File:U.S. Department of Energy - Science - 276 003 003 (16625682631).jpg
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[edit]DescriptionU.S. Department of Energy - Science - 276 003 003 (16625682631).jpg |
VIEW OF THE SCANNING TRANSMISSION ELECTRON MICROSCOPE IN BNL'S INSTRUMENTATION DIVISION. THE SCANNING TRANSMISSION ELECTRON MICROSCOPE (STEM) WAS CONSTRUCTED BY RESEARCHERS IN BNL'S BIOLOGY DEPARTMENT TO IMAGE SPECIMENS AND MEASURE THE MASSES OF PROTEINS, NUCLEIC ACIDS AND COMPLEXES OF THE TWO. THE SCANNING TRANSMISSION ELECTRON MICROSCOPE DIFFERS FROM A CONVENTIONAL ELECTRON MICROSCOPE DUE TO ITS ABILITY TO MINIMIZE RADIATION DAMAGE. WITH A SCANNING TRANSMISSION ELECTRON MICROSCOPE, A SPECIMEN IS COOLED TO LIQUID NITROGEN TEMPERATURE AND SCANNED, RATHER THAN BEING IRRADIATED ALL AT ONCE. WHILE PASSING THROUGH THE SPECIMEN, SOME OF THE ELECTRONS INTERACT WITH IT, LOSING ENERGY TO WHATEVER THEY HIT OR CHANGING THEIR COURSE. DETECTORS COUNT EVERY TRANSMITTED ELECTRON, AND EACH ELECTRON CONTRIBUTES TO THE FINAL PICTURE. AS A RESULT,FEWER ELECTRONS ARE NEEDED TO RECORD AN IMAGE THAN WITH OTHER ELECTRON MICROSCOPES, SO RADIATION DAMAGE TO THE SAMPLE IS MINIMIZED. THE PROCESS PERMITS SCIENTISTS TO SCRUTINIZE BIOLOGICAL SPECIMENS AT A RESOLUTION OF 2.5 ANGSTROMS. STEM CAN ALSO DETERMINE MOLECULAR WEIGHT AND MASS DISTRIBUTION WITHIN SINGLE MACROMOLECULES AND COMPLEXES.
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Date | |
Source | 276 003 003 |
Author | U.S. Department of Energy from United States |
Licensing
[edit]Public domainPublic domainfalsefalse |
This image is a work of a United States Department of Energy (or predecessor organization) employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain.
Please note that national laboratories operate under varying licences and some are not free. Check the site policies of any national lab before crediting it with this tag. العربية ∙ English ∙ français ∙ 日本語 ∙ македонски ∙ മലയാളം ∙ Nederlands ∙ русский ∙ українська ∙ Tiếng Việt ∙ 简体中文 ∙ 繁體中文 ∙ +/− |
This image was originally posted to Flickr by U.S. Department of Energy at https://flickr.com/photos/37916456@N02/16625682631. It was reviewed on 22 November 2017 by FlickreviewR 2 and was confirmed to be licensed under the terms of the United States Government Work. |
22 November 2017
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current | 00:35, 22 November 2017 | 3,200 × 2,560 (816 KB) | Rudolphous (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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