Electron Microscopy of Human Plasma Lipoprotein Separated by Ultracentrifugation

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Abstract
The particle size distribution of the Sf 30 "class" of serum lipoprotein was determined by the electron microscope. Most of the lipoprotein molecules are not spherical but have the shape of ellipsoids of rotation with an axis ratio of 1.5. The molecules of a homogeneous flotation "class" show differences in the reactivity of their lipid moiety demonstrated by their staining properties with osmium tetroxide.