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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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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.
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Showing 81 to 88 of 88 (0.042 seconds)Spelling suggestions: "subject:"trematode"" "subject:"trematodes""
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Some hemiurid trematodes of marine fishes of CaliforniaNahhas, Fuad Michael 01 January 1960 (has links) (PDF)
The following seven species of hemiurid trematodes, some with new host records, are reported in this study: Dissosaccus laevis, Genolinea laticauda, Lecithaster salmonis, Parahemiurus merus, Sterrhurus exodicus, Sterrhurus monticelli and Tubulovesicula lindbergi. Dissosaocus laeyis and Sterrhurus monticelli are reported for the first time from the West Coast of North America.
Genolinea oncorhynohi Adams and Margolis 1958 is placed in synonymy with Genolinea laticauda Manter 1925. Keys for Genolinea and Tubulovesicula species, modified from Manter (1954) are included. Two tables, one summarizing the hemiurids reported from the West Coast of North America, the other a summary of hemiurids from Monterey Bay, California, encountered in this study, are also included.
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| 82 |
The structure and function of the attachment organs in Cotylurus variegatus Creplin, 1825 (Odening, 1969) (Trematoda: Strigeida).Haight, Murray Ellis 10 1900 (has links)
<p> Previous studies dealing with the structure and function of the attachment organs in the strigeid trematodes have neglected to describe the processes involved in the formation of attachment. A knowledge of these processes is necessary to promote the understanding of the host-parasite relationship. </p> <p> In the present study, specimens of developing Cotylurus variegatus were examined using light and electron microscopic techniques. It seemed relevant to consider not only the sequence of attachment events, but the growth and structure of the attachment organs in relation to the total parasite body growth and structure. This of course, has led to considerations of the reputative functions of these structures. </p> / Thesis / Master of Science (MSc)
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| 83 |
Detection of the parasite Ribeiroia ondatrae in water bodies and possible impacts of malformations in a frog hostHuver, Johannes Richard 04 July 2013 (has links)
This study devised a method to detect Ribeiroia ondatrae (class Trematoda) in water-bodies using environmental DNA (eDNA) collected from filtered water samples from selected ponds in the USA and Canada. Species-specific PCR primers were designed to target the Internal Transcribed Spacer-2 (ITS-2) region of the parasite’s genome. The qualitative PCR method was 70% (n=10) accurate in detecting R. ondatrae in ponds previously found to contain the parasite, while the qPCR method was 88.9% (n=9). To examine how the retinoic acid (RA) pathway gene expression may be perturbed during R. ondatrae infections, leading to limb development abnormalities in the wood frog (Lithobates sylvaticus). Multiple sequence alignments were used to design degenerate PCR primers to eight RA biosynthesis genes, but only two gene fragments were identified using this approach. Without effective primer sets it was not possible to measure changes in gene expression in infected frogs.
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| 84 |
Detection of the parasite Ribeiroia ondatrae in water bodies and possible impacts of malformations in a frog hostHuver, Johannes Richard 04 July 2013 (has links)
This study devised a method to detect Ribeiroia ondatrae (class Trematoda) in water-bodies using environmental DNA (eDNA) collected from filtered water samples from selected ponds in the USA and Canada. Species-specific PCR primers were designed to target the Internal Transcribed Spacer-2 (ITS-2) region of the parasite’s genome. The qualitative PCR method was 70% (n=10) accurate in detecting R. ondatrae in ponds previously found to contain the parasite, while the qPCR method was 88.9% (n=9). To examine how the retinoic acid (RA) pathway gene expression may be perturbed during R. ondatrae infections, leading to limb development abnormalities in the wood frog (Lithobates sylvaticus). Multiple sequence alignments were used to design degenerate PCR primers to eight RA biosynthesis genes, but only two gene fragments were identified using this approach. Without effective primer sets it was not possible to measure changes in gene expression in infected frogs.
