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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

The geographic distribution of ticks in the eastern region of the Eastern Cape Province

Nyangiwe, Nkululeko. January 2007 (has links)
Thesis (MSc. (Veterinary Tropical Diseases)--University of Pretoria, 2007. / Includes bibliographical references.

Oviposition habits of the tick Dermacentor parumapertus Neumann and factors influencing egg development

Jorgensen, Clive D. 01 May 1957 (has links)
This paper includes data concerning the influence of relative humidity, temperature, and percentage of engorgement on the pre-oviposition period, oviposition period, post-oviposition period, and incubation period of the tick Dermacentor parumapertus Neumann. The influence of the percentage of engorgement on the oviposition period, oviposition rate, and egg number is considered. Data on the disposition and number of eggs in nature are discussed.

Acaricide resistance profiles of single and multi-host ticks in commercial and communal farming areas in the Eastern Cape and North-West Provinces of South Africa

Mekonnen, Sileshi. January 2002 (has links)
Thesis (MSc (Veterinary Sciences))--University of Pretoria, 2002. / Includes bibliographical references.

The extent of acaricide resistance in the eastern region of the Eastern Cape Province

Ntondini, Zoleka. January 2009 (has links)
Thesis (MSc (Veterinary Tropical Diseases, Veterinary Science))--University of Pretoria, 2009. / Includes bibliographical references. Also available in print format.

Microanatomical study on the eyes of the lone star tick and the screwworm fly with related electrophysiological studies

Phillis, William Avery, January 1975 (has links)
Thesis--University of Florida. / Description based on print version record. Typescript. Vita. Includes bibliographical references (leaves 144-155).

Dinâmica da vitelogêneses de carrapatos Amblyomma triste (Koch, 1844) (Acari: Ixodidae)

Oliveira, Patrícia Rosa de [UNESP] 20 February 2006 (has links) (PDF)
Made available in DSpace on 2014-06-11T19:22:59Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-02-20Bitstream added on 2014-06-13T20:49:41Z : No. of bitstreams: 1 oliveira_pr_me_rcla.pdf: 1932161 bytes, checksum: f820087f383a5435368c32d73091195c (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / O presente estudo apresenta a análise morfológica, histológica e ultraestrutural do ovário bem como a dinâmica da vitelogênese de fêmeas de carrapatos Amblyomma triste. O ovário dessa espécie é do tipo panoístico, não possuindo, portanto, células nutridoras nem foliculares. O ovário é composto por ovócitos que estão presos à parede do ovário, camada única de células epiteliais, através do pedicelo, estrutura celular com função de sintetizar e fornecer substâncias para o desenvolvimento dos mesmos. Os ovócitos foram identificados e classificados em quatro estágios diferentes de desenvolvimento. A classificação foi realizada baseada na presença de quatro características morfológicas: aspecto citoplasmático; localização da vesícula germinal; presença, quantidade e constituição dos grânulos de vitelo e presença de cório. Nos ovócitos de A. triste ocorre a síntese endógena e principalmente exógena dos elementos do vitelo. Em carrapatos A. triste, os lipídios dos ovócitos têm origem: a) exógena, em todos os estágios, uma vez que os elementos são captados da hemolinfa via superfície do ovócito e/ou provenientes das células do pedicelo e, b) endógena, que ocorre somente nos ovócitos III e IV. As proteínas do vitelo dos ovócitos de A. triste têm origem: a) exógena, nos ovócitos II, III e IV, via células do pedicelo que atuariam como fornecedoras deste elemento e também por meio da captação da hemolinfa pelo próprio ovócito e, b) endógena, nos ovócitos IV. Já os polissacarídios teriam origem a partir de duas fontes exógenas, a primeira com a produção e/ou transporte desse elemento via células do pedicelo, e a segunda, por meio da captação da hemolinfa via membrana do ovócito. No presente trabalho, a função do pedicelo como fornecedor de elementos para os ovócitos durante a vitelogênese fica estabelecida nessa espécie de carrapatos. / The present study presents the morphological, histological and ultrastructural analysis as well as the dynamics of vitellogenesis in females of the tick Amblyomma triste. The ovary of this species is of the panoistic type, not presenting nurse nor follicular cells. The ovary is composed of oocytes which remain attached to wall of the ovary (single layer of epithelial cells) through the pedicel, a cellular structure responsible for synthesizing and providing substances to oocytes, promoting their development. The oocytes had been identified and classified into four different developmental stages. The classification was carried out based on the presence of four morphologic characteristics: cytoplasm appearance; site of the germ vesicle; presence, quantity and constitution of the yolk granules and presence of chorium. In the oocytes of A. triste occur the endogenous synthesis and mainly exogenous incorporation of yolk elements. The lipids have two different origin: a) exogenous, in all the oocytes, captured from the hemolymph through the oocyte surface and produced by pedicel cells and b) endogenous, only stages III and IV. The proteins have origin: a) exogenous, in the oocytes II, III e IV, where the pedicel cells contribute with the protein supply for the yolk constitution and also through the capture of this element from the hemolymph by the oocyte and, b) endogenous, in the oocytes IV. The polysaccharides would have two exogenous sources: the production and transportation of this element through the pedicel cells; and the capture of the hemolymph through the oocyte plasmic membrane. The present study determines the role of the pedicel as a provider of yolk elements to these tick species oocytes.

The role of Ornithodoros erraticus in the epidemiology of African swine fever in Portugal

Boinas, Fernando Jorge Silvano January 1994 (has links)
No description available.

Ticks of the genus Haemaphysalis in the western United States

Merino, Joe M. 02 May 1967 (has links)
Two species of Haemaphysalis occurring in the western United States were studied with respect to geographical distribution, seasonal occurrence, host-parasite association and external anatomy and morphology. H. leporispalustris is widely distributed in the west. Abundant records for some states are lacking and should be provided to extend the knowledge of this tick's distribution.

The biology and vector potential of North American Haemaphysalis ticks

Javidpour, Iraj, January 1965 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1965. / Abstracted in Dissertation abstracts, v. 25 (1965) no. 10, p. 5533. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Investigating genetic population substructure of an Australian reptile tick, Bothriocroton hydrosauri, using highly polymorphic microsatellite markers

Guzinski, Jaromir Anthony. January 2008 (has links)
Thesis (Ph.D.)--Flinders University, School of Biological Sciences. / Typescript bound. Includes bibliographical references: (leaves 135-157) Also available online.

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