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(a) Microscope image of an electrospun PVA/copper nanofiber web showing the inhibition zone against E. coli after 24 h, following a qualitative test procedure adapted from standard ISO 201645. Inhibition zone measured of 1.2 mm. (b) SEM micrograph of the nanofiber web after anti-bacterial test. (insert) SEM micrograph of the reference nanofiber web.
