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Physicochemical and Antimicrobial Properties of Gamma Irradiated HPMC-ZnO BNC Films

materials Today: Proceedings 2018年第10期5卷 21398-21405页

作者： B. Lakshmeesha Rao R. Madhukumar K. Sharath Chandra R. Neelakandan Youjiang Wang Y. Sangappa Department of Studies in Physics Mangalore University Mangalagangotri Mangalore 574 199 India Department of Bioscience Mangalore University Mangalagangotri Mangalore 574 199 India Department of Textile Technology Anna University Chennai 600 025 India School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA 30332 USA

This work presents the effect of gamma irradiation on the physicochemical, mechanical, thermal and antibacterial properties of HPMC/ZnO bionanocomposite (BNC) films exposed to a Cobalt – 60 gamma source of average energy 1.25 MeV for various (0-250 kGy) doses. X-ray diffraction (XRD) study revealed that the crystallite size ( L XRD in Å) and crystallinity of the nanocomposites significantly increased up to 100 kGy, then decreased as the radiation dose increased. At lower dosage nanocomposites showed improved Young’s modulus and load capacity, and at higher dosage, the decrease in tensile strength ( TS ) and percentage elongation at break ( E ), suggesting degradation process in the HPMC matrix. Contact angle (CA) studies demonstrated HPMC/ZnO nanocomposites are more hydrophilic after gamma irradiation. The antibacterial activity of HPMC/ZnO nanocomposite films were effective even after gamma irradiation, making it suitable for food and pharmaceutical packaging applications

关键词： ZnO nanoparticles HPMC Structural properties Tensile strength Surface properties Antibacterial activity Active packaging

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Gate tunable giant anisotropic resistance in ultra-thin GaTe

arXiv

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arXiv 2019年

作者： Wang, Hanwen Chen, Mao-Lin Zhu, Mengjian Wang, Yaning Dong, Baojuan Sun, Xingdan Zhang, Xiaorong Cao, Shimin Li, Xiaoxi Huang, Jianqi Zhang, Lei Liu, Weilai Sun, Dongming Ye, Yu Yang, Teng Guo, Huaihong Qin, Chengbing Xiao, Liantuan Zhang, Jing Chen, Jianhao Han, Zheng Vitto Zhang, Zhidong Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang110016 China School of Material Science and Engineering University of Science and Technology of China Anhui230026 China College of Advanced Interdisciplinary Studies National University of Defense Technology Changsha410073 China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser Spectroscopy Shanxi University Taiyuan030006 China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-Electronics Shanxi University Taiyuan030006 China Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan030006 China International Center for Quantum Materials School of Physics Peking University Beijing100871 China State Key Lab for Mesoscopic Physics School of Physics Peking University Beijing China Collaborative Innovation Center of Quantum Matter Beijing100871 China College of Sciences Liaoning Shihua University Fushun113001 China

In crystals, the duplication of atoms often follows different periodicity along different directions. It thus gives rise to the so called anisotropy, which is usually even more pronounced in two dimensional (2D) materials due to the absence of z dimension. Indeed, in the emerging 2D materials, electrical anisotropy has been one of the focuses in recent experimental efforts.[1-8] However, key understandings of the in-plane anisotropic resistance in low-symmetry 2D materials, as well as demonstrations of model devices taking advantage of it, have proven difficult. Here, we show that, in few-layered semiconducting GaTe, electrical conductivity along x and y directions of the 2D crystal can be gate tuned from a ratio of less than one order to as large as 103. This effect is further demonstrated to yield an anisotropic memory resistor behaviour in ultra-thin GaTe, when equipped with an architecture of van der Waals floating gate. Our findings of gate tunable giant anisotropic resistance (GAR) effect pave the way for potential applications in nano-electronics such as multifunctional directional memories in the 2D limit. Copyright © 2019, The Authors. All rights reserved.

