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34 citations found for Nishikawa,

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The commercial imaging plate (IP) system, R-AXIS IV++ (RIGAKU Co., Japan) is an IP detector integrated with a read-out system. We evaluated it and made some improvements for R-AXIS IV++ to optimise it for the use of synchrotron X-ray solution scattering measurements. Rigorously controlling self-decay of stored images on the IP, a maximum 5% decrease in sensitivity was observed by changing the end time for IP erasure to the start time of exposure. By replacing standard IP material with another commercial material that gives a slower fading period, the decrease disappeared. It suggested that not only the self-decay of stored intensity, but also the relaxation of the IP was important in a quick measurement cycle (ca. 5 min). After these improvements were made, we compared its suitability for solution scattering with other detectors. We found scattering profiles amenable to quantitative analysis. However, in wide scattering regions with low signal strength, its dynamic range is still very sensitive to measuring conditions.

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Bhatia & Thornton [Phys. Rev. B. (1970), 2, 3004-3012] have derived the formula that relates the scattering intensity of a binary system to the Fourier transform of the local number density and concentration. For the intensity at the limit of zero scattering angle, the same formula can be derived by a much simpler process.

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Large crystals for neutron diffraction experiments were cooled anaerobically by two methods, cooling in a cold gas stream and plunge-cooling into liquid nitrogen, and their respective effects on crystal quality were compared. Gas-stream cooling was sufficient to suppress the increase in mosaicity over the entire crystal, leading to success in the first data collection for a membrane-bound hydrogenase from Desulfovibrio vulgaris in its active reduced form.

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A maltooligosaccharide-metabolizing enzyme from T. vulgaris R-47 (TGA) homologous to glucoamylase degrades maltooligosaccharides more efficiently than starch, unlike fungal glucoamylases. TGA was crystallized and the state of the protein in solution was analyzed by gel-filtration chromatography.

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In the energy-dispersive method, theoretical expressions for the inelastic scattering intensities to be compared with the experimental values are usually given without taking into account the width of the Compton spectrum. The validity of this approximation is examined for the X-ray scattering from neon. It is found that the error due to the neglect of the width never exceeds 0.2% of the total scattering intensity for scattering angles less than 35° and for photon energy ranging from 15 to 35 keV. The effect of the correction for the constant-angle measurements is also discussed.

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The present study analysed small-angle X-ray scattering profiles of myoglobin to examine how removal of the heme changes the intermolecular interaction.


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An attempt has been made to combine small-angle scattering of X-rays or neutrons with scanning electron microscopy in reciprocal space, in order to establish a structural analysis method covering a wide range of sizes from micro- to macro-scales.

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Crystallization of CcCel6C was carried out by the hanging-drop vapour-diffusion method. X-ray diffraction data were collected to 1.6 Å resolution from the crystal.


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Acta Cryst. (1987). A43, C50
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A novel apparatus has been developed that enables the simultaneous determination of the absorption factor during measurement of small-angle X-ray scattering intensities of a sample.

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The hydrogenase unit of the Hyd-2-type [NiFe]-hydrogenase from Citrobacter sp. S-77 was purified using an improved procedure and was then crystallized. Diffraction data sets from crystals of the samples with and without trypsin treatment were collected at resolutions of 1.60 and 2.00 Å, respectively.

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Crystal structures have been determined for two segments of the human F-spondin reeler domain at 1.45 and 2.70 Å resolution. The results provide insight into the structural plasticity of this domain.

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HA3, a 70 kDa haemagglutinating protein, is a precursor form of HA3a and HA3b, the subcomponents of Clostridium botulinum type C 16S progenitor toxin. In this report, recombinant HA3 protein was overexpressed in Escherichia coli, purified and crystallized.

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Acta Cryst. (2014). A70, C1778
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We report 3-dimensional structural analyses of huge spherulites of poly(oxyethylene) (PEG) by the X-ray computerized tomographic (CT) observation in blends of PEG and amorphous poly(lactide). The formation of the huge spherulites is characteristic of PEG and its direct observation by the X-ray CT is reported here for the first time. Slit-shaped cracks were clearly observed by the X-ray CT. Not only the straight cracks but also curved ones were found and it seemed that they overall formed a set of spokes. Furthermore, the scanning electron microscopic observation revealed that the cracks were parallel to bundles of lamellar crystallites. From those observations, we conclude that a set of radial cracks observed under the X-ray CT is a signature of a huge spherulite. Several aspects of an axialite structure are presented and a good agreement with the intuitively proposed structural model is obtained.

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The title compound, [Cu(dppaS2)(PPh3)2], is a neutral mononuclear copper(I) complex bearing an N,N-bis­(di­phenyl­phospho­rothio­yl)amidate (dppaS2) ligand and two tri­phenyl­phosphane ligands. The structure of this complex was obtained by X-ray diffraction and supported by DFT calculations.

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Acta Cryst. (2008). A64, C286-C287
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The title compound, C34H34O4, contains an intramolecular hydrogen bond involving the hydroxyl group. The crystal packing is stabilized by van der Waals interactions between the hydrophobic surfaces of the neighboring molecules. The observed structure demonstrates novel packing features.

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