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Aktivierung und Inaktivierung der Miracidien vonSchistosoma mansoni innerhalb der Eischale

Activation and inactivation of the miracidia ofSchistosoma mansoni within the egg-shell

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Summary

The activation ofSchistosoma mansoni takes place in five steps which can be recognized under the microscope.

  1. 1.

    Flame beat in the protonephridia.

  2. 2.

    Contractions of the whole animal.

  3. 3.

    Movement of the cilia at the front part of the miracidium.

  4. 4.

    Movement of the cilia on the whole surface.

  5. 5.

    Opening of the egg capsule and emerging of the miracidium.

Until the immediate start of the emerging process the inactivation can be brought about by putting the activated miracidium in a sodium chloride solution, which can have a concentration from 0,9% to 2,5%.

Mannitole solutions, which concerning their osmotic value equal the above mentioned sodium chloride solutions, show the same effect on the animal.

The same animal was activated up to three times and inactivated two times.

Activation and inactivation of the miracidium are experimentally caused by uptake and loss of water. Possible mechanisms of inactivation are discussed.

Zusammenfassung

Die Aktivierung der Miracidien vonSchistosoma mansoni wird in 5 beobachteten Teilschritten beschrieben. Bis unmittelbar vor Ablauf des Schlüpfmechanismus ist durch Überführung der aktivierten Miracidien in Natriumchloridlösungen zwischen 0,9 und 2,5% Inaktivierung möglich. Mannitlösungen, die in ihrem osmotischen Wert mit verwendeten Natriumchloridlösungen übereinstimmen, zeigen den entsprechenden Effekt. Das gleiche Individuum wurde bis zu dreimal aktiviert und zweimal inaktiviert.

Aktivierung und Inaktivierung beruhen auf Wasseraufnahme bzw. Wasserentzug. Mögliche Inaktivierungsmechanismen werden diskutiert.

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Authors and Affiliations

  1. Abteilung Tierphysiologie, Zoologisches Institut und Zoologisches Museum der Universität Hamburg, Papendamm 3, D-2000, Hamburg 13, Bundesrepublik Deutschland

    W. Becker

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  1. W. Becker
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Additional information

Diese Arbeit wurde durch die Deutsche Forschungsgemeinschaft unterstützt.

Frau Irma Platow danke ich sehr für ihre technische Hilfe.

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Becker, W. Aktivierung und Inaktivierung der Miracidien vonSchistosoma mansoni innerhalb der Eischale. Z. F. Parasitenkunde 42, 235–242 (1973). https://doi.org/10.1007/BF02482638

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  • DOI: https://doi.org/10.1007/BF02482638

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