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Dissertations / Theses on the topic 'Parasites'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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1

Grenier, 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.

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2

Ferté, 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.

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3

Braga, Marta Isabel Fragoso Lampreia. "Prevalência e sazonalidade de parasitoses gastrointestinais, cardiovasculares e hemáticas em cães do distrito de Beja, Portugal." Master's thesis, Universidade de Lisboa, Faculdade de Medicina Veterinária, 2017. http://hdl.handle.net/10400.5/13687.

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Dissertação de Mestrado Integrado em Medicina Veterinária<br>Os cães têm um importante papel na sociedade actual, contribuindo frequentemente para o desenvolvimento físico, social e emocional de crianças e para o bem-estar dos seus donos; contudo, podem ser portadores de muitas parasitoses, algumas com importância na saúde animal e potencial zoonótico. Este trabalho surge devido à escassez de dados epidemiológicos em cães na região Sul de Portugal, pretendendo estudar a prevalência e a sazonalidade de parasitoses gastrointestinais, cardiovasculares e hemáticas em cães de três canis do distrit
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4

Schneider, Maria Victoria. "Modes de reproduction chez le parasitoi͏̈de solitaire Venturia canesces." Lyon 1, 2003. http://www.theses.fr/2003LYO10071.

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Venturia canescens, un parasitoi͏̈de ichneumonidé de chenilles de piralidés, a deux modes de reproduction : arrhénotoque, (mâles haploi͏̈des et femelles diploi͏̈des)) et thélytoque (des femelles vierges engendrent des filles diploi͏̈des). Cette thélytoquie n'est pas l'effet de bactéries symbiotiques. Dans le Sud de la France, les deux modes de reproduction coexistent en sympatrie. La thèse traite des questions soulevées par cette coexistence. Une étude de la distribution géographique et une analyse moléculaire des populations, ont montré l'existence d'un clone thélytoque très répandu. Cependan
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5

Bell, 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.

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This study is concerned with two strigeid genera which utilise fish as their second intermediate host and piscivorous birds as a definitive host, i.e. Apatemon (Apatemon) Sudarikov, 1959 and Ichthyocotylurus Odening, 1969. Although the lifecycle has been ascertained for most Ichthyocotylurus spp., confusion and disagreement still exist as to the constituent species, while all of the life-stages have been described for only a single member of the subgenus Apatemon (Apatemon). In order to clarify species membership to these taxa and indeed the taxonomic position of the subgenus Apatemon (Apatemo
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6

Mintsa, 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.

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Cette thèse a été réalisée dans le contexte de la réémergence de la schistosomose à Schistosoma mansoni (plathelminthe trématode) dans le Dhofar en Oman. Le travail est centré sur les interactions hôte-parasite et sur leurs conséquences sur la transmission du schistosome. Une première partie est consacrée à l’étude spatio-temporelle de la structure génétique des populations de Biomphalaria pfeifferi (mollusque gastéropode d’eau douce). Elle a été réalisée à l’aide de neuf marqueurs microsatellites sur 18 populations de mollusques. Les populations de B. Pfeifferi étudiées sont caractérisées par
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7

Owen, Sinclair Patrick. "The first epidemiological study on the prevalence of cardiopulmonary and gastrointestinal parasites in cats and dogs from the Algarve region of Portugal using the FLOTAC technique." Master's thesis, Universidade de Lisboa, Faculdade de Medicina Veterinária, 2017. http://hdl.handle.net/10400.5/14521.

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Dissertação de Mestrado Integrado em Medicina Veterinária<br>Although over the past decades various parasitologal surveys have been conducted in Portugal, at present scant information is available on the prevalence of clinically-relevant gastrointestinal and cardiopulmonary parasites in the Algarve. This study performed between February and April 2016 using the FLOTAC technique was undertaken to address this. Faecal samples were collected from 66 dogs and 76 cats > 6 months old from shelters in the region. Faecal forms of six different groups of endoparasites were detected, four of which with
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8

Isomursu, 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.

