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Evidence for structural phase transitions and large effective band gaps in quasi-metallic ultra-clean suspended carbon nanotubes

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Nano Research 2013年第10期6卷 736-744页

作者： Shun-Wen Chang Rohan Dhall Moh Amer kentaro sato Riichiro Saito Stephen Cronin Department of Physics and Astronomy University of Southern California Los Angeles CA 90089 USA Department of Electrical Engineering University of Southern California Los Angeles CA 90089 USA Department of Chemistry University of Southern California Los Angeles CA 90089 USA Department of Physics Tohoku University Sendai 980-8578 Japan

We report evidence for a structural phase transition in individual suspended metallic carbon nanotubes by examining their Raman spectra and electron trans- port under electrostatic gate potentials. The current-gate voltage characteristics reveal anomalously large quasi-metallic band gaps as high as 240 meV, the largest reported to date. For nanotubes with band gaps larger than 200 meV, we observe a pronounced M-shape profile in the gate dependence of the 2D band （or G＇ band） Raman frequency. The pronounced dip （or softening） of the phonon mode near zero gate voltage can be attributed to a structural phase transition （SPT） that occurs at the charge neutrality point （CNP）. The 2D band Raman intensity also changes abruptly near the CNP, providing further evidence for a change in the lattice symmetry and a possible SPT. Pronounced non-adiabatic effects are observed in the gate dependence of the G band Raman mode, however, this behavior deviates from non-adiabatic theory near the CNP. For nanotubes with band gaps larger than 200 meV, non-adiabatic effects should be largely suppressed, which is not observed experimentally. This data suggests that these large effective band gaps are primarily caused by a SPT to an insulating state, which causes the large modulation observed in the conductance around the CNP. Possible mechanisms for this SPT are discussed, including electron-electron （e.g., Mott） and electron-phonon （e.g., Peierls） driven transitions.

关键词： carbon nanotube Raman spectroscopy phase transition bandgap energy

Percutaneous endoscopic necrosectomy for walled-off necrosis in the retroperitoneal space of the elderly:A case report

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World Journal of Clinical Cases 2023年第24期11卷 5736-5741页

作者： kentaro sato Goro Shibukawa Kenta Ueda Yuki Nakajima Kazutomo Togashi Hiromasa Ohira Department of Gastroenterology Aizu Medical Center Fukushima Medical UniversityAizuwakamatsu 969-3492FukushimaJapan Department of Gastroenterology Fukushima Medical University School of MedicineFukushima 960-1295FukushimaJapan

BACKGROUND Walled-off necrosis(WON)is a late complication of acute pancreatitis possibly with a fatal *** for WON spreading to the retroperitoneal space,percutaneous endoscopic necrosectomy(PEN)can be an alternate approach to surgical necrosectomy,particularly for the older individuals or patients with poor condition because of *** SUMMARY An 88-year-old man was admitted to our hospital with a *** retrograde cholangiopancreatography(ERCP)was performed to improve jaundice;however,post-ERCP pancreatitis *** inflammation of pancreatitis spread widely from the right retroperitoneal cavity to the pelvis,and WON was formed 4 wk later.A percutaneous drainage tube was placed into the WON under computed tomography ***,the drainage did not ameliorate clinical symptoms including fever,which assured less invasive necrosectomy.A metallic stent for the upper gastrointestinal(GI)tract was placed from the percutaneous drainage *** upper GI endoscope was inserted into the inside of the WON through the metallic stent,and the necrotic tissues were bluntly removed with a snare *** times of these necrosectomies resulted in the near-complete removal of necrotic *** procedures consequently abated his fever and remarkable improvement in blood *** PEN for WON occurring in the retroperitoneal space was safe and effective for very old individuals.

