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Articles 1 - 21 of 21
Full-Text Articles in Physical Sciences and Mathematics
Composition And Bioavailability Of Effluent Dissolved Organic Nitrogen, Quinn Nicole Roberts
Composition And Bioavailability Of Effluent Dissolved Organic Nitrogen, Quinn Nicole Roberts
Dissertations, Theses, and Masters Projects
Cultural eutrophication, the overproduction of phytoplankton biomass in response to increased nutrient inputs directly associated with human activities, is a major threat to the health of Chesapeake Bay. Strict regulations, which require a reduction in nutrient loading from all sources, have been a key component to restoration efforts. Water reclamation facilities (WRFs), which discharge effluent containing nitrogen (N) and other nutrients into receiving waters, have implemented upgrades in an effort to comply with regulations. These improvements have decreased the concentration of highly labile dissolved inorganic N (DIN), leaving behind significant concentrations of dissolved organic N (DON) whose bioavailability, and therefore …
An Evaluation Of Norovirus Persistence In Estuarine Water And Of Methods For Its Detection In Treated Sewage Effluent, Margaret H. Fagan
An Evaluation Of Norovirus Persistence In Estuarine Water And Of Methods For Its Detection In Treated Sewage Effluent, Margaret H. Fagan
Dissertations, Theses, and Masters Projects
No abstract provided.
The Infection Dynamics Of Pav1 In The Caribbean Spiny Lobster Panulirus Argus, Caiwen Li
The Infection Dynamics Of Pav1 In The Caribbean Spiny Lobster Panulirus Argus, Caiwen Li
Dissertations, Theses, and Masters Projects
Panulirus argus Virus 1 (PaV1) is an emerging disease in Caribbean spiny lobster Panulirus argus. It is considered a threat to the lobster industry in the Florida Keys. In order to understand the infection dynamics of the PaV1 virus in the lobster host, a sensitive and specific fluorescence in situ hybridization (FISH) assay was developed for diagnosis of PaV1 in lobsters. The lower limit of detection using the 110-bp DNA probe in a dot-blot hybridization for PaV1 was 10 pg of cloned DNA template and 10 ng of genomic DNA extracted from hemolymph of diseased spiny lobster. The probe specifically …
The Role Of Bacteria-Particle Interactions In Marine Snow Dynamics, Emily M. Yam
The Role Of Bacteria-Particle Interactions In Marine Snow Dynamics, Emily M. Yam
Dissertations, Theses, and Masters Projects
Marine snow aggregates are one of the primary vehicles for deep-sea carbon sequestration. Bacterial activity on marine snow affects both degradation and aggregation processes that determine the flux of carbon to depth, biogeochemical cycling, and microbial food webs. The microscale processes occurring on aggregates depend on specific interactions between bacteria and particles. In this thesis, I describe two such interactions which have larger scale implications on marine snow dynamics: (1) the effects of starvation on bacterial motility and colonization behaviors on marine aggregates and (2) interactions between bacteria and phytoplankton which could contribute to the production of TEP.
Current models …
Iron And Carbon Limitation Of Prokaryotic Growth In The Ocean, Jacques L. Oliver
Iron And Carbon Limitation Of Prokaryotic Growth In The Ocean, Jacques L. Oliver
Dissertations, Theses, and Masters Projects
Studies were undertaken to examine the roles of iron and carbon in modulating prokaryotic growth in the ocean. The context of the first study was an open-open iron fertilization experiment in the high nutrient, low chlorophyll (HNLC) regime in the Southern Ocean. The context of the second study was the oligotrophic, iron-replete, and organic carbon-limited northwest Sargasso Sea. Experimental sea water cultures were amended with an iron chelator, desferrioxamine B (DFOB), and other nutrients to examine the effects of iron and carbon limitation on growth. In the first study prokaryotic abundance, carbon production, and growth rate increased in response to …
Pathobiology Of Mycobacteria In Striped Bass (Morone Saxatilis), David T. Gauthier
Pathobiology Of Mycobacteria In Striped Bass (Morone Saxatilis), David T. Gauthier
Dissertations, Theses, and Masters Projects
Striped bass (Morone saxatilis) in Chesapeake Bay, USA, are experiencing an epizootic of mycobacteriosis. This disease, caused by bacteria in the genus Mycobacterium, causes granulomatous lesions of the skin and viscera. Diseased fish are often emaciated, and fish with skin lesions may be significantly disfigured. The overall goal of this work was to examine aspects of the pathobiology of mycobacteria in striped bass via laboratory exposure studies and cellular assays. Striped bass were injected intraperitoneally with a sublethal dose of Mycobacterium marinum, M. shottsii, or M. gordonae and sampled for histology and bacteriology at regular intervals to 45 weeks post-injection …
Microbial Dynamics And Biogeochemistry In The North Pacific Subtropical Gyre, Matthew J. Church
Microbial Dynamics And Biogeochemistry In The North Pacific Subtropical Gyre, Matthew J. Church
Dissertations, Theses, and Masters Projects
The research presented in this dissertation describes the influence of planktonic bacterial growth on upper ocean organic matter dynamics in the North Pacific Subtropical Gyre (NPSG). Examination of the temporal dynamics in dissolved organic matter (DOM) was coupled with investigations that targeted the influence of heterotrophic bacterial production (HBP) on organic matter fluxes in the NPSG. Nine cruises to the Hawaii Ocean Time-series field site Station ALOHA revealed that HBP accounted for a large flux of organic carbon in the upper ocean of the NPSG. HBP was significantly enhanced by sunlight, with photoenhancement of HBP accounting for 3.2 mol C …
Bacterial Properties And Dissolved Organic Matter Distributions In The Black Sea, Jessica A. Morgan
Bacterial Properties And Dissolved Organic Matter Distributions In The Black Sea, Jessica A. Morgan
Dissertations, Theses, and Masters Projects
No abstract provided.
