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Related Concept Videos

X-ray Crystallography02:18

X-ray Crystallography

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
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Related Experiment Video

Updated: Jan 28, 2026

Microfluidic Chips for In Situ Crystal X-ray Diffraction and In Situ Dynamic Light Scattering for Serial Crystallography
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Resolving indexing ambiguities in X-ray free-electron laser diffraction patterns.

Monarin Uervirojnangkoorn1, Artem Y Lyubimov2, Qiangjun Zhou3

  • 1Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.

Acta Crystallographica. Section D, Structural Biology
|March 2, 2019
PubMed
Summary

An automated method resolves indexing ambiguities in X-ray free-electron laser (XFEL) diffraction data, improving data merging and atomic model refinement for structural biology. This technique enhances XFEL data processing efficiency.

Keywords:
XFELsindexing ambiguityserial crystallography

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Area of Science:

  • Crystallography
  • Structural Biology
  • Biophysics

Background:

  • X-ray free-electron laser (XFEL) diffraction imaging faces challenges due to sample damage and partial data per pulse.
  • Indexing ambiguities can complicate data processing when lattice symmetry exceeds space group symmetry or unit cells are similar.

Purpose of the Study:

  • To develop and validate an automated method for diagnosing and correcting indexing ambiguities in XFEL diffraction data.
  • To improve the quality of merged diffraction data and the accuracy of atomic model refinement.

Main Methods:

  • Implementation of the Brehm-Diederichs algorithm for automated diagnosis of indexing ambiguities.
  • Application of the method to an XFEL data set from the neuronal SNARE-complexin-1-synaptotagmin-1 complex.

Main Results:

  • The automated method successfully produced consistent indexing choices for a majority of XFEL diffraction images.
  • Correction of indexing ambiguities led to significant improvements in data merging statistics.
  • Enhanced merging statistics resulted in improved R values during atomic model refinement.

Conclusions:

  • The presented automated method effectively addresses indexing ambiguities in XFEL data processing.
  • This tool offers a valuable improvement for the analysis of XFEL diffraction datasets.
  • The method contributes to more accurate and efficient structural determination of biological macromolecules using XFELs.