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Experimental study on boundary lubricity of superficial area of articular cartilage and synovial fluid

Friction 2024年第5期12卷 981-996页

作者： Wenxiao LI Takehiro MORITA Yoshinori SAWAE Departure of Mechanical Engineering Kyushu UniversityFukuoka8190395Japan International Institute for Carton-Neutral Energy research Kyushu UniversityFukuoka8190395Japan Advanced research Center for Biomechanics Kyushu UniversityFukuoka8190395Japan

The boundary lubrication mechanism at the articulating surface of natural synovial joints has been the subject of much discussion in *** this study,to elucidate the lubricating function of the superficial area of articular cartilage and synovial fluid(SF),cartilage specimens were processed with four different treatments:gentle and severe washing with detergent,incubation in NaCl solution,and trypsin digestion to selectively remove certain constituents from the cartilage ***,the frictional characteristics were examined in phosphate-buffered saline(PBS)and SF against *** reciprocating sliding tests with a spherical glass probe and square articular cartilage specimens were performed at low contact loads in the mN range to extract the frictional behavior in the superficial area of the cartilage ***,the cartilage surface was observed to confirm the effects of treatments on the morphology of the cartilage surface using a fluorescence microscope and water-immersion *** coefficient of friction(COF)of the prepared cartilage specimens was varied from 0.05 to over 0.3 in ***,a certain group of cartilage specimens exhibited a low COF of less than 0.1 with limited *** the low COF group of specimens,all four treatments increased the COF in PBS to different extents,and fluorescence microscopy revealed that the integrity of the cartilage surface was deteriorated by *** means that the intact cartilage surface had lubricating constituents to maintain low friction,and the removal of such constituents resulted in the loss of the intrinsic boundary lubricity of the cartilage *** variation in the COF of the cartilage specimens was suppressed in SF because it had a clear boundary lubrication effect on the cartilage *** lubricating effect of SF could be confirmed even after degenerative treatment.

关键词： articular cartilage synovial fluid the uppermost superficial layer boundary lubrication

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A single atom photocatalyst co-doped with potassium and gallium for enhancing photocatalytic hydrogen peroxide synthesis

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Nano research 2024年第8期17卷 7027-7038页

作者： Wenan Cai Yuichiro Tanaka Xing Zhu Teruhisa Ohno Department of Applied Chemistry Faculty of EngineeringKyushu Institute of TechnologyKitakyushu 804-8550Japan College of Bioresources Chemical and Materials Engineering Shaanxi University of Science&TechnologyXi’an 710021China

Polymer carbon nitride(PCN)is widely used in ***,pristine PCN has disadvantages such as insufficient visible light absorption and low photogenerated carrier separation efficiency that greatly limited the photocatalytic *** a non-toxic metal,gallium has the potential to solve the defects of *** ions coordinated with nitrogen in carbon nitride to form Ga-N active sites and improved the photocatalytic *** doped potassium ions form a transmission channel for charge redistribution and transfer between adjacent layers,which is beneficial for better separation of photoexcited *** this study,a series of PCN co-doped with gallium and potassium(Ga-K-PCN)were *** experimental results indicated photocatalytic generation of hydrogen peroxide proceeds through the 2e−oxygen reduction reaction ***,Nyquist plots and photocurrent results further proved that the presence of Ga-N sites and potassium ion doping could significantly improve the separation/transfer of intra-planar and interlayer charge carriers and thus enhance photocatalytic *** Ga10-K3-PCN photocatalysts promoted yield of H_(2)O_(2),with reactivity at 28.2μmol/(g·h)and solar-to-chemical conversion efficiency at 0.64%,surpassed that of a typical photo-catalyst based on PCN(0.18%).

