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Optimizing factors for biosynthesized Hem-NPs using A. niger AH1: (A) the effect of the contact time between the biomass filtrate and 1.0 mM of FeSO4·7H2O concentration, (B) the effect of different pH values, and (C) the effect of different FeSO4·7H2O concentrations. Small letters a, b, c, d, ab, bc, cd show the power of significance.
