Дисертації з теми "Heavy metals – Physiological effects"
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Chen, Xuehui. "Accumulation of heavy metals and organochlorine pesticides in human milk and adipose tissues, and its health concerns." HKBU Institutional Repository, 2007. http://repository.hkbu.edu.hk/etd_ra/779.
Повний текст джерелаMaleri, Rudolf A. "The ability of terrestrial Oligochaeta to survive in ultramafic soils and the assessment of toxicity at different levels of organisation." Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019.1/1200.
Повний текст джерелаMetals are natural elements of the earth crust usually present at low concentrations in all soils. Although many metals such as cobalt, copper, iron and zinc are essential to living organisms, at elevated concentrations most metals are toxic to organisms living in and on soils. Elevated concentrations of metals are caused either by anthropogenic deposition following remobilisation from the earth crust or are of natural origin. Ultramafic soils do not only pose unfavourable living conditions such as drought and poor organic content, these soils are also characterized by extremely high concentrations of a range of metals known to be toxic under normal circumstances. Ultramafic soils are of high ecological importance as a high proportion of endemic organisms, especially plants, live on these soils. As it is known that earthworms do occur in ultramafic soils, the aims of the present study were to investigate the abilities of earthworms to survive in these soils and the influences of elevated chromium, cobalt, copper, manganese and nickel levels. For the evaluation of the metal background conditions, soils originating from ultramafic rocks of the Barberton Greenstone Belt, Mpumalanga, South Africa were collected and different fractions representing different levels of bioavailability were analyzed for arsenic, chromium, cobalt, copper, manganese and nickel. To assess the mobile, readily available metal fraction, i.e. Ca2+- exchangeable metal cations, a 0.01 mol/L CaCl2 extraction was performed. To investigate the mobilisable metal fraction, representing the amount of easily remobilisable complexed and carbonated metal ions, a DTPA (di-ethylene-triamine-pentaacetic acid) extraction was conducted. In relation to non-ultramafic or anthropogenic contaminated soils, a far lower proportion of metals were extractable by the above mentioned extraction methods. To investigate the availability and effects of these metals on earthworms, two ecophysiologically different species were employed. Aporrectodea caliginosa and Eisenia fetida were long-term exposed to the ultramafic soils collected at the Barberton region and a control soil from a location at Stellenbosch with a known history of no anthropogenic metal contamination. The responses to the ecological stress originating in the ultramafic soils were measured on different levels of earthworm organisation. As endpoints affecting population development, cocoon production, fecundity and viability were evaluated. On individual level, growth, metal body burden and tissue distribution were investigated. As endpoints on subcellular level, the membrane integrity was assessed by the neutral red retention assay, the mitochondrial activity was measured by the MTT colorimetric assay and as a biomarker for the DNA integrity, the comet assay was performed. Focussing on manganese and nickel, the uptake by E. fetida of these metals was investigated with the exclusion of soil related properties using an artificial aqueous medium to draw comparisons to the uptake of these metals in natural soils. The possible development of resistance towards nickel was tested by exposing pre-exposed (for more than 10 generations) E. fetida specimens to ultramafic soils with concentrations of more than 4000 mg/kg nickel. The results showed that, except on the endpoint survival, which was less sensitive than all other bioassays, significant responses to the ultramafic challenge were observed in all earthworm bioassays and on all levels of organisation. The sensitivity of the responses of the earthworms towards the ultramafic conditions was not predictable by the level of organisation. The two species showed different strategies of metal elimination. In A. caliginosa, metals such as nickel, manganese and chromium were transported to the posterior section and the posterior section was subsequently pushed off by autotomization. In E. fetida, metals such as chromium and nickel were sequestered in storage compartments in the coelomic cells or fluid. Other metals, such as cobalt, were not taken up at elevated concentrations. Although an increased accumulation of nickel was observed in E. fetida specimens pre-exposed to nickel, development of resistance or cross resistance was not observed in this species. In contrast, pre-exposed specimen exposed to elevated concentrations of nickel showed a higher sensitivity in terms of survival, indicating the absence of acclimatisation or even genetic adaptation. A comparison of the two species employed indicated that A. caliginosa was less suited for the assessment of the ultramafic soils due to the high individual variation in metal body burden, the mass loss observed and the slow reproduction rate even in the control soils. This happened despite the fact that A. caliginosa was a soil dwelling species supposed to be better adapted to the soil substrate than the litter dwelling E. fetida. The toxicity of the ultramafic soils was not necessarily related to total or environmentally available amounts of the selected metals. Thus, it can be speculated that either these soils contained unidentified toxicants with resulting interactions between toxicants playing an important role or earthworms were able to remobilize metals occurring in these soils. As the singular application of an ecotoxicological endpoint did not give reliable results, especially seen over the duration of the exposures, it can be concluded that, when studying soils with such a complex composition, the utilisation of endpoints addressing different levels of organisation is necessary for the assessment of toxic stress emerging from these ultramafic soils.