关键词： photocatalysis gallium oxygen reduction reaction H_(2)O_(2) production

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Neural plasticity in Parkinson's disease: a neuroimaging perspective

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Neural Regeneration research 2024年第6期19卷 1203-1205页

作者： Christina Andica Koji Kamagata Department of Radiology Juntendo University Graduate School of Medicine Faculty of Health Data science Juntendo University

Parkinson’s disease(PD) is a progressive neurodegenerative disorder characterized primarily by classical motor signs of bradykinesia,rigidity,tremors,and postural instability usually manifesti ng unilate rally or at least *** disease involves a loss of dopaminergic neurons projecting from the substantia nigra pars compacta to the dorsal striatum,

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MicroRNA-329-3p inhibits the Wnt/β-catenin pathway and proliferation of osteosarcoma cells by targeting transcription factor 7-like 1

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Oncology research 2024年第3期32卷 463-476页

作者： Hur SUN MASANORI KAWANO TATSUYA IWASAKI ICHRO ITONAGA YUTA KUBOTA HROSHI TSUMURA KAZUHRO TANAKA Department of Orthopaedic Surgery Faculty of MedicineOita UniversityOita879-5503Japan

An important factor in the emergence and progre sion of osteosarcoma(OS)is the dysregulated expression of microRNAs(miRNAs).Transcription factor 7-like 1(TCF7LI),a member of the T cell factor/lymphoid enhancer factor(TCF/LEF)transcription factor family,interacts with the Wnt signaling pathway regulator β-catenin and acts as a DNA-specific binding *** study sought to elucidate the impact of the interaction between miR 3293p and TCF7L1 *** growth and apoptosis of OS and analyze the regulatory expression relationship between miRNA and mRNA in osteosarcoma cells using a variety of ***329-3p was significantly downregulated,while TCF7L1 was considerably up-regulated in all examined OS cell ***,a clinical comparison study was performed using the TCGA ***,the regulatory relationship between miR-329-3p and TCF7L1 on the proliferation and apoptosis of OS cells was verified through in vitro and in vivo *** miR 329-3p was transfected into the OS cell line,the expression of TCF7L1 decreased,the proliferation of OS cells was inhibited,the cytoskeleton disintegrated,and the nucleus condensed to fom apoptotic *** expression of proteins that indicate apoptosis increased *** cell cycle was arrested in the G0/G1 phase,and the G1/S transition was *** introduction of miR 3293p also inhibited downstream Cyclin D1 of the Wnt *** experiments indicated that the overexpression of miR-329-3p signi ficanly inhibited the growth of OS xenografts in nude mice,and the expression of TCF7L1 and C-Myc in tumor tssues *** 329-3p was significantly reduced in OS cells and played a suppressive role in tumorigenesis and proliferation by targeting TCF7L1 both in vitro and in *** cell cycle arrest and pathway inhibition were observed upon the regulation of TCF7LI by miR *** these results,it can be inferred that miR.3293p exerts anticancer efects in osteosarcom

关键词： MiR-329-3p TCF7L1 Wnt/β-catenin pathway Osteosarcoma Proliferation

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Classification of complete 3-dimensional self-shrinkers in the Euclidean space R^(4)

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science China Mathematics 2024年第4期67卷 873-882页

作者： Qing-Ming Cheng Zhi Li Guoxin Wei Department of Applied Mathematics Faculty of ScienceFukuoka UniversityFukuoka 814-0180Japan College of Mathematics and Information science Henan Normal UniversityXinxiang 453007China School of Mathematical sciences South China Normal UniversityGuangzhou 510631China

In this paper,we completely classify 3-dimensional complete self-shrinkers with the constant norm S of the second fundamental form and the constant f3in the Euclidean space R^(4),where hij’s are components of the sec... 详细信息

关键词： mean curvature ow self-shrinker the generalized maximum principle

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Migratory mode transition of astrocyte progenitors in the cerebral cortex: an intrinsic or extrinsic cell process?

