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Radiation: Applications01:17

Radiation: Applications

The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
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The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
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Modelling and refining site-specific radiation damage in SAD/MAD phasing.

M Schiltz1, G Bricogne

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Site-specific radiation damage in X-ray crystallography can provide extra phase information for anomalous diffraction (SAD/MAD) experiments. This method models damage evolution in real space, improving phasing power from intensity differences.

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Area of Science:

  • Crystallography
  • Structural Biology
  • Biophysics

Background:

  • Standard anomalous diffraction methods (SAD/MAD) can be enhanced by utilizing site-specific radiation damage.
  • Radiation damage is a critical factor affecting data quality in X-ray crystallography.

Purpose of the Study:

  • To review the fundamentals of using site-specific radiation damage for phasing.
  • To present models describing site-specific radiation damage evolution.
  • To analyze the impact of overall radiation damage on phasing quality.

Main Methods:

  • Data kept unmerged until Harker construction.
  • Explicit modeling and real-space refinement of site-specific radiation damage.
  • Utilizing intensity differences from symmetry-related reflections or repeated measurements at varying X-ray doses.

Main Results:

  • Phasing power is generated by exploiting intensity differences caused by site-specific radiation damage.
  • Different models for describing site-specific radiation damage are presented.
  • Overall radiation damage can limit phase quality when its timescale matches damage evolution or data collection time.

Conclusions:

  • Site-specific radiation damage offers a viable strategy for augmenting phase information in SAD/MAD experiments.
  • Accurate modeling of radiation damage is crucial for successful phasing.
  • The interplay between site-specific and overall radiation damage must be considered for optimal results.