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An Unusual Acceleration of Amination Reactivity by the Proximal Ester Groups in Catechol Diesters: An Efficient Way for Peptide Synthesis

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Precision Chemistry 2023年第2期1卷 100-106页

作者： An Wu Hirotaka Ikeda hisashi yamamoto Peptide Research Center Chubu UniversityKasugaiAichi 487-8501Japan Materials Science Department MOLSIS Inc.Chuo-kuTokyo 104-0032Japan

Peptide bond formation has drawn more and more attention due to its importance in medicinal chemistry and drug *** active esters to construct peptide bonds is an indispensable strategy in this *** herein report a fast and efficient amination reaction to synthesize peptides from catechol *** monoesters are good active esters in peptide synthesis due to the anchimeric assistance *** previously reported work,the amination reaction was inactivated if the 2-hydroxyl group in the catechol esters was ***,we found an unusual acceleration of the amination reactivity when the 2-hydroxyl group was functionalized as an ester *** reaction can be complete in 2−3 min in some *** acceleration was found through experimental studies to not result from the anchimeric assistance *** proposed aπ*−π*interaction pathway between the two proximal ester *** computational studies were made to support this assumption.

关键词： catechol diesters peptide synthesis amination π*−π*interaction proximal ester groups

A Study of Optimum Switching Problem for Production Systems Considering Efficiency, Delivery Time and Green Evaluation

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Journal of Computer and Communications 2023年第2期11卷 158-171页

作者： Jing Sun Mingjuan Zhao Akihiro Yano hisashi yamamoto Department of Civil Engineering and Systems Management Nagoya Institute of Technology Nagoya Japan Department of System Design Management Systems Engineering Tokyo Metropolitan University Hino Japan

This paper aims to derive the optimal switching strategy for production system considering efficiency, delivery time and green evaluation. Nowadays more and more manufacturing and logistics systems not only pursue better work efficiency, but also focus on green energy evaluation issues. Cost reduction and shortening of delivery time are always important management issues in pursuit of efficiency and optimization of the entire production system because of global production competition. In a market situation where customer needs change in various ways, in particular, due to inadequate quality, changes in the local environment, natural disasters and so on. Therefore, prompt planning of management measures such as switching work processes and changing production methods has become an important issue. On the other hand, since the Paris Agreement came into effect, the construction of an environment-friendly production system has been required as an approach to environmental problems such as global warming. In this paper, we propose an optimum switching model of production systems considering efficiency, delivery time and green evaluation using a green evaluation index (GEC: Green Energy Coefficient). We also discuss the optimal switching strategy by numerical observation.

关键词： Green Evaluation Sustainable Production Optimal Switching Problem Production Networks Decarbonization Manufacture Management

Comprehensive Asymmetric Catalysis (Comprehensive Overviews in Chemistry) 1

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Laparoscopic cholecystectomy for gangrenous cholecystitis in around nineties: Two case reports

丛书名： Comprehensive Overviews in Chy

2000年

作者： Eric N. Jacobsen Andreas Pfaltz hisashi yamamoto

来源：畅想之星图书光盘版（南... 评论

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World Journal of Clinical Cases 2021年第14期9卷 3424-3431页

作者： Hiroyuki Inoue Toshiya Ochiai Hidemasa Kubo Yusuke yamamoto Ryo Morimura hisashi Ikoma Eigo Otsuji Division of Digestive Surgery Department of SurgeryKyoto Prefectual University of MedicineKyoto 6028566Japan Department of Surgery North Medical Center Kyoto Prefectural University of MedicineKyoto 6292261Japan Division of Digestive Surgery Department of SurgeryKyoto Prefectural University of MedicineKyoto 6028566Japan

BACKGROUND Gangrenous cholecystitis is a form of acute cholecystitis which involves gangrenous alterations in the gallbladder wall and it often follows an acute and serious *** herein report on two cases of very elderly people diagnosed early with gangrenous cholecystitis,who safely underwent laparoscopic cholecystectomy(LC)and both demonstrated a good *** SUMMARY Case 1:An 89-year-old *** underwent abdominal contrast-enhanced computed tomography(CECT)due to abdominal pain and *** gallbladder wall indicated the absence of contrast enhancement,thus leading to diagnosis of gangrenous cholecystitis and she therefore underwent *** her gallbladder demonstrated diffuse necrosis and it was also partly perforated,she was able to be discharged without any serious *** 2:A 91-year-old *** made an emergency visit with a chief complaint of abdominal *** CECT revealed swelling of the gallbladder and an ambiguous continuity of the gallbladder *** was diagnosed with gangrenous cholecystitis and underwent *** gallbladder had swelling and diffuse *** her preoperative blood culture was positive,she showed a good outcome following *** Although a definite diagnosis of gangrenous cholecystitis is difficult to make prior to surgery,if an early diagnosis can be made and appropriate treatment can be carried out,then even very elderly individuals may be discharged without major complications.

关键词： Gangrenous cholecystitis Laparoscopic cholecystectomy Elderly people Critical view of safety Tokyo guidelines 2018 Case report

Microstructure,Phase Transformation,Precipitation Behavior and Mechanical Properties of P/M Cu40Zn-1.0 wt%Ti Brass Alloy via Spark Plasma Sintering and Hot Extrusion

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Journal of Materials Science & Technology 2013年第11期29卷 1018-1024页

作者： Shufeng Li hisashi Imai Katsuyoshi Kondoh Faculty of Materials Science and Engineering Xi'an University of Technology Joining and Welding Research Institute Osaka University

The effect of titanium addition on the microstructure and mechanical properties of brass Cu4OZn has been studied via the powder metallurgy （P/M） route. The water-atomized Cu4OZn-1.0 wt% Ti alloy powder was consolidated at different temperatures in the range of 400-600℃ using spark plasma sintering （SPS） and hot extrusion subsequently. Results show that the super-saturated solid solution titanium element in rapidly cooled brass Cu4OZn powder created high chemical potential for a precipitate reaction, showing significant grain refinement effects on the consolidated Cu4OZn matrix. Consequently, excellent mechanical properties were obtained by precipitation hardening and work hardening after sintering and extrusion, with yield strength of 390 MPa, ultimate tensile strength of 617 MPa, and Vickers micro-hardness of 192 HV, which are 28.7%, 23.4%, and 23.9% higher values than those of extruded Cu4OZn brass, respectively.

