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X-ray crystallography - Electron-density map

  1. Aug 30, 2014 #1
    1. The problem statement, all variables and given/known data

    Hello, i have the following task in my homework:

    When doing an X-ray crystallography experiment to determine the structure of biomolecules (protein/DNA), why do consider interpreting an electron-density map (EDM) instead of directly using the diffraction data?

    2. The attempt at a solution

    I searched and read through a lot of papers and other sources of information, but in all of them an EDM is created to construct an all atom model of the desired biomolecule. What is meant with "directly using diffraction data" ? As far as i understood, all you have is amplitude and (approximated) phase information after analyzing the series of diffraction patterns. What other way exists for structure determination besides creating an EDM as the Fourier transform of amplitudes and phases?
    I hope that someone can help me with this task.

    Thank you very much in advance for any kind of help
  2. jcsd
  3. Sep 15, 2014 #2
    I'm sorry you are not finding help at the moment. Is there any additional information you can share with us?
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