Gediminas Valkiunas's Avian Malarial Parasites and Other Haemosporidia PDF

By Gediminas Valkiunas

ISBN-10: 0415300975

ISBN-13: 9780415300971

ISBN-10: 2004050268

ISBN-13: 9782004050267

Whilst learning the consequences of parasites on usual populations, the avian haematozoa fulfills the various requisites of an amazing version. that includes a mess of tables and illustrations, Avian Malaria Parasites and different Haemosporidia summarizes greater than a century of study on poultry haemosporidians. for a very long time, fowl blood parasites served as vital types in learning human ailments. even supposing now principally changed, the wealth of knowledge and examine stay. With chapters addressing lifestyles cycles and morphology, pathogenicity, ultrastructure, geographical distribution, and illustrated keys to all recognized species of the parasites, this ebook is a masterful evaluation of the biology of poultry haemosporidian parasites.

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Sample text

13, 1–2; Pl. I, 2). Phanerozoites developing in the endothelial cells of brain usually have an elongated form (Fig. 14; Pl. I, 3). The number of merozoites formed in the exoerythrocytic meronts is a character used for the identification of certain species. Less than 1000 merozoites usually develop in the exoerythrocytic meronts of malaria parasites, but sometimes there are many fewer. Erythrocytic meronts and gametocytes of different species are variously shaped and characterized by distinct differences according to their influence on host cells, which is widely used in the systematics.

Erythrocytic meronts of malaria parasites contain pigment granules of golden, brown, or black color (Fig. 12, 3–9), which frequently group together in mature meronts. The pigment is insoluble residuum formed in the process of hemoglobin digestion (Yamada and Sherman, 1979). The pigment granules are easily distinguished under the light microscope due to their property of strong light refraction. The duration of the erythrocytic merogony and the degree of its synchronization differ for various species.

Dust-like azurophilic inclusions are found in the gametocytes of many species. They are usually called valutin or ‘pseudopigment’. The nature of valutin has not been studied yet in detail. Valutin weakly refracts light, unlike malarial pigment (hemozoin) which is not present in leucocytozoids because the parasites digest hemoglobin completely when they develop in red blood cells. The ratio of the macro- and microgametocytes in the same individual birds significantly differs in the course of parasitemia.

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Avian Malarial Parasites and Other Haemosporidia by Gediminas Valkiunas

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