关键词： Anisotropy

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Three-dimensional bioprinted glioblastoma microenvironments model cellular dependencies and immune interactions

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细胞研究（英文版） 2020年第10期30卷 833-853页

作者： Min Tang Qi Xie Ryan C.Gimple Zheng Zhong Trevor Tam Jing Tian Reilly L.Kidwell Qiulian Wu Briana C.Prager Zhixin Qiu Aaron Yu Zhe Zhu Pinar Mesci Hui Jing Jacob Schimelman Pengrui Wang Derrick Lee Michael H.Lorenzini Deobrat Dixit Linjie Zhao Shruti Bhargava Tyler E.Miller Xueyi Wan Jing Tang Bingjie Sun Benjamin F.Cravatt Alysson R.Muotri Shaochen Chen Jeremy N.Rich Department of NanoEngineering University of California San Diego 9500 Gilman Drive La Jolla CA 92093 USA Division of Regenerative Medicine Department of MedicineUniversity of California San Diego La Jolla CA 92037 USA Sanford Consortium for Regenerative Medicine 2880 Torrey Pines Scenic Drive La Jolla CA 92037 USA School of Life Sciences Westlake University Hangzhou Zhejiang 310024 China Key Laboratory of Growth Regulation and Translation Research of Zhejiang Province School of Life Sciences Westlake University Hangzhou Zhejiang 310024 China Institute of Basic Medical Sciences Westlake Institute for Advanced Study Hangzhou Zhejiang 310024 China Department of Pathology Case Western University Cleveland OH USA Department of Cellular and Molecular Medicine Cleveland Clinic Lerner Research Institute Cleveland OHUSA Department of Cellular & Molecular Medicine School of Medicine University of California San Diego La Jolla CA 92093 USA Department of Pediatrics/Rady Children's Hospital San Diego School of Medicine University of California San Diego ka Jolla CA 92093 USA The Department of Chemistry and The Skaggs Institute for Chemical Biology The Scripps Research Institute La Jolla CA 92037 USA Materials Science and Engineering Program University of California San Diego 9500 Gilman Drive La Jolla CA 92093 USA Department of Pathology and Center for Cancer Research Massachusetts General Hospital and Harvard Medical School Boston MA 02114 USA Division of Biological Sciences University of California San Diego La Jolla CA 92093 USA Kavli Institute for Brain and Mind University of California San Diego La JollaCA 92093 USA Center for Academic Research and Training in Anthropogeny (CARTA) La Jolla CA 92093 USA Department of Bioengineering University of California San Diego 9500 Gilman Drive La Jolla CA 92093 USA Department of Neurosciences School of Medicine University of California San Diego La Jolla CA 92037 USA

Brain tumors are dynamic complex ecosystems with multiple cell *** model the brain tumor microenvironment in a reproducible and scalable system,we developed a rapid three-dimensional (3D) bioprinting method to construct clinically relevant biomimetic tissue *** recurrent glioblastoma,macrophages/microglia prominently contribute to the tumor *** parse the function of macrophages in 3D,we compared the growth of glioblastoma stem cells (GSCs) alone or with astrocytes and neural precursor cells in a hyaluronic acid-rich hydrogel,with or without *** constructs integrating macrophage recapitulate patient-derived transcriptional profiles predictive of patient survival,maintenance of stemness,invasion,and drug ***-genome CRISPR screening with bioprinted complex systems identified unique molecular dependencies in GSCs,relative to sphere *** bioprinted models serve as a scalable and physiologic platform to interrogate drug sensitivity,cellular crosstalk,invasion,context-specific functional dependencies,as well as immunologic interactions in a speciesmatched neural environment.

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ELIMÄKI Locus Is Required for Vertical Proprioceptive Response in Birch Trees

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Current Biology 2020年第4期30卷 589-599.e5页

作者： Alonso-Serra, Juan Shi, Xueping Peaucelle, Alexis Rastas, Pasi Bourdon, Matthieu Immanen, Juha Takahashi, Junko Koivula, Hanna Eswaran, Gugan Muranen, Sampo Help, Hanna Smolander, Olli-Pekka Su, Chang Safronov, Omid Gerber, Lorenz Salojärvi, Jarkko Hagqvist, Risto Mähönen, Ari Pekka Helariutta, Ykä Nieminen, Kaisa Organismal and Evolutionary Biology Research Program Faculty of Biological and Environmental Sciences Viikki Plant Science Centre University of Helsinki Helsinki 00014 Finland Institute of Biotechnology HiLIFE University of Helsinki Helsinki 00014 Finland Key Laboratory of Horticultural Plant Biology of Ministry of Education College of Horticulture and Forestry Sciences Huazhong Agricultural University Wuhan 430070 China Sainsbury Laboratory University of Cambridge Cambridge CB2 1LR United Kingdom Institut Jean-Pierre Bourgin INRA AgroParisTech CNRS Université Paris-Saclay Versailles 78000 France Production Systems Natural Resources Institute Finland (Luke) Helsinki 00790 Finland Umeå Plant Science Center Department of Forest Genetics and Plant Physiology Swedish University of Agricultural Sciences Umeå 901 83 Sweden Department of Food and Nutrition Faculty of Agriculture and Forestry University of Helsinki Helsinki 00014 Finland Department of Physics Division of Materials Sciences X-ray Laboratory University of Helsinki Helsinki 00014 Finland Department of Chemistry and Biotechnology School of Science Tallinn University of Technology Tallinn Estonia Genome Institute of Singapore Singapore 138672 Singapore Singapore Centre for Environmental Life Sciences Engineering Nanyang Technological University Singapore 63755 Singapore

