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Article: Solving crystal structures from two-wavelength X-ray powder diffraction data - Breaking the phase ambiguity in the noncentrosymmetric case
Title | Solving crystal structures from two-wavelength X-ray powder diffraction data - Breaking the phase ambiguity in the noncentrosymmetric case |
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Authors | |
Keywords | Accuracy Amplitude Modulation Article Crystal Structure Data Analysis Diffraction Fourier Analysis Simulation X Ray Powder Diffraction |
Issue Date | 2000 |
Publisher | Wiley-Blackwell Publishing, Inc.. The Journal's web site is located at http://www.wiley.com/bw/journal.asp?ref=0108-7673&site=1 |
Citation | Acta Crystallographica Section A: Foundations Of Crystallography, 2000, v. 56 n. 6, p. 592-595 How to Cite? |
Abstract | Direct methods of breaking phase ambiguities in protein crystallography have been introduced in powder diffraction analysis. This is aiming at ab initio solution of noncentrosymmetric structures using two-wavelength anomalous powder diffraction data. The known structure of the hydrogen bromide salt of leotidine (C14H20O2N2·HBr) in space group P212121 was used for simulating two-wavelength anomalous powder diffraction with the Br atom as anomalous scatterer. X-ray wavelengths are selected at λ1 = 0.920 and λ2 = 1.500 Å Unique reflections from the diffraction pattern of λ2 were able to locate the Br atom accurately. All overlapping diffraction peaks were uniformly partitioned to decompose into single reflections. Structure-factor amplitudes were then extracted. With these and the substructure of Br atoms, unique phases for centric reflections (hk0, h0l and 0kl) and phase doublets for noncentric reflections were obtained. The direct method was used to break the phase ambiguity leading to an interpretable electron-density map, from which five cycles of Fourier iteration yielded the complete structure. |
Persistent Identifier | http://hdl.handle.net/10722/91903 |
ISSN | 2014 Impact Factor: 2.325 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Gu, YX | en_HK |
dc.contributor.author | Liu, YD | en_HK |
dc.contributor.author | Hao, Q | en_HK |
dc.contributor.author | Fan, HF | en_HK |
dc.date.accessioned | 2010-09-17T10:30:03Z | - |
dc.date.available | 2010-09-17T10:30:03Z | - |
dc.date.issued | 2000 | en_HK |
dc.identifier.citation | Acta Crystallographica Section A: Foundations Of Crystallography, 2000, v. 56 n. 6, p. 592-595 | en_HK |
dc.identifier.issn | 0108-7673 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/91903 | - |
dc.description.abstract | Direct methods of breaking phase ambiguities in protein crystallography have been introduced in powder diffraction analysis. This is aiming at ab initio solution of noncentrosymmetric structures using two-wavelength anomalous powder diffraction data. The known structure of the hydrogen bromide salt of leotidine (C14H20O2N2·HBr) in space group P212121 was used for simulating two-wavelength anomalous powder diffraction with the Br atom as anomalous scatterer. X-ray wavelengths are selected at λ1 = 0.920 and λ2 = 1.500 Å Unique reflections from the diffraction pattern of λ2 were able to locate the Br atom accurately. All overlapping diffraction peaks were uniformly partitioned to decompose into single reflections. Structure-factor amplitudes were then extracted. With these and the substructure of Br atoms, unique phases for centric reflections (hk0, h0l and 0kl) and phase doublets for noncentric reflections were obtained. The direct method was used to break the phase ambiguity leading to an interpretable electron-density map, from which five cycles of Fourier iteration yielded the complete structure. | en_HK |
dc.language | eng | en_HK |
dc.publisher | Wiley-Blackwell Publishing, Inc.. The Journal's web site is located at http://www.wiley.com/bw/journal.asp?ref=0108-7673&site=1 | en_HK |
dc.relation.ispartof | Acta Crystallographica Section A: Foundations of Crystallography | en_HK |
dc.subject | Accuracy | en_HK |
dc.subject | Amplitude Modulation | en_HK |
dc.subject | Article | en_HK |
dc.subject | Crystal Structure | en_HK |
dc.subject | Data Analysis | en_HK |
dc.subject | Diffraction | en_HK |
dc.subject | Fourier Analysis | en_HK |
dc.subject | Simulation | en_HK |
dc.subject | X Ray Powder Diffraction | en_HK |
dc.title | Solving crystal structures from two-wavelength X-ray powder diffraction data - Breaking the phase ambiguity in the noncentrosymmetric case | en_HK |
dc.type | Article | en_HK |
dc.identifier.email | Hao, Q: qhao@hku.hk | en_HK |
dc.identifier.authority | Hao, Q=rp01332 | en_HK |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1107/S0108767300011417 | en_HK |
dc.identifier.scopus | eid_2-s2.0-0034495940 | en_HK |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-0034495940&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 56 | en_HK |
dc.identifier.issue | 6 | en_HK |
dc.identifier.spage | 592 | en_HK |
dc.identifier.epage | 595 | en_HK |
dc.identifier.isi | WOS:000090105400012 | - |
dc.publisher.place | United States | en_HK |
dc.identifier.scopusauthorid | Gu, YX=7403046284 | en_HK |
dc.identifier.scopusauthorid | Liu, YD=12803269300 | en_HK |
dc.identifier.scopusauthorid | Hao, Q=7102508868 | en_HK |
dc.identifier.scopusauthorid | Fan, HF=7402554116 | en_HK |
dc.identifier.issnl | 0108-7673 | - |