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Abstract Parasites are an inseparable part of the life of wild birds. They may cause morbidity, mortality or reduction in fecundity. Parasite distribution in hosts is typically not uniform and many host factors (e.g. age) may affect the pattern of distribution. Under certain conditions, parasites even have the potential to regulate the host population. The grouse species of Finnish forests — the capercaillie Tetrao urogallus , the black grouse Lyrurus tetrix and the hazel grouse Tetrastes bonasia — harbour several species of intestinal helminth parasites. The populations have fluctuated in cyc
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9

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.

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10

Goodhead, 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.

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Roughly one-third of cattle in sub-Saharan Africa are at risk of contracting "Nagana" - a disease caused by Trypanosoma parasites similar to those that cause human "Sleeping Sickness". Laboratory mice can also be infected by trypanosomes, and different mouse breeds show varying levels of susceptibility to infection, similar to what is seen between breeds of cattle. We have applied next-generation technologies to identify shared polymorphisms between susceptible mice, and annotated these for potential function alongside publicly available SNP data sets. By so doing, short lists of genes at the
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11

Fregonesi, Brisa Maria. "Prevalência de parasitas emergentes e reermergentes de veiculação hídrica em crianças que vivem com HIV/aids: ênfase paraGiardia spp. e Cryptosporidium spp." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/22/22133/tde-22012014-104630/.

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As doenças de veiculação hídrica são causadas, principalmente, por micro-organismos patogênicos de origem entérica. A partir da década de 1980, as enfermidades causadas por protozoários parasitas emergiram e reemergiram e se tornaram um problema de saúde pública com relevância na atualidade, especialmente para grupos populacionais mais vulneráveis, como pessoas que vivem com HIV/aids. Este trabalho teve por objetivo avaliar a prevalência de parasitas emergentes e reemergentes em crianças que vivem com HIV/aids atendidas no HCFMRP-USP e os condicionantes socioambientais envolvidos. Foram
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12

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.

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Une des contraintes biotiques majeures de la riziculture de bas-fond au nord du Togo est l’adventice parasite Rhamphicarpa fistulosa (Hochst.) Benth. Afin d’évaluer les options stratégiques pour contrôler efficacement R. fistulosa, notre étude a été conduite avec comme principaux objectifs : 1) l’identification de la répartition de R. fistulosa et l’étude des facteurs qui favorisent son infestation, 2) l’étude de l’impact des niveaux d’infestation sur la flore adventice du riz, et 3) la caractérisation des interactions hôte-parasite et de leurs impacts sur le développement de l’hôte et les per
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13

Le, Brun Nathalie. "Spécificité des relations hôtes-parasites : le modèle Cyprinidae-Diplozoon." Montpellier 2, 1988. http://www.theses.fr/1988MON20055.

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La spécificité parasitaire est abordée à travers les modèles fournis par 4 espèces du genre Diplozoon, parasite branchial de Cypirindae. Plusieurs populations de Diplozoon sont étudiées et comparées dans le sud de la France et en Suisse (lac de Neuchatel)
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14

Carvalho, Íris Teixeira. "Rastreio de parasitas gastrointestinais e pulmonares em gatos de gatis nos distritos de Lisboa e Setúbal, Portugal." Master's thesis, Universidade de Lisboa, Faculdade de Medicina Veterinária, 2017. http://hdl.handle.net/10400.5/13937.

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Dissertação de Mestrado Integrado em Medicina Veterinária<br>Os gatos são hospedeiros de diversos parasitas, sendo reconhecido o potencial zoonótico de alguns. O risco de transmissão aos humanos assumiu particular relevância nos últimos anos, devido à crescente popularidade do gato como animal de estimação. No entanto, são raros os estudos efetuados em Portugal sobre este tema, motivo pelo qual se procedeu a uma avaliação epidemiológica da fauna parasitológica gastrointestinal e pulmonar, em gatos mantidos em gatis, nos distritos de Lisboa e Setúbal. Para o efeito, recolheram-se 260 amostras
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15

browne, Joanna. "Parasites of Jellyfish in Eastern Australia." Thesis, Griffith University, 2015. http://hdl.handle.net/10072/367791.

