| photobleach | To lose colour or make white by the action of light; e.g., the use of a laser to bleach a fluorescent dye covalently linked to a macromolecule. (05 Mar 2000) |
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| photobleaching | <biochemistry> Light induced change in a chromophore, resulting in the loss of its absorption of light of a particular wavelength. A problem in fluorescence microscopy where prolonged illumination leads to progressive fading of the emitted light because less of the exciting wavelength is being absorbed. (18 Nov 1997) |