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Carbon nanotube-dependent synthesis of armchair graphene nanoribbons

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Nano Research 2022年第3期15卷 1709-1714页

作者： Yifan Zhang Kecheng Cao takeshi saito Hiromichi Kataura Hans Kuzmany Thomas Pichler Ute Kaiser Guowei Yang Lei Shi State Key Laboratory of Optoelectronic Materials and Technologies Nanotechnology Research CenterGuangzhou Key Laboratory of Flexible Electronic Materials and Wearable DevicesSchool of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China Central Facility for Electron Microscopy Electron Microscopy Group of Materials ScienceUlm UniversityUlm 89081Germany School of Physical Science and Technology Shanghai Tech UniversityShanghai 201210China Nanomaterials Research Institute National Institute of Advanced Industrial Science and TechnologyTsukuba 305-8565Japan Faculty of Physics University of ViennaVienna 1090-AAustria

Sub-nanometer armchair graphene nanoribbons(GNRs)with moderate band gap have great potential towards novel *** can be synthesized in the confined tubular space of single-walled carbon nanotubes(SWCNTs),in which precursor molecules have been specifically designed to form the GNRs with certain width and ***,it is still unexplored how the diameter and metallicity of SWCNTs influence the synthesis of the ***,we applied a series of SWCNTs with different average diameters to study the diameter-dependent synthesis of *** using Raman spectroscopy and transmission electron microscopy,we found that the width of the GNRs can be tailored by the diameter of the ***,the SWCNTs with average diameter of 1.3 nm produced 6 and 7 armchair GNRs with the highest yield,which can be well explained by considering the width of the GNRs and van der Waals radius of hydrogen and carbon *** addition,semiconducting and metallic SWCNTs produced GNRs with different yields,which could attribute to different diameter distributions and density of *** results enable the possibility of a high-yield production of certain armchair graphene nanoribbons in large scale,which would benefit future applications as semiconductor with sub-nanometer in width.

关键词： armchair graphene nanoribbons single-walled carbon nanotubes Raman spectroscopy diameter dependence metallicity dependence

Isolated arterioportal fistula presenting with variceal hemorrhage

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World Journal of Gastroenterology 2013年第17期19卷 2714-2717页

作者： Anupama Nookala Behnam Saberi Ramon Ter-Oganesyan Gary Kanel Phillip Duong takeshi saito Division of Gastroenterology and Liver Diseases Department of Medicine University of Southern California Los Angeles Department of Radiology University of Southern California Department of Pathology University of Southern California

We report a case of life-threatening hematemesis due to portal hypertension caused by an isolated arterioportal fistula (APF). Intrahepatic APFs are extremely rare and are a cause of presinusoidal portal hypertension. Etiologies for APFs are comprised of precipitating trauma, malignancy, and hereditary hemorrhagic telangiectasia, but these were not the case in our patient. Idiopathic APFs are usually due to congenital vascular abnormalities and thus usually present in the pediatric setting. This is one of the first cases of adult-onset isolated APF who presented with portal hypertension and was successfully managed through endoscopic hemostasis and subsequent interventional radiological embolization.

关键词： Arterioportal fistula Presinusoidal portal hypertension Hepatic vein pressure gradient Hepatic artery embolization

High Yield Synthesis and Characterization of the Structural and Magnetic Properties of Crystalline ErCl_(3) Nanowires in Single-Walled Carbon Nanotube Templates

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Nano Research 2008年第2期1卷 152-157页

作者： Ryo Kitaura Daisuke Ogawa keita Kobayashi takeshi saito Satoshi Ohshima Tetsuya Nakamura Hirofumi Yoshikawa Kunio Awaga Hisanori Shinohara Department of Chemistry and Institute for Advanced Research Graduate School of ScienceNagoya UniversityNagoya 464-8602Japan Nanotube Research Center National Institute of Advanced Industrial Science and TechnologyTsukuba 305-8565Japan PRESTO JapanScience and Technology Agency4-1-8 Honcho kawaguchiSaitama 332-0012Japan Japan Synchrotron Radiation Research Institute Hyogo 679-5198Japan

