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Contracted interlayer distance in graphene/sapphire heterostructure

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Nano Research 2015年第5期8卷 1535-1545页

作者： Shiro Entani Liubov Yu. Antipina Pavel V. Avramov Manabu Ohtomo Yoshihiro Matsumoto Norie Hirao Iwao Shimoyama Hiroshi Naramoto yuji baba Pavel B. Sorokin Seiji Sakai Advanced Science Research Center Japan Atomic Energy Agency Tokai Ibaraki 319-1195 Japan Technological Institute for Superhard and Novel Carbon Materials Troitsk Moscow 142190 Russia Moscow Institute of Physics and Technology Dolgoprudny Moscow 141700 Russia Siberian Federal University 79 Svobodniy pr. Krasnoyarsk 660041 Russia Ouantum Beam Science Directorate Japan Atomic Energy Agency Tokai Ibaraki 319-1195 Japan National University of Science and Technology MISiS Moscow 119049 Russia

Direct growth of graphene on insulators is expected to yield significant improvements in performance of graphene-based electronic and spintronic devices. In this study, we successfully reveal the atomic arrangement and electronic properties of a coherent heterostructure of single-layer graphene and α-Al2O3（0001）. The analysis of the atomic arrangement of single-layer graphene on α-Al2O3（0001） revealed an apparentcontradiction. The in-plane analysis shows that single-layer graphene grows not in a single-crystalline epitaxial manner, but rather in polycrystalline form, with two strongly pronounced preferred orientations. This suggests relatively weak interfacial interactions are operative. However, we demonstrate that unusually strong physical interactions between graphene and α-Al2O3（0001） exist, as evidenced by the small separation between the graphene and the α-Al2O3（0001） surface. The interfacial interaction is shown to be dominated by the electrostatic forces involved in the graphene n-system and the unsaturated electrons of the topmost O layer of α-Al2O3（0001）, rather than the van der Waals interactions. Such features causes graphene hole doping and enable the graphene to slide on the α-Al2O3（0001） surface with only a small energy barrier despite the strong interfacial interactions.

关键词： graphene sapphire chemical vapor deposition graphene/insulator interface

Synthesis of Hexagonal Boron Carbonitride without Nitrogen Void Defects

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Materials Sciences and Applications 2015年第5期6卷 353-359页

作者： Md. Abdul Mannan yuji baba Tetsuya Kida Masamitsu Nagano Hideyuki Noguchi Department of Chemistry University of Rajshahi Rajshahi Bangladesh Synchrotron Radiation Research Unit Quantum Beam Science Directorate Japan Atomic Energy Agency Ibaraki-ken Japan Sector of Fukushima Research and Development Japan Atomic Energy Agency Fukushima-shi Japan Department of Chemistry and Applied Chemistry Saga University Honjyo Japan

The synthesis and structure of hexagonal boron carbonitride (h-BCN) film on polycrystalline diamond surface were reported. Polycrystalline diamond and/or diamond-like carbon were first fabricated on Si (100) and then diamond like carbon was used as substrate. The deposition was performed by radio frequency plasma enhanced chemical vapor deposition. In order to reduce the content of nitrogen void defects, the deposition was performed at the high temperature of 950°C under the working pressure of 2.6 Pa. The typical sample with atomic composition of B31 C37 N26 O6 in the h-BCN lattice was characterized by X-ray photoelectron spectroscopy. The fine structure of the film was studied by near-edge X-ray absorption fine structure (NEXAFS) measurements. The B K-edge and N K-edge of NEXAFS spectra revealed that the synthesized h-BCN film had the ideal honeycomb- like BN3 configuration without nitrogen void defects.

