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.
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Showing 1 to 18 of 18 for “"Metals and metalloids"”.
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Mobilization Mechanisms of Soluble and Dispersible Heavy Metals and Metalloids in Soils
… Schwermetallauswaschungen an kontaminierten Standorten - nicht nur in gelöster sondern auch in kolloidaler Form - ist ein Verständnis der Mobilisierungsmechanismen löslicher sowie dispergierbarer Metallionen unabdingbar. Darüber hinaus sind Kenntnisse über die Zusammensetzung der Kolloide …
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Leaching of metals and metalloids from highway marking glass beads and the potential environmental impact
… effect needed for safe driving. Elevated metal and metalloid concentrations of As, Sb, and Pb have recently been observed in imported glass beads. The main objective of this research was to assess the environmental impact associated with applying these imported glass beads in highway markings. …
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The role of phytotechnology in the rehabilitation of the BHPBilliton Cannington Ag-Pb-Zn mine
… unique biochemical processes of plants to manage and remediate contaminants such as heavy metals, hydrocarbons, radionuclides and pesticides from soil and water. The use of in situ biological systems to rehabilitate large volumes of contaminated soil has enormous potential for application around …
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Bioaccumulation of persistent organic pollutants and trace metals in Scottish marine food webs and their relationship with trophic level and fatty acid signatures.
… marine environment to ensure our seas are clean and safe. One of the biggest threats to our oceans is man-made pollution and it is the responsibility of governments to conduct assessments to advise policy. Across the North-East Atlantic, Contracting Parties to the OSPAR Convention for the …
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Characterization of volcanic ash from 2010 Mt Merapi, Indonesia eruption by neutron activation analysis and leaching analysis
… The research included the use of both thermal and epithermal neutron irradiations from the University of Texas's TRIGA research reactor in conjunction with a high purity germanium detector (HPGe) with a Compton suppression system. The leachate was analyzed by an inductively coupled plasma mass …
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Pore-scale processes : quantification of the controls on the transport of Ra and Cr, and development of a novel geochemical visualization tool
Addressing soil contamination inorganic metals and metalloids remains a critical task for the continuing protection of human health globally. The dissolved concentrations of contaminants are controlled by a wide range of biogeochemical processes including oxidation and reduction by microbes, …
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Adaptation and Protein Quality Control Under Metalloid Stress
Toxic metals and metalloids are emerging as major environmental pollutants, having ecological consequences as well as being linked to a broad range of degenerative conditions in animals, plants and humans. While the toxicity of several metalloids is well established, the underlying molecular …
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Mineralogical Characterization of Uranium Ores, Blends and Resulting Leach Residues from Key Lake Pilot Plant, Saskatchewan, Canada
The production and storage of uranium mine mill tailings have the potential to contaminate local groundwater and surface waters with metals and metalloids. As such, an understanding of the solids reservoirs for potential contaminants in uranium ore blends and leach residues (solid wastes generated …
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Effects of Heavy Metal Pollution on the Loggerhead Sea Turtle
… to determine if the concentrations of heavy metals affected the health of the individuals. More recently, the collection and analysis of blood samples from live turtles has enabled the researcher to investigate the potential health implications of observed metal concentrations. In this …
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Metal and Metalloid Contaminants in Atmospheric Aerosols from Mining Operations
… crushing, grinding, smelting, refining, and tailings management, are a significant source of airborne metal and metalloid contaminants such as As, Pb, Cd and other potentially toxic elements. Dust particles emitted from mining operations can accumulate in surrounding soils, natural waters …
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Volatile metal degassing from volcanoes: source processes, atmospheric transport and deposition
Volcanoes emit metal and metalloid elements in the gas phase at rates that are comparable to industrial emissions of entire countries or regions. These elements (e.g., Cu, Zn, Pb, As, Se), collectively referred to as ‘metal pollutants’ or ‘heavy metals’, can be critical nutrients at low levels, but …
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Characterization of arsenic-binding siderophores from environmental bacteria and evaluation of their role in arsenic tolerance
Arsenic (As) is a toxic metalloid and the remediation of soils and waters from this contaminant as well as the prevention of future contamination are still pending tasks in Chile. There are bacteria able to live in environments polluted with arsenic, as they have tolerance mechanisms for this …
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Assessing the bioavailability of the radionuclides technetium-99, selenium-79 and uranium-238 in contaminated soils using the diffusive gradients in thin-films (DGT) technique
The increasing global inventory of 99Tc, 79Se and 238U as components of nuclear waste, coupled with the legacy of contaminated sites, means that increasing attention has been centred on understanding the environmental behaviour of these radionuclides. Over the last 15 years, the technique of …
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AN INVESTIGATION OF THE FEASIBILITY OF BIOMETHYLATION FOR GROUP IV METALS AND COMPOUNDS
… of environmental methylation of some toxic metals and metalloids has been briefly reviewed. Group IV metals (Sn, Pb) have found widespread industrial use in recent years. Use of lead and organolead chemicals has declined but tin and organotin chemicals production has been increasing. Their …
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Biomonitorización de contaminantes ambientales en parejas madre-hijo y posibles asociaciones con su estado de salud y nutricional en el momento del parto
… 1: “Impact of Pesticide Exposure among Rural and Urban Female Population. An Overview”. Además, se realizó una determinación de los niveles de metales en sangre materna y de cordón, reflejada en el capítulo 2: “Monitoring of metals and metalloids from maternal and cord blood samples in a …
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Caracals as sentinels for metal exposure in a human-transformed landscape
Urbanisation and associated anthropogenic activity release large quantities of metallic elements and metalloids into the environment. Due to their toxicity, environmental persistence and bioaccumulative nature, these chemical pollutants threaten wildlife and human health. As urbanisation increases …
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Regulation of The Heat Shock Response By Thiol-Reactive Compounds In The Yeast Saccharomyces Cerevisiae
<p>Cells govern their activities and modulate their interactions with the environment to achieve homeostasis. The heat shock response (HSR) is one of the most well studied fundamental cellular responses to environmental and physiological challenges, resulting in rapid synthesis of heat shock …
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Advancements in Isotopic Geolocation Tools for Insect Migration Research
… are vital components of global ecosystems and provide important ecosystem services, yet the migration phenomenon is understudied in insects compared to vertebrates. In this thesis, I aim to deepen our understanding of insect migration, using the monarch butterfly Danaus plexippus (L.) and …