2.7 Electron microscopy observation
Took 20 µl of virus suspension with a pipet-gun and dropped onto the
copper grid with carbon film for 3-5min, and then use filter
paper to absorb the excess liquid. Dropped 2% phosphotungstic acid on
the copper grid to stain for 1-2min, use filter paper to absorb excess
liquid, and dry at room temperature. The cuprum grids are observed under
TEM and take images.