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289 results on '"Arikawa, T."'

57. Ethylene Promotes Submergence-Induced Expression of OsABA8ox1, a Gene that Encodes ABA 8'-Hydroxylase in Rice

Author

Saika, H., primary, Okamoto, M., additional, Miyoshi, K., additional, Kushiro, T., additional, Shinoda, S., additional, Jikumaru, Y., additional, Fujimoto, M., additional, Arikawa, T., additional, Takahashi, H., additional, Ando, M., additional, Arimura, S.-i., additional, Miyao, A., additional, Hirochika, H., additional, Kamiya, Y., additional, Tsutsumi, N., additional, Nambara, E., additional, and Nakazono, M., additional

Published
2006
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74. Immunohistochemical studies on EGF family growth factors in normal and ulcerated human gastric mucosa.

Author

Abe, Shinya, Sasano, Hironobu, Katoh, Katsuaki, Ohara, Shuichi, Arikawa, Tadashi, Noguchi, Tetsuya, Asaki, Shigeru, Yasui, Wataru, Tahara, Eiichi, Nagura, Hiroshi, Toyota, Takayoshi, Abe, S, Sasano, H, Katoh, K, Ohara, S, Arikawa, T, Noguchi, T, Asaki, S, Yasui, W, and Tahara, E

Subjects
PROTEIN metabolism, CELL division, EPIDERMAL growth factor, GASTRIC mucosa, GLYCOPROTEINS, GROWTH factors, IMMUNOENZYME technique, MEMBRANE proteins, PEPTIC ulcer, PROTEINS, WOUND healing, MEMBRANE glycoproteins
Abstract

Expression of members of the epidermal growth factor family, including epidermal growth factor (EGF), transforming growth factor-alpha (TGF-alpha), amphiregulin (AR), and Cripto, as well as their putative receptor, epidermal growth factor receptor (EGFR), was studied immunohistochemically in human gastric mucosa to evaluate their possible roles in cell proliferation of normal and regenerative gastric mucosa. We also examined the correlation betwen cell proliferation and EGFR by double immunohistochemical staining for proliferating cell nuclear antigen (PCNA) and EGFR. In normal gastric mucosa, TGF-alpha, Cripto, and AR immunoreactivities were observed in the surface epithelial and parietal cells of gastric fundic glands, respectively. EGF immunoreactivity was not observed in any of normal mucosa examined. EGFR immunoreactivity was detected on foveolar cells in proliferative zones and in parietal cells. Double immunostaining revealed that EGFR immunoreactivity was distributed much more widely than PCNA immunoreactivity. PCNA positive epithelial cells adjacent to gastric ulcer margin expressed relatively intense EGFR but did not express any of the growth factors examined. On the other hand, relatively intense immunoreactivity of both TGF-alpha and Cripto was detected in PCNA-negative regenerative epithelium located distant from gastric ulcer margin. Relative immunoreactivity of AR in regenerative gastric epithelium associated with ulcer was not different from that in normal gastric mucosa. TGF-alpha, AR, and Cripto are considered to play important roles in normal gastric mucosal proliferation, and TGF-alpha and Cripto may be involved in ulcer healing, possibly via a paracrine mechanism. [ABSTRACT FROM AUTHOR]

Published
1997
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76. Characterization of the Structure of RuO<INF>2</INF>−IrO<INF>2</INF>/Ti Electrodes by EXAFS

Author

Arikawa, T., Takasu, Y., Murakami, Y., Asakura, K., and Iwasawa, Y.

Abstract

The structure of oxide layers of the RuO2−IrO2/Ti electrode system and the thermal decomposition processes of RuCl3 and IrCl3 to form their respective oxides have been mainly analyzed by EXAFS (extended X-ray absorption fine structure) and XRD (X-ray diffraction). Upon heating of the respective chlorides in air, both chlorides convert into their respective oxides. The coordination numbers of the oxide ions around both the ruthenium and iridium ions increased with an increase in the calcination temperature and attained 6, which is the theoretical value of the standard samples of rutile RuO2 and IrO2. The changes in the coordination number with respect to the calcination temperature were accompanied by changes in the lattice constants of these oxides. This suggests that the deviation of these parameters from the standard sample is caused by the lattice defects of the oxide ions. A dependence of the radial distribution functions of EXAFS on the composition of the RuO2−IrO2/Ti electrode system showed that RuO2 forms a solid solution with IrO2 for the binary oxide electrode system.

Published
1998

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