Phasing via pure crystallographic least squares: an unexpected feature.
Acta Crystallogr A Found Adv
; 74(Pt 2): 123-130, 2018 Mar 01.
Article
in En
| MEDLINE
| ID: mdl-29493541
ABSTRACT
Crystallographic least-squares techniques, the main tool for crystal structure refinement of small and medium-size molecules, are for the first time used for ab initio phasing. It is shown that the chief obstacle to such use, the least-squares severe convergence limits, may be overcome by a multi-solution procedure able to progressively recognize and discard model atoms in false positions and to include in the current model new atoms sufficiently close to correct positions. The applications show that the least-squares procedure is able to solve many small structures without the use of important ancillary tools e.g. no electron-density map is calculated as a support for the least-squares procedure.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Acta Crystallogr A Found Adv
Year:
2018
Document type:
Article
Affiliation country:
Italy