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 43 for “"marine sediment"”.
-
Anode Material Testing for Marine Sediment Microbial Fuel Cells
… fuel cell has increased in the past decade. The sediment microbial fuel cell is a type of fuel cell that uses the environment of submerged sediments to provide a natural voltage difference. The fuel cell is comprised of an anode buried in the sediment and a cathode that is held in the overlying …
-
Expansion of Deltaproteobacteria diversity from marine sediment reveals unique metabolic features
… (MAGs) from a variety of coastal and deep-sea sediments. These 402 Deltaproteobacteria MAGs represent a 28% increase in Deltaproteobacteria genomes. Phylogenomic analyses revealed 12 novel lineages which consist entirely of uncultured representatives. Among these are two lineages that appear to …
-
Remediation of contaminated marine sediment using bentonite, kaolin and sand as capping materials
… is a growing public concern over the issue of sediment contamination resulting from industrial, municipal wastewater, mining activities, and improper use of chemical fertilizer or pesticides. The conventional treatment of contaminated sediment is dredging, but this treatment is expensive and …
-
Analysis of Actinobacterial Biodiversity in Marine Sediment from Gericke's Point (South Africa) and Screening of Isolates for Novel Antimycobacterial Compounds
… using traditional culturebased techniques from sediment taken from marine habitats (a subtidal zone, a rock pool and a beach area) at Gericke's Point (Garden Route National Park, Sedgefield, South Africa). Twenty-seven (27) of the 33 presumptive actinobacterial isolates were identified to the …
-
Supercritical fluid extraction applied to environmental pollutants from Chesapeake Bay sediment
… P AHs were extracted from dry Chesapeake bay marine sediment using two-step experimental conditions where step 1 was designed to extract the more volatile P AHs and used 100% CO2 and step 2 incorporated parameters for the removal and trapping of the less volatile P AHs with 10% acetone …
-
Marine sedimentary organic matter : delineation of marine and terrestrial sources through radiocarbon dating; and the role of organic sulfur in early petroleum generation
… are related to the organic geochemistry of marine sediments, however, this is a fairly encompassing area of study. Chapters 1 and 2 stem from the same experimental study -the use of hydrous-pyrolysis to investigate mechanisms leading to the production of petroleum-related products during …
-
Marine sedimentary organic matter: delineation of marine and terrestrial sources through radiocarbon dating; and the role of organic sulfur in early petroleum generation
… are related to the organic geochemistry of marine sediments, however, this is a fairly encompassing area of study. Chapters 1 and 2 stem from the same experimental study -- the use of hydrous-pyrolysis to investigate mechanisms leading to the production of petroleum-related products during …
-
Marine cycling of neodymium in the South Atlantic and the Southern Oceans
… utilisation of Nd isotopes as a proxy, the marine cycling of Nd is not fully understood. This thesis investigates the cycling of neodymium, together with other rare earth elements, by determining Nd isotopes in the South Atlantic Ocean and the Southern Oceans, which are critical locations in …
-
Remote estimation of aquatic sediment density in the presence of scatter.
… the density of the first few meters of shallow marine sediment. Normal incidence reflections from a 16 kHz omnidirectional source are collected using a single hydrophone directly above the source. An empirical relationship is then used to estimate the sediment density from the normal incidence …
-
The sediment, river plume, and inner shelf variability in a bay with multiple fluvial inputs
Small mountainous rivers deliver considerable sediment loading to the coastal ocean and play a disproportionate role in marine sediment deposition globally. Discharge in these rivers is often driven by short episodic events and they typically deliver sediment to energetic coastal environments where …
-
Diffusion in an absorbing porous medium : from microscopic geometry to macroscopic transport
… microbial extracellular enzyme distributions in marine sediment was an inspiration for this work.
-
A Comparison of Metals in Several Ahermatypic Corals and Surficial Sediments: Mobile Pinnacles and Hoffa Reef, Northcentral Gulf of Mexico
<p>Metal concentrations in marine sediment and carbonate secreting invertebrates are representative of surrounding environmental chemistry. Aluminum, Ba Ca, Cd, Cr, Cu, Fe, Mg, Mn, Ni, Pb, Sr, and Zn were measured in carbonate and terrigenous phases of the $<$63 um fraction of sediment samples from …
-
Late glacial and Holocene marine geology, palaeoceanography and palaeoecology of the Northern Isles of Scotland
Marine palaeoenvironmental data are essential for understanding how the oceans respond to climate and environmental changes. These data can be used to guide climate models and characterise the environment in which human populations develop. During the Holocene, much of the northwestern North Sea …
-
Geochemical tools and paleoclimate clues : multi-molecular and isotropic investigations of tropical marine sediments and alpine ice
… Cariaco Basin (Venezuelan coast) and Peru Margin marine sediment biomarker records. Compounds derived from vascular plant leaf waxes and delivered to the marine sedimentary environment, including long-chain (C24-C32) n-alkanoic acids, were used as proxies for terrestrial vegetation type, aridity, …
-
Late Quaternary climate variability and terrestrial carbon cycling in tropical South America
… of vascular plant biomarkers in lacustrine and marine sediment cores to explore late Quaternary climate variability and connections between past climate change and terrestrial carbon cycling in tropical South America. I investigate temporal and spatial trends in South American Summer Monsoon …
-
Small-scale heterogeneity in sediments : experimental and modelling investigations
… studies relating to small-scale heterogeneity in sediments. The principal aim was to further our understanding of processes occurring at microniches. The individual studies consist of: 1) a critical review of previous studies of microniches that used probes with high spatial resolution and …
-
Distribuição espaço-temporal de Scolelepsis cf. squamata (Muller, 1808) (Polychaeta: Spionidae) como ferramenta para estudos da dinâmica sedimentar costeira
… species distribution. A correlation between sediment size and S. squamata distribution were not found, although a clear relationship between species distribution and marine sediment transport were found. S. squamata densities were lower during high hydrodynamic periods due to their weaker …
-
Late Quaternary climate variability and terrestrial carbon cycling in tropical South America
… of vascular plant biomarkers in lacustrine and marine sediment cores to explore late Quaternary climate variability and connections between past climate change and terrestrial carbon cycling in tropical South America. I investigate temporal and spatial trends in South American Summer Monsoon …
-
Basin Evolution and Slope System Dynamics of the Cretaceous Magallanes Basin, Chilean Patagonia
Deep-marine basins linked to active continental margins by sloped ocean-floor profiles commonlyhost the final accumulation of sediment that was eroded and transported from the continents. Thedeep-marine sediment archives preserved in these settings commonly offer the most completerecord of sediment …
Page 1 of 3