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Wong, Wang-wah, i 黃宏華. "Trace organics pollution in the aquatic environment". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1993. http://hub.hku.hk/bib/B31252758.
Pełny tekst źródłaWong, Wang-wah. "Trace organics pollution in the aquatic environment /". [Hong Kong] : University of Hong Kong, 1993. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13498356.
Pełny tekst źródłaCotín, Martínez Javier. "Birds as Bioindicators of Pollution in Aquatic and Terrestrial Environments". Doctoral thesis, Universitat de Barcelona, 2012. http://hdl.handle.net/10803/101099.
Pełny tekst źródłaEn este estudio las aves serán utilizadas como bioindicadoras de contaminación por metales pesados en dos escenarios diferentes: el primero en un ambiente acuático, la cuenca del rio Ebro, mientras que el segundo tiene lugar en un ambiente terrestre, los Andes bolivianos. En el primer caso la fuente de contaminación es una fábrica localizada cerca de Flix, que produjo cientos de toneladas de lodos tóxicos. Así evaluamos si aves acuáticas como la Garza imperial reflejan la exposición potencial a los contaminantes de Flix entre zonas fluviales y deltaicas, comprobando su utilidad como bioindicadoras, y también examinamos si dichos residuos afectan a la contaminación de los hábitats donde la avifauna del Delta del Ebro se alimenta. Como resultados los isótopos estables mostraron la alta nitrificación y signaturas más bajas de carbono en el río y observamos que el Charrán común y patinegro actúan como especialistas en el Delta, mientras que Charrancito, Garceta común, Garza Imperial, Martinete y Gallineta de agua son generalistas, presentando amplios nichos tróficos. El mercurio en volantones de Garza Imperial en Flix y huevos de Gaviota de Audouin, Charrancito y Charrán común “Banya” en el Delta presentan valores alarmantes. El arsénico discrimina claramente entre especies marinas y dulceacuícolas. Ambos huevos y plumas son bioindicadores adecuados de contaminación, pero las plumas presentan más ventajas. El segundo estudio tiene lugar en los Andes Bolivianos, donde la actividad minera ha dado lugar a la acumulación de residuos. Evaluamos el potencial de las especies de Tinamúes como bioindicadoras de la exposición a dicha contaminación, incluyendo las diferentes vías de acumulación de plomo en las especies bioindicadoras. Como resultados, los pequeños territorios detectados y hábitos sedentarios hacen del Tinamú Pisacca un bioindicador adecuado de la contaminación local. Se recomienda el uso de plumas al son una muestra no invasiva. El mayor daño histopatológico se encontraron en muestras de riñón de las zonas contaminadas. La contaminación minera ha quedado de manifiesto con los altos niveles detectados en las dos especies estudiadas de Tinamú. El cálamo es la sección más adecuada para la evaluación de los niveles originales endógenos de plomo.
Tayab, Muhammad Rehan. "Environmental impact of heavy metal pollution in natural aquatic systems". Thesis, Brunel University, 1991. http://bura.brunel.ac.uk/handle/2438/5503.
Pełny tekst źródłaHalstead, Neal T. "Impacts Of Agrochemical Pollution On Aquatic Communities And Human Disease". Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5870.
Pełny tekst źródłaMiserendino, Rebecca Adler. "Tracing mercury pollution in aquatic ecosystems| Implications for public health". Thesis, The Johns Hopkins University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3571745.
Pełny tekst źródłaThis dissertation addressed questions pertaining to mercury (Hg) fate and transport in aquatic ecosystems by applying stable Hg isotopes as a tracer. Mercury poses a public health burden worldwide. In parts of the developing world, Hg-use during artisanal and small-scale gold mining (ASGM) is pointed at as the source of elevated Hg in the environment. However, Hg from other sources including soil erosion associated with land cover and land-use change (LCLUC) may also contribute to local Hg pollution.
