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Ho-doping Effect on the Incommensurate Magnetic Order in La1.88Sr0.12CuO4
Masaki Fujita,Masanori Enoki,Kenji Tsutsumi,Satoshi Iikubo,Kazuyoshi Yamada 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We have performed elastic neutron scattering experiments on the superconductorLa1.85Ho0.03Sr0.12CuO4 to study the effect of substitution of a cation with a large magnetic momentat La site on the static spin correlation. In the Ho-free sample with a hole concentration of 0.12,the spatially-modulated magnetic order is known to be stabilized at temperature below Tspin 30K. In the present Ho-doped sample, we found the appearance of magnetic peaks at (0.5, 0.5 ± 0.119, 0) positions below Tspin 35 K, which is similar to the observation in the pristine sample. Furthermore, the volume-corrected intensities in the Ho-free and Ho-doped samples are comparable,suggesting a negligible effect of Ho-substitution at La sites. These results are quite a contrast tothe huge enhancement of the magnetic intensity and the increase of Tspin by substituting a comparableamounts of magnetic Fe3+ ions onto CuO2 planes. Therefore, the stability of the stripe orderinduced by the cation substitution is sensitive to the site at which the substitution occurs.
Inokuma, Yasuhide,Kawano, Masaki,Fujita, Makoto Nature Publishing Group, a division of Macmillan P 2011 Nature chemistry Vol.3 No.5
<P>A variety of host compounds have been used as molecular-scale reaction vessels, protecting guests from their environment or restricting the space available around them, thus favouring particular reactions. Such molecular 'flasks' can endow guest molecules with reactivities that differ from those in bulk solvents. Here, we extend this concept to crystalline molecular flasks, solid-state crystalline networks with pores within which pseudo-solution-state reactions can take place. As the guest molecules can spontaneously align along the walls and channels of the hosts, structural changes in the substrates can be directly observed by in situ X-ray crystallography during reaction. Recently, this has enabled observation of the molecular structures of transient intermediates and other labile species, in the form of sequential structural snapshots of the chemical transformation. Here, we describe the principles, development and applications of crystalline molecular flasks.</P>
( Ryuichi Nakamura ),( Kenji Fujita ),( Rei Omi ),( Kazunari Kuroda ),( Masaki Takahashi ),( Kazumi Ikebuchi ),( Hitoshi Nishimura ),( Yasuo Katsuki ) 대한슬관절학회 2017 대한슬관절학회지 Vol.29 No.3
Since distal femoral varus osteotomy (DFO) -specific plates had not been available in Japan before 2015, we performed DFO using a plate for tibia. The purpose of this study was to elucidate the efficacy and problems associated with the non-specific plate in DFO. We used NCB-PT plates (Zimmer Inc.) in the upside-down position and the minimum 5-year outcomes were evaluated. The mean preoperative weight bearing line ratio and Japanese Orthopaedic Association score improved from 97.6%±35.8% and 68.0±11.5, respectively, to 44.0%±16.1% and 82.0±7.6, respectively, 1 year postoperatively and to 42.8%±15.7% and 86.0±8.2, respectively, 5 years postoperatively. The flexion range decreased from 149.0°±6.5° to 138.0°±5.7° 1 year postoperatively and to 135.0°±20.9° 5 years postoperatively. Although DFO using the NCB-PT plate provided mid-term benefits, it resulted in a loss of knee flexion, possibly due to excessive coverage of the medial femoral epicondyle.
High-energy Magnetic Excitations in Underdoped La1.90Sr0.10CuO4
Kentaro Sato,Masato Matsuura,Masaki Fujita,Ryoichi Kajimoto,Sungdae Ji,Kazuhiko Ikeuchi,Mitsutaka Nakamura,Yasuhiro Inamura,Masatoshi Arai,Masanori Enoki,Kazuyoshi Yamada 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We measured the magnetic excitations in underdoped (UD) La1.90Sr0.10CuO4 by using inelasticneutron scattering over a wide energy range. We succeeded in observing the high-energy excitationsup to '160 meV. Hour-glass-like magnetic excitation, which is commonly seen in the superconductingphase of cuprate oxides, was confirmed. The Ecross (the energy where the dispersion is closestto the ( 12 , 12 ) reciprocal position) of 40 meV follows a linear relation between Ecross and the dopedhole concentration in the UD region. From the dispersion of high-energy excitations above Ecross,we successfully found an effective nearest neighbor interaction (Jeff ) of 102 ± 2 meV. This Jeff issmaller than the nearest neighbor interaction J(=132 meV) in the parent compound La2CuO4,indicating a reduction of Jeff by hole-doping.
Clinical Features of Lung Cancer in Japanese Patients Aged Under 50
Igata, Fumiyasu,Uchino, Junji,Fujita, Masaki,Iwasaki, Akinori,Watanabe, Kentaro Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.7
The proportion of lung cancer patients under 50 years old is small at approximately 5-10%, but as with patients older than 50, the number is on the rise. Although lung cancer treatment strategies have undergone extensive transformation in recent years based on the presence or absence of oncogenic driver mutations, there are few reports regarding these mutations in the young or the relationship between clinical setting and prognosis. Therefore, we conducted a study of clinical features in 36 patients under the age of 50 who were diagnosed with primary lung cancer from October 2008 to November 2015. The 22 patients in stages I through III A underwent operations, and all 17 whose lung cancer were detected through screening were candidates for surgery. Gene analysis was conducted for 26 (72.2%); 10 (38.5%) were positive for EGFR gene mutations, and ALK gene translocation was present in 4 (15.4%). In stage IV patients, the median progression free survival (PFS) in the ALK translocation positive and negative patients was 518 days and 130 days, respectively, and the median overall survival (OS) was not reached and 280 days, respectively. A trend toward extended PFS (p=0.203) and OS (p=0.056) was observed in patients positive for ALK translocation. We must strive for early detection by increasing screening rates and evaluate oncogenic driver mutations important for prognosis of lung cancer in the young.
