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Resolution extrapolation
Zhang, K. Y. J., Cowtan, K. D. and Main, P.  International Tables for Crystallography (2012). Vol. F, Section 15.1.4.4, pp. 395-396 [ doi:10.1107/97809553602060000847 ]
Resolution extrapolation 15.1.4.4. Resolution extrapolation The Fourier coefficients of the density-modified map include nonzero contributions for reflections that were not present in the original electron-density map. These values are commonly used to restore the values of reflections that were missing from the original data (including low-resolution reflections falling ...
     [more results from section 15.1.4 in volume F]

Reciprocal-space interpretation of density modification
Zhang, K. Y. J., Cowtan, K. D. and Main, P.  International Tables for Crystallography (2012). Vol. F, Section 15.1.3, pp. 393-394 [ doi:10.1107/97809553602060000847 ]
Reciprocal-space interpretation of density modification 15.1.3. Reciprocal-space interpretation of density modification Density modification, although mostly performed in real space for ease of application, can be understood in terms of reciprocal-space constraints on structure-factor amplitudes and phases. Main & Rossmann (1966) showed that the NCS-averaging operation in real ...

Atomization
Zhang, K. Y. J., Cowtan, K. D. and Main, P.  International Tables for Crystallography (2012). Vol. F, Section 15.1.2.6, pp. 392-393 [ doi:10.1107/97809553602060000847 ]
... Acad. Sci. USA, 74, 2835-2839. Lamzin, V. S. & Wilson, K. S. (1997). Automated refinement for protein crystallography. Methods Enzymol. ... unknown structures. Science, 259, 1430-1433. Perrakis, A., Sixma, T. K., Wilson, K. S. & Lamzin, V. S. (1997). wARP: improvement and ...
     [more results from section 15.1.2 in volume F]

Introduction
Zhang, K. Y. J., Cowtan, K. D. and Main, P.  International Tables for Crystallography (2012). Vol. F, Section 15.1.1, p. 385 [ doi:10.1107/97809553602060000847 ]
Introduction 15.1.1. Introduction Density modification is a technique for improving the quality of an approximate electron-density map based on some conserved features of the correct electron-density map. These conserved features are independent of the unknown fine detail of the structural conformation. They are often expressed as constraints on the ...

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