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examination of minute objects by use of an electron microscope.
a technique using an electron microscope in which a beam of electrons is focused by an electromagnetic lens and directed onto an extremely thin specimen. The electrons emerging are focused and directed by a second lens onto a fluorescent screen. The magnified image produced is 1000 times greater than that produced by an optic microscope and well resolved, but it is two-dimensional because of the thinness of the specimen. Also called transmission electron microscopy. Compare scanning electron microscopy, transmission scanning electron microscopy.
e·lec·tron mi·cros·co·py(ē-lektron mī-kroskŏ-pē)
Examination of minute objects by use of an electron microscope.
electron microscopyA method of producing a greatly enlarged image of very small objects by using a beam of accelerated electrons instead of light. Modern instruments enable objects smaller than 1nm (one millionth of a millimetre) to be seen. This is almost down to atomic level. Focusing is done by means of magnetic fields obtained from charged plates or current-carrying coils. These fields act as lenses. Electron microscopes are essential tools in medical research and diagnosis.
any of the negatively charged particles arranged in orbits around the nucleus of an atom and determining all of the atom's physical and chemical properties except mass and radioactivity. Electrons flowing in a conductor constitute an electric current; when ejected from a radioactive substance, they constitute the beta particles.
the stream of electrons that flows from the anode to the cathode in the x-ray tube and then interacts with the tungsten target to produce x-rays.
a molecule associated with membrane-bound proteins that accepts and transfers electrons.
photographic images of electron microscopic fields.
see electron microscope.
technology of using an electron microscope.