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SynopsisThe molecular weights and radii of gyration of Streptococcus salivarius levan fractions were obtained from light-scattering measurements iii water. Sedimentation coefficients and partial specific volumes of the fractions were also obtained. Double logarithmic plots of [q] versus and SO versus li?, yielded slopes having values of 0.17 and 0.62, respectively. The data and various calculated parameters show that levan from Streptococcus salivarius is highly branched and behaves hydrodynamically as a compact particle of spherical symmetry.