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Kleinot, Jacqueline. "Interactions of radionuclides with estuarine sediments". Thesis, Imperial College London, 1994. http://hdl.handle.net/10044/1/8485.
Pełny tekst źródłaLee, Chang-Hee. "Resuspension behavior of natural estuarine sediments". W&M ScholarWorks, 1995. https://scholarworks.wm.edu/etd/1539616734.
Pełny tekst źródłaSaid, Gisele Witt 1988. "Ecotoxicidade associada à contaminação por metais em sedimento no Rio Morrão, sistema estuarino de Santos-Cubatão, SP". [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/286627.
Pełny tekst źródłaDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Geociências
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Resumo: O sedimento representa um importante compartimento na avaliação do nível de contaminação dos ecossistemas aquáticos, pois nele é possível observar o acúmulo e a integração de muitos contaminantes presentes. O sistema estuarino de Santos-Cubatão (SP) tem sido apontado como um ambiente sedimentar seriamente poluído, devido à emissão descontrolada de efluentes urbanos e industriais. Neste sistema, o rio Morrão (foco deste estudo) tem sofrido, em particular, o impacto de atividades nos últimos 60 anos de indústria de fertilizantes e siderurgia. Com o objetivo de avaliar a qualidade dos sedimentos deste ambiente, estudos da toxicidade e biodisponibilidade de alguns contaminantes e caracterização físico-química foram realizados durante a estação seca, em amostras coletadas ao longo da borda do manguezal. Na avaliação, vários parâmetros ambientais foram levantados, incluindo: determinação de monossulfetos volatilizáveis por acidificação (AVS) e metais simultaneamente extraídos (SEM); granulometria (caracterização da textura) e matéria orgânica (MO) dos sedimentos; análise da concentração total dos elementos químicos; e aplicação de testes ecotoxicológicos agudo (utilizando-se Tiburonella viscana) e crônico (copépodes Nitocra sp). Os resultados obtidos apresentaram sedimentos com a fração silte dominante (>60% do volume das amostras) e a MO mostrou valores entre 9,15% e 22,3%. O AVS apresentou concentrações entre 0,43 e 41,38 µmol g?1 nos pontos amostrados e SEM entre 0,48 a 7,02 µmol g?1, sugerindo que efeitos adversos nos organismos expostos não seriam potencialmente esperados na área de estudo. Contudo, testes com os organismos vivos revelaram toxicidade aguda em alguns pontos, enquanto a toxicidade crônica foi evidente em todos os pontos amostrados. O método SEM/AVS indicou que pelo menos três pontos da área de estudo poderiam ser tóxicos. Em geral, a toxicidade crônica identificada nos testes biológicos não foi corroborada pela relação SEM/AVS, cuja concentração molar de metais potencialmente tóxicos (extração com HCl 6 M) foi inferior à concentração molar de monossulfetos que normalmente funcionam como ligantes destes metais nos sedimentos. Porém para a toxicidade aguda, a relação SEM/AVS mostrou concordância em 5 das 8 amostras testadas, o que sugere um poder razoável do método SEM/AVS para prever este tipo de toxicidade. Isso indica que quanto maior a disponibilidade de sítios de sulfetos para aprisionamento dos metais lábeis, menor a toxicidade aguda observada. Por outro lado, a comparação das concentrações de metais totais (e.g. Cd, Cr, Cu, Hg, Ni, Pb e Zn) com o nível de referência de contaminação (Nível 1) proposto por CONAMA 454 sugere que 7 dos 8 sedimentos são potencialmente tóxicos. Este aspecto mostrou alta concordância com a toxicidade crônica identificada. Comportamento assim revela que os efeitos crônicos possivelmente possuem relação com o fato de que os copépodos usados no estudo podem se expor e sofrer os efeitos adversos dos metais possivelmente mais solúveis na água intersticial dos sedimentos testados. Adicionalmente, a ingestão do próprio sedimento por estes organismos é outro aspecto a ser considerado. Os resultados deste estudo revelam que o método SEM/AVS prevê razoavelmente a toxicidade aguda, enquanto a excedência de Nível 1 segundo CONAMA 454 (2012) prevê muito bem toxicidade crônica dos sedimentos
