For Nb-PNCB:3 and Nb-PNCB:4, there was an increasing trend over time up to 72 h.
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Dual Structural Role of Niobium in Bioactive Borate Glasses Modulates Bioactivity, Cytocompatibility, and Hemostatic Potential.
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The sentences
On the other hand, phosphorus and niobium indicated distinct release profiles, with phosphorus demonstrating a decreasing trend after 6 h for PNCB and Nb-PNCB:1, and after 24 h for Nb-PNCB:2.