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The mTORC1 complex in pre-osteoblasts regulates whole-body energy metabolism independently of osteocalcin

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Bone Research 2021年第1期9卷 109-125页

作者： Pawanrat Tangseefa Sally K.Martin Peck Yin Chin james Breen Chui Yan mah Paul A.Baldock Gary A.Wittert Amanda J.Page Christopher G.Proud Stephen Fitter Andrew C.W.Zannettino Adelaide Medical School Faculty of Health and Medical ScienceUniversity of AdelaideAdelaide5005 SAAustralia Cancer Program Precision Medicine ThemeSouth Australian Health and Medical Research InstituteAdelaide5000 SAAustralia Research Centre for Reproductive Health School of Paediatrics and Reproductive HealthUniversity of AdelaideAdelaide5005 SAAustralia Computational&Systems Biology program Precision Medicine ThemeSouth Australian Health and Medical Research InstituteAdelaide5000 SAAustralia Robinson Research Institute University of AdelaideAdelaideSA 5005Australia Bioinformatics Hub University of AdelaideAdelaideSA 5005Australia Freemasons Foundation Centre for Men’s Health University of AdelaideAdelaide5005 SAAustralia Skeletal Metabolism Group Garvan Institute of Medical ResearchSydney2010 NSWAustralia Nutrition Diabetes&Metabolism ProgramLifelong Health ThemeSouth Australian Health and Medical Research InstituteAdelaide5000 SAAustralia School of Biological Sciences University of AdelaideAdelaide5005 SAAustralia Central Adelaide Local Health Network AdelaideSAAustralia

Overnutrition causes hyperactivation of mTORC1-dependent negative feedback loops leading to the downregulation of insulin signaling and development of insulin *** osteoblasts(OBs),insulin signaling plays a crucial role in the control of systemic glucose *** utilized mice with conditional deletion of Rptor to investigate how the loss of mTORC1 function in OB affects glucose metabolism under normal and overnutrition dietary *** to the controls,chow-fed Rptorob−/−mice had substantially less fat mass and exhibited adipocyte ***,upon feeding with high-fat diet,mice with pre-and post-natal deletion of Rptor in OBs were protected from diet-induced obesity and exhibited improved glucose metabolism with lower fasting glucose and insulin levels,increased glucose tolerance and insulin *** leanness and resistance to weight gain was not attributable to changes in food intake,physical activity or lipid absorption but instead was due to increased energy expenditure and greater whole-body substrate ***-seq revealed an increase in glycolysis and skeletal insulin signaling pathways,which correlated with the potentiation of insulin signaling and increased insulin-dependent glucose uptake in Rptorknockout ***,these findings point to a critical role for the mTORC1 complex in the skeletal regulation of wholebody glucose metabolism and the skeletal development of insulin resistance.

关键词： metabolism mTORC1 homeostasis

SnO2-reduced graphene oxide nanoribbons as anodes for lithium ion batteries with enhanced cycling stability

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Nano Research 2014年第9期7卷 1319-1326页

作者： Lei Li Anton Kovalchuk james M. Tour Department of Chemistry Rice University 6 I00 Main Street Houston Texas 77005 USA Richard E. Smalley Institute for Nanoscale Science and Technology Rice University 6100 Main Street Houston Texas 77005 USA Department of Materials Science and NanoEngineering Rice University 6100 Main Street Houston Texas 77005 USA

A nanocomposite material of SnO2-reduced graphene oxide nanoribbons has been developed. In this composite, the reduced graphene oxide nanoribbons are uniformly coated by nanosized SnO2 that formed a thin layer of SnO2 on the surface. When used as anodes in lithium ion batteries, the composite shows outstanding electrochemical performance with the high reversible discharge capacity of 1,027 mah/g at 0.1 A/g after 165 cycles and 640 mah/g at 3.0 A/g after 160 cycles with current rates varying from 0.1 to 3.0 A/g and no capacity decay after 600 cycles compared to the second cycle at a current density of 1.0 A/g. The high reversible capacity, good rate performance and excellent cycling stability of the composite are due to the synergistic combination of electrically conductive reduced graphene oxide nanoribbons and SnO2, The method developed here is practical for the large-scale development of anode materials for lithium ion batteries.

关键词： lithium ion battery tin oxide graphene oxide nanoribbons energy storage

Preparation of carbon-coated iron oxide nanoparticles dispersed on graphene sheets and applications as advanced anode materials for lithium-ion batteries

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Nano Research 2014年第4期7卷 502-510页

作者： Huilong Fei Zhiwei Peng Lei Li Yang Yang Wei Lu Errol L. G. Samuel Xiujun Fan james M. Tour Department of Chemistry Rice University 6100 Main Street Houston Texas 77005 USA Richard E. Smalley Institute for Nanoscale Science and Technology Rice University 6100 Main Street Houston Texas 77005 USA Department of Materials Science and NanoEngineering Rice University 6100 Main Street Houston Texas 77005 USA

We report a novel chemical vapor deposition （CVD） based strategy to synthesize carbon-coated Fe203 nanoparticles dispersed on graphene sheets （Fe2Og@C@G）. Graphene sheets with high surface area and aspect ratio are chosen as space restrictor to prevent the sintering and aggregation of nanoparticles during high temperature treatments （800 ℃）. In the resulting nanocomposite, each individual Fe2O3 nanoparticle （5 to 20 nm in diameter） is uniformly coated with a continuous and thin （two to five layers） graphitic carbon shell. Further, the core-shell nanoparticles are evenly distributed on graphene sheets. When used as anode materials for lithium ion batteries, the conductive-additive-free Fe2OB@C@G electrode shows outstanding Li＋ storage properties with large reversible specific capacity （864 mah/g after 100 cycles）, excellent cyclic stability （120% retention after 100 cycles at 100 mA/g）, high Coulombic efficiency （-99%）, and good rate capability.

