Difference between revisions of "Optical resolution"
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| + | <font color="blue">Pouvoir de résolution</font> (''Fr''); <font color="red">Bildauflösung</font> (''Ｇｅ''); <font color="green">Resolución de imagen</font> (''Ｓｐ''); <font color="black">Risoluzione angolare</font> (''It''); <font color="purple">分解能</font> (''Ja''). | ||
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By analogy with optical observations, ''e.g.'' in astronomy, the term [[optical resolution]] in [[structure determination]], <math>d_\mathrm{opt}</math>, is used to describe the expected minimum distance between two resolved peaks in an electron-density map. | By analogy with optical observations, ''e.g.'' in astronomy, the term [[optical resolution]] in [[structure determination]], <math>d_\mathrm{opt}</math>, is used to describe the expected minimum distance between two resolved peaks in an electron-density map. | ||
Revision as of 11:33, 14 April 2016
Pouvoir de résolution (Fr); Bildauflösung (Ｇｅ); Resolución de imagen (Ｓｐ); Risoluzione angolare (It); 分解能 (Ja).
By analogy with optical observations, e.g. in astronomy, the term optical resolution in structure determination, [math]d_\mathrm{opt}[/math], is used to describe the expected minimum distance between two resolved peaks in an electron-density map.
[math]d_\mathrm{opt} = [2(\sigma_\mathrm{Patt}^2 + \sigma_\mathrm{sph}^2)]^{1/2}[/math]
where [math]\sigma_\mathrm{Patt}[/math] is the standard deviation of the Gaussian function fitted to the Patterson origin peak, [math]\sigma_\mathrm{sph}[/math] is the standard deviation of the Gaussian function fitted to the origin peak of the spherical interference function, representing the Fourier transform of a sphere with radius [math]1/d_\mathrm{min}[/math], and [math]d_\mathrm{min}[/math] is the nominal resolution.
History
The term was introduced into the protein structure determination literature by Vaguine, A. A., Richelle, J. & Wodak, S. J. [(1999). Acta Cryst. D55, 191-205. SFCHECK: a unified set of procedures for evaluating the quality of macromolecular structure-factor data and their agreement with the atomic model].