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 17 of 17 for “"chemical contamination"”.
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Hardness variation and cyclic crystalline-amorphous phase transformation in CuZr alloy during ball milling
… approximately 320 minutes. Although significant chemical contamination was found in the milled specimens, the results shed some light on mechanical alloying theory and favor interpreting mechanical alloying as a driven alloys process.
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Validation of the Planarian Bioassay With Defined Mixtures and Testing Against Other Bioassays With Contaminated Samples From Pakistan
… to assess toxicologic effects caused by pure chemicals and chemical mixtures; (b) assess chemical contamination in environmental samples from selected areas in Pakistan where industrial contamination was suspected; (c) test the sensitivity of the planarian model and other bioassays to …
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Lethal and Semilethal Mutation Frequency of the First and Second Chromosomes in Two Natural Populations of "Drosophila melanogaster"
… captured in an area believed to be free of chemical contamination. Procedure. The Basc technique for determining X-linked lethal mutation frequency and the Cy/Pm method for determining second chromosome lethal mutation frequency were employed. Mutation frequencies were calculated and data …
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PFAS and the Future of Rural Land
… thesis, I will explain how the problem of PFAS chemical contamination on farmland in the United States emerges from and connects with other environmental, agricultural and economic challenges in rural areas. Using Maine as a case study, I will evaluate the policy response that took place in …
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An economic analysis of low-input agriculture as a groundwater protection strategy
The unique characteristics of agricultural contamination of groundwater requires an innovative solution, such as the voluntary use of low-input agriculture (LIA) practices. This study was conducted to identify potential barriers to LIA adoption, analyze the effectiveness of agriculture and natural …
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Exploring culturally meaningful definitions of justice and resilience through the lens of sovereign Indigenous foodways
… occurs: the physical manipulation of waterways, chemical contamination, the introduction of species, the exploitation of culturally significant species, and global climate change. The supplementary material for chapter one is an expanded list of all literature reviewed. In the second chapter, I …
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The Development of a Bacterial Biosensor Designed to Detect Oxidative Chemicals in Water: Correlating Sensor Relevance to Mammalian Brain Cells and Assessing Bacterial Cell Immobilization Strategies
Oxidative stress-inducing chemical contamination in the environment is a significant concern for public health. The depletion of antioxidants by these chemicals results in oxidative stress which may cause detrimental effects in many cell types. For example, multiple stress responses may be …
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Embryotoxicity of dioxin-like chemicals extracted from American eels (Anguilla rostrata) from the St. Lawrence River System
… physical barriers (hydroelectric dams), and chemical contamination are all possible reasons for recruitment decline and may be acting cumulatively. Maternally derived dioxin-like contaminants (DLCs) accumulated during the growth phase of eels in Lake Ontario are toxic to fish embryos, and …
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Evaluating Chemical Toxicity: A Novel Behavioral Assay Using Daphnia
… ultimately affect fitness and survival. These chemicals are often found in the environment as complex mixtures, and this complicates their evaluation of their toxicity. There is a need for high-throughput assays to rapidly assess the toxicity of these emerging contaminants. A behavioral assay …
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The application of the Kelvin probe in materials science.
… and impurities in semiconductors, namely iron contamination, is demonstrated via two methods based on the measurement of the surface photovoltage. We find that both methods yield a lower surface potential and surface charge for iron contaminated wafers compared to a clean sample and therefore …
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Appraisal and validation of rapid, integrated chemical and biological assays of environmental quality
… it is necessary to determine both the extent of contamination and the biological effects they give rise to. This research is based on a tiered system, which commences with conventional analytical chemistry (gas chromatography), followed by the development, evaluation and application of rapid and …
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A study on the properties of graphene nanoribbons for electronics
… potentially significant amounts of residues and chemical contamination. In this thesis, we explore AFM-based scanning probe lithography (SPL) as an alternative method for the minimization of graphene-based field effect transistors (G-FETs), as it is single-step, potentially higher resolution, and …
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Acoustically-levitated drop reactor (ldr) employable for kinetics measurements of biochemical networks
… part of understanding the mechanisms of biochemical reactions. The typical means of studying such systems use stirred cuvettes, stopped-flow apparatus, microfluidic systems, or other small sample containers. These reaction-kinetics measurements reactors are usually made of quartz, glass, or …
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The Role of Multidrug Efflux Pumps in the Stress Response of Pseudomonas aeruginosa to Organic Contamination
… drivers of change in any ecosystem. Through chemical contamination of natural environments, these communities are exposed to many different types of chemical stressors; however, research on whole genome responses to this contaminant stress is limited. This research examined the stress …
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Macrobenthic community and ecotoxicological status of the Nhlabane Estuary
… community, as well as the potential trace metal contamination of the estuary water, sediment and biota due to mining activities. The study aimed to describe the macrobenthic community of the Nhlabane Estuary during the post-drought period 1996-1999, to assess the ecotoxicological status of the …
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Global Discontents
My creative project explores toys as means to express economic issues of globalization. By exploiting the educational and imaginative aspects of toys for adults and children, I intend to reflect on the impact and pressures of globalization on employment, technology and environment. In creating …