关键词： Walled-off necrosis Percutaneous drainage Endoscopic necrosectomy Post endoscopic retrograde cholangiopancreatography pancreatitis Elderly Case report

Molecular Functions of Oxygen-Evolving Complex Family Proteins in Photosynthetic Electron Flow

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Journal of Integrative Plant Biology 2010年第8期52卷 723-734页

作者： kentaro Ifuku Seiko Ishihara Fumihiko sato Graduate School of Biostudies Kyoto University

Oxygen-evolving complex （OEC） protein is the original name for membrane-peripheral subunits of photosystem （PS） II. Recently, multiple isoforms and homologs for OEC proteins have been iden- tified in the chloroplast thylakoid lumen, indicating that functional diversification has occurred in the OEC family. Gene expression profiles suggest that the Arabidopsis OEC proteins are roughly categorized into three groups： the authentic OEC group, the stressresponsive group, and the group including proteins related to the chloroplast NAD（P）H dehydrogenase （NDH） complex involved in cyclic electron transport around PSI. Based on the above gene expression profiles, molecular functions of the OEC family proteins are discussed together with our current knowledge about their functions.

关键词： NDH Molecular Functions of Oxygen-Evolving Complex Family Proteins in Photosynthetic Electron Flow OEC PSII PPL

Zircon SHRIMP U-Pb dating on plagiogranite from Kuerti ophiolite in Altay,North Xinjiang

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Chinese Science Bulletin 2003年第20期48卷 2231-2235页

作者： ZHANG Haixiang NIU Hecai kentaro Terada YU Xueyuan Hiroaki sato Jun抜chi Ito Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Graduate School of Science Hiroshima University Higashi-Hiroshima 739-8526 Japan Graduate School of Science and Technology Kobe University Kobe 657-8501 Japan

Field observation, petrological and geochemical characteristics of plagiogranite from Kuerti ophiolite indicate a similar origin to those in shearing zones. It isderived from partial melting of amphibolite that is developed from gabbro within the ocean layer 3 shear zone by the low-angle shearing deformation during the oceanic crustmigrating process. Zircon SHRIMP age of 372±19 Ma for the plagioganite from Kuerti ophiolite indicates that thisophiolite formed in the Devonian period and it alsorepresented the time of extension of the Kuerti backarc basin that is relevant to the northwards subduction of thePaleo-Asian oceanic crust. Therefore, the northwardssubduction of the Paleo-Asian Ocean beneath the Siberian Plate began in the early stage of the Late Paleozoic era.

关键词：新疆北部斜长花岗岩蛇绿岩锆石U-Pb测年古生代

Cytapheresis for pyoderma gangrenosum associated with inflammatory bowel disease:A review of current status

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World Journal of Clinical Cases 2020年第11期8卷 2092-2101页

作者： kentaro Tominaga Kenya Kamimura Hiroki sato Masayoshi Ko Yuzo Kawata Takeshi Mizusawa Junji Yokoyama Shuji Terai Division of Gastroenterology and Hepatology Graduate School of Medical and Dental SciencesNiigata UniversityNiigata 951-8510Japan

Pyoderma gangrenosum(PG)is a neutrophilic dermatosis clinically characterized by the presence of painful skin ulcerations with *** it is frequently associated with inflammatory bowel diseases,including ulcerative colitis,gastroenterologists should be familiar with the disease including therapeutic ***,we have conducted a review focusing on the cytapheresis for PG in cases of inflammatory bowel diseases.A literature search was conducted to extract studies published in the last 20 years,with information on demographics,clinical symptoms,treatment,and the clinical course from a total of 22 cases reported and our recent *** most patients,cytapheresis was associated with improvement or resolution of PG after failure of conventional therapeutic options such as corticosteroids,antibiotics,immunosuppressive agents and *** on the information summarized,cytapheresis is helpful in the majority of patients with PG refractory to medical treatment associated with inflammatory bowel diseases and could be further studied in a multicenter,randomized trial.

关键词： Granulocytapheresis Leucocytapheresis Cytapheresis Inflammatory bowel diseases Pyoderma gangrenosum Complications

Internal Microanatomy and Zoological Affinity of the Early Cambrian Olivooides

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Acta Geologica Sinica(English Edition) 2016年第1期90卷 38-65页

