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 55 for “"Freshwaters"”.
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Effects of water treatment on pesticides in freshwaters.
… for the removal of selected pesticides from freshwaters. Of particular interest were the herbicides likely to contaminate water courses used for potable water supplies in Grampian Region. Laboratory based simulation experiments were set up to determine the removal of chlorphenoxyalkanoic …
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Determination of Atrazine Concentration in Freshwaters Using Fluorescence Spectroscopy
<p>Atrazine is the most widely used herbicides in USA, but its negative impact on aquatic ecosystem cannot be over-looked. Atrazine was traditionally determined through liquid/gas chromatography or IR spectroscopy. However, these methods are either time-consuming or costly, so fluorescence …
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Effects of artificial light at night on benthic primary producers in freshwaters
… growth, production and community structure. Freshwaters are increasingly illuminated at night, as they are often located near the human population centers. Despite this, the impacts of artificial nocturnal illumination in freshwater ecosystems are still largely unknown. In particular, effects …
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Establishing the Citizen Science Stream Index (CSSI) to monitor water quality in freshwaters
Streams and rivers are amongst the most endangered ecosystems in the world. Water quality is an important measure for maintaining ecosystem function. Despite several decades of the EU Nitrates and Water Framework Directives, inputs of nutrient-rich organic matter of both agricultural and municipal …
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DYNAMICS OF MICROCYSTIS-INFECTING CYANOPHAGES IN TROPICAL FRESHWATERS THROUGH QPCR AND NEXT GENERATION SEQUENCING
… and dynamics of the viral community in tropical freshwaters.
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Developing a stable isotope approach to trace the sources and metabolism of phosphorus in freshwaters
… of dissolved inorganic phosphate (Pi) from freshwaters and its isolation from other oxygen-containing compounds, including nitrate, sulfate and dissolved organic matter. Excluding contaminant sources of oxygen during δ18Op analysis is a critical analytical challenge that has constrained …
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The use of lipid profiles from immobilised selenastrum capricornutum in the biological surveillance of freshwaters
The use of lipid profiles from the immobilised alga Selenastrum capricornuizim was investigated as a potential indicator of heavy metal pollution in freshwater environments. The toxicity of Cu", Zn 2 and Cd2t on algal growth was determined and the effective concentration inhibiting specific growth …
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The detection and quantitation of agricultural chemicals in some freshwaters used for potable water supplies in Grampian Region.
The purpose of this project was to examine local sources of potable water supply for traces of organic pollutants which have been used during agricultural practices. A specific aim was to analyse water sources for herbicides (weedkillers) regularly used within the area of Scotland known as Grampian …
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Climate change and conservation policy: developing adaptation strategies to minimise climate change impacts to the conservation interest of Scotland’s standing freshwaters
… GIS techniques to investigate Scottish standing freshwaters in depth. 5,165 Scottish lakes exhibit an outstanding myriad of forms and sizes ranging across the country. This variety of form, density and distribution contribute to habitats of international importance for numerous species. Perhaps …
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Urea as an Effective Nitrogen Source for Cyanobacteria
… with the reappearance of cyanobacteria blooms in freshwaters. Here, we examined urea as a nitrogen source for three bloom-forming cyanobacteria species. We found that (1) urea was consumed more rapidly relative to inorganic nitrogen substrates, suggesting that cyanobacteria exhibit a preference …
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Recruitment from resting stages among bloom-forming cyanobacteria
… are known to form heavy blooms in eutrophicated freshwaters and also form resting stages, associated with the sediments, during harsh growth conditions. These resting stages can serve as inoculum for pelagic populations and function as a potential source for bloom formations. However, the factors …
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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.
LITERATURE 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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Organic Phosphorus Dynamics and Contributions to Eutrophication in a Shallow, Freshwater Bay
… ecological balance. Its addition into P-scarce freshwaters, either through terrestrial (external) or sedimentary (internal) loading, may disrupt this balance causing blooms of phytoplankton to flourish, often resulting in harmful environmental and anthropogenic consequences. Accordingly, …
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Evaluating the emerging environmental risks of mycotoxins in freshwater ecosystems.
… interest into the potential transference into freshwaters. Multiple reports of mycotoxin occurrence in freshwater samples have led to their consideration as natural chemicals of emerging concern, particularly with ZON seen to act in an oestrogenic nature, yet the ecotoxicological data to …
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Testing the efficacy of mitigation measures for reducing fine sediment and associated pollutant delivery to and through rivers in agricultural catchments of England
… has contributed to the degradation of freshwaters in the UK, through enhanced delivery of fine sediment and associated contaminants, leading to sedimentation and eutrophication. European legislation (Water Framework Directive 2000/60/EC) and subsequent UK government initiatives such as …
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Contextualization and Sodium Diet Implications of Occoquan Reservoir Salinization
… in increased ion concentrations in inland freshwaters. This syndrome threatens healthy aquatic ecosystems and can alter the perception of the potability of finished drinking water. The Occoquan Reservoir, located in Northern Virginia, is a freshwater system that is facing rising …
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Investigations of microcystins (cyanobacterial peptide toxins) detection, purification and analysis.
… (blue-green algae) occur commonly in British freshwaters sometimes producing extensive growths known as water blooms. This study was an investigation of microcystins, the cyclic heptapeptide toxins produced by cyanobacteria. The method of detection relied on high performance liquid …
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The impacts of climate change on freshwater microbes: Insights from the field to the laboratory
… biodiversity. The microbial diversity within freshwaters is phylogenetically and functionally diverse. Yet, the impacts of warming on these complex communities are largely unknown. To date, the vast majority of research ignores the complexity of natural systems, instead, exploring freshwater …
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Bovine faecal contamination in an Irish agricultural catchment: sources and pathways
… been an intensive source of contamination on freshwaters worldwide. Faecal contamination is one of the most under regulated and poorly understood pollutants within Irelands surface waters, despite is widely recorded ability to cause harm to both animals and the environment. Creating novel …
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The large scale understanding of natural organic matter : processes and application
… A model of UV absorbance was tested against freshwaters that were biased towards eutrophic conditions. The results demonstrated the weak absorbing components of algal DOM, and new variable model parameters were introduced, which quantified the contribution of algal DOM. This could have …
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