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57 citations found for Sugawara,

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A free-electron laser (FEL) based on the proposed Tohoku Light Source storage ring is discussed. In the first stage the FEL is made to operate in the visible region with a relative low beam energy to avoid the complication of mirrors. Then, with a higher beam energy, the FEL can produce radiation of wavelengths in the UV or VUV region. Some simulation results of the storage-ring FEL with wavelengths of ~200 nm are presented.

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A fucose-specific lectin from A. aurantia was crystallized. 2.2 Å resolution data sets were collected and phased by the MAD method using an Hg derivative.

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Acta Cryst. (2014). A70, C1299
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A century ago, crystallogtaphy ushered in the era of modern science & technology in Japan. The beginning of modern crystallography in Japan dates back to 1913. Torahiko Terada (Tokyo Imperial University) demonstrated X-ray diffraction[1] and Shoji Nishikawa (Tokyo Imperial University) reported on X-ray patterns of fibrous, lamellar and granular substances[2]. In 1936, Ukichiro Nakaya (Hokkaido University) successfully classified natural snow crystals and made the first artificial snow crystals. In the last half-century, developments in crystallography helped form thriving manufacturing sectors such as the semiconductor industry, the iron and steel industries, the pharmaceutical industry, the electronics industry, the textile industry, and the polymer industry, as well as a wide array of academic research.


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An invertebrate C-type lectin, CEL-I, from the marine invertebrate C. echinata was crystallized and 2.0 Å resolution data were collected using synchrotron radiation.

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Plastocyanin from Synechococcus sp. PCC7942 has been crystallized in two forms. Data have been obtained using Cu K[alpha] and synchrotron radiation and molecular-replacement calculations performed.

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Acta Cryst. (2014). A70, C1304
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"We can find many seeds of crystallography in Japanese culture. Most of the family crests have symmetry elements such as rotation axes and mirror symmetry elements. Sekka-zue, a picture book of 86 kinds of crystals of snow, was made by Toshitura Doi, who is a feudal lord in Edo-period and he observed snow using a microscope in nineteenth century. In recent years, people enjoy to make crystal structures, polyhedrons, carbon nanotube, quasicrystal etc. by origami, the art of folding paper [1]. In the field of science, the Japanese crystallography has contributed to explore culture and art. An excellent example is unveiling the original color of Japanese painting "Red and White Plum Blossoms" by Korin Ogata [2]. Prof. Izumi Nakai (Tokyo University of Science) developed an X-ray fluorescence analyzer and an X-ray powder diffractometer designated to the investigation of cultural and art works and had succeeded in reproducing the silver-colored waves through computer graphics after X-ray analyses of crystals on the painting. The scientific approach by Prof. Nakai et al. unveiled the mystery of cultural heritage of ancient near east, ancient Egypt etc. and is being to contribute to insight into the history of human culture. [1] An event to enjoy making crystals by origami is under contemplation. [2] The symposium ""Crystallography which revives heritages"" was held on February 16, 2014 at Atami in Japan."

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Acta Cryst. (2017). A73, C88
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A vertically dispersive X-ray absorption fine-structure measurement system was constructed for the sequential measurement of space-resolved XAFS data. The time and spatial resolutions of the instrument were estimated as 1 s and 100 µm. The system was used to analyze the reaction distribution and its spatial propagation for the LiFePO4 lithium ion battery during the charging process after the potential jump.

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The construction of a third-generation light source has been proposed at Tohoku University. The emittance is 7.3 nm rad at the nominal beam energy, 1.5 GeV. The circumference is 194 m. The ring consists of 12 double-bend achromatic cells. Ten of 12 dispersion-free long straight sections are 5 m long and will be used for insertion devices and some accelerator components. The remaining two are each 15 m long and reserved for advanced devices, such as a very long undulator or a free-electron laser. A stretcher-booster ring, which is now under commission, will be used as an injector. In total, about 50 beamlines can be constructed and ten of them will be those of insertion devices. The present status of the project is `waiting for approval'.

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Acta Cryst. (2008). A64, C399
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Crystals of L-leucylglycine (L-Leu–Gly) 0.67-hydrate, C8H16N2O3·0.67H2O, (I), were obtained from an aqueous solution. There are three symmetrically independent dipeptide zwitterionic mol­ecules in (I) and they are parallel to one another. The hydrogen-bond network composed of carboxyl­ate and amino groups and water mol­ecules extends parallel to the ab plane. Hydro­philic regions composed of main chains and hydro­phobic regions composed of the isobutyl groups of the leucyl residues are aligned alternately along the c axis. An imidazolidinone derivative was obtained from L-Leu–Gly and acetone, viz. [(4S)-2,2-dimethyl-4-(2-methyl­prop­yl)-5-oxo­imid­azolidin-3-ium-1-yl]acetate, C11H20N2O3, (II), and was crystallized from a methanol–acetone solution of L-Leu–Gly. The unit-cell parameters coincide with those reported previously for L-Leu–Gly dihydrate revealing that the previously reported values should be assigned to the structure of (II). One of the imidazolidine N atoms is protonated and the ring is nearly planar, except for the protonated N atom. Protonated N atoms and deprotonated carb­oxy groups of neighbouring mol­ecules form hydrogen-bonded chains. The ring carbonyl group is not involved in hydrogen bonding.

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Acta Cryst. (2011). A67, C272-C273
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Acta Cryst. (2014). A70, C1309
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Divers Japanese Science and Technology has advanced together with the progress of crystallography in biology, chemistry, physics, materials science, metallurgy, electronics, engineering, geoscience, etc. Based on the highly scientific and crystallographic technology, Japan has been a great contributor in developing of high-end X-ray generator, electron microscope as well as large scale Photon Science facilities, such as Photon Factory (SR), SPring-8 (SR), J-PARC (Neutron) and SACLA (XFEL). Under such background, we promote IYCr2014 with the partnership of 36 academic societies in the field of pure and applied sciences. In the last half-century, developments in crystallography have also helped thriving manufacturing sectors such as the semiconductor, the iron and steel, the pharmaceuticals, the electronics, the textile, and the chemical industries. Some of the recent impressive outcomes in Japan are fundamental findings of photosynthesis [1] and pristine asteroid [2]. Crystallography in Japan keeps promoting our nationwide projects grappling with global problems such as environment and food, and will contribute to realize a sustainable society.

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Acta Cryst. (2011). A67, C240
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