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Understanding the Scale of Microbiology from Coffee Bean to Carbon Atom

November 23rd, 2009 Sean Duffy Net News

CellSizeScreenshot.jpg
The University of Utah’s Genetic Science Learning Center has developed a fun flash application that allows you to quickly zoom from a coffee bean to a carbon atom to see the relative size of cells, cellular components, pathogens, small molecules, and more.
From the University of Utah:

The smallest objects that the unaided human eye can see are about 0.1 mm long. That means that under the right conditions, you might be able to see an ameoba proteus, a human egg, and a paramecium without using magnification. A magnifying glass can help you to see them more clearly, but they will still look tiny.
Smaller cells are easily visible under a light microscope. It’s even possible to make out structures within the cell, such as the nucleus, mitochondria and chloroplasts. Light microscopes use a system of lenses to magnify an image. The power of a light microscope is limited by the wavelength of visible light, which is about 500 nm. The most powerful light microscopes can resolve bacteria but not viruses.
To see anything smaller than 500 nm, you will need an electron microscope. Electron microscopes shoot a high-voltage beam of electrons onto or through an object, which deflects and absorbs some of the electrons. Resolution is still limited by the wavelength of the electron beam, but this wavelength is much smaller than that of visible light. The most powerful electron microscopes can resolve molecules and even individual atoms.

Zoom to understand here…

Sean Duffy

Sean is the Co-Founder and CEO of Omada Health, (http://omadahealth.com), a Silicon Valley startup that aims brings thoughtful and engaging products to disease prevention and health promotion. Prior to Omada Health, Sean was enrolled in Harvard’s joint MD/MBA program, and previously worked in IDEO’s Health & Wellness group driving innovative work for providers, health technology companies, and employers. Sean also spent two years at Google, served as an editor at Medgadget.com, and was recently named as one of the "40 Under 40" top medtech innovators by MDDI. He received his BS from Columbia University.

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