Dissertations / Theses on the topic 'Parasite'
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Boissier, Jérôme. "Sexe et schistosome : écologie des interactions hôte-parasite et parasite-parasite." Perpignan, 2001. http://www.theses.fr/2001PERP0478.
Full textThe life cycle of the genus Schistosoma is analysed both considering the host-parasite interactions as a function of the parasite sex and the parasite-parasite sex-dependant interactions. Studies of the host-parasite interactions according to the sex of infection revealed that male schistosomes are more pathogenic than females both in the mollusc and in the vertebrate host. Concerning the mollusc host, a male-infected mollusc was more affected in its nutrition, relation and reproductive functions than a female-infected mollusc. Concerning the vertebrate host, the pathogeny depended on the sex of the host and on the sex of the parasite. Female mice were less affected than male mice and male parasites had a higher stimulation on the immune system of the host than had female parasites. These differences between male and female pathogeny revealed different sexual strategies along the schistosome life cycle. The parasite-parasite interactions were analysed both in the mollusc and in the vertebrate hosts. Concerning the mollusc host, the simultaneous presence of both sexes, in a mollusc increases the development success of the larvae shed by this mollusc. Concerning the vertebrate host we showed intra and intersexes interactions. Genetically different females would complete each other (intrasexual interaction) and would choose there males (intersexual interaction). These interactions could be linked to sexual phenomena which could influence the life-history traits of these parasites
Rakowitz, Michael. "ParaSITE." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/69401.
Full textIncludes bibliographical references (p. 71).
paraSITE proposes the appropriation of exterior ventilation systems on existing architecture to inflate pneumatic shelters that are designed for homeless people. This project involves the production of a series of inflatable prototypes, the distribution of these devices to a group of homeless people, and the subsequent use of these shelters in relation to a building.
by Michael Jonathan Rakowitz.
S.M.
Schneider, Maria Victoria. "Modes de reproduction chez le parasitoi͏̈de solitaire Venturia canesces." Lyon 1, 2003. http://www.theses.fr/2003LYO10071.
Full textIsomursu, M. (Marja). "Host–parasite interactions of boreal forest grouse and their intestinal helminth parasites." Doctoral thesis, Oulun yliopisto, 2014. http://urn.fi/urn:isbn:9789526203645.
Full textTiivistelmä Loiset kuuluvat erottamattomana osana luonnonvaraisten lintujen elämään. Ne voivat aiheuttaa sairautta, kuolleisuutta tai hedelmällisyyden alentumista. Tyypillisesti loiset ovat levinneet isäntäpopulaatioon epätasaisesti ja monet isännän ominaisuudet (esim. ikä) vaikuttavat levinneisyyteen. Tietyissä oloissa loiset voivat jopa säädellä isäntäpopulaatiotaan. Suomalaiset metsäkanalinnut — metso Tetrao urogallus, teeri Lyrurus tetrix ja pyy Tetrastes bonasia — ovat useiden suolistoloismatolajien isäntiä. Metsäkanapopulaatiot ovat vaihdelleet syklisesti, mutta syklejä aiheuttavat mekanismit ovat yhä tuntemattomia. Tutkin metsäkanalintujen ja niiden suolistoloisten välisiä vuorovaikutuksia käyttäen metsästäjien vuosina 1995–2002 viidestä eri riistanhoitopiiristä keräämiä suolistonäytteitä. Yleisin loislaji näytteissä oli kanalintusuolinkainen, Ascaridia compar. Myös kolme heisimatolajia (Skrjabinia cesticillus, Paroniella urogalli ja Hymenolepis sp.) todettiin. Suuri koko, koirassukupuoli ja yli yhden vuoden ikä olivat yhteydessä suurempaan kanalintusuolinkaistartunnan todennäköisyyteen ja voimakkuuteen. Nuorilla (alle 1 v.) linnuilla heisimadot olivat yleisiä, kun taas aikuisilla tartunnat olivat varsin