International Tables for Crystallography (2012). Vol. F. ch. 13.4, pp. 352-363
https://doi.org/10.1107/97809553602060000842 |
Chapter 13.4. Noncrystallographic symmetry averaging of electron density for molecular-replacement phase refinement and extension
Contents
- 13.4. Noncrystallographic symmetry averaging of electron density for molecular-replacement phase refinement and extension (pp. 352-363) | html | pdf | chapter contents |
- 13.4.1. Introduction (p. 352) | html | pdf |
- 13.4.2. Noncrystallographic symmetry (NCS) (pp. 352-354) | html | pdf |
- 13.4.3. Phase determination using NCS (p. 354) | html | pdf |
- 13.4.4. The p- and h-cells (pp. 354-355) | html | pdf |
- 13.4.5. Combining crystallographic and noncrystallographic symmetry (pp. 355-356) | html | pdf |
- 13.4.6. Determining the molecular envelope (pp. 356-357) | html | pdf |
- 13.4.7. Finding the averaged density (pp. 357-358) | html | pdf |
- 13.4.8. Interpolation (p. 358) | html | pdf |
- 13.4.9. Combining different crystal forms (p. 358) | html | pdf |
- 13.4.10. Phase extension and refinement of the NCS parameters (p. 359) | html | pdf |
- 13.4.11. Convergence (pp. 359-360) | html | pdf |
- 13.4.12. Ab initio phasing starts (p. 360) | html | pdf |
- 13.4.13. Recent salient examples in low-symmetry cases: multidomain averaging and systematic applications of multiple-crystal-form averaging (pp. 360-361) | html | pdf |
- 13.4.14. Programs (p. 361) | html | pdf |
- References | html | pdf |
- Figures
- Fig. 13.4.2.1. The two-dimensional periodic design shows crystallographic twofold axes perpendicular to the page and local noncrystallographic rotation axes in the plane of the paper (design by Audrey Rossmann) (p. 352) | html | pdf |
- Fig. 13.4.2.2. (a) NCS in a triclinic cell (p. 353) | html | pdf |
- Fig. 13.4.2.3. The position of the twofold rotation axis which relates the two piglets is completely arbitrary (p. 353) | html | pdf |
- Fig. 13.4.4.1. Stereographic projections showing alternative definitions of the `standard orientation' of an icosahedron in the h-cell (p. 355) | html | pdf |
- Fig. 13.4.6.1. The volume of the molecular mask expressed as a percentage of the volume of the p-cell asymmetric unit, as determined by the density cutoff in the h-cell (p. 357) | html | pdf |
- Fig. 13.4.8.1. Interpolation box for finding the approximate electron density at G(Δx, Δy, Δz), given the eight densities at the corners of the box (p. 358) | html | pdf |
- Fig. 13.4.11.1. Plot of a correlation coefficient as the phases were extended from 8 to 3 Å resolution in the structure determination of Mengo virus (p. 359) | html | pdf |
- Fig. 13.4.12.1. Structure amplitudes of the type II crystals of southern bean mosaic virus, averaged within shells of reciprocal space, shown in relation to the Fourier transform of a 284 Å diameter sphere (p. 360) | html | pdf |
- Tables