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Bromegrass mosaic virus undergoes a reversible decrease in its sedimentation coefficient when the pH is raised above pH 6.7. At pH 6 the sedimentation coefficient is 87 S, at pH 7 it is 79 S. Intrinsic viscosities determined at pH 6 and 7 are 3.64 and 5.5×10 -2 dl/gm. Diffusion coefficients are 1.56×10 -7 cm 2 /sec. and 1.44×10 -7 cm 2 /sec., respectively. Radii...