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We have developed a wide-field time-resolved imaging system to image quantitatively both the fluorescence lifetime and the rotational correlation time of a fluorophore. Using a polarization-resolved imager, we simultaneously image orthogonal polarization components of the fluorescence emission onto a time-gated intensified CCD. We demonstrate imaging of solvent viscosity variations through the rotational correlation time of fluorescein in a multiwell plate and apply this technique to probe the microviscosity in live cells.
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Suhling et al. (2004) studied this question.
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