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a SEM micrograph of particulate nano-HA synthesized by the wet chemistry method. (b,e) SEM micrographs of nano-HA/PLGA composites: (b,c) PHAa (the agglomerated nano-HA in PLGA composites); (d,e) PHAd (the well-dispersed nano-HA in PLGA composites). (b,d) the top surface, (c,e) the bottom surface. Original magnification: 100 kX. Magnification bars: 200 nm.