harvinaisia. Sisäsiittoisuuden vaikutusta loistartuntaherkkyyteen tutkittiin metsolla mikrosatelliittiheterotsygotian perusteella. Vähemmän heterotsygoottiset metsot olivat todennäköisemmin ja voimakkaammin suolinkaisten infektoimia, mikä viittaa sisäsiittoisuuden negatiiviseen vaikutukseen loisten vastustuskykyyn. Loisten epäsuora haitallinen vaikutus havaittiin, kun verrattiin koiran kanssa ja ilman koiraa metsästettyä lintusaalista. Heisimadot olivat selvästi yleisempiä linnuilla, jotka oli metsästetty koiran kanssa kuin ilman koiraa metsästetyillä. Heisimatotartunta näytti siis altistavan metsäkanoja koiraeläinten saalistukselle. Metsäkanalintu- ja loispopulaatioiden välistä vuorovaikutusta tutkittiin analysoimalla vuosittaisia metsäkanatiheyksiä ja loisten runsautta. Kanalintusuolinkainen oli yleisimmillään ja runsaimmillaan metsäkanatiheyden laskuvuosina. Metsäkanapopulaation vuosittainen kasvuvauhti korreloi negatiivisesti kanalintusuolinkaisen vuosittaisen runsauden kanssa. Suhteellinen elossasäilyvyys laski kanalintusuolinkaisen runsauden lisääntyessä, mutta lisääntymistuloksen suhteen ei ollut samaa ilmiötä. Löydökset viittaavat siihen, että kanalintusuolinkaisella on vaikutusta suomalaisten metsäkanalintukantojen vaihteluihin, vaikka syklisiä kannanvaihteluja ei enää havaitakaan
St, Vincent Chad Michael. "'Parasite single' women of Japan : 'parasites' or search for a new identity? /." Title page, contents and introduction only, 2002. http://web4.library.adelaide.edu.au/theses/09AR/09ars7749.pdf.
Full textGoodhead, Ian Barry. "Genomic approaches to understanding host resistance and parasite virulence in Trypanosoma parasites." Thesis, University of Liverpool, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.570185.
Full textFerté, Hubert. "Les nématodes parasites du tube digestif du chevreuil (Capreolus capreolus L. 1758) : à propos d'une enquête réalisée dans le nord-est de la France." Tours, 1987. http://www.theses.fr/1987TOUR3805.
Full textMintsa, Nguema Rodrigue. "Interactions hôte-parasite dans le modèle Biomphalaria pfeifferi-Schistosoma mansoni du Dhofar (Oman) : génétique des populations de l’hôte, traits d’histoire de vie et conséquences sur la transmission du parasite." Perpignan, 2010. http://www.theses.fr/2010PERP0995.
Full textThis thesis has been conducted in the context of the reemergence of schistosomiasis caused by Schistosoma mansoni (flatworm trematode) in Dhofar (Oman). The work focuses on the host-parasite interactions and their implications on schistosome transmission. The first part is devoted to a spatiotemporal study of the population genetics of Biomphalaria pfeifferi (freshwater gastropod snail). Nine microsatellite markers were used for characterization of 18 populations of B. Pfeifferi. The results showed that intrapopulations genetic variability was very low. However, the populations were highly differentiated. Temporal differentiation was also recorded in some populations. A second part concerns to the study of the life-history traits and host-parasite relationships. It was conducted using eight host-parasite combinations that differ either by the parasite population (human versus murine), by the waterbody category (natural versus man-made) or by the morph of the snail (pigmented versus albino). The following life-history traits were analyzed: growth, fecundity and survival of B. Pfeifferi and rate of infection, prepatent period and cercarial production of S. Mansoni. The results show that both the origin of S. Mansoni and the pigmentation of B. Pfeifferi play a major role in transmission of schistosomiasis in Dhofar. The results are discussed in terms of host-parasite compatibility
Houngbédji, Tossimidé. "Rhamphicarpa fistulosa : infestation dans les bas-fonds rizicoles de la Région des Savanes (Togo) et étude des interactions hôte-parasite." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS455/document.
