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255 results on '"Uchikoshi T"'

1. Cluster glass transition and relaxation in random spinel CoGa2O4

Author

Naka, T., Nakane, T., Ishii, S., Nakayama, M., Ohmura, A., Ishikawa, F., de Visser, A., Abe, H., and Uchikoshi, T.

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Disordered Systems and Neural Networks
Abstract

We report magnetic properties in the random spinel magnet CoGa2O4. Rietveld analysis of the x-ray diffraction profile for CoGa2O4 reveals that the Co and Ga ions are distributed randomly in the tetrahedral A-sites and octahedral B-sites in the cubic spinel structure. CoGa2O4 exhibits a spin-glass transition at TSG = 8.2 K that is confirmed by measurements of the dc- and ac-susceptibilities and thermoremanent magnetization (TRM) that develops below TSG. From the frequency dependence of the freezing temperature Tf for CoGa2O4, it is indicated that the relaxation time follows a Vogel-Fulcher law. Magnetic entropy is considerably reduced, probably because magnetic cluster formation developed even at T > TSG. The relaxation rate of TRM is considerably enhanced at TSG and decays rapidly above and below TSG. The time course of TRM is reproduced by non-exponential relaxation forms, such as a stretched exponential (Kohlrausch) as well as Ogielski and Weron relaxation forms. This behavior is displayed universally in glass systems, and the characteristic parameters associated with these functions were reasonable., Comment: 34 pages, 14 figures, 3 table

Published
2020
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11. Elucidation of crystal-chemical determination factor of magnetic anisotropy in HTSC

Author

Ishihara, A., Horii, S., Uchikoshi, T., Suzuki, T.S., Sakka, Y., Ogino, H., Shimoyama, J.-i., and Kishio, K.

Subjects
Copper oxide superconductors -- Magnetic properties, Copper oxide superconductors -- Electric properties, High temperature superconductors -- Analysis, Magnetization -- Analysis, Rare earth metals -- Magnetic properties, Rare earth metals -- Electric properties, Business, Electronics, Electronics and electrical industries
Published
2009

12. 3-dimensional grain orientation of RE-Ba-Cu-O superconductors using a modulated oval magnetic field

Author

Fukushima, T., Horii, S., Uchikoshi, T., Ogino, H., Ishihara, A., Suzuki, T.S., Sakka, Y., Shimoyama, J.-i., and Kishio, K.

Subjects
Barium compounds -- Electric properties, Barium compounds -- Magnetic properties, Copper oxide superconductors -- Magnetic properties, Copper oxide superconductors -- Electric properties, Magnetic fields -- Analysis, Rare earth metals -- Magnetic properties, Rare earth metals -- Electric properties, Business, Electronics, Electronics and electrical industries
Published
2009

39. Formation Mechanism of Transparent Mo6 Metal Atom Cluster Film Prepared by Electrophoretic Deposition.

Author

Nguyen, T. K. N., Dierre, B., Grasset, F., Renaud, A., Cordier, S., Lemoine, P., Ohashi, N., and Uchikoshi, T.

Subjects
ELECTROPHORETIC deposition, MOLYBDENUM
Abstract

Among the solution deposition techniques, electrophoretic deposition (EPD) is a fairly rapid and low cost two-step process well-known for ceramic shaping and conductive surface coating. Recently we have reported the fabrication of transparent inorganic thin film composed of octahedral molybdenum clusters and shown that the stabilization of the cluster solutions during EPD is very important to obtain high quality films. In this study, we selected the Cs2Mo6Bri8Bra6 or ((n-C4H9)4N)2Mo6Bri8Bra6 clusters compound (i = inner ligands, a = apical ligands) as precursors in a Methyl Ethyl Ketone (MEK) solution to fabricate the inorganic Mo6 cluster transparent film on a conductive indium tin oxide (ITO) glass substrate. For the first time, the mechanism for the deposition process of metal clusters is proposed based on results obtained by the combination of complementary techniques such as infrared spectroscopy, X-ray analysis and electron microscopy. The Mo6 film on the ITO glass substrate exhibiting a Br-rich layer is quickly deposited during the first stage of the EPD followed by a multilayer structure consisting of two types of cluster compounds, [Mo6Bri8Bra4(H2O)a2] and (H3O)2[Mo6Bri8Bra4(OH)a2]. [ABSTRACT FROM AUTHOR]

Published
2017
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44. Mechanisms of alcoholic liver disease: cytokines

Author

Abe, M., Akbar, S. M. F., Brenner, D. A., Cameron, R. G., Chollet-Martin, S., Cohard, M., Gao, B., Garaud, J. J., Horiike, N., Katz, G. G., Kumagi, T., Maeyama, S., Michitaka, K., Neuman, M. G., Ohata, M., Onji, M., Thierry Poynard, Rehermann, B., Saito, S., Shear, N. H., Taieb, J., Takamatsu, M., Toda, G., Uchikoshi, T., and Yamauchi, M.

