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Updated: Jul 5, 2026

Spot Variation Fluorescence Correlation Spectroscopy for Analysis of Molecular Diffusion at the Plasma Membrane of Living Cells
Published on: November 12, 2020
Systematic evaluation of FRAP experiments performed in a confocal laser scanning microscope--part II: Multiple
G I Hauser1, S Seiffert, W Oppermann
1Institute of Physical Chemistry, Clausthal University of Technology, Arnold-Sommerfeld-Strasse 4, D-38678 Clausthal-Zellerfeld, Germany.
Abstract:
A procedure for a systematic evaluation of fluorescence recovery after photo-bleaching (FRAP) data is presented that allows one to determine distributions of diffusion coefficients. The method provides a straightforward and calibration-free way to quantify multiple diffusion processes when FRAP is measured as a function of time and space by means of confocal laser scanning microscopy. It is verified utilizing FRAP experiments on mixtures of differently sized fluorescent micro-spheres as realizations of discrete D distributions.
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