Hirano, Ryosuke,Uchino, Junji,Ueno, Miho,Fujita, Masaki,Watanabe, Kentaro Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.2
A key drug for treatment of EGFR mutation-positive non-small cell lung cancer is epidermal growth factor receptor-tyrosine kinase inhibitor (EGFR-TKI). While the dosage of many general anti-tumor drugs is adjusted according to the patient body surface area, one uniform dose of most TKIs is recommended regardless of body size. In many cases, dose reduction or drug cessation is necessary due to adverse effects. Disease control, however, is frequently still effective, even after dose reduction. In this study, we retrospectively reviewed the characteristics of 26 patients at Fukuoka University Hospital between January 2004 and January 2015 in whom the EGFR-TKI dose was reduced with respect to progression free survival and overall survival. There were 10 and 16 patients in the gefitinib group and the erlotinib group, respectively. The median progression-free survival in the gefitinib group and the erlotinib group was 22.4 months and 14.1 months, respectively, and the median overall survival was 30.5 months and 32.4 months, respectively. After stratification of patients by body surface area, the overall median progression-free survival was significantly more prolonged in the low body surface area (<1.45 m2) group (25.6 months) compared to the high body surface area (>1.45 m2) group (9.7 months) (p=0.0131). These results indicate that low-dose EGFR-TKI may sufficiently control disease without side effects in lung cancer patients with a small body size.
Anisotropic Spin Excitations in Spin-Peierls CuGeO3
Kazuhiko Ikeuchi,Ryoichi Kajimoto,Fumio Mizuno,Masaki Fujita,Yasuhiro Inamura,Mitsutaka Nakamura,Kenji Nakajima,Kazuya Aizawa,Masatoshi Arai 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We report on the investigation of spin excitations in CuGeO3 at a low temperature by usinginelastic neutron scattering on a pulsed source with a time-of-flight analysis. By observing thedispersion relation of spin excitations not only along the chain direction but also along the interchain direction, we studied spin correlations in the S = 1/2 Heisenberg chains, as well as between thechains, in detail. The results show a clear anisotropy of the magnetic excitations at a temperaturebelow the spin-Peierls transition temperature.
Martí,‐,Rujas ,, Javier,Islam, Nazrul,Hashizume, Daisuke,Izumi, Fujio,Fujita, Makoto,Song, Hyun Jae,Choi, Hee Cheul,Kawano, Masaki WILEY‐VCH Verlag 2011 Angewandte Chemie Vol.123 No.27
<P><B>Synchrotron‐Pulver‐XRD</B>‐Analysen führten zur Kristallstruktur eines unter kinetischer Kontrolle gebildeten Koordinationspolymers mit großer Elementarzelle (15 729(1) Å<SUP>3</SUP>). In den Poren dieses Gerüsts sind Tetrathiafulvalenmoleküle mit kleinen S<B>⋅⋅⋅</B>S‐Abständen eingeschlossen (siehe Bild).</P>
Solid–liquid interface synthesis of microcrystalline porous coordination networks
Martí,-Rujas, Javier,Matsushita, Yoshitaka,Izumi, Fujio,Fujita, Makoto,Kawano, Masaki Royal Society of Chemistry 2010 Chemical communications Vol.46 No.35
<P>Solid–liquid interface synthesis provided a unique way to selectively and efficiently prepare molecular complexes (ML<SUB>2</SUB>) and metastable porous coordination networks in short crystallization times. In sharp contrast, their solution reactions gave interpenetrated open-framework networks. We succeeded in solving a crystal structure of the metastable network by <I>ab initio</I> powder X-ray analysis.</P> <P>Graphic Abstract</P><P>Solid–liquid interface synthesis provided a unique way to selectively and efficiently generate crystalline monomers and metastable porous coordination networks. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cc01141j'> </P>
Naohiko Yasuda,Aritoshi Nakada,Hidehiro Ohwa,Ikuo Suzuki,Kazuhiko Fujita,Makoto Iwata,Masaki Maeda,Ryouko Ozao,Yoshihiro Ishibashi 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
The relation between polarization P and electric eld E in the solid solutions (1 .. x)Pb(Sc1=2Ta1=2)O3-xPbZrO3(PST-PZ) was investigated with the successive antiferroelectric (AFE) - ferroelectric(FE) - paraelectric(PE) phase transition with heating in the range of PZ compositions x > 0:8. It was found that P{E hysteresis loops change from the double P{E loop to the single one, re ecting the phase transition from AFE to FE. For the switching behavior in the AFE phase, it was found that the electric eld dependence of the reciprocal switching time and the peak switching current which characterize the switching transient consists of two parts ; one is the linear part at the high-eld region and the other is the curved part at the low-eld region.