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Ultrastructure of oncospheral envelopes at the final stage of infective - egg formation in some species of Cyclophyllidea

100%
Chomicz L., Walski M.
Wiadomości Parazytologiczne
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1998
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tom 44
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nr 3
2

Transmission of horseradish peroxidase across the tegument of some hymenolepidid species [Cyclophyllidea]

84%
Walski M., Cielecka D., Chomicz L., Grytner-Ziecina B.
Acta Parasitologica
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1995
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tom 40
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nr 4
Strobilae of three hymenolepidid tapeworm species: Diorchis elisae, Fimbriaria fasciolaris and Sobolevicanthus gracilis, obtained from experimentally infected domestic ducks, were incubated for 5,10 and 15 min at a temperature of 38°C, with horseradish peroxidase applied as a tracer by which to research macromolecular transport across the tegument. Through the use of an electron microscope, it was indicated that the marked protein was bound at the surface of the microtriches with the co-participation of glycoproteins of the plasma membrane. It was also shown that the protein molecules gathered at the base of the microtriches were transported in vesicular form inside the syncytial layer and perikaryon part of the tegumental cytoplasm. Molecules of horseradish peroxidase liberated from the vesicles were observed in the excretory system of the tapeworms. In spite of interspecific differences in the structure of the tegument, the tracer protein transmission observed in this research was found to proceed in a similar manner in all the hymenolepidids studied.
3

Functional ultrastructure of the oncospheral envelopes of twelve hymenolepidid species with aquatic life cycle s

84%
Chomicz L., Swiderski Z.
Acta Parasitologica
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2004
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tom 49
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nr 3
Most of the previous studies on the functional ultrastructure of oncospheral envelopes in cestodes are restricted to hymenolepidids with terrestrial life cycles, mainly parasites of mammals. The purpose of the present study is to describe and compare origin, differentiation and functional ultrastructure of oncospheral envelopes of 12 cestode species with aquatic life cycles examined by means of transmission (TEM) and scanning electron microscopy (SEM) techniques. Results of our comparative electron microscopical studies revealed that despite the general similarities in the ultrastructure of the primary envelopes surrounding developing embryos, there exist important differences both in the type of morphogenesis and in the final form and arrangement of the secondary envelopes between the 12 examined hymenolepidids. In all examined species, the embryophore develops within the syncytial layer of the primary inner envelope and is transformed into a heterogeneous structure in the final phase of infective egg formation. Some ultrastructural features of oncospheral envelopes are very characteristic for the cestode species examined, and may indeed represent a new useful criterion for differential diagnosis. Our data on ultramorphology of the envelopes and their connections with the uterine wall may also be useful for better understanding of the developmental physiology and biology of the oncospheral stage of hymenolepidids with aquatic life cycles. The comparative analysis allows determination of some ultrastructural features that adapt oncospheres to the behavior and habitat of their intermediate hosts. Interrelations among the ultrastructure of the oncospheral envelopes, habitat of crustacean intermediate hosts, and cestode life cycles are drawn and discussed.
4

Two new hymenolepidid species [Cestoda, Hymenolepididae] from water shrews Neomys fodiens Pennant [Insectivora, Soricidae] in Bulgaria

67%
Vasileva G. P., Tkach V. V., Genov T.
Acta Parasitologica
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2005
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tom 50
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nr 1
Two new hymenolepidid species, Coronacanthus magnihamatus sp. nov. and Triodontolepis boyanensis sp. nov. are described from the European water shrew, Neomys fodiens, in Bulgaria. The most important differentiating features of C. magnihamatus are the length of the rostellar hooks (26-28 um, mean 27 µm) and the thick-walled uterus, which does not form capsules in gravid proglottids. T. boyanensis is distinguished from other members in the genus by the number (16) and size (47-48 µm, mean 48 µm) of the rostellar hooks, the non-capsulate gravid uterus, containing relatively large number of eggs (35-70, mean 49) and the embryophore, possessing polar filaments. The types of uterine development in hymenolepidids of Neomys spp. are discussed.
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