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Dissertations / Theses on the topic 'Extinction'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Breazeale, Dorothy Elizabeth. "Extinction Events." Bowling Green State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1427876606.

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2

Powell, Eileen A. "Extinction of experience." Connect to this title online, 2007. http://etd.lib.clemson.edu/documents/1181666217/.

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3

Plendl, Wolfgang. "Extinction learning in mice." Diss., lmu, 2010. http://nbn-resolving.de/urn:nbn:de:bvb:19-121216.

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4

Золотова, Світлана Григорівна, Светлана Григорьевна Золотова, Svitlana Hryhorivna Zolotova, and S. O. Gordienko. "The extinction of species." Thesis, Вид-во СумДУ, 2007. http://essuir.sumdu.edu.ua/handle/123456789/17567.

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Massive extinctions have occurred five times during the earth's history, the last one was the extinction of the dinosaurs, 65 million years ago. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/17567
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5

Vurbic, Drina. "Mechanisms of Secondary Extinction." ScholarWorks @ UVM, 2010. http://scholarworks.uvm.edu/graddis/237.

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Pavlov (1927) first reported that following appetitive conditioning of multiple stimuli, extinction of one CS attenuated responding to others which had not undergone direct extinction. Four experiments with rat subjects investigated potential mechanisms of this secondary extinction effect. Experiment 1 assessed whether secondary extinction would be more likely to occur with target CSs that have themselves undergone some prior extinction. Two CSs were initially paired with shock. One CS was subsequently extinguished before the second CS was tested. The target CS was partially extinguished
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6

Winer, Daniel H. "The development and meaning of firefighting, 1650-1850." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 351 p, 2009. http://proquest.umi.com/pqdweb?did=1833647391&sid=8&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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7

Barnard, Linda L. "The Effects of Conditioned Reinforcers on Extinction When Delivered on Schedules of Extinction." DigitalCommons@USU, 1990. https://digitalcommons.usu.edu/etd/5985.

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The purpose of the present research was to examine extinction of responding with regard to the rapidity and thoroughness of the process when conditioned reinforcement was available on one of five schedules during extinction. Forty-five mixed-breed pigeons served as subjects with 15 in each of three experiments. Reinforcement training schedules were as follows: Experiment 1, continuous; Experiment 2, fixed ratio 15; Experiment 3, variable-interval one-minute. After training, subjects experienced one of five extinction procedures (here called schedules of extinction) which were as follows: tradi
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8

Gabriele, Amanda. "Multiple memory systems and extinction." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2384.

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Several lines of evidence suggest that initial acquisition of learned behavior involves multiple memory systems. In particular, lesions of the hippocampus impair the acquisition of cognitive or relational memory, but do not impair the acquisition of stimulus-response habits. Extinction behavior also involves new learning, and therefore it is possible that multiple forms of memory may also underlie extinction. We examined this hypothesis by training rats in a task in which extinction behavior could putatively be acquired by either a cognitive or habit memory system. Adult male Long-Evans rats w
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9

Kurosoy, Ersel. "Opposed jets, flames and extinction." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402177.

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10

Reed, Melissa. "Computer modelling of mammoth extinction." Thesis, University of Reading, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297314.

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11

Hansford, James. "Diversity and extinction in Aepyornithidae." Thesis, University of Southampton, 2018. https://eprints.soton.ac.uk/424753/.

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The Aepyornithidae are an insular radiation of giant birds from the late Quaternary of Madagascar which have been extinct for c. 1000 years. Complex and conflicting historical taxonomic hypotheses have limited study into these charismatic megafauna and they have been subject to little modern study in comparison to other avian megafauna and the mammalian megafauna of Madagascar. This thesis is the first modern study of Aepyornithidae to quantify the diversity and biogeography of skeletal remains in comparison to putative taxonomic hypotheses. Clarifying the convoluted history of historically pr
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12

Quinto, Clara. "Extinction of type II supernovae." Thesis, Uppsala universitet, Observationell astrofysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-415497.

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13

Bartlett, Alastair Ian. "Auto-extinction of engineered timber." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31052.