关键词： h-BCN Defect Chemical Vapor Deposition XPS NEXAFS

Hexagonal Nano-Crystalline BCN Films Grown on Si (100) Substrate Studied by X-Ray Absorption Spectroscopy

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Materials Sciences and Applications 2013年第5期4卷 11-19页

作者： Md. Abdul Mannan yuji baba Norie Hirao Tetsuya Kida Masamitsu Nagano Hideyuki Noguchi Department of Chemistry and Applied Chemistry Faculty of Science and Engineering Saga University Saga Japan Department of Chemistry and Applied Chemistry Faculty of Science and Engineering Saga University Saga Japan Synchrotron Radiation Research Unit Quantum Beam Science Directorate Japan Atomic Energy Agency Ibaraki Japan Synchrotron Radiation Research Unit Quantum Beam Science Directorate Japan Atomic Energy Agency Ibaraki Japan

Hexagonal nano-crystalline boron carbonitride (h-BCN) films grown on Si (100) substrate have been precisely investigated. The films were synthesized by radio frequency plasma enhanced chemical vapor deposition using tris-dimethylamino borane as a single-source molecular precursor. The deposition was performed by setting RF power at 400 - 800 W. The reaction pressure was at 2.6 Pa and the substrate temperature was recorded at 700°C - 800°C. Formation of the nano-crystalline h-BCN compound has been confirmed by X-ray diffraction analysis. The diffraction peaks at 26.3° together with a small unknown peak at 29.2° were elucidated due to the formation of an h-BCN structure. The films composed of B, C, and N atoms with different B-N, B-C, C-N chemical bonds in forming the sp2-BCN atomic configuration studied by X-ray photoelectron spectroscopy. Orientation and local structures of the h-BCN hybrid were studied by near-edge X-ray absorption fine structure (NEXAFS) measurements. The dominant presence of p* and s* resonance peaks of the sp2-hybrid orbitals in the B K-edge NEXAFS spectra revealed the formation of the sp2-BCN configuration around B atoms like-BN3 in h-BN. The orientation was suggested on the basis of the polarization dependence of B K-edge and N K-edge of the NEXAFS spectra.

关键词： Nano-Crystalline h-BCN Films Synchrotron Radiation XPS NEXAFS Orientation

Selective extraction of In(Ⅲ),Ga(Ⅲ) and Zn(Ⅱ) using a novel extractant with phenylphosphinic acid

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Chinese Journal of Chemical Engineering 2016年第2期24卷 232-236页

作者： yuji Sasaki Naoki Matsuo Tatsuya Oshima Yoshinari baba Department of Applied Chemistry Faculty of EngineeringUniversity of Miyazaki

A new extractant, [N,N-di（2-ethylhexyl）aminolmethylphenylphosphinic acid （DEAPP）, was synthesized to de- velop the mutual separation techniques of In（Ⅲ）, Ga（Ⅲ） and Zn（Ⅱ）. The extraction selectivity for In（Ⅲ）, Ga（Ⅲ） and Zn（Ⅱ） with DEAPP was higher than that of the commercial phosphorus acid extractants such as D2EHPA and PC-88A. The extraction selectivity for metal ions in 1 mob L 1 aqueous ammonium nitrate solution with DEAPP was in the following order： In（Ⅲ）〉 Ga（Ⅲ）〉 Zn（Ⅱ）. These selective extraction behaviors indicate that the amino moiety of DEAPP plays an important role in the mutual separation of ln（Ⅲ）, Ga（Ⅲ） and Zn（ll）. The extraction equilibria of In（Ⅲ）, Ga（Ⅲ） and Zn（Ⅱ） with DEAPP （ = HR） were expressed by the following reactions： In3＋＋ 2（HR）2 InR3（HR）＋ 3H＋, Ga3＋＋ 1.5（HR）2 ＋ N- = GaR2（HR）（NO3）＋ 2H＋, and Zn2＋ 4- 2（HR）2 ZnR2 （HR） 2 determined 4- 2H＋. The extraction equilibrium constants of In（Ⅲ）, Ga（Ⅲ） and Zn（Ⅱ） with DEAPP were to be Kex, M = 1.7 × 104 [*** 1], 4.17 [（***-1）s], and 1.55 × 10 2 [-], respectively.

关键词： Liquid-liquid extraction Phosphinic acid Indium(Ⅲ) Gallium(Ⅲ) Zinc(Ⅱ) Mutual separation Extraction equilibrium

Molecular insights into colorectal cancer stem cell regulation by environmental factors

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Journal of Cancer Metastasis and Treatment 2015年第1期1卷 156-162页

作者： Daisuke Izumi Takatsugu Ishimoto Yasuo Sakamoto yuji Miyamoto Hideo baba Department of Gastroenterological Surgery Graduate School of Medical ScienceKumamoto University1-1-1 HonjoKumamoto 860-8556Japan Cancer and Stem Cell Biology Duke-NUS Graduate Medical School Singapore169857 Singapore.

