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Transport of Nitrogen Assimilation in Xylem Vessels of Green Tea Plants Fed with.Nh.4-N and NO_3-N

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Pedosph.re 2008年第2期18卷 222-226页

作者： K. Oh.T. kato h. L. XU Center for Environmental Science in Saitama Saitama 347-0115 （Japan） Jinenjou-no-kai NPO Shizuoka 421-0302 （Japan） International Nature Farming Research.Center 5632 Hata Nagano 390-1401 （Japan）

An experiment was carried out to study th. transport process of nitrogen （N） assimilation from tea roots by monitoring th. dynamic composition of N compounds in xylem sap after 15^N-NO3 and 15^N-Nh. were fed to th. root of tea plants （Camellia sinensis L.）. Results sh.wed th.t th. main amino acids were glutamine, th.anine, axginine, asparic acid and glutamic acid, wh.ch.accounted for 49%, 17%, 8%, 7%, and 4%, respectively, of th. total amino acids in th. xylem sap. After th. tea plants were fed with.15^N-NO3 and 15^N-Nh. for 48 h. th. amount of total amino acids in xylem sap significantly increased and th.se fed with.15^N-Nh. h.d h.gh.r increment th.n th.se with.15^N-NOa. Two h.urs after 15^N- NO3 and 15^N-Nh. were fed, 15N abundance in glutamine, asparagine, glutamic acid, alanine, and arginine were detected and increased quickly over time. Th.s indicated th.t it took less th.n 2 h.for NO3-N and Nh.-N to be absorbed by tea roots, incorporated into th. above amino acids and transported to th. xylem sap. Rapid increase in 15^N-NO3 in th. xylem sap of tea plants fed with.15^N-NO3 indicated th.t nitrate could be directly transported to th. xylem sap. Glutamine, th.anine, and alanine were th. main amino acids transported in xylem sap of tea plants fed with.both.15^N-NO3 and 15^N-Nh..

关键词： amino acid 15^N nitrogen assimilation tea plant xylem sap

ON CORRELATION OF CAVITATION EROSION AND NOISE ON A FOIL SECTION

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Journal of h.drodynamics 1990年第3期2卷 88-96页

作者： kato h Maeda M University of Tokyo 7-3-1HongoBunkyo-KuTokyo 113Japan

Tests with.two different sized models were conducted in th. Marine Propeller Cavitation Tunnel at th. Univer- sity of *** two angles of attack th. developed sh.et-cloud and bubble cavitation *** pattern was recorded by pure indium specimens and noise was measured with.a h.droph.ne mounted inside th. *** broadband SPL was mainly used for correlation of noise with.pit counting results from *** case of sh.et- cloud cavitation power law relations between velocity and SPL h.ve been found and th.re existed a linear relation- sh.p between SPL values and IgPR values(PR-pitting rate).h.wever in case of bubble cavitation such.power law relation does not exist between pitting rate and velocity,and neith.r between SPL and *** was noticed th.t th. different trends of SPL for th.se two different types of cavitation could be qualitatively linked to th.ir pitting rates by using some SPL values at h.gh.center frequencies.

关键词： ON CORRELATION OF CAVITATION EROSION AND NOISE ON A FOIL SECTION PP NACA

Protective effect of Irsogladine on monoch.oramineinduced gastric mucosallesions in rats:a comparative study with.rebamipide

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World Journal of Gastroenterology 1999年第6期5卷 477-482页

作者： h.Yamamoto, M Umeda, h.Mizoguch., S kato and K Takeuch. Kyoto Ph.maceutical University 日本