Stable Hg isotope profiles of sediment cores, surface sediments, and soils from two aquatic ecosystems in Amapá, Brazil, one downstream artisanal gold mining (AGM) and one isolated from AGM were assessed. Although previous studies attributed elevated environmental Hg levels in this area to AGM, stable Hg isotopic evidence suggests elevated Hg downstream of AGM sites is dominantly from erosion of soils due to LCLUC.
In contrast, the impact of Hg-use during small-scale gold mining (SGM) in the Southern Andean Region of Portovelo-Zaruma, Ecuador on Hg in the trans-boundary Puyango-Tumbes River was also investigated. By comparing preliminary isotopic Hg signatures from river sediment along the Puyango-Tumbes to soil and sediment from upstream locations along the Puyango tributaries, we suggest Hg-use during SGM in this region is likely responsible for elevated Hg downstream and into Peru. Technical and policy challenges in measuring and responding to gold mining-related cumulative impacts were also reviewed in the context of Portovelo-Ecuador.
Together, the findings not only answer questions of critical importance to preventing Hg pollution in two of the world's most vulnerable ecosystems but also provide information that can be used to better target interventions to reduce environmental Hg levels and subsequent human exposures. Furthermore, the validation and application of the stable Hg isotope method to trace Hg pollution from ASGM in different aquatic ecosystems represents a critical step to the application of stable Hg isotopes to trace pollution in other complex natural environments and to address public health-related questions.
Murphy, Fionn. "Microplastic pollution in the aquatic environment : sources, destination & effects". Thesis, University of the West of Scotland, 2017. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.736949.
Pełny tekst źródłaCampbell, Andrew Thomas. "Some aspects of the aquatic and analytical chemistry of antimony and arsenic". Thesis, University of Southampton, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357182.
Pełny tekst źródłaAndrews, Stephanie Beth. "Heavy Metal Pollution in the Nu'uanu Watershed: Aquatic and Roadside Sediments". Thesis, University of Hawaii at Manoa, 2002. http://hdl.handle.net/10125/7057.
Pełny tekst źródłaix, 108 leaves
Ebrahimi, Mansour. "Effects of pollution on steroidogenesis and sperm in fish". Thesis, University of Sheffield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389736.
Pełny tekst źródłaReinhold, Dawn Marie. "Fate of fluorinated organic pollutants in aquatic plant systems studies with lemnaceae and lemnaceae tissue cultures /". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/26506.
Pełny tekst źródłaCommittee Chair: Saunders, F. Michael; Committee Member: Huang, Ching-Hua; Committee Member: Hughes, Joseph; Committee Member: Loeffler, Frank; Committee Member: Pullman, Gerald; Committee Member: Spain, Jim. Part of the SMARTech Electronic Thesis and Dissertation Collection.
de, Souza Machado Anderson Abel. "Coastal pollution of aquatic systems : literature review and experiments focusing on metal fate on estuaries". Thesis, Queen Mary, University of London, 2017. http://qmro.qmul.ac.uk/xmlui/handle/123456789/24637.
Pełny tekst źródłaAl-Omran, L. A. J. "The distribution and behaviour of phthalate esters in the aquatic environment". Thesis, University of Liverpool, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382038.
Pełny tekst źródłaSlinger, Peter Gerard. "The effectiveness of local air pollution control in Lancashire". Thesis, University of Central Lancashire, 2002. http://clok.uclan.ac.uk/20646/.
Pełny tekst źródłaWebb, Diane. "Assessment of the health of the Swan-Canning river system using biochemical markers of exposure of fish". Thesis, Curtin University, 2005. http://hdl.handle.net/20.500.11937/62.
Pełny tekst źródłaNuttall, Charlotte A. "Aquatic zinc pollution from abandoned mines : assessment and passive treatment in the Nent Valley, Cumbria, UK". Thesis, University of Newcastle Upon Tyne, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314092.
Pełny tekst źródłaChi, Siu-chung, i 池少翀. "Eco-toxicity of antibiotics on aquatic organism". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B43783600.