Molecular Characterization Of Cultured Perkinsus Marinus Isolates, Gwynne D. Brown
Molecular Characterization Of Cultured Perkinsus Marinus Isolates, Gwynne D. Brown
Dissertations, Theses, and Masters Projects
Perkinsus marinus is the causative agent of the oyster disease Dermo in the eastern oyster, Crassostrea virginica. In vitro propagation of the parasite has led to the establishment of multiple isolates by several investigators. Little work, however, has been done to characterize different isolates. In this study multiple isolates were examined for genetic and biochemical diversity. at two loci, the ITS region and the ATAN region, there was as much intra-isolate genetic variation among DNA sequences of some isolates as there was inter-isolate variation. Variation was also observed at a third loci, a subtilisin-like serine protease gene. This is the …
Characterization Of Iron-Bearing Solids Used By Naturally-Occurring Microbes In The Anaerobic Degradation Of Hydrocarbons, David C. Powell
Characterization Of Iron-Bearing Solids Used By Naturally-Occurring Microbes In The Anaerobic Degradation Of Hydrocarbons, David C. Powell
Dissertations, Theses, and Masters Projects
No abstract provided.
Carbon Production And Growth Physiology Of Heterotrophic Bacteria In A Subtropical Coral Reef Ecosystem, Peter Dylan Countway
Carbon Production And Growth Physiology Of Heterotrophic Bacteria In A Subtropical Coral Reef Ecosystem, Peter Dylan Countway
Dissertations, Theses, and Masters Projects
No abstract provided.
Limitation Of Bacterial Growth By Dissolved Organic Matter And Iron In The Southern Ocean, Matthew J. Church
Limitation Of Bacterial Growth By Dissolved Organic Matter And Iron In The Southern Ocean, Matthew J. Church
Dissertations, Theses, and Masters Projects
No abstract provided.
Effects Of Simulated Sediment Resuspension Events On The Abundance Of Water Column Bacteria Of Tomales Bay, California, Christopher J. Collumb
Effects Of Simulated Sediment Resuspension Events On The Abundance Of Water Column Bacteria Of Tomales Bay, California, Christopher J. Collumb
Dissertations, Theses, and Masters Projects
No abstract provided.
Effects Of Sunlight And Seasonal Temperature On Persistence Of Four Bacteriophages In An Estuarine Environment, Terri A. Muller
Effects Of Sunlight And Seasonal Temperature On Persistence Of Four Bacteriophages In An Estuarine Environment, Terri A. Muller
Dissertations, Theses, and Masters Projects
No abstract provided.
Frna Coliphages As A Viral Indicator Of Sewage Pollution In An Estuary, David Miller Boyd
Frna Coliphages As A Viral Indicator Of Sewage Pollution In An Estuary, David Miller Boyd
Dissertations, Theses, and Masters Projects
No abstract provided.
Growth Rate And Grazing Dynamics Of Coccoid Cyanobacteria In The Lower Chesapeake Bay, Carol J. Falkenhayn
Growth Rate And Grazing Dynamics Of Coccoid Cyanobacteria In The Lower Chesapeake Bay, Carol J. Falkenhayn
Dissertations, Theses, and Masters Projects
No abstract provided.
Effects Of Selected Nitrogen-Containing Aromatic Compounds (Ncacs) On Physiological Properties In Escherichia Coli, W. James Catallo Iii
Effects Of Selected Nitrogen-Containing Aromatic Compounds (Ncacs) On Physiological Properties In Escherichia Coli, W. James Catallo Iii
Dissertations, Theses, and Masters Projects
This research examined the effects of quinoline and 4-azafluorene on respiratory electron transport rate (ET), outer membrane permeability and topology, oxygen consumption, and viable cell density in Escherichia coli cell suspensions. ET was estimated spectrophotometrically using INT (2-(p-iodophenyl)-3-(p-nitrophenyl)-5-(phenyl)-2H-tetrazolium chloride, which is reduced in vivo to a red colored formazan (INTF). Both test compounds caused anomalous dose-response behavior in INT assays: in a defined window of doses, ET rates near or above the controls were observed. These doses showed altered INT reduction kinetics, decreased cellular oxygen demand, and decreased viable cell densities. Experiments with E. coli spheroplast preparations, gram(+) cells, and …
Nanoplankton Dynamics In A Salt Marsh-Mudflat Ecosystem, Helena Maria Galvaeo
Nanoplankton Dynamics In A Salt Marsh-Mudflat Ecosystem, Helena Maria Galvaeo
Dissertations, Theses, and Masters Projects
No abstract provided.
Seasonal Changes In The Growth And Structure Of The Diatom Asterionella Formosa Hassall In Lake Matoaka, Virginia, Kathy Joyce Lundgren
Seasonal Changes In The Growth And Structure Of The Diatom Asterionella Formosa Hassall In Lake Matoaka, Virginia, Kathy Joyce Lundgren
Dissertations, Theses, and Masters Projects
No abstract provided.
Chitinoclastic Bacteria From The Mid-Atlantic Shelf: Distribution, Taxonomy, And Effect Of Oil On Growth And Chitin Degradation, Darbie Anne Lister
Chitinoclastic Bacteria From The Mid-Atlantic Shelf: Distribution, Taxonomy, And Effect Of Oil On Growth And Chitin Degradation, Darbie Anne Lister
Dissertations, Theses, and Masters Projects
No abstract provided.
Bacterial Response To Crude Oil Spillage In A Salt Marsh, Russell Paul Herwig
Bacterial Response To Crude Oil Spillage In A Salt Marsh, Russell Paul Herwig
Dissertations, Theses, and Masters Projects
No abstract provided.