Farris, Jerry L. "Cellulolytic responses to heavy metal accumulation in Corbicula fluminea and Mudalia dilatata." Diss., This resource online, 1986. http://scholar.lib.vt.edu/theses/available/etd-01242009-063436/.
Повний текст джерелаDe, Angelis Fabien. "Characterization of proteins involved in RND-driven heavy metal resistance systems of Cupriavidus metallidurans CH34." Doctoral thesis, Universite Libre de Bruxelles, 2010. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210154.
Повний текст джерелаDoctorat en Sciences agronomiques et ingénierie biologique
info:eu-repo/semantics/nonPublished
Carvalho, Marcia Eugenia Amaral de. "Integrated approach of anatomical, physiological and biochemical parameters for the study of tolerance mechanisms to cadmium in tomato accessions." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/11/11137/tde-09102017-172803/.
Повний текст джерелаO consumo de tomate (Solanum lycopersicum L.) tem aumentado a cada ano devido a atratividade dos frutos, suas diversas utilizações e efeitos benéficos para a saúde humana. No entanto, os frutos de tomate podem acumular uma concentração de cádmio (Cd) que excede o limiar de segurança para o consumo humano, mesmo quando as plantas são cultivadas em solo com níveis aceitáveis de Cd. Cádmio e um elemento não-essencial, extremamente perigoso para os sistemas biológicos, desencadeando varias doenças em seres humanos. Nas plantas, o Cd perturba a maquinaria antioxidante, altera o estado nutricional e prejudica a produção e /ou o particionamento de fotoassimilados, frequentemente reduzindo a produtividade e qualidade de frutos. No entanto, diferentes acessos de tomateiros podem apresentar contrastantes graus de tolerância a toxicidade gerada pela exposição ao Cd, como detectado em estudos anteriores de nosso grupo. O uso desses acessos e uma abordagem poderosa para identificar as estratégias empregadas pelas plantas para lidar com os desafios induzidos pelo Cd; e o conhecimento de tais estratégias pode ser potencialmente utilizado em programas biotecnológicos e de melhoramento genético. Deste modo, o conjunto de estudos que compõem a presente tese objetivou (i) identificar os principais mecanismos que suportam o grau de tolerância contrastante a toxicidade induzida por Cd em acessos de tomate após exposição a curto e longo prazos a este metal pesado; (ii) avaliar a relação entre o grau de tolerância e os atributos físico-químico de frutos oriundos de tomateiros cultivados em solo contendo Cd, e (iii) determinar os efeitos transgeracionais do estresse induzido por Cd. No primeiro experimento, nove acessos de tomateiro com graus variados de tolerância a exposição ao Cd, baseado na acumulação de biomassa, foram cultivados em solução hidropônica contendo 35 μM de CdCl2 durante 6 dias. O impedimento de elevada concentração de magnésio (Mg) em raízes foi identificado como possível estratégia da planta para mitigar a toxicidade de Cd, por meio da evitação da formação de pelos radiculares. Em relação ao modo de ação da toxicidade induzida por Cd, o excesso de Mn, em adição a elevada concentração de Cd, parece estar acoplado aos danos foliares que são acentuados ainda mais pelas altas concentrações de zinco (Zn) e boro (B) nos tecidos fotossintéticos de plantas sob exposição ao Cd. No segundo experimento, os genótipos tolerantes (Yoshimatsu) e