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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.
21

Pathology of schistosome infection in mice and vector snails

Soomro, Noor Mohammad January 1996 (has links)
No description available.
22

The selection of sheep resistant to nematode infection

Hughes, Suzanne January 1995 (has links)
No description available.
23

Nematodes Parasitic in Suncus Murinus and Bandicota Nemorivaga from Formosa

Sapong, Debra January 1963 (has links)
No description available.
24

Biological studies on the hemoflagellates of Oregon marine fishes and their potential leech vectors

Burreson, Eugene Michael 08 April 1975 (has links)
Of 2,122 marine fishes belonging to 36 species collected in the vicinity of Newport, Oregon, 541 belonging to 8 species were infected with hemoflagellates. Four species of trypanosomes and three species of cryptobias were found in offshore fishes, but no hemoflagellates were observed in fishes from Yaquina Bay. Trypanosoma pacifica was found in 177 of 1,102 Parophrys vetulus, 3 of 84 Citharichthys sordidus, and 1 of 35 Lyopsetta exilis, and survived in 10 other species after intraperitoneal injection. The host-specificity observed in nature was probably the result of selective feeding by the leech vector, possibly Oceanobdella sp. or Johanssonia sp. Division stages of T. pacifica were observed in the fish host and described. The growth rate of juvenile P. vetulus injected with T. pacifica was less than that of uninfected individuals for a 10 week period, after which the growth rates of the two groups were equivalent. Trypanosoma gargantua was found in 3 of 7 Raja binoculata and the vector was shown to be the leech Orientobdella sp. Two unidentified trypanosomes were observed, one from 21 of 1,102 P. vetulus, 24 of 303 Eopsetta jordani, and 6 of 61 Microstomus pacificus, and the other from 4 of 35 L. exilis. A small, active cryptobiid was found in 106 of 303 E. jordani, 51 of 1,102 P. vetulus, and a similar but larger flagellate in 9 of 35 L. exilis. After intraperitoneal injection flagellates from E. jordani did not survive in P. vetulus, but did survive in other flatfishes; flagellates from L. exilis survived in P. vetulus, but not E. jordani, indicating the possible presence of two species, one in E. jordani and one in P. vetulus and L. exilis. A larger, sluggish cryptobiid was found in 134 of 1,102 P. vetulus. An extremely large cryptobiid, grossly different morphologically from previously described species, was observed in 1 of 5 Scorpaenichthys marmoratus. The developmental cycle in the leech vector Malmiana sp. was described; the leech Trachelobdella sp. was also shown to be a potential vector. Leeches belonging to the following genera were collected during this study: Johanssonia, two species; Malmiana, three species; Trachelobdella, Oceanobdella, Orientobdella, and Ostreobdella. Of these, one species of Malmiana and one of Orientobdella were experimentally shown to be vectors of hemoflagellates. / Graduation date: 1975
25

Biology of the microsporidan parasite, Pleistophora sp., in three species of Crangonid sand shrimp

Breed, Gail Miner 16 September 1976 (has links)
The microsporidan Pleistophora sp. is a common parasite of Crangon franciscorum, C. nigricauda, and C. stylirostris in the vicinity of Yaquina Bay, Oregon. Characteristics of the parasite are described. Skeletal muscle was the only host tissue infected. The seasonal prevalence and intensity of the parasite in crangonids are described, based on examination of 1,556 C. franciscorum, 3,877 C. nigricauda, and 1,674 C. stylirostris collected at monthly intervals from June, 1975, through June, 1976. Prevalence in C. franciscorum and C. stylirostris increased through the fall and reached winter peaks of 30.3% and 41.0% respectively, then decreased in the spring. Prevalence in C. nigricauda remained below 8% through the year. Intensity increased with size of the shrimp in the three species. Infection experiments and field observations indicate that only very young shrimp are susceptible to infection during a relatively short period during the summer months. Following initial exposure, the infection spread within the host, indicating repeated schizogonic cycles. Parasitic castration was indicated by the absence of gravid infected female shrimp and was confirmed by histological examination. Ovaries of infected shrimp did not develop beyond a very early stage. A shift in sex ratio toward females in infected shrimp also indicates that the parasite may influence sex determination. Shrimp showed little cellular response to infection. Only rarely in heavily infected shrimp was encapsulation of the parasite cysts observed, and necrotic tissue was occasionally observed. Infected shrimp succumbed before uninfected shrimp under low oxygen stress. The collection of unusually large infected shrimp indicates that these shrimp either experienced accelerated growth or lived longer than uninfected shrimp. / Graduation date: 1977
26

Granulocyte éosinophile

Raffi, Hélène Bret-Bennis, Lydie January 2008 (has links) (PDF)
Reproduction de : Thèse d'exercice : Médecine vétérinaire : Toulouse 3 : 2008. / Titre provenant de l'écran titre. Bibliogr. p. 205-247.
27

Nematodes Parasitic in Suncus Murinus and Bandicota Nemorivaga from Formosa

Sapong, Debra January 1963 (has links)
The following work is based on the study of some nematodes collected in Formosa from two hosts , Suncua murinus and Bandicota nemorivaga . It deals with the taxonomy of the nematodes , with their hosts and with their geographical distribution range .
28

Pathogenicity of axenically cultivated Entamoeba histolytica in the hamster.

Ghadirian, Esfandiar. January 1978 (has links)
No description available.
29

A study of the epifauna on the leaves of Thalassia testudinum KÜnig in Barbados/

Hollingworth, Charles Edward January 1974 (has links)
No description available.
30

A molecular analysis of Leishmania chagasi and Leishmania infantum tropisms

Ponce, Maiza Campos January 2001 (has links)
No description available.

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