteins and nucleic acids. EPS ...


Mercury Exposure Assessment Of South River Floodplain Birds, Jincheng Wang Jan 2011

Mercury Exposure Assessment Of South River Floodplain Birds, Jincheng Wang

Dissertations, Theses, and Masters Projects

The studies involved in this thesis expanded the current project being conducted in Dr. Newman’s laboratory that aimed to define and quantify the impacts of mercury movement in contaminated aquatic and terrestrial food webs in the South River watershed (Virginia, USA). This expansion involved a two phase study, which fulfilled the requirement of a master thesis.

Previous research in our lab documented mercury biomagnification in the river itself and two floodplain locations on the South River watershed. Predictive models were built for mercury concentration in members of these food webs. These studies reached a preliminary conclusion that mercury biomagnification ...


Ecological, Physiological, And Bio-Optical Characteristics Of Phaeocystis Globosa In Coastal Waters Of South Central Vietnam, Xiao Liu Jan 2011

Ecological, Physiological, And Bio-Optical Characteristics Of Phaeocystis Globosa In Coastal Waters Of South Central Vietnam, Xiao Liu

Dissertations, Theses, and Masters Projects

No abstract provided.


Basal Food Web Dynamics In A Natural Eelgrass (Zostera Marina) Community: Cage-Free Field Experimentation, Matthew A. Whalen Jan 2011

Basal Food Web Dynamics In A Natural Eelgrass (Zostera Marina) Community: Cage-Free Field Experimentation, Matthew A. Whalen

Dissertations, Theses, and Masters Projects

The relative strength of bottom-up and top-down processes operating within food webs is a fundamental determinant of community structure and function. In marine systems, inconspicuous but often highly abundant invertebrate herbivores (mesograzers) are implicated as strong consumers of primary production and important prey for higher-order consumers. Because of their small size, however, mesograzer abundance is not easily manipulated in the field, which limits our ability to adequately assess their grazing impacts. Seagrass systems present a pressing need for the study of food web dynamics because anthropogenic nutrient and sediment inputs decrease the amount of light reaching seagrass leaves, which limits ...


Understanding The Origins, Dispersal, And Evolution Of Bonamia Species (Phylum Haplosporidia) Based On Genetic Analyses Of Ribosomal Rna Gene Regions, Kristina M. Hill Jan 2011

Understanding The Origins, Dispersal, And Evolution Of Bonamia Species (Phylum Haplosporidia) Based On Genetic Analyses Of Ribosomal Rna Gene Regions, Kristina M. Hill

Dissertations, Theses, and Masters Projects

No abstract provided.


Molecular Marker Development For The Discrimination Of Atlantic And Pacific Blue Marlin (Makaira Nigricans), Laurie Sorenson Jan 2011

Molecular Marker Development For The Discrimination Of Atlantic And Pacific Blue Marlin (Makaira Nigricans), Laurie Sorenson

Dissertations, Theses, and Masters Projects

No abstract provided.


Net Microbial Activity, Vegetation Dynamics, And Ecosystem Function In Created And Natural Palustrine Forested Wetlands In Southeastern Virginia, Usa, Christian A. Hauser Jan 2011

Net Microbial Activity, Vegetation Dynamics, And Ecosystem Function In Created And Natural Palustrine Forested Wetlands In Southeastern Virginia, Usa, Christian A. Hauser

Dissertations, Theses, and Masters Projects

No abstract provided.


Sumo-Dependent Substrate Targeting Of The Sumo Protease Ulp1, Zachary Cole Elmore Jan 2011

Sumo-Dependent Substrate Targeting Of The Sumo Protease Ulp1, Zachary Cole Elmore

Dissertations, Theses, and Masters Projects

No abstract provided.


Effects Of Dietary Mercury Exposure On Spatial Memory Of Zebra Finches, Taeniopygia Guttata, Amanda Mae Bessler Jan 2011

Effects Of Dietary Mercury Exposure On Spatial Memory Of Zebra Finches, Taeniopygia Guttata, Amanda Mae Bessler

Dissertations, Theses, and Masters Projects

No abstract provided.


Searching For The Seed Plant Ethylene Pathway In A Basal Plant Lineage: A Genomic Approach, Ashley R. Decarme Jan 2011

Searching For The Seed Plant Ethylene Pathway In A Basal Plant Lineage: A Genomic Approach, Ashley R. Decarme

Dissertations, Theses, and Masters Projects

No abstract provided.


The Development And Application Of An Antibody-Based Biosensor For The Detection Of The Petroleum-Derived Compounds, Candace Rae Spier Jan 2011

The Development And Application Of An Antibody-Based Biosensor For The Detection Of The Petroleum-Derived Compounds, Candace Rae Spier

Dissertations, Theses, and Masters Projects

Petroleum is one of the most important natural resources, but can also be problematic to environmental and human health. Petroleum is comprised of thousands of compounds, including polycyclic aromatic hydrocarbons (PAHs) and heterocycles, some of which are toxic and/or carcinogenic. Traditional analytical methods for environmental monitoring of low-level PAHs are time-consuming labor-intensive, and often laboratory-bound. Efforts to achieve timely, sensitive, and accurate analysis of PAHs in the field have become a priority for environmental research and monitoring. Antibody-based biosensors are presently being developed for environmental analysis. Anti-PAH antibody molecules can be coupled with electronic transducers to provide new biosensor ...


The Effects Of Hypoxia On Macrobenthic Production And Function In The Lower Rappahannock River, Chesapeake Bay, Usa, S. Kersey Sturdivant Jan 2011

The Effects Of Hypoxia On Macrobenthic Production And Function In The Lower Rappahannock River, Chesapeake Bay, Usa, S. Kersey Sturdivant

Dissertations, Theses, and Masters Projects

Human development has eroded Chesapeake Bay's health, resulting in an increase in the extent and severity of hypoxia (≤2 mg O2 l-1). The Bay's hypoxic zones have an adverse affect on community function and secondary production of macrobenthos. The production of macrobenthos is important as these fauna link energy transfer from primary consumers to epibenthic predators and demersal fish, and serve as the foremost pathway that carbon is recycled out of the sediment. Additionally, bioturbation, an essential macrobenthic function that causes the displacement and mixing of sediment particles, increases the quality of marine sediments. In the marine environment ...