Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 23 for “"Marine water"”.
-
Transformations of mercury in the marine water column
Methylation of mercury (Hg) in the marine water column has been hypothesized to serve as the primary source of the bioaccumulating chemical species monomethylmercury (MMHg) to marine food webs. Despite decades of research describing mercury methylation in anoxic sediments by anaerobic bacteria, …
-
Non-Volatile Dissolved Organic Iodine in Marine Water
<p>An analytical scheme for the determination of marine DOI has been established. The concentration of DOI is estimated as total iodine (TI) minus total inorganic iodine (TII). The concentration of total iodine is determined as [special characters omitted] after DOI has been oxidized to inorganic …
-
Transformations of mercury in the marine water column
Methylation of mercury (Hg) in the marine water column has been hypothesized to serve as the primary source of the bioaccumulating chemical species monomethylmercury (MMHg) to marine food webs. Despite decades of research describing mercury methylation in anoxic sediments by anaerobic bacteria, …
-
Human Norovirus in Artificial and Environmental Marine Water: Development of Antibody Based Rapid Methods
… the virus from contaminated surrounding waters. The consumption of raw or undercooked contaminated oysters may result in acute gastroenteritis. We investigated the occurrence of NoV GI and GII and microbial indicators of fecal contamination in oysters and harvesting water from areas along …
-
Evaluation of the Development and Effectiveness of Copper Total Maximum Daily Loads (Tmdls) to Achieve Marine Water Quality Criteria
… concentrations of certain chemicals in surface water are known to be toxic to aquatic organisms (e.g., barnacles, algae, and fish). For a number of these chemicals (e.g., tributyltin [TBT], copper) federal and state water quality standards exist to protect aquatic organisms. As a means to comply …
-
Determination of Toxic Chemical Contents in the Black Sea Marine Water , Sediment and Biota //// Определяне съдържанието на токсични химични елементи в системата вода-седимент- биота
[EN] Heavy metals in marine systems are a global problem, since continuous exposure of marine organisms to their low concentrations may result in bioaccumulation, and subsequent transfer to man through the food web (Mendil et al, 2005). Heavy metals in the marine environment may originate from …
-
SILICON ISOTOPE AND PETROGRAPHIC INVESTIGATIONS OF SILICIFIED CARBONATE ROCKS: IMPLICATIONS FOR IMPROVED PARAGENETIC SEQUENCING AND PROXIES FOR PALEOZOIC OCEAN CHEMISTRY
… fossils were used to estimate pre-diatom ocean water silicon isotopic compositions, and indicate the need for changes in the model used to calculate dissolved silica δ30Si of pre-diatom oceanic environments of silicification. A correction is proposed to the fractionation factor of sponge …
-
Deposition and diagenesis of a portion of the Frobisher-Alida Interval (Mississippian Madison Group), Wiley Field, North Dakota
… deposited in a low-energy, shallow sublittoral, marine setting. The siliciclastic sandstone-siltstone lithoracies {LF-6) was deposited by eolian processes as a silici clastic-dominated sabkha. </p><p> Facies within the Glenburn bed are stacked vertically rather than prograding either basinward or …
-
Detection of enteroviruses in marine waters using RT-PCR.
… in sewage may find their way into recreational marine waters, causing adverse health effects to exposed individuals. This research project focused on (i) optimization of methods for RT-PCR detection of enteroviruses in marine waters, with particular attention to the issue of sensitivity vs …
-
Methane distribution and oxidation across aquatic interfaces
… that can be spread on vast areas involving marine, freshwater and terrestrial ecosystems. Thus, aquatic systems have a high potential to translate local or regional environmental and subsequently ecosystem changes to a bigger scale. Many studies neglect this connectivity and focus on …
-
Characterizing the Persistence of Sewage Enterococci in Mississippi Coastal Waters
<p>Enterococci are microbiological indicators of marine recreation water quality.<br />Their reliability as fecal indicators is questioned as they are shown to persist in the environment. Multiple laboratory studies on their persistence have been done but few under natural environmental conditions. …
-
Depositional history and diagenesis of the upper Mission Canyon and lower Charles Formations (Mississippian), Billings County, North Dakota
… 1) sublittoral deposition under shallow normal marine conditions; 2) sublittoral deposition in slight topographic depressions under restricted marine conditions of hypersalinity and, possibly, oxygen-deficiency; 3) perilittoral and littoral deposition on a basinward (northwestward) prograding …
-
Revisiting Beachrock Cementation Processes
… found in all studied sites precipitate from seawater in marine vadose (landward) to marine phreatic (seaward) systems. Recrystallization of cements, at depth, was observed in one locality (Hatillo). The 18O of cements at the surface indicate that seawater has undergone evaporation although …
-
Return to the realm of the Kob Kings: social capital, learning, resilience and action research in a changing fishery
… each focussing on a different challenge: marine water temperatures; school learning for social learning; fishers’ organisations; and branding of linefish. The objectives of the thesis are to explore the processes, constraints, motivators, and lessons learnt in addressing each of the four …
-
Molecular studies of the sources and significance of archaeal lipids in the oceans
Marine archaea are ubiquitous and abundant in the modem oceans and have a geologic record extending >100 million years. However, factors influencing the populations of the major clades - chemolithoautotrophic Marine Group I Thaumarchaeota (MG-I) and heterotrophic Marine Group II Euryarchaeota …
-
Depositional Facies and Petrophysical Characterization of the Leonardian Carbonate (Lower Clear Fork), Tex-Mex, S.E. Field, Central Basin Platform, West Texas
… platform carbonates deposited in shallow marine water during the Early Permian. The sediment of the Lower Clear Fork is composed of a mixed succession of dolomite interbedded with anhydrite, minor clay minerals, and siliciclastics. The high heterolithic nature of the reservoir makes …
-
Milankovitch-driven cyclicity and climate controlled dolomitization of a Late Triassic carbonate platform, Hungary
… Mn²⁺ rich and slightly enriched in δ¹⁸O compared marine calcite cement, and formed from weakly to moderately reducing marine waters. Subtidal dolomites are slightly coarser grained, low in Fe²⁺ and Mn²⁺ and have heaviest d¹⁸O signatures, indicating more evaporative oxidizing brines beneath flats. …
-
Laboratory Experiments on Mud Flocculation Dynamics in the Fluvial and Estuarine Environments
… unflocculated. Yet mud flocs exist in freshwater systems long before the estuarine zone, likely due to the presence of OM and ions in the water that facilitate binding and aggregation of mud particles. This research aimed to examine the flocculation state of mud over the fluvial as well as …
-
Mineral, fluid and thermal evolution in veins from late orogenic coal basins of the Cantabrian Zone (Variscan, NW Spain)
… advection of large volumes of gas (CH4 -CO2) and water formed in response to progressive maturation of the coal. Stage 2 also occurred under burial conditions, with lower temperature diagenetic dissolution-precipitation reactions controlling mineral growth. Brittle reactivation of veins caused …
-
Predator-prey dynamics under the influence of exogenous and endogenous regulation : a data-based modeling study on spring plankton with respect to climate change
… in a deep lake (Lake Constance) and a shallow marine water (mesocosms from Kiel Bight), using descriptive statistics, multiple regression models, and process-oriented dynamic simulation models. The development of the spring phytoplankton bloom, representing a dominant feature in the plankton …
Page 1 of 2