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Shape design of cerium oxide nanoparticles for enhancement of enzyme mimetic activity in therapeutic applications

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Nano Research 2017年第1期10卷 199-217页

作者： tamaki Naganuma Research Center for Functional Materials National Institute for Materials Science 1- I Namiki Tsukuba Ibaraki Japan

Cerium oxide nanoparticles （CONPs）, widely used in catalytic applications owing to their robust redox reaction, are now being considered in therapeutic applications based on their enzyme mimetic properties such as catalase and super oxide dismutase （SOD） mimetic activities. In therapeutic applications, the emerging demand for CONPs with low cytotoxicity, high cost efficiency, and high enzyme mimetic capability necessitates the exploration of alternative synthesis and effective material design. This study presents a room temperature aqueous synthesis for low-cost production of shape-selective CONPs without potentially harmful organic substances, and additionally, investigates cell viability and catalase and SOD mimetic activities. This synthesis, at room temperature, produced CONPs with particular planes： {111}/{100} nanopolyhedra, {100} nano/submicron cubes, and {111}/{100} nanorods that grew in [110] longitudinal direction. Enzymatic activity assays indicated that nanopolyhedra with a high concentration of Ce4＋ ions promoted catalase mimetic activity, while nanocubes and nanorods with high Ce3＋ ion concentrations enhanced SOD mimetic activity. This is the first study indicating that shape and facet configuration design of CONPs, coupled with the retention of dominant, specific Ce valence states, potentiates enzyme mimetic activities. These findings may be utilized for CONP design aimed at enhancing enzyme mimetic activities in therapeutic applications.

关键词： super oxide dismutase(SOD) and catalasemimetic activity shape and facetconfiguration Ce valence states room temperature aqueoussynthesis

Bridging long gap peripheral nerve injury using skeletal muscle-derived multipotent stem cells

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Neural Regeneration Research 2014年第14期9卷 1333-1336页

作者： Tetsuro tamaki Muscle Physiology & Cell Biology Unit Department of Regenerative MedicineDivision of Basic Clinical ScienceTokai University School of Medicine Isehara Japan

Long gap peripheral nerve injuries usually reulting in life-changing problems for patients. Skeletal muscle derived-multipotent stem cells （Sk-MSCs） can differentiate into Schwann and perineurial/endoneurial cells, vascular relating pericytes, and endothelial and smooth muscle cells in the damaged peripheral nerve niche. Application of the Sk-MSCs in the bridging conduit for repairing long nerve gap injury resulted favorable axonal regeneration, which showing superior effects than gold standard therapy--healthy nerve autograft. This means that it does not need to sacrifice of healthy nerves or loss of related functions for repairing peripheral nerve injury.

关键词： peripheral nerve support cells Schwann cells perineurium endoneurium cytokine,paracrine effect blood vessel formation

Degradation behaviors of nonylphenol ethoxylates by isolated bacteria using improved isolation method

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Journal of Environmental Sciences 2008年第9期20卷 1025-1027页

作者： Hideyuki tamaki Yoichi Kamagata Institute for Biological Resources and Functions National Institute of Advanced Industrial Science and Technology

Nonylphenol ethoxylate (NPEO)-degrading bacteria were isolated from activated sludge using an improved isolation method, and the corresponding degradation behaviours were investigated. Eight NPEO-degrading strains distributed in genera Pseudomonas, Sphingomonas, Sphingobium, Cupriavidus, Ralstonia, Achromobacter, and Staphylococcus were acquired. The latter five genera have never been reported for the degradation of NPEOs. Four degradation patterns were observed for the eight pure strains. In pattern A, NPE...

关键词： nonylphenol ethoxylate (NPEO) biodegradation ssolation method

Therapeutic capacities of human and mouse skeletal muscle-derived stem cells for a long gap peripheral nerve injury

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Neural Regeneration Research 2017年第11期12卷 1811-1813页

作者： Tetsuro tamaki Muscle Physiology&Cell Biology Unit Department of Human Structure and FunctionTokai University School of Medicine143 ShimokasuyaIseharaKanagawaJapan

An overview of a long-gap peripheral nerve therapy： A long- gap peripheral nerve transection injury is an irreparable injury to the living body, and mostly leads to permanent loss of re- lated motor and sensory functions. In such long gap injuries, nerve end-to-end suture is physically impossible. Therefore, bridging a long nerve-gap is critical to re-establish adequate mechanical support for separated nerve ends, and prevent the diffusion of neurotrophic and neurotropic factors secreted by transected stumps （Deumens et al., 2010）.