关键词： Fe2O3 nanoparticles carbon coating graphene chemical vapor deposition(CVD) anode lithium ion batteries

Battery state-of-charge estimation using machine learning analysis of ultrasonic signatures

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Energy and AI 2022年第4期10卷 60-72页

作者： Elias Galiounas Tom G.Tranter Rhodri E.Owen james B.Robinson Paul R.Shearing Dan J.L.Brett Electrochemical Innovation Lab Department of Chemical EngineeringUniversity College LondonLondonWC1E 7JEUK The Faraday Institution Quad OneBecquerel AvenueHarwell CampusDidcotOX11 The Alan Turing Institute British Library96 Euston RoadLondon NW12DB

The potential of acoustic signatures to be used for State-of-Charge(SoC)estimation is demonstrated using artificial neural network regression *** approach represents a streamlined method of processing the entire acoustic waveform instead of performing manual,and often arbitrary,waveform peak *** applications where computational economy is prioritised,simple metrics of statistical significance are used to formally identify the most informative waveform *** alone can be exploited for SoC *** is further shown that signal portions representing both early and late interfacial reflections can correlate highly with the SoC and be of predictive value,challenging the more common peak selection methods which focus on the *** later echoes represent greater through-thickness coverage,and are intuitively more information-rich,their presence is not *** waveform treatment offers a more robust approach to correlating acoustic signatures to electrochemical *** is further demonstrated that transformation into the frequency domain can reduce the dimensionality of the problem significantly,while also improving the estimation *** importantly,it is shown that acoustic signatures can be used as sole model inputs to produce highly accurate SoC estimates,without any complementary voltage *** makes the method suitable for applications where redundancy and diversification of SoC estimation approaches is *** is obtained experimentally from a 210 mah LiCoO2/graphite pouch *** estimation errors as low as 0.75%are achieved on a SoC scale of 0-100%.

关键词： Battery diagnostics Ultrasonic battery monitoring Acoustic battery inspection Mechanical-electrochemical correlation Machine learning Artificial neural networks

Preparation and Performance of Short Carbon Fiber and Flake Graphene Reinforced Polycarbonate Composites: Effects of Different Tougheners

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Journal of Materials Science and Chemical Engineering 2018年第7期6卷 81-89页

作者： Zhixing Yu Yu Bai Yingcheng Li Wei Wang james H. Wang R & D Division for Synthetic Polymers Sinopec Shanghai Research Institute of Petrochemical Technology Shanghai China

Different tougheners including methyl methacrylate-butadiene-styrene terpolymer (MBS, core-shell type), maleic anhydride (mah) grafted ethylene-octene copolymer (EOM), and mah grafted polyethylene wax (PEM) were investigated for toughening the polycarbonate (PC) composites reinforced by short carbon fiber (SCF) and flake graphene (FG). The effects of tougheners on the preparation, thermal conductivity and mechanical properties of PC composites were studied. Scanning electron microscopy was used for characterizing the impact fracture surfaces of the composites. The results showed that introducing tougheners into the carbon reinforced PC composites was beneficial to improving the processability, and PEM was more effective than EOM and MBS. Meanwhile, the through-thickness and the in-plan thermal conductivity decreased to some degree due to the isolated island effects of tougheners. Moreover, the brittle PC composites with high flexural stress could be easily toughened by tougheners. In contrast, PEM had better toughening function than EOM and MBS, and correspondingly, the stiffness of the composites was the lowest for the PEM toughened systems. The fractography revealed that dense and uniformly distributed carbon fillers dispersed in matrix PC and circular cavities coexisted in the composites. The naked fiber length gradually increased as the ductility of composite materials improved.

关键词： Toughener Processability Thermal Conductivity Mechanical Property Fractography

玻璃纤维增强TPVA/PBST复合材料的制备及性能

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石油化工 2022年第1期51卷 37-44页

作者：于志省王洪学李应成肖田鹏飞胡圳周炳中国石化上海石油化工研究院上海201208

研究了短玻璃纤维(SGF)增强热塑性聚乙烯醇(TPVA)/聚丁二酸对苯二甲酸丁二醇酯(PBST)复合材料的改性机理、复合材料的热学及力学性能,并对复合材料中玻璃纤维(GF)的尺寸及分布进行了分析。实验结果表明,马来酸酐接枝乙烯-乙酸乙烯酯共聚... 详细信息

研究了短玻璃纤维(SGF)增强热塑性聚乙烯醇(TPVA)/聚丁二酸对苯二甲酸丁二醇酯(PBST)复合材料的改性机理、复合材料的热学及力学性能,并对复合材料中玻璃纤维(GF)的尺寸及分布进行了分析。实验结果表明,马来酸酐接枝乙烯-乙酸乙烯酯共聚物(EVA-g-mah)与硅烷偶联剂能够有效增容TPVA/PBST复合材料,引入EVA-g-mah有利于提高组分之间的相容性和复合材料的韧性,而SGF则赋予复合材料优异的热稳定性;SGF用量增加,复合材料的拉伸强度、弯曲强度及模量提高,熔融流动性下降,韧性和断裂伸长率降低,复合材料在SGF用量为20.0%~30.0%(w)时发生韧-脆转变。SGF用量低时,复合材料中GF的平均尺度较大、分布较窄,可诱导TPVA结晶;SGF用量高时,GF的平均尺度减小、分布变宽,易导致TPVA结晶不完全或缺陷。

关键词：热塑性聚乙烯醇聚丁二酸-对苯二甲酸丁二酯短玻璃纤维结晶性能力学性能