text: In chemistry,<unk>  assays the rotational diffusion of a molecule from the decorrelation of polarization in<unk> , i.e., between the exciting and emitted (fluorescent) photons.  This decorrelation can measure the "tumbling time" of the molecule as a whole, or of a part of the molecule relative to the whole.  From the rotational diffusion constants, one can estimate the rough shape of a macromolecule.
option_0: Fluorescence anisotropy
option_1: Anion gap
option_2: Extraction ratio
option_3: Molecular mass
option_4: Electrochemical gradient
option_5: Spin quantum number
option_6: Chemical polarity
option_7: Isoelectric point