Dissertations / Theses on the topic 'Speciation'
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Venditti, Christopher D. "Speciation and molecular evolution." Thesis, University of Reading, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493810.
Full textBranch, Simon. "Arsenic speciation in food." Thesis, University of Plymouth, 1990. http://hdl.handle.net/10026.1/2138.
Full textHurford, Simon Ronald. "Speciation and trace metals." Thesis, Cardiff University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.276927.
Full textChow, Stephanie S. Wold Barbara J. "Speciation in digital organisms /." Diss., Pasadena, Calif. : California Institute of Technology, 2005. http://resolver.caltech.edu/CaltechETD:etd-06062005-171257.
Full textPennings, Pleuni. "Models of adaptation and speciation." Diss., lmu, 2007. http://nbn-resolving.de/urn:nbn:de:bvb:19-66567.
Full textMontilla, Alfonso. "Sample treatment for arsenic speciation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0010/MQ60154.pdf.
Full textJarratt, Jason Aldrin. "Validation of chemical speciation models." Thesis, Manchester Metropolitan University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263802.
Full textMorrison, Gregory Mark. "Metal speciation in urban runoff." Thesis, Middlesex University, 1985. http://eprints.mdx.ac.uk/6559/.
Full textDean, Laura L. "Speciation in three-spined stickleback." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/52951/.
Full textYodle, Chan. "Iodine speciation in marine aerosol." Thesis, University of East Anglia, 2015. https://ueaeprints.uea.ac.uk/56772/.
Full textHawkes, Jeffrey Alistair. "Iron speciation in hydrothermal plumes." Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/359134/.
Full textIrwin, Darren E. "Ring speciation in Asian warblers /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2000. http://wwwlib.umi.com/cr/ucsd/fullcit?p9984301.
Full textSulaiman, Azli Bin. "New approaches to elemental speciation." Thesis, Loughborough University, 1996. https://dspace.lboro.ac.uk/2134/25760.
Full textHinojosa, Galisteo Joan Carles 1993. "Exploring the butterfly speciation continuum : A study on butterfly speciation in the transition to genomic techniques." Doctoral thesis, Universitat Pompeu Fabra, 2021. http://hdl.handle.net/10803/672348.
Full textLes papallones són un dels animals més ben estudiats però, malgrat els esforços dedicats a la seva recerca, el coneixement que tenim sobre la seva diversitat i sobre els mecanismes que la generen és encara incomplet. Per tal d'entendre com les papallones diversifiquen, s'ha examinat el continu de l'especiació en sis casos mitjançant l'ús de la morfometria i de diverses tècniques genètiques (des de la seqüenciació de marcadors específics fins a la genòmica). L'anàlisi de la variació fenotípica i genètica combinada amb evidències sobre el flux genètic ha permès identificar els estats del continu de l'especiació, i.e. l'estudi de les relacions entre poblacions. Aquesta aproximació s'ha usat com a marc (1) per fer hipòtesis taxonòmiques fonamentades i (2) per extreure pistes sobre els mecanismes que dirigeixen l'especiació. Com a resultat, hem descrit i proposat diversos casos de tàxons que havien passat desapercebuts o que s'havien dividit excessivament. Documentem l'existència de tres tipus de mecanismes productors de diversitat en papallones: deriva, selecció i hibridació. La selecció actuà mitjançant l'adaptació a factors ambientals biòtics, que causaren desplaçament de caràcters reproductius, canvi de planta nutrícia i a\ll ocronia produïda per l'adaptació al període de floració de la planta nutrícia. Addicionalment, les tècniques genètiques emprades són avaluades i els seus avantatges i inconvenients discutits.
Hlinka, Vojtech. "Genetic speciation of archaeological fish bones /." St. Lucia, Qld, 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17168.pdf.
Full textSmith, D. Scott. "Metal speciation determined using multiresponse fluorescence." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0030/NQ66237.pdf.
Full textMatni, Gisèle. "Speciation of selenium in food supplements." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40393.