Tree architecture has evolved to support a top-heavy above-ground biomass, but this integral feature poses a weight-induced challenge to trunk stability. Maintaining an upright stem is expected to require vertical proprioception through feedback between sensing stem weight and responding with radial growth. Despite its apparent importance, the principle by which plant stems respond to vertical loading forces remains largely unknown. Here, by manipulating the stem weight of downy birch (Betula pubescens) trees, we show that cambial development is modulated systemically along the stem. We carried out a genetic study on the underlying regulation by combining an accelerated birch flowering program with a recessive mutation at the ELIMÄKI locus (EKI), which causes a mechanically defective response to weight stimulus resulting in stem collapse after just 3 months. We observed delayed wood morphogenesis in eki compared with WT, along with a more mechanically elastic cambial zone and radial compression of xylem cell size, indicating that rapid tissue differentiation is critical for cambial growth under mechanical stress. Furthermore, the touch-induced mechanosensory pathway was transcriptionally misregulated in eki, indicating that the ELIMÄKI locus is required to integrate the weight-growth feedback regulation. By studying this birch mutant, we were able to dissect vertical proprioception from the gravitropic response associated with reaction wood formation. Our study provides evidence for both local and systemic responses to mechanical stimuli during secondary plant development. Alonso-Serra et al. use birch trees to explore vertical proprioception, the growth response of stems to changes in aerial body weight. They identify a genetic locus, which is required for this developmental response, and study the consequences of cambial growth under mechanical stress. © 2019 Elsevier Ltd

关键词： Betula forward genetics mechanosensing proprioception radial growth trees wood formation

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Correction to: Why nature matters: A systematic review of intrinsic, instrumental, and relational values

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Bioscience 2025年第2期75卷 188页

作者： Austin Himes Barbara Muraca Christopher B Anderson Simone Athayde Thomas Beery Mariana Cantú-Fernández David González-Jiménez Rachelle K Gould A P Hejnowicz Jasper Kenter Dominic Lenzi Ranjini Murali Unai Pascual Christopher Raymond Annalie Ring Kurt Russo Aibek Samakov Sanna Stålhammar Henrik Thorén Egleé Zent Department of Forestry Forest and Wildlife Research Center Mississippi State University Starkville Mississippi United States. Department of Philosophy and the Environmental Studies Program at the University of Oregon Eugene Oregon United States. Instituto de Ciencias Polares Ambiente y Recursos Naturales at the Universidad Nacional de Tierra del Fuego Ushuaia Tierra del Fuego Argentina. Centro Austral de Investigaciones Cientificas Consejo Nacional de Investigaciones Científicas y Técnicas Ushuaia Tierra del Fuego Argentina. Department of Global and Sociocultural Studies. Kimberly Green Latin American and Caribbean Center at Florida International University Miami Florida United States. School of Natural Science Sustainable Multifunctional Landscapes at Kristianstad University Kristianstad Sweden. Instituto de Investigaciones en Ecosistemas y Sustentabilidad at the Universidad Nacional Autónoma de México Ciudad de Mexico Mexico. Instituto de Investigaciones en Ecosistemas y Sustentabilidad at the Universidad Nacional Autónoma de México Ciudad de Mexico. Ceiba Centro de Formación y Desarrollo Oaxaca Mexico. Rubenstein School of Environment and Natural Resources at the University of Vermont Burlington Vermont United States. Global Change Institute School of Geosciences at the University of Edinburgh Scotland United Kingdom. School of Engineering at Newcastle University Newcastle upon Tyne England United Kingdom. Department of Environment and Geography at the University of York York England United Kingdom. Aberystwyth Business School at Aberystwyth University Aberystwyth Wales United Kingdom. Ecologos Research Ltd Aberystwyth. Department of Philosophy at the University of Twente Enschede the Netherlands. Geography Department at the Humboldt-Universitat zu Berlin Berlin Germany. Snow Leopard Trust Seattle Washington United States. Terrestrial Ecosystems Research Line at the Basque Centre for Climate Change LeioaSpain. Ikerbasque Basque Foundation for Science Bilbao