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Parasites are a major component of the Earth’s biota, yet are often overlooked and their importance underestimated. They affect nearly all organisms and can potentially regulate the populations of their hosts. Jellyfish are abundant members of the zooplankton community and are renowned for their ability to form large blooms. Jellyfish host a large diversity of parasites. Some of these parasites (e.g. hyperiid amphipods and parasitic anemones) use jellyfish as the sole host in their life cycle, whilst others (e.g. digenean trematodes and cestodes) use jellyfish as an intermediate host between o
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16

Prior, Kimberley Faith. "The evolutionary ecology of circadian rhythms in malaria parasites." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/29562.

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Biological rhythms are thought to have evolved to enable organisms to organise their activities according to the Earth’s predictable cycles, but quantifying the fitness advantages of rhythms is challenging and data revealing their costs and benefits are scarce. More difficult still is explaining why parasites that exclusively live within the bodies of other organisms have biological rhythms. Rhythms exist in the development and traits of parasites, in host immune responses, and in disease susceptibility. This raises the possibility that timing matters for how hosts and parasites interact and,
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17

Williams, 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.

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The invisible interactions between parasites and their hosts are important elements of the ecology and biology of host populations. Parasites can shape the morphology, distribution, physiology and behaviour of individual hosts - some commonly studied host-parasite interactions often involve gastropods and trematodes. Trematodes can have detrimental effects on their snail hosts, yet many such relationships are relatively unknown. One such relationship is that of the mud whelks, Velacumantus australis, many of which are infected by several species of parasitic trematode. Australian estuaries and
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18

Rossanigo, Carlos Esteban. "Rôle de l'eau et de la température sur les taux de développement des nématodes parasites du tractus digestif des ruminants." Montpellier 2, 1992. http://www.theses.fr/1992MON20293.

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Les conditions climatiques ont un role preponderant sur la repartition geographique et temporelle des differentes especes de nematodes parasites des ruminants. Sur un exemple tire du parasitisme des bovins du centre-ouest d'argentine, temperature et pluviometrie contribuent a expliquer les niveaux d'infestation par les principaux genres. Un travail plus experimental est developpe en vue d'estimer le role de l'eau a proximite immediate des ufs et jeunes larves des nematodes (dans les feces), avec ou sans celui de la temperature, sur la partie du cycle de developpement allant de l'uf a la larve
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19

Chartier, Christophe. "Epidémiologie de l'infestation helminthique chez les bovins en Ituri (Haut-Zai͏̈re)." Montpellier 2, 1989. http://www.theses.fr/1989MON20253.

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La faune helminthique des bovins de l'ituri (haut-zaire), riche de trente especes parasites differentes, participe a la fois des zones tropicales d'afrique de l'est, des regions humides et des zones d'altitude. L'etude de la distribution geographique des helminthes fait apparaitre, pour les trematodes (fasciola gigantica, schistosoma bovis et dicrocoelium hospes), une importante disparite liee a la repartition des mollusques hotes intermediaires. Les nematodes ont, au contraire, une distribution plus homogene. La mesure du parasitisme helminthique des jeunes animaux, met en evidence la chronol
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20

Nkollo, Jean-Marie Faustin. "Les parasitoses intestinales au Cameroun." Bordeaux 2, 1992. http://www.theses.fr/1992BOR2P045.

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21

Duranton, Christelle. "Comparaison de l'infestation par Oestrus ovis (Linné, 1761) chez la chevre et le mouton." Toulouse 3, 1997. http://www.theses.fr/1997TOU30171.

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Strus ovis (linnaeus, 1761) est un parasite frequent chez le mouton et la chevre de nombreux pays mediterraneens et tropicaux, responsable d'une maladie (l'strose) due a la presence et au developpement de larves dans les cavites nasales de l'hote. Une etude bibliographique et une enquete epidemiologique menee a l'abattoir de pezenas ont montre que la prevalence et l'intensite de l'infestation sont plus importantes chez le mouton que chez la chevre naturellement infestes par strus ovis. Nous avons infeste experimentalement des chevreaux et des agneaux par des larves de premier stade d'strus ovi
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22

Borghesan, Tarcilla Corrente. "Diversidade e filogenia de tripanossomatídeos parasitas de dípteros." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/42/42135/tde-03062014-105719/.