Crystalline ErCl_(3) nanowires have been fabricated in single-walled carbon nanotubes(SWCNTs)with high yield(~90%),and the structural and magnetic properties of the resulting ErCl_(3) nanowires encapsulated in SWCNTs(ErCl_(3)@SWCNTs)*** under high temperature and vacuum using high quality SWCNTs results in a high fi lling-ratio of ErCl_(3) nanowires in the *** high fi lling-ratio of ErCl_(3) nanowires and the use of highly pure SWCNTs with only a small amount of residual Fe catalyst nanoparticles enabled us to observe the magnetic properties of ErCl_(3)@*** determination based on simulated annealing calculations and high-resolution transmission electron microscope(HRTEM)image simulations revealed that the structure of the ErCl_(3) nanowires is unusual with respect to the coordination environment of the Eu3+*** work opens up new possibilities to fabricate various metal complex nanowires with high yield and may also be of more general importance in understanding and exploring magnetic properties in low-dimensional magnetic systems.

关键词： Low-dimensional nanomaterials carbon nanotubes magnetic properties crystal structure transmission electron microscope

Successful Surgical Treatment of Bilateral Fibroepithelial Polyps in the Labia Minora of an Adolescent Female: A Case Report

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Open Journal of Obstetrics and Gynecology 2023年第4期13卷 775-779页

作者： Yutaka Kanamori takeshi saito Tamotsu Kobayashi Takako Yoshioka Division of Surgery Department of Surgical Specialties National Center for Child Health and Development Tokyo Japan Department of Pathology National Center for Child Health and Development Tokyo Japan

Background: Fibroepithelial polyp in the vulva is a rare disease mainly seen in female adolescents and young adults, and several reports were published in the past. Some cases showed large polyps that might be misinterpreted as malignant tumors such as aggressive angiomyxoma. Aim: We report a case of bilateral fibroepithelial polyps in the labia minora in an adolescent age girl. Case Presentation: A 16 year-old-girl was referred to our department for the treatment of an enlarged skin-tag appearance lesion at the right sided labia minora. The lesion was resected and the microscopic finding was a fibroepithelial polyp. One year after the first operation the patient was again referred to our department for the treatment of a skin-tag lesion at the left sided labia minora. It was again resected and the pathological diagnosis was a fibroepithelial polyp. Conclusion: Fibroepithelial polyp of the labia minora is not common and it is often seen in adolescent girls and in young adults. Bilateral lesions and skin-tag appearance are especially rare. The lesion should be excised for obtaining the correct diagnosis.

关键词： Fibroepithelial Polyp Labia Minora Skin Tag

Changes in exercise habits and pulse wave velocity with lifestyle modification in Japanese

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Open Journal of Epidemiology 2012年第2期2卷 50-54页

作者： Nobuyuki Miyatake Noriko Sakano takeshi saito Takeyuki Numata Department of Hygiene Faculty of Medicine Kagawa University Kagawa Japan Okayama Southern Institute of Health Okayama Health Foundation Okayama Japan

We investigated the changes in exercise habits and brachial-ankle pulse wave velocity (baPWV) with lifestyle modification in Japanese. We used data for 105 men (48.2 ± 13.8 years) and 110 women (48.6 ± 12.1 years) without any medications with a 1-year follow up. Subjects were given advice for dietary and lifestyle improvement. At the 1-year follow up, body weight and body mass index (BMI) were significantly decreased in both sexes. Abdominal circumference was significantly decreased in men. In addition, changes in exercise habits were noted in both sexes. In separate analysis in subjects without exercise habits at baseline, the changes in baPWV with exercise habits at follow up was lower than that without exercise habits at follow up in both sexes, but not at a significant level. Lifestyle modification may increase exercise habits, however, it did not evidently change baPWV in this population.

