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Valence Transition Induced by Pressure and Magnetic Field in Antiferromagnet EuRh2Si2
Akihiro Mitsuda,Suguru Hamano,Hirofumi Wada 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We report the effects of a magnetic field on a pressure-induced valence transition in EuRh2Si2by using magnetization measurements under high pressure. The M-H curves at 2 K under variouspressures up to 1.18 GPa exhibit no anomalies associated with a field-induced valence transition. Onthe other hand, the M-H curves under a pressure of 1 GPa, where a temperature-induced valencetransition occurs at around 30 K, show a clear metamagnetic transition with a large hysteresis ataround 30 K. This behavior corresponds to a field-induced valence transition. The M-T curvesin magnetic fields indicate that with increasing magnetic field, the temperature-induced valencetransition shifts toward lower temperature and that its thermal hysteresis becomes larger. Coolingthe sample under a pressure of 1 GPa in a magnetic field of 7 T collapses the valence transitionand stabilizes the magnetic high-temperature phase down to 2 K. Besides, with decreasing magneticfield, three sharp valence transitions toward the nonmagnetic Eu3+ direction are observed: 4.65,2.65 and 1.93 T.
Phase Diagram and Eu Valence State in EuPtP1−xAsx
Masaki Sugishima,Akihiro Mitsuda,Hirofumi Wada,Masahiko Isobe,Yutaka Ueda 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
EuPtP is known to exhibit two valence ordering transitions, one at T1 = 235 K and the other atT2 = 190 K. For T > T1, the Eu ions are in the valence fluctuating state. For T2 < T < T1, the Euvalence state is ordered along the c-axis with the sequence of Eu2+-Eu2+-Eu3+-Eu2+-Eu2+-Eu3+. Moreover, the stacking is replaced by another sequence of Eu2+-Eu3+-Eu2+-Eu3+ at temperaturesbelow T2. The substitution of As for P expands the lattice and decreases both T1 and T2. Inthis paper, we report the magnetic susceptibility and electrical resistivity of EuPtP1−xAsx singlecrystals. We observed two valence ordering transitions for 0 ≤ x ≤ 0.4, while a single valenceordering transition was detected for 0.55 ≤ x ≤ 0.6. No valence ordering transitions were observedfor x = 0.7 down to the lowest temperature. Based on the experimental results, we present thephase diagram of EuPtP1−xAsx and discuss the Eu valence state in this system.
Searching for cosmic missing baryons with DIOS - Diffuse Intergalactic Oxygen Surveyor -
Yasushi Suto,Akihiro Furuzawa,Kazuhisa Mitsuda,Manabu Ishida,Noriko Y. Yamasaki,Ryuichi Fujimoto,Shin Sasaki,Tae Furusho,Takaya Ohashi,Yoshitaka Ishisaki,Yuzuru Tawara 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
Approximately 30 to 50 percent of the total baryons in the present universe is supposed to take the form of wa arm/hot intergalactic medium (WHIM) whose X-ray continuum emission is very weak. In order to carry out a direct and homogeneous survey of elusive cosmic missing baryons, we propose a dedicated soft-X-ray mission, DIOS (Diffuse Intergalactic Oxygen Surveyor). The unprecedented energy resolution ( 2eV) of the XSA (X-ray Spectrometer Array) on-board DIOS enables us to identify WHIM with gas temperatures T = 106က7K and overdensity = 10က100 located at z < 0:3 through emission lines of Ovii and Oviii. DIOS, which will hopefully be launched in several years time, promises to open a new window of detection and characterization of cosmic missing baryons and to provide yet another important and complementary tool to trace the large-scale structure of the universe.
우리나라와 일본에서 사용되는 악취판정인 선정방법의 비교
박상진,민태홍,강인선,이희성,이민도,Mitsuda megumi 한국냄새환경학회 2006 실내환경 및 냄새 학회지 Vol.5 No.4
Two study were carried out to get basic data to improve the olfactory odor estimation method. The first study was to observe the odor intensity of reagents used to select the panel in Korea and Japan. And the second study was to compare the ratio of successful applicants of panel selection between Korea and Japan. As a results, it was observed that the average odor intensity of panel selection reagents in Korea is 3.8 degree and the one of Japan 1.8 degree. As the ratio of successful applicants of Japan method 88% is higher then the one of Korea mothed 30%, it was estimated that Korea method is more strict than Japan method. 본 연구는 후각측정방법을 개선하기 위한 기초자료를 수집할 목적으로, 한국과 일본에서 사용되는 악취판정인 선정시약의 악취강도를 조사하였고, 두 나라에서 사용되는 악취판정인 선정시험 방법의 합격률을 비교 조사하였다. 조사결과, 한국에서 사용되는 악취판정인 선정시약의 평균 악취강도는 2.3도 였으며, 일본시약의 평균강도는 1.8도인 것으로 나타났다. 따라서 현재의 악취판정인 선정기준 악취강도는 좀 더 보완될 필요가 있는 것으로 나타났다. 한편 50명의 피검자를 대상으로 동일한 조건하에서 각 나라의 방법대로 악취판정인 선정시험을 수행한 결과, 일본방법의 경우 전체의 88%가 합격한 반면 한국방법의 합격률은 30%에 불과한 것으로 나타났다. 따라서 악취판정인 선정은 일본보다 한국이 더 엄격한 것으로 나타났다.
An alternative spliced mouse presenilin-2 mRNA encodes a novel γ-secretase inhibitor
Suzuki, Y.,Ohta, K.,Itoh, M.,Sakoh-Sumitomo, Y.,Mitsuda, T.,Ueda, M.,Hayakawa-Yano, Y.,Li, S.,Hida, Y.,Inuzuka, T.,Jung, Y.K.,Nakagawa, T. North-Holland Pub ; Elsevier Science Ltd 2009 FEBS letters Vol.583 No.9
The γ-secretase, composed of presenilin-1 (PS1) or presenilin-2 (PS2), nicastrin (NCT), anterior pharynx-defective phenotype 1 (APH-1), and PEN-2, is critical for the development of Alzheimer's disease (AD). PSs are autoproteolytically cleaved, producing an N-terminal fragment (NTF) and a hydrophilic loop domain-containing C-terminal fragment. However, the role of the loop domain in the γ-secretase complex assembly remains unknown. Here, we report a novel PS2 isoform generated by alternative splicing, named PS2β, which is composed of an NTF with a hydrophilic loop domain. PS2β disturbed the interaction between NCT and APH-1, resulting in the inhibition of amyloid-β production. We concluded that PS2β may inhibit γ-secretase activity by affecting the γ-secretase complex assembly. Structured summary: MINT-7025654: APH1 (uniprotkb:Q96BI3) physically interacts (MI:0218) with PEN2 (uniprotkb:Q9NZ42), PS2 beta (uniprotkb:Q61144-2) and PS1 (uniprotkb:P49769) by anti tag coimmunoprecipitation (MI:0007) MINT-7025631: APH1 (uniprotkb:Q96BI3) physically interacts (MI:0218) with NCT (uniprotkb:Q92542), PEN2 (uniprotkb:Q9NZ42) and PS1 (uniprotkb:P49769) by anti tag coimmunoprecipitation (MI:0007)