Pełny tekst źródłaCullen, Daniel W. "Genetic location and transferability of chromium resistance gene(s) among aquatic bacteria". Thesis, Glasgow Caledonian University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339325.
Pełny tekst źródłaChiu, Hok-cheung Simon, i 周鶴祥. "The use of bacteria to monitor and reflect pollution of the aquatic environment". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1992. http://hub.hku.hk/bib/B31210740.
Pełny tekst źródłaUllrich, Susanne Maria. "Industrial mercury pollution with particular emphasis on its impact in the aquatic environment". Thesis, University of Southampton, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438710.
Pełny tekst źródłaSnyder, Craig David. "Physiological, population, and genetic responses of an aquatic insect (Isonychia bicolor) to chronic mercury pollution". Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-06062008-165554/.
Pełny tekst źródłaAnsa-Asare, Osmund Duodu. "Do diurnal dissolved oxygen cycles have diagnostic value for assessing pollution status in lakes?" Thesis, University of Aberdeen, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285509.
Pełny tekst źródłaComber, Sean David William. "The biochemical control of arsenic in certain estuaries". Thesis, University of Southampton, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280907.
Pełny tekst źródłaAstley, Katrina Nicola. "The ecotoxicological assessment of complex effluents using invertebrate biomarkers". Thesis, University of Plymouth, 1998. http://hdl.handle.net/10026.1/2024.
Pełny tekst źródłaTront, Jacqueline Marie. "Plant Activity and Organic Contaminant Processing by Aquatic Plants". Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5234.
Pełny tekst źródłaHughes, Mary Siobhan. "A study of the aquatic environment in Northern Ireland for the presence of human enteroviruses in relation to public health". Thesis, Queen's University Belfast, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335411.
Pełny tekst źródłaWhite, Jessica C. "Comparative Bioavailability of Dietary and Dissolved Cadmium to Freshwater Aquatic Snails". Thesis, University of North Texas, 2003. https://digital.library.unt.edu/ark:/67531/metadc4351/.
Pełny tekst źródłaLeeming, Rhys, i n/a. "Coprostanol and related sterols as tracers for feacal contamination in Australian aquatic environments". University of Canberra. School of Resource, Environmental & Heritage Sciences, 1996. http://erl.canberra.edu.au./public/adt-AUC20060816.172519.
Pełny tekst źródłaCarr, Stephen Thomas David. "Investigation into phosphorus removal by iron ochre for the potential treatment of aquatic phosphorus pollution". Thesis, University of Edinburgh, 2012. http://hdl.handle.net/1842/7663.
Pełny tekst źródłaNwabineli, Betty Ivie. "A macro and micro study of the impact of sewage discharges to aquatic environments close to human habitats". Thesis, University of Newcastle Upon Tyne, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311990.
Pełny tekst źródłaКолмикова, Аліна Ігорівна. "Prospects for reducing the impact of phosphates on aquatic ecosystems". Thesis, Національний авіаційний університет, 2020. http://er.nau.edu.ua/handle/NAU/43595.
Pełny tekst źródłaThe object of research is the pollution of aquatic ecosystems with phosphates. The subject of research is the reduction of the impact of phosphates on aquatic ecosystems due to the improvement of wastewater treatment systems. The aim of the work was to analyze the prospects for reducing water pollution by phosphates and their impact on aquatic ecosystems due to the improvement of wastewater treatment system. Research methods: analytical, chemical, statistical methods of data processing. Relevance. In recent years, the amount of phosphates in the wastewater entering the treatment facilities of the city of Kyiv - Bortnytsia aeration station, has increased significantly. To date, it reaches almost 30 mg / l, with a standard discharge 8.0 mg / l. At this concentration of phosphates in the incoming water, the old treatment technologies do not allow to reach the established norms for wastewater, which causes eutrophication and death of aquatic organisms. The solution to this problem is to improve wastewater treatment systems and limit the use of phosphorus-containing detergents. Scientific novelty: an analysis of ways to reduce the impact of phosphates on aquatic ecosystems. Practical significance: the results of the study are prepared for implementation in a comprehensive program aimed at protecting aquatic ecosystems and reducing the content of phosphates in water bodies of Ukraine. Personal contribution of the author: elaboration of scientific literature on the topic of work, analysis of data of the Institute of Hydrobiology of the National Academy of Sciences of Ukraine and Kyivvodokanal, preparation for the implementation of research results.