关键词： Therapeutic capacities of human muscle-derived stem cells

Influence of volute distortion on the performance of turbocharger centrifugal compressor with vane diffuser

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Science China(Technological Sciences) 2013年第11期56卷 2778-2786页

作者： ZHENG XinQian JIN Lei tamaki Hideaki State Key Laboratory of Automotive Safety and Energy Tsinghua University Turbo Machinery and Engine Technology Department IHI Corporation

As the geometry of the volute of turbocharger compressor is non-axisymmetric,it causes a distortion at the outlet of the diffuser and influences the upstream components.A distortion model in which a pressure distortion was applied as outlet boundary condition was established to simulate the distortion induced by the *** turned out to be sufficient to impose a circumferentially asymmetric pressure distribution at the outlet of the diffuser to replace the *** on the distortion model which was verified,the influence of the amplitude of the distortion on the performance of centrifugal compressor was studied in *** results show that the distortion severely harms aerodynamic stability of the investigated *** larger the amplitude of the distortion,the worse the performance of the *** distortion induced by asymmetric volute propagates to upstream components and causes local flow separation at part of diffuser and impeller,and then causes the compressor *** the amplitude of the volute distortion is 10%,the stable flow range of the centrifugal compressor decreases to near *** authors’knowledge,the relationship between the compressor performance and distortion amplitude is first obtained quantitatively,which provides evidence to improve the performance of turbocharger compressor by decreasing the distortion induced by asymmetric volute.

关键词： turbocharger vane diffuser centrifugal compressor stability distortion

Environmental pressure rather than ongoing hybridization is responsible for an altitudinal cline in the morphologies of two oaks

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Journal of Plant Ecology 2020年第4期13卷 413-422页

作者： Ichiro tamaki Yae Yamada Gifu Academy of Forest Science and Culture 88 SodaiMinoGifu 501-3714Japan

Aims In a contact zone between related taxa,phenotypic variation can result from genetic and/or environmental *** study aimed to clarify the cause of phenotypic variation in leaf morphology of two Quercus crispula varieties—crispula(QCC)and mongolicoides(QCM)—in their contact zone along an altitudinal *** We measured 6 morphological traits of leaves and recorded genotypes of 13 nuclear microsatellite loci for 48 individuals in the contact zone and 24 individuals in each of the reference populations of QCC and *** constructed a model explaining the phenotypic variation(leaf morphology)in relation to environmental(altitude)and genetic(ancestry from the reference population)*** Findings Both morphological and genetic markers distinguished the two varieties in the reference populations *** were able to confirm the power of both morphological and genetic *** within the contact zone population had intermediate ancestry that was slightly biased to QCM ancestry,and the distribution of their morphologies overlapped with those of the two varieties in the reference *** effect of altitude on leaf morphological traits was significant,while that of ancestry was *** of ancestry and interclass heterozygosity in the contact zone population resembled those in F2 or later generation *** results indicate that in the contact zone between QCC and QCM,there is no ongoing hybridization,but environmental pressure has created an altitudinal gradient in morphological traits through phenotypic plasticity and/or variation in functional genes.

