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14 citations found for Osaka,

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A new optical technique used to extract a specific harmonic of undulator radiation is proposed and the concept was experimentally confirmed using X-ray pulses from SACLA.

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A new scheme is proposed and demonstrated to generate a two-color X-ray free-electron laser consisting of broadband and narrowband beams.

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A new method using intensity correlation of X-ray fluorescence is proposed and demonstrated for temporal diagnostics of femtosecond and attosecond X-ray free-electron laser pulses.

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Focusing of an X-ray free-electron laser enables the production of ultrahigh-intensity X-ray pulses. X-ray nanobeams of a free-electron laser were generated using reflective focusing optics combined with speckle interferometry.

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A double channel-cut crystal monochromator and compound refractive lenses were implemented for advanced pump–probe X-ray experiments at SACLA BL3.

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Acta Cryst. (2011). A67, C240
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A focus characterization method using the intensity correlation of X-ray fluorescence is proposed, and demonstrated for the sub-micrometre focused X-ray free-electron laser beam at the SPring-8 Angstrom Compact Free Electron Laser.

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A channel-cut Si(111) crystal X-ray monochromator with a channel width of 90 µm was developed for achieving reflection self-seeding in hard X-ray free-electron lasers. A high conversion efficiency of a monochromatic seed from a broadband X-ray beam was experimentally evaluated to be 2 × 10–2 with a small optical delay of 119 fs at 10 keV.

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The temporal coherence of hard X-ray free-electron laser pulses was characterized by capturing single-shot interferograms with a versatile interferometer composed of six separate optical elements. The visibility measurements as a function of time delay revealed a mean coherence time of 5.9 ± 0.7 fs.

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Acta Cryst. (2014). A70, C113
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Thalidomide (TD) is a historically famous chiral drug. After prescription as a safe hypnotic, TD was suspected of contributing to teratogenicity, resulting in prohibition of the use of TD. TD and its derivatives, however, have attracted a renewed attention since their therapeutic effects for Hansen's disease and multiple myeloma were demonstrated. Meanwhile TD has been known to suffer from spontaneous hydrolysis with complicated pathways, leading to the production of various metabolites of TD. Therefore, we are now facing the difficulty in specifying the compounds which cause desired and/or adverse effects in the drug mechanism of TD. In a previous study, pure hydrolytic products of TD were synthesized and assayed for production-inhibitory activity of TNF-[alpha], a kind of cytokine that induces inflammation. This study has showed that some products, especially [alpha]-(2-carboxybenzamido)glutarimide (CBG), exhibit high potency for the inhibition of TNF-[alpha] production compared to original TD. The hydrolytic products of TD thus are found to greatly attribute to the pharmacological effect of TD. For comprehending effects of the hydrolytic products, it is much significant to perform physicochemical analysis of them because their properties are deeply related to molecular stability and interaction with receptor proteins. In this study, we thus aim to investigate the physicochemical properties of CBG employing X-ray crystal structural analysis and thermal analyses. Single crystals of racemic and enantiomeric CBG were grown by solvent evaporation methods. On the crystallization, we chose alcoholic solvents such as methanol and ethanol. Surprisingly, crystals grown from the CBG solutions have indicated the same crystal structure of TD with high reproducibility. This unique result is likely to represent dehydration of CBG in non-aqueous solvents, which has not been reported so far. The detailed mechanism is under investigation.

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A feasibility study was performed involving phase-contrast X-ray imaging combined with a crystal X-ray interferometer and the free-electron laser at the SPring-8 Angstrom Compact Free-Electron Laser; X-ray interference patterns and a phase map were successfully obtained.

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