Fig. 2
From: Direct electrophoretic microRNA preparation from clinical samples using nanofilter membrane
Nanofilter membrane fabrication. a Fabrication steps of the nanofilter membrane device. The image is not in scale. b A photograph of the nanofilter membrane device, the front side (left) and the backside (right). The square membrane is located at the center, having 700 μm width. The size of the chips is 1 cm × 1 cm. c A scanning electron microscope (SEM) image of the uniform arrangement of the nanopores in the nanofilter membrane. The scale bar indicates 1 μm