Colorectal cancer remains a signifi cant cause of cancer-related mortality worldwide,mainly because of tumor relapse and *** stem cells(CSCs)are considered to be the main cause of resistance to chemotherapeutic agents,as well as being responsible for distant *** CSCs themselves possess innate abilities for self-renewal and differentiation,the environment surrounding CSCs provides oxygen,nutrients and secreted factors,and also supports angiogenesis,thus it's responsible for maintaining their CSC ***,extensive investigations have revealed that obesity,accompanied by excess visceral adipose tissue,induces chronic infl ammation,and is linked to the risk and progression of several gastrointestinal cancers,through modulating the capacities of the *** review presents the evidence linking colorectal CSCs and their environment and summarizes our current understanding of the molecular mechanisms underlying this relationship.

关键词： Cancer stem cells markers colorectal cancer stem cell nutrient obesity tumor microenvironment

Successful treatment of conversion chemotherapy for initially unresectable synchronous colorectal liver metastasis

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World Journal of Gastroenterology 2015年第6期21卷 1982-1988页

作者： Kenta baba Akihiko Oshita Mohei Kohyama Satoshi Inoue Yuta Kuroo Takuro Yamaguchi Hiroyuki Nakamura Yoichi Sugiyama Tatsuya Tazaki Masaru Sasaki yuji Imamura Yutaka Daimaru Hideki Ohdan Atsushi Nakamitsu Department of Surgery JA Hiroshima General Hospital Department of Gastroenterological and Transplant Surgery Applied Life Sciences Institute of Biomedical and Health Sciences Hiroshima University Department of Pathology JA Hiroshima General Hospital

A 72-year-old woman with a sigmoid colon cancer and a synchronous colorectal liver metastasis(CRLM),which involved the right hepatic vein(RHV)and the inferior vena cava(IVC),was referred to our *** metastatic lesion was diagnosed as initially unresectable because of its invasion into the confluence of the RHV and *** she had undergone laparoscopic sigmoidectomy for the original tumor,she consequently had 3 courses of modified 5-fluorouracil,leucovorin,and oxaliplatin(m FOLFOX6)plus *** tomography revealed a partial response,and the confluence of the RHV and IVC got free from cancer *** 3 additional courses of m FOLFOX6 plus cetuximab,preoperative percutaneous transhepatic portal vein embolization(PTPE)was performed to secure the future remnant liver ***,a right hemihepatectomy was *** postoperative course was *** patient was discharged from the hospital on postoperative day *** had neither local recurrence nor distant metastasis 18 mo after the last surgical *** multidisciplinary strategy,consisting of conversion chemotherapy using FOLFOX plus cetuximab and PTPE,could contribute in facilitating curative hepatic resection for initially unresectable CRLM.

关键词： Initial y unresectable Colorectal liver metastasis

Circulating tumor cells in gastric cancer

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Journal of Cancer Metastasis and Treatment 2018年第1期4卷 380-390页

作者： Kenichi Nakamura Masaaki Iwatsuki Junji Kurashige Takatsugu Ishimoto Yoshifumi baba yuji Miyamoto Naoya Yoshida Masayuki Watanabe Hideo baba Division of Gastric Surgery Shizuoka Cancer CenterShizuoka 411-8777Japan Department of Gastroenterological Surgery Graduate School of Medical SciencesKumamoto UniversityKumamoto 860-8556Japan Esophageal Cancer Division Gastroenterological SurgeryCancer Institute Hospital of Japanese Foundation for Cancer ResearchTokyo 135-8550Japan

Circulating tumor cells(CTCs)have received a lot of attention as a novel biomarker for cancer research in past *** infiltrate the bloodstream derived from the primary tumor,and are significantly involved in cancer metastasis and *** clinical applications have been challenging owing to the difficulties of CTC identification,recent development of technology for specific enrichment and detection of CTCs contributes to diagnosis and ***,CTC analyses will shed new light on the biological mechanisms of cancer progression and metastasis.A number of clinical studies have already been carried out on the basis of CTC ***,the clinical utility of CTCs is still unknown in gastric *** this review,we elaborate on the latest advances of CTC research in gastric cancer.

