Physics – Optics
Scientific paper
2008-02-26
J. Biophotonics (2008) 1-12
Physics
Optics
12 pages, 6 figures, 1 tableau
Scientific paper
10.1002/jbio.200810506
Spatial Fluorescence Cross Correlation Spectroscopy is a rarely investigated version of Fluorescence Correlation Spectroscopy, in which the fluorescence signals from different observation volumes are cross-correlated. In the reported experiments, two observation volumes, typically shifted by a few $\mu$m, are produced, with a Spatial Light Modulator and two adjustable pinholes. We illustrated the feasibility and potentiality of this technique by: i) measuring molecular flows, in the range 0.2 - 1.5 $\mu$m/ms, of so-lutions seeded with fluorescent nanobeads or rhodamine molecules (simulating active transport phenomenons); ii) investigating the permeability of the phospholipidic membrane of Giant Unilamellar Vesicles versus hydrophilic or hydrophobic molecules (in that case the laser spots were set on both sides of the membrane). Theoretical descriptions are proposed together with a discus-sion about Fluorescence Correlation Spectroscopy based, alternative methods.
Blancquaert Yoann
Delon Antoine
Derouard Jacques
Gao Jie
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