关键词： Lifestyle Modification baPWV Exercise Habits

Endoscopic management for congenital esophageal stenosis: A systematic review

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World Journal of Gastrointestinal Endoscopy 2015年第3期7卷 183-191页

作者： Keita Terui takeshi saito Tetsuya Mitsunaga Mitsuyuki Nakata Hideo Yoshida Department of Pediatric Surgery Graduate School of Medicine Chiba University

Congenital esophageal stenosis(CES) is an extremely rare malformation, and standard treatment have not been completely established. By years of clinical research, evidence has been accumulated. We conducted systematic review to assess outcomes of the treatment for CES, especially the role of endoscopic modalities. A total of 144 literatures were screened and reviewed. CES was categorized in fibromuscularthickening, tracheobronchial remnants(TBR) and membranous web, and the frequency was 54%, 30% and 16%, respectively. Therapeutic option includes surgery and dilatation, and surgery tends to be reserved for ineffective dilatation. An essential point is that dilatation for TBR type of CES has low success rate and high rate of perforation. TBR can be distinguished by using endoscopic ultrasonography(EUS). Overall success rate of dilatation for CES with or without case selection by using EUS was 90% and 29%, respectively. Overall rate of perforation with or without case selection was 7% and 24%, respectively. By case selection using EUS, high success rate with low rate of perforation could be achieved. In conclusion, endoscopic dilatation has been established as a primary therapy for CES except TBR type. Repetitive dilatation with gradual step-up might be one of safe ways to minimize the risk of perforation.

关键词： Esophageal stenosis Esophageal atresia Tracheoesophageal fistula Esophageal perforation Dilatation Endosonography Deglutition disorders Esophagoscopes Esophageal ring Plummer-Vinsonsyndrome

Relationship between peak oxygen uptake and regional body composition in Japanese subjects

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Journal of Sport and Health Science 2014年第3期3卷 233-238页

作者： Kanae Oda Nobuyuki Miyatake Noriko Sakano takeshi saito Motohiko Miyachi Izumi Tabata Takeyuki Numata Department of Hygiene Faculty of Medicine.Kagawa University Health Promotion and Exercise Program National Institute of Health and Nutrition Faculty of Sport and Health Science Ritsumeikan University Okayama Southern Institute of Health Okayama Health Foundation

Purpose： To investigate the link between peak oxygen uptake and regional body composition by dual energy X-ray absorptiometry （DEXA） in Japanese subjects. Methods： A total of 93 men （42.2 ± 12.3 years old） and 106 women （43.5 ± 12.3 years old） were enrolled in this cross-sectional investigation study. Peak oxygen uptake was measured by the breath-by-breath method. Regional body composition i.e., body fat mass, lean body mass, and body fat percentage was evaluated using DEXA. In addition, metabolic risk parameters were also evaluated. Results： Peak oxygen uptake was 37.6± 8.7 mL/kg/min in men and 31.1 ± 6.4 mL/kg/min in women, and decreased with age in both genders. Peak oxygen uptake was significantly correlated with total body fat percentage （men： r = -0.684, p 〈 0.0001; women： r = -0.681, p 〈 0.0001）. These associations remained even after adjusting for age and total lean body mass. However, peak work rate was positively and significantly correlated with leg lean body mass. Conclusion： Peak oxygen uptake was closely correlated with total body fat percentage in both genders. Aerobic exercise as well as leg resistance training might be useful for improving peak oxygen uptake in Japanese subjects. Copyright

关键词： Dual energy X-ray absorptiometry (DEXA) Japanese Leg muscle mass Peak oxygen uptake Regional body composition

Function of hepatocyte spheroids in bioactive microcapsules is enhanced by endogenous and exogenous hepatocyte growth factor

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Bioactive Materials 2023年第10期28卷 183-195页

