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Related Concept Videos

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...

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Updated: May 7, 2026

Small and Wide Angle X-Ray Scattering Studies of Biological Macromolecules in Solution
12:53

Small and Wide Angle X-Ray Scattering Studies of Biological Macromolecules in Solution

Published on: January 8, 2013

Anomalous small-angle X-ray scattering: analyzing correlations and fluctuations in polyelectrolytes.

M Ballauff1, A Jusufi

  • 1Physikalische Chemie I, University of Bayreuth, 95440 Bayreuth, Germany.

Colloid and Polymer Science
|September 24, 2013
PubMed
Summary

Anomalous small-angle X-ray scattering (ASAXS) provides detailed structural insights into fluctuating systems by analyzing partial intensities. This technique reveals strong correlations between counterions and macroions, offering information beyond conventional scattering methods.

Keywords:
ASAXSCounterion condensationPolyelectrolyteSAXS

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Last Updated: May 7, 2026

Small and Wide Angle X-Ray Scattering Studies of Biological Macromolecules in Solution
12:53

Small and Wide Angle X-Ray Scattering Studies of Biological Macromolecules in Solution

Published on: January 8, 2013

Assembly and Characterization of Polyelectrolyte Complex Micelles
08:44

Assembly and Characterization of Polyelectrolyte Complex Micelles

Published on: March 2, 2020

Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering
07:19

Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering

Published on: November 5, 2018

Area of Science:

  • Materials Science
  • Physical Chemistry
  • Biophysics

Background:

  • Conventional small-angle scattering (SAS) provides limited information on complex systems.
  • Anomalous small-angle X-ray scattering (ASAXS) offers enhanced structural resolution.
  • ASAXS leverages the energy-dependent scattering length near absorption edges.

Purpose of the Study:

  • To review recent structural investigations using ASAXS.
  • To demonstrate the value of analyzing three partial intensities from ASAXS data.
  • To showcase ASAXS's capability in revealing correlations in fluctuating systems.

Main Methods:

  • Anomalous small-angle X-ray scattering (ASAXS) technique.
  • Analysis of three partial intensities derived from ASAXS data.
  • Application to molecular dynamics simulations and experimental data of charged colloidal spheres and polyelectrolytes.

Main Results:

  • ASAXS analysis yields three partial intensities, providing valuable information in fluctuating systems.
  • Demonstrated successful application to molecular dynamics simulations of charged colloidal spheres.
  • Experimental ASAXS data of rod-like polyelectrolytes allowed determination of partial intensities, showing quantitative agreement with the Poisson-Boltzmann cell model.

Conclusions:

  • ASAXS provides unique structural information not accessible by conventional SAS.
  • The method reveals strong correlations between counterions and macroions in polyelectrolyte systems.
  • ASAXS is a powerful tool for investigating complex fluctuating systems at a molecular level.