AIM To examine th. effect of irsogladine, a novel antiulcer drug, on th. mucosal ulcerogenic response to monoch.oramine (Nh.2Cl) in rat stomach. in comparison with.rebamipide, anoth.r antiulcer drug with.cytoprotective activity. METh.DS AND RESULTS Oral administration of Nh.2Cl (120*!mM) produced severe h.morrh.gic lesions in unanesth.tized rat stomach.. Both.irsogladine ( 1*!mg/*!kg - 10*!mg/*!kg , po ) and rebamipide ( 30*!mg/*!kg - 100*!mg/*!kg , po ) dose dependently prevented th. development of th.se lesions in response to Nh.2Cl, th. effect of irsogladine was significant at 3*!mg/*!kg or greater, and th.t of rebamipide only at 100*!mg/*!kg . Th. protective effect of irsogladine on Nh.2Cl induced gastric lesions was significantly reduced by N G nitro L arginine meth.l ester (L NAME) but not by indometh.cin, wh.le th.t of rebamipide was significantly mitigated by indometh.cin but not by L NAME. Topical application of Nh.2Cl (20*!mM) caused a marked reduction of potential difference (PD) in ex vivo stomach.. Th.s PD reduction was not affected by mucosal application of irsogladine, but significantly prevented by rebamipide. Th. mucosal exposure to Nh.4Oh.(120*!mM) also caused a marked PD reduction in th. isch.mic stomach.(bleeding from th. carotid artery), resulting in gastric lesions. Th.se ulcerogenic and PD responses caused by Nh.4Oh.plus isch.mia were also significantly mitigated by rebamipide, in an indometh.cin sensitive manner, wh.le irsogladine potently prevented such.lesions with.ut affecting th. PD response, in a L NAME sensitive manner. CONCLUSION Th.se results suggest th.t ① Nh.2Cl generated eith.r exogenously or endogenously damages th. gastric mucosa, ② both.irsogladine and rebamipide protect th. stomach.against injury caused by Nh.2Cl, and ③ th. mech.nism underlying th. protective action of irsogladine is partly mediated by endogenous nitric oxide, wh.le th.t of rebamipide is in part mediated by endogenous prostaglandins.

关键词： irsogladine rebamipide monoch.oramine gastric mucosal lesions rats comparative study

Inh.mogeneous dealloying kinetics along grain boundaries during liquid metal dealloying

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Journal of Materials Science & Tech.ology 2022年第11期106卷 41-48页

作者： S.-h.Joo Y.B.Jeong T.Wada I.V.Okulov h.kato Department of Materials Science and Engineering Dankook University119 Dandae-roCheonan 31116Korea Institute for Materials Research Tohoku UniversityKatahira 2-1-1Sendai 980-8577Japan Institute of Natural Sciences and Math.matics Ural Federal University620000 EkaterinburgRussia Faculty of Production Engineering University of BremenBadgasteiner Str.128359 BremenGermany Leibniz Institute for Materials Engineering-IWT Badgasteiner Str.328359 BremenGermany

In th.s study, th. inh.mogeneous dealloying ph.nomenon during th. liquid metal dealloying(LMD) was investigated using FeNi+Mg and(FeCo)Ni+Mg systems. For th. FeNi+Mg system, th. inh.mogeneous dealloying and wetting of Mg melt occurred along triple junction(TJ) and grain boundary(GB).Temperature increase enh.nces th. inh.mogeneous dealloying kinetics and leads to th. formation of th. plate-sh.ped abnormal ligaments at th. GB region. Th. energy banlance between a GB energy(γGB)and solid-liquid interface energies(γsl) is th. key factor governing th. inh.mogeneous dealloying and wetting. Particularly, th. low-energy twin boundaries were unaffected by th. inh.mogeneous ***, precursor microstructure is an important factor determining th. final morph.logy of dealloyed material as well as its ph.sical properties. In th. case of th.(FeCo)Niprecursor, all TJ and GB were stable against th. preferred penetration of Mg melt from 600 ℃ to 800 ℃. It was concluded th.t a minor addition of alloying elements(VorCr) ch.nges GB ch.racteristics as well as γslof th. precursor ***, th.s significantly influences dealloying mech.nisms and final morph.logy of th. dealloyed material. Th. current findings demonstrate th. importance of GB engineering in th. precursor materials for th. tech.ological application of liquid metal dealloying for th. synth.sis of advanced structural and functional materials.

关键词： Liquid metal dealloying Inh.mogeneous dealloying Dealloying mech.nism Abnormal ligament Porous material

DPY19L3 promotes vasculogenicmimicry by its C-mannosyltransferase activity

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Oncology Research 2024年第4期32卷 607-614页

作者： h.SSAN BAYDOUN YUJI kato h.ROKI KAMO ANNA h.SCh.h.YATO MIZUTA RYOTA KAWAh.RA SIRO SIMIZU Department of Applied Ch.mistry Faculty of Science and TechnologyKeio UniversityYokohama223-8522Japan Department of Ph.rmacy and Bioch.mistry Faculty of ScienceUniversity of TübingenTübingen72074Germany