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Engineered timber products are becoming increasingly popular in the construction industry due to their attractive aesthetic and sustainability credentials. Cross-laminated timber (CLT) is one such engineered timber product, formed of multiple layers of timber planks glued together with adjacent layers perpendicular to each other. Unlike traditional building materials such as steel and concrete, the timber structural elements can ignite and burn when exposed to fire, and thus this risk must be explicitly addressed during design. Current design guidance focusses on the structural response of eng
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14

Knott, Stewart H. "Processes surrounding the extinction of Dentoglobigerina altispira : a case study of the 'paradox of pelagic extinction'." Thesis, University of Bristol, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.441337.

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15

Neshausen, Leanne. "Variability in Extended and Alternating Extinction." The University of Waikato, 2008. http://hdl.handle.net/10289/2228.

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Hens were trained to peck a square stimulus on a touch-sensitive screen under an FR5 reinforcement schedule for a maximum of 30 reinforcers (taking approximately 10 minutes). Then hens experienced extinction sessions of 40 minutes duration. For a total of six conditions, reinforcement and extinction conditions were alternated. Each condition consisted of between approximately 7 and 10 sessions. Results show that structures developed during conditioning remain in extinction, at least for the duration of previous reinforcement sessions. After approximately 10 minutes, behaviour becomes more vari
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16

Smith, Fraser D. M. "Case studies in biogeography and extinction." Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334231.

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17

Bazyan, Saloume. "Sexual selection and extinction in deer." Thesis, Uppsala universitet, Institutionen för biologisk grundutbildning, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-211535.

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By performing a comparative analysis and using phylogenetic relationships of the Cervidaefamily this study aimed to address whether or not sexual selection may play a role in the extinctionof species by making species more vulnerable to extinction. The role of sexual selection in makingspecies more vulnerable to extinction is largely unexplored, and several factors such as ecologicaland life history traits may increase the risk of extinction.In all species of the family Cervidae (Gilbert et al. 2006, Geist 1998,Groves and Grubb2011,Meijaardand Groves2004,Price et al. 2005, Goss 1983) sexually
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18

Maslanka, William Michael. "Extinction of microwave radiation in snow." Thesis, University of Reading, 2017. http://centaur.reading.ac.uk/72703/.

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Global observations of snow cover and snow water equivalent are vitally important for climatological and hydrological studies, at both global and local scales. Passive microwave remote sensing techniques have been used over the past 30 years to produce global estimations of snow water equivalent through empirical calculations. However, the uncertainties surrounding the influence of snow microstructure has led to large errors in snow water equivalent estimation. This study examined the extinction properties of the natural snowpack and produced a new extinction coefficient, for use with the semi
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19

Colas, Bruno. "Centaurea corymbosa : chronique d'une extinction annoncée." Tours, 1997. http://www.theses.fr/1997TOUR4028.

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Centaurea corymbosa pourret (asteraceae) est une espèce végétale endémique de seulement 3 km#2, sur le massif de la Clape, dans l'Aude. Six populations, qui occupent des falaises calcaires, distantes de 300 m a 2 km, comprennent chaque année de quelques individus reproducteurs a environ 200, pour un total de 500. Afin de comprendre le fonctionnement des populations de cette espèce, dans une perspective de conservation, une approche multi-disciplinaire a été utilisée. La synthèse de résultats démographiques, écologiques, et de génétique des populations, nous permet de mieux comprendre les cause
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20

Renault, Olivier. "Extinction et persistance des especes rares." Paris 6, 2001. http://www.theses.fr/2001PA066211.

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Cette these s'interesse aux especes rares et aux mecanismes de leur persistance. Dans les trois premiers chapitres, nous demontrons la pertinence de la notion de processus quasi-stationnaire comme modele de la dynamique des especes rares et en tirons des consequences pour la conservation de telles especes. Nous analysons en detail le cas du crotale de willard (crotalus willardi). Cette espece bien connue des herpetologistes pour sa rarete, coexiste en plusieurs points de sa distribution avec le crotale rupestre (c. Lepidus klauberi), proche parent phylogenetique et ecologique, mais dont les ef
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21

Swinburne, Nicola Helga Margaret. "The extinction of the rudist bivalves." Thesis, Open University, 1990. http://oro.open.ac.uk/54415/.

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The rudist bivalves were one of the many and varied groups of organisms to be extinguished at the end of the Cretaceous Period. They were a group of bivalves which evolved during Late Jurassic times to dominate the carbonate shelves on the margins of the Tethys Ocean during the Cretaceous Period. Through Late Cretaceous times their diversity climbed to a peak and then entered a period of rapid decline, resulting eventually in the complete extinction of the group. Theories as to the cause of that extinction should clearly be based upon a knowledge of the detailed pattern of the decline. Most im
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22

Lilly, Bryanna R. "A Laboratory Human Operant Examination of Extinction Bursts." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc849757/.

