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 25 for “"Environmental Concentrations"”.
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Effectiveness of a closed system device in reducing occupational exposure and environmental concentrations of anticancer drugs
… with anti-cancer drugs on work surfaces and the environmental emissions of these drugs. In the Isolator study, surface contamination arising from the preparation of five anticancer drug infusions (epirubicin, fluorouracil, cisplatin, oxaliplatin and carboplatin) in a pharmaceutical isolator and …
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Organotin and osmoregulation: quantifying the effects of environmental concentrations of sediment-associated tri-n-butyltin and triphenyltin on osmoregulatory processes in the European flounder Platichthys flesus (L)
… Platichthys flesus (L.), caused by exposure to environmental concentrations (150 ng triorganotin g<sup>-1</sup> dry weight sediment) of sediment-associated tri-o-butyltin chloride (TBTCl) and triphenyltin chloride (TPhTCl), was examined and quantified. Radiotracers were used to measure …
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Ecotoxicological assessment of galaxolide and tonalide as contaminants of emerging concern in marine ecosystems
… These substances have been detected in all environmental compartments and, due to their inherent lipophilicity, they easily bioaccumulate in aquatic organism. The aim of this PhD thesis was to assess the risk of environmental concentrations of HHCB and AHTN in the marine environments. In …
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Understanding the fate of active pharmaceutical compounds in waters receiving poorly or untreated wastewater for the development of a dedicated environmental risk assessment approach
… ingredients (APIs) is of a growing environmental concern. The inherently biological activity of APIs creates a concern of potential ecotoxicological effects even at very low concentrations. Such risk is particularly exacerbated in low and low-middle income countries (LLMICs) where it …
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Development of regionalized multimedia chemical fate models for China
To balance the economic development with environmental safety and human health, China has released chemicals management legislation for which chemical prioritization and risk assessment are key issues. To support these ambitions two versions of an environmental fate and behaviour model SESAMe (Sino …
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Occurrence and fate of endocrine disrupting chemicals and other hydrophobic organic compounds in a tropical river in Kenya
… capable of quantifying aquatic pollutants at low environmental concentrations, and in a form that is directly applicable to risk assessment. Two passive samplers, namely polyethersulfone (PES) and silicone rubber (SR), were used to monitor some endocrine disruptors (EDCs) and hydrophobic organic …
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Transport of the Herbicide Atrazine on Suspended Sediments During a Spring Storm Event in Mammoth Cave, Kentucky
… disruptor and has been shown to be toxic at low environmental concentrations. Atrazine has the capacity to adsorb to soil particles, which in karst areas such as those found in south central Kentucky can be transported directly into the groundwater. Suspended sediments and water were collected …
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Environmental risk assessment and human pharmaceuticals: limitations and future improvements
… reported. All new pharmaceuticals require an environmental risk assessment (ERA) prior to market authorisation. The aims for this research were to (1) assess the limitations of the current ERA by comparing crude and refined predicted environmental concentrations (PECs) used in ERAs with …
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Science to support toxics governance : tracking mercury and other pollutants from policy to impacts
… toxins like mercury pose unique challenges for environmental governance. The complexity of their movement through coupled social, technological, and natural systems can make it difficult to trace their path from emissions to wider impacts, as emissions and impacts can be separated both in time …
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The occurrence and distribution of microplastics in surficial sediments and fish in a South African reservoir
Microplastics have become a major environmental concern globally due to their potential impacts on ecosystem function. They are known to be ubiquitously present, persistent and bio−accumulative, yet ecological impacts of microplastic remain poorly understood despite their ubiquity across all …
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FATE, TRANSPORT, AND MIXTURE TOXICITY OF TRANSGENIC BACILLUS THURINGIENSIS CORN (ZEA MAYS) AND ASSOCIATED INSECTICIDES
… The goal of my dissertation was to measure the environmental fate of the Cry1Ab Bt corn protein, clothianidin, and tefluthrin and determine if measured concentrations could be causing effects to non-target species. The Cry1Ab proteins persisted only during the corn growing season in soil, runoff …
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Evaluation of Fish Scale Chemistry for Determining Habitat Associations
… xanthurus</em>) were held in four concentrations of Sr, Cd, and Ba maintained at either 20°C or 25°C, for 42 days. Strontium:Ca, Cd:Ca, and Ba:Ca levels in scales were linearly related to environmental concentrations while temperature had no effect. These results suggested scale …
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Occurrence, Fate and Transport of the Primary Metabolites of Trenbolone Acetate in CAFO Soils and Surface Water Runoff
… acetate. Therefore, to measure steroid concentrations of these metabolites in feedlot runoff, a series of rainfall simulation experiments were conducted on research feedlots at the University of California, Davis, Animal Science Facility. Soil samples were also collected from a …
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P-glycoprotein and membrane permeability as determinants of xenobiotic bioavailability and bioaccumulation
… bioavailability and bioaccumulation of environmentally relevant pharmaceuticals, tetracycline and ivermectin, and the carcinogen benzo[a]pyrene in catfish. The pesticide dieldrin and surfactant linear alkylbenzene sulfonate (LAS) were selected as mixture components thought to have …
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Automated hydrodynamic trap for single cell analysis in free solution
… by long diffusive timescales to alternate environmental concentrations. In this work, we report a microfluidic-based platform for single cell analysis that provides dynamic control over periodic, time-dependent culture media. Single cells are confined in free solution by the sole action of …
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Accumulation of Platinum Group Elements by the Marine Microalga, Chlorella stigmatophora
… isotherms were quasi-linear up to PGE concentrations of 30 ug L-1, although Pd displayed convexity, hence saturation of available binding sites, at greater concentrations. The pH, adjusted between about 5.5 and 9.5 by addition of acid or base, did not have a great impact on PGE …
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LITERATURE REVIEW: The Use of Cation-Exchange Resins in Natural Water Trace Metals Research. ARTICLE: Determination of Free Ion Trace Metal Concentrations in Freshwaters Using Cation-Exchange Resin Equilibrium. A Preliminary Investigation.
… REVIEW: The desire to measure low metal concentrations in natural waters stems principally from the aim to understand the effects of trace metals on aquatic biota and to understand the fate of metal pollutants. Trace metals rarely exist in the free ion form, with distribution of the …
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Investigating metal exposure on the general populace of the copper mining town of Kitwe, Zambia
… mining areas. Recent research has focused on the environmental impact of copper mining byproducts such as lead, cadmium, copper, cobalt and arsenic, found at elevated concentrations in the Copperbelt region of Zambia. Although the environmental metal concentrations are well known, the human health …
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Studies of the synthesis, environmental occurrence and toxicity of unresolved complex mixtures (UCMs) of hydrocarbons
… presence of an aromatic UCM is often ignored and environmental concentrations of aromatic UCM hydrocarbons in marine biota and sediments are rarely reported. The aims of this study were to establish the quantitative significance of aromatic UCMs in environmental samples and to assess the …
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The Photodegradation of Diazepam and its Human Metabolites in Water
In recent years, the environmental occurrence, fate and effects of pharmaceuticals or pharmaceutically active compounds (PhACs) and their metabolites have received increased attention. PhACs have been detected in wastewater, river water, marine waters and even sewage sludge and soil. Since PhACs …
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