sensíveis (Tropic Two Orders) foram cultivados em solo contendo Cd, a fim de avaliar os parâmetros de produção. O genótipo tolerante apresentou frutos com maior diâmetro, altura e peso após o cultivo em solo contendo Cd, quando comparado as plantas controle. Em ambas as cultivares, a concentração de Cd variou de acordo com a seguinte ordem descendente: raízes = folíolos> (receptáculo floral, pedúnculo e sépalas) > caule = casca de fruta = polpa de fruta. Alem disso, dados sugerem que o receptáculo floral e suas estruturas atuaram como uma barreira ao transporte de Cd para os frutos, entretanto, ela não foi suficiente para evitar que o Cd atingisse os frutos. Em adição, a exposição ao Cd provocou notáveis reduções na concentração de Mg nas raízes de genótipos sensíveis e tolerantes, revelando que a aclimatação das plantas depende do baixo status de Mg em tecidos radiculares. Desde que ambas as cultivares são capazes de empregar este mecanismo, os dados sugerem que, durante a exposição a curto prazo ao Cd, acessos tolerantes são capazes de ativa-lo ou mais cedo ou mais rápido do que acessos sensíveis. Ademais, efeitos transgeracionais positivos na germinação e vigor das sementes do genótipo tolerante foram desencadeados pelo cultivo planta-mãe em solo com Cd, apesar do aumento de anormalidades cromossômicas. Este trabalho reportou novos conhecimentos sobre os efeitos da exposição ao Cd sobre o desenvolvimento do tomateiro, mecanismos de tolerância, qualidade e rendimento de frutos, bem como a distribuição de Cd dentro da planta.
Mgobozi, Vuyokazi. "Heavy metal content absorption and medicinal potential of Egeria densa (Planch.) Casp." Thesis, University of Fort Hare, 2013. http://hdl.handle.net/10353/d1013121.
Повний текст джерелаKong, In-Chul. "The effects of heavy metals on anaerobic biotransformation reactions." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/25228.
Повний текст джерелаRessing, Sara Marlene. "Effects of heavy metals on two small mammal species." OpenSIUC, 2012. https://opensiuc.lib.siu.edu/theses/947.
Повний текст джерелаSchoeman, Werner. "Cellular stress responses to cadmium contamination as measure of sensitivity in intertidal molluscan species." Thesis, Link to the online version, 2007. http://hdl.handle.net/10019/460.
Повний текст джерелаAl-Ghamdi, H. S. H. H. "Studies on the effects of heavy metals on freshwater crustacea." Thesis, Swansea University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.635672.
Повний текст джерелаLinnane, Kevin. "The effects of heavy metals on marine algae - animal interactions." Thesis, University of Newcastle Upon Tyne, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.440576.
Повний текст джерелаMilton, Adrian Mark. "Heavy metals in contaminated grassland ecosystems : distribution, transfer and effects." Thesis, University of Liverpool, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266222.
Повний текст джерелаDay, A. D., B. B. Taylor, I. L. Pepper, and M. M. Minnich. "Effects of Sewage Sludge on Heavy Metals in Cotton Seed." College of Agriculture, University of Arizona (Tucson, AZ), 1988. http://hdl.handle.net/10150/204508.
Повний текст джерелаBraaf, Ryan. "Zirconium-induced physiological and biochemical responses in two genotypes of Brassica napus L." University of the Western Cape, 2015. http://hdl.handle.net/11394/4874.
