检索结果-内蒙古大学图书馆

Expression of concern: Microchip-based structure determination of low-molecular weight proteins using cryo-electron microscopy

引用

Nanoscale 2024年第9期16卷 4919页

作者： Michael A Casasanta G M Jonaid Liam Kaylor William Y Luqiu Maria J Solares Mariah L Schroen William J Dearnaley Jarad Wilson Madeline J Dukes Deborah F Kelly Department of Biomedical Engineering Pennsylvania State University University Park PA 16802 USA. Debkelly@psu.edu. Materials Research Institute Pennsylvania State University University Park PA 16802 USA. Bioinformatics and Genomics Graduate Program Huck Institutes of the Life Sciences Pennsylvania State University University Park PA 16802 USA. Molecular Cellular and Integrative Biosciences Graduate Program Huck Institutes of the Life Sciences Pennsylvania State University University Park PA 16802 USA. Department of Electrical and Computer Engineering Duke University Durham NC 27708 USA. RayBiotech Life Peachtree Corners GA 30092 USA. Applications Science Protochips Inc. Morrisville NC 27560 USA.

Expression of concern for 'Microchip-based structure determination of low-molecular weight proteins using cryo-electron microscopy' by Michael A. Casasanta , , 2021, , 7285-7293, https://***/10.1039/D1NR00388G.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Phase equilibrium of water with hexagonal and cubic ice using the SCAN functional

arXiv

引用

arXiv 2021年

作者： Piaggi, Pablo Miguel Panagiotopoulos, Athanassios Z. Debenedetti, Pablo G. Car, Roberto Department of Chemistry Princeton University PrincetonNJ08544 United States Department of Chemical and Biological Engineering Princeton University PrincetonNJ08544 United States Princeton Institute for the Science and Technology of Materials Princeton University PrincetonNJ08544 United States Department of Physics Princeton University PrincetonNJ08544 United States Program in Applied and Computational Mathematics Princeton University PrincetonNJ08544 United States

Machine learning models are rapidly becoming widely used to simulate complex physicochemical phenomena with ab initio accuracy. Here, we use one such model as well as direct density functional theory (DFT) calculations to investigate the phase equilibrium of water, hexagonal ice (Ih), and cubic ice (Ic), with an eye towards studying ice nucleation. The machine learning model is based on deep neural networks and has been trained on DFT data obtained using the SCAN exchange and correlation functional. We use this model to drive enhanced sampling simulations aimed at calculating a number of complex properties that are out of reach of DFT-driven simulations and then employ an appropriate reweighting procedure to compute the corresponding properties for the SCAN functional. This approach allows us to calculate the melting temperature of both ice polymorphs, the driving force for nucleation, the heat of fusion, the densities at the melting temperature, the relative stability of ice Ih and Ic, and other properties. We find a correct qualitative prediction of all properties of interest. In some cases, quantitative agreement with experiment is better than for state-of-the-art semiempirical potentials for water. Our results also show that SCAN correctly predicts that ice Ih is more stable than ice Ic. Copyright © 2021, The Authors. All rights reserved.

关键词： Ice

来源：评论

学校读者我要写书评

暂无评论

Elastic colloidal monopoles and reconfigurable self-assembly in liquid crystals

arXiv

引用

arXiv 2020年

作者： Yuan, Ye Liu, Qingkun Senyuk, Bohdan Smalyukh, Ivan I. Department of Physics University of Colorado BoulderCO80309 United States Department of Electrical Computer and Energy Engineering Materials Science and Engineering Program and Soft Materials Research Center University of Colorado BoulderCO80309 United States Renewable and Sustainable Energy Institute National Renewable Energy Laboratory University of Colorado BoulderCO80309 United States

