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This work presents the results of investigation of cardiac muscle in 137 bisons shot in the Białowieża Forest during breeding selection in the years 1990-1995. The investigation focused upon the occurrence of protozoan Sarcocystis sp. and the lesions caused by it. Macroscopic inspection did not show any lesions characteristic of Sarcocystis sp. Histopathological examination was carried out of sections of the left heart ventricle, the right heart ventricle and interventricular septum. For 137 bisons examined in 117 animals the presence of Sarcocystis sp. in the heart muscle was confirmed, which means 85,4%. Moreover, the cardiac muscle showed inflammatory cell infiltration, hyperemia, degeneration and less frequently necrosis. The animals in which the presence of Sarcocystis was not confirmed belonged to the age group under 1 year. Differences in structure of cysts walls indicate the occurrence of various species of Sarcocystis in bisons.
Medycyna Weterynaryjna
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2010
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tom 66
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nr 07
s.489-494,fot.,tab.,bibliogr.
The aim of this work was to evaluate the histopathological changes in dog adrenals with a special attention to cortical-cell lipidosis. The routine histopathological examinations were performed in adrenals, which were obtained post mortem from 50 dogs of both sexes, 1-22 years old. The research revealed the presence of lipidosis in the cells of zona reticulosa, and/or proliferation of cortical cells. The type of proliferation was variable, from simple hyperplasia related to hyperstimulation of the secretion of cortical cells up to benign or malignant neoplasms. A special attention was paid to the lipidosis of cortex cells. This type of degenerative changes results from disturbances in the cell lipid metabolism. The affected cells were observed in dogs older than 1 year, and their number increased with the animal’s age. Lipidosis alone was found in 8% cases, in 16% cases it was combined with hyperplasia of cortex cells, and in 30% cases it was accompanied by a neoplastic growth. Pathological accumulation of cytoplasmic lipids may result from metabolic disturbances due to the exposure to various toxic substances. The pathologic process may lead to the necrobiosis of cell nuclei. In the adrenals examined, lipidosis affected the cells in zona reticularis. Lipidosis did not appear to be related to the sex of the dogs, but the degeneration tended to increase in older dogs. It must be stressed, however, that in about half the cases examined (36%) lipidosis was not observed in adrenals with hyperplastic or neoplastic changes.
To examine the susceptibility of pigs for elaphostrongylosis, six 3.5-month-old Vietnam pigs were infected with doses of from 500 to 10000 invasive larvae of E. cervi. In all infected pigs any clinical symptoms of infection were observed. After one month post infection a necropsy of the pig infected with 5000 larvae was conducted. On the surface of the liver itself were found 6 white nodules from 2 to 6 mm in diameter. Third stage larvae of E. cervi were found in enlarged mesenteric lymph nodes. Most of them were dead, but after isolation some were still alive. The rest of the pigs infected with doses of 3000, 2000, 1000, 500 and 10000 larvae, were necropsied successively after 2, 3, 4, 5 and 6 months post infection. Any pathological changes were observed in their organs. In the pig necropsied 2 months post infection, dead E. cervi larvae or their fragments were found in mesenteric lymph nodes, and in the rest of the pigs, in this same localization, only fragments of dead larvae or detritus after their resorption were found. Histopathological examinations confirmed the presence of parasitic nodules in lymph nodes and in livers in which cross-sections of larvae of this parasite have been seen. Results of the presented investigations indicate that pigs are not susceptible to infection of E. cervi larvae. One can suppose that a similar low susceptibility to the discussed parasitosis occur in other omnivorous animals and also in men.
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