We show that the experimental results on the concentration fluctuations in aqueous solutions of bovine eye lens protein ${\gamma }_{11}$-crystallin along the critical isochore, obtained by Fine et al. [Phys. Rev. Lett. 74, 198 (1994)] using quasielastic light scattering, can be explained using our recently proposed theory on the dynamics of polymer solutions with spatiotemporal correlated noise. This theory is characterized by two parameters λ and τ, which are the correlation length and correlation time, respectively, of the colored noise. Our theory gives the nonexponential decay in the time autocorrelation function observed in experiment. Fitting the averaged experimental decay rate of Fine to our theory, we predict the solution viscosity and τ to be about 0.05N s/${\mathrm{m}}^2$ and 0.02–0.05 s, respectively, and it is independent of the correlation length parameter λ. © 1996 The American Physical Society.

• Received 20 June 1995

DOI:https://doi.org/10.1103/PhysRevE.53.1280