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 20 of 32 for “"Metalloid"”.
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Metalloid aluminum clusters with fluorine
… is recent interest in using molecular-scale metalloid clusters as a way to achieve very rapid rates of metal combustion. These clusters contain a mixture of low-valence metals as well as organic ligands. Here we investigate a prototypical aluminum metalloid cluster to determine system …
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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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Sequestration of metal and metalloid ions by thermophilic bacteria
… investigating the interaction between metal and metalloid ions and thermophilic bacteria, and 2) characterizing microbial populations in a geothermally active habitat with relatively high concentrations of metalloid ions and compounds. In initial cadmium ion toxicity assays, the minimal …
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Metal and Metalloid Contaminants in Atmospheric Aerosols from Mining Operations
… 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 and vegetation at relatively high concentrations through wind and water …
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Evaluation of Heavy Metals and Metalloid Accumulation in a Small-Scale Aquaponic System and an Effect on Bacterial Antibiotic Resistance
… and accumulation of artificially elevated toxic metalloids and heavy metals (HMs) (arsenic (As), cadmium (Cd), mercury (Hg), and lead (Pb)) after inoculating them into aquaponics water at levels of 20%, 15%, 1.0%, and 1.0%, respectively, of the U.S Environmental Protection Agency (U.S EPA) …
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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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Geochemical tracers of processes affecting the formation of seafloor hydrothermal fluids and deposits in the Manus back-arc basin
… (rare earth element (REE), heavy metal, metalloid concentrations) of seafloor vent fluids and related deposits from hydrothermal systems in the Manus back–arc basin (Eastern Manus Basin, EMB and Manus Spreading Center, MSC) are used to investigate processes that affect their formation. …
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Leaching of metals and metalloids from highway marking glass beads and the potential environmental impact
… 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. To …
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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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Geochemical tracers of processes affecting the formation of seafloor hydrothermal fluids and deposits in the Manus back-arc basin
… (rare earth element (REE), heavy metal, metalloid concentrations) of seafloor vent fluids and related deposits from hydrothermal systems in the Manus back-arc basin (Eastern Manus Basin, EMB and Manus Spreading Center, MSC) are used to investigate processes that affect their formation. …
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Characterization Of Arsd: An Arsenic Chaperone For The Arsab As(iii)-Translocating Atpase
<p>Arsenic is a metalloid toxicant that is widely distributed throughout the earth's crust and causes a variety of health and environment problems. As an adaptation to arsenic-contaminated environments, organisms have developed resistance systems. In bacteria and archaea various ars operons encode …
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Technical and economic feasibility of a high-temperature self-assembling battery
… densities. Another key feature is that a molten metalloid acts as the positive electrode, while an alkali or alkaline earth metal acts as the negative electrode, providing two electronically conductive molten electrodes. The cell is estimated to have a lifespan of 10-15 years with >3,000 …
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Genetic relatedness of the family Rhodospirillaceae: Genome plasticity, chromosome heterogeneity, and chalcogenic oxyanion reductase activity in Rhodobacter sphaeroides
… and $\rm Rh\sb2O\sb3),$ occurred via a metalloid oxyanion reductase (MORase), and resulted in elemental deposition in the cytoplasmic membrane, and concomitant H$\sb2$ evolution during photoheterotrophic growth in the presence of these oxyanions. Based on the analysis of TnphoA-derived …
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Molecular machines constructed from multichromophore arrays
… emphasis on the introduction of central metal/metalloid elements such as ruthenium, indium and lanthanides. The linking of porphyrins to give covalent assemblies suitable for elaboration into machine-like arrays is then described. The synthesis of an array in which four porphyrin units surround …
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Magnetic Properties Of Sputter Deposited Fe-based Amorphous Thin Films For Resonator Application
… of the annealing process. For the same metalloid concentration, the induced anisotropy has a maximum as a function of Ni. For the same nickel concentration and annealing time, it was found that the value of Hk decreases with the increase in annealing temperature. For each composition …
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Characterization of the Molecular Mechanisms of Xenobiotic-Induced NRF2 Activation for Disease Prevention and Intervention
… to solar ultraviolet (UV) radiation or the metalloid arsenic, that cause toxicity and cancer. In the first part of this dissertation, the achiote-derived apocarotenoid bixin was characterized as a novel NRF2 activator. Bixin pre-treatment prevented solar UV-induced photodamage and hair …
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The Impact of Metals and Metal Mixtures on Cardiometabolic Health among Hispanics/Latinos
… data and literature indicate that metal and metalloid exposures may increase the risk for cardiometabolic disease and cardiometabolic disease-related traits. Furthermore, many studies have identified that Hispanics/Latinos have higher exposure burdens to environmental contaminants including …
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Progress toward a cloneable bismuth nanoparticle
… reducing enzyme, Glutathione Reductase-Like Metalloid Reductase (GRLMR), which reduces selenite to form zero valance selenium. This chapter concludes by outlining the advantages of using bismuth as a contrasting marker. The second chapter discusses the background of arsenate reductase (ArsC) …
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The role of colloidal phase in the measurement of pollutants in natural waters
… The labels used to date have included the toxic metalloid arsenic and the fluorescent compound Rhodamine B, which had also been used to improve sensitivity. The behaviour of engineered labelled colloidal sols has been investigated during the preliminary filtration study in the laboratory. …
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