Phase determination via Sayre-type equations with anomalous-scattering data.
Acta Crystallogr A
; 57(Pt 3): 341-50, 2001 May.
Article
em En
| MEDLINE
| ID: mdl-11326119
ABSTRACT
The necessary background for the analysis of complex-valued electron-density maps is established. Various systems of structure-factor equations of convolutional type akin to Sayre's squaring method equations are tested for agreement on the real and imaginary parts of the electron density as well as approximations thereof. A system of convolutional structure-factor equations holding in a complex-valued electron density generated by two atom types is developed. The scope of application of these equations is determined and it is shown that the equations provide a method of extrapolating high-resolution phases from a low-resolution base phase set without introducing further model bias. Additional applications to phase refinement are explored.
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Base de dados:
MEDLINE
Assunto principal:
Muramidase
/
Cristalografia por Raios X
/
Modelos Teóricos
Idioma:
En
Ano de publicação:
2001
Tipo de documento:
Article