Polysaccharides and related glycopolymers offer a unique challenge to analytical ultracentrifugafion for two clear reasons. Firstly, there is a growing demand for basic solution biophysical information on these substances: molecular weights, molecular weight distributions, conformation, conformation distributions; information which analytical ultracentrifuge can, in principle, supply. This info...

It is generally believed that the erythrocyte sedimentation (E.S.R.) is retarded and tends to fall to normal when decompensation occurs in rheumatic fever and other heart diseases known to be associated with elevated values.2' 4, 5, 7. 9 Observations by McGinnis and co-workers,6 who excluded patients who presented evidence of other conditions known to lead to elevation of the E.S.R., however, d...

The sedimentation velocity profiles of the entities in mouse bone marrow responsible for erythropoietic burst formation (BFU-E) and for erythrocytic colony formation (CFU-E) have been studied under conditions designed to determine whether the values observed are real or result from cell interactions occurring during culture of the fractions. Bone marrow cells of adult C3Hf/Bi mice were subjecte...

We consider the sedimentation of high aspect ratio fibers in a Newtonian fluid under Stokes’ flow conditions. Measurements of the mean sedimentation velocity, variance of the sedimentation velocity, and the orientation distribution are presented using a modification of the novel experimental technique described by Nicolai et al. [Phys. Fluids 7, 12 (1995)]. We find a steady state where the fibe...