Abstract: Sediments represent an important compartment to assess contamination levels of aquatic ecosystems, because it is possible to observe the accumulation and the integration of a variety of contaminants in them. The Santos-Cubatão Estuarine System (São Paulo Estate ¿ Brazil) has been pointed out as a severely polluted sedimentary environment due to the uncontrolled emission of urban and industrial effluents. Particularly in this system, the Morrão River (object of this study) has undergone the impact of activities related to fertilizers and iron industries in the last 60 years. Aiming at evaluating the quality of the sediments in this environment, a study of the toxicity and bioavailability of some contaminants and a physical-chemical characterization were carried out during the dry season, by means of sampling along mangrove margins. Several environmental parameters were assessed, including: concentrations of acid volatile monosulfides (AVS) and simultaneously extracted metals (SEM); grain size (texture characterization) and organic matter content (MO); analysis of the total chemical element concentration; and the application of acute (using Tiburonella viscana) and chronic (copepod Nitocra sp) ecotoxicity tests. The results revealed that the silt fraction is dominant in the sediments (>60% sample volume) and that MO contents range from 9.15% and 22.3%. The AVS showed concentrations between 0.43 and 41.38 µmol g?1 in the sampled points and SEM between 0.48 and 7.02 µmol g?1, suggesting that adverse effects would not be potentially expected in exposed organisms in the study area. However, tests with living organisms revealed acute toxicity in some points, whereas chronic toxicity was evident in all sampled points. The SEM/AVS method indicated that at least three points of the study area could be toxic. In general, chronic toxicity identified in the biological tests was not corroborated by the SEM/AVS ratio, once the molar concentration of potentially toxic metals (HCl 6 M extraction) was lower than the molar concentration of monosulfides that usually act as bonding agents. For the acute toxicity, the SEM/AVS ratio was concordant in 5 out of the 8 tested samples, which suggests a reasonable efficiency of the SEM/AVS method to predict this type of toxicity. The higher the availability of sulfide sites is for trapping of labile metals, the lower the acute toxicity observed. On the other hand, the comparison of the total metal concentrations (e.g. Cd, Cr, Cu, Hg, Ni, Pb and Zn) with the contamination level reference (Level 1) proposed by CONAMA 454 indicates that 7 out of the 8 sediment samples are potentially toxic. This aspect is highly concordant with the chronic toxicity identified in the study area. Such behavior reveals that the chronic effects are possibly related to the fact that the copepods used in the study can expose themselves and undergo the adverse effects of the metals that are possibly more soluble in the sediment interstitial water. Additionally, the ingestion of the sediment itself by these organisms is another aspect to be considered. The results of this study reveal that the SEM/AVS method reasonably predicts acute toxicity, whereas chronic toxicity is well assessed by contents exceeding Level 1 values
Mestrado
Geologia e Recursos Naturais
Mestra em Geociências
Ramachandran, Shahunthala Devi. "Toxicity associated with sediments from Malaysian estuarine environment". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq23170.pdf.
Pełny tekst źródłaReay, William Glendon. "Estuarine sediment nutrient exchange : the importance of physical transport mechanisms and benthic micro-communities /". Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-07122007-103937/.
Pełny tekst źródłaRaymundo, Cristina Coelho. "Linear alklbenzenes in marine and estuarine sediments". Thesis, University of Liverpool, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317231.
Pełny tekst źródłaYeh, Chen-Ying. "The biogeochemistry of dimethylsulphoniopropionate in estuarine sediments". Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327256.
Pełny tekst źródłaPrastka, Katherine. "Phosphorus cycling in intertidal sediments". Thesis, University of East Anglia, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320776.
Pełny tekst źródłaBerno, Ludimila 1980. "Sazonalidade geoquímica multi-elementar em diferentes frações granulométricas de sedimentos do sistema estuariano de Santos - Cubatão/SP". [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/287640.
