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 42 for “"Marine waters"”.
-
The Speciation of Dissolved Uranium in Marine Waters
… for quantifying geochemical processes in the marine environment. Due to its low concentration, about 3.3 μg/1, some form of preconcentration is required for analysis. The two most widely used pre-concentration schemes are co-precipitation with iron hydroxide, and chelating ion exchange …
-
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 …
-
DETERMINATION OF CO AND MN IN MARINE WATERS USING FLOW INJECTION WITH CHEMILUMINESCENCE DETECTION
… Chapter One presents an overview of the marine environment and the biogeochemistry of Co and Mn. Current analytical methods for the determination of Co and Mn in natural waters are also reviewed. Chapter Two reports reagent clean-up techniques and the synthesis of an 8- hydroxyquinoline …
-
A Comparative Study of Three Bacterial Source Tracking Methods and the Fate of Fecal Indicator Bacteria in Marine Waters and Sediments
E. coli and Enterococcus were used to determine the fate and survival of fecal indicator bacteria (FIB) in sand and sediments. The microbial source tracking (MST) methods antibiotic resistance analysis (ARA), Bacteroides human-specific primer test, and fluorometry were compared against the FIBs to …
-
Fish and Reptile Remains From the Late Eocene, Crow Creek Local Fauna, St. Francis County, Arkansas
… under hyposaline conditions adjacent to warm marine waters. This is in agreement with earlier studies of associated molluscan remains and sporomorphs found within the region.
-
Ostracodes of the Piney Point formation (middle eocene) of Virginia
… is typical of one inhabiting warm, clear, open marine waters with a slow sedimentation rate and little reworking.
-
RADIOLARIAN BIOSTRATIGRAPHIC AND PALEOCEANOGRAPHIC STUDIES OF MONTEREY-LIKE ROCKS OF THE HUMBOLDT BASIN, NORTHERN CALIFORNIA
… initial deposition was in a basin open to deep marine waters. Through time and in a west to east direction, the radiolarian populations exhibit increasingly shelfal characteristics as shallow water sediments prograded to the west. Total organic carbon data from key chronozones support the models …
-
Seasonal Variation of Mud Floc Sizes in Two Small Freshwater Streams
… part of sediment dynamics within coastal marine waters, but is also a factor of sediment transport within small freshwater streams in Blacksburg, Virginia. The goal of this project was to develop a relationship between floc sizes and stream characteristics (temperature, salinity, …
-
Ecology and taxonomy of free-living marine nematodes from Cienfuegos Bay, Caribbean Sea
… of assemblages and taxonomy of free-living marine nematodes. Most of the data are from Cienfuegos, a semi-enclosed bay in the Caribbean Sea; but, we also provided data on biodiversity from other areas in Cuban marine waters. Four main topics are included: description of biodiversity …
-
ELEMENTAL COMPOSITION AND NUTRIENT EFFECT ON THE UPTAKE AND METABOLISM OF DISSOLVED ORGANIC CARBON BY BACTERIA FROM A TEMPERATE REGION RIVER
… delivered to the coastal ocean. In comparison to marine waters, inland waters quantitatively represent only a fraction of the marine system; however, their importance to global C cycling maybe disproportional to its actual size. Inland systems are subject to multiple sources of OC (autochthonous …
-
Juvenile and subadult Gulf Sturgeon (Acipenser desotoi) use of the Pascagoula River estuary
… Mexico including coastal rivers, estuaries, and marine waters, making annual migrations between freshwater and marine habitats for spawning/summer resting and feeding, respectively. Since past studies prioritize adult movement, understanding how and when juvenile and subadult GS use the …
-
Hydrological and ecological observations along the eastern Beaufort Sea coast of Alaska
… in circulation and connection to adjacent marine waters. We also used stable C and N isotopic analysis to determine trophic structure and assess dependence of fauna on terrestrial (CT) vs. marine sources of carbon, with particular focus on animals widely used by local subsistence hunters. …
-
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, …
-
A multiproxy paleoenvironmental reconstruction of Late Quaternary marine sediments: Sunda Shelf, Southern South China Sea
… 45,000 cal years BP and possibly older) during marine isotope stage (MIS) 3 (ca. 60,000 - 30,000 yrs BP) within the late Pleistocene. Elemental and BMS data agree well within both cores, except Pleistocene sediments exhibit higher BMS (ca. 1x10-4 si) and higher calcium content (ca. 2%) than …
-
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, …
-
The Toxicity of Ammonia to Atlantic Silverside (Menidia menidia) and Ghost Shrimp (Palaemonetes pugio)
… water quality criteria for ammonia in the marine environment have been established to protect aquatic organisms from the toxicity of ammonia. Discharge into Chesapeake Bay has not yet been regulated under this criteria. Ammonia limits of 1-2 mg/L total ammonia have been proposed for the …
-
Late Pleistocene Stratigraphy And Events In The Asbestos-valcourt Region, Southeastern Quebec
… deglaciation of the Quebec City narrows allowed marine waters to invade the isostatically depressed Central St. Lawrence Lowland, thus forming the Champlain Sea about 12 ka.
-
Temporal and Spatial Patterns in Optical Properties of Colored Dissolved Organic Matter on Florida’s Gulf Coast: Shelf to Stream to Aquifer
… Organic Matter (CDOM) in surface and ground waters in South Florida was conducted using fluorescence and absorption spectroscopy. Waters of the West Florida Shelf are heavily influenced by many river systems on Florida's Gulf Coast that, to the first order control CDOM distributions on the …
-
Bacterial biodegradation of soluble crude oil hydrocarbons and the influence of protists in simulated arctic seawater and sea ice
… response options for spills that occur in Arctic marine waters. The influence of protists on bacterial biodegradation of water accommodated fractions (WAF) of petroleum hydrocarbons is unknown, yet important because it could enhance or hinder biodegradation.</p><p>The objectives of this research …
-
Distribution of Free Marine Viruses of Lower Chesapeake Bay and Their Effects on Life-History Parameters of the Estuarine Copepod <i>Acartia tonsa</i> Dana
… are very abundant in fresh, estuarine, and marine waters, with densities on the order of 10<sup>5</sup>-10<sup>8</sup> viruses ml<sup>-1</sup>. Research has focused on virus effects on bacteria, cyanobacteria, and phytoplankton, as well as mechanisms of virus production and decay. However, …
Page 1 of 3