Journal of Synchrotron Radiation

 

J. Synchrotron Rad. (2005). 12, 391  [ doi:10.1107/S0909049505017243 ]

The uses of softer X-rays in structural studies

R. J. Cernik, J. R. Helliwell and M. Helliwell

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 392-401  [ doi:10.1107/S0909049505010150 ]

Using softer X-ray absorption spectroscopy to probe biological systems

B. Akabayov, C. J. Doonan, I. J. Pickering, G. N. George and I. Sagi

Synopsis: The application of softer X-ray absorption spectroscopy (XAS) to biological systems is discussed. In addition, the issues of sample preparation, available beamlines, detection devices and other difficulties associated with conducting softer XAS experiments on dilute biological samples are discussed.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 402-409  [ doi:10.1107/S0909049505009222 ]

X-ray spectroscopy and X-ray diffraction at wavelengths near the K-absorption edge of phosphorus

V. Biou, P. Bösecke, J.-M. Bois, G. Brandolin, R. Kahn, C. Mas, L. Nauton, H. Nury, E. Pebay-Peyroula, J. Vicat and H. Stuhrmann

Synopsis: With purple membrane the resonant atomic form factors f' and f'' of phosphorus vary by nearly 20 electron units at wavelengths near its K-absorption edge at  = 5.77 Å. Test experiments on a single crystal of ADP/ATP carrier protein using the same wavelength gave a first low-resolution diffraction pattern.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 410-419  [ doi:10.1107/S0909049504025762 ]

Softer and soft X-rays in macromolecular crystallography

K. Djinovic Carugo, J. R. Helliwell, H. Stuhrmann and M. S. Weiss

Synopsis: The utilization and the potential of softer and soft X-rays in macromolecular crystallography as well as the challenges associated with the corresponding diffraction experiments and their possible remedies are reviewed.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 420-430  [ doi:10.1107/S0909049504032327 ]

The use of softer X-rays in the structure elucidation of microporous materials

M. Helliwell, R. H. Jones, V. Kaucic and N. Z. Logar

Synopsis: The research effort on novel open-pore chemical structures requires site-specific position and occupancy determination of metal atoms. These involve K edges in the softer X-ray range, from 1.5 to 2.5 Å, leading to novel challenges in synchrotron radiation instrumentation and anomalous dispersion methods in single crystal and powder diffraction. For the latter, separating out of the powder pattern peaks, using softer X-rays, opens up application to ab initio structure solution of more complicated and larger structures.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 431-433  [ doi:10.1107/S0909049505015414 ]

Application notes on the use of softer X-rays for anomalous powder diffraction

R. J. Cernik, S. Husheer, A. D. Smith and M. Roper

Synopsis: The practical aspects of studying powder samples with softer X-rays for indexing or structure solution applications are discussed.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 434-441  [ doi:10.1107/S0909049505009167 ]

Resonant soft X-ray diffraction - in extremis

P. D. Hatton, S. B. Wilkins, T. A. W. Beale, T. K. Johal, D. Prabhakaran and A. T. Boothroyd

Synopsis: Recent advances in the new technique of soft X-ray single-crystal diffraction are described.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 442-447  [ doi:10.1107/S0909049505013610 ]

Pure-type superconducting permanent-magnet undulator

T. Tanaka, R. Tsuru and H. Kitamura

Synopsis: A novel synchrotron radiation source is proposed that utilizes bulk-type high-temperature superconductors as permanent magnets.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 448-454  [ doi:10.1107/S0909049505007843 ]

A new X-ray spectrometer with large focusing crystal analyzer

E. Welter, P. Machek, G. Dräger, U. Brüggmann and M. Fröba

Synopsis: A new Johann spectrometer for high-resolution spectroscopy, which is installed at the wiggler beamline W1 at HASYLAB/DESY, is described. Performance tests and two benchmark experiments (RIXS, XAFS) are presented.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 455-466  [ doi:10.1107/S0909049505009131 ]

A high-throughput structural biology/proteomics beamline at the SRS on a new multipole wiggler