Повний текст джерелаSouth Africa is one of two countries responsible for the production of approximately 80% of the world’s Zr. The increase in mining activity has detrimental effects on the environment, especially crop plants, as more pollutants are leached into the soil. Consequently, it is necessary to understand how plants respond to this form of abiotic stress. Therefore, this study focused on determining the physiological and biochemical responses of two genotypes of Brassica napus L (Agamax and Garnet) in response to Zr stress. The levels of cell death, lipid peroxidation and ROS were higher in Garnet, whereas the chlorophyll content was higher in Agamax. Furthermore, native PAGE analysis detected seven SOD isoforms and seven APX isoforms in Agamax, compared to 6 SOD isoforms and 7 APX isoforms in Garnet. The results thus indicate that Agamax is tolerant to Zr-induced stress, whereas Garnet is sensitive. An assay for the rapid quantification of Zr within plant samples was subsequently developed, which revealed that Agamax retained the bulk of the Zr within its roots, whereas Garnet translocated most of the Zr to its leaves. The ability of Agamax to sequester Zr in its roots comes forth as one of the mechanisms which confers greater tolerance to Zr-induced stress. As a consequence, our study sought to use the optical, physical and chemical properties of quantum dots to image the uptake and translocation of Zr in B. napus genotypes. ICPOES was also performed to quantify Zr levels in various plant organs. Data from the ICPOES revealed varying patterns of uptake and translocations between Garnet and Agamax. These patterns were similarly shown in IVIS Lumina images, tracing the transport of QD/Zr conjugates. This method ultimately proved to be successful in tracing the uptake of Zr, and could essentially be a useful tool for targeting and imaging a number of other molecules.
Aigbavbiere, Ernest. "The effects of heavy metals on denitification in a wetland sediment." Thesis, Linköping University, Department of Water and Environmental Studies, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-7884.
Повний текст джерелаWetlands water quality is influenced by the anthopogenic activities in the catchments’ areas. Wastewaters from the urban storm, agricultural runoff and sewage treatment often end up in wetlands before flowing to rivers, lakes and the sea. A lot of pollutants are readily transported in these wastewaters, thus subjecting the wetland ecosystem into a continuous resilience. Importantly, heavy metals like Cu, Zn, and Pb etc. are constituents of such pollutants in the wastewaters.
The study has as a specific objective to investigate the effects of heavy metal Cu, Zn and Pb on denitrification, an important ecosystem process and service. In a wetland situation, denitrification is a permanent nitrogen removal process accounting for about 90% of the total nitrogen removal.
The research was carried out in the laboratory and sediment samples were taken from a constructed wetland in Linkoping. We employed acetylene inhibition technique in obtaining N2O as a product resulting from nitrate reduction. The treatments (Cu, Zn and Pb) levels were 100 mg/kg, 250 mg/kg, 500 mg/kg and 1000 mg/kg of sediment, in three replicates and a control.
Samplings of the assay were taken within 24hours. Gas chromatography was used to analyse and quantify N2O in the various samples. A linear regression analysis was carried out with Windows Excel and SPSS to compare the various treatments with the control at 95% confidence level.
The results show that there were no inhibitions of denitrification at 100 mg/kg sediment treatment level for any of the element. Inhibition of denitrification was observed at treatment levels 500 mg/kg and 1000 mg/kg of sediment. The rate of nitrate reduction was compared from the slope of the regression curve. The rate for Cu at 500 mg and 1000 mg /kg of sediment was moderately related to that of the control, Zn shows a similar trend but a higher rate in some samples, while Pb shows more inhibition.
Yang, Shu. "Effects of heavy metals and phosphorus on nitrate removal in constructed wetlands." Thesis, Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-15550.
Повний текст джерелаFreeman, Emily K. "Effects of Dreissenid Mussel Druses on Heavy Metals Transfer via Benthic Macroinvertebrates." Bowling Green State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1372077038.
