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.
A corm is a shortened, fleshy, erect underground stem with inconspicuous scale-like leaves. It closely resembles, and is often mistakenly identified as, a bulb (as the bulbs of Gladiolus and Crocus), but actually it is distinguished by being more accurately a modified stem.ladiolus, Freesia, Tritonia and Caladium all grow from corms. Corms are frequently used to propagate a plant by digging them out of the ground, then cutting the corms into individual sections and replanting. Each section of the corm that has at least a single bud can usually generate a new corm.