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 28 for “"metal uptake"”.
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Oxidation of Microplastics: Evidenced by Spectroscopy, Hydrophilicity, and Heavy Metal Uptake
… an adsorption/desorption protocol with the heavy metal lead (Pb). The ICP-OES was used to quantify the adsorption/desorption of lead on the weathered microplastics. Polyethylene microbeads weathered via chemical weathering successfully adsorbed and desorbed the heavy metal lead, and the irradiated …
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A Meta-Analysis and Risk Assessment of Heavy Metal Uptake in Common Garden Vegetables.
… searched to identify research pertaining to the uptake of heavy metals (As, Cd, Pb and Zn) by vegetables (cabbage, carrot, lettuce, and radish). The objectives of this research were to 1) determine the relationship between heavy metal concentrations in the soil and heavy metal concentrations in …
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Bioaccumulation of trace metals in biota (algae and chironomids) from Kenyan saline lakes (Bogoria and Nakuru): evaluation and verification of two compartment toxicokinetic models
… some Kenyan Saline lakes as biomonitors of trace metals. The use of compartment models as predictive tools in assessment environmental quality was also evaluated. The test organisms (Algae Arthrospira fusiformis and chironomids Lepotochironomous deribae) exhibited organism dependent and element …
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Temporal patterns of metal ion and nanoparticle uptake by Lolium perenne in hydroponic systems in the presence of amendments ethylene diamine disuccinic acid (EDDS) and gibberellic acid
Contamination of the environment by metal ions poses a threat to human and ecosystem health. In the past few years, concern has shifted to metal oxide nanoparticles due to the rapid rise in nanomaterial usage, resulting in their release into the environment. Despite an abundance of literature on …
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Effect of Microbial Exopolysaccharides in Soil on Metal Availability to Plants (Copper, Cadmium, Binding)
… As such, they are potential binding sites for metallic cations--some that are necessary for plant nutrition, and others that are pollutant metals of anthropogenic origin. This research sought the answers to three questions: (1) What is the affinity and capacity of exopolysaccharides for bound …
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Plant-Soil Feedbacks In Heavy Metal Soils
Heavy metal pollution is a major environmental problem. Metal pollutants are long lasting and can be toxic to organisms in all parts of an ecosystem, including humans. Restoring healthy ecosystems in metal contaminated sites is critical for human and environmental health. Plant-soil feedbacks …
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Heavy metal distribution in Wrigley Head, Moston Brook, Greater Manchester,Northwest England : implications for risk assessment and remediation
Heavy metal contaminated sites pose potential environmental and health problems and represent a great barrier to the beneficial use of contaminated sites. Therefore, the study of heavy metal contamination is a vital knowledge gap which, when filled, will facilitate development of sound management …
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Approaches to study Zn(II) deficiency and transport in biology
… zinc, Zn(II), is an abundant and essential metal ion for human health. Across diverse biological settings, it stabilizes the structure of proteins, serves as a catalytic cofactor in enzymes with disparate functions, and mediates important signaling events. The ability of cells to apply …
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Study of Metal Tolerance / Accumulation in <em>Festuca arundinacea</em> Schreb. From a Serpentine Site in North Carolina
<p>The prevailing conditions in metalliferous soils are usually hostile for plant growth, but some plant species are still able to thrive in these substrates. <em>Festuca arundinacea</em> Schreb. plants were found to thrive on serpentine soils containing high concentrations of Cr and Ni. These …
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Empirical investigation of water pollution control through use of Phragmites australis
… of water pollution caused by heavy and toxic metals Cd, Cr, Cu and Pb. The thesis proposes the use of the technique of phytoremediation using Phragmites australis (PA) plants that have the capacity to absorb and to accumulate such metals in their roots and leaves. The metal uptake and their …
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Sources of variability in trace metal bioaccumulation by fish
… and channel catfish were collected in 1982 from metal-contaminated Peak Creek, Virginia. Whole-body and tissue concentrations of cadmium, lead, and zinc were determined by atomic absorption spectrophotometry. Variations in metal concentrations within each species were related to duration of …
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Electrokinetic-assisted phytoremediation of heavy metal in riverbank soil
… in enhancing the ability of plant heavy metal uptake in soils. This study was conducted to investigate the difference in heavy metal composition concentration of riverbank soil and the change of soil pH between pre and post phytoremediation and EK assisted phytoremediation treatment. The …
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Dealing with contaminated land in the ‘New Regime’: an appraisal of the use of plants as biomonitors for metal contamination analysis and risk assessment for a former landfill site in Greenwich
In assessing the health risks posed from heavy metals in a contaminated site, it is important to determine when the contamination occurred and when the metals become available to the surrounding biota. Trees and plants growing in the vicinity of a contaminated site may provide such a historic …
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Describing the Cell Biology of Saprolegnia parasitica: Role of Metals and Respiration
… how S. parasitica responds to fluctuations in metal availability at the physiological and mitochondrial levels. This study investigates the impact of copper and iron availability on Saprolegnia parasitica growth, metal uptake, and respiratory function. We cultured S. parasitica in chemically …
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Factors affecting the growth of Cladophora in relation to river pollution
… by 0.036 mgCu/l, 0.070 mgzn/1 and 1.03 mgPb/l. Metal uptake was evaluated.
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Discovery of a Novel Metalloregular Family: Structure/Function Studies of E. Coli Rcnr
The first row transition metal ions- Mn, Fe, Co, Ni, Cu and Zn are vital cofactors for proteins involved in diverse processes including photosynthesis, oxidative respiration and protein translation. Despite these essential functions, excess metal ions can lead to cell death through the generation …
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Impacts of wildfire activity in the wildland-urban interface on environmental mobilization and bioaccessibility of nanoscale trace metals, The
… matter, water contamination, and trace metal enrichment. However, less is known about the biogeochemical impacts of WUI wildfires. Given that structures are concentrated sources of metals (wiring, paints, treated wood, electronics, etc.), there is a growing need to characterize ash …
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Accumulation of Platinum Group Elements by the Marine Microalga, Chlorella stigmatophora
… of algae, an effect not reported for metal-marine algal interactions previously in the literature. Longer-term experiments showed that the rates of both overall accumulation and internalization were greatest for Pd and least for Pt. Consistent with this observation, the toxicity to C. …
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Monitoring and measuring the impacts and environmental implications of flood events on contaminated sediment dispersal in the River Swale catchment, North Yorkshire
… long been responsible for the release of heavy metals into the fluvial environment. As a consequence numerous studies have reported enhanced metal concentrations found in association with the sediments of rivers and in their surrounding floodplains. This thesis investigates the mobilisation, …
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Lichens as a biomonitoring tool for detecting heavy metal air pollution associated with industrial activities in Collie, south-western Australia
… effectively to determine the dispersion of heavy metals emitted by industrial point-sources; however the approach has not been commonly used in Australia. This thesis aimed to determine the effectiveness of using a lichen biomonitoring approach to measure the heavy metal pollutants emitted from …
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