作者： Han Jian LI Guoxiang KUBOTA Shin OU Qiang TOSHINO Sho WANG Xing YANG Xiaoguang UESUGI kentaro MAsato Hoshino SASAKI Osamu KANO Harumasa sato Tomohiko KOMIYA Tsuyoshi Early Life Institute and Department of Geology and State Key Laboratory of Continental Dynamics Northwest University229 Taibai RoadXi'an 710069China State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing 210008China Seto Marine Biological Laboratory Field Science Education and Research CenterKyoto UniversityShirahamaNishimuroWakayama 649-2211Japan Early Life Evolution Laboratory School of Earth Sciences and ResourcesChina.University of GeosciencesBeijing 100083China Graduate School of Fisheries Sciences Kitasato University1-15-1 KitasatoSagamiharaKanagawa 252-0373Japan Japan Synchrotron Radiation Research Institute(JASRI)1-1-1 Kouto Sayo-choSayo-gunHyogoJapan Tohoku University Museum Tohoku University6-3 AobaAramakiAoba-kuSendaiJapan Department of Earth Science and Astronomy Graduate School of Arts and SciencesThe University of TokyoTokyo 153-8902Japan

The early Cambrian pentamerous microfossil Olivooides/Punctatus in South China, which is characterized by a diagnostic stellate tubular apex, has been well-known for its almost complete development sequence that can be confidently traced from embryos and hatched juveniles, to conical adults. However, its zoological affinity remains highly controversial. Here we describe the internal microanatomic structures of the soft-body inside the peridermal theca of Olivooides multisulcatus Qian, 1977, including interradial pairs of tentacles, adradial and perradial frenula, perradial oral marginal lappets and twins of perradial gastric saccule-like humps as well as a circular velarium with striated coronal muscles. Particularly, one specimen shows bifurcated velarial canals along the bell aperture. Both the components of the soft-body and the external theca （or cyst） are arranged in perfect pentaradial symmetry. These characteristics are more compatible with those of living cubomedusans and co-occurring Cambrian athecate embryonic cubozoans. Concerning the presence of peridermal theca, Olivooides most likely represents an extinct thecate stem-group cubomedusae but devoid of both perradial eyes and specialized pedalia. The well-grown soft body inside the peridermal tube displays a set of mixed features of both polyp and medusa.

关键词： Embryos periderm cnidarians cubozoan early Cambrian Kuanchuanpu Formation

Real-world efficacy and safety of tofacitinib treatment in Asian patients with ulcerative colitis

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World Journal of Gastroenterology 2024年第13期30卷 1871-1886页

作者： kentaro Kojima Kenji Watanabe Mikio Kawai Soichi Yagi Koji Kaku Maiko Ikenouchi Toshiyuki sato Koji Kamikozuru Yoko Yokoyama Tetsuya Takagawa Masahito Shimizu Shinichiro Shinzaki Department of Gastroenterology Hyogo Medical UniversityNishinomiya 663-8501Japan Department of Gastroenterology Gifu University Graduate School of MedicineGifu 501-1194Japan Department of Internal Medicine for Inflammatory Bowel Disease The University of ToyamaToyama 930-0194Japan Center for Clinical Research and Education Hyogo Medical UniversityNishinomiya 663-8501Japan

BACKGROUND Real-world data on tofacitinib(TOF)covering a period of more than 1 year for a sufficient number of Asian patients with ulcerative colitis(UC)are *** To investigate the long-term efficacy and safety of TOF treatment for UC,including clinical *** We performed a retrospective single-center observational analysis of 111 UC patients administered TOF at Hyogo Medical University as a tertiary inflammatory bowel disease *** consecutive UC patients who received TOF between May 2018 and February 2020 were *** were followed up until August *** primary outcome was the clinical response rate at week *** outcomes included clinical remission at week 8,cumulative persistence rate of TOF administration,colectomy-free survival,relapse after tapering of TOF and predictors of clinical response at week 8 and week *** The clinical response and remission rates were 66.3%and 50.5%at week 8,and 47.1%and 43.5%at week 48,*** overall cumulative clinical remission rate was 61.7%at week 48 and history of anti-tumor necrosis factor-alpha(TNF-α)agents use had no influence(P=0.25).The cumulative TOF persistence rate at week 48 was significantly lower in patients without clinical remission than in those with remission at week 8(30.9%vs 88.1%;P<0.001).Baseline partial Mayo Score was significantly lower in responders vs non-responders at week 8(odds ratio:0.61,95%confidence interval:0.45-0.82,P=0.001).Relapse occurred in 45.7%of patients after TOF tapering,and 85.7%of patients responded within 4 wk after *** 6 patients with herpes zoster(HZ)developed the infection after achieving remission by *** TOF was more effective in UC patients with mild activity at baseline and its efficacy was not affected by previous treatment with anti-TNF-α*** relapsed patients responded again after re-increase of TOF and nearly half relapsed after tapering off *** attention is needed for tapering and H

