Figure 2.3.3.4

Rossmann, M. G.; Arnold, E.

doi:10.1107/97809553602060000556

International
Tables for
Crystallography
Volume B
Reciprocal space
Edited by U. Shmueli

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International Tables for Crystallography (2006). Vol. B. ch. 2.3, p. 244 | 1 | 2 |

Figure 2.3.3.4

M. G. Rossmann^a ^* and E. Arnold^b

^aDepartment of Biological Sciences, Purdue University, West Lafayette, Indiana 47907, USA, and ^bCABM & Rutgers University, 679 Hoes Lane, Piscataway, New Jersey 08854-5638, USA
Correspondence e-mail: mgr@indiana.bio.purdue.edu

Figure 2.3.3.4

The phase α of the native compound (structure factor $[{\bf F}_{N}]$ ) is determined either as being equal to, or 180° out of phase with, the presumed heavy-atom contribution when only a single isomorphous compound is available. In (a) is shown the case when $[|{\bf F}_{N}| \gt |{\bf F}_{NH}|]$ and $[\alpha \simeq \varphi + \pi]$ . In (b) is shown the case when $[|{\bf F}_{N}| \lt |{\bf F}_{NH}|]$ and $[\alpha = \varphi]$ , where φ is the phase of the heavy-atom structure factor $[{\bf F}_{H}]$ .