Full textSelective isolation and HPLC-AAS protocols were also developed and optimized for the determination of free organic forms e.g. selenomethionine (SeMet), selenocystine (SeCystine) and inorganic forms of selenium in aqueous solutions, and in complex matrices such as nutritional supplements and mixtures of free amino acids. The selenoamino acid in alkaline solution was first derivatized with 1-fluoro-2,4-dinitrobenzene. After removal of excess of reagent by partitioning with diethyl ether, the N-dinitrophenyl (DNP)-derivatized selenoamino acid was acidified and extracted with diethyl ether. Inorganic Se(IV) was extracted from the acidic aqueous phases by complexation with 1,2-phenylenediamine, forming a piazselenol. Se derivatives were determined selectively by HPLC-THG-AAS. A selective chromatographic mechanism based on $ pi$-electron interactions was optimized using a silica stationary phase derivatized with p-nitrophenyl moieties. Co-injections of DNP-SeMet, DNP-SeCystine and piazselenol save retention times of 3.7, 4.0 and 4.9 min, respectively, using a methanolic mobile phase containing 1.5% triethylamine and 0.013M acetic acid. Primary analytical validation parameters including stability, linearity and limits of detection were obtained using purified DNP-SeMet, DNP-SeCystine and piazselenol standards which were characterized by $ sp1$H-, $ sp{13}$C- and $ sp{77}$Se-NMR analysis and/or fast atom bombardment MS techniques. The calibration graphs for sequential dilutions of these Se standards were linear and the limits of detection from the resultant calibration graphs were 17 ng, 0.21 ng and 18.53 ng of Se, respectively. The purified DNP-SeMet and DNP-SeCystine were found to be photosensitive. The recovery of SeMet, SeCystine and inorganic Se from the stock solutions and/or nutritional supplements was virtually quantitative. In the presence of a 500-fold excess of other amino acids, the recovery of SeMet and SeCystine (96.1 $ pm$ 3.9% and 98.08 $ pm$ 4.2%, respec
Dundar, Mustafa Sahin. "Speciation studies on dietary trace elements." Thesis, University of Hull, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337335.
Full textRosser, N. S. "Speciation and biogeography of heliconiine butterflies." Thesis, University College London (University of London), 2013. http://discovery.ucl.ac.uk/1386054/.
Full textMcKenzie, Andy. "Stochastic speciation models for evolutionary trees." Thesis, University of Canterbury. Mathematics and Statistics, 2000. http://hdl.handle.net/10092/5597.
Full textSimpson, Stuart L. "Speciation of aluminium in environmental systems." Thesis, University of Canterbury. Chemistry, 1996. http://hdl.handle.net/10092/6704.
Full textHilscher, Rainer. "Agent based models of competitive speciation." Thesis, University of Sussex, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413887.
Full textFindlow, James Andrew. "Chemical speciation of aluminium in milk." Thesis, Cardiff University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329705.
Full textBull, Vanessa Jane. "Genealogy and speciation in Heliconius butterflies." Thesis, University College London (University of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408421.
Full textAchterberg, Eric Pieter. "Trace metal speciation in natural waters." Thesis, University of Liverpool, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359194.
Full textHayward, John. "Models of speciation by sexual selection." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364220.
Full textAborode, Fatai Adigun. "Selenium and arsenic speciation in plants." Thesis, University of Aberdeen, 2013. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=201647.
Full textLum, Tsz Shan. "Elemental imaging and speciation for bioanalysis." HKBU Institutional Repository, 2016. https://repository.hkbu.edu.hk/etd_oa/328.
Full textDerbyshire, Michelle. "Speciation of chromium in environmental matrices." Thesis, Sheffield Hallam University, 2001. http://shura.shu.ac.uk/19556/.
Full textShaw, Philip Neil. "Studies on cobalt speciation in groundwaters." Thesis, Loughborough University, 1990. https://dspace.lboro.ac.uk/2134/32076.
Full textKim, Dae Ji. "Tritium speciation in nuclear decommissioning materials." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/72145/.
Full textTabatchnick, Melissa Danielle. "Mercury Speciation in Temperate Tree Foliage." Wright State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=wright1284516685.
Full textPapadopulos, Alexander Savas Thomas. "Plant speciation on Lord Howe Island." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/7069.
Full textFitzpatrick, Benjamin Minault. "Speciation and barriers to gene flow /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2004. http://uclibs.org/PID/11984.
