Dipalmitoyl lecithin and dipalmitoyl lecithin-cholesterol bilayers are capable of binding about the same number of uranyl ions as lecithin molecules. Dispersions of the uranyl-decorated bilayers give very distinct continuous X-ray diffraction peaks up to the seventh order. Electron density projection onto the normal to the membrane is obtained with a resolution of about 6.5 ~. It gives two high peaks separated by 48/~, indicating that uranyl ions are bound at the surfaces of membranes in both lecithin and lecithin--cholesterol bilayers.
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