作者： Kihak Gwon Daheui Choi Jose Mde Hoyos-Vega Harihara Baskaran Alan M.Gonzalez-Suarez Seonhwa Lee Hye Jin Hong Kianna M.Nguyen Ether Dharmesh Go Sugahara Yuji Ishida takeshi saito Gulnaz Stybayeva Alexander Revzin Department of Physiology and Biomedical Engineering Mayo ClinicRochesterMNUSA Department of Chemical and Biomolecular Engineering Case Western Reserve UniversityClevelandOHUSA Biomedical Engineering Saint Louis UniversitySt.LouisMOUSA University of Southern Californi1 Keck School of MedicineDepartment of MedicineDivision of Gastrointestinal and Liver DiseasesLos AngelesCAUSA Research and Development Department PhoenixBioCo.LtdKagamiyam1Higashi-Hiroshim1Hiroshim1Japan USC Research Center for Liver Diseases Los AngelesCAUSA

The ability to maintain functional hepatocytes has important implications for bioartificial liver development,cell-based therapies,drug screening,and tissue *** approaches can be used to restore hepatocyte function in vitro,including coating a culture substrate with extracellular matrix(ECM),encapsulating cells within biomimetic gels(Collagen-or Matrigel-based),or co-cultivation with other *** paper describes the use of bioactive heparin-based core-shell microcapsules to form and cultivate hepatocyte *** microcapsules are comprised of an aqueous core that facilitates hepatocyte aggregation into spheroids and a heparin hydrogel shell that binds and releases growth *** demonstrate that bioactive microcapsules retain and release endogenous signals thus enhancing the function of encapsulated *** also demonstrate that hepatic function may be further enhanced by loading exogenous hepatocyte growth factor(HGF)into microcapsules and inhibiting transforming growth factor(TGF)-β1 ***,bioactive microcapsules described here represent a promising new strategy for the encapsulation and maintenance of primary hepatocytes and will be beneficial for liver tissue engineering,regenerative medicine,and drug testing applications.

关键词： Droplet microfluidics Bioactive microcapsules Hepatocyte spheroid Heparin Hepatocyte growth factor

Measurement of DNA damage by terminal deoxynucleotidyl transferase reaction

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Advances in Biological Chemistry 2012年第3期2卷 243-247页

作者： Masaaki Kurasaki Yongkun Sun Miyako Komori Miki Miyajima Toshiyuki Hosokawa takeshi saito Environmental Adaptation Science Division of Environmental Science Development Graduate School of Environmental Science Hokkaido University Sapporo Japan Group of Environmental Adaptation Science Faculty of Environmental Earth Science Hokkaido University Sapporo Japan Higher Education Research and Development Division Institute for the Advancement of Higher Education Hokkaido University Sapporo Japan Laboratory of Environmental Health Sciences Faculty of Health Sciences Hokkaido University Sapporo Japan Laboratory of Environmental Health Sciences Graduate School of Health Science Hokkaido University Sapporo Japan

An improved terminal deoxynucleotidyl transferase- mediated dUTP-biotin nick end labeling method for the quantification of DNA damage in tissues and cultured cells was developed. Many reports have revealed that histochemistry of DNA damage can be visualized using immunohistochemistry for the terminal deoxynucleotidyl transferase reaction in tissue sections. However, few reports have described quantification of DNA damage in tissues or cells. In this study, to estimate the degree of DNA damage, the confirmed method for histochemistry using biotinylated dUTP and deoxynucleotidyl transferase was applied to label the cleaved DNA ends caused by DNA damage in tissues or cells. After end-labeling, avidin-conjugated peroxidase was reacted. A significant correlation was observed between numbers of cleaved DNA ends and peroxidase activity after the reaction. The obtained signals for presented method showed higher than those for ordinary method, and correlate with degree of DNA damage caused by serum deprivation and chemical dose. In addition, DNA damage caused by apoptosis in cells treated with 6-hydroxydopamine or Cu and in the tissues of rats administered a diet containing no Zn could be evaluated quantitatively using the present method.

关键词： DNA Damage Quantification TUNEL Apoptosis PC12 Cells