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Related Experiment Videos

Permeability changes in the egg-shell of hookworms during development and eclosion.

B E Mathews

    Parasitology
    |December 1, 1986
    PubMed
    Summary

    Hookworm eggs (Ancylostoma) develop normally in various solutions, but hatching is inhibited by certain anthelmintics. The eggshell likely protects larvae by selectively allowing oxygen entry while blocking larger molecules.

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    Area of Science:

    • Parasitology
    • Molecular Biology
    • Veterinary Medicine

    Background:

    • Ancylostoma ceylanicum and Ancylostoma tubaeforme are hookworm species.
    • Understanding egg development and hatching is crucial for parasite control.

    Purpose of the Study:

    • To investigate the effects of various solutions on hookworm egg development and hatching.
    • To determine the role of molecular weight and chemical properties on larval survival.

    Main Methods:

    • Time-lapse video micro-recording was used to observe egg development.
    • Eggs were exposed to a range of inimical solutions, including anthelmintics and lanthanum chloride.

    Main Results:

    • Larvae developed to the pretzel stage in all tested compounds, increasing shell permeability.
    • Anthelmintics (Mr 400) inhibited eclosion, an effect potentiated by surface-active agents.
    • Lanthanum chloride affected larval development, not eclosion.
    • Large molecular weight compounds did not impact development or hatching.

    Conclusions:

    • The hookworm eggshell acts as a selective sieve, regulating molecule passage.
    • Anthelmintic efficacy is influenced by molecular weight and interaction with other agents.
    • No significant differences were observed between Ancylostoma ceylanicum and Ancylostoma tubaeforme egg responses.

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