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Quasielastic light-scattering measurements were made on isolated, osmotically swollen, bovine rod outer segment (ROS) disk membranes in aqueous Ficoll. The translational diffusion coefficients determined were (1.66 +/- 0.21) X 10(-9) and (2.31 +/- 0.14) X 10(-9) cm2/s at 25 degrees C for the unbleached and bleached membranes in 5% Ficoll, respectively, yielding the Stokes radii of 0.53 +/- 0.07 micronm for the former and 0.38 +/- 0.02 micronm for the latter. This photoinduced size decrease, which corresponds to a 60% decrease in the intravesicular volume, is far more pronounced than thos reported by others for ROS fragments.
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Hoffman et al. (1977) studied this question.
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