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Related Experiment Videos

A method for establishing stable concentration gradients in agar suitable for studying chemotaxis on a solid surface.

L J Shimkets, M Dworkin, K H Keller

    Canadian Journal of Microbiology
    |December 1, 1979
    PubMed
    Summary

    Researchers developed a simple method for creating stable substance gradients in agar, varying inversely with distance. These stable gradients, crucial for applications like chemotaxis studies, can last over 1000 hours.

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    Area of Science:

    • Biochemistry
    • Physical Chemistry
    • Cell Biology

    Background:

    • Establishing stable chemical gradients is essential for studying biological processes like chemotaxis.
    • Previous methods often result in unstable or time-variant gradients, limiting their utility.
    • Agar diffusion systems are commonly used but require careful design for gradient stability.

    Purpose of the Study:

    • To develop a simple and reliable technique for creating stable, spherically symmetric substance gradients in agar.
    • To characterize the stability and duration of these gradients.
    • To explore potential applications and further developments of the technique.

    Main Methods:

    • A novel method for creating spherically symmetric concentration profiles where concentration is inversely proportional to the distance from the source.

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  • Utilizing the diffusion equation in a spherically symmetric system to model and predict concentration profiles.
  • Controlling the source and agar sink to establish either stable or time-variant gradients.

    • Main Results:

    • The developed technique successfully establishes stable gradients in agar for at least 190 hours, with theoretical potential for over 1000 hours.
    • Gradient stability is independent of the substance's diffusion coefficient.
    • Time-variant gradients can be generated by manipulating source or sink conditions, but shallow agar layers (e.g., petri dishes) inherently produce time-variant gradients.

    Conclusions:

    • A robust and simple method for generating stable, long-lasting substance gradients in agar has been demonstrated.
    • This technique offers significant advantages for studying chemotaxis and other diffusion-dependent biological phenomena.
    • The system's parameters allow for precise control over gradient profiles, enabling diverse experimental designs.