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Related Concept Videos

Overview of Electron Microscopy01:25

Overview of Electron Microscopy

The wavelengths of visible light ultimately limit the maximum theoretical resolution of images created by light microscopes. Most light microscopes can only magnify 1000X, and a few can magnify up to 1500X. Electrons, like electromagnetic radiation, can behave like waves, but with wavelengths of 0.005 nm, they produce significantly greater resolution up to 0.05 nm as compared to 500 nm for visible light. An electron microscope (EM) can create a sharp image that is magnified up to 2,000,000X.

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Related Experiment Video

Updated: May 18, 2026

Sample Preparation and Transfer Protocol for In-Vacuum Long-Wavelength Crystallography on Beamline I23 at Diamond Light Source
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Sample Preparation and Transfer Protocol for In-Vacuum Long-Wavelength Crystallography on Beamline I23 at Diamond Light Source

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How good can our beamlines be?

Dorothee Liebschner1, Miroslawa Dauter, Gerold Rosenbaum

  • 1Synchrotron Radiation Research Section, MCL, National Cancer Institute, Argonne National Laboratory, Argonne, IL 60439, USA.

Acta Crystallographica. Section D, Biological Crystallography
|September 21, 2012
PubMed
Summary
This summary is machine-generated.

A multiple-image X-ray diffraction experiment helps evaluate experimental setup performance. This method distinguishes crystal and equipment errors, enabling accurate assessment of data collection facility capabilities.

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Area of Science:

  • Crystallography
  • Structural Biology
  • X-ray Diffraction Data Analysis

Background:

  • X-ray diffraction data accuracy is influenced by crystalline sample properties and data-collection facility performance.
  • Evaluating experimental setup performance is challenging due to crystal properties like mosaicity, non-uniformity, and radiation damage affecting intensity measurements.
  • Traditional rotation mode data collection can obscure the true performance of the experimental setup.

Purpose of the Study:

  • To develop and validate a method for objectively assessing X-ray diffraction data-collection facility performance.
  • To differentiate between errors arising from crystal properties and those from the experimental setup.
  • To establish a reliable approach for estimating reflection uncertainties and evaluating data quality.

Main Methods:

  • A multiple-image experiment was conducted, recording 100 analogous diffraction frames consecutively at the same crystal orientation.
  • Thaumatin crystal diffraction images were collected on the SBC beamline 19BM at the Advanced Photon Source (APS).
  • Analysis focused on the behavior of reflection intensities across the series of images to minimize crystal property influence.

Main Results:

  • The multiple-image experiment effectively minimized the influence of sample properties on intensity measurements.
  • An objective method for estimating reflection uncertainties was developed by analyzing intensity variations over consecutive frames.
  • The experiment successfully decomposed random and systematic errors, aiding in the evaluation of data-collection facility performance.
  • Intensity variation plots revealed the stability of the beam, beamline elements, and detector.

Conclusions:

  • The multiple-image experiment is a simple and effective method for evaluating X-ray diffraction data-collection facility performance.
  • This technique allows for the assessment of the highest potential data quality achievable at a specific beamline.
  • It provides a robust approach to understanding and improving the reliability of crystallographic data collection.