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The ultrastructure and histochemistry of the cyst wall of Bucephalus haimeanus (Lacaze-Duthiers, 1854)

Published online by Cambridge University Press:  06 April 2009

Jacqueline C. Higgins ,
D. E. Wright  and
R. A. Matthews
Jacqueline C. Higgins
Affiliation:
School of Environmental Sciences, Plymouth Polytechnic, Drake Circus, Plymouth PL4 8AA, Devon
D. E. Wright
Affiliation:
School of Environmental Sciences, Plymouth Polytechnic, Drake Circus, Plymouth PL4 8AA, Devon
R. A. Matthews
Affiliation:
School of Environmental Sciences, Plymouth Polytechnic, Drake Circus, Plymouth PL4 8AA, Devon
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Extract

Metacercarial cysts of Bucephalus haimeanus occur throughout the liver of Pomatoschistus microps, greater concentrations being found around the gall bladder, blood vessels and periphery of the liver. The cyst wall is composed of three layers, an inner granular, middle vacuolated and outer nucleated layer. The inner layer consists of three zones, an inner zone of irregularly compacted, granular material; a middle densely compacted zone and an outer moderately compacted zone. Vacuoles of the middle layer vary in appearance and appear to be discharging their contents into the cyst cavity. The cells of the outer layer are flattened and elongated with elongate nuclei but no other distinct organelles. Occasionally at the outer edge of the cyst are electron-dense cells which are in the process of degeneration. Only small amounts of collagen and very few leucocytes are associated with the cysts.

The cyst wall is carbohydrate in nature containing some free aldehyde groups, galactogen and neutral mucosubstances. The inner layer appears to consist of mainly acidic mucopolysubstances and weakly acidic sulphomucins. Large amounts of protein, carbohydrate-protein complexes and DNA are also present within the cyst wall. Alkaline and acid phosphatases, ATPase, β-glucuronidase and N-acetyl-β-glucosaminidase were detected. The origin and function of the cyst wall is discussed.

Type
Research Article
Information
Parasitology , Volume 75 , Issue 2 , October 1977 , pp. 207 - 214
Copyright
Copyright © Cambridge University Press 1977

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