Electron microscope
hideAn electron microscope is a type of microscope that uses a particle beam of electrons to illuminate a specimen and create a highly-magnified image. Electron microscopes have much greater resolving power than light microscopes that use electromagnetic radiation and can obtain much higher magnifications of up to 2 million times, while the best light microscopes are limited to magnifications of 2000 times. Both electron and light microscopes have resolution limitations, imposed by the wavelength of the radiation they use. The greater resolution and magnification of the electron microscope is because the wavelength of an electron; its de Broglie wavelength is much smaller than that of a photon of visible light.
The electron microscope uses electrostatic and electromagnetic lenses in forming the image by controlling the electron beam to focus it at a specific plane relative to the specimen. This manner is similar to how a light microscope uses glass lenses to focus light on or through a specimen to form an image.
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News tagged with electron microscopy
Computational microscope peers into the working ribosome (w/ Video)
Nov 23, 2009 |
4.9 / 5 (9) |
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Two new studies reveal in unprecedented detail how the ribosome interacts with other molecules to assemble new proteins and guide them toward their destination in biological cells. The studies used molecular ...
RNA on the move
Nov 26, 2009 |
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In the fruit fly Drosophila, oskar mRNA, which is involved in defining the animal’s body axes, is produced in the nuclei of nurse cells neighbouring the oocyte, and must be transported to the oocyte and along ...
Small nanoparticles bring big improvement to medical imaging
Nanotechnology / Bio & Medicine
Nov 18, 2009 |
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If you're watching the complex processes in a living cell, it is easy to miss something important—especially if you are watching changes that take a long time to unfold and require high-spatial-resolution ...
Understanding mechanical properties of silicon nanowires paves way for nanodevices
Nanotechnology / Nanomaterials
Nov 11, 2009 |
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Silicon nanowires are attracting significant attention from the electronics industry due to the drive for ever-smaller electronic devices, from cell phones to computers. The operation of these future devices, ...
Imaging a catalyst one atom at a time
Nanotechnology / Nanomaterials
Nov 09, 2009 |
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(PhysOrg.com) -- The catalytic processes that facilitate the production of many chemicals and fuels could become much more environmentally friendly thanks to a breakthrough achieved by researchers from Lehigh ...
Scientists Image the 'Anatomy' of a Molecule (w/ Video)
Aug 28, 2009 |
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(PhysOrg.com) -- For the first time, IBM researchers in Zurich, Switzerland, have taken a 3D image of an individual molecule. Using an atomic force microscope, the researchers constructed a "force map" of ...
To peer inside a living cell
Oct 06, 2009 |
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(PhysOrg.com) -- Quantum mechanics could help build ultra-high-resolution electron microscopes that won't destroy living cells, according to MIT electrical engineers.
Researchers Record First Real-Time Direct Observations of Nanocrystal Growth in Solution (w/ Video)
Aug 07, 2009 |
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(PhysOrg.com) -- The veil is being lifted from the once unseen world of molecular activity. Not so long ago only the final products were visible and scientists were forced to gauge the processes behind those ...
Gene mutation may reveal clues for treating lung diseases
Oct 15, 2009 |
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(PhysOrg.com) -- A genetic mutation found in four children born with multiple abnormalities may provide insight into potential treatments for newborn lung distress and chronic obstructive pulmonary disease (COPD).
Silence of the genes
Oct 13, 2009 |
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The molecular architecture of a protein complex that helps determine the fate of human cells has been imaged for the first time by researchers with the U.S. Department of Energy's Lawrence Berkeley National ...
Neurons found to be similar to Electoral College
Medicine & Health / Neuroscience
Sep 14, 2009 |
4.2 / 5 (5) |
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A tiny neuron is a very complicated structure. Its complex network of dendrites, axons and synapses is constantly dealing with information, deciding whether or not to send a nerve impulse, to drive a certain action.
A safe approach to nanotechnology: Boiling up zinc oxide nanorods without toxic solvents
Nanotechnology / Nanomaterials
Aug 19, 2009 |
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A non-toxic and environmentally friendly way to make tiny nanorods of zinc oxide has been developed for the first time by researchers in Saudi Arabia. The approach, described in the current issue of the International Journal of ...
Scientists get detailed glimpse of chemoreceptor architecture in bacterial cells
Sep 24, 2009 |
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Using state-of-the-art electron microscopy techniques, a team led by researchers from Caltech has for the first time visualized and described the precise arrangement of chemoreceptors—the receptors that sense ...
Extremophile Yields a Key Cog in Life's Protein Factory
Sep 10, 2009 |
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(PhysOrg.com) -- Peering at single molecules within an organism that makes its home near thermal vents, Yale University scientists have discovered the structure of a key player in the creation of protein-making ...
Seeing the small picture: X-ray nanoprobe pushes observation to ever smaller frontiers
Mar 02, 2009 |
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(PhysOrg.com) -- Try to picture putting some atoms under a microscope. Even if you could pick them up, put them on a slide and get them to stay still, you still could not see them with even the most powerful ...
