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Related Concept Videos

X-ray Crystallography02:18

X-ray Crystallography

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...
Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal crystal...
Law of Rational Indices01:29

Law of Rational Indices

The Law of rational indices is a fundamental principle in the field of crystallography. According to this law, the intercepts of a crystal face along the crystallographic axes (the three-dimensional axes along which a crystal is measured) can be expressed as either equivalent to the unit intercepts (a, b, c) or simple whole number multiples of them. These multiples are typically denoted as na, n'b, and n''c, where n, n', and n'' are simple whole numbers.To illustrate, consider a crystal with...

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X-ray Powder Diffraction in Conservation Science: Towards Routine Crystal Structure Determination of Corrosion Products on Heritage Art Objects
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Common arc method for diffraction pattern orientation.

Gábor Bortel1, Miklós Tegze

  • 1Research Institute for Solid State Physics and Optics of the Hungarian Academy of Sciences, 1525 Budapest, PO Box 49, Hungary. gb@szfki.hu

Acta Crystallographica. Section A, Foundations of Crystallography
|October 21, 2011
PubMed
Summary
This summary is machine-generated.

A new common arc orientation method enables accurate 3D structure reconstruction from single particle X-ray diffraction data, even with low signal levels. This technique overcomes radiation dose limits for non-periodic objects.

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Area of Science:

  • Structural biology
  • X-ray crystallography
  • Biophysics

Background:

  • X-ray free-electron lasers (XFELs) allow diffraction imaging beyond radiation damage limits.
  • Three-dimensional (3D) structure reconstruction requires determining the orientation of diffraction patterns from single particles.
  • Current orientation methods face challenges with non-periodic objects and low signal-to-noise ratios.

Purpose of the Study:

  • To introduce and validate a novel method for orienting continuous diffraction patterns from non-periodic objects.
  • To address limitations in existing orientation techniques for single particle analysis.

Main Methods:

  • The common arc orientation method utilizes intensity correlations in Ewald sphere intersections.
  • The algorithm incorporates Friedel's law and handles missing diffraction data.
  • It is capable of determining the point group symmetry of objects.

Main Results:

  • Demonstrated high orientation accuracy on simulated diffraction data.
  • Effective performance even at low signal levels, crucial for dose-limited experiments.
  • The method successfully determines object point group symmetry.

Conclusions:

  • The common arc orientation method provides a robust solution for a critical step in single particle 3D structure reconstruction.
  • This technique enhances the capabilities for analyzing non-periodic samples using XFELs.
  • It fills a significant gap in the available orientation methods for structural biology.