Full textMain biotic constraints to rain-fed lowland rice cultivation in northern Togo include the parasitic weed Rhamphicarpa fistulosa (Hochst.) Benth. In order to evaluate efficient strategies to control R. fistulosa, our study was performed taking into account the following main objectives: 1) Identification of the distribution of R. fistulosa and study of the factors favouring its infestation, 2) Study of the impacts of infestation levels on rice weed communities, and 3) Characterization of the host-parasite interactions and their impacts on the host development and the parasite reproduction. Following fields investigations, highest infestations were observed on sandy soils with low levels of organic matter.In addition, weed flora found in the presence of R. fistulosa was much diversified and some weeds were found to been parasitized and could possibly constitute reservoirs to increase the seed stock of the parasite. In controlled experiments, R. fistulosa grown and reproduced better on rice and tomato crops, than on soybean which delayed the reproduction of the parasite. Germination of R. fistulosa seeds was stimulated in presence of cultivated crops or weeds. New collected seeds shown six months dormancy but their germination was stimulated in presence of phytohormones. In conclusion, the best strategies to control R. fistulosa must include delayed sowing, crop rotation with leguminous species (i.e. soybean, peanut or cowpea) and vegetable cropsKeywords: Rhamphicarpa fistulosa, rice, lowland, parasitism, host-parasite interaction, weeds
Oliveira, Ana Carolina Santos. "Mecanismos parasitários de escape ao sistema imunológico." Master's thesis, [s.n.], 2011. http://hdl.handle.net/10284/2486.
Full textA evasão ao sistema imunulógico, por parte dos parasitas, está actualmente omnipresente e envolve uma série de mecanismos moleculares, que reflectem a evolução, reprodução e crescimento parasitário. Existem uma série de formas e processos de escape parasitário permitindo com que estes garantam, simultaneamente, a sua sobrevivência e a do hospedeiro. A co-evolução convergente entre hospedeiro e parasita sustêm a base destes mecanismos que se baseiam na manipulação dos processos que fazem parte e regulam a resposta imunitária e o normal funcionamento das células de defesa do hospedeiro, ficando a resposta inata e adaptativa vulnerável à acção parasitária. O fenómeno de evasão parasitária foi descoberto há cerca de 100 anos, por aquele que é considerado o pai da Imunologia, Paul Erlich; este durante alguns dos seus estudos observou “o desaparecimento dos receptores” característicos dos anticorpos do sistema imune, em Trypanossomas africanos. A partir daí as funções genéticas, alterações de variantes antigénicas, moléculas supressoras do sistema imune têm sido amplamente descobertas e estudadas. A importância do conhecimento das adaptações parasitárias é fundamental para o desenvolvimento de terapeuticas na área da medicina, imunologia, parasitologia e farmacologia visto que destas se obtêm dados fundamentais sobre a interecção entre estes microorganismos e sobre as patologias que podem causar. Desta feita este trabalho aborda, então esses mecanismos, explicando ainda de forma sintética a constituição do sistema imune de forma a direccionar facilmente e localizar o centro de ataque parasitário, demonstrando a forma ágil e habilidosa com que estes seres conseguem ludibriar um complexo sistema como é o sistema imunitário de um indivíduo imunocompetente. Evasion of immunologic system, by parasites, is now ubiquitous and involves several molecular mechanisms that reflect the evolution, parasite growth and its reproduction. There are a number of forms and escape processes which have been adopted by parasits ensuring survival of both parasite and host. The convergent co-evolution of host and parasite is the basis of these mechanisms that rely on manipulation of the processes which are part of the immune response and regulate it, as well as, the normal functioning of host defense cells, leaving the innate and adaptive response vulnerable to parasite activity. The phenomenon of parasite evasion was discovered about 100 years ago, by one considered the father of Immunology, Paul Ehrlich. This has been found during some of his studies where disappearance of the antibody receptors characteristic of the immune system of the African trypanosome, was observed. Since then, gene functions, changes in antigenic variants and suppressing molecules of immune system have been extensively discovered and studied. The importance of the knowledge of parasitic adaptations is crucial for the development of new therapeutics in medicine, immunology, parasitology and pharmacology since these data reflect the interaction between microorganisms and the immune system and also related diseases. With this dissertation we will have an overview of these mechanisms and a brief explanation of the immune system in order to easily locate the center of parasitic attack, demonstrating how agile and skilled these living beings can evade a complex system like the immune system of immunocompetent individuals.