Webb, Diane. "Assessment of the health of the Swan-Canning river system using biochemical markers of exposure of fish". Curtin University of Technology, Department of Environmental Biology, 2005. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=16725.
Pełny tekst źródłaBiopsies taken from feral black bream collected from eight sites during the period 2000 to 2002 from the estuary confirmed that the use of MFO induction in this fish species as a biomarker of exposure to organic contaminants is a reliable biomarker. Fish gender was a confounding factor in the interpretation of MFO induction when using the enzyme ethoxyresorufin-O-deethylase (EROD) as EROD activity was suppressed in both pre- and post-spawning female black bream. No such suppression was identified when using the MFO enzyme ethoxycoumarin-O-deethylase (ECOD). However, due to differences in the pattern and intensity of the induction of EROD and ECOD activities it was concluded that ECOD activity was not a substitute for EROD activity to detect certain chemical as ECOD activity represents a different cytochrome P450 pattern to EROD activity. No spatial, seasonal or interannual differences in the level of the enzyme sorbitol dehydrogenase (SDH) in the blood of the black bream were measured indicating that the interpretation of MFO activity induction was not compromised by hepatocellular damage. This study has shown that the black bream in the Swan-Canning Estuary are exposed to, and are metabolising polycyclic aromatic hydrocarbons (PAHs), notwithstanding that the chemical analysis of the contaminant load of these substances in the estuarine waters is consistently below laboratory detection limits. In addition, biomarker responses such as ECOD activity indicate that various other organic pollutants are present and are being metabolised by the black bream.
The measurement of biliary metabolites clearly show that, under winter conditions, the comprehensive drainage system of the Swan Coastal Plain contributes PAHs from pyrogenic sources such as burnt fuels into the estuary although the onset and intensity of rainfall events notably impacts on the volume of stormwater inflow. During the summer months, when freshwater flow is minimal, petrogenic sources of PAHs are dominant. Metabolic enzyme analysis points to the black bream being challenged in their aerobic capacities during summer, and that gill tissue was the most suitable tissue to evaluate the aerobic and anaerobic capacity of this fish species. Furthermore, there was a significant negative correlation between stress protein (hsp70) expression and DNA integrity in field-collected fish suggesting that the black bream within the estuary are highly stressed. No gradient of response in biomarker levels was identified in the Swan-Canning Estuary under either winter or summer conditions indicating there are multiple sources of inputs of potential pollutants along the length of the estuary. Stormwater and road runoff are the primary source of pollutant input into the estuary in the winter months, while summer biomarker levels, particularly PAH, appear to reflect the high usage of the estuary for recreational purposes and runoff from poorly irrigated parks and gardens. Significant rainfall events at any time of the year have the potential to adversely impact the biota of the estuary, particularly when these events result in a flush of water from the drains following long dry periods.
The study shows that the black bream is a suitable fish species to use under field conditions to detect the presence of bioavailable non-nutrient contamination within the Swan-Canning Estuary. A suite of biomarkers in black bream have been tested seasonally and annually but only a small number of biomarkers have proven suitable for routine monitoring of the health of the Swan-Canning Estuary. This treatise concludes with several recommendations for further investigations into biomarkers of fish health for the purpose of increasing our understanding on the sources and type of contamination entering the estuary, and potential effects on the aquatic biota of the Swan-Canning River system. These recommendations include, but are not limited to: (1) the need to determine baseline levels for the different biomarkers investigated in this study, (2) the examination of the Moore River or the Warren River estuaries as potential reference sites for biomarker studies in the Swan- Canning Estuary, (3) the advantage of identifying a second estuarine-dependent indigenous fish as a biomonitoring tool, (4) the requirement for a targeted study aimed at clarifying the relationship between major drain discharges, biomarker levels and impacts on river biota, and (5) a study of estuarine waters utilising SPMDs be undertaken in tandem with biomarker analysis of field captured fish would be beneficial.
