Access the full text.
Sign up today, get DeepDyve free for 14 days.
A. Hountas, G. Tsoucaris (1995)
Twin variables and derminants in direct methodsActa Crystallographica Section A, 51
T. Debaerdemaeker, C. Tate, M. Woolfson (1988)
On the application of phase relationships to complex structures. XXVI. Developments of the Sayre‐equation tangent formulaActa Crystallographica Section A, 44
M. Woolfson, Jia‐xing Yao (1988)
On the application of phase relationships to complex structures. XXVII. Phase extension for small proteinsActa Crystallographica Section A, 44
D. Sayre (1974)
Least‐squares phase refinement. II. High‐resolution phasing of a small proteinActa Crystallographica Section A, 30
P. Roversi, J. Irwin, G. Bricogne (1998)
Accurate Charge-Density Studies as an Extension of Bayesian Crystal Structure DeterminationActa Crystallographica Section A, 54
K. Zhang, P. Main (1990)
Histogram matching as a new density modification technique for phase refinement and extension of protein moleculesActa Crystallographica Section A, 46
D. Collins (1982)
Electron density images from imperfect data by iterative entropy maximizationNature, 298
Phase extension from lower to higher resolution by using an upgraded TWIN variables algorithm [Hountas & Tsoucaris (1995). Acta Cryst. A51, 754–763] in protein molecules with close to 1000 non‐H atoms is presented. Three points of this procedure are of particular interest. (i) The use of a set of auxiliary variables providing a satisfactory fit for many kinds of constraints: the new algorithm works efficiently despite the extreme `dilution' of very limited initial phase information into a much larger set of auxiliary variables. (ii) The extension of this auxiliary variables set beyond the resolution of the observed data, which enhances the phase extension in a so‐called `super‐resolution' sphere. (iii) The use of the crystallographic symmetry as a new figure of merit and as a reliable test for the correctness of the phase‐extension process allows an efficient screening.
Acta Crystallographica Section A Foundations of Crystallography – Wiley
Published: Mar 1, 2000
Read and print from thousands of top scholarly journals.
Already have an account? Log in
Bookmark this article. You can see your Bookmarks on your DeepDyve Library.
To save an article, log in first, or sign up for a DeepDyve account if you don’t already have one.
Copy and paste the desired citation format or use the link below to download a file formatted for EndNote
Access the full text.
Sign up today, get DeepDyve free for 14 days.
All DeepDyve websites use cookies to improve your online experience. They were placed on your computer when you launched this website. You can change your cookie settings through your browser.