Comments on: Molecular Electron Holography: Progress toward atomic-resolution imaging? http://metamodern.com/2009/10/20/molecular-electron-holography-progress-toward-atomic-resolution-imaging/ The Trajectory of Technology Mon, 21 May 2012 05:21:54 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Jeffrey Soreff http://metamodern.com/2009/10/20/molecular-electron-holography-progress-toward-atomic-resolution-imaging/comment-page-1/#comment-1948 Jeffrey Soreff Thu, 22 Oct 2009 16:24:52 +0000 http://metamodern.com/?p=5162#comment-1948 The 260 eV energy is getting close to the carbon 1s x-ray absorbtion edge around 285 eV. I'm not sure if DNA has any accessible states that could lower that energy by 25 eV, though... The 260 eV energy is getting close to the carbon 1s x-ray absorbtion edge around 285 eV. I’m not sure if DNA has any accessible states that could lower that energy by 25 eV, though…

]]> By: uberVU - social comments http://metamodern.com/2009/10/20/molecular-electron-holography-progress-toward-atomic-resolution-imaging/comment-page-1/#comment-1946 uberVU - social comments Thu, 22 Oct 2009 09:20:13 +0000 http://metamodern.com/?p=5162#comment-1946 <strong>Social comments and analytics for this post...</strong> This post was mentioned on Friendfeed by Alexander Kruel: Molecular Electron Holography: Progress toward atomic-resolution imaging? - http://metamodern.com/2009...... Social comments and analytics for this post…

This post was mentioned on Friendfeed by Alexander Kruel: Molecular Electron Holography: Progress toward atomic-resolution imaging? – http://metamodern.com/2009…...

]]> By: Chris Phoenix http://metamodern.com/2009/10/20/molecular-electron-holography-progress-toward-atomic-resolution-imaging/comment-page-1/#comment-1945 Chris Phoenix Wed, 21 Oct 2009 17:09:12 +0000 http://metamodern.com/?p=5162#comment-1945 The paper says that 230 eV leaves the DNA undamaged, but 260 eV destroys it in seconds. Fascinating. Any speculations on why a 10% change in energy would make such a difference? I'd guess some kind of coupling effect, but of course it's hard to imagine what would couple at 260 eV. Also don't miss this paper: <a href="http://www.atypon-link.com/OLD/doi/abs/10.1524/zpch.2008.6008?cookieSet=1&journalCode=zpch" rel="nofollow">http://www.atypon-link.com/OLD/doi/abs/10.1524/zpch.2008.6008?cookieSet=1&journalCode=zpch</a> DNA ropes were imaged at 40 eV; published in 2008. It says their microscope has a depth of focus of 40 nm, with reproducible features appearing as they change the sample distance. The paper says that 230 eV leaves the DNA undamaged, but 260 eV destroys it in seconds. Fascinating. Any speculations on why a 10% change in energy would make such a difference? I’d guess some kind of coupling effect, but of course it’s hard to imagine what would couple at 260 eV.

Also don’t miss this paper:
http://www.atypon-link.com/OLD/doi/abs/10.1524/zpch.2008.6008?cookieSet=1&journalCode=zpch

DNA ropes were imaged at 40 eV; published in 2008. It says their microscope has a depth of focus of 40 nm, with reproducible features appearing as they change the sample distance.

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