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Related Concept Videos

Channel Rhodopsins01:11

Channel Rhodopsins

Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...

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Single Molecule Fluorescence Microscopy on Planar Supported Bilayers
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Bacteriorhodopsin films as spatial light modulators for nonlinear-optical filtering.

R Thoma, N Hampp, C Bräuchle

    Optics Letters
    |September 24, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Dry purple membrane films containing bacteriorhodopsin (BR) function as nonlinear-optical filters. These biological films control light transmission, enabling applications in spatial filtering like edge enhancement.

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    Area of Science:

    • Biophysics
    • Optical Engineering
    • Materials Science

    Background:

    • Bacteriorhodopsin (BR) is a biological photochrome found in purple membranes (PM).
    • BR exists in two primary photoactive states, B and M, with distinct absorption maxima at 570 nm and 412 nm, respectively.
    • The light-induced transitions between B and M states enable light-controlled modulation of PM film transmission.

    Purpose of the Study:

    • To describe the application of dry purple membrane films for nonlinear-optical filtering.
    • To present a model for the nonlinear transmission properties of PM films.
    • To demonstrate the use of these films in spatial filtering applications.

    Main Methods:

    • Utilizing dry purple membrane (PM) films containing bacteriorhodopsin (BR).
    • Investigating the photoactive states (B and M) and their absorption characteristics.
    • Developing a model to describe the nonlinear transmission based on photoreaction kinetics.
    • Testing PM films in spatial filtering tasks, such as edge enhancement.

    Main Results:

    • PM films exhibit light-controlled absorptive spatial light modulation.
    • The nonlinear transmission is dependent on the ratio of forward (B to M) and backward (M to B) photoreactions.
    • A model accurately describes the nonlinear transmission of wild-type and mutated BR variants (e.g., BR(D96N)).
    • Successful demonstration of spatial filtering, including edge enhancement, using PM films.

    Conclusions:

    • Dry purple membrane films are effective nonlinear-optical filters.
    • BR-based PM films offer a biological solution for light-controlled spatial light modulation.
    • These materials show promise for advanced optical processing and filtering applications.