关键词： Circulating tumor cells gastric cancer cancer progression and metastasis tumor heterogeneity epithelial mesenchymal transition cancer stem cells immune check point blockade

The clinical signifi cance of circulating tumor cells in gastrointestinal cancer

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Journal of Cancer Metastasis and Treatment 2015年第1期1卷 130-137页

作者： Masaaki Iwatsuki Junji Kurashige Takatsugu Ishimoto Keisuke Kosumi Yoshifumi baba Yasuo Sakamoto yuji Miyamoto Naoya Yoshida Masayuki Watanabe Hideo baba Department of Gastroenterological Surgery Graduate School of Medical SciencesKumamoto University1-1-1 HonjoChuo-kuKumamoto 860-8556Japan Department of Gastroenterological Surgery Esophageal Cancer DivisionCancer Institute Hospital of Japanese Foundation for Cancer Research3-8-31 AriakeKoto-kuTokyo 135-8550Japan

Circulating tumor cells(CTCs)are originated from the primary tumor lesion into the blood *** could lead to recurrence of gastrointestinal(GI)cancers,even after a curative resection and colonizing in the distant organs to facilitate tumor distant metastasis;however,it has been challenging in clinic to detect CTCs for a long time,such as detection methodology or molecular markers for identifi cation of *** review discussed the recent technical advances and biomarkers in the detection of CTCs and the molecular mechanism of CTC in cancer progression and ***,novel concepts,such as cancer stem cells and epithelial-mesenchymal transition,could lead to CTCs and tumor progression and ***,the involvement of CTCs varies greatly among cancer types in the GI and much remains to be ***,further study will provide more insightful information from a clinical and translational viewpoint to use CTCs for cancer early diagnosis or prediction of tumor recurrence and investigation of tumor progression and metastasis as well.

关键词： Cancer stem cells circulating tumor cells epithelial-mesenchymal transition gastrointestinal cancer tumor progression and metastasis

Self-expanding metal stent placement and pathological alterations among obstructive colorectal cancer cases

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World Journal of Gastrointestinal Endoscopy 2022年第11期14卷 704-717页

作者： Keisuke Kosumi Kosuke Mima Kosuke Kanemitsu Takuya Tajiri Toru Takematsu Yuki Sakamoto Mitsuhiro Inoue yuji Miyamoto Takao Mizumoto Tatsuo Kubota Nobutomo Miyanari Hideo baba Department of Gastroenterological Surgery Kumamoto UniversityKumamoto 860-8556Japan Department of Surgery National Hospital Organization Kumamoto Medical CenterKumamoto 860-0008Japan Department of Gastroenterological Surgery Graduate School of Medical SciencesKumamoto UniversityHonjo 860-8556KumamotoJapan

BACKGROUND Experimental studies suggest that self-expanding metal stents(SEMSs)enhance the aggressive behavior of obstructive colorectal *** influence of SEMS placement on pathological alterations remains to be *** To determine whether SEMS placement is associated with molecular or pathological features of colorectal carcinoma *** Using a nonbiased molecular pathological epidemiology database of patients with obstructive colorectal cancers,we examined the association of SEMS placement with molecular or pathological features,including tumor size,histological type,American Joint Committee on Cancer(AJCC)-pTNM stage,and mutation statuses in colorectal cancer tissues compared with the use of transanal tubes.A multivariable logistic regression model was used to adjust for potential *** SEMS placement was significantly associated with venous invasion(P<0.01),but not with the other features examined,including tumor size,disease stage,mutation status,and lymphatic *** both the univariable and multivariable models with adjustment for potential factors including tumor location,histological type,and AJCC-pT stage,SEMS placement was significantly associated with severe venous invasion(P<0.01).For the outcome category of severe venous invasion,the multivariable odds ratio for SEMS placement relative to transanal tube placement was 19.4(95%confidence interval:5.24–96.2).No significant differences of disease-free survival and overall survival were observed between SEMS and transanal tube *** SEMS placement might be associated with severe venous invasion in colorectal cancer tissue,providing an impetus for further investigations on the pathological alterations by SEMSs in colorectal cancer development.

关键词： Bridge to surgery Colorectal carcinoma Obstruction Stent Venous invasion