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801 citations found for Tanaka,

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In order to improve significantly data collection efficiency, the advantages of using multi-wavelengths in single-crystal neutron diffraction as well as in powder neutron diffraction were established by experiments using a stacked monochromator assembly of two elastically bent perfect Si(111) and Si(220) crystals.


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The title compound, [Co(C14H18N2O6)], is the first structurally characterized example of a [beta]-ketoiminato CoII complex without axial ligands. It adopts a square-planar cis-[CoN2O2] coordination geometry, and lies on a mirror plane. The planar complexes are stacked along 21 screw axes parallel to b to form columns, the Co...Co distance in the column being 3.5213 (2) Å.

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A low-energy positron beam is a unique probe of Fermi surfaces, defects, surfaces and interfaces. In high-energy electron and positron storage rings (E > 6 GeV) it is possible to generate intense synchrotron radiation with 1-3 MeV photons by installing a high-field superconducting wiggler. The strength of the wiggler should be ~8-12 T. High-energy photons are emitted from the wiggler and converted to low-energy positrons by using a suitable target-moderator system. For an 8 GeV electron storage ring at a beam current of 100 mA, final yields are estimated to be ~1010-1012 (slow-e+ s-1) with the size of positron source ~102-103 cm2. The possibility of increasing the brightness of the low-energy positron beam is discussed. Advantages of using synchrotron radiation for producing positrons are pointed out. The effect of a superconducting wiggler on the stored electron beam is also discussed.

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A low-energy positron beam is a unique probe of materials. In high-energy electron and positron storage rings it is possible to generate intense synchrotron radiation with a photon energy of 1-3 MeV by installing a high-field (8-10 T) superconducting wiggler. High-energy photons are converted to low-energy positrons by using a suitable target-moderator system. For an 8 GeV electron storage ring at a beam current of 100 mA, final yields are estimated to be about 108-1010 slow-e+ s-1 or larger depending on the moderation efficiency, with the size of the positron source 101-102 cm2. In the present work a wiggler magnetic system of 10 T is proposed. The main parameters of the superconducting wiggler are presented.

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Acta Cryst. (2002). A58, c52
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Pig heart carbonyl reductase has been crystallized in the presence of NADPH. Diffraction data have been collected using synchrotron radiation.


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Phosphoglucose isomerase from P. falciparum has been crystallized. Diffraction data to 1.8 Å resolution have been collected using synchrotron radiation.

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Acta Cryst. (1984). A40, C47
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To characterize the defect sites in the near-surface and bulk phase of Li-MgO and Li-La2O3-MgO, XANES at Mg K-edge and La L3-edge was applied. For Li-MgO, it can be suggested that Li doping at a low content (2.5 wt%) brings about the formation of defect species only in the near-surface. This is due to the localization of doped Li ions in the surface, and thus the catalytically active species containing [Li+-O-] type center exist in the surface region. After OCM reaction, the defect species are formed in the near-surface over MgO and Li-MgO. By addition of La2O3 to Li-MgO (La/(Mg+La)=0.25), the structural change during the reaction is almost suppressed in the surface. In addition, the Li-La2O3-MgO shows higher C2 selectivity than Li-MgO.

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Crystals of a geranyl pyrophosphate methyltransferase in the biosynthetic pathway of the off-flavor terpenoid alcohol, 2-methylisoborneol were obtained in the absence and presence of cofactor, cofactor analog and substrate.

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The hexameric crystal structure of geranyl pyrophosphate methyltransferase in complex with bona fide substrate provides the first model of enzymatic C-methylation of an isoprenoid pyrophosphate.


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