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The present study examined operant extinction in a controlled setting using a human operant paradigm. Participants watched a preferred video. During the video, either the video or audio portion of the video was selectively removed, on average every 15 s. Participants could restore the video by pressing a force transducer. In one group, relatively low forces were required (250 g) and in the other relatively high forces were required (750 g). At the 20th and 30th minute during the session, the video or audio was removed but the participants could not restore the component for 30 s. The resu
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23

Swanson, Timothy Michael. "The international regulation of extinction : an economic analysis of the forces causing and controlling the extinction of species." Thesis, London School of Economics and Political Science (University of London), 1993. http://etheses.lse.ac.uk/1246/.

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This thesis explains the decline of biological diversity as the result of a particular form of dynamic externality inherent within the global development process. Agricultural technology and learning have become embedded within particular species, by reason of species-specific investments, and the diffusion of these technologies has implied the adoption of these particular species as well. The decline of biological diversity has been the consequence of this development process, which carries with it the by-product of a homogenised biosphere. This theory has important implications for the regul
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24

Woodall, Anna. "Evaluative ratings in counter-conditioning and extinction /." [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19213.pdf.

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25

Zhang, Huangwei. "Extinction in turbulent swirling non-premixed flames." Thesis, University of Cambridge, 2015. https://www.repository.cam.ac.uk/handle/1810/254974.

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This thesis investigates the localized and global extinction in turbulent swirling non-premixed flames with Large Eddy Simulation (LES) and sub-grid scale Conditional Moment Closure (CMC) model. The first part of this thesis describes the derivations of the three dimensional conservative CMC governing equations and their finite volume discretization for unstructured mesh. The parallel performance of the newly developed CMC code is assessed. The runtime data coupling interface between the 3D-CMC and LES solvers is designed and the different solvers developed during the course of this research a
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26

Spash, Clive L. "Bulldozing Biodiversity: The Economics of Optimal Extinction." WU Vienna University of Economics and Business, 2015. http://epub.wu.ac.at/4450/1/sre%2Ddisc%2D2015_01.pdf.

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Many conservationists have become enamoured with mainstream economic concepts and approaches, described as pragmatic replacements for appeals to ethics and direct regulation. Trading biodiversity using offsets is part of the resulting push for market governance that is promoted as a more efficient means of Nature conservation. In critically evaluationg this position I start by explaining the assumptions behind biodiversity and ecosystem valuation and how economic logic legitimises, rather than prevents, ongoing habitat destruction and treats species extinction as optimal. Biodiversity of
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27

Gaiger, Frances Jean. "Mid-Pleistocene Extinction of Deep-Sea Ostracoda?" Thesis, University of Canterbury. Geological Sciences, 2006. http://hdl.handle.net/10092/1349.

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A global extinction event has been documented in protozoan foraminifera in the late Pliocene to Pleistocene. The timing of the extinction event varied depending on location, however for Ocean Drilling Project Site 1125, disappearances occurred between 2.5 and 0.57 Ma, with the major decline approximately 1.1 Ma. In order to determine if this event affected benthic organisms other than protozoans, this study was undertaken to determine how podocopid ostracods (Crustacea) recovered Ocean Drilling Program Site 1125 responded. The present study was hindered by the small number of valves recovered
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28

Little, Crispin T. S. "The Pliensbachian-Toarcian (Lower Jurassic) extinction event." Thesis, University of Bristol, 1995. http://hdl.handle.net/1983/7b6dcf05-90f5-4bfd-8090-d6eb2a3eeab5.

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29

Giovangigli, Vincent. "Structure et extinction de flammes laminaires prémélangées." Paris 6, 1988. http://www.theses.fr/1988PA066258.

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Diverses analyses asymptotiques, numeriques ou mathematiques de flammes monoreactionnelles planes ou etirees. Plusieurs etudes numeriques de flammes etirees a cinetique chimique complexe. Limites d'extinction de ces flammes en fonction de la nature du melange gazeux reactif et de l'etirement impose par l'ecoulement
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30

Lennard, Christopher James. "The causes of avian extinction and rarity." Master's thesis, University of Cape Town, 1997. http://hdl.handle.net/11427/20042.

