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241 citations found for Ishikawa,

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Acta Cryst. (2008). A64, C449
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Acta Cryst. (1981). A37, C268
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A crystal of Ta2H with a single ordered domain has been prepared by the reaction of hydrogen gas with a tantalum single-crystal. Precession and Weissenberg photographs show the superlattice reflections which are indexed in terms of an orthorhombic unit cell with lattice parameters A = a[2(1 +cos [gamma])]1/ 2, B = c and C = a[2(1-cos [gamma])]1/2, where a(= b) = 3.359, c = 3.398 Å and [gamma] = 90.3° are the parameters of the host monoclinic tantalum lattice. Quantitative intensity measurements indicate that these reflections arise mostly from the systematic displacement of metal atoms caused by the ordered hydrogen arrangement. The amount of displacement has been determined as 0.086 Å, which is a little larger than a previous neutron diffraction result (0.057 Å) on Ta2D.

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The crystal structures of long-type and short-type endonucleases IV were determined. These structures revealed that an additional C-terminal loop in the long type was responsible for its higher DNA-binding affinity.


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Acta Cryst. (2005). A61, c135
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A new compact high-resolution monochromator design optimized for Bragg angles near 90° provides 0.52 meV resolution and 2 × 108 photons s-1 at 25.65 keV.

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Be refractive lenses reduce the divergence of an X-ray beam from >11 µrad to <3 µrad, with almost no losses (~90% transmission). Al lenses provide similar collimation but lower (~45%) transmission.

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A new compact high-resolution monochromator design optimized for Bragg angles near 90° provides 0.52 meV resolution and 2 × 108 photons s-1 at 25.65 keV.

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Based on the molecular architecture revealed by electron cryo-tomography, the mechanism of the bending motion of eukaryotic flagella/cilia is discussed.


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A high-resolution X-ray crystallographic study of the effects of solvent deuteration on the crystallization of proteinase K shows negligibly small degradations of the crystals owing to solvent deuteration and small structural differences between nondeuterated and deuterated crystals of proteinase K.

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Acta Cryst. (2008). A64, C298
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SPring-8 is constructing most of its beamlines by combination of standardized components according to the light-source characteristics. Specifications of components as well as a unified method of assembly and alignment are described.

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In the crystal structure of the title compound, 2C5H6N5+·C6Cl2O42-·2H2O, two adeninium cations, one chloranilate dianion and two water mol­ecules are held together by O-H...O, N-H...O, O-H...Cl and C-H...O hydrogen bonds, forming a centrosymmetric unit. The chloranilate dianion resides on an inversion centre. The anion and two cations are approximately coplanar, the dihedral angle between the planes of the adeninium cation and the chloranilate dianion being 3.25 (3)°. The crystal structure is stabilized by inter-unit N-H...N, N-H...O, N-H...Cl and O-H...N hydrogen bonds, forming a three-dimensional hydrogen-bonding network.

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The crystal structure of the title compound, C3H10N+·BF4-, has been redetermined at 100 K and shows the BF4- anion to be ordered at this temperature. Both the anion and the cation lie on a mirror plane and they are connected by N-H...F and C-H...F hydrogen bonds.

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In the crystal structure of the title 1:2 salt, C10H22N22+·2C6HCl2O4-, the 4,4'-bipiperidinium dication and the two hydrogen chloranilate anions are held together by N-H...O and C-H...O hydrogen bonds. Two 1:2 units are connected by O-H...O hydrogen bonds, forming a centrosymmetric mol­ecular ring. The rings are further linked by O-H...O, N-H...O and C-H...O hydrogen bonds, leading to a three-dimensional hydrogen-bonding network.

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The crystal structure of the title compound, C3H10N+·ClO4, redetermined at 97 K, is isostructural with C3H10N+·BF4 [Gotoh, Ishikawa & Ishida (2005). Acta Cryst. E61, o4016–o4017]. Both the cation and the anion lie on a mirror plane and are connected by N—H...O and C—H...O hydrogen bonds.

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