{HEAD ~ Microspherical sintered bodies} of hydroxyapatite thus obtained, which may be modified by {TAIL ~ an optical heat treatment} to adjust the surface area of the sintered body and growth of crystals therein, are useful in various fields of industry, for example, as a sorption agent in chromatographic separation 
{ HEAD ~ Microspherical sintered bodies } of hydroxyapatite thus obtained , which may be modified by { TAIL ~ an optical heat treatment } to adjust the surface area of the sintered body and growth of crystals therein , are useful in various fields of industry , for example , as a sorption agent in chromatographic separation
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