M. Cianci, S. Antonyuk, N. Bliss, M. W. Bailey, S. G. Buffey, K. C. Cheung, J. A. Clarke, G. E. Derbyshire, M. J. Ellis, M. J. Enderby, A. F. Grant, M. P. Holbourn, D. Laundy, C. Nave, R. Ryder, P. Stephenson, J. R. Helliwell and S. S. Hasnain

Synopsis: A new MAD beamline at the SRS (UK) for structural genomics and proteomics has been recently commissioned. The beamline is based on a 20 mm external gap, 2.46 T ten-pole wiggler with highly optimized optics to provide rapid (subsecond) tunability over an edge and the highest intensity radiation over 5 to 13.5 keV. An energy-dispersive high-count-rate fluorescence detector with large active area is also integrated into the crystallographic set-up providing unique capabilities to this MAD station.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 467-472  [ doi:10.1107/S0909049505010630 ]

Improving the performance of high-resolution X-ray spectrometers with position-sensitive pixel detectors

S. Huotari, Gy. Vankó, F. Albergamo, C. Ponchut, H. Graafsma, C. Henriquet, R. Verbeni and G. Monaco

Synopsis: The cube-size contribution to the resolution function of a diced analyzer crystal has been eliminated by the use of a position-sensitive detector. A resolution of 23 meV at a photon energy of 9.9 keV was achieved with a spectrometer based on a 1 m Rowland circle and a diced Si(555) analyzer crystal at a Bragg angle of 88.5°.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 473-478  [ doi:10.1107/S090904950501472X ]

Spherically bent analyzers for resonant inelastic X-ray scattering with intrinsic resolution below 200 meV

E. Collart, A. Shukla, F. Gélébart, M. Morand, C. Malgrange, N. Bardou, A. Madouri and J.-L. Pelouard

Synopsis: The successful fabrication of spherically bent Si analyzer crystals for high-resolution inelastic scattering experiments at transition metal K-edges is reported.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 479-483  [ doi:10.1107/S090904950501352X ]

X-ray microdiffraction and conventional diffraction from frozen-hydrated biological specimens

H. Iwamoto, K. Inoue, T. Fujisawa and N. Yagi

Synopsis: A system for recording micro- and conventional X-ray diffraction patterns from quick-frozen hydrated biological specimens is described. By using this system, diffraction patterns have been obtained from a single sarcomere (volume 10 µm³) of an insect flight muscle myofibril.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 484-487  [ doi:10.1107/S090904950501215X ]

X-ray diffraction method for the investigation of contacts between solid surfaces

H. Keymeulen, T. Lackner, A. Diaz, B. Patterson and F. van der Veen

Synopsis: X-ray diffraction effects from crossed cylindrical surfaces are described. The method is useful for studying contacts between surfaces, liquid confinement and coherence of X-ray beams.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 488-493  [ doi:10.1107/S0909049505014561 ]

On the refinement of time-resolved diffraction data: comparison of the random-distribution and cluster-formation models and analysis of the light-induced increase in the atomic displacement parameters

I. I. Vorontsov and P. Coppens

Synopsis: The random-distribution and cluster-formation models for light-induced changes in crystals lead to very different intensity changes and can be distinguished by analysis of the diffraction response to illumination. The effect of light-induced changes on the atomic displacement parameters is analyzed.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 494-498  [ doi:10.1107/S0909049505011003 ]

Lowest limit for detection of impurity concentration in semiconductors by fluorescence XAFS: resonant Raman scattering and angle dependence

Y. Takeda, H. Ofuchi, H. Kyouzu, R. Takahashi and M. Tabuchi

Synopsis: The lowest limit for detection of the impurity concentration doped in semiconductors in the case of fluorescence XAFS measurements has been investigated as a function of the matrix of the impurity and the geometry of the measurement.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 499-505  [ doi:10.1107/S090904950501143X ]

A new cell for the study of in situ chemical reactions using X-ray absorption spectroscopy

