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Regular steps in bending cilia during the effective stroke.

S A Baba

    Nature
    |December 13, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Molluscan cilia exhibit a unique effective stroke with alternating rapid and slow phases. This suggests that the underlying microtubule sliding occurs in discrete, quantal steps, offering new insights into ciliary motion mechanics.

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    Area of Science:

    • Cell Biology
    • Biophysics
    • Biochemistry

    Background:

    • Ciliary and flagellar movement are crucial for locomotion and fluid transport.
    • The sliding microtubule model explains ciliary motion through relative microtubule displacement.
    • The effective stroke is a key component of the ciliary beat cycle.

    Purpose of the Study:

    • To investigate the detailed mechanics of the effective stroke in molluscan cilia.
    • To determine if microtubule sliding during the effective stroke is continuous or stepwise.
    • To provide evidence for or against quantal steps in microtubule sliding.

    Main Methods:

    • Analysis of ciliary beat cycles in molluscan cilia.
    • Measurement of angular velocity during the effective stroke.
    • Application of the sliding microtubule model to interpret ciliary motion.

    Main Results:

    • The effective stroke in molluscan cilia comprises regularly alternating rapid and slow phases of angular movement.
    • This observed pattern deviates from a uniformly continuous sliding model.
    • The findings support a model where microtubule sliding occurs in discrete steps.

    Conclusions:

    • The effective stroke of molluscan cilia is not a smooth, continuous process.
    • Microtubule sliding during ciliary motion appears to occur in quantal steps.
    • This quantal sliding mechanism may be a fundamental aspect of ciliary and flagellar mechanics.