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Analysis of the bacterial cell viability on the cross-linked nanohydroxyapatite-reinforced alginate–gelatin hydrogel surface (3A5G0.25H, 3A5G0.5H, and 3A5G0.75H) through the staining of live bacteria by confocal microscopy. (a, b) Qualitative and quantitative evaluation with respect to live E. coli bacteria on the cross-linked hydrogel surface. (c, d) Qualitative and quantitative evaluation with respect to live S. aureus bacteria on the cross-linked hydrogel surface.