[This corrects the article DOI: 10.1093/biosci/biad109.].

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Laser micro-ablated multi-point side-firing optical fiber for deep-tissue light delivery 30

Laser micro-ablated multi-point side-firing optical fiber fo...

引用

30th Annual Conference of the IEEE Photonics Society, IPC 2017

作者： Nguyen, Hoang ParvezArnob, Masud Shih, Wei-Chuan Program of Materials Science and Engineering University of Houston TX77204 United States Department of Electrical and Computer Engineering University of Houston TX77204 United States Department of Biomedical Engineering University of Houston TX77204 United States Department of Chemistry University of Houston TX77204 United States

ISBN: (纸本)9781509065783

A compact light delivery device capable of delivering light to multiple desired locations is essential for many biomedical applications. Here, we demonstrate the use of laser micro-ablation to create controllable conicalshaped cavities on optical fiber to enable a multi-point side-firing configuration using a single fiber. © 2017 IEEE.

关键词： Tissue

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Observation of transition from semiconducting to metallic ground state in high-quality single crystalline FeSi

arXiv

引用

arXiv 2018年

作者： Fang, Y. Ran, S. Xie, W. Maple, M.B. Materials Science and Engineering Program University of California San Diego La JollaCA92093 United States Center for Advanced Nanoscience University of California San Diego La JollaCA92093 United States Department of Physics University of California San Diego La JollaCA92093 United States Department of Materials Science and Engineering University of Maryland Collage Park20742 United States Department of Chemistry Louisiana State University Baton RougeLA70803 United States

We report anomalous physical properties of single-crystalline FeSi over a wide temperature range 1.8-400 K. X-ray diffraction, specific heat, and magnetization measurements indicate that the FeSi crystals synthesized in this study are of high quality with a very low concentration of magnetic impurities (∼0.01%). The electrical resistivity ρ(T) can be described by activated behavior with an energy gap ∆ = 57 meV between 67 K and 150 K. At temperatures below 67 K, ρ(T) is significantly lower than an extrapolation of the activated behavior, and the Hall coefficient and magneto-resistivity undergo a sign change in this region. At ∼19 K, a transition from semiconducting to metallic-like behavior is observed with deceasing temperature. Whereas the transition temperature is very robust in a magnetic field, the magnitude of the resistivity below ∼30 K is very sensitive to magnetic field. There is no indication of a bulk phase transition or onset of magnetic order in the vicinity of either 67 K or 19 K from specific heat and magnetic susceptibility measurements. These measurements provide evidence for a conducting surface state in FeSi at low temperatures. Copyright © 2018, The Authors. All rights reserved.

关键词： Magnetic fields

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Cover Feature: Electrochemical Characterization of Current-Producing Human Oral Pathogens by Whole-Cell Electrochemistry (ChemElectroChem 9/2020)

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ChemElectroChem 2020年第9期7卷 1954-1954页

作者： Divya Naradasu Dr. Alexis Guionet Dr. Toshinori Okinaga Dr. Tatsuji Nishihara Dr. Akihiro Okamoto International Center for Materials Nanoarchitectonics (WPI-MANA) National Institute for Materials Science (NIMS) 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan Department of Advanced Interdisciplinary Studies RCAST Graduate School of Engineering The University of Tokyo 4-6-1 Komaba Meguro-ku Tokyo 153-8904 Japan Department of Bacteriology Osaka Dental University 8-1 Kuzuha-hanazano-cho Hirakata-city Osaka 573-1121 Japan Division of Infections and Molecular Biology Department of Health Promotion Science of Health Improvement Kyushu Dental University 2-6-1 Manazuru Kokurakita-ku Kitakyushu 803-8580 Japan PRIME Japan Agency for Medical Research and Development (AMED) Tsukuba Ibaraki 305-0074 Japan Center for Sensor and Actuator Material National Institute for Materials Science (NIMS) 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan Graduate School of Chemical Sciences and Engineering Hokkaido University 5-8 Jonishi Kita Ward Sapporo Hokkaido 060-0808 Japan

