Français
3. Using anomalous diffusion
The interaction of X-rays with a given atom j is modeled by a scattering factor f j which characterizes the scattering of the atom, taking that of a free electron as the unit. Under many conditions, f j is a real number, i.e. there is no phase difference between the wave scattered by the atom and that scattered by a free electron (Thompson scattering). In reality, the electrons of an atom are not free, but are distributed in orbitals of given energies, and the atom presents absorption discontinuities corresponding to the excitation of deep electronic layers. The approximations of classical theory are no longer justified if the incident X-ray energy is close to the atom's absorption threshold. A resonance phenomenon is triggered, resulting in a phase change of...
The Ultimate Scientific and Technical Reference
This article is included in
Bioprocesses and bioproductions
This offer includes:
Knowledge Base
Updated and enriched with articles validated by our scientific committees
Services
A set of exclusive tools to complement the resources
Practical Path
Operational and didactic, to guarantee the acquisition of transversal skills
Doc & Quiz
Interactive articles with quizzes, for constructive reading
Using anomalous diffusion
Molecular replacement
Bibliography
Bibliography
Websites
Integrative structural biology
on a European scale, Instruct-ERIC https://www.structuralbiology.eu
a French infrastructure, FRISBI http://frisbi.eu
Biocrystallography reference...
Software tools
Data collection :
• HKL2000/HKL3000, MOSFLM, XDS
• expert systems: xia2, autoproc
Phasing MIR, MAD, SAD
• SHARP, SOLVE, CRANK2,SHELX
Molecular replacement :
• Phaser, Molrep, AMoRe, ARCIMBOLDO
• expert systems: MrBUMP, BALBES, MoRDa, AMPLE, SIMBAD...
The Ultimate Scientific and Technical Reference