Monopole-like electrostatic interactions are ubiquitous in biology1 and condensed matter2-4, but they are often screened by counter-ions and cannot be switched from attractive to repulsive. In colloidal science, where the prime goal is to develop colloidal particles2,3 that mimic and exceed the diversity and length-scales of atomic and molecular assembly, electrostatically charged particles cannot change the sign of their surface charge or transform from monopoles to higher-order multipoles4. In liquid-crystal colloids5-7, elastic interactions between particles arise to minimize the free energy associated with elastic distortions in the long-range alignment of rod-like molecules around the particles5. In dipolar6,8, quadrupolar8-12 and hexadecapolar13 nematic colloids, the symmetries of such elastic distortions mimic both electrostatic multipoles14 and the outmost occupied electron shells of atoms7,15,16. Electric and magnetic switching17,18, spontaneous transformations19 and optical control20 of elastic multipoles, as well as their interactions with topological defects and surface boundary conditions, have been demonstrated in such colloids21-23. However, it has long been understood5,24 that elastic monopoles should relax to uniform or higher-order multipole states because of the elastic torques that they induce5,7. Here we develop nematic colloids with strong elastic monopole moments and with elastic torques balanced by optical torques exerted by ambient light. We demonstrate the monopole-to-quadrupole reconfiguration of these colloidal particles by unstructured light, which resembles the driving of atoms between the ground state and various excited states. We show that the sign of the elastic monopoles can be switched, and that like-charged monopoles attract whereas oppositely charged ones repel, unlike in electrostatics14. We also demonstrate the out-of-equilibrium dynamic assembly of these colloidal particles. This diverse and surprising behaviour is explained

关键词： Electrostatics

来源：评论

学校读者我要写书评

暂无评论

Front Cover: Emergence of Non-photoresponsive Catalytic Techniques for Environmental Remediation and Energy Generation (Chem. Asian J. 9/2023)

引用

Chemistry – An Asian Journal 2023年第9期18卷

作者： Manish Kumar Sharma Dr. Imran Khan Kuldeep Kaswan Dr. Snigdha Roy Barman Prof. Dr. Subhajit Saha Wu-Chiao Hsieh Prof. Dr. Yu-Lun Chueh Prof. Dr. Yu-Lin Wang Prof. Dr. Sangmin Lee Prof. Dr. Dukhyun Choi Prof. Dr. Zong-Hong Lin Department of Materials Science and Engineering National Tsing Hua University Hsinchu 30013 Taiwan Institute of NanoEngineering and Microsystems National Tsing Hua University Hsinchu 30013 Taiwan International Intercollegiate PhD Program National Tsing Hua University Hsinchu 30013 Taiwan Department of Renewable Energy Maulana Abul Kalam Azad University of Technology West Bengal 741249 India Department of Obstetrics and Gynecology Chang Gung Memorial Hospital and College of Medicine Chang Gung University Taoyuan 333 Taiwan Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu 30013 Taiwan School of Mechanical Engineering Chung-Ang University Seoul 06974 South Korea Department of Mechanical Engineering Sungkyunkwan University Suwon 16419 South Korea Department of Biomedical Engineering National Taiwan University Taipei 10617 Taiwan

来源：评论

学校读者我要写书评

暂无评论

Three-Dimensional Dynamics of a Magnetic Hopfion Driven by Spin Transfer Torque

引用

Physical Review Letters 2020年第12期124卷 127204-127204页

作者： Yizhou Liu Wentao Hou Xiufeng Han Jiadong Zang Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Department of Physics and Astronomy University of New Hampshire Durham New Hampshire 03824 USA Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China Materials Science Program University of New Hampshire Durham New Hampshire 03824 USA

Magnetic hopfion is a three-dimensional (3D) topological soliton with novel spin structure that would enable exotic dynamics. Here, we study the current-driven 3D dynamics of a magnetic hopfion with a unit Hopf index in a frustrated magnet. Attributed to the spin Berry phase and symmetry of the hopfion, the phase space entangles multiple collective coordinates, thus the hopfion exhibits rich dynamics including longitudinal motion along the current direction, transverse motion perpendicular to the current direction, rotational motion, and dilation. Furthermore, the characteristics of hopfion dynamics is determined by the ratio between the nonadiabatic spin transfer torque parameter and the damping parameter. Such peculiar 3D dynamics of magnetic hopfion could shed light on understanding the universal physics of hopfions in different systems and boost the prosperous development of 3D spintronics.

关键词： Frustrated magnetism Spin texture Spin transfer torque Solitons

来源：评论

学校读者我要写书评

暂无评论

Hypoxia and matrix viscoelasticity sequentially regulate endothelial progenitor cluster-based vasculogenesis 42

Hypoxia and matrix viscoelasticity sequentially regulate end...