Shang, Zhaorong. "A study of Ag-110m in aquatic and terrestrial ecosystems and the development of a radioecological model /". Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B23768782.
Pełny tekst źródłaToczydlowski, David G. "Aquatic microbial community responses to stress: comparison of nontaxonomic and taxonomic indices". Thesis, Virginia Tech, 1985. http://hdl.handle.net/10919/45672.
Pełny tekst źródłaSignificant differences in responses were discernible in 3 d when communities were transferred from reference to polluted sites. Chla/Pheo decreased more rapidly than other measurements. The predictive capability of laboratory flowâ through microcosm tests was examined by simultaneously transferring communities from upstream reference sites to downstream field sites and to various dilutions of field effluent in the laboratory.
Master of Science
Lahman, Sara Elisabeth. "The Ecotoxicological Impacts of Copper in Aquatic Systems". Bowling Green State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1427119997.
Pełny tekst źródłaGreen, Christopher. "Assessing the roles of anti-androgenic and oestrogenic mixtures on endocrine disruption in fish". Thesis, Brunel University, 2014. http://bura.brunel.ac.uk/handle/2438/10838.
Pełny tekst źródłaFulton, Barry A. Brooks Bryan William. "Assessing interactions between nutrients and toxicity influences of nitrogen and phosphorus on triclosan toxicity to the aquatic macrophyte "lemna gibba" /". Waco, Tex. : Baylor University, 2009. http://hdl.handle.net/2104/5351.
Pełny tekst źródłaSubirats, Medina Jessica. "Influence of anthropogenic pollution on the prevalence, maintenance and spread of antibiotic resistance in aquatic microbial communities". Doctoral thesis, Universitat de Girona, 2018. http://hdl.handle.net/10803/664265.
Pełny tekst źródłaLa present Tesi demostra que els microorganismes procedents de les aigües residuals són el principal factor implicat en distribuir la resistència als antibiòtics (AR) al medi natural i que la contaminació de fons per antibiòtics i altres fàrmacs estableix les condicions òptimes per la seva acumulació i disseminació entre les comunitats microbianes residents. També es demostra aquí que els nutrients, en combinació amb diferents contaminants emergents, actuen en sinergia per estimular la disseminació d'alguns gens de resistència als antibiòtics (ARGs) en les comunitats bacterianes. Segons els nostres resultats, els biofilms del llit fluvial esdevenen útils com a biosensors de l’efecte de les descàrregues d’aigües residuals en la prevalença de la AR en aigües superficials. Finalment, aquesta tesi també aporta resultats que proven que els bacteriòfags (virus que infecten bacteris) acumulen ARGs i, per tant, poden tenir un paper important en la disseminació de la AR en els ambients aquàtics
COELHO, RICARDO dos S. "Avaliacao da qualidade da agua do corrego Franquinho, sub-bacia Tiquatira/Franquinho, unidade hidrografica do Alto Tiete, Sao Paulo, SP". reponame:Repositório Institucional do IPEN, 2001. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10920.
Pełny tekst źródłaMade available in DSpace on 2014-10-09T14:08:31Z (GMT). No. of bitstreams: 1 07157.pdf: 8474280 bytes, checksum: e1abd151fab0e19dd4d6f348fcc3f112 (MD5)
Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
Shang, Zhaorong, i 商照榮. "A study of Ag-110m in aquatic and terrestrial ecosystems and the development of a radioecological model". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B29747326.
Pełny tekst źródłaMeyer, Lars Alan. "In Light of Energy: Influences of Light Pollution on Linked Stream-Riparian Invertebrate Communities". The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1345479410.
Pełny tekst źródłaArnolds, Judith Lize. "Oxidative stress responses in the aquatic macrophyte, Ceratophyllum Demersum L., as biomarkers of metal exposure". Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2649.
