Fig. 4From: Bioprobes Based on Aptamer and Silica Fluorescent Nanoparticles for Bacteria Salmonella typhimurium DetectionFluorescence images of bacteria S. typhimurium in mixed bacteria samples. a1, b1, and c1 represent the bright-field pictures. a2, b2, and c2 represent the fluorescence microscopy pictures. Scale bar = 5 μmBack to article page