引用

42nd Society for Biomaterials Annual Meeting and Exposition 2019: The Pinnacle of Biomaterials Innovation and Excellence

作者： Blatchley, Michael R. Hall, Franklyn Wang, Songnan Pruitt, Hawley C. Gerecht, Sharon Department of Biomedical Engineering BaltimoreMD United States Department of Chemical and Biomolecular Engineering Johns Hopkins Physical Sciences–Oncology Center and Institute for NanoBioTechnology BaltimoreMD United States Department of Materials Science and Engineering Johns Hopkins University and Johns Hopkins School of Medicine BaltimoreMD United States Department of Oncology Johns Hopkins University and Johns Hopkins School of Medicine BaltimoreMD United States

ISBN: (纸本)9781510883901

Statement of Purpose: The mechanisms governing postnatal vasculogenesis have begun to be uncovered in the last several decades. These mechanisms have informed the design of numerous therapeutics, seeking to regenerate or control the formation of new vasculature following loss-of-function diseases, such as peripheral and coronary artery diseases, as well as provide an understanding of tumor angiogenesis. The processes which govern vascular regeneration in such clinical pathologies involve complex spatiotemporal interplay between physical and biochemical cues. The plenary work of several groups has described one mechanism by which blood vessels may form de novo. In this body of work, new blood vessels are formed through intracellular changes in a population wide phenomenon that leads to branching/sprouting through coalescence of single cells to form multicellular, luminal vessels. In addition to these works, a handful of observational reports in hypoxic tissues in vivo have indicated the presence of a secondary mechanism. However, an understanding of the regulatory mechanism governing this process is limited, due to a shortage in model systems that recapitulate the complex pathological microenvironmental cues. © 2019 Omnipress - All rights reserved.

关键词： Blood vessels

来源：评论

学校读者我要写书评

暂无评论

Ionic Liquids: Lubrication Mechanism of Phosphonium Phosphate Ionic Liquid in Nanoscale Single-Asperity Sliding Contacts (Adv. Mater. Interfaces 17/2020)

引用

Advanced materials Interfaces 2020年第17期7卷

作者： Li, Zixuan Dolocan, Andrei Morales-Collazo, Oscar Sadowski, Jerzy T. Celio, Hugo Chrostowski, Robert Brennecke, Joan F. Mangolini, Filippo Texas Materials Institute The University of Texas at Austin AustinTX78712 United States Materials Science and Engineering Program The University of Texas at Austin AustinTX78712 United States McKetta Department of Chemical Engineering The University of Texas at Austin AustinTX78712 United States Center for Functional Nanomaterials Brookhaven National Laboratory UptonNY11973 United States J. Mike Walker Department of Mechanical Engineering The University of Texas at Austin AustinTX78712 United States

来源：评论

学校读者我要写书评

暂无评论

Ultra-Efficient Resistance Switching between Charge Ordered Phases in 1T-TaS2 with a Single Picosecond Electrical Pulse

arXiv

引用

arXiv 2022年

作者： Venturini, Rok Mraz, Anže Vaskivskyi, Igor Vaskivskyi, Yevhenii Svetin, Damjan Mertelj, Tomaž Pavlovič, Leon Cheng, Jing Chen, Genyu Amarasinghe, Priyanthi Qadri, Syed B. Trivedi, Sudhir B. Sobolewski, Roman Mihailovic, Dragan Jožef Stefan Institute Jamova 39 LjubljanaSI-1000 Slovenia Faculty of Mathematics and Physics University of Ljubljana Jadranska 19 LjubljanaSI-1000 Slovenia Faculty for Electrical Engineering University of Ljubljana Tržaška 25 LjubljanaSI-1000 Slovenia CENN Nanocenter Jamova 39 LjubljanaSI-1000 Slovenia ELEP Electronics LjubljanaSI-1000 Slovenia Materials Science Program Laboratory for Laser Energetics University of Rochester New York14627 United States Brimrose Technology Corporation SparksMD21152 United States U.S. Naval Research Laboratory WashingtonDC United States Department of Electrical and Computer Engineering Department of Physics and Astronomy University of Rochester New York14627 United States

Progress in high-performance computing demands significant advances in memory technology. Among novel memory technologies that promise efficient device operation on a sub-ns timescale, resistance switching between charge ordered phases of 1T-TaS2 has shown to be potentially useful for development of high-speed, energy efficient non-volatile memory devices. Measurement of the electrical operation of such devices in the picosecond regime is technically challenging and hitherto still largely unexplored. Here we use an optoelectronic "laboratory-on-a-chip" experiment for measurements of ultrafast memory switching, enabling accurate measurement of electrical switching parameters with 100 fs temporal resolution. Photoexcitation and electro-optic sampling on a (Cd,Mn)Te substrate are used to generate and, subsequently, measure electrical pulse propagation, with intra-band excitation and sub-gap probing, respectively. We demonstrate high contrast non-volatile resistance switching from high to low resistance states of a 1T-TaS2 device using single sub-2ps electrical pulses. Using detailed modeling we find that the switching energy density per unit area is exceptionally small, EA = 9.4 fJ/µm2. The speed and energy efficiency of an electronic "write" process, place the 1T-TaS2 devices into a category of their own among new generation non-volatile memory devices. Copyright © 2022, The Authors. All rights reserved.

