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.
1A flat strip of land, raised bank, or terrace bordering a river or canal. âThe building hovers above a stabilised berm, turning with the river to reinforce landform and contour.â. âWith the creek barrier now open and a solid berm built across the avulsion channel, the heavy rains return.â. âThey constructed stone filter berms around all storm water drains and cleaned and relined two settling ponds with stone in an effort to improve the quality of stormwater being discharged to Lake Huron.â.