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A família Trypanosomatidae compreende parasitas obrigatórios de vertebrados, plantas e invertebrados, as espécies exclusivas de insetos infectam principalmente dípteras e hemípteras. Nós revisamos a taxonomia de Herpetomonas e tripanossomatídeos de insetos que abrigam simbionte (SHT), comparando tripanossomatídeos da América do Sul e África. As filogenias revelaram duas novas espécies e possibilitou revalidar os gêneros Strigomonas e Angomonas. As análises filogenéticas revelaram três novas espécies de endossimbiontes proteobacteriano e apoiam a história evolutiva convergente entre hospedeiros
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23

Inácio, Sandra Valéria. "Validação diagnóstica para a detecção de Cryptosporidium spp. em bovinos /." Araçatuba, 2016. http://hdl.handle.net/11449/133993.

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Orientador: Katia Denise Saraiva Bresciani<br>Banca: Simone Baldini Lucheis<br>Banca: Valéria Maria Savoya da Silva<br>Banca: Mônica Regina Vendrame Amarante<br>Banca: Silvia Helena venturoli Perri<br>Resumo: A criptosporidiose, tanto humana como animal, tem distribuição cosmopolita. Esse parasito ocasiona diarreia em bezerros, retardo no crescimento, mortalidade e consequentes perdas econômicas. Nós realizamos a viabilização, desenvolvimento, avaliação e validação intralaboratorial de uma nova técnica parasitológica para a análise em microscopia óptica de oocistos de Cryptosporidium spp., den
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24

PEREIRA, Aldenice Nazar? Silva. "A comunidade parasit?ria da Trilha, Mullus argentinae Hubbs & Marini, 1933 (Perciformes, Mullidae): aspectos taxon?micos e seu uso para a discrimina??o de estoques populacionais." Universidade Federal Rural do Rio de Janeiro, 2012. https://tede.ufrrj.br/jspui/handle/jspui/1691.

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Submitted by Jorge Silva (jorgelmsilva@ufrrj.br) on 2017-05-26T20:25:05Z No. of bitstreams: 1 2012 - Aldenice de Nazar? Silva Pereira.pdf: 1725747 bytes, checksum: dc10ecd0699041a155de6f501045a97a (MD5)<br>Made available in DSpace on 2017-05-26T20:25:05Z (GMT). No. of bitstreams: 1 2012 - Aldenice de Nazar? Silva Pereira.pdf: 1725747 bytes, checksum: dc10ecd0699041a155de6f501045a97a (MD5) Previous issue date: 2012-03-01<br>CNPq<br>Previous studies of the parasitic fauna of the goatfish (Mullus argentinae) from Brazil and Argentina show a significant diversity of species and suggest that
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Campbell, 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.

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The Microsporidia form a phylum of obligate intracellular parasites known to cause disease in humans and a diverse range of economically important animal species. Once classified as ‘primitive’ eukaryotes, it is now recognised that the peculiarities of microsporidian genomics and cell biology are, in fact, the consequence of extreme reduction allowed by an intimate relationship with the host cell. Excluding survival as an extracellular spore, microsporidia are in direct contact with the host throughout their developmental lifecycle, from entry to egress. Host cell manipulations have been descr
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O'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.

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There is a growing interest in the nature of parasite-host interactions, the role these relationships play in ecological communities, and how human activities alter these associations. Furthermore, because inference about these interactions is usually gained by methods of statistical hypothesis testing, additional importance should be placed on the analysis and interpretation of parasite-host interactions. In this dissertation I address these ideas in three separate but interrelated studies with the three following questions: 1) How do two parasites with complex life-cycles alter the behavi
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Brown, S. "Social evolution in parasites." Thesis, University of Cambridge, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597008.

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The ability of parasites to manipulate their hosts is the major empirical theme of this thesis, in particular the problem of cooperation among parasites that host manipulation entails. Contributing to host manipulation is likely to bear a cost to the individual, while the benefits will be felt by every conspecific parasite (and others) within the host. I develop in Chapter Two a game-theoretical model of parasite-induced host manipulation, which focuses on co-operative interactions between individuals and a larger group. In Chapters Three and Four I consider two macroparasitic case-studies. Ch
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Dale, Denver Dudley Stanton. "Parasites and host nutrition." Thesis, University of Oxford, 1993. http://ora.ox.ac.uk/objects/uuid:5bc8aebc-fcfa-4301-8d04-4ebc89fb1c8a.

