1
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Cai M, Miao MP, Liang Y, Jiang Z, Liu ZY, Zhang WH, Liao X, Zhu LF, West D, Zhang S, Fu YS. Manipulating single excess electrons in monolayer transition metal dihalide. Nat Commun 2023; 14:3691. [PMID: 37344472 DOI: 10.1038/s41467-023-39360-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Accepted: 06/09/2023] [Indexed: 06/23/2023] Open
Abstract
Polarons are entities of excess electrons dressed with local response of lattices, whose atomic-scale characterization is essential for understanding the many body physics arising from the electron-lattice entanglement, yet difficult to achieve. Here, using scanning tunneling microscopy and spectroscopy (STM/STS), we show the visualization and manipulation of single polarons in monolayer CoCl2, that are grown on HOPG substrate via molecular beam epitaxy. Two types of polarons are identified, both inducing upward local band bending, but exhibiting distinct appearances, lattice occupations and polaronic states. First principles calculations unveil origin of polarons that are stabilized by cooperative electron-electron and electron-phonon interactions. Both types of polarons can be created, moved, erased, and moreover interconverted individually by the STM tip, as driven by tip electric field and inelastic electron tunneling effect. This finding identifies the rich category of polarons in CoCl2 and their feasibility of precise control unprecedently, which can be generalized to other transition metal halides.
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Affiliation(s)
- Min Cai
- School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, 430074, Wuhan, China
| | - Mao-Peng Miao
- School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, 430074, Wuhan, China
| | - Yunfan Liang
- Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
| | - Zeyu Jiang
- Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
| | - Zhen-Yu Liu
- School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, 430074, Wuhan, China
| | - Wen-Hao Zhang
- School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, 430074, Wuhan, China
- Institute for Quantum Science and Engineering, Huazhong University of Science and Technology, 430074, Wuhan, China
| | - Xin Liao
- School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, 430074, Wuhan, China
| | - Lan-Fang Zhu
- School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, 430074, Wuhan, China
| | - Damien West
- Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
| | - Shengbai Zhang
- Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
| | - Ying-Shuang Fu
- School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, 430074, Wuhan, China.
- Institute for Quantum Science and Engineering, Huazhong University of Science and Technology, 430074, Wuhan, China.
- Wuhan Institute of Quantum Technology, 430206, Wuhan, China.
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2
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Hardy M, Roman L, West D, Szydlowski S, Olah M. Social Pathology after Pandemia & Armed Conflicts: Abuse, Depression & other Psychosocial Disorders Importancy of legal Support to continue Vaccination. CSWHI 2022. [DOI: 10.22359/cswhi_13_6_01] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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3
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West D, Krcmery V, Szydlowski S, Ramirez B, Costello M. Preventing the Burnout Syndrome by Creating a Healthy & Healing Environment. CSWHI 2022. [DOI: 10.22359/cswhi_13_6_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Occupational burnout is a significant global problem that has impacted clinical outcomes, patient safety, and patient-centered care across healthcare settings (World Health Organization) [WHO], 2019. The classic definition of burnout, as defined by Dr. Christina Maslach, is “a psychologic syndrome involving emotional exhaustion, depersonalization, and a diminished sense of personal accomplishment (Maslach & Jackson, 1982). Burnout affects cognitive, behavioral and emotional aspects of human behavior. It also interferes with how individuals process and interact with others at an individual and organizational level. Others have noted that burn-out individuals tend to focus on negative things rather than positive emotions (Bianchi & Laurent, 2015). Nurse and physician burnout was recognized before the COVID-19 pandemic as a growing problem. Evidence now suggests that more than 50% of nurses, physician assistants and physicians report syndromes of burnout. The problem has become even more pronounced when the work environment contributes stressors associated with technological advancements, EMRs, increased patient acuity, and financial cost cutting measures. It is now recognized that individuals and organizations burnout. As a public health issue, burnout and well-being are multifactorial and recognize that individuals and organizations contribute significant factors to the burnout syndrome. It appears that burnout rates are rising across specialties and settings resulting in increase of costs to individuals and organizations (National Academy of Medicine [NAM]), 2018. What is needed is a clear map to make decisions on clinical burnout. Healthcare workers (HCW) need confidential access to wellness activities, support systems and mental health consultation. A new model is needed to further refine the work-life balance and create a caring corporate culture. Healthcare leaders need to rethink how to support employees across disciplines when it comes to burnout and well-being.
