That Is An Electronic Microscope

Although the sense of sight in humans is very developed, we know that we cannot observe all the objects and organisms that shows us the nature. For this reason, the microscopes were invented more or less, a 500 years ago. During the years this great invention has been perfected to achieve greater precision results. At beginning of the twentieth century is invented what we know today as the electron microscope that can magnify images up to 7000 times, working with electrons instead of light, or photons. Its operation consists of a cathode ray tube, that is heated it emits electrons making a beam that is reflected in the lens of the condenser and directs it towards the object or organism that is observing, expanding the image through the projection lens. This kind of microscopes has many advantages, among them, produces crisp images and high resolution, you can determine different refractive indices and see the thickness of some cellular structures. Some disadvantages that are presented are the high cost of the equipment or the care that should be taken when handling reagents that are used, since they are highly toxic. Since its creation, many biological structures were discovered, and there have been many advances in cell biology, but not only electron microscope is also used in this area, has been useful for Geology, study and analysis of materials, metallurgy, dentistry, paleontology and archaeology, quality control, expert reports, forensic, botanical medicine, biomedicine and medicine.

There are two types of microscopes, scanning (SEM) and transmission (TEM). The MEB is used to view and examine the surface of objects, while the MET allows you to view objects in ultra fine cuts. In both models reproduced images may be in black and white or you can choose colours give using a computer. The sale of microscopes are made in specialized places and your purchase must be made by taking certain precautions. One important point that should be considered before making a purchase is that their structure is metal, plastic structures have a shorter life. It is always prudent to consult with experts before making a purchase to ensure that the product you are purchasing is correct for you and the use that want to give.