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Related Concept Videos

Electron Behavior01:09

Electron Behavior

Electrons are negatively charged subatomic particles attracted to and orbit around the positively-charged nucleus of an atom. They reside in spaces associated with energy levels called shells and are further organized into subshells and orbitals within each shell.
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Overview
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Related Experiment Video

Updated: May 23, 2026

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
08:54

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

Published on: January 25, 2020

ANODE: anomalous and heavy-atom density calculation.

Andrea Thorn1, George M Sheldrick

  • 1Department of Structural Chemistry, University of Göttingen, Tammannstrasse 4, D-37077 Göttingen, Germany.

Journal of Applied Crystallography
|April 6, 2012
PubMed
Summary
This summary is machine-generated.

The ANODE program estimates heavy-atom density by reversing standard phase determination. This method aids in locating weak anomalous scatterers and validating structural models.

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Last Updated: May 23, 2026

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Area of Science:

  • Structural Biology
  • Crystallography
  • Biophysics

Background:

  • Experimental phase determination is crucial for solving protein structures.
  • Current methods like anomalous diffraction and isomorphous replacement have limitations in identifying weak scatterers.

Purpose of the Study:

  • To introduce ANODE, a novel computational program for estimating anomalous or heavy-atom density.
  • To provide an alternative approach for experimental phase determination in crystallography.

Main Methods:

  • ANODE reverses the conventional phase determination process.
  • It subtracts phase shifts from native protein phases to derive heavy-atom substructure phases.
  • Native phases are calculated using existing Protein Data Bank (PDB) structure information.

Main Results:

  • The program successfully estimates anomalous and heavy-atom density.
  • ANODE enables the localization of very weak anomalous scatterers, such as sulfur atoms.
  • The method can identify unknown atoms within a structure.

Conclusions:

  • ANODE offers a valuable tool for identifying and locating anomalous scatterers.
  • Potential applications include validating molecular replacement solutions and identifying unknown atomic components in protein structures.