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Neural Regeneration research 2024年第3期19卷 471-472页

作者： Michio Miyajima Hidenori Tabata Kazunori Nakajima Department of Anatomy Keio University School of MedicineShinjuku-kuTokyoJapan Department of Molecular Neurobiology Institute for Developmental ResearchAichi Developmental Disability CenterKasugaiAichiJapan

The cerebral cortex is comprised of properly localized cell types that exert their specific *** the developing brain,cells migrate from the germinal region to their functional locations(Silva et al.,2019;Cossart and Garel,2022).For example,neocortical excitatory neurons are generated in the cerebral ventricular and subventricular zones,move to the developing cortical plate via radial migration,and reside in a radial array of six neuronal layers(Oishi and Nakajima,2018).On the other hand,cortical interneurons are mainly generated in ganglionic eminences,migrate tangentially across the cerebral cortex,and reach their final destinations in the cortex(Lim et al.,2018).The failure of neuronal migration leads to defects in cortical layer *** the mechanisms of neuronal distribution have been well examined,how astrocytes are diffusely distributed in the cortex is still *** are glial cells in the cerebral cortex with several functions,including metabolic support and synapse formation(Abbott et al.,2006;Bosworth and Allen,2017;Allen and Lyons,2018).For example,astrocytes establish synaptic connectivity in the developing brain while they contact numerous synapses and maintain optimal neuronal activity in the adult *** the developing brain,astrocytes are primarily generated from radial glia after the neurogenic *** a certain type of astrocyte called fibrous astrocytes populates the white matter,protoplasmic astrocytes migrate to the cortical plate during neural network formation.

关键词： cerebral migrate Abbott

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Mechanocatalysis of CO to CO_(2)on TiO_(2)surface controlled at atomic scale

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Nano research 2024年第7期17卷 5826-5834页

作者： Yuuki Adachi Robert Turanský Ján Brndiar Kamil Tokár Qiang Zhu Huan Fei Wen Yasuhiro Sugawara IvanŠtich Yan Jun Li Department of Applied Physics Osaka University2-1 YamadaokaSuitaOsaka 565-0871Japan Institute of Physics Slovak Academy of SciencesBratislava 84511Slovakia Institute of Informatics Slovak Academy of SciencesBratislava 84507Slovakia Faculty of Natural sciences University of Ss.Cyril and MethodiusTrnava 91701Slovakia Key Laboratory of Instrumentation science and Dynamic Measurement School of Instrument and ElectronicsNorth University of ChinaTaiyuan 030051China

The common ways to activate a chemical reaction are by heat,electric current,or ***,mechanochemistry,where the chemical reaction is activated by applied mechanical force,is less common and only poorly understood at the atomic *** we report a tip-induced activation of chemical reaction of carbon monoxide to dioxide on oxidized rutile TiO_(2)(110)*** activation is studied by atomic force microscopy,Kelvin probe force microscopy under ultrahigh-vacuum and liquid nitrogen temperature conditions,and density functional theory(DFT)*** reaction is inferred from hysteretic behavior of frequency shift signal further supported by vector force mapping of vertical and lateral forces needed to trigger the chemical reaction with torque motion of carbon monoxide towards an oxygen *** reaction is found to proceed stochastically at very small tip-sample ***,the local contact potential difference reveals the atomic-scale charge redistribution in the reactants required to unlock the *** results open up new insights into the mechanochemistry on metal oxide surfaces at the atomic scale.

关键词： atomic resolution mechanochemistry atomic force microscopy Kelvin probe force microscopy density functional theory(DFT)simulation CO oxidation catalysis rutile TiO_(2)surface

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Initial decrease in the lipoprotein(a)level is a novel prognostic biomarker in patients with acute coronary syndrome

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World Journal of Cardiology 2024年第6期16卷 329-338页

作者： Yasuhiko Saeki Jun Sawaguchi Satori Akita Taka-aki Takamura Kosuke Fujibayashi Minoru Wakasa Hironobu Akao Michihiko Kitayama Yasuyuki Kawai Kouji Kajinami Department of Cardiology Kanazawa Medical UniversityUchinada 9200293Japan Trans-catheter Cardiovascular Therapeutics Kanazawa Medical UniversityUchinada 9200293Japan