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4
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Conibear J, Nossiter J, Foster C, West D, Cromwell D, Navani N. The National Lung Cancer Audit: The Impact of COVID-19. Clin Oncol (R Coll Radiol) 2022; 34:701-707. [PMID: 36180356 PMCID: PMC9474418 DOI: 10.1016/j.clon.2022.09.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2022] [Revised: 08/21/2022] [Accepted: 09/02/2022] [Indexed: 01/31/2023]
Abstract
Since 2014, the National Lung Cancer Audit (NLCA) has been evaluating the performance of the UK NHS lung cancer services against established standards of care. Prior to the onset of the COVID-19 pandemic, the NLCA's annual reports revealed a steady stream of improvements in early diagnosis, access to surgery, treatment with anti-cancer therapies, input from specialist nursing and survival for patients with lung cancer in the NHS. In January 2022, the NLCA reported on the negative impact COVID-19 has had on all aspects of the lung cancer diagnosis and treatment pathway within the NHS. This article details the fundamental changes made to the NLCA data collection and analysis process during the COVID-19 pandemic and details the negative impact COVID-19 had on NHS lung cancer patient outcomes during 2020.
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Affiliation(s)
- J Conibear
- Barts Cancer Centre, St. Bartholomew's Hospital, London, UK.
| | - J Nossiter
- Department of Health Services Research and Policy, London School of Hygiene and Tropical Medicine, London, UK; Clinical Effectiveness Unit, Royal College of Surgeons of England, London, UK
| | - C Foster
- Department of Health Services Research and Policy, London School of Hygiene and Tropical Medicine, London, UK; Clinical Effectiveness Unit, Royal College of Surgeons of England, London, UK
| | - D West
- Division of Surgery, University Hospitals Bristol NHS Foundation Trust, Bristol, UK
| | - D Cromwell
- Department of Health Services Research and Policy, London School of Hygiene and Tropical Medicine, London, UK; Clinical Effectiveness Unit, Royal College of Surgeons of England, London, UK
| | - N Navani
- Lungs for Living Research Centre, UCL Respiratory, University College London, London, UK; Department of Thoracic Medicine, University College London Hospital, London, UK
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5
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Muss C, Krcmery V, Gulasova M, Olah M, West D. Collapse of Healthcare Providers-medical and Paramedical-healthcare Staff after last Three Years of Pandemics and War Conflicts. CSWHI 2022. [DOI: 10.22359/cswhi_13_5_02] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This Editorial dispatch focuses on absolute shortage of healthcare workers and their psychical and physical exhaustion with devastation consequences on healthcare providers and management of pandemics and health destruction within ongoing armed conflicts in Europe and Middle East,focusing on non prioritizing HCW versus healthcare infrastructure, vaccines medications, but putting both to the same level of priority.
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6
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Besse R, Wang H, West D, Da Silva JLF, Zhang S. Prediction of Effective Photoelectron and Hole Separation in Type-I MoS 2/PtSe 2 van der Waals Junction. J Phys Chem Lett 2022; 13:6407-6411. [PMID: 35802831 DOI: 10.1021/acs.jpclett.2c01526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Understanding the dynamics of charge transfer at vertical heterostructures of transition metal dichalcogenide monolayers is fundamentally important for future technological applications, given the unique feature of van der Waals interactions at the interface. Here, we employ time-dependent density functional theory formalism combined with molecular dynamics to investigate photoexcited electrons and holes in the type-I MoS2/PtSe2 van der Waals heterobilayer. While type-I junctions have been traditionally viewed as being ineffective in photocarrier separation, we show that here a different mechanism from type-II is at play, which effectively separates photoelectrons from photoholes. The key is the phonon bottleneck, arising from the characteristically different dynamic band alignments in the valence and conduction bands, respectively, which only affects the transfer of holes but not electrons. The disparity between electron and hole transfer rates offers a new direction for effective control of charge separation at interfaces.
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Affiliation(s)
- Rafael Besse
- São Carlos Institute of Physics, University of São Paulo, P.O. Box 369, 13560-970, São Carlos, São Paulo Brazil
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Han Wang
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Damien West
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Juarez L F Da Silva
- São Carlos Institute of Chemistry, University of São Paulo, P.O. Box 780, 13560-970, São Carlos, São Paulo Brazil
| | - Shengbai Zhang
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
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7
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West D, Krcmery W. Devastation Consequences of Pandemia and War Conflicts in Health and Social Security. CSWHI 2022. [DOI: 10.22359/cswhi_13_3_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This current issue of Clinical Social Work and Health Intervention(1) reflects to some extent on two previous issues of this interdisciplinary Journal dealing within the last 2 years with two groups of catastrophic effects on civil society, social security, healthcare and finally to economics worldwide l. Pandemic, declared by WHO and most states authorities worldwide, due to the potentially deadly virus COVID-19, may be followed by another endemic disease e.g. zoonotic influenza, monkey pox and hepatitis X. 2. At least four War conflicts: Azerbaijan versus Armenia; Yemen versus Saudi Forces; Afghanistan versus NATO; and recently the Russian Federation & Belarus versus Ukraine.
