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