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.
WordReference Random House Unabridged Dictionary of American English Â© 2017. banâ¢quette (bang ketâ²; locally bangâ²kit for 3),USA pronunciation n. Furniturea long bench with an upholstered seat, esp. one along a wall, as in a restaurant. Civil Engineeringan embankment for buttressing the base of a levee and forming a berm. Dialect Terms[Chiefly Coastal Louisiana and East Texas.]a sidewalk, esp. a raised one of bricks or planks. [Fort.]a platform or step along the inside of a parapet, for soldiers to stand on when firing.