A. Longo, A. Balerna, F. d'Acapito, F. D'Anca, F. Giannici, L. F. Liotta, G. Pantaleo and A. Martorana

Synopsis: A new in situ cell for XAFS measurement in transmission and fluorescence mode is described. As a test case, the oxidation of CO promoted by the Pt/ceria-zirconia catalyst is reported.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 506-510  [ doi:10.1107/S0909049504034193 ]

A method for normalization of X-ray absorption spectra

T.-C. Weng, G. S. Waldo and J. E. Penner-Hahn

Synopsis: An improved normalization algorithm for X-ray absorption spectra is described.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 511-516  [ doi:10.1107/S0909049505013579 ]

X-ray fluorescence methods for investigations of lipid/protein membrane models

N. N. Novikova, E. A. Yurieva, S. I. Zheludeva, M. V. Kovalchuk, N. D. Stepina, A. L. Tolstikhina, R. V. Gaynutdinov, D. V. Urusova, T. A. Matkovskaya, A. M. Rubtsov, O. D. Lopina, A. I. Erko and O. V. Konovalov

Synopsis: The molecular mechanisms of the protective effect of bisphosphonate drug have been studied by the total reflection X-ray fluorescence method. A molecular film of the membrane enzyme Ca-ATPase deposited on a silicon substrate was used as a model system.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 517-523  [ doi:10.1107/S0909049505006953 ]

VUV irradiation effects on proteins in high-flux synchrotron radiation circular dichroism spectroscopy

F. Wien, A. J. Miles, J. G. Lees, S. Vrønning Hoffmann and B. A. Wallace

Synopsis: The effects of very intense synchrotron radiation vacuum ultraviolet light on the circular dichroism spectra and chemical integrity of proteins are discussed. Experiments have been chosen to distinguish between possible degradation and denaturation effects; local heating of the sample resulting in denaturation appears to be the primary factor producing the observed spectral changes.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 524-529  [ doi:10.1107/S0909049505007703 ]

Overcoming protein denaturation caused by irradiation in a high-flux synchrotron radiation circular dichroism beamline

R. W. Janes and A. L. Cuff

Synopsis: Methods are described by which the deterioration of the synchrotron radiation circular dichroism signal of proteins in high-flux beamlines can be minimized.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 530-533  [ doi:10.1107/S0909049505006497 ]

Atomic imaging in EBCO superconductor films by an X-ray holography system using a toroidally bent graphite analyzer

T. Sekioka, K. Hayashi, E. Matsubara, Y. Takahashi, T. Hayashi, M. Terasawa, T. Mitamura, A. Iwase and O. Michikami

Synopsis: Radiation damage in high-T_c superconductor materials irradiated by high-energy heavy ions has been studied by X-ray fluorescence holography with synchrotron radiation.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 534-536  [ doi:10.1107/S0909049505008356 ]

High-energy phase-contrast X-ray imaging using a two-crystal X-ray interferometer

A. Yoneyama, T. Takeda, Y. Tsuchiya, J. Wu, T.-T. Lwin, K. Hyodo and Y. Hirai

Synopsis: The capabilities of a large-area imaging system based on a two-crystal X-ray interferometer have been extended by raising the X-ray energy from 17.7 keV to 35 keV. An interference pattern and example of a high-quality three-dimensional image are given.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 537-541  [ doi:10.1107/S0909049505012719 ]

ATHENA, ARTEMIS, HEPHAESTUS: data analysis for X-ray absorption spectroscopy using IFEFFIT

B. Ravel and M. Newville

Synopsis: A description of a package of graphical data-analysis tools for X-ray absorption spectroscopy is given.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 542  [ doi:10.1107/S0909049505017814 ]

Variable-period undulators as synchrotron radiation sources. Erratum

G. K. Shenoy, J. W. Lewellen, D. Shu and N. A. Vinokurov

Synopsis: Erratum to J. Synchrotron Rad. (2003). 10, 205-213.

Online 15 June 2005

 

J. Synchrotron Rad. (2005). 12, 543-544  [ doi:10.1107/S0909049505018741 ]

Current events

Online 15 June 2005