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 19 of 19 for “"metal transport"”.
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Metal transport in the Aberjona river system : monitoring, modeling, and mechanisms
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1995.
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Nano- to catchment-scale investigations of metal transport processes in mining-impacted river systems
Millennia of metal mining has left across the world an extensive physical legacy of contaminated mine waste and a substantial impact on the environment. In mining-impacted rivers, efforts to monitor metal mine contamination and remediation strategies to achieve good water quality are often of …
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Characterisation of putative metal transport proteins in the nickel hyperaccumulator Senecio coronatus: investigating candidate genes for nickel tolerance and accumulation
… of exceptionally high concentrations of heavy metals in plant tissues is an extreme phenotypic trait that has evolved independently in multiple plant taxa. The majority of research undertaken in this area has been performed on zinc/cadmium hyperaccumulators and comparatively little is known …
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A hydrogeochemical investigation of metalliferous coal pile runoff and its interaction with soil and groundwater
Highly acidic and metal-rich runoff from coal storage facilities can have a dramatic impact on local surface and ground water quality. In order to identify important reactions governing metal transport within subsurface environments subject to infiltration of coal pile runoff, samples of …
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Surface Sorption Properties of Halophilic Archaea
Identifying and quantifying the controls on metal mobilities in geologic systems is critical in order to understand processes such as global elemental cycling, metal transport in near-surface water-rock systems, sedimentary diagenesis, and soil formation. Archaea are ubiquitous in near-surface …
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Chemical heterogeneity of glaciofluvial deposits: Outcrop study and implications for reactive transport
… systems and their influence on contaminant transport are poorly understood. Consequently, an outcrop study was conducted in a glaciofluvial deposit in Deerfield, New Hampshire in order to: (1) identify the sediment properties controlling heavy metal adsorption, (2) evaluate the extent to …
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CHARACTERIZATION OF TWO METAL TRANSPORTERS HMA3 AND NRAMP1 IN TWO ECOTYPES OF THE ZN/CD HYPERACCUMULATOR THLASPI CAERULESCENS COMPARED WITH ARABIDOPSIS THALIANA
Accumulation of a given metal in plants depends on a delicate and precise balance of various biological processes. Some plants have developed strategies that allow them to tolerate heavy metals in extreme conditions without suffering toxicity. This research focuses on the characterization of two …
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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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The Smallest Base and Precious Metal Deposits in the World: Vapor Transport and deposition of Co-Cu-Sn-Ag alloys in vesicles
<p>Metallic bronze-Co-Ag alloys ranging from1-90 µm have been discovered in bomb and lava vesicles from the mafic volcanoes of Kilauea in Hawaii and Vesuvius, Stromboli and Etna in Italy. It is inferred that the metals for these alloys were transported (in part) as chloride complexes, and that the …
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Arsenic transport in groundwater, surface water, and the hyporheic zone of a mine-influenced stream-aquifer system
We investigated the transport of dissolved arsenic in groundwater, surface water and the hyporheic zone in a stream-aquifer system influenced by an abandoned arsenopyrite mine. Mine tailing piles consisting of a host of arsenic-bearing minerals including arsenopyrite and scorodite remain adjacent …
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Separation of alkali metal cations and alkaline earth cations using ionizable crown ethers
… ethers are novel agents for the separation of metal ions by extraction and membrane transport processes. A series of novel crown ether carboxylic acids , crown ether phosphonic acid monoesters, and crown ether phosphonic acids which possess lipophilic pendant groups were employed for the study …
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Evolution of Pseudomonas aeruginosa in the Cystic Fibrosis Lung
… in transcriptional regulation, amino acid transport and metabolism, cell wall and membrane modifications, metal transport and metabolism, toxin production and defense as well as general carbohydrate and cell-signaling pathway. Interestingly, these categories are also represented by 31 …
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Evolution of Pseudomonas aeruginosa in the Cystic Fibrosis Lung
… in transcriptional regulation, amino acid transport and metabolism, cell wall and membrane modifications, metal transport and metabolism, toxin production and defense as well as general carbohydrate and cell-signaling pathway. Interestingly, these categories are also represented by 31 …
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XAS studies of metal speciation in hydrothermal fluids
Knowledge of metal speciation and thermodynamic properties underpins our capability to model metal transport and deposition in natural and engineered systems. Using synchrotronbased X-ray Absorption Spectroscopy and high temperature – high pressure experimental techniques, this project aims to …
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Funktionelle Charakterisierung der Ionentransportproteine CorA, NccB und CzcA von Helicobacter pylori
… an das Habitat Magen ist die bakterielle Metall-ionenhomöostase von grundlegender Bedeutung und stellt damit einen Angriffspunkt für die Entwicklung alternativer Therapeutika dar. Im Rahmen der vorliegenden Arbeit wurden die Funktionen des Magnesiumtransporters CorA, sowie der putativen …
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Emerging stable isotope techniques in hydrothermal research: new methods applied to carbonates and hydrous minerals in ore deposits and geothermal fields
… mineral isotope tools in epithermal precious metal deposits A novel approach to measure δ2H and δ18O in hydrous minerals is presented in Chapters 3-4. Measurement was carried out on phyllosilicates, hydrous sulphates, and multimineralic whole rock assay pulps using a custom-built thermal …
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Untersuchungsergebnisse zur Mobilität und Remobilisierung von Kupfer und Antimon in wasserwirtschaftlich relevanten, porösen Lockergesteinen durch Säulenversuche und mit reaktiver Transportmodellierung
… and geochemical contexts of the heavy metal transport in watersaturated porous aquifer sediments, where both copper (Cu) and antimony (Sb) are the main focus. The background of investigation is based on questions within the scope of the redevelopement of past industrial waste deposits …
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Thermodynamic Investigations of Metalloproteins: Metal as Probe and Protein as Probe
<p>In this dissertation several metalloproteins, both metal transport proteins and the classic metalloprotein hemoglobin, are investigated using a variety of biophysical and electrochemical techniques. In each case, thermodynamic measurements provide insight into the role and mode of action of the …
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A metallomic, proteomic and lipidomic investigation of the malaria parasites digestive vacuole and insights into the mediators of haemozoin formation
… focused on exploring the Plasmodium falciparum metallome and investigated the mediators of haemozoin formation, an ingenious parasite-specific process critical to host immune evasion as well as parasite survival and one that is surprisingly rather contentious. In order to obtain a comprehensive …