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Predecessor
Volume 42, Issue 6
Displaying 1-12 of 12 articles from this issue
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Toshiro NAGASE2000 Volume 42 Issue 6 Pages 469-473
Published: December 22, 2000
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSExternal form of polyhedral crystal provides information on the structural feature of the crystal. This article describes the relation between the external form and the structure of crystals.View full abstractDownload PDF (7454K) -
Takashi KUMASAKA2000 Volume 42 Issue 6 Pages 474-477
Published: December 22, 2000
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSCrystal structure determination of proteins is not so straight forward, since the direct method for small molecules would not be applied to them. To extract the phase information from experimental measurement, methodological and technical developments have been proposed and examined. The qualification of crystals is also extended by the recent development of related techniques such as molecular biology, computation and synchrotron radiation. We summarize here the recent trend of computer software for protein crystallography.View full abstractDownload PDF (2628K) -
Masayoshi NAKASAKO, Hiromi NOMURA, Haruo OGAWA, Chikashi TOYOSHIMA2000 Volume 42 Issue 6 Pages 478-485
Published: December 22, 2000
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSCalcium ATPase (Calcium pump) from sarcoplasmic reticulum is an integral membrane protein of Mr 110 K and a representative member of P-type ATPase involved in the active transports of ions with the energy from ATP hydrolysis. This ion pump regulates muscle relaxation by up-taking calcium ions from muscle cells into sarcoplasmic reticulum against the concentration gradient of the calcium. This ion pump has been successfully crystallized into ultra-thin plate crystals (<20 micron) by a dialysis method. Through the multiple-isomorphous replacement experiments at cryogenic temperature, the three-dimensional structure of this pump has been determined at a resolution of 2.6Å. The crystal structure is the first to reveal the structural architecture of P-type ATPase. Here, we describe the methods used for solving the phase problem in the crystal structure analysis for such ultra-thin plate crystal: combination of cryogenic X-ray diffraction experiments and cryogenic electron microscopy.View full abstractDownload PDF (9589K) -
Shinya HASHIMOTO2000 Volume 42 Issue 6 Pages 486-496
Published: December 22, 2000
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSLocal atomic arrangements in a short-range ordered (SRO) ternary alloy system are discussed from the theoretical viewpoint of microdomain structure. Initial idea of the structure originated in the microdomain model (in which a long-range ordered atomic arrangement is formed within a tiny region) to explain the origin of the fine distribution on diffuse intensity maxima appearing in the SRO Cu-Au alloys {Hashimoto: Acta Cryst. A30, 792-798, (1974) } . Application of the model to the ternary alloys concluded that a negative partial intensity of diffuse scattering, which arises from the pairwise correlation between two different kinds of atoms, is caused by a mixing occupation of the two relevant atomic species on the sublattice in the ordered lattice within microdomains. Partial diffuse intensity maxima, which can be obtained by the anomalous scattering method by use of synchrotron radiation, turned out clearly to show the structural properties of the ternary alloy.View full abstractDownload PDF (3697K) -
Riichirou NEGISHI, Tomoe FUKAMACHI, Takaaki KAWAMURA2000 Volume 42 Issue 6 Pages 497-503
Published: December 22, 2000
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSX-ray standing wave method is widely used for determination of atomic position of an adsorbate at surface, an impurity atom in a bulk or an atom at an interface. If the method is combined with X-ray resonant scattering, novel applications are expected as the resonant scattering occurs in a very narrow region of X-ray energy, and the scattering factor and its phase varies in the region. In addition, the improvement in accuracy of atomic positions is expected. The principle idea of X-ray standing wave with resonant scattering is described, together with the variations of X-ray wavef eld around resonant condition both in the Bragg and Laue cases. Change in the fluorescent X-ray emission from GaAs is described as an example to show the variation of the wavefeld.View full abstractDownload PDF (2362K) -
Yoshimitsu KAKUTA, Lars C. Pedersen, Masahiko Negishi2000 Volume 42 Issue 6 Pages 504-509
Published: December 22, 2000
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSThe crystal structures of the estrogen sulfotransferase and the sulfotransferase domain (NsT1) of human heparan sulfate NDST 1 (N-deacetylase/N-sulfotransferase) have been solved in the presence of 3'-phosphoadenosine 5'-phosphate (PAP) . These structures reveal structural similarity between sulfotransferase and nucleotide kinase.View full abstractDownload PDF (2995K) -
Teruaki MOTOOKA2000 Volume 42 Issue 6 Pages 510-515
Published: December 22, 2000
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSWe have investigated growth mechanisims and defect formation processes during crystallization from melted Si by using molecular dynamics simulations combined with the Tersoff potential. The melt growth in the [001] direction was rate-limited by a diffusion process of Si to be trapped at the kink sites associated with {111} facets formed at the solid/liquid Si interface, while in the [111] direction the interface was essentially flat and the rate-limiting step was double-layered two-dimensional nucleation on the (111) surface which was fol-lowed by double-step lateral epitaxial growth. Defect formation was found to be initiated by a 5-membered ring created at the interface that gave rise to an interstitial-type defect resembling the ‹110› split interstitial.View full abstractDownload PDF (5625K) -
Fujio Izumi, Takuji Ikeda2000 Volume 42 Issue 6 Pages 516-521
Published: December 22, 2000
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSA heavy-duty system of high performance, RIETAN-2000, has recently been developed for Rietveld refinement, Le Bail refinement, whole-pattern fitting based on a maximum-entropy method (MEM), and individual profile fitting. An original feature called partial profile relaxation is applicable to (nearly) isolated reflections with relatively large residuals, which leads to better fits in these reflections. The state-of-the-art technology of MEM-based wholepattern fitting allows us to represent positional disorder, chemical bonds, and anharmonic thermal motion more adequately than the conventional Rietveld method. Four examples of applying RIETAN-2000 to microporous materials are introduced to demonstrate its high ability to analyze structural details.View full abstractDownload PDF (3029K) -
[in Japanese]2000 Volume 42 Issue 6 Pages 522-524
Published: December 22, 2000
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSDownload PDF (3096K) -
Yuji OHASHI2000 Volume 42 Issue 6 Pages 525
Published: December 22, 2000
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSDownload PDF (2160K) -
[in Japanese]2000 Volume 42 Issue 6 Pages 526
Published: December 22, 2000
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSDownload PDF (164K) -
[in Japanese]2000 Volume 42 Issue 6 Pages 527-529
Published: December 22, 2000
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSDownload PDF (4627K)
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