Subjects
Liver Cirrhosis, Mitogen-Activated Protein Kinase 1, Mitogen-Activated Protein Kinase 3, Polymorphism, Genetic, Alcohol Drinking, Tumor Necrosis Factor-alpha, Interleukins, Medicine (miscellaneous), Hepacivirus, Toxicology, Psychiatry and Mental health, Interferon-gamma, Phosphatidylcholines, Animals, Cytokines, Humans, Mitogen-Activated Protein Kinases, Liver Diseases, Alcoholic, Macrophage Migration-Inhibitory Factors, Protein Kinase C
Abstract

This article represents the proceedings of a workshop at the 2000 ISBRA Meeting in Yokohama, Japan. The chair was Manuela G. Neuman. The presentations were (1) New aspects of hepatic fibrosis, by D. A. Brenner; (2) Cellular immune response in hepatitis C models, by B. Rehermann; (3) The role of interleukin-10 in acute alcoholic hepatitis, by J. Taieb, S. Chollet-Martin, M. Cohard, J. J. Garaud, and T. Poynard; (4) Cytokine-mediated apoptosis in vitro, by M. G. Neuman; (5) Signaling for apoptosis and repair in vitro, by G. G. Katz, R. G. Cameron, N. H. Shear, and M. G. Neuman; (6) Interferons activate the P42/44 mitogen-activated protein kinase and Janus Kinase signal transducers and activation of transcription (JAK-STAT) signaling pathways in hepatocytes: Differential regulation by acute ethanol via a protein kinase C-dependent mechanism, by B. Gao; (7) Genetic polymorphisms of interleukin-1 in association with the development of Japanese alcoholic liver disease, by M. Takamatsu, M. Yamauchi, M. Ohata, S. Saito, S. Maeyama, T. Uchikoshi, and G. Toda; and (8) Increased levels of macrophage migration inhibitory factor in sera from patients with alcoholic liver diseases, by T. Kumagi, S. M. F. Akbar, M. Abe, K. Michitaka, N. Horiike, and M. Onji.

Published
2001

46. Expression of the G2-M checkpoint regulators cyclin B1 and cdc2 in nonmalignant and malignant human breast lesions: immunocytochemical and quantitative image analyses

Author

Kawamoto, H., Koizumi, H., and Uchikoshi, T.

Subjects
G2 Phase, Breast Diseases, Cyclins, CDC2 Protein Kinase, Image Interpretation, Computer-Assisted, Humans, Mitosis, Breast Neoplasms, Cyclin B, Cyclin B1, Immunohistochemistry, Research Article
Abstract

We investigated the in vivo expression of cyclin B1 and Cdc2 (key molecules for G2-M transition during the cell cycle) in nonmalignant and cancerous human breast lesions using immunohistochemistry and quantitative proliferative index (PI) analysis. Breast epithelial cells co-expressed cyclin B1 and Cdc2 in their cytoplasm in the G2 phase and in their nuclei in the M phase. Cyclin B1, but not Cdc2, immunostaining rapidly disappeared from the nuclei during the mitotic metaphase to anaphase transition. Static image analysis revealed the mean proliferative index for cyclin B1/cdc2 for each type of lesion to be as follows: normal glands (n = 20), 2.0/2.5%; benign lesions, including typical ductal hyperplasia (n = 76), 2.5/5.8%; atypical ductal hyperplasia (n = 21), 3.0/6.6%; carcinomas in situ (n = 70), 7.4/14.0%; and invasive carcinomas (n = 58), 10.0/22.9%. Proliferative index data for atypical hyperplasia were virtually identical to those for benign lesions and were significantly lower than those for breast cancer, suggesting that expression levels of cyclin B1 and Cdc2 may be used to distinguish premalignant human breast lesions from advanced disease. Furthermore, the proliferative index for cyclin B1 for comedo-type ductal carcinomas in situ agreed with that for invasive ductal carcinomas (mean, 10.1% versus 9.5%), apparently explaining the clinicopathological aggressiveness of this tumor at the molecular level.

Published
1997

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