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Bibliography: pages 144-153.<br>Biological extinction rates have escalated by as much as 1000 times the background extinction rate over the last 1500 years, causing concern over the long-term survival of many species. Avian extinctions since 1600 have been well documented relative to other taxa, as have current levels of avian threat. This study analyses avian extinctions post-1600 and current threats in an attempt to develop some predictive capacity about which avian taxa should be awarded the highest conservation priority. Analyses performed include examinations of the causes of avian extinc
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31

Bielby, Jon. "Extinction risk and population declines in amphibians." Thesis, Imperial College London, 2008. http://hdl.handle.net/10044/1/4278.

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This thesis is about understanding the processes that explain the patterns of extinction risk and declines that we see in amphibians, how we can use that understanding to set conservation priorities, and how we can convert those priorities into practical, hands-on research and management. In particular, I focus on the threat posed by the emerging infectious disease, chytridiomycosis, which is caused by the chytrid fungus, Batrachochytrium dendrobatidis (Bd). Amphibians display a non-random pattern of extinction risk, both taxonomically and geographically. In chapter two I investigate the mecha
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32

Kostka, Markus. "Modelling extinction and reignition in turbulent flames." Thesis, Imperial College London, 2008. http://hdl.handle.net/10044/1/7270.

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The presented work attempts to extend the conditional moment closure method for noon-premixed. turbulent combustion to predict extinction and reignition phenomena in turbulent flames. The conditional moment closure method is one of a class of conserved scalar modelling approaches in turbulent non-premixed combustion. where chemistry is treated as mainly dependend on the mixing of oxidizer and fuel. However. as designers of combustion devices aim for higher turbulence rates to enhance mixing and promote combustion, chemical conversion is not solely determined by the rate at which fuel and oxidi
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33

Fritz, Susanne. "Comparative analyses of extinction risk in vertebrates." Thesis, Imperial College London, 2009. http://hdl.handle.net/10044/1/5275.

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Measures of current extinction risk imply that a high proportion of the world’s species are threatened with global extinction in the near future, stressing the need for thorough understanding of extinction processes. In this thesis, I investigate three aspects of current global species extinction risk, using novel phylogenetic and spatially-explicit comparative methods. First, I develop a new measure of the phylogenetic-signal strength in extinction risk, and use it to show that the nonrandomness in global mammalian extinction risk differs with threatening processes. These results imply that t
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34

Giovangigli, Vincent. "Structure et extinction de flammes laminaires prémélangées." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37613930q.

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35

Chan, Chung Kiu Jonas. "Mechanisms of the Partial Reinforcement Extinction Effect." Thesis, The University of Sydney, 2019. http://hdl.handle.net/2123/20925.

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The partial reinforcement extinction effect (PREE) is a well-known phenomenon in associative learning. It refers to the paradoxical observation that after an animal has been trained on a partial reinforcement (PRf) schedule, it exhibits greater responding in the face of extinction than an animal that was trained on a continuous reinforcement (CRf) schedule, even if it has received fewer pairings of the conditioned stimulus (CS) and the unconditioned stimulus (US). The current thesis investigated the mechanisms that produce the PREE. We showed that the PREE is eliminated when partially reinforc
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36

Waterkotte, Megan Elizabeth. "The Role of Caffeine in Memory Extinction." Thesis, The University of Arizona, 2011. http://hdl.handle.net/10150/145094.

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37

Olofsson, Sven. "Extinction in Molecular Clouds : Case of Barnard 335." Doctoral thesis, Stockholms universitet, Institutionen för astronomi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-72523.

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The Bok globule B335 is a small molecular cloud in the solar neighbourhood near the galactic plane. The aim for this three-paper-study is to construct and analyze the extinction for this globule. The method we apply is to use the light from field stars behind the cloud in broadband filters ranging from UV to the mid-infrared. We have observations performed at the ESO telescopes at La Silla and Paranal as well as at the Nordic 2.5 m telescope at La Palma. Together with images and spectra from 2MASS-, ISO- and Spitzer-archives we are able to cover the wavelength range from 0.35 to 24 μm. An impo
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38

Kim, Jee Hyun Psychology Faculty of Science UNSW. "Extinction of conditioned fear in the developing rat." Publisher:University of New South Wales. Psychology, 2008. http://handle.unsw.edu.au/1959.4/41106.

