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