Pełny tekst źródłaDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Geociências
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Resumo: O sistema estuarino de Santos-Cubatão (SP) está localizado em uma das áreas mais industrializadas da América Latina. Os estuários são ambientes de grande complexidade, onde ocorrem interrelações entre componentes geológicos, físicos, biológicos e químicos. O histórico de contaminação desse ambiente estuarino, decorrente de diferentes atividades antrópicas, pode resultar em altos níveis de contaminação, e os sedimentos podem representar uma fonte latente de elementos-traço para o ambiente aquático. Com o objetivo de investigar a variabilidade geoquímica sazonal de elementos-traço, os sedimentos de superfície dos principais rios deste sistema estuarino (Casqueiro, Cubatão, Cascalho, Morrão e Capivari) foram amostrados no inverno e no verão. Concentrações químicas multi-elementares em diferentes granulometrias (<63 mm, <177 mm e total), obtidas por ICP-MS, e os níveis de matéria orgânica foram relacionados. As texturas dos sedimentos estudados apresentaram característica silto-argilosa (64 a 87%). Os maiores níveis de matéria orgânica foram encontrados nos sedimentos do rio Morrão (10,92 a 12,05%), porém não foi observada relação com a granulometria. Em geral, os metais e metalóides foram mais concentrados na textura silto-argilosa, mas isso não foi sistemático para todo o ambiente. Considerando fatores de enriquecimento, anomalias geoquímicas foram encontradas para os elementos Be, Bi, Ca, Co, Cu, Cd, Cr, Fe, Hf, Hg, Mn, Ni, Nb, P, Pb, Sb, Sr, Ta, Th, U, Y, Zn e Zr especialmente no rio Morrão. Com exceção do rio Capivari, o Hg e o P foram os únicos elementos que se apresentaram anômalos nos demais rios investigados. Elementos como Al, As, Cs, K, Li, Mg, Na, Rb, S, Ti e V apresentaram comportamento geogênico ao longo de todo o ambiente deste estudo. A sazonalidade geoquímica foi notificada claramente nos sedimentos do rio Morrão e parece não ocorrer para a maioria dos elementos tratados nos demais rios investigados. Em geral, foi observado um maior enriquecimento dos elementos contaminantes durante o verão, provocando uma diminuição relativa dos elementos geogênicos nesta estação. O contrário ocorreu durante o inverno. Este trabalho mostrou que o incremento nos níveis de contaminação favorece a flutuação sazonal das concentrações de elementos nos sedimentos. Possivelmente, a sazonalidade associada aos elementos contaminantes pode estar ligada ao fato de estes elementos ocuparem posições mais instáveis em fases minerais e não-minerais do ambiente sedimentar. Isso possibilita uma maior mobilização da carga de elementos contaminantes em função das variações das condições físicas e/ou químicas do meio (pH, Eh, salinidade), se comparada aos elementos geogênicos mais estáveis no ambiente.
Abstract: The Santos-Cubatão estuarine system (SP) is located in one of the most industrial areas in Latin America. Estuaries are environments of great complexity where there is an interrelation among geological, physical, biological, and chemical compounds. The contamination history at this environment is a result of different anthropic activities which can be high, and the sediments can represent a significant source of trace elements to aquatic environment. By investigating the seasonal geochemical range of trace elements, the surface sediments of the main rivers from this estuarine system (Casqueiro, Cubatão, Cascalho, Morrão, and Capivari) were sampled in the winter and summer. Multi-elemental chemical concentrations in different grain-size (<63 mm, <177 mm and total), gotten by ICP-MS, and the organic matter level were related. The texture of the studied sediments presented silt-clay characteristics (64 to 87%). The highest levels of organic matter were found in the sediments of Morrão River (10.92 to 12.05%), however, no direct relation with the grain-size. In general, the metals and metalloids were more concentrated in the siltclay texture, but it was not systematic to the entire estuary. Regarding enrichment factors, geochemical anomalies were found to the following elements Be, Bi, Ca, Co, Cu, Cd, Cr, Fe, Hf, Hg, Mn, Ni, Nb, P, Pb, Sb, Sr, Ta, Th, U, Y, Zn, and Zr, mainly in Morrão River. The only elements that were presented anomalous in every river studied, except in Capivari River, were Hg and P. Elements as Al, As, Cs, K, Li, Mg, Na, Rb, S, Ti, and V presented geogenic behavior all along the environment of this study. The geochemical seasonality was clearly seen in the sediments of Morrão River, but not conclusive to most elements in the other rivers. In general, it was observed a higher enrichment of contaminant elements during the summer, causing a relatively decrease of geogenic elements in that season. However, the opposite happened during the winter. This work shows that the increment in the contamination level contributes to the seasonal fluctuation of the element concentrations in the sediments (e.g. Morrão River). The seasonality associated to the contaminant elements can be regarded to the fact that these elements occupy more unstable positions in mineral and non-mineral phases of the sedimentary environment, leading to a great mobilization of contaminant elements load caused by the physical and/or chemical range of conditions of the environment (mainly, pH, Eh and salinity), when compared to the more stable geogenic elements in the environment.
Mestrado
Geologia e Recursos Naturais
Mestre em Geociências
Stoddard, Daniel Mark. "Evaluation of sediment trap efficiency in an estuarine environment". Thesis, Springfield, Va. : Available from National Technical Information Service, 2001. http://handle.dtic.mil/100.2/ADA403559.
Pełny tekst źródłaCantwell, Mark G. "Mobility and fate of contaminants in estuarine environments /". View online ; access limited to URI, 2006. http://0-digitalcommons.uri.edu.helin.uri.edu/dissertations/AAI3248226.
Pełny tekst źródłaJespersen, Jennifer L. "Organic Carbon in the Subaqueous Soils of a Mesotidal Maine Estuary: An Investigation of Quantity and Source". Fogler Library, University of Maine, 2006. http://www.library.umaine.edu/theses/pdf/JespersenJL2006.pdf.