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29

Vankeuren, Jody L. "Parasites Predators and Symbionts." Kent State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=kent1619475426952694.

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30

Steinfelder, Svenja. "Immune modulation by parasites." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2007. http://dx.doi.org/10.18452/15682.

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Die Infektion mit Schistosoma mansoni resultiert in einer Th2-Immunantwort mit Eosinophilie und erhöhtem IgE-Titer, wobei der wasserlösliche Extrakt der S. mansoni Eier (SEA) ausreicht um diese Reaktion auszulösen. In der vorliegenden Arbeit konnte demonstriert werden, dass sich IL-4-produzierende CD4+ T-Lymphozyten in Zellkulturen mit SEA-konditionierten Dendritischen Zellen (DCs) trotz gleichzeitig vorkommenden IFN-gamma entwickeln und SEA die Expression von Faktoren in DCs, die üblicherweise mit einer Th1-Antwort einhergehen, auf Transkriptions- und Proteinebene selektiv hemmt. Um den Fakto
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Buttar, Birpal Singh. "Effect of thermal and ensilation treatments on viability of Taenia hydatigena eggs." Pullman, Wash. : Washington State University, 2010. http://www.dissertations.wsu.edu/Dissertations/Spring2010/B_Buttar_1041310.pdf.

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Pereira, 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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Submitted by Renata Lopes (renatasil82@gmail.com) on 2016-12-16T12:33:44Z No. of bitstreams: 1 felipebisaggiopereira.pdf: 1115383 bytes, checksum: c4128dd85e239865ce346d0569b37b98 (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2016-12-19T12:34:46Z (GMT) No. of bitstreams: 1 felipebisaggiopereira.pdf: 1115383 bytes, checksum: c4128dd85e239865ce346d0569b37b98 (MD5)<br>Made available in DSpace on 2016-12-19T12:34:46Z (GMT). No. of bitstreams: 1 felipebisaggiopereira.pdf: 1115383 bytes, checksum: c4128dd85e239865ce346d0569b37b98 (MD5) Previous
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Leducq, Régine. "Echinococcose alvéolaire : migration et différenciation dans l'hôte intermédiaire expérimental. Aspects morphologiques et biochimiques." Montpellier 2, 1992. http://www.theses.fr/1992MON20181.

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Dans le cadre des interactions heterospecifiques durables, une etude des relations hote-parasite est realisee a partir du modele metacestode e. Multilocularis/hote intermediaire experimental (la gerbille de chine meriones unguiculatus). Dans un premier temps, les parametres influencant la dissemination de l'echinocoque (en tant que population clonale) sont etudies au travers de differents protocoles d'infestations secondaires. Les differents types de formes larvaires a l'origine des migrations dans l'hote sont decrits ainsi que les voies de migration preferentiellement empruntees. Une attentio
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Mottuel, de Brauer Christabel. "Les parasites dans les boues résiduaires des stations d'épuration." Paris 5, 1992. http://www.theses.fr/1992PA05P153.

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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.

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Most, if not all, animals will at some stage in their lives encounter parasites. Some of the most widespread and abundant parasites belong to the Class Trematoda. Trematodes often have a substantial negative impact on individual intermediate host ecology. In this thesis, I investigate ecological and evolutionary consequences of the interaction between the microphallid trematode, Maritrema novaezealandensis, and its intermediate snail and crustacean hosts. Parasites often show a heterogeneous spatial distribution pattern in natural animal host populations. In this study, factors determining t
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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.

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Les Pimplinae sont une des sous-familles d’Ichneumonidae dont les modalités de relation hôtes-parasitoïdes sont les plus diversifiées et dont la biologie est parmi les mieux connues. Des hypothèses phylogénétiques ayant déjà été établies sur des bases morphologiques pour la sous-famille, nous avons (1) confirmé ces hypothèses à l’échelle générique à partir de données moléculaires originales basées sur l‘étude des ADNr 28S,16S et du CO1; (2) approfondi les relations de parenté au sein du groupe de genres Polysphincta ; (3) établi des hypothèses sur l’évolution du parasitisme au sein du groupe.
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Tabouret, 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.