关键词： Brass Spark plasma sintering Extrusion Microstructure Mechanical property Precipitation Phase transformation

Multi-Physics CFD Simulations in Engineering

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Journal of Thermal Science 2013年第4期22卷 287-293页

作者： Makoto yamamoto Tokyo University of Science Department of Mechanical Engineering 6-3-1 NiijukuKatsushika-ku Tokyo 125-8585 Japan

Nowadays Computational Fluid Dynamics （CFD） software is adopted as a design and analysis tool in a great number of engineering fields. We can say that single-physics CFD has been suffciently matured in the practical point of view. The main target of existing CFD software is single-phase flows such as water and air. However, many multi-physics problems exist in engineering. Most of them consist of flow and other physics, and the interactions between different physics are very important. Obviously, multi-physics phenomena are critical in devel- oping machines and processes. A multi-physics phenomenon seems to be very complex, and it is so difficult to be predicted by adding other physics to flow phenomenon. Therefore, multi-physics CFD techniques are still under research and development. This would be caused from the facts that processing speed of current computers is not fast enough for conducting a multi-physics simulation, and furthermore physical models except for flow physics have not been suitably established. Therefore, in near future, we have to develop various physical models and ef- ficient CFD techniques, in order to success multi-physics simulations in engineering. In the present paper, I will describe the present states of multi-physics CFD simulations, and then show some numerical results such as ice accretion and electro-chemical machining process of a three-dimensional compressor blade which were obtained in my laboratory. Multi-physics CFD simulations would be a key technology in near future.

关键词： Computational fluid dynamics Multi-physics Engineering problems

How does the 120-year cycle mast seeding of dwarf bamboo affect the rodent population?

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Ecological Processes 2022年第1期11卷 577-586页

作者： Hanami Suzuki Haruka Kashiwagi hisashi Kajimura Laboratory of Forest Protection Graduate School of Bioagricultural SciencesNagoya UniversityFurochoChikusakuNagoya 468-8601Japan Nagoya City Science Museum NakakuNagoya 460-0008Japan

Background:In 2017,large-scale flowering,seeding,and dying events of dwarf bamboo(Sasa borealis)occurred in a wide range in central Japan for the first time in 120 *** phenomenon of ***,like the mast seeding of trees,could be expected to provide a large amount of food for seed-eating rodents and gradually affect their ecology and population *** captured rodents in survey plots in a secondary broad-leaved forest with the phenomenon from 2018 to 2019 to investigate the species,the number of individuals,growing stage,sex,and body *** addition,we also compared the capture data for 2 years(2018–2019)with that for the mast seeding year(2017)and 6 years before it(2011–2016).Results:The mast seeding of *** greatly increased the population size of rodents,especially Apodemus speciosus and ***,Eothenomys smithii did not show such an *** of the captured rodent individuals were already adults at the time of new capture,and the proportion of male juveniles was extremely *** results suggest that the mast seeding of *** created unusually rich food availability for the population concentration of rodents due to their ***,body mass was not significantly different before and after the mast *** addition,the increased populations of the two Apodemus species did not decline 2 years after the *** masting,contrary to the previously reported decrease of rodent populations after tree ***:Our results indicate that the mast seeding of *** affected the population dynamics of Apodemus species over a long time and their individual composition of different growth ***,it did not affect their body mass.

关键词： Apodemus speciosus Apodemus argenteus Eothenomys smithii Mast seeding Population dynamics Predator satiation hypothesis Sasa borealis

SYNTHESIS AND CHARACTERIZATION OF SOLUBLE POLYPHENYLENE COMPOSED OF p-PHENYLENE AND m-PHENYLENE UNITS

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Chinese Journal of Polymer Science 2002年第4期20卷 333-337页

作者： Takakazu yamamoto Chemical Resources Laboratory Tokyo Institute of Technology Tokyo Japan

NiCl2(bpy) catalyzed polycondensation between p-dibromobenzene and m-dibromobenzene has been carried out under various conditions. The polycondensation endows the copolymer with an M-n of 2300 (by GPC, polystyrene standards) and good solubility in organic solvents. The fluorescence spectra of the copolymer measured with tetrahydrofuran solution shows an emission maximum (lambda(max)) at 372.8 nm, whereas for the film the maximum shifts to 436.6 nm.

关键词： polyphenylene copolycondensation conjugated polymer

Coexistence of cluster and shell-model aspects in nuclear systems

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Frontiers of physics 2018年第6期13卷 89-113页

作者： Yoshiko Kanada-En'yo hisashi Horiuchi Department of Physics Kyoto University Kitashirakawa Oiwake-Cho Kyoto 606-8502 Japan Research Center for Nuclear Physics (RCNP) Osaka University Ibaraki Osaka 567-0047 Japan

We discuss cluster phenomena in light nuclei. As examples of typical cluster structures, we first review cluster structures of 12C, 16O, and 20Ne, and then introduce some topics of cluster phenomena in light neutron-rich nuclei such as Be and C isotopes. A particular attention is paid on coexistence of cluster and shell-model aspects.

关键词： cluster nuclear structure