关键词： Switching

来源：评论

学校读者我要写书评

暂无评论

THz Emission from Exchange-Coupled Fe/Ru/Ni Spintronic Emitters

THz Emission from Exchange-Coupled Fe/Ru/Ni Spintronic Emitt...

引用

International Conference on Infrared and Millimeter Waves

作者： R. Adam C. Greb D. E. Bürgler D. Cao S. Heidtfeld F. Wang J. Cheng D. Chakraborty I. Komissarov H. Hardtdegen M. Mikulics M. Büscher C. M. Schneider Roman Sobolewski Research Centre Jülich Peter Grünberg Institute (PGI-6) Jülich Germany Institut für Laser- und Plasmaphysik Heinrich Heine Universität Düsseldorf Düsseldorf Germany College of Physics Center for Marine Observation and Communications Qingdao University Qingdao China Materials Science Graduate Program University of Rochester Rochester New York USA Laboratory for Laser Energetics University of Rochester Rochester New York USA Department of Electrical and Computer Engineering University of Rochester Rochester New York USA Research Centre Jülich Ernst Ruska Centre for Microscopy and Spectroscopy with Electrons Jülich Germany Faculty of Physics University Duisburg-Essen Duisburg Germany Department of Physics University of California Davis Davis California USA

We explored THz emission from $\mathrm{Si}^{2} / \mathrm{SiO}_{2} / / \mathrm{Ta} / \mathrm{Fe} / \mathrm{Ru} /$ $\mathrm{Ni} / \mathrm{Al}_{2} \mathrm{O}_{3}$ spintronic emitters. We tuned magnetization alignment of Fe and Ni layers by varying the interlayer exchange coupling (IEC) strength using a range of Ru layer thickness t. Depending on IEC strength, magnetization hysteresis shows either ferromagnetic $(t=1.1 \mathrm{~nm}, 1.5 \mathrm{~nm})$, antiferromagnetic $(t=1.3 \mathrm{~nm})$ or canted $(t=1.7 \mathrm{~nm}, 1.9 \mathrm{~nm})$ relative alignment. Competition between IEC and an external magnetic field results in a dramatic difference in THz emission from the ferromagnetically (FM) and anti-ferromagnetically (AFM) coupled structures. The resulting THz emission from IEC structures is a result of an interference of THz transiens generated by the individual $\mathrm{Fe} / \mathrm{Ru}$ and $\mathrm{Ru} / \mathrm{Ni}$ emitters.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Extended exposure to stiff microenvironments leads to persistent chromatin remodeling in human mesenchymal stem cells 42

Extended exposure to stiff microenvironments leads to persis...

引用

42nd Society for Biomaterials Annual Meeting and Exposition 2019: The Pinnacle of Biomaterials Innovation and Excellence

作者： Killaars, Anouk R. Grim, Joseph C. Walker, Cierra J. Hushka, Ella A. Brown, Tobin E. Anseth, Kristi S. Program of Materials Science and Engineering University of Colorado Boulder BoulderCO80303 United States BioFrontiers Institute University of Colorado Boulder BoulderCO80303 United States Department of Chemical and Biological Engineering University of Colorado Boulder BoulderCO80303 United States

ISBN: (纸本)9781510883901

Statement of purpose: Bone marrow derived human mesenchymal stem cells (hMSCs) are a promising cell source for regenerative therapies;however, ex vivo expansion is often essential to achieve clinically relevant cells numbers. Recent studies reveal that when MSCs are cultured in stiff microenvironments, their regenerative capacity is altered in a manner that is dependent on time (e.g., a mechanical dosing). [1]–[3] We hypothesized that epigenomic modifications were involved in storing these mechanical cues, regulating gene expression, and ultimately inducing a mechanical memory. Using hydrogels containing an allyl sulfide crosslinker and a radical-mediated addition-fragmentation chain transfer process, in situ softened hMSC-laden hydrogels at different time points were achieved and the effects of short-term and long-term mechanical dosing on chromatin remodeling in hMSCs were probed. © 2019 Omnipress - All rights reserved.

关键词： Hydrogels

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：