Prior, Kimberley Faith. "The evolutionary ecology of circadian rhythms in malaria parasites." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/29562.
Full textVandame, Rémy. "Importance de l'hybridation de l'hôte dans la tolérance à un parasite : cas de l'acarien parasite Varroa jacobsoni chez les races d'abeille Apis mellifera européenne et africanisée, en climat tropical humide du Mexique." Lyon 1, 1996. http://www.theses.fr/1996LYO10306.
Full textWilliams, Emily Rose-Margaret. "Parasites and the ecological undead: marine snails and their suite of trematodes." Thesis, The University of Sydney, 2012. https://hdl.handle.net/2123/28920.
Full textCampbell, Scott Edward. "Secreted proteins in Microsporidian parasites : a functional and evolutionary perspective on host-parasite interactions." Thesis, University of Exeter, 2013. http://hdl.handle.net/10871/14523.
Full textO'Brien, Chris. "Appreciating the Importance of Parasites: Analyzing and Understanding the Ecology of Parasite-Host Interactions." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/194212.
Full textGrenier, Simon. "Biologie et physiologie des relations hôtes-parasitoïdes chez 3 tachinaires (Diptera, Tachinidae) d'intérêt agronomique : développement en milieux artificiels : lutte biologique." Lyon 1, 1986. http://www.theses.fr/1986LYO10004.
Full textMorgan, Andrew. "Experimental host-parasite coevolution." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.424864.
Full textJones, R. S. "Parasite-induced warning colouration." Thesis, University of Liverpool, 2016. http://livrepository.liverpool.ac.uk/3006078/.
Full textSyed, Abeer. "Microsystems for parasite enrichment." Thesis, University of Glasgow, 2013. http://theses.gla.ac.uk/4353/.
Full textSerne-Delaves, Micheline. ""Blastocystis hominis" Brumpt, 1912 et blastocystose humaine : un parasite méconnu, une parasitose discutée." Paris 5, 1993. http://www.theses.fr/1993PA05P017.
Full textBell, Andrew Stuart. "Studies on the biosystematics and biology of strigeids (Digenea) parasitic in freshwater fish." Thesis, University of Stirling, 1995. http://hdl.handle.net/1893/3383.
Full textPereira, Felipe Bisaggio. "Estrutura da comunidade de helmintos associados ao lagarto Tropidurus torquatus (Squamata: Tropiduridae) em uma área de afloramento rochoso no distrito de Toledos, Juiz de Fora, MG." Universidade Federal de Juiz de Fora (UFJF), 2010. https://repositorio.ufjf.br/jspui/handle/ufjf/3017.
