Electron microscopes have certain advantages over optical microscopes: The biggest advantage is that they have a higher resolution and are therefore also able of a higher magnification (up to 2 million times). Light microscopes can show a useful magnification only up to 1000-2000 times. This is a physical limit imposed by the wavelength of the light. Electron microscopes therefore allow for the visualization of structures that would normally be not visible by optical microscopy.
berm (plural berms) A narrow ledge or shelf, as along the top or bottom of a slope. A raised bank or path, especially the bank of a canal opposite the towpath. A terrace formed by wave action along a beach. A mound or bank of earth, used especially as a barrier or to provide insulation.
Watch the effects of weather on your planned berm area. In some cases, a low-lying, chronically-damp area will determine the location of the berm. In other cases, you may find out that your proposed location captures the sun, but also takes severe wind during a storm. Remove turf from the area. Save it to replace on the berm slope, or use turf chunks to patch other parts of your lawn. Store turf in a plastic bag--damp, if it must wait several days for replanting.