Pełny tekst źródłaBell, Emma. "Heat resistant thermophilic endospores in cold estuarine sediments". Thesis, University of Newcastle upon Tyne, 2016. http://hdl.handle.net/10443/3207.
Pełny tekst źródłaOsborne, Kate Amy. "Environmental controls on bacteriohopanepolyol signatures in estuarine sediments". Thesis, University of Newcastle upon Tyne, 2016. http://hdl.handle.net/10443/3214.
Pełny tekst źródłaEdgar, Petrena Joyce. "Biogeochemistry of polychlorinated biphenyls (PCBs) in estuarine sediments". Thesis, University of the West of Scotland, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343348.
Pełny tekst źródłaFarr, Katherine Mary. "Palynomorph and palynodebris distributions in modern estuarine sediments". Thesis, University of Aberdeen, 1988. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU020378.
Pełny tekst źródłaThatcher, Lisa A. "Carbon remineralization and storage in estuarine wetland sediments /". Electronic version (PDF), 2005. http://dl.uncw.edu/etd/2005/thatcherl/lisathatcher.pdf.
Pełny tekst źródłaSoomro, Saeed Ahmed. "Detection of saline intrusions in coastal and estuarine sediments". Thesis, Bangor University, 1993. https://research.bangor.ac.uk/portal/en/theses/detection-of-saline-intrusions-in-coastal-and-estuarine-sediments(8f00d68f-bbf6-4b63-b260-f190c054adf2).html.
Pełny tekst źródłaMitra, Siddhartha. "Polycyclic aromatic hydrocarbon (PAH) distributions within urban estuarine sediments". W&M ScholarWorks, 1997. https://scholarworks.wm.edu/etd/1539616779.
Pełny tekst źródłaYang, Meng. "Historical changes in heavy metals in the Yangtze Estuary". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ61961.pdf.
Pełny tekst źródłaLewis, Mary Gwendolyn. "Diatoms as indicators of estuarine palaeoenvironments". Thesis, University of Newcastle Upon Tyne, 2001. http://hdl.handle.net/10443/565.
Pełny tekst źródłaWilliams, Mark Steven. "Radionuclides as tracers of sediment mixing in natural and enclosed estuaries". Thesis, University of Plymouth, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247510.
Pełny tekst źródłaFord, Kathryn Hale. "Assessment of the Rhode Island coastal lagoon ecosystem /". View online ; access limited to URI, 2003. http://0-wwwlib.umi.com.helin.uri.edu/dissertations/dlnow/3115628.
Pełny tekst źródłaHubeny, Jeremiah Bradford. "Late Holocene climate variability as preserved in high-resolution estuarine and lacustrine sediment archives /". View online ; access limited to URI, 2006. http://0-wwwlib.umi.com.helin.uri.edu/dissertations/fullcit/3239909.
Pełny tekst źródłaAganbi, Eferhire. "Investigation of aromatic hydrocarbon biodegradation in estuarine and aquifer sediments". Thesis, University of Essex, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.446009.
Pełny tekst źródłaMazik, Krystina. "The influence of a petrochemical discharge on the bioturbation and erosion potential of an intertidal estuarine mudflat (Humber estuary, UK)". Thesis, University of Hull, 2004. http://hydra.hull.ac.uk/resources/hull:7047.
Pełny tekst źródłaWyness, Adam James. "The influence of sediment characteristics on the abundance and distribution of E. coli in estuarine sediments". Thesis, University of St Andrews, 2017. http://hdl.handle.net/10023/10158.
Pełny tekst źródłaChariton, Anthony A., i n/a. "Responses in estuarine macrobenthic invertebrate assemblages to trace metal contaminated sediments". University of Canberra. Resource, Environmental & Heritage Sciences, 2005. http://erl.canberra.edu.au./public/adt-AUC20060509.115744.
Pełny tekst źródłaManning, Andrew James. "Study of the effect of turbulence on the properties of flocculated mud". Thesis, University of Plymouth, 2001. http://hdl.handle.net/10026.1/491.
Pełny tekst źródłaGess, Peter L. "Release of chlorinated organic compounds from a contaminiated estuarine sediment". Thesis, Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/20302.
Pełny tekst źródłaNichol, Scott L. (Scott Lawrence). "Sedimentology of two wave-dominated, incised valley estuaries, New South Wales south coast". Thesis, Department of Geography, 1992. http://hdl.handle.net/2123/8918.