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CNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
A comunidade parasitária do lagarto Tropidurus torquatus em uma área de campo rupestre localizada no estado de Minas Gerais, sudeste do Brasil, foi estudada. Dos 110 hospedeiros analisados, 92 (83,6%) estavam infectados. Foram encontradas cinco espécies de helmintos, três de nematóide: Physaloptera lutzi, Parapharyngodon sp. e Oswaldofilaria sp., uma espécie de cestóide e um cistacanto não identificados. Apenas as espécies de nematóides apresentaram dados suficientes para analises ecológicas, sendo P. lutzi a espécie mais prevalente (67,3%) e com maior intensidade parasitária (4,86±4,85). Somente para Oswaldofilaria sp. foram encontradas diferenças significativas na prevalência e intensidade parasitária entre hospedeiros fêmeas e machos, esses últimos apresentando os maiores valores. A intensidade parasitária total e de P. lutzi também diferiram entre os sexos de hospedeiros com machos apresentando os maiores valores. O tamanho corporal do hospedeiro correlacionou-se de forma positiva com a intensidade de infecção de todas as espécies de nematóides. A sazonalidade local não influenciou de forma significativa a estrutura da comunidade componente de parasitos estudada. Aspectos do hospedeiro como dieta, dimorfismo sexual e comportamento (territorialiasmo e forrageamento) representaram importantes fatores na determinação da estrutura dessa comunidade de helmintos. De maneira geral, a comunidade parasitária apresentou baixa riqueza de espécies e um caráter não interativo, características comuns em comunidades parasitárias de répteis como hospedeiros.
The helminth community of the lizard Tropidurus torquatus from a rocky outcrop located in Minas Gerais state, southeast Brazil, was studied. Ninety two of the one hundred ten individuals examined (83,6%) harbored helminths. A total of five helminth species were found, tree nematodes: Physaloptera lutzi, Parapharyngodon sp. and Oswaldofilaria sp., one cestode species and one acanthocaphalan cystacanth not identified. Only nematode species had sufficient data to perform ecological analysis with Physaloptera lutzi showing the highest prevalence (67,3%) and mean intensity (4,86±4,85). Prevalence and intensity of infection between males and females hosts differed only for Oswaldofilaria sp., with males showing the highest values. Total and P. lutzi intensity of infection were different among males and females hosts, with males showing the highest values. The host body size was positively related to intensity of infection for all nematode species. Local seasonality had no influence in the helminth community structure. Host diet, sexual dimorphism and behavior (territorialism, forage strategy) represented important factors in the structuring of this parasite community. In general lines, the helminth community was species poor and non interactive, representing a typical community structure found in herps hosts.
Besnard-Cochennec, Nathalie. "Bonamia ostreae, parasite de l'huître plate, Ostrea edulis : sa position taxonomique parmi les parasites du groupe "microcell" : analyses des interactions hôte-parasite chez plusieurs populations d'huître plates." La Rochelle, 2001. http://www.theses.fr/2001LAROS073.
Full textIbikounle, Moudachirou. "Les Schistosomoses au Bénin : épidémiologie et écologie des interactions hôte-parasite." Perpignan, 2006. http://www.theses.fr/2006PERP0706.
Full textThis work presents an epidemiological and an ecological study of schistosomiasis in Benin. A synthesis of the epidemiological knowledge of schistosomiasis in the space of the Economic Community of West Africa States (ECOWAS) was carried out. Furthermore, in Benin, we confirmed the existence of the two human schistosomes : S. Haematobium and S. Mansoni on the five existing in the ECOWAS space in which Benin is located (S. Haematobium, S. Mansoni, S. Guineensis, S. Bovis and S. Curassoni). The prevalence obtained for S. Haematobium was 85% and that for S. Mansoni was 30%, and there was evidence for mixed human infections. We could find in Benin at least five potentially snail vector species : B. Forskalii, B. Globosus and B. Truncatus for S. Haematobium, B. Pfeifferi for S. Mansoni and I. Exustus, an exotic snail known to be the snail vector for S. Indicum, S. Spindale and S. Nasale in South-East Asia. I. Exustus is recorded for the first time in Benin in this work and no evidence of active transmission was made. The study of the snail-schistosome interactions showed that the different S. Haematobium populations were differently compatible with three of the four groups of Bulinus : the africanus group, the forskalii group and the reticulatus group and that the different S. Mansoni populations were equally compatible with B. Pfeifferi. The six life-history traits, parasite prepatent period, prevalence and cercarial production and snail growth, reproduction and survival were analyzed using five schistosome populations from Benin including three populations of S. Haematobium (Doh, Sô-Tchanhoué and Toho-Todougba) and two populations of S. Mansoni (Kpinnou and Toho-Todougba) and revealed that if the S. Haematobium populations seemed to be adapted to a local vector, this was not the case for the S. Mansoni populations. The study of the vertebrate-schistosome interactions revealed the existence of an infradian rhythm in the cercarial emissions of both S. Haematobium and S. Mansoni. The human behaviour, followed in one of the transmission sites (Toho-Todougba) where both schistosome species are present, was perfectly correlated with the schistosome chronobiology. This was interpreted in terms of adaptative strategy favouring the transmission of the parasite to its human host
Fredensborg, Brian Lund, and n/a. "Ecological interactions between the trematode parasite Maritrema novaezealandensis (Microphallidae) and its intermediate hosts in the New Zealand intertidal soft-sediment community." University of Otago. Department of Zoology, 2005. http://adt.otago.ac.nz./public/adt-NZDU20060810.154001.