关键词： Quercus crispula Quercus mongolica leaf morphologies microsatellites hybrid zone

The Most Complete Pistosauroid Skeleton from the Triassic of Yunnan,China

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Acta Geologica Sinica(English Edition) 2008年第2期82卷 283-286页

作者： ZHAO Lijun tamaki SATO LI Chun Department of Earth Sciences Zhejiang University Hangzhou Zhejiang 310027 China Zhejing Museum of Natural History Hangzhou Zhejiang 310012 China Department of Natural Science Tokyo Gakugei University Nukui Kita-Machi 4-1-1 Koganei City Tokyo 184-8501 Japan Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Sciences Beijing 100044 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China

A new specimen discovered from the Falang Formation in northeastern Yunnan represents the most complete skeleton of Triassic pistosauroids. The new specimen is referred to Yunguisaurus Cheng et al., 2006 on the basis of the skull features, such as the presence of a separated nasal entering the external naris, a large pineal foramen located at the frontal/parietal suture and an interpterygoid vacuity with a narrow anterior extension. The new specimen differs from the type species of Yunguisaurus liae Cheng et al., 2006 in some aspects. Most of these differences can be attributed to ontogenetic variations. The new specimen is provisionally considered as Yunguisaurus cf. liae although its relatively short snout of the skull and slenderer hyoid may not be explained ontogenetically. Whether or not the new specimen represents a different taxon has to wait for a detailed study of the whole skeleton.

关键词： Pistosauroid Yunguisaurus complete skeleton Falang Formation late Middle Triassic,Yunnan

Effect of bent inlet pipe on the flow instability behavior of centrifugal compressors

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Chinese Journal of Aeronautics 2020年第8期33卷 2099-2109页

作者： Zhenzhong SUN Baotong WANG Xinqian ZHENG Tomoki KAWAKUBO Hideaki tamaki Ryuusuke NUMAKURA Department of Aerodynamics and Thermodynamics Institute for Aero EngineTsinghua UniversityBeijing 100084China Corporate Research&Development IHI CorporationYokohama 235-8501Japan State Key Laboratory of Automotive Safety and Energy School of Vehicle and MobilityTsinghua UniversityBeijing 100084China

Bent inlet pipes are often used in centrifugal compressors due to limited installation space,and an understanding of the effect on compressor stability is essential for safety and *** paper firstly investigates flow instability behaviors in two compressors,one with a straight inlet pipe and the other with an S-shaped bent *** detail,it analyzes the resulting flow fields,instability evolution paths and surge *** results show that the S-shaped pipe obviously affects the flow field at high mass flow rates,while reverse flow mainly influences the flow field at low mass flow *** flow first occurs at certain flow passages with a high pressure difference that is predominantly decided by the volute rather than the S-shaped bent *** addition,centrifugal compressors can tolerate reverse flow to some extent so that surge would not occur immediately if reverse flow occurs unless the reverse flow region extends circumferentially and radially to a sufficiently large *** the S-shaped pipe is not dominant in the creation and extension of reverse flow,it does not exacerbate the stability of the central compressor to a great *** but not least,the S-shaped pipe is noted to delay the occurrence of surge at 90%rotating speed,which suggests the possibility of improving compressor stability with bent inlet *** result differs from the conventional understanding that inlet distortion usually deteriorates compressor stability and emphasizes the particularity of centrifugal compressors.

关键词： Bent pipe Centrifugal compressor Flow field Flow instability Surge boundary

A novel experimental method to evaluate the impact of volute's asymmetry on the performance of a high pressure ratio turbocharger compressor

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Science China(Technological Sciences) 2012年第6期55卷 1695-1700页

作者： LIN Yun ZHENG XinQian JIN Lei tamaki Hideaki KAWAKUBO Tomoki State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing 100084China IHI Corporation TokyoJapan

All components of a turbocharger compressor are axisymmetric except for the spiral-shaped,gas-collecting overhung *** this paper,a novel experimental method to evaluate the impact of the volute's asymmetry on centrifugal compressor performance is proposed and applied to a high pressure-ratio turbocharger *** method can isolate the impact of the volute's asymmetry on the compressor performance for the first *** prove the considerable impact of the volute's asymmetry on the compressor performance,especially the stability and *** impact of the volute's asymmetry on compressor stability correlates with rotational speed and thus with the pressure ratio,constricting the stable flow range by up to 47 percent and decreasing the maximum efficiency by 4.8 percent at the design *** results provide evidence to exploit the potential of intrinsic non-axisymmetric flow induced by asymmetric volute to improve the performance of turbocharger compressor with a high pressure ratio.

关键词： high pressure-ratio turbocharger centrifugal compressor volute IC engine