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RADIATION SAFETY STUDIES AT TOHOKU UNIVERSITY CYRIC
Yamadera, M. Baba A.,Miura, T.,Aoki, T.,Hagiwara, M.,Kawata, N. 대한방사선 방어학회 2001 방사선방어학회지 Vol.26 No.3
A brief introduction is presented on the radiation safety studies at Tohoku University Cyclotron & Radioisotope Center. Studios on two subject are described; (1) measurement of the thick target neutron yield and radioisotope production / activation cross section for ten's of MeV neutrons and ions using K=110 Tohoku University cyclotron to provide basicdata fur accelerator shielding, and (2) development of techniques for high sensitive radiation detection and profile measurement using an Imaging Plate which is a high sensitive two-dimensional radiation sensor. Application of the Imaging Plate techniques to localization of very weak radioactivity and to neutron profile measurement is described.
Sueyoshi, Mitsuhiro,Furue, Toshihiko,Sato, Akihiro,Yokoyama, Kenichi,Yamadera, Yoshimi,Fujiwara, Kiyoshi,Matsuda, Katsuhiko 한국부식방식학회 2002 Corrosion Science and Technology Vol.31 No.5
Aluminum brass tubing which is highly cost-effective and has a high heat transfer property has been widely used for seawater cooled condenser in Japan. However, the tubing suffers from erosion and corrosion on the inner surface in spite of ferric-ion injection and cathodic protection. Ammonia also attacks the outer surface after long years of service. Periodic replacement with new tubing has been performed. Titanium tubing which has high corrosion resistance, has been used in new condensers and for the air removal zone of the condenser. However, its service has been restricted due to higher cost and lower elastic modulus. As a countermeasure, we have developed a high performance ferritic stainless steel tubing called "Super Stainless: FS1O" which has excellent corrosion resistance and is highly cost-effective. First, the tubings were used experimentally in our Buzen thermal power station, Unit 2 condenser in 1993, and various investigations have been performed on the extracted tubing and tube sheet every year. Ammonia attack on the outer surface, corrosion and erosion on the inner surface, crevice corrosion between the tube and the tube-sheet. Hz absorption and degradation of properties was not observed. Based on these results, 1,006 pieces of FS1O were installed in Buzen thermal power station, Unit I condenser in 1996. The tubing has been used in seawater without any corrosion problems.
Cytoplasmic destruction of p53 by the endoplasmic reticulum-resident ubiquitin ligase ‘Synoviolin’
Yamasaki, Satoshi,Yagishita, Naoko,Sasaki, Takeshi,Nakazawa, Minako,Kato, Yukihiro,Yamadera, Tadayuki,Bae, Eunkyung,Toriyama, Sayumi,Ikeda, Rie,Zhang, Lei,Fujitani, Kazuko,Yoo, Eunkyung,Tsuchimochi, K Wiley (John WileySons) 2007 The EMBO journal Vol.26 No.1
<P>Synoviolin, also called HRD1, is an E3 ubiquitin ligase and is implicated in endoplasmic reticulum -associated degradation. In mammals, Synoviolin plays crucial roles in various physiological and pathological processes, including embryogenesis and the pathogenesis of arthropathy. However, little is known about the molecular mechanisms of Synoviolin in these actions. To clarify these issues, we analyzed the profile of protein expression in synoviolin-null cells. Here, we report that Synoviolin targets tumor suppressor gene p53 for ubiquitination. Synoviolin sequestrated and metabolized p53 in the cytoplasm and negatively regulated its cellular level and biological functions, including transcription, cell cycle regulation and apoptosis. Furthermore, these p53 regulatory functions of Synoviolin were irrelevant to other E3 ubiquitin ligases for p53, such as MDM2, Pirh2 and Cop1, which form autoregulatory feedback loops. Our results provide novel insights into p53 signaling mediated by Synoviolin.</P>