Wound dressing. Coloured scanning electron micrograph (SEM) of polyurethane (PU) foam wound dressing. This type of dressing has a water and germ-proof outer layer, but allows the wound to breathe and is able to absorb any exudate from the wound. This creates an environment around the wound that hastens the healing time and minimises scars. Magnification: x20 when printed at 10 centimetres wide.
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