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Effect of Pressure on the Intermediate-valence Semiconductor SmB6 : 11B-NMR
Kohei Nishiyama,Takeshi Mito,Ko-ichi Ueda,Takehide Koyama,Takao Kohara,Gabriel Prist´aˇs,Slavom´ır Gab´ani,Mari´an Reiffers,Karol Flachbart,Yasuhiro Komaki,Mitsutane Kokubu,Hideto Fukazawa,and Yoh Koh 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We report the first high-pressure 11B-NMR studies above 3 GPa on the intermediate-valencesemiconductor SmB6. A 11B-NMR line obtained at 4.9 GPa, the highest pressure for the measurements,and at 1.9 K shows quite similar a line shape to that at ambient pressure, indicating nostructural or magnetic phase transition up to this pressure. The temperature dependence of thespin lattice relaxation rate 1/T1 at 4.9 GPa still exhibits an activation-type temperature dependencecharacteristic of semiconductors, which reveals an obvious decrease in the insulating gap byabout 30% compared to the gap at ambient pressure. The present experimental facts of a finiteinsulator gap and no magnetic order at 4.9 GPa are consistent with recent transport measurementsperformed under better hydrostatic pressures.
Gao, Shuyan,Koshizaki, Naoto,Tokuhisa, Hideo,Koyama, Emiko,Sasaki, Takeshi,Kim, Jae-Kwan,Ryu, Joonghyun,Kim, Deok-Soo,Shimizu, Yoshiki WILEY-VCH Verlag 2010 Advanced Functional Materials Vol.20 No.1
<P>Colloidal Au-amplified surface plasmon resonance (SPR), like traditional SPR, is typically used to detect binding events on a thin noble metal film. The two major concerns in developing colloidal Au-amplified SPR lie in 1) the instability, manifested as a change in morphology following immersion in organic solvents and aqueous solutions, and 2) the uncontrollable interparticle distance, determining probe spacing and inducing steric hindrance between neighboring probe molecules. This may introduce uncertainties into such detecting techniques, degrade the sensitivity, and become the barricade hampering colloidal Au-based transducers from applications in sensing. In this paper, colloidal Au-amplified SPR transducers are produced by using ultrathin Au/Al<SUB>2</SUB>O<SUB>3</SUB> nanocomposite films via a radio frequency magnetron co-sputtering method. Deposited Au/Al<SUB>2</SUB>O<SUB>3</SUB> nanocomposite films exhibit superior stability, and average interparticle distances between Au nanoparticles with similar average sizes can be tuned by changing surface coverage. These characteristics are ascribed to the spacer function and rim confinement of dielectric Al<SUB>2</SUB>O<SUB>3</SUB> and highlight their advantages for application in optimal nanoparticle-amplified SPR, especially when the probe size is smaller than the target molecule size. This importance is demonstrated here for the binding of protein (streptavidin) targets to the probe (biotin) surface. In this case, the dielectric matrix Al<SUB>2</SUB>O<SUB>3</SUB> is a main contributor, behaving as a spacer, tuning the concentration of Au nanoparticles, and manipulating the average interparticle distance, and thus guaranteeing an appropriate number of biotin molecules and expected near-field coupling to obtain optimal sensing performance.</P> <B>Graphic Abstract</B> <P>An innovative colloidal Au-amplified surface plasmon resonance (SPR) transducer is achieved by a using remarkably stable and space-tunable Au/Al<SUB>2</SUB>O<SUB>3</SUB> nanocomposite film. This study indicates that the Au/Al<SUB>2</SUB>O<SUB>3</SUB> nanocomposite film is very promising; it simultaneously overcomes the instability and uncontrollable interparticle distance, which are the current bottlenecks hampering the application of SPR sensors. <img src='wiley_img/1616301X-2010-20-1-ADFM200901232-content.gif' alt='wiley_img/1616301X-2010-20-1-ADFM200901232-content'> </P>
Yasuyuki Nakamura,Daisuke Hokuto,Fumikazu Koyama,Yasuko Matsuo,Takeo Nomi,Takahiro Yoshikawa,Naoki Kamitani,Tomomi Sadamitsu,Takeshi Takei,Yayoi Matsumoto,Yosuke Iwasa,Kohei Fukuoka,Shinsaku Obara,Tak 대한대장항문학회 2021 Annals of Coloproctolgy Vol.37 No.5
Purpose: Primary tumor location of colon cancer has been reported to affect the prognosis after curative resection. However, some reports suggested the impact was varied by tumor stage. This study analyzed the prognostic impact of the sidedness of colon cancer in stages II, III, and liver metastasis after curative resection using propensity-matched analysis.Methods: Right-sided colon cancer was defined as a tumor located from cecum to splenic flexure, while any more distal colon cancer was defined as left-sided colon cancer. Patients who underwent curative resection at Nara Medical University hospital between 2000 and 2016 were analyzed.Results: There were 110 patients with stage II, 100 patients with stage III, and 106 patients with liver metastasis. After propensity matching, 28 pairs with stage II and 32 pairs with stage III were identified. In the patients with stage II, overall survival (OS) and recurrence-free survival (RFS) were not significantly different for right- and left-sided colon cancers. In the patients with stage III, OS and RFS were significantly worse in right-sided colon cancer. In those with liver metastasis, OS of right-sided colon cancer was significantly worse than left-sided disease, while RFS was similar. Regarding metachronous liver metastasis, the difference was observed only in the patients whose primary colon cancer was stage III. In each stage, significantly higher rate of peritoneal recurrence was found in those with right-sided colon cancer.Conclusion: Sidedness of colon cancer had a significant and varied prognostic impact in patients with stage II, III, and liver metastasis after curative resection.