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Fig. 4. (a) Optical images of E. densa treated with water, ALA1, ALAAgNP7, ALAAgFeNP10, ALAAgNP6, ALAAgFeNP3 (objective 100×). (b) Scanning electron microscopy images for ALAAgNP7 and ALAAgFeNP10 (50 μm and 1 μm scales) and energy dispersive spectroscopy (EDS) indicates the presence of silver in leaves.