Full textEbuele, Victor Pghogho. "Phosphorus speciation in soil and plants." Thesis, Bangor University, 2016. https://research.bangor.ac.uk/portal/en/theses/phosphorus-speciation-in-soil-and-plants(c9a2b08e-cca7-48ad-ac49-79b772d17602).html.
Full textHilgenböcker, Kirsten. "Wolbachia's role in classical speciation theory." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2009. http://dx.doi.org/10.18452/16020.
Full textWolbachia are intracellular bacteria that commonly infect arthropod species. Since they often induce a cytoplasmic mating incompatibility (CI) in their hosts that acts as a postzygotic isolating mechanism between differently infected individuals of one species, Wolbachia have received attention as a potential promoter of arthropod speciation processes. Previous studies on speciation focused on either Wolbachia-induced or the classical nuclear-based postzygotic isolating mechanism. However, it should usually be the case that both co-occur. This thesis continues investigations on Wolbachia''s role in speciation by analyzing interactions of Wolbachia-induced CI and nuclear incompatibility (NI) caused by genetic differentiation. We will show that Wolbachia have strong impact on nuclear-based speciation processes. In particular, synergy effects can occur when both isolating mechanisms act simultaneously. Furthermore, we show that Wolbachia can influence speciation processes under more general conditions than previous studies on Wolbachia''s role in speciation suggested. Since the actual role of Wolbachia in arthropod speciation will strongly depend on their abundance, we present a statistical meta-analysis of published data on Wolbachia infection frequencies. Due to the sampling methods applied in studies on Wolbachia infection frequencies, it is likely that current estimates of 20% infected species are underestimates. This is supported by our analysis and we show that more likely about two-thirds of species are infected. Combining both results, this thesis provides strong evidence for Wolbachia being a very general factor in arthropod speciation processes.
Georgiadis, Myron. "Arsenic Speciation in Soils and Sediments." FIU Digital Commons, 2004. https://digitalcommons.fiu.edu/etd/3579.
Full textPeñalba, Joshua Villapa. "Speciation Genomics in Australian Meliphagoid Birds." Phd thesis, Canberra, ACT : The Australian National University, 2017. http://hdl.handle.net/1885/141395.
Full textHatchett, William. "The road toward sympatric speciation in whitefish. : The effects of divergent selection on European whitefish (Coregonus lavaretus) size and behavior, and effects on zooplankton communities." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-110741.
Full textParler, Nichole Erin. "Mercury concentration and speciation in coastal rainwater /." Electronic version (PDF), 2005. http://dl.uncw.edu/etd/2005/parlern/nicholeparler.html.
Full textOzato, Kenjiro. "Mutagenesis, speciation, and genome analysis in medaka." Laboratory of Freshwater Fish Stocks Bioscience Center Nagoya University, 1994. http://hdl.handle.net/2237/13793.
Full textHasegawa, Hiroshi. "Seasonal Changes in Arsenic Speciation in Hydrosphere." 京都大学 (Kyoto University), 1997. http://hdl.handle.net/2433/202482.
Full textEdwards, Danielle L. "Biogeography and speciation of southwestern Australian frogs." University of Western Australia. School of Animal Biology, 2007. http://theses.library.uwa.edu.au/adt-WU2008.0058.
Full textWang, Hongjun. "Labile speciation studies using electrospray mass spectrometry." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ37657.pdf.
Full textAdams, Nicholas. "Chemical speciation of silver(I) in freshwater." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0027/NQ50978.pdf.
Full textGelting, Johan. "Trace metal speciation in the Baltic sea." Licentiate thesis, Luleå : Luleå tekniska universitet/Tillämpad kemi och geovetenskap/Tillämpad geologi, 2006. http://epubl.ltu.se/1402-1757/2006/74/LTU-LIC-0674-SE.pdf.
Full textJianping, Lin. "Iodine speciation in the Yarra River estuary /." Connect to thesis, 1992. http://eprints.unimelb.edu.au/archive/00000216.
Full textPadmavathiamma, Prabha Kumari. "Phytoremediation and metal speciation in highway soils." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/23479.
Full textBryan, Stephen Edward. "Testing models of chemical speciation n freshwaters." Thesis, Lancaster University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249809.
Full textLofts, Stephen. "Modelling chemical speciation in the natural environment." Thesis, Lancaster University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421627.
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