Fig. 1From: Gold nanoparticles exhibit anti-osteoarthritic effects via modulating interaction of the “microbiota-gut-joint” axisThe characterization and main experimental design of GNPs. (A) The detailed experimental design and analytical approach of the study. (B) The general characterization of GNPs under scanning electron microscope. (C) Size distribution of GNPs. (D) Zeta potential distribution of GNPsBack to article page