Pełny tekst źródłaBurton, Edward D., i n/a. "Distribution and Partitioning of Trace Metals and Tributyltin in Estuarine Sediments". Griffith University. School of Environmental Engineering, 2005. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20050830.161359.
Pełny tekst źródłaOates, Holly G. "Molecular determination of arsenate respiring bacteria in estuarine sediments and groundwater /". Electronic version (PDF), 2007. http://dl.uncw.edu/etd/2007-2/r1/oatesh/hollyoates.pdf.
Pełny tekst źródłaPrytula, Mark Taras. "Bioavailability and microbial dehalogenation of chlorinated benzenes sorbed to estuarine sediments". Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/32835.
Pełny tekst źródłaBurton, Edward. "Distribution and Partitioning of Trace Metals and Tributyltin in Estuarine Sediments". Thesis, Griffith University, 2005. http://hdl.handle.net/10072/366133.
Pełny tekst źródłaThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Environmental Engineering
Full Text
Perkins, Tracy. "The role of estuarine sediments as a reservoir for pathogenic microorganisms". Thesis, Bangor University, 2015. https://research.bangor.ac.uk/portal/en/theses/the-role-of-estuarine-sediments-as-a-reservoir-for-pathogenic-microorganisms(3683144c-e7f1-4753-8749-72f3e0378935).html.
Pełny tekst źródłaGundersen, Jennifer Lisa. "Acid dissociation of chloroguaiacols and pH dependent sorption to estuarine sediments". W&M ScholarWorks, 1995. https://scholarworks.wm.edu/etd/1539616676.
Pełny tekst źródłaGuan, Weibing. "Transport and deposition of high-concentration suspensions of cohesive sediment in a macrotidal estuary /". View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?MECH%202003%20GUAN.
Pełny tekst źródłaIncludes bibliographical references (leaves 174-185). Also available in electronic version. Access restricted to campus users.
Gilmour, Fiona Louise. "The effect of salinity and ammonia on nitirifier function and distribution in estuarine sediments". Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=59375.
Pełny tekst źródłaAlgan, A. Oya. "Sedimentology and geochemistry of fine-grained sediments in the Solent Estuarine System". Thesis, University of Southampton, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241246.
Pełny tekst źródłaCundy, Andrew Brian. "Radionuclide and geochemical studies of recent sediments from the Solent estuarine system". Thesis, University of Southampton, 1994. https://eprints.soton.ac.uk/50591/.
Pełny tekst źródłaJarvis, Brandon Michael. "Effects of organic carbon loading on coupled nitrification/denitrification in estuarine sediments". [Pensacola, Fla.] : University of West Florida, 2008. http://purl.fcla.edu/fcla/etd/WFE0000137.
Pełny tekst źródłaMohd, Abdullah Maizah. "Ecological Studies of the Mangrove-Associated Meiofauna in Southeast Queensland, Australia". Thesis, Griffith University, 2016. http://hdl.handle.net/10072/367507.
Pełny tekst źródłaThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Environment
Science, Environment, Engineering and Technology
Full Text
Heil, Clifford William. "Paleo-and environmental magnetic studies of late Cenozoic estuarine, lacustrine, and terrestrial sediments /". View online ; access limited to URI, 2008. http://0-digitalcommons.uri.edu.helin.uri.edu/dissertations/AAI3314457.
Pełny tekst źródłaVinson, Joshua S. "Role of oxygen and salinity on biogeochemical processes controlling mercury and monomethylmercury flux from estuarine sediments". View electronic thesis, 2008. http://dl.uncw.edu/etd/2008-2/r1/vinsonj/joshuavinson.pdf.
Pełny tekst źródłaThomson, Heather. "Controls on the sulfur cycle in estuarine sediments on the Central Texas coast". [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1834.
Pełny tekst źródłaReid, Miriam Katherine. "An Investigation of the Spatial Distribution and Partitioning of Metals in Estuarine Sediments". Thesis, Queen Mary, University of London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.499283.
Pełny tekst źródłaSage, Andrew Stephen. "Removal of nitrate from estuarine water and its reduction in the bottom sediments". Thesis, University of Essex, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295648.
Pełny tekst źródłaMeiggs, Deidre Janelle. "Development of autonomous in situ techniques to examine the impacts of dynamic forcings on sediment biogeochemistry in highly productive estuarine ecosystems". Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37078.
Pełny tekst źródłaKlosterhaus, Susan L. "The bioavailability of brominated diphenyl ethers from urban estuarine sediments to deposit-feeding invertebrates". College Park, Md. : University of Maryland, 2007. http://hdl.handle.net/1903/6767.
Pełny tekst źródłaThesis research directed by: Marine-Estuarine-Environmental Sciences. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.