International
Tables for
Crystallography
Volume F
Crystallography of biological macromolecules
Edited by M. G. Rossmann and E. Arnold

© International Union of Crystallography 2006
International Tables for Crystallography (2006). Vol. F. ch. 11.5, p. 240   | 1 | 2 |

Section 11.5.7.5. Anisotropic mosaicity

C. G. van Beek,a‡ R. Bolotovskya§ and M. G. Rossmanna*

a Department of Biological Sciences, Purdue University, West Lafayette, IN 47907-1392, USA
Correspondence e-mail:  mgr@indiana.bio.purdue.edu

11.5.7.5. Anisotropic mosaicity

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Refinement of the effective mosaicity can show both the anisotropic nature of the crystal (Fig. 11.5.7.7[link]) as well as the impact of radiation damage. The effective mosaicity is the convolution of the mosaic spread of the crystal, the beam divergence and the wavelength divergence of the incident X-ray beam. Hence, X-ray diffraction data collected at a synchrotron-radiation source necessitate the differentiation of the effective mosaicity in the horizontal and vertical planes. A more general approach is the introduction of six parameters reflecting the anisotropic effective mosaicity.

[Figure 11.5.7.7]

Figure 11.5.7.7| top | pdf |

Variation of (unconstrained) mosaicity for a monoclinic crystal of the bacterial virus alpha3 (Bernal et al., 1998[link]) showing the crystal anisotropy.








































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