Polar capsule
In today's world, Polar capsule is a topic that has captured the attention of people of all ages and cultures. Its relevance has been reflected in the extensive media coverage it has received, as well as in the growing interest it has aroused in different sectors of society. Experts and hobbyists alike have found reasons to dedicate time and resources to exploring this topic and its implications. In this article, we will examine Polar capsule from different angles, analyzing its impact in various areas and offering perspectives to better understand its importance in the current context.
Polar capsules are structures found in the valves of myxosporean parasites, which contain the polar filament. The polar capsule is constructed of a proteinaceous and a polysaccharide layer, both layers of which continue into the polar filament.
The mouth of the capsule is covered with a cap-like structure. This structure may function as a stopper, its digestion in the alimentary tract possibly triggering the discharge of the polar filaments.
Two ideas have been proposed to explain the eversion of the polar filaments. Firstly, that the hydrostatic pressure in the polar capsule pushes the filament out, rather like the cnidocyst of jellyfish. The second is that extrusion is an active process involving contractile proteins and is calcium-dependent (Uspenskaya, 1982).
References
- Uspenskaya, A.V. (1984). Cytology of myxosporidia. Nauka, Leningrad. 122pp.
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