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| 85 |
Helminth parasites of sheep and goats in Eastern Ethiopia : epidemiology, and anthelmintic resistance and its management /Menkir Mekonnen, Sissay, January 2007 (has links) (PDF)
Diss. (sammanfattning) Uppsala : Sveriges lantbruksuniv., 2007. / Härtill 4 uppsatser.
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| 86 |
Perorální infekce ptáků a savců neuropatogenní motolicí Trichobilharzia regenti / Peroral infections of birds and mammals with the neuropathogenic fluke Trichobilharzia regentiPech, Václav January 2013 (has links)
Migration within the body of an infected host is one of the most important parts in the life cycle of flukes, including schistosomes. Migration of avian and mammalian visceral schistosomes has been a quite well studied topic (Haas a Haeberlein, 2009), which became more attractive after the discovery of T. regenti, an avian schistosome which is able to migrate through the nervous tissues of infected birds and mammals as well. Migration of T. regenti and T. szidati schistosomula within the definitive (duck) and the accidental (mouse) hosts is the main topic of the diploma thesis. This work continues with the research of K. Blažová (Faculty of Science, Charles University in Prague) who studied migration of T. regenti within the definitive hosts infected perorally with cercariae or hepatopancreases of the infected intermediate snail, Radix lagotis (unpblished). She proved that T. regenti schistosomula are able to use the central nervous system for migration to the nasal mucosa of infected birds. In our work, we focused on the early phase of migration within the perorally infected birds and mice. Invasion of esophagus by T. regenti cercariae in vitro is not conditioned by secretion of glandular products, including cathepsin B2 of T. regenti (TrCB2). Activity of TrCB2 against mucins, the main components...
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| 87 |
Endohelminths from six rare species of turtles (Bataguridae) from Southeast Asia confiscated by international authorities in Hong Kong, ChinaMurray, Rebecca Ann 30 September 2004 (has links)
Specimens of 6 species of threatened, vulnerable, and endangered turtles (Cuora amboinensis, Cyclemys dentata, Heosemys grandis, Orlitia borneensis, Pyxidea mouhotii, and Siebenrockiella crassicollis) belonging to family Bataguridae, were confiscated in Hong Kong, China on 11 December 2001 by international authorities. Endohelminth studies on these turtle species are scarce, and this study provided a rare opportunity to examine a limited number of specimens for endohelminths. Ten different parasite species were collected and there were 16 new host records. This is the first record of a parasite from P. mouhotii. The parasite prevalences found in this study provide a basis for a better understanding of the phylogenetic relationships of the family Bataguridae to other families, especially Testudinidae. Based on known life cycles, parasites found provided an indication of food preferences of these 6 turtle species that support previous studies of the turtles' feeding habits. However, the results of the parasite survey from O. borneensis provided additional feeding habit information. The list of endohelminths herein is intended to provide a foundation for future parasite studies of the 6 species of Asian turtles.
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| 88 |
Endohelminths from six rare species of turtles (Bataguridae) from Southeast Asia confiscated by international authorities in Hong Kong, ChinaMurray, Rebecca Ann 30 September 2004 (has links)
Specimens of 6 species of threatened, vulnerable, and endangered turtles (Cuora amboinensis, Cyclemys dentata, Heosemys grandis, Orlitia borneensis, Pyxidea mouhotii, and Siebenrockiella crassicollis) belonging to family Bataguridae, were confiscated in Hong Kong, China on 11 December 2001 by international authorities. Endohelminth studies on these turtle species are scarce, and this study provided a rare opportunity to examine a limited number of specimens for endohelminths. Ten different parasite species were collected and there were 16 new host records. This is the first record of a parasite from P. mouhotii. The parasite prevalences found in this study provide a basis for a better understanding of the phylogenetic relationships of the family Bataguridae to other families, especially Testudinidae. Based on known life cycles, parasites found provided an indication of food preferences of these 6 turtle species that support previous studies of the turtles' feeding habits. However, the results of the parasite survey from O. borneensis provided additional feeding habit information. The list of endohelminths herein is intended to provide a foundation for future parasite studies of the 6 species of Asian turtles.
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