Electron Microscopes Essay Example | Topics and Well Written Essays - 1250 words

Electron Microscopes - Essay ExampleBut, unlike the ordinary microscopes, the negatron microscope uses a ray of electrons (Miller and Levine, 2003) which is shorter in wavelength, traveling through a vacuum, and center by magnets to very thin objects whose sizes needs to be magnified. Also, the electron microscopes canful only magnify specimens that have been properly killed, processed, and mounted for viewing (Engelkirk and Burton, 2007).There ar two types of electron microscopes. These argon the transmitting electron microscope (Figure 1) and the scanning electron microscope (Figure 2). The transmission electron microscope allows the viewer to see the internal separate of a microorganism at 1 million quantify size magnification (Figure 3). On the other hand, the scanning electron microscope allows the viewer to see the external get on parts of a microorganism at approximately 20 nano meter resolution (Figure 4). These two types of electron microscopes have each a built-in ca mera that can take pictures of images under study. So, besides visibility reasons, specimens are usually stained for more accurate observations, but the micrographs or pictures are black and white (Engelkirk and Burton, 2007.The introductory parts of... nsmission electron microscope are high voltage electrical supply line, electron gun, first condenser lens, condenser aperture, second condenser lens, specimen holder, with air-lock, physical object lenses and aperture, and fluorescent screen with camera (Figure 5). On the other hand, the basic parts of scanning electron microscope are Control console, electron guns, thermo ionic electron gun, theater of operations ionic gun, thermal field emitters, Schottky emitter, and vacuum system vacuum pumps, roughing pump/mechanical pump, diffusion pump, turbo pump, ion pump (CEMS) (Chemical Engineering and Material Science, 2003). Biologist use transmission microscope to emit a ray of electrons from side to side of a thin sample that has to be examined for its internal structure. In contrast, biologist use scanning electron microscope to emit a fiber-thin electron ray across the surface of the sample producing a clear picture of the surface structure (Miller and Levine, 2003).Conclusion Electron microscopes are biomedical laboratory instruments that enable biologist to accurately configure the internal and external structure of microorganism which were considered in the past as invisible organisms. pic by Ernst Ruska. 1980, BerlinFigure 1 Transmission electron microscope Source Epner Technology Inc. ISO 9001. 2000,NADCAPFigure 2 Scanning electron microscope Title General Cytology Publisher W.B. Saunders payoff Date 1960Figure 3 The transmission electron microscope allows the viewer to see the internal parts of a microorganism at 1 million times size magnificationTitle General Cytology Publisher W. B. Saunders Publication Date 1960 Figure 4 Scanning electron microscope allows the viewer to see the external surface pa rts of a