Pełny tekst źródłaMetal pollution in aquatic environments is considered a major environmental concern because of variation in several abiotic factors that impose severe restrictions on organisms living in these areas. Ceratophyllum demersum L. (family Ceratophyllaceae), a hornwort or coontail, free floating rootless macrophyte has been suggested a suitable model for investigating metal stress and was used in the current study. This study assessed the use of selected biological responses, namely antioxidant responses and changes in chlorophyll concentration in Ceratophyllum demersum L., as biomarkers of metal exposure, and also investigated the field application of these responses in the Diep River. The ultimate aim was also to determine the usefulness of C. demersum as model of metal contamination and as phytoremediator after a pollution event. An investigation of metal bioaccumulation in this macrophyte exposed to different concentrations of a combination of metals over a five-week exposure period in a greenhouse, was undertaken, as well as a field study in the Diep River, Milnerton, Cape Town and a pond (reference site) at the Cape Peninsula University of Technology, Cape Town, to validate experimental results. In the laboratory study the water was contaminated once off at the beginning of the study, to simulate a pollution event. The metal concentrations in the water and plants were measured in the four treatments and the control every week over a five-week exposure period. The samples were acid-digested and analysed with an Inductively-Coupled Plasma-Mass Spectrophotometer (ICP-MS). The results showed that concentrations of the metals in the water varied in all treatments over time with no specific patterns amongst the treatment groups. This macrophyte proved highly effective in the bioaccumulation of these metals at all four exposure concentrations. The metals bioaccumulated rapidly in the plants after the water was spiked. The main focus of the study was to investigate the possible use of biochemical responses in C. demersum as possible biomarkers for metal exposure. A range of antioxidant/oxidative stress parameters were measured in the plant exposed to a combination of metals (Al, Cu, Fe, Zn) in four different treatments over the five week exposure period. Total antioxidant capacity (TAC) was measured using Total Polyphenols (TP), Ferric Reducing Antioxidant Power (FRAP) and Oxygen Radical Absorbance Capacity assay (ORAC), enzyme activity was determined using Catalase (CAT), Superoxide Dismutase (SOD), Ascorbate Acid (AsA) and Total Glutathione (GSHt) and lipid peroxidation was measured by using Thiobarbituric Acid Reactive Substances (TBARS) and Conjugated Dienes (CDs). The cocktail of the four metals induced significant changes in the antioxidant defence system of C. demersum, including the antioxidant enzyme activities. The different metal exposures disturbed the cellular redox status in the plant. The current study has demonstrated that this macrophyte shows tolerance to metal-induced oxidative stress and that it can survive under relatively high concentrations of these metals by adapting its antioxidant defence strategies. Chlorophyll was extracted in 80% chilled acetone in the dark and the absorbance values were determined using a spectrophotometer. Chlorophyll a (chl a), chlorophyll b (chl b) and total chlorophyll (chl t) contents were measured under different exposure concentrations of metals in the macrophyte. The results of this study indicated that chlorophyll contents were variable over the exposure period and no significant differences in chlorophyll concentrations were found between weeks. A field study in the Diep River and the pond located at the CPUT campus (reference site) was conducted to validate experimental results. Plants in a polluted section of the Diep River were shown to bioaccumulate metals to high concentrations. Bioaccumulation of metals in C. demersum might have induced oxidative stress, and other environmental factors such as temperature- and chemical stress might have caused chlorophyll degradation. The chlorophyll concentrations in the plants of the pond (reference site) might also have been affected by temperature and chemical stress of the water. Significantly higher AsA, CAT, ORAC, SOD and TBARS concentrations in the Diep River plants might be an indication that the plants in the river might be well adapted to the constant exposure to metals and that the plants might have developed a tolerance mechanism to cope with oxidative stress compared to those of the pond. The results show that metals are bioaccumulated quickly by C. demersum after the water is contaminated with metals, i.e. after the "pollution event". However, over time, metals are continuously exchanged between the plants and the water, accounting for the fluctuations in metal concentrations observed over time. This study has shown that C. demersum has phytoremediation potential because it was able to remove high concentrations of metals from the contaminated water. Therefore, C. demersum, can be applied as a model for metal contamination and a phytoremediator after a pollution event. The potential to antioxidant responses and chlorophyll content as biomarkers of metal exposure in C. demersum have been demonstrated.
