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 {TAIL ~ growth} of crystals therein, are useful in various fields of industry, for example, as {HEAD ~ 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 { TAIL ~ growth } of crystals therein , are useful in various fields of industry , for example , as { HEAD ~ a sorption agent } in chromatographic separation
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