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Review of Cellulose Nanocrystal-based Fluorophore materials and Their Application in Metal Ion Detection

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Paper And Biomaterials 2018年第4期3卷 45-61页

作者： Ya Wang Alain Dufresne Peter R. Chang XiaoZhou Ma Jin Huang School of Chemistry and Chemical Engineering Joint International Research Laboratory of Biomass-Based Macromolecular Chemistry and Materials Southwest University Chongqing 400715 China Université Grenoble Alpes CNRS Grenoble INP LGP2 F-38000 Grenoble France Bioproducts and Bioprocesses National Science Program Agriculture and Agri-Food Canada 107 Science Place Saskatoon SK S7N0X2 Canada

Cellulose nanocrystals （CNCs）, a unique and promising natural material extracted from native cellulose, have attracted considerable attention owing to their physical properties and special surface chemistry. This review focuses on chemical conjugation strategies that can be used for preparation of ？uorescent-molecule labeled CNCs and the development of biomaterials. Furthermore, their application in the detection of metal ions and future development prospects are discussed. We hope to provide a clear view of the strategies for surface fluorescent modifcation of CNCs and their application in detection of metal ions.

关键词： fluorescent cellulose nanocrystals detection of metal ions sensors optical imaging biomaterial

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Better Together: Early Career Aquatic Scientists Forge New Connections at Eco-DAS XV

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Limnology and Oceanography Bulletin 2023年第3期32卷

作者： Olivia J. Graham Alia Al-Haj Eleanor C. Arrington Emily R. Arsenault Carolina C. Barbosa Kadir Bice Evie Brahmstedt S. River D. Bryant Xun Cai Stacy Calhoun-Grosch Joshua Culpepper Katherine Dale Derek J. Detweiler Katlin D. Doughty Kyle A. Emery Kara Gadeken Laura Griffiths Atefeh Hosseini Catriona Jones Hadis Miraly Alexander W. Mott Karla Münzner Igor Ogashawara Carly R. Olson Joseph S. Rabaey Walter A. Rich Phoenix A. Rogers Meredith Evans Seeley Lorena Selak Qipei Shangguan Kelsey J. Solomon Xinyu Sun Spencer J. Tassone Audrey Thellman John Tracey Jilian Xiong Tianfei Xue Department of Ecology and Evolutionary Biology Cornell University Ithaca New York USA Smithsonian Environmental Research Center Edgewater Maryland USA Marine Science Institute University of California Santa Barbara California USA Department of Environmental Biology State University of New York College of Environmental Science and Forestry Syracuse New York USA Department of Zoology and Physiology University of Wyoming Laramie Wyoming USA Department of Marine Sciences University of Georgia Athens Georgia USA New York State Water Resources Institute Cornell University Ithaca New York USA Department of Biology University of Louisiana at Lafayette Lafayette Louisiana USA ORISE Research Participation Program at the U.S. Environmental Protection Agency Chesapeake Bay Program Office Annapolis Maryland USA Virginia Institute of Marine Science William & Mary Gloucester Point Virginia USA Department of Biology York University Toronto Canada Department of Biology East Carolina University Greenville North Carolina USA Department of Environmental and Life Sciences Trent University Peterborough Ontario Canada Geography Department University of California Los Angeles California USA School of Marine and Atmospheric Sciences Stony Brook University Stony Brook New York USA Griffith University Gold Coast Queensland Australia Department of Environmental Engineering University of Kansas Lawrence Kansas USA Department of Forestry and Natural Resources Purdue University West Lafayette Indiana USA Department of Environmental Science and Policy George Mason University Fairfax Virginia USA Department of Ecology and Genetics Uppsala University Sweden Leibniz Institute of Freshwater Ecology and Inland Fisheries Berlin Germany School of Natural Resources University of Nebraska-Lincoln Lincoln Nebraska USA Department of Ecology Evolution and Behavior University of Minnesota Twin Cities St. Paul Minnesota USA Red Sea Research Center King Abdullah University

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