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A possible two-photon effect in vitro using a focused laser beam

M W Berns

    Biophysical Journal
    |August 1, 1976
    PubMed
    Summary
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    Researchers observed a likely two-photon effect in living cell chromosomes using intense pulsed lasers. This was supported by a derived two-photon action spectrum and a lack of reciprocity, indicating a novel biological interaction.

    Area of Science:

    • Cell biology
    • Biophysics
    • Laser physics

    Background:

    • Intense pulsed laser beams can interact with biological materials.
    • Chromosomes are critical cellular structures for genetic information.
    • Non-linear optical effects in biological systems are of growing interest.

    Purpose of the Study:

    • To investigate the potential for two-photon excitation in living cell chromosomes.
    • To characterize the spectral properties of this observed phenomenon.
    • To determine if the effect exhibits reciprocity.

    Main Methods:

    • Focusing an intense pulsed laser beam onto chromosomes within living cells.
    • Deriving a two-photon action spectrum for the observed effect.
    • Assessing the reciprocity of the laser-induced effect.

    Related Experiment Videos

    Main Results:

    • A probable two-photon effect was observed when intense pulsed laser light was focused on chromosomes.
    • The derived two-photon action spectrum provided evidence supporting this non-linear optical phenomenon.
    • A lack of reciprocity was demonstrated, further suggesting a two-photon mechanism.

    Conclusions:

    • The study provides evidence for a two-photon effect occurring in living cell chromosomes.
    • The findings suggest that non-linear optical interactions can occur within cellular structures.
    • This research opens avenues for advanced cell imaging and manipulation techniques.