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8
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England R, Khodorov G, Anand J, Wangari F, Muruka J, Mollura D, Stewart J, Dixon R, Kesselman A, West D, Anton K. Abstract No. 9 Evaluating global interventional radiology services to improve maternal morbidity and mortality: geographic information system mapping of postpartum hemorrhage and interventional radiology availability in Kenya. J Vasc Interv Radiol 2022. [DOI: 10.1016/j.jvir.2022.03.082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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9
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Al-Kaisey A, Parameswaran R, Anderson R, Chieng D, Hawson J, Voskoboinik A, Sugumar H, Wong G, West D, Azzopardi S, Joseph S, McLellan A, Ling L, Bryant C, Finch S, Sanders P, Lee G, Kistler P, Kalman J. Randomised Evaluation of the Impact of Catheter Ablation on Cognitive Function in Atrial Fibrillation. Heart Lung Circ 2022. [DOI: 10.1016/j.hlc.2022.06.187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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10
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Abstract
Molecular linkers, such as cysteine, are used to stabilize colloidal quantum dots (QDs) and anchor them. Despite the typically large molecular HOMO/LUMO gap of linkers, they can increase the quantum yield and provide an effective charge-transfer channel. Through first-principles calculations, we investigate the ligand binding and the implications for charge transfer using a prototypical CdSe-Cysteine-MoS2 three-way heterostructure. We find that the deprotonated ligand interacts with both sides of the heterostructure, which allows for successful self-passivation of the cysteine ligand molecule and the formation of dative bonds with a greatly reduced molecular gap compared with the gas phase. This leads to the formation of a charge-transfer state that is delocalized across the ligand and can directly assist electron transfer from the conduction band of colloidal CdSe QDs to the underlying MoS2 substrate, which is a mechanism that could extend far beyond 0D-2D hybrid systems.
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Affiliation(s)
- Matthew Ciesler
- Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Damien West
- Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Shengbai Zhang
- Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
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11
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Rozwadowski S, Teh E, West D. 354 Thoracic Complex Case Review Meeting (CCRM): A Multidisciplinary Approach to Improving Patient Care and Service Efficiency. Br J Surg 2021. [DOI: 10.1093/bjs/znab259.237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Abstract
Objectives
The profile of thoracic patients and the indications for surgery are becoming increasingly complex. A multidisciplinary perioperative approach can optimise patients, improve outcomes and prevent high-risk patients being inappropriately declined surgery. We aim to retrospectively review the first 100 patients discussed at the CCRM in 2016-17 with a primary outcome of number of on-the-day cancellations. Secondary outcomes include unplanned critical care (HDU) admissions, 30 and 90-day morbidity and mortality.
Method
Data was collected retrospectively for demographics, co-morbidities, lung-function and dynamic testing, diagnosis and proposed surgical approach. CCRM outcomes included need for HDU, requiring further optimisation, change in surgical strategy or patient deemed too high risk.
Results
Average age was 69 years (IQR 12.5) (65 M: 35 F). American Society of Anaesthesiologists’ classification of 3 with predicted of mortality of 2 % (IQR 0.8). Maximal oxygen uptake (VO2 max) was 18.6ml/kg/min (SD ± 4.2). 24 patients were recommended for optimisation and 34 to proceed with HDU. 14 were deemed too high-risk and 30 had a change in surgical strategy. Only 1 patient was cancelled on-the-day due to a recent deterioration in health. 30 and 90-day mortality rates were 1% and 2% respectively, and 2 patients required unplanned HDU.
Conclusions
CCRM is a simple approach to optimise high-risk patients and minimise unplanned HDU. No patients were cancelled on-the-day due to inadequate optimisation or unexpected need for HDU. Mortality was acceptable and lower than predicted. Our study established CCRM as a safe and effective way of selecting high-risk patients for further optimisation and appropriate perioperative care.
