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We show that by using a simple optical method, thermodiffusion processes can be exploited for an accurate, reasonably fast determination of the diffusion coefficient D for various macromolecules in solution. As a byproduct, reliable values for the thermal-diffusion ratio kT are also derived. Furthermore, we report experimental evidence of a new type of convective instability generated in a dilute solution of macromolecules heated from above.
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Giglio et al. (1977) studied this question.
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