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DM/DMMULTI software for phase improvement by density modification
Cowtan, K. D., Zhang, K. Y. J. and Main, P.  International Tables for Crystallography (2012). Vol. F, ch. 15.3, pp. 407-412 [ doi:10.1107/97809553602060000849 ]
... s equation calculation adds another level of complexity, described in Zhang & Main (1990b). Skeletonization imposes the protein histogram and solvent ... from 6 to 1.5, according to the method described by Zhang & Main (1990a). The histogram variances should be consistent with ... Institutes of Health for grant support (GM55663). References Abrahams, J. P. (1997). Bias reduction in phase refinement by ...

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 ]
Atomization 15.1.2.6. Atomization The atomization method uses the fact that the structure underlying the map consists of discrete atoms. It attempts to interpret the map by automatically placing atoms and refining their positions. Agarwal & Isaacs (1977) proposed a method for the extension of phases to higher resolutions by interpreting an electron ...
     [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 ]
... macromolecular crystallography. Acta Cryst. D49, 186-192. Hoppe, W. & Gassmann, J. (1968). Phase correction, a new method to solve partially ...
     [more results from section 15.1.1 in volume F]

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