Full textBadets, Mathieu. "Etude de la plasticité de développement de Polystoma gallieni, parasite de la rainette méridionale Hyla meridionalis : approches écologiques et moléculaires." Perpignan, 2008. http://www.theses.fr/2008PERP0937.
Full textWithin the synthetic theory of evolution, the processes and patterns of development highlight a new dimension into our understanding of the history of life. Like the natural and sexual forces of selection, development could promote or constrain the diversification of species. Through a combination of genetic modules and an amazing ability to interact with the environment, the development of an individual could be deflected in its trajectory to increase survival and reproduction. Therefore development which allows the expression of information (genetic) in a (ecological) system, would involve strategic trade-off revealing fine tuned adaptations. When species present a parasitic lifestyle, developmental strategy often includes this of transmission. Going from host to host within an ecosystem, the parasite has to bypass many filters that limit its ability to transmit and reproduce. What about the surprising plasticity triggered by a parasite of the genus Polystoma to complete its cycle? Depending on the characteristics of its host, the parasite alternates its developmental pathways in regards of transmission opportunities. This work shade lights on the importance of historical and ecological constraints behind developmental mechanisms and tempts to identify the source of selective pressures. Sole an integrative approach of the parasite development can report how the transmission may occur within a temporary and heterogeneous ecosystem
Dubois, Jacques. "Phylogénie moléculaire et morphologique des Pimplinae (Hymenoptera, Ichneumonidae) parasites d'araignées : scénarios évolutifs du mode de parasitisme." Paris, Muséum national d'histoire naturelle, 2005. http://www.theses.fr/2005MNHN0063.
Full textPimplinae are the subfamily whose parasitism patterns are the most diversified and biology one of the best known within the Ichneumonidae. Hypotheses on Pimplinae phylogeny being already established from morphological data, this work aimed at (1) supplying original molecular data, based on 28S and 16S rDNAs and CO1 analyses, in order to test the morphological hypotheses at a generic level; (2) detailing relationships within the Polysphincta genus group ; (3) establishing hypotheses about the evolution of parasitism patterns within this group. The study of the Polysphincta genus group, based on a morphological phylogeny, led to the redefinition of 21 genera, among which 3 were new. The subsequent inclusion of biological characters in the matrix enabled to retrace the evolutionary history of this group through the evolution of parasitism patterns and other behavioural traits of the larva and its cocoon
Le, Brun Nathalie. "Spécificité des relations hôtes-parasites : le modèle Cyprinidae-Diplozoon." Montpellier 2, 1988. http://www.theses.fr/1988MON20055.
Full textTabouret, Guillaume. "Oestrus ovis(linné 1761) [Diptera : oestridae] chez les ovins : application à la caractérisation des tumeurs mammaires." Toulouse 3, 2001. http://www.theses.fr/2001TOU30021.
Full textNno, Mabiala Alix Dania. "Mécanismes et agents de la virulence chez les parasitoïdes hyménoptères Braconides du genre Asobara : le cas particulier d'A. Japonica." Amiens, 2009. http://www.theses.fr/2009AMIE0109.
