Abstract
The principle of fluorescence correlation spectroscopy is outlined. The technique has been applied to a mutant of the well-known green fluorescent protein. A comparative study has been made with time-resolved fluorescence anisotropy. The latter experiment shows that the fluorophore is rigidly bound inside the protein matrix follows the rotation of the whole protein and does not show any fast restricted motion. It is evident from fluorescence correlation spectroscopy that some excited-state reaction plays a role, since the autocorrelation traces show a significant effect on the incident laser power. Other potential applications of fluorescence correlation spectroscopy are presented as taken from very recent publications.
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