AbstractTo determine the concentration of calcium hydroxyapatite occluded in polystyrene beads, styrene was polymerized in aqueous dispersion in the presence of calcium hydroxyapatite labeled with P32. It was found that the large beads contain a larger concentration of occluded apatite than the smaller ones. The results suggest that larger beads are formed during the “sticky stage” by coalescence of smaller ones carrying apatite imbedded in their surf
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