Повний текст джерелаTasneem, Sameera. "EFFECTS OF ENVIRONMENTAL HEAVY METALS ON NERUAL STEM CELL SURVIVAL AND DIFFERENTIATION." Cleveland State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=csu1400500632.
Повний текст джерелаLategan, Kim Leigh. "The in vitro effects of heavy metals and nanoparticles on the immune system." University of the Western Cape, 2017. http://hdl.handle.net/11394/6209.
Повний текст джерелаHeavy metals and nanoparticles may be released into the environment due to their use and applications. Sources of high, toxic metal concentrations may result from leachates from hazardous waste sites, discharge from industrial plants, and effluents from wastewater treatment plants being released into the environment. Nanoparticles may be found in a number of consumer products, and are used in medical applications such as drug delivery, bioimaging and biosensing. The release of heavy metals and nanoparticles to the environment may directly or indirectly impact abiotic and biotic systems. Three heavy metals and three nanoparticles were selected for this study. The heavy metals selected include cadmium (Cd), silver (Ag) and copper (Cu). The nanoparticles (NPs) chosen were silver nanoparicles (AgNPs), graphene oxide nanoparticles (GONPs) and carbon dots (CDs). These compounds were selected to evaluate the potential effects these compound may have on the immune system. The murine macrophage cell line RAW 264.7 and human whole blood cell cultures (WBCs) were selected as immune system representatives to assess the effects of heavy metals and nanoparticles on the immune system. The effects of heavy metals and NPs on RAW cells were monitored either in the absence or presence of the mitogen, lipopolysaccharide (LPS). The effects of heavy metals and NPs on WBCs were evaluated under basal conditions or in the presence of LPS or phytohaemmagglutinin (PHA). A number of parameters were monitored.
Coelho, Renato Ruas Pereira. "Effects of metals on the root-cell water relations of Vicia faba and Zea mays." Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388754.
Повний текст джерелаDe, Sa Paul Agnelo. "Effects of boundaries and impurities on critical systems." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282332.
Повний текст джерелаWoodcock, Thomas Stuart. "Effects of Roadway-Related Physical and Chemical Habitat Alterations on Stream Ecosystems." Fogler Library, University of Maine, 2002. http://www.library.umaine.edu/theses/pdf/WoodcockTS2002.pdf.
Повний текст джерелаKhara, Galvin. "Modelling the effects of swift heavy ion irradiation on metals and band gap materials." Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10054890/.
Повний текст джерелаDaka, Erema Ransome. "Population differences in the toxic effects of heavy metals to Littorina saxatilis olivi (prosobranchia: Mollusca)." Thesis, University of Liverpool, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320573.
Повний текст джерелаTorres, Eric M. "Microalgae Sorption of Ten Individual Heavy Metals and their Effects on Growth and Lipid Accumulation." DigitalCommons@USU, 2016. https://digitalcommons.usu.edu/etd/4956.
Повний текст джерелаMitchell, Kirsty. "The transfer of heavy metals through trophic levels and their toxicity effects on organisms including humans." Thesis, Nottingham Trent University, 2007. http://irep.ntu.ac.uk/id/eprint/215/.
Повний текст джерелаMahmoud, Huda Mahmoud Abdullah. "Structural and functional diversity of epilithic bacterial communities in streams : effects of pollution." Thesis, University of Hull, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271992.
Повний текст джерелаVenter, Chantelle. "An in ovo investigation of the cellular effects of the heavy metals cadmium and chromium alone and in combination." Diss., University of Pretoria, 2014. http://hdl.handle.net/2263/46019.
Повний текст джерелаDissertation (MSc)--University of Pretoria, 2014.
tm2015
Anatomy
MSc
Unrestricted
Arias, Jack A. "Symbiotic effects on the fungus Glomus Sp. on chromium(III), chromium(VI), and lead(II) uptake by mesquite (Prosopis Sp.) a novel method to remediate heavy metals /." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.