Full textSuccess of parasitoids depends on their ability to infest a host and to complete their development. Endophagous parasites are able to avoid, neutralize or deflect the innate immune response of encapsulation by the hemocytes of their host. The most common mechanism is the production of either immunosuppressive factors blocking this response or of toxic factors causing the death of the hemocytic cells. In this thesis, we compared the mechanisms and agents of the virulence in Hymenoptera braconid species of the genus Asobara. The two species A. Japonica and A. Persimilis, parasitoids of Drosophila larvae, were studied. Results were compared to those previously obtained in A. Tabida and A. Citri. We here show that A. Japonica strategy of immunosuppression permits the parasitoid to successfully escape encapsulation in 100% of the D. Melanogaster parasitized hosts. The virulence strategy of this species is based on the overall destruction of the host’s hematopoietic organ, associated with the inability of the larval host to amplify any hemocyte type. Differently, A. Persimilis eggs are encapsulated in 13% of D. Melanogaster host larvae. This parasitoid species affects, too, the host hematopoietic organ, although this effect is limited compared to A. Japonica. Lamellocytes, which number does not increase post-parasitization, seem to be the only host’s hemocyte type which is affected by A. Persimilis. The analysis of the factors responsible of the parasitoids virulence permitted to demonstrate a paralyzing then deadly effect of the venoms from both A. Japonica and A. Persimilis. Surprisingly, the deadly effect is regulated by the female wasps’ ovarian fluids. Therefore, both venom and ovarian fluids of the female wasps appear to be required for the successful development of the parasitoids. The identification of the wasps’ venom components has been initiated in A. Japonica, the species presenting the most toxic and immunosuppressive effect. We ask the question of the possible convergence between the strategies and agents developed by hymenopteran parasitoids to immunodepress their hosts. It appears that within the community of Drosophila larval parasitoids, there is some heterogeneity of the mechanisms and agents of immunosuppression, and that this heterogeneity is beyond the scope of the Asobara genus
Davies, Charlotte Mary. "Snail-schistosome interactions and the evolution of virulence." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343421.
Full textKelly, Colleen Kay. "Host use and foraging in the parasitic plant Cuscuta subinclusa." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184543.
Full textMcKay, Derek Mark. "Aspects of the neurobiology of two parasitic platyhelminths, with observations on host-parasite interactions." Thesis, Queen's University Belfast, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335561.
Full textPollok, Richard. "Cryptosporidium parvum : host-parasite interactions." Thesis, Queen Mary, University of London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402442.
Full textHerbert, Julian Richard. "Stochastic processes for parasite dynamics." Thesis, University College London (University of London), 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368164.
Full textWatson, Andrew Keith. "Characterising microsporidian host-parasite interactions." Thesis, University of Newcastle upon Tyne, 2016. http://hdl.handle.net/10443/3504.
Full textHallowell-Evans, Cara Louise. "Parasite control on thoroughbred studs." Thesis, University of Liverpool, 2017. http://livrepository.liverpool.ac.uk/3022893/.
Full textCaldevilla, Sonia. "Demodex folliculorum : parasite de l'homme." Paris 5, 1999. http://www.theses.fr/1999PA05P094.
Full textAli, K. S. M. "Immunity to Leishmania mexicana parasite." Thesis, Nottingham Trent University, 2014. http://irep.ntu.ac.uk/id/eprint/156/.
Full textMorga, Benjamin. "Etude des interactions hôte/parasite chez l'huître plate Ostrea edulis et son parasite Bonamia ostreae." Phd thesis, Université de La Rochelle, 2010. http://tel.archives-ouvertes.fr/tel-00618480.
Full textBrewster, Bernice. "Aquatic Parasite Information : a database on parasites of freshwater and brackish fish in the United Kingdom." Thesis, Kingston University, 2016. http://eprints.kingston.ac.uk/39278/.