关键词： Ulcerative colitis Tofacitinib Janus kinase inhibitor Real-world Biologics

Clinical outcomes of enteroscopy using the double-balloon method for strictures of the small intestine

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World Journal of Gastroenterology 2005年第7期11卷 1087-1089页

作者： Keijiro Sunada Hironori Yamamoto Hiroto Kita Tomonori Yano Hiroyuki sato Yoshikazu Hayashi Tomohiko Miyata Yutaka Sekine Akiko Kuno Michiko Iwamoto Hirohide Ohnishi Kenichi Ido kentaro Sugano Department of Internal Medicine

AIM:To evaluate the clinical outcome of enteroscopy, using the double-balloon method, focusing on the involvement of neoplasms in strictures of the small intestine. METHODS: Enteroscopy, using the double-balloon method, was performed between December 1999 and December 2002 at Jichi Medical School Hospital, 3apan and strictures of the small intestine were found in 17 out of 62 patients. These 17 consecutive patients were subjected to analysis. RESULTS: The double-balloon enteroscopy contributed to the diagnosis of small intestinal neoplasms found in 3 out of 17 patients by direct observation of the strictures as well as biopsy sampling. Surgical procedures were chosen for these three patients, while balloon dilation was chosen for the strictures in four patients diagnosed with inflammation without involvement of neoplasm. CONCLUSION: Double-balloon enteroscopy is a useful method for the diagnosis and treatment of strictures in the small bowel.

关键词： Double-balloon enteroscopy Strictures Small intestine

Efficacy of tolvaptan in patients with refractory ascites in a clinical setting

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World Journal of Hepatology 2015年第12期7卷 1685-1693页

作者： Takamasa Ohki Koki sato Tomoharu Yamada Mari Yamagami Daisaku Ito Koki Kawanishi kentaro Kojima Michiharu Seki Nobuo Toda Kazumi Tagawa Department of Gastroenterology Mitsui Memorial Hospital

AIM: To elucidate the efficacies of tolvaptan(TLV) as a treatment for refractory ascites compared with conventional treatment. METHODS: We retrospectively enrolled 120 refractory ascites patients between January 1, 2009 and September 31, 2014. Sixty patients were treated with oral TLV at a starting dose of 3.75 mg/d in addition to sodium restriction(> 7 g/d), albumin infusion(10-20 g/wk), and standard diuretic therapy(20-60 mg/d furosemide and 25-50 mg/d spironolactone) and 60 patients with large volume paracentesis in addition to sodium restriction(less than 7 g/d), albumin infusion(10-20 g/wk), and standard diuretic therapy(20-120 mg/d furosemide and 25-150 mg/d spironolactone). Patient demographics and laboratory data, including liver function, were not matched due to the small number of patients. Continuous variables were analyzed by unpaired t-test or paired t-test. Fisher's exact test was applied in cases comparing two nominal variables. We analyzed factors affecting clinical outcomes using receiver operating characteristic curves and multivariate regression analysis. We also used multivariate Cox's proportional hazard regression analysis to elucidate the risk factors that contributed to the increased incidence of ***: TLV was effective in 38(63.3%) patients. The best cut-off values for urine output and reduced urine osmolality as measures of refractory ascites improvement were > 1800 mL within the first 24 h and > 30%, respectively. Multivariate regression analysis indicated that > 25% reduced urine osmolality [odds ratio(OR) = 20.7; P < 0.01] and positive hepatitis C viral antibodies(OR = 5.93; P = 0.05) were positively correlated with an improvement of refractory ascites, while the total bilirubin level per 1.0 mg/dL(OR = 0.57;P = 0.02) was negatively correlated with improvement. In comparing the TLV group and controls, only the serum sodium level was significantly lower in the TLV group(133 mE q/L vs 136 mE q/L; P = 0.02). However, there were n

关键词： Refractory ascites Tolvaptan Paracentesis Decompensated cirrhosis