Повний текст джерелаArvapally, Ravi K. "Sensitization of Lanthanides and Organic-Based Phosphorescence via Energy Transfer and Heavy-Atom Effects." Thesis, University of North Texas, 2010. https://digital.library.unt.edu/ark:/67531/metadc28388/.
Повний текст джерелаAdijaya, Mardan. "The effects of humic water, heavy metals and parasitism on freshwater teleost fish in West Kalimantan, Indonesia." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ35466.pdf.
Повний текст джерелаKerrison, P. "Effects of low concentrations of heavy metals on plankton community dynamics in a small, fertile, freshwater lake." Thesis, University of East Anglia, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372349.
Повний текст джерелаAshworth, Daniel J. "The effects of dissolved organic matter on the behaviour of heavy metals in sewage sludge-amended soils." Thesis, University of Reading, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394419.
Повний текст джерелаMudre, John M. "An analysis of the contamination by and effects of highway- generated heavy metals on roadside stream ecosystems." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/49944.
Повний текст джерелаPh. D.
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Wong, Jayme Nicole. "Ecological Impacts of Mine Pollutants in Patagonia, Arizona: Studying the Effects of Heavy Metals on Aquatic Ecosystems." Thesis, The University of Arizona, 2015. http://hdl.handle.net/10150/578899.
Повний текст джерелаSalt, David Edward. "Copper-binding peptides of Mimulus guttatus." Thesis, University of Liverpool, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.291882.
Повний текст джерелаPrajzner, Scott P. "Effects of land use change on bee (Anthophila) community structure and function." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1480666062652755.
Повний текст джерелаLuce, Shelley Lynne. "Stress-induced mortality of juvenile Atlantic salmon (Salmo salar) due to accumulated effects of heavy metals and parasites." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq23847.pdf.
Повний текст джерелаChandar, Krishan. "The effects of heavy metals from past applications of sewage sludge on soil microbial biomass and miocrobial activity." Thesis, University of Reading, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293755.
Повний текст джерелаHowlett, Niall G. "The effects of altered membrane fatty acid composition on the toxic interactions of heavy metals with Saccharomyces cerevisiae." Thesis, Oxford Brookes University, 1998. https://radar.brookes.ac.uk/radar/items/ba46f6e3-f663-49af-9870-96fc8a28bc23/1/.
Повний текст джерелаÅkerblom, Staffan. "Anthropogenic heavy metals in organic forest soils : distribution, microbial risk assessment and Hg mobility /." Uppsala : Department of Environmental Assessment, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/200667.pdf.
Повний текст джерелаBhika, Akaashni Nareschandra. "An ex vivo erythrocyte study : the protective effects of antioxidants against the toxicity of heavy metals in cigarette smoke." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/65852.
Повний текст джерелаDissertation (MSc)--University of Pretoria, 2017.
Anatomy
MSc
Unrestricted
Udeozor, Jude Onyeka, and Jude Onyeka Udeozor. "Application of Industrial Wastewater Effluent in Growth of Algae -- Effects of Heavy Metals on the Growth Rate, Fatty Acid and Lipid Content of Chlorella Sorokiniana and Scenedesmus Obliquus." Thesis, The University of Arizona, 2017. http://hdl.handle.net/10150/626388.
Повний текст джерелаSimpson, Julia Marie. "Effects of heavy metal contamination on burial rates of Austrovenus stutchburyi implications for sediment transport /." The University of Waikato, 2009. http://hdl.handle.net/10289/2766.
Повний текст джерелаRind, Baloch Ali Hassan. "Studies on the effects of salinity and heavy metals on the sporophytic & gametophytic generations of Arabidopsis thaliana (L.) heynh." Thesis, Durham University, 1994. http://etheses.dur.ac.uk/5110/.
Повний текст джерелаVan, Look Katrien Jo Warda. "The development of sperm motility and morphological techniques for the assessment of the effects of heavy metals on fish reproduction." Thesis, University of Sheffield, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369940.
