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Okayama, Japan

Okayama University of Science is a private university in Okayama, Okayama, Japan, established in 1964. Wikipedia.

Toyota S.,Okayama University of Science
Pure and Applied Chemistry | Year: 2012

To create novel π-conjugated compounds, we constructed various molecular architectures from anthracene units and acetylene linkers. Several cyclic oligomers ranging from dimers to dodecamers were synthesized by macrocyclization of acyclic precursors with metal-catalyzed coupling reactions. The structures, dynamic behavior, and spectroscopic features were greatly influenced by the number of anthracene units and the combination of building units and linkers. Optically active and circular dichroism (CD)-active enantiomers of some chiral cyclic oligomers were resolved by chiral high-performance liquid chromato - graphy (HPLC). Conformational analysis of hexamers and higher oligomers was performed with the aid of density functional theory (DFT) calculations. Acyclic oligomers underwent reversible folding-unfolding processes via photochemical and thermal reactions. These results suggest that transannular π-π interactions between anthracene units are important factors in controlling the structural and spectroscopic properties and functions of π-conjugated compounds. The scope and perspectives of this molecular design are discussed on the basis of previous studies. © 2012 IUPAC. Source

Sato Y.,Okayama University of Science
Journal of clinical and experimental hematopathology : JCEH | Year: 2012

IgG4-related disease is a recently proposed clinical entity with several unique clinicopathological features. A chronic inflammatory state with marked fibrosis, which can often be mistaken for malignancy, especially by clinical imaging analyses, unifies these features. In the present report, we describe a case of IgG4-producing mucosa-associated lymphoid tissue lymphoma mimicking IgG4-related disease. The patient was a 55-year-old male who was being followed for right orbital tumor over 1.5 years. The lesion had recently increased in size, so a biopsy was performed. Histologically, the lesion was consistent with IgG4-related disease ; however, IgG4+ plasma cells showed immunoglobulin light-chain restriction and immunoglobulin heavy chain gene rearrangement was detected in the lesion. Therefore, the lesion was diagnosed as IgG4-producing mucosa-associated lymphoid tissue lymphoma. In conclusion, in histological diagnosis of IgG4-related disease, it is important to examine not only IgG4-immunostain but also immunoglobulin light-chain restriction. Source

Morishige K.,Okayama University of Science
Journal of Physical Chemistry C | Year: 2011

To examine the origin of the lack of hysteresis between freezing and melting for Kr confined in the hexagonal pores with crystalline carbon walls, we measured X-ray diffraction patterns from Kr adsorbed in the ordered mesoporous carbon as a function of pore filling at three temperatures in the vicinity of the freezing point of a confined phase. The results clearly indicate that the structure of the first layer adjacent to the pore walls formed at a temperature below the freezing point is compatible with the 3D structure of the confined bulk crystal. In addition, the first bilayer adjacent to the crystalline walls of the mesoporous carbon still keeps its crystallinity at a temperature 6 K higher than the freezing point. Therefore, for a liquid Kr confined in the crystalline carbon pores, the crystalline bilayer film that is commensurate with the bulk structure of the confined solid Kr is already in place at a boundary between the liquid and the carbon pore walls at the equilibrium freezing point and thus plays a role as a critical nucleus in freezing of the interior phase. © 2011 American Chemical Society. Source

Morishige K.,Okayama University of Science
Journal of Physical Chemistry C | Year: 2011

Adsorption and separation of CO2/CH4 were examined on two kinds of amorphous silica molecular sieves, ASMS-3A and ASMS-5A, that are composed of spherical cavities arranged in a face-centered-cubic array and connected through narrow necks of molecular dimensions. For ASMS-3A, the exclusion of CH4 molecules due to their dimensions into the narrow necks and preferential adsorption of CO2 with the smaller kinetic diameter is observed at 283 K. In addition, the amount of CO2 adsorbed at 283 K does not decrease at all with surface hydration. All these results suggest that ASMS-3A is a promising candidate for the separation and purification of CO2 from various CO2/CH4 mixtures such as natural gas and landfill gas by a PSA process. © 2011 American Chemical Society. Source

Hayashi K.-I.,Okayama University of Science
Plant and Cell Physiology | Year: 2012

IAA, a naturally occurring auxin, is a simple signaling molecule that regulates many diverse steps of plant development. Auxin essentially coordinates plant development through transcriptional regulation. Auxin binds to TIR1/AFB nuclear receptors, which are F-box subunits of the SCF ubiquitin ligase complex. The auxin signal is then modulated by the quantitative and qualitative responses of the Aux/IAA repressors and the auxin response factor (ARF) transcription factors. The specificity of the auxin-regulated gene expression profile is defined by several factors, such as the expression of these regulatory proteins, their post-transcriptional regulation, their stability and the affinity between these regulatory proteins. Auxin-binding protein 1 (ABP1) is a candidate protein for an auxin receptor that is implicated in non-transcriptional auxin signaling. ABP1 also affects TIR1/AFB-mediated auxin-responsive gene expression, implying that both the ABP1 and TIR1/AFB signaling machineries coordinately control auxin-mediated physiological events. Systematic approaches using the comprehensive mapping of the expression and interaction of signaling modules and computational modeling would be valuable for integrating our knowledge of auxin signals and responses. © 2012 The Author. Source

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