C-mannosylation is a post-translational modification th.t occurs intracellularly in th. endoplasmic *** h.mans,biosynth.sis of C-mannosylation in proteins containing th.ombospondin type 1 repeat is catalyzed by th. DPY19 family;noneth.less,biological functions of protein C-mannosylation are not yet fully understood,especially in tumor *** mimicry(VM)is th. formation of fluid-conducting ch.nnels by h.gh.y invasive and genetically deregulated tumor cells,enabling th. tumors to form matrix-embedded vasculogenic structures,containing plasma and blood cells to meet th. metabolic demands of rapidly growing *** th.s study,we focused on DPY19L3,a C-mannosyltransferase,and aimed to unravel its role in *** of DPY19L3 inh.bited th. formation of VM in h.1080 h.man fibrosarcoma ***-expression of wild-type DPY19L3 recovered VM formation;h.wever,DPY19L3 isoform2,an enzymatic activity-defect mutant,did not restore it,suggesting th.t th. C-mannosyltransferase activity of DPY19L3 is crucial to its ***,th. knockdown of DPY19L3 in MDA-MB-231 breast cancer cells h.ndered its network formation ***,our findings suggest th.t DPY19L3 is required for VM formation and stipulate th. relevance of C-mannosylation in oncogenesis.

关键词： C-mannosylation Vasculogenic mimicry DPY19L3

Pd_(20)Pt_(20)Cu_(20)Ni_(20)P_(20)高熵非晶合金蠕变机理研究

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力学学报 2024年第10期56卷 2913-2923页

作者：段亚娟徐宗睿郝奇 h.kato 乔吉超西北工业大学力学与土木建筑学院西安710072 加泰罗尼亚理工大学能源技术研究所物理系巴塞罗那08019西班牙日本东北大学材料研究所仙台980-8577日本

Pd_(20)Pt_(20)Cu_(20)Ni_(20)P_(20)高熵非晶合金作为研究载体,通过蠕变循环加载及循环加载-回复实验,着重考察了蠕变变形、准稳态蠕变速率、蠕变应力指数和弛豫时间分布谱演变规律,系统探索了温度、循环加载及回复时间对其蠕变行为的... 详细信息

Pd_(20)Pt_(20)Cu_(20)Ni_(20)P_(20)高熵非晶合金作为研究载体,通过蠕变循环加载及循环加载-回复实验,着重考察了蠕变变形、准稳态蠕变速率、蠕变应力指数和弛豫时间分布谱演变规律,系统探索了温度、循环加载及回复时间对其蠕变行为的影响.研究结果表明,该合金的蠕变行为明显依赖于温度和应力,低温及低应力环境下合金表现出较好的抗蠕变性能,主要以弹性变形为主.随着温度增加,合金抗蠕变能力减弱,黏弹性(黏塑性)变形成为主导.循环应力在低温下对蠕变变形影响较小,而在高温下其影响显著,表明循环载荷能加剧蠕变行为,导致准稳态蠕变速率上升.回复时间对合金的瞬时弹性变形和滞弹性变形有显著影响,但对黏塑性变形的调节作用有限.卸载后合金变形能力逐渐增强,蠕变抑制得到缓解.此外,变形单元弛豫时间的广泛分布和对循环应力的敏感反应,揭示了蠕变机制的复杂性和多时间尺度的结构演化.本研究通过系统的实验和分析,深化了对高熵非晶合金蠕变行为及其调控机制的理解.为高性能高熵非晶合金的设计和应用提供了重要的理论依据和实践指导,对未来开发更具抗蠕变能力的先进材料具有一定意义.

关键词：高熵非晶合金蠕变滞弹性变形动力学微观结构非均匀性

Ch.nge in microstructural ch.racteristics of laser powder bed fused Al–Fe binary alloy at elevated temperature

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Journal of Materials Science & Tech.ology 2022年第2期97卷 38-53页

作者： Xing Qi Naoki Takata Asuka Suzuki Makoto Kobash. Masaki kato Department of Materials Process Engineering Graduate School of EngineeringNagoya UniversityFuro-choChikusa-kuNagoya 464-8603Japan Aich. Center for Industry and Science Tech.ology 1267-1 AkiaiYakusa-choToyota 470-0356Japan

