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The scanning electron photomicrographs of materials. (a), Lactose (the raw material) (5000 X); (b), Lactose-0 (processed without PVP K30) (5000 X); (c), Lactose-P1 (processed with 1% PVP K30) (5000 X); (d), Lactose-P2 (processed with 2% PVP K30) (5000 X); (e), Lactose-P3 (processed with 3% PVP K30) (6000 X).
