Essay on Transmission Electron Microscope

Submitted By fukdfuighrdfg

Words: 391

Pages: 2

Open Document

An electron microscope is a magnifier that uses electrons to enlighten the subject and display a magnified image. The electron microscope has a greater amount of resolution as compared to other microscopes. Using this, smaller objects can be seen with a naked eye as they have lesser wavelength than light, hence it has a very strong resolving power to view the object in a larger picture. This microscope is much better and more efficient than the crappy light microscope which can only magnify up to 1000 to 2000 times compared to the electron which can magnify up to 2 milion times. Although it may be expensive it is worth it as the electron microscopes have much better resolving power than light micrscopes. Better resolution allows you to see the details of the membrane (after staining), such as the bilayer structure, which are too small to be seen by light microscopy.
There are mainly two types of microscopes. One is a Transmission Electron Microscope (TEM), and the other is the Scanning Electron Microscope (SEM). Let us first understand how an electron microscope works?
The TEM was the first ever electron microscope and it was used to see within the cells. The TEM allows only those electrons to be viewed which pass through the subject, which obviously means that only those electrons which pass through the sample may be seen. This gives rise to black/white and shades of gray on the finished picture.
The electron is a pin-shaped cathode, heated to an extent which induces a beam of electrons to be

Microscopes: Scanning Electron Microscope Essay

between two objects, the higher the resolution the greater the detail. Electron microscopes have some advantages over optical microscopes: The biggest advantage is that they have a higher resolution and therefore also have a higher magnification (Up to 2000000 times). Light microscopes can only 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 visualisation of structures that would normally…

Words 714 - Pages 3

Essay about Comparing and Contrasting Microscopes

A microscope is an optical instrument that magnifies objects that are too small to be seen by the naked eye. Microscopes are used by a variety of science related fields such as engineering. For example a biologist and botanist use microscopes to look at cells. Engineers use microscopes to examine fracture patterns in metals. Basically anyone can use a microscope to examine small objects but scientists and researchers use microscopes on a daily basis. There are a variety of microscopes available such…

Words 766 - Pages 4

Essay about Electron Microscope

properties between the Electron microscope and the Light microscope. The invention of the microscope played a vital step in the progression of science as a whole and has allowed scientists to see structures not visible to the naked eye. Cells were first seen in 1665 by Robert Hooke and scientists have since been able to discover the existence of microorganisms, study the structure of cells and see smaller structures of plants than ever before. With the improved electron microscope developed in the 1930’s…

Words 777 - Pages 4

Electron Microscope and Specimens Essay

Light and Electron Microscope Abstract: The question I am testing is which microscopes is the best for magnification. The microscopes I will be testing are light, transmission electron and scanning electron microscopes. I chose 4 different factors to consider when testing my question, which is magnification, colour image, ease of preparing specimens and ability to view living specimens. From my results the Scanning Electron Microscope is the best for magnification. However light microscopes are best…

Words 1018 - Pages 5

Essay On Electron Microscope

Transmission Electron Microscope Introduction For analysis of materials of very small dimensions like quantum dots, quantum wires, nano tubes, nano dots, fullerenes etc. we need special kind of microscopes. As photons of light have wavelengths larger than that of most of the nanomaterials, optical microscopes doesn’t have magnification power or resolution capabilities to cater these materials. For this purpose electron microscopes, which uses electrons having shorter wavelengths, like Transmission…

Words 983 - Pages 4

State The Resolution And Magnification That Can Be Achieved By A Light Microscope

F211 Biology Questions Module 1 Cells 1. State the resolution and magnification that can be achieved by a light microscope. * The maximum magnification that can be achieved by a light microscope is x1500 and the maximum resolution is 200nm. The limit of resolution is due to the magnitude of the wavelength of light. Two objects can be distinguished only if light waves can pass between them. 2. Explain the difference between magnification and resolution. * Magnification is the degree…

Words 475 - Pages 2

Essay on Electron Microscopes

Microscopes A microscope is a tool scientist use to see living or non-living things that cannot be seen by the naked eye. There are two main types of microscopes. They are light microscopes and electrons microscopes. Light microscopes produce magnified images by focusing visible light rays. Compound light microscopes allow light to pass through using two lenses to form an image. Electron microscopes produce magnified images by producing beams of electrons. Biologist uses two main types…

Words 713 - Pages 3

Micro Md2d1 Essay example

types of light and electron microscopes discussed in Chapter 3 that are used to study microorganisms? Focus your response in terms of the following parameters: Range of magnification Resolving ability Sample preparation Possible states of sample (e.g. whole organism, part of, living, non-living, etc.) Electron microscopes use electrons not protons (light rays) for visualization. They have higher resolution and higher magnification up to 1000-2000 times. The electron microscope has a higher resolving…

Words 841 - Pages 4

Microscopy: Scanning Electron Microscope and Max Resolu 5 on Essay

Useful for… Viewing 5ssues that absorb light Not useful for… Example of image Transparent or colorless 5ssues that don’t absorb light Set up Condensor and objec5ve Sample is stained DIC/ Nomarski Align the light microscope for color illumina5on and then place the DIC elements in the op5cal path, when lights don’t interfere they appear dark, while when there is an edge of the structure, the beams are altered and when the beams combine via the second prism…

Words 696 - Pages 3

Essay about bio ch 1

genetic make-up -Before the microscope... Earliest biologists began by looking at tissues and cells, then breaking them open to try to see their contents -Microscope invented by Robert Hooke (viewed slices of cork, coining the term ‘cell’) -Anton van worked with glass and improved quality of lenses (to 300x magnification) and became first of observe bacteria from his mouth (“father of microbiology), protists from pond water, blood cells, sperm -Light microscope: microscope that uses visible light…

Words 810 - Pages 4