BACKGROUND Lipoprotein(a)[Lp(a)]is a causal risk factor for atherosclerotic cardiovascular diseases;however,its role in acute coronary syndrome(ACS)remains *** To investigate the hypothesis that the Lp(a)levels are altered by various conditions during the acute phase of ACS,resulting in subsequent cardiovascular *** From September 2009 to May 2016,377 patients with ACS who underwent emergent coronary angiography,and 249 who completed≥1000 d of follow-up were ***(a)levels were measured using an isoform-independent assay at each time point from before percutaneous coronary intervention(PCI)to 48 h after *** primary endpoint was the occurrence of major adverse cardiac events(MACE;cardiac death,other vascular death,ACS,and non-cardiac vascular events).RESULTS The mean circulating Lp(a)level decreased significantly from pre-PCI(0 h)to 12 h after(19.0 mg/dL to 17.8 mg/dL,P<0.001),and then increased significantly up to 48 h after(19.3 mg/dL,P<0.001).The changes from 0 to 12 h[Lp(a)Δ0-12]significantly correlated with the basal levels of creatinine[Spearman’s rank correlation coefficient(SRCC):-0.181,P<0.01]and Lp(a)(SRCC:-0.306,P<0.05).Among the tertiles classified according to Lp(a)Δ0-12,MACE was significantly more frequent in the lowest Lp(a)Δ0-12 group than in the remaining two tertile groups(66.2%vs 53.6%,P=0.034).A multivariate analysis revealed that Lp(a)Δ0-12[hazard ratio(HR):0.96,95%confidence interval(95%CI):0.92-0.99]and basal creatinine(HR:1.13,95%CI:1.05-1.22)were independent determinants of subsequent *** Circulating Lp(a)levels in patients with ACS decreased significantly after emergent PCI,and a greater decrease was independently associated with a worse prognosis.

关键词： Lipoprotein(a) Acute coronary syndrome Percutaneous coronary intervention Major adverse cardiac events Prognosis

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The Role of Jasmonates as Antibulbing Substances in the Bulb Formation of Onion

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Agricultural Biotechnology 2024年第1期13卷 1-4,8页

作者： Noboru Takada Atsushi Saito Yuuki Matsuzuka Tatsushi Mochiduki Eriko Wakita Meng WANG Yasunori Koda Faculty of Agriculture and Life science Hirosaki University3Bunkyo-choHirosaki 036-8561Japan The United Graduate School of Agricultural science Iwate UniversityMoriokaIwate 020-8550Japan National Institute of Vegitable and Tea science National Agriculture and Food Research Organization360 KusawaAnoTsu 514-2392Japan research Faculty of Agriculture Hokkaido UniversityKita-9 Nishi-9Kita-kuSapporo 060-8589Japan

Onion plants form spherical bulbs under long-day *** regulating bulb formation remain *** the course of chemical studies on the bulb formation,α-linolenic acid was isolated from onion extracts as an antibulbing substance,the amount of which was synchronized with the bulb *** allene oxide synthase inhibitor canceled the antibulbing activity ofα-linolenic acid,it was disclosed that jasmonic acid concerns this ***-activity-relationship study revealed that its(3R,7S)stereochemistry is necessary for showing its antibulbing *** is concluded that(3R,7S)-jasmonate derived fromα-linolenic acid actually participates in the regulation of bulb formation.

关键词： Onion(Allim cepa L.cv.Higuma) Isolation Bulb formation Antibulbing substance α-Linolenic acid Methyl jasmonate

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Monogenic gene therapy for glaucoma and optic nerve injury

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Neural Regeneration research 2025年第3期20卷 815-816页

作者： Chikako Harada Xiaoli Guo Takayuki Harada Visual research Project Tokyo Metropolitan Institute of Medical ScienceTokyoJapan

The prevalence of glaucoma, the second leading cause of global blindness, is increasing due to aging populations. In glaucoma, degeneration of the optic nerve and retinal ganglion cells(RGCs) causes visual field defec... 详细信息

关键词： visual glaucoma degeneration

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