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Studies on some digenetic trematodes from Ritner Creek, Polk County, Oregon

Creator:: Law, Daniel Tin-Hung
Abstract:: Seven species of fresh water fishes belonging to three different families and two species of snails from Ritner Creek, Polk County, Oregon were surveyed for adult and larval trematodes. A total of seven species of trematodes representing four families was recovered from the intestine of the fishes. Of these, at...
Resource Type:: Dissertation
Full Text:: RITNER CREEK, POLK COUNTY, OREGON Abstract approved: Redacted for privacy Stuart E. Knat4o Seven

Transmission of "Salmon Poisoning" disease to dogs by Nanophyetus salmincola eggs

Creator:: Nyberg, Peter Albert
Abstract:: The presence of the etiologic agent of "salmon poisoning" disease, Neorickettsia helminthoeca, was demonstrated in eggs of the trematode vector, Nanophyetus salmincola. Three dogs were given 100,000 and one dog 82,000 ground fluke eggs by intraperitoneal injection. The four animals developed "salmon poisoning" disease and died. One of these dogs...
Resource Type:: Dissertation
Full Text:: N (A:; \C)-r \S( 1 ACKNOWLEDGMENT Dr. Stuart E. Knapp has freely and enthusiastically given of

Histochemical study of some enzymes of the common liver fluke, Fasciola hepatica L.

Creator:: Panitz, Eric
Abstract:: Acid and alkaline phosphatase was localized histochemically in the intestinal epithelium and excretory duct respectively in fresh frozen sections of Fasciola hepatica. Polyphenol oxidase was localized in the vitellaria, vitelline ducts and egg-shells. The distribution and nature of esterases was examined histochemically. Acetyl-cholinesterase was observed in the tegument, neural ganglia,...
Resource Type:: Dissertation
Full Text:: Privacy Stuart E. Knapp I Acid and alkaline phosphatase was localized histochemically in the intestinal

Pathogenicity of experimentally induced concurrent infections of Fasciola hepatica and Haemonchus contortus in sheep

Creator:: Presidente, Paul J.
Abstract:: Twenty yearling sheep were allotted to four groups, each containing five sheep of approximately equal weight. On experimental days 0, 1, 2, 3, and 4, each sheep in each group was given the following inoculations by stomach tube: five sheep in group I (Fasciola hepatica-exposed controls) were given approximately 120...
Resource Type:: Dissertation
Full Text:: HEPATICA AND HAEMONCHUS CONTORTUS IN SHEEP Abstract approved: Redacted for privacy Stuart E. ,Knapp

Sphaeromyxa maiyai sp. n. (Protozoa:Myxosporidea) : a light microscopic and ultrastructural analysis employing the scanning and transmission electron microscopes

Creator:: Morrison, N. Donald
Abstract:: Sphaeromyxa maiyai sp. n. (Myxosporidea:Myxiidae) is described from the gall bladder of the Pacific tomcod, Microgadus proximus Girard, from Newport, Oregon. The plasmodial (=trophic, trophozoite) stage is discoid averaging between 1 and 2 cm. The spore averages 27.6 x 5. 6μm with pyriform polar capsules averaging 9. 3 x 3....
Resource Type:: Dissertation
Full Text:: MICROSCOPES Abstract approved: Redacted for Privacy Dr. Stuart E. Knapp[/ Dr. Ivan Pratt, deceased

The effects of various factors on the formation and fate of extranuclear chromatic bodies in Tetrahymena pyriformis

Creator:: Salamone, Michael
Abstract:: During karyokinesis in the ciliate, Tetrahymena pyriformis, strain GL-I, an extranuclear chromatin body (ECB) is frequently formed as an excluded mass between the two dividing daughter macronuclei. The formation and fate of ECB's were followed by means of Feu lgen, toluidine blue 0, and euchrysine staining and autoradiography (³H-thymidine). The...
Resource Type:: Dissertation
Full Text:: PYRIF9MIS Abstract approved: Redacted for Privacy Ernet T. DornfeldN Redacted for Privacy D. Stuart

Environmental influences on host-pathogen dynamics of the amphibian chytrid fungus

Creator:: Buck, Julia C.
Abstract:: The causes of the global biodiversity crisis are varied and complex. Anthropogenic threats may act in isolation, or interact additively or synergistically with each other or with natural stressors to affect sensitive taxa. The recent emergence of many infectious diseases in wildlife has brought attention to the role of disease...
Resource Type:: Dissertation
Full Text:: amphibian chytrid fungus AN ABSTRACT OF THE DISSERTATION OF Julia C. Buck for the degree of Doctor

Population genetics of ranid frogs : investigating effective population size and gene flow

Creator:: Phillipsen, Ivan C.
Abstract:: This dissertation focuses on the evolutionary forces of genetic drift and gene flow in frog populations. The balance of these two forces and the force of mutation largely determine the amount of neutral genetic variation within populations as well as the degree of genetic similarity among populations. The stochastic evolutionary...
Resource Type:: Dissertation
Full Text:: DISSERTATION OF Ivan C. Phillipsen for the degree of Doctor of Philosophy in Zoology presented on June 2

Multiple stressors and amphibian population declines

Creator:: Hatch, Audrey C.
Abstract:: In the past decade, declines in amphibian populations have captured scientific and popular interest. The causes of the declines are likely to be complex and involve interactions between several environmental stressors. Using multifactorial experiments, I investigated the combined effects of several anthropogenic stressors on developing amphibians in Oregon, USA. In...
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE DISSERTATION OF Audrey C. Hatch for the

An analysis of a population of snowshoe hares, Lepus americanus washingtonii Baird, in western Oregon

Creator:: Black, Hugh C., 1941-
Abstract:: The ecology of a population of snowshoe hares, Lepus americanus washingtonii, was studied in western Oregon from 1960 to 1962. Objectives were to obtain information to control hares, which frequently cause damage to coniferous reproduction in the region, and to compare the life history of this little-studied subspecies with others....
Resource Type:: Dissertation
Full Text:: pathological examination of snowshoe hares and for the use of laboratory facilities. Dr. Stuart E. Knapp

ScholarsArchive@OSU

Studies on some digenetic trematodes from Ritner Creek, Polk County, Oregon

Transmission of "Salmon Poisoning" disease to dogs by Nanophyetus salmincola eggs

Histochemical study of some enzymes of the common liver fluke, Fasciola hepatica L.

Pathogenicity of experimentally induced concurrent infections of Fasciola hepatica and Haemonchus contortus in sheep

Sphaeromyxa maiyai sp. n. (Protozoa:Myxosporidea) : a light microscopic and ultrastructural analysis employing the scanning and transmission electron microscopes

The effects of various factors on the formation and fate of extranuclear chromatic bodies in Tetrahymena pyriformis

Environmental influences on host-pathogen dynamics of the amphibian chytrid fungus

Population genetics of ranid frogs : investigating effective population size and gene flow

Multiple stressors and amphibian population declines

An analysis of a population of snowshoe hares, Lepus americanus washingtonii Baird, in western Oregon

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