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38

Nno, 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.

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Le succès reproducteur d'un parasitoïde dépend en grande partie de sa capacité à infester son hôte et à s’y développer. Les parasites sont généralement capables d’éviter, de neutraliser ou de détourner la réponse immunitaire innée de leur hôte. Le processus le plus répandu est la production de facteurs immunosuppresseurs bloquant cette réponse, ou de facteurs toxiques provoquant la mort des cellules de défense. Ce travail de thèse porte sur la comparaison des mécanismes et des agents de la virulence chez les Hyménoptères braconides du genre Asobara. L’étude a porté sur deux espèces, A. Japonic
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39

Badets, 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.

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La théorie synthétique de l'évolution attribue aux processus du développement une nouvelle dimension dans notre compréhension de l'histoire de la vie. Comme les forces de sélection naturelles et sexuelles, les forces du développement pourraient favoriser ou contraindre la diversification des espèces. Par le jeu d'une combinatoire génétique et par une étonnante capacité d'interaction avec l'environnement, le développement d'un individu pourrait donc être dévié dans sa trajectoire afin d'augmenter survie et reproduction. Ainsi, le développement qui permet l'expression d'une information (génétiqu
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40

Segonds-Pichon, Anne. "L'interaction hôte-parasite chez le chevreuil (Capreolus capreolus) : étude éco-épidémiologique de la relation entre les nématodes gastro-intestinaux et pulmonaires et la condition corporelle de l'hôte dans des populations contrastées." Lyon 1, 2001. http://www.theses.fr/2001LYO10091.

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L'objectif de notre étude a été d'apporter des connaissances nouvelles sur la dynamique de la relation hôte-parasite dans le cas particulier du chevreuil et des nématodes qu'il héberge. Elle s'est déroulée sur 5 années et a permis la collecte et l'analyse coprologique puis statistique de 1607 prélèvements provenant de 7 populations de chevreuils contrastées sur le plan du milieu et de la densité relative aux ressources. L'helminthofaune observée correspond aux espèces de nématodes digestifs et pulmonaires généralement retrouvées en France. Après avoir établi la validité de la méthode coprologi
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Alghanmi, Maimonah. "Identification and therapeutic application of molecular parallels between parasites, parasitic vectors and snake venom." Thesis, University of Liverpool, 2014. http://livrepository.liverpool.ac.uk/17797/.

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Neglected tropical diseases (NTDs) are a group of conditions that exert disability and poverty on populations that comprise the world’s poorest billion people. These conditions, although caused by different organisms and cause distinct disease, they share geographical distribution within tropical regions, occur during similar ecological conditions and most importantly have similar biological mechanisms that are utilized to facilitate the pathology of these diseases. Proteolytic enzymes like proteases are used in many biological mechanisms such as, migration through tissue and cellular compartm
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Taylor, Mae. "Spiral Valve Parasites of Selected Tropical Pelagic Elasmobranchs and Internal Parasites of Mesopelagic Teleosts." NSUWorks, 2010. http://nsuworks.nova.edu/occ_stuetd/199.

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Natural mortality is a poorly known aspect of fisheries biology, despite its importance in stock assessments and population analysis. Of the many potential sources of mortality and morbidity in fishes, the effect of internal parasites is perhaps the least studied. Intestinal parasites may inhibit nutrient uptake as well as stimulate an inflammatory response in fish. Intestinal parasites of several tropical pelagic elasmobranchs, including silky and night sharks (Carcharhinus falciformis and C. signatus), the pelagic stingray (Pteroplatytrygon violacea), and mesopelagic fishes including sailfin
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43

Mendonça, Rafael Paranhos de. "Atividade endectocida de uma nova alternativa terapêutica (S-cifenotrina, Butóxido de piperonila, D-tetrametrina e Ivermectina) em cães /." Jaboticabal : [s.n.], 2007. http://hdl.handle.net/11449/95944.