Повний текст джерелаHallman, Tyler Andrew. "RESPONSES OF HYLA CHRYSOSCELIS TO SUBLETHAL METAL MIXTURES UNDER INCREASING TEMPERATURES: IMPLICATIONS FOR THE EFFECTS OF CLIMATE CHANGE ON AMPHIBIANS." OpenSIUC, 2012. https://opensiuc.lib.siu.edu/theses/934.
Повний текст джерелаWong, Nga Cheung. "Effects of algae (Isochrysis galbana) and humic acids on copper toxicity to polychaete (Hydroides elegans) larvae." HKBU Institutional Repository, 2005. http://repository.hkbu.edu.hk/etd_ra/665.
Повний текст джерелаWu, Chuan. "Effects of radial oxygen loss (ROL) on arsenic tolerance, uptake and distribution by rice (Oryza sativa L.)." HKBU Institutional Repository, 2011. http://repository.hkbu.edu.hk/etd_ra/1246.
Повний текст джерелаLin, Yu-Chen, and 林語蓁. "Morphological and Physiological Effects of Heavy Metals on Thraustochytrids Isolated from Fallen Mangrove Leaves in Taiwan." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/41555724798456627018.
Повний текст джерела國立臺灣海洋大學
海洋生物研究所
97
Abstract The objectives of this thesis are: (1) to investigate the growth and morphological effects of increasing heavy metal stress on three strains of thraustochytrids isolated from fallen mangrove leaves collected in Kaohsiung Erjen river estuary, Tainan Yan-Tian ecological park mangrove and Miaoli Chu-Nan mangrove, caused by three heavy metals commonly exist in Taiwan’s metal-polluted river: copper, zinc and lead, and (2) to trace the fate of the selected heavy metal ions using atomic absorption spectrophotometer (AAS). Experiment on growth indicated that EC60 of Schizochytrium sp. EJ56 and Schizochytrium sp.CN75 was 64 ppm Zn2+, while EC60 of Schizochytrium sp.YT90 and Schizochytrium sp.CN75 was 128 ppm Cu2+ and EC60 of all strains was 512 ppm Pb2+. These results suggest that the toxicity of heavy metals on growth of thraustochytrids is in the order: Zn2+> Cu2+> Pb2+. Schizochytrium sp.CN75 was most tolerant to Cu2+ and Zn2+ while Schizochytrium sp.YT90 grew best in the presence of lead. Among all the isolates tested, Schizochytrium sp.CN75 was the most tolerant to the selected heavy metal ions. These suggest that thraustochytrids isolated from the river near the industry park (Schizochytrium sp.EJ56) may be more sensitive when facing to heavy metal stress. Observation of morphological changes on thraustochytrids under elevated heavy metal pressures under SEM (scanning electron microscope), heavy metals led to the formation of holes on cell wall, shrinkadge of cells and deformation of cell. At highest metal concentrations, cell lysis was observed and intracellular content leaked out. Under differential interference contrast microscope, perfectly round cells were observed in control and deformed cells were seen at the highest metal concentration. We detected heavy metal reduction by treating quantitative concentrations of heavy metals before and after thraustochytrids growing. The appearance of copper, zinc and lead reduction indicated that thraustochytrids can reduce in vitro heavy metals during their growth and the reduction rate was: Pb2+ > Zn2+ > Cu2+. The most significant reduction range were between 1 ppm and 256 ppm. The mechanism of heavy metal reduction by thraustochytrids remains unknow. We look forward follow-up studies to find out if the missing metals were adsorpted or absorpted by thraustochytrids, or both pathways contribute to the results. The results in the current study clearly shown that in the presence of high concentrations of heavy metal ions, growth of thraustochytrids would be retarded, eventually causing death. More effort should be done on the effects of heavy metal ions on the ecology of thraustochytrids, an important decomposer in marine environment.