Hum, Stanley. "Detection of latent heritable genetic damage in populations of aquatic snails, Lymnaea stagnalis, exposed in situ to genotoxic pollution". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0035/MQ64374.pdf.
Pełny tekst źródłaHum, Stanley. "Detection of latent heritable genetic damage in populations of aquatic snails, Lymnaea stagnalis, exposed in situ to genotoxic pollution". Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=30670.
Pełny tekst źródłaAgars, Robert C., University of Western Sydney, of Science Technology and Environment College i of Science Food and Horticulture School. "Assessment of the potential environmental effects of soluble hydraulic oil on natural waters". THESIS_CSTE_SFH_Agars_R.xml, 2001. http://handle.uws.edu.au:8081/1959.7/249.
Pełny tekst źródłaMaster of Science (Hons)
de, Souza Machado Anderson Abel [Verfasser]. "Coastal pollution of aquatic systems : Literature review and experiments focusing on metal fate on estuaries / Anderson Abel de Souza Machado". Berlin : Freie Universität Berlin, 2017. http://d-nb.info/1149513004/34.
Pełny tekst źródłaKannan, Narayanan. "A robust methodology to predict diffuse source pollution in the aquatic environment : A case study for the Colworth catchment, Bedfordshire". Thesis, Cranfield University, 2003. http://dspace.lib.cranfield.ac.uk/handle/1826/11355.
Pełny tekst źródłaErasmus, Deborah Vivian. "Metal bioaccumulation, membrane integrity and chlorophyll content in the aquatic macrophyte ceratophyllum demersum from the Diep River, Western Cape". Thesis, Cape Peninsula University of Technology, 2012. http://hdl.handle.net/20.500.11838/2027.
Pełny tekst źródłaThe Diep River is approximately 80 km in length and runs through agricultural land and urban parts of greater Cape Town, South Africa before entering the Atlantic Ocean, via an estuary. Generally, metal pollution in South African rivers is not well documented and using plants to monitor metal bioaccumulation is even less documented. The aim of this study was to investigate aluminium, iron, copper and zinc metal pollution in the Diep River and bioaccumulation of these metals in the leaves and stems of the submerged macrophyte Ceratophyllum demersum L. Furthermore, the effects of bioaccumulated metals on membrane integrity and chlorophyll content of these plants were investigated. Site 1 was situated in the upper reaches of the river adjacent to agricultural land, while site 2 was in an urban area, where industrial activities predominate. C. demersum (from an uncontaminated source) were introduced into the river at the two sites and compared with one another on a fortnightly basis over a 12 week period. Plants at site 2 were also compared to existing plants that were naturally growing at the site. Comparisons were also made between leaves and stems of the plants, to establish the organ of preference regarding metal accumulation and storage. Samples were digested with nitric acid and an ICP-MS was used to analyse metal concentrations in the water, sediment and plants. Chlorophyll extraction was done using dimethyl sulphoxide (DMSO) and the absorbance values determined using a spectrophotometer. Chlorophyll a, chlorophyll b and total chlorophyll contents were recorded and compared. Cell membrane integrity was determined by leaving plants for 24 hours in deionised water and measuring electrical conductivity and solutes (sodium, calcium, potassium and magnesium) before and after placement of the plants.
Yi, Xianliang Andy, i 易先亮. "A comprehensive study on the ecological toxicity and risk of triphenyltin to aquatic organisms". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/202351.
Pełny tekst źródłaClements, William H. "Community responses of aquatic macroinvertebrates to heavy metals in laboratory and outdoor experimental streams". Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/53937.
Pełny tekst źródłaPh. D.