OASIS

Entered: Wed Nov 24 2010

Operating systems: MacOS; Unix; VMS; MS Windows

Type: Source

Languages: Fortran

Distribution: Free

Application fields: Biology; Structure determination

Bibliography: Hao, Q., Gu, Y. X., Zheng, C. D. & Fan, H. F. (2000). J. Appl. Cryst. 33, 980-981.

Description: Breaks the phase ambiguity in one-wavelength anomalous scattering (OAS) or single isomorphous replacement (SIR) (substitution) protein data. The phase problem is reduced to a sign problem once the anomalous-scatterer or the replacing-heavy-atom sites are located. Applies a direct method procedure to break the phase ambiguity intrinsic to OAS or SIR data.

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