Full textLester, Hannah. "Anthelmintic resistance in equine parasites : an epidemiological approach to build a framework for sustainable parasite control." Thesis, University of Liverpool, 2015. http://livrepository.liverpool.ac.uk/2029559/.
Full textDavis, Richard Elliot. "Neutrophil responses to infection with leishmania parasites: MHC class II-expression and parasite life-stage interactions." Diss., University of Iowa, 2016. https://ir.uiowa.edu/etd/2200.
Full textBouchut, Anne. "La compatibilité dans l’interaction Biomphalaria glabrata/Echinostoma caproni : recherche de gènes candidats." Montpellier 2, 2007. http://www.theses.fr/2007MON20009.
Full textHost/parasite interactions involving snails and trematodes showed a strong polymorphism for compatibility. This polymorphism leads to the existence of susceptible and resistant snails to the parasite in the same host population. In order to understand the molecular determinants responsible for the differential compatibility of the mollusc Biomphalaria glabrata for the trematode Echinostoma caproni, we developed several molecular approaches to compare two host strains, one susceptible and one resistant to E. Caproni. Previous studies provided evidence that differences exist between susceptible and resistant hosts humoral factors and that constitutive differences exist between susceptible and resistant hemocytes that concern their adhesion abilities. To further investigate the molecular basis of differences pointed out, we carried out (i) a comprehensive proteomic approach to compare protein content extracted from plasma or hemocytes, (ii) a transcriptomic approach, well targeted on genes potentially involved in adhesion processes in hemocytes and (iii) finally, the results we obtained led us to perform a complementary transcriptomic approach by constructing subtractive libraries on entire snails in order to identify other cellular compartments or tissues potentially involved in susceptibility-resistance processes. These studies revealed several candidate genes differentially expressed between susceptible and resistant snails and potentially implied in different functions that could participate in compatibility processes: (i) Parasite recognition and signalling pathways (Calcium binding Protein, glycolytic enzymes and C-type lectin) ; (ii) Mobility and adhesion (proteins containing Von Willebrand domains, cadherin, dermatopontins and intermediate filament protein) ; (iii) Immune defence effectors (protease inhibitors, proteases and aplysianin) and (iv) Regulation of gene expression (histone H4). Keywords: Biomphalaria glabrata, Echinostoma caproni, host-parasite interaction, compatibility, susceptibility-resistance, invertebrate, comparative molecular approaches
Khalaf, Sahira. "Parasite epidemiological and pollution/parasite interaction studies on sticklebacks (Gasterosteus aculeatus L.) from the River Wandle." Thesis, King's College London (University of London), 1998. https://kclpure.kcl.ac.uk/portal/en/theses/parasite-epidemiological-and-pollutionparasite-interaction-studies-on-sticklebacks-gasterosteus-aculeatus-l-from-the-river-wandle(86b59e83-fa4d-4a7c-8a08-87112517c39b).html.
Full textWhite, Emily Claire. "Infection by the gastrointestinal parasite Trichuris muris : defining the microbiota of the parasite and the host." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/infection-by-the-gastrointestinal-parasite-trichuris-muris-defining-the-microbiota-of-the-parasite-and-the-host(e29ed75d-014d-4e36-87ed-a6db82845511).html.
Full textRaine, John Dale. "Proteomic analysis of the malarial parasite." Thesis, Imperial College London, 2005. http://hdl.handle.net/10044/1/11358.
Full textTompkins, Daniel Michael. "Evolutionary ecology of bird-parasite associations." Thesis, University of Oxford, 1996. http://ora.ox.ac.uk/objects/uuid:a5f5ea19-b799-490b-b738-99ff52df25c1.
Full textEdwards, J. C. "Parasite-induced changes in host behaviour." Thesis, University of Nottingham, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380108.
Full textHuggins, Mary L. "A parasite model for lung eosinophilia." Thesis, University of Nottingham, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240928.
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