Journal
BIOPHYSICAL JOURNAL
Volume 91, Issue 5, Pages 1915-1924Publisher
BIOPHYSICAL SOCIETY
DOI: 10.1529/biophysj.106.082297
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Here we discuss the application of scanning. uorescence correlation spectroscopy ( SFCS) using continuous wave excitation to analyze membrane dynamics. The high count rate per molecule enables the study of very slow diffusion in model and cell membranes, as well as the application of two-foci. uorescence cross-correlation spectroscopy for parameterfree determination of diffusion constants. The combination with dual-color fluorescence cross-correlation spectroscopy with continuous or pulsed interleaved excitation allows binding studies on membranes. Reduction of photobleaching, higher reproducibility, and stability compared to traditional FCS on membranes, and the simple implementation in a commercial microscopy setup make SFCS a valuable addition to the pool of fluorescence fluctuation techniques.
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