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55 citations found for Matsuda,

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A methodology based on wavelet transformation and digital interferometry is proposed to obtain the most essential information from X-ray Gabor holograms.

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Crystals of the multicopper oxidase CueO obtained from a perdeuterated sample for neutron diffraction diffracted to 1.8 Å resolution using X-rays and their crystal structure was solved.

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The crystal of the DNA dodecamer of d(CGCGmo6AATCCGCG) containing 2'-deoxy-N6-methoxyadenosine changes from one form to another during data collection, as a phase transition ascribed to differences in humidity. It has been found as the first example that the N6-methoxyadenosine residue forms a base pair with cytosine residue in a manner identical to Watson-Crick-type pairing.

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Acta Cryst. (2014). A70, C1605
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This study reports determination of the atomic coordinates of a two-dimensional atomic sheet, silicene, by using total reflection high-energy positron diffraction (TRHEPD) [1]. TRHEPD method, formerly called as RHEPD, is a surface-sensitive tool owing to the total reflection of positrons. Since the sign of the potential energy for positrons in crystals is positive, opposite to that for the electrons, the positron beam at a grazing incidence are totally reflected at a crystal surface. The penetration depth of the positron beam in the total reflection region is estimated to be approximately a few Å, which corresponds to the thickness of 1-2 atomic layers. Thus, the positron beam selectively sees the topmost surface layer and hence the TRHEPD method is very useful for structure determinations of crystal surface and two-dimensional atomic sheet on the substrate. Silicene is a two-dimensional atomic sheet of silicon. Since the silicene has an intriguing property such as a Dirac cone like a graphene, it attracts increasing attention as a candidate for future devices. Recently, the synthesis of silicene on a Ag(111) surface was successfully performed [2]. Although the atomic coordinates of the silicene in this system was theoretically calculated, they were not confirmed experimentally. It is very important to experimentally determine the magnitude of the buckling in silicene and the spacing between the bottom of the silicene and the substrate because the dispersion of the Dirac cone is closely related to these structure parameters. We thus investigated the atomic positions of the silicene on the Ag(111) surface using the TRHEPD [3]. From the rocking curve analysis based on the dynamical diffraction theory of positrons (see figure), the existence of the buckling (0.83 Å) in silicene was verified experimentally. Moreover, the spacing between the silicene and the substrate was determined as 2.17 Å. The structural difference with the graphene will be also discussed.

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J. Appl. Cryst. (2007). 40, s544-s548
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A preliminary result of reverse Monte Carlo analysis of small-angle X-ray scattering data for expanded fluid Hg with the help of wide-angle X-ray diffraction data in the same thermodynamic state is presented. To see the large density fluctuation associated with liquid-vapor critical phenomena, a three-dimensional configuration of 100000 Hg atoms is modeled.

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Attempts to produce high-quality protein from the MTB genome using the established pET expression system in E. coli are shown. The difficulties encountered at each stage are assessed and the need for alternative purification methodologies are suggested.

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The crystal structure of the mouse UNC5H2 death domain at 2.1 Å resolution is reported. The UNC5H2 death domain is a dimer in the crystal and in solution.


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The crystal structure of bovine H-protein, which is involved in glycine cleavage, was determined at 0.88 Å resolution. This is the first high-resolution structure of an H-protein.



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J. Appl. Cryst. (2007). 40, s537-s539
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Small-angle X-ray scattering measurements for expanded fluid Se were carried out up to the semiconductor-metal transition region. A broad peak in the small-angle X-ray scattering profiles appears, suggesting a correlation length of 50 Å.



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Acta Cryst. (2005). A61, c485
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The acetate-bound form of copper was found in the crystal structure of the multicopper oxidase CueO. The exogenous acetate ion can reach the copper active site through the water channel in the CueO molecule.



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Described here is the implementation of the high-resolution neutron Larmor diffraction technique using superconducting magnetic Wollaston prisms at the High-Flux Isotope Reactor of Oak Ridge National Laboratory (ORNL), Tennesse, USA. Recent results are discussed.

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An energy resolution of <10 µeV for the measurement of phonon energy change is achieved with the inelastic neutron spin echo technique on a conventional neutron triple-axis spectrometer.

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