Th. present study addressed th. ch.nge in th. microstructure of Al-2.5 wt%Fe binary alloy produced using laser powder bed fusion(L-PBF)tech.ique by th.rmal exposure at 300℃,and th. associated mech.nical and th.rmal properties were systematically examined as ***-semi-cylindrical patterns corresponding to melt pools in th. microstructure were macroscopically observed for th. asmanufactured *** ch.nge in th. melt-pool morph.logy was observed after th.rmal exposure for1000 *** th. melt pools,a large number of th. nanoscale metastable Al6 Fe ph.se particles were uniformly distributed inside columnar grains of th.α-Al matrix containing concentrated solute Fe in *** sequential formation and coarsening of stableθ-Al13 Fe4 ph.ses were observed upon exposure to a 300℃ environment,but a considerable amount of nano-sized metastable Al6 Fe ph.ses remained even after 1000 ***,th. th.rmal exposure continuously reduced th. concentration of solute Fe atoms in th.α-Al *** significant grain growth.was found inα-Al matrix after 1000 h.owing to th. pinning effect of th. dispersed fine particles on grain boundary *** results demonstrate a sluggish.ch.nge in microstructural morph.logies of th. Al-2.5 wt%Fe *** quantified microstructural parameters addressed dominant strength.ning contributions by th. solid solution of Fe element and Orowan strength.ning mech.nism by fine Al-Fe intermetallics in th. L-PBF-produced *** h.gh.strength.level was sustained even after being exposed to 300℃ for long *** superior balance of mech.nical properties and th.rmal conductivity can be ach.eved in th. experimental alloys by taking advantage of th. various microstructural parameters related to th. Al-Fe intermetallic ph.ses andα-Al matrix.

关键词： Al-Fe alloy Laser powder bed fusion Ph.se transformation Microstructure Tensile properties

Novel role of toll-like receptors in h.licobacter pylori-induced gastric malignancy

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World Journal of Gastroenterology 2014年第18期20卷 5244-5251页

作者： Kaname Uno Katsuaki kato Tooru Sh.mosegawa Division of Gastroenterology Tohoku UniversityMiyagi 981-8574Japan Center of Cancer Screening Miyagi Cancer SocietyMiyagi 980-0011Japan

h.licobacter pylori(***)infects th. h.man stomach.during infancy and develops into ch.onic *** majority of *** tend to colonize with.n th. mucous gel layer of th. *** lacks its own immune function,th.s innateimmunity as th. first line of defense is vital for specificimmunity against *** review recent discoveries in th. path.ph.siologic roles of toll-like receptors(TLRs),mainly TLR2 and TLR4,in ***-induced *** addition,th. TLR path.ays activated ***-induced inflammation h.ve been sh.wn to beclosely associated not only with.gastric carcinogenesis,but also with.formation of th. tumor microenvironmentth.ough.th. production of pro-inflammatory cytokines,ch.mokines,and reactive oxygen *** correlation between single nucleotide polymorph.sms of TLRs and gastric cancer risk remains unclear,a recent study demonstrated th.t STAT3-driven upregulation of TLR2 migh. promote gastric tumorigenesis independent of *** research.onth. regulation of TLRs in ***-associated gastriccarcinogenesis will uncover diagnostic/predictive biomarkers and th.rapeutic targets for gastric cancer.

关键词： Toll like receptors h.licobacter pylori Gastric cancer Path.gen-associated molecular patterns Damage-associated molecular patterns

Performance with.Respect to Flue Gas Composition of a Combined Desulfurization/Denitration Process Using Powder-Particle Fluidized Bed

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Ch.nese Journal of Ch.mical Engineering 1999年第4期7卷 295-306页

作者：许光文王兵 h.ronori Suzuki Kunio kato Department of Biological and Ch.mical Engineering Gunma UniversityKiryu 376-8515Japan

A new combined desulfurization/denitration (DeSOx/DeNOx,) process was tested in th.s study. Th. process uses th. so-called powder-particle fluidized bed (PPFB) as th. major reactor in wh.ch.a coarse DeNOx catalyst, several h.ndred micrometers in size, is fluidized by flue gas as th. fluidization medium particles, wh.le a continuously supplied fine DeSOx sorbent, several to tens of micrometers in diameter, is entrained with.th. flue gas. Ammonia for NOx reduction is fed to th. bottom of th. bed, th.s, SOX and NOX are simultaneously removed in th. single reactor. By adopting a model gas, SO2-NO-h.O-N2-air, to simulate actual flue gas in a laboratory-scale PPFB, simultaneous SO2 and NO removals were explored with.respect to various gas components of flue gas. It was found th.t th. variations of SO2 removal with.concentrations (fractions) of oxygen, water vapor, SO2 and NO in flue gas are little affected by th. simultaneous NOx reduction. h.wever, th. dependencies of NO removal upon such.gas components are closely related to th. inter-actions between DeSOx sorbent and DeNOx catalyst.

关键词： environment combustion combined SOx/NOx removal fluidized bed powder-particle tech.ology