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Orientador: Alvimar José da Costa<br>Banca: Gilson Pereira de Oliveira<br>Banca: Luciano Melo de Souza<br>Resumo: Utilizando-se de delineamentos experimentais apropriados, foi avaliada a atividade endectocida de uma nova associação medicamentosa, composta de dois piretróides (Scifenotrina e D-tetrametrina), butóxido de piperonila e ivermectina. Quatro experimentos foram conduzidos para avaliação terapêutica da nova associação, comparativamente à formulações adquiridas no mercado. Para avaliação carrapaticida e pulicida foram conduzidos dois experimentos. No primeiro ensaio, 21 cães naturalment
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Renteria, Flores Axel. "Novel drugs against protozoan parasites." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116979.

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Cryptosporidium parvum and Trypanosoma brucei are two protozoan parasites that can cause life-threatening illnesses in humans. Over 70 million people on the African continent are at risk of contracting T.brucei. In the case of C.parvum, infections are cosmopolitan, and a major problem is that it can be acquired very easily and requires only an infectious dose of 10 oocysts to cause the illness. If released in the public water supplies, C.parvum can endanger entire cities. This is one reason why C.parvum is categorized as a Class B bioterrorist weapon. Despite the threat C.parvum poses and the
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Halliday, Aileen. "Ruminant immunity to abomasal parasites." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/8804.

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The studies submitted herein have contributed to our understanding of ruminant immunology, host-parasite interactions during ruminant infection with nematode parasites, and potential vaccine strategies to combat parasitic gastroenteritis (PGE). PGE of sheep and cattle, caused by T. circumcincta and O. ostertagia respectively, is a major problem for the global farming industry both in terms of productivity and animal welfare. To date control of these parasites has relied on the use of anthelmintic drugs however the emergence of widespread anthelmintic resistance is driving the search for altern
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Mackinnon, Margaret J. "Evolutionary genetics of malaria parasites." Thesis, University of Edinburgh, 1998. http://hdl.handle.net/1842/15243.

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Two empirical studies on parasite virulence using the laboratory model of the rodent malaria parasite, <I>Plasmodium chabaudi,</I> in inbred mice, were conducted. In the first, the average virulence and transmissibility in eight parasite clones obtained from the wild were measured over four replicate experiments. Large amounts of genetic (between-clone) variation in virulence and transmissibility were observed. Virulence was strongly correlated, both phenotypically and genetically, to population growth rate (parasitaemia) and less strongly correlated to transmissibility. These results provide
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Servel, Grégory. "Effets parasites dus aux interconnexions." Montpellier 2, 2001. http://www.theses.fr/2001MON20037.

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Alkhaldi, Abdulsalam Abdulhadi. "Drug development against kinetoplastid parasites." Thesis, University of Glasgow, 2012. http://theses.gla.ac.uk/3637/.

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Human African trypanosomiasis and leishmaniasis are caused by parasites belonging to the genera Trypanosoma and Leishmania, respectively. Significant numbers of people are affected by these diseases worldwide, which are fatal if untreated. Animals can also be infected, posing agricultural and economic hindrances, especially in poor countries. Although chemotherapy can be used for treatment, many problems are associated with it, including drug toxicity, resistance, lack of guaranteed supply, and high treatment cost. Therefore, there is an urgent need for new treatment approaches. Here, we aim t
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Brewster, 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/.

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A checklist of parasites of freshwater fish in the UK is an important source of information concerning hosts and their distribution for all aspects of scientific research. An interactive, electronic, web-based databse, Aquatic Parasite Information has been designed, incorporating all freshwater and brackish species of fish, parasites, taxonomy, synonyms, authors and associated hosts, together with records for their distribution. One of the key features of Aquatic Parasite Information is this checklist can be updated. Interrogation of Aquatic Parastie Information has revealed that some parasite
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Lester, 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/.

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Faecal egg count (FEC) directed targeted anthelmintic treatment programmes and regular efficacy testing using the faecal egg count reduction test (FECRT) have been advocated to support evidence-based helminth control in horses. One major hurdle to their widespread application is that horse owners/managers and those that prescribe anthelmintics may have insufficient knowledge on which to base evidence-based protocols. The ultimate aim of this study was to create a framework for a decision support system (DSS) to support evidence-based helminth control in horses. To create the framework, the dia
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