It was a little like electron microscopy, but one step further along the line.

This led to his first use of electron microscopy, in which he became a leading authority.

"You mean the electron microscopy showed no virus at all?"

This theory was confirmed through the use of electron microscopy in the late 1950s.

At this point, electron microscopy can no longer penetrate the wall.

The choice of negative stain in electron microscopy can be very important.

This was demonstrated more than 50 years later thanks to the emergence of electron microscopy.

However in electron microscopy they appear very thin and bell shaped.

Using electron microscopy, they saw the virus inside the marrow cells.

But her interest in electron microscopy led her to keep working and publishing.