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The present thesis examined extinction of conditioned fear in the developing rat. In the adult rat, the hippocampus is thought to be important for the context-specificity of extinction. Because the hippocampus is a late-maturing structure, it was hypothesised that context-modulation of extinction may be different across development. The first series of experiments investigated reinstatement of extinguished fear in the developing rat (Chapter 2). The results showed that P24 rats exhibited context-specific reinstatement. On the other hand, P17 rats did not exhibit reinstatement of extinguished f
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39

Grenyer, Richard. "Comparative approaches to the prediction of extinction risk." Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408110.

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40

Worsfold, Nicholas. "The consequences of extinction in experimental aquatic communities." Thesis, University of Sheffield, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.489745.

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Predicting the consequences of extinction is an important goal in ecology, due to the accelerating rate of global and local species loss. Cascading extinction~ the extinction of one species as a consequence of the extinction of another, has been demonstrated in several natural ecosystems and is widely predicted by theoretical studies. Extinction may also affect the functioning of ecosystems, as functionally important species may be lost from communities and positive interactions between species may be disrupted. Investigating the consequences of extinction in natural ecosystems is difficult, a
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41

Bond, David P. G. "Oceanographic changes during the Frasnian-Famennian mass extinction." Thesis, University of Leeds, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401091.

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42

McCullough, Trevor. "Intracerebroventricular chlordiazepoxide and the partial reinforcement extinction effect." Thesis, University of Ulster, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284859.

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43

Cole, Selina R. "Phylogeny, Diversification, and Extinction Selectivity in Camerate Crinoids." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492594839778373.

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44

Rogers, Valerie R. "Extinction-induced variability in young children with autism /." abstract and full text PDF (UNR users only), 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1455657.

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Thesis (M.A.)--University of Nevada, Reno, 2008.<br>"May 2008." Includes bibliographical references (leaves 32-34). Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2009]. 1 microfilm reel ; 35 mm. Online version available on the World Wide Web.
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45

Sripakagorn, Paiboon. "Local extinction and reignition in turbulent nonpremixed combustion /." Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/7043.

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46

O'Leary, S. G. "Context specificity in the extinction of learned fear." Thesis, University College London (University of London), 2013. http://discovery.ucl.ac.uk/1462447/.

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This thesis explores the role of context in the extinction of learned fear and environmentally specific renewal of the fear response. It has clinical relevance in relapse of previously extinguished anxiety. Part 1 is a literature review that systematically examines the findings and methodologies within the behavioural field regarding the role of context in extinguished fear relapse in humans. It explores the main areas of investigation and critically appraises each study. Part 2 is an empirical paper examining the effect of contextual change on fear responses following extinction. The research
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47

Arnaud, Manon. "L'extinction des conventions et accords collectifs de travail." Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTD035.

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La volonté exprimée par le législateur de renforcer la place de la norme conventionnelle au sein du droit du travail, témoigne de l’importance devant être accordée à l’acte conventionnel de sa formation à son extinction, en passant par son exécution. Cette thèse aura ainsi pour objet d’étudier la phase d’extinction et plus spécifiquement les différents mécanismes conduisant à l’anéantissement des conventions et accords collectifs de travail. L’analyse de ces derniers conduit ainsi à opérer une distinction selon l’origine du fait générateur de l’extinction. L’extinction sera dite assumée lorsqu
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48

Valles, Rodrigo Jr. "Behavioral mechanisms underlying the extinction of cocaine self-administration." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3105.

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The aim of the present series of experiments was to outline the influence of different doses of cocaine during training, training schedule, training length and abstinence duration to modulate subsequent extinction and reinstatement patterns. Abram Amsel’s general theory of persistence were used to both design and explain various aspects of these models. For Experiment 1, rats self-administered cocaine (0.25, 0.50 or 1.00 mg/kg) intravenously and were then tested in an extinction preparation using saline infusions (5 days) and then only the stimulus light as the reinforcer (3 days). Experiment
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49

Yuzhe, Li. "Computational Investigations on Uncertainty-Dependent Extinction of Fear Memory." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225756.

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50

Gonzalez, Andrew. "Extinction : the role of habitat fragmentation and environmental variability." Thesis, Imperial College London, 1998. http://hdl.handle.net/10044/1/12032.

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