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Affiliation(s)
- S Rozwadowski
- University Hospitals Bristol and Weston NHS Foundation Trust, Bristol, United Kingdom
| | - E Teh
- University Hospitals Bristol and Weston NHS Foundation Trust, Bristol, United Kingdom
| | - D West
- University Hospitals Bristol and Weston NHS Foundation Trust, Bristol, United Kingdom
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12
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Jankechova M, Dubovcova M, Murgova A, Otrubova J, Bednarikova M, Gazova Z, Konosova H, Taziarova M, Kozon V, Olah M, Bundzelova K, Krcmery V, West D. Emerging Wake-up Call before next Pandemics as Apart of Medicine and Technology: We terribly need Social and Healthcare Workers. cswhi 2021. [DOI: 10.22359/cswhi_12_3_14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Thousands of healthcare and social workers (HCSW) died or lost their ability to work in their field after Covid pandemics in all three waves, and thousands left their profession due to burnout syndrome. Despite development of vaccines took 6- 18 months and refreshment of old molecules for treatment weeks, many countries paid a very high price for this pandemics not due to lack of medications or ventilator assistance devices but due to the increasing lack of trained HCSW.
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13
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Han N, Xie W, Zhang J, Liu L, Zhao J, West D, Zhang S. Remote Passivation in Two-Dimensional Materials: The Case of the Monolayer-Bilayer Lateral Junction of MoSe 2. J Phys Chem Lett 2021; 12:8046-8052. [PMID: 34433273 DOI: 10.1021/acs.jpclett.1c02457] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Two-dimensional (2D) monolayer-bilayer (ML-BL) lateral junctions (LJs) have recently attracted attention due to their straightforward synthesis and resulting clean interface. Such systems consist of an extended ML with a secondary layer present only over half of the system, leading to an interface that is associated with the terminating edge of the secondary half layer. Our first-principles calculations reveal that the edges of the half layer completely lack reconstruction in the presence of unintentional dopants, in this case, Re. This observation is in startling contrast to the known physics of three-dimensional (3D) semiconductor surfaces where reconstruction has been widely observed. Herein, the electrostatics of the reduced dimensionality allows for greater separation between compensating defects, enabling dopants to remotely passivate edge states without needing to directly participate in the chemistry.
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Affiliation(s)
- Nannan Han
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, Xi'an 710072, China
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian 116024, China
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy 12180, United States
| | - Weiyu Xie
- China Academy of Engineering Physics Institute of Chemical Materials, Mianyang 621999, China
| | - Junfeng Zhang
- School of Physics and Information Engineering, Shanxi Normal University, Linfen 041004, China
| | - Lizhao Liu
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian 116024, China
| | - Jijun Zhao
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian 116024, China
| | - Damien West
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy 12180, United States
| | - Shengbai Zhang
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy 12180, United States
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14
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Ghoshal D, Shang H, Sun X, Wen X, Chen D, Wang T, Lu Z, Gupta T, Efstathiadis H, West D, Koratkar N, Lu TM, Zhang S, Shi SF. Orientation-Controlled Large-Area Epitaxial PbI 2 Thin Films with Tunable Optical Properties. ACS Appl Mater Interfaces 2021; 13:32450-32460. [PMID: 34196518 DOI: 10.1021/acsami.1c05734] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Lead iodide (PbI2) as a layered material has emerged as an excellent candidate for optoelectronics in the visible and ultraviolet regime. Micrometer-sized flakes synthesized by mechanical exfoliation from bulk crystals or by physical vapor deposition have shown a plethora of applications from low-threshold lasing at room temperature to high-performance photodetectors with large responsivity and faster response. However, large-area centimeter-sized growth of epitaxial thin films of PbI2 with well-controlled orientation has been challenging. Additionally, the nature of grain boundaries in epitaxial thin films of PbI2 remains elusive. Here, we use mica as a model substrate to unravel the growth mechanism of large-area epitaxial PbI2 thin films. The partial growth leading to uncoalesced domains reveals the existence of inversion domain boundaries in epitaxial PbI2 thin films on mica. Combining the experimental results with first-principles calculations, we also develop an understanding of the thermodynamic and kinetic factors that govern the growth mechanism, which paves the way for the synthesis of high-quality large-area PbI2 on other substrates and heterostructures of PbI2 on single-crystalline graphene. The ability to reproducibly synthesize high-quality large-area thin films with precise control over orientation and tunable optical properties could open up unique and hitherto unavailable opportunities for the use of PbI2 and its heterostructures in optoelectronics, twistronics, substrate engineering, and strain engineering.
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Affiliation(s)
- Debjit Ghoshal
- Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Hanzhi Shang
- Department of Physics, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Xin Sun
- Department of Physics, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Xixing Wen
- Department of Physics, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Dongxue Chen
- Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Tianmeng Wang
- Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Zonghuan Lu
- Department of Physics, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Tushar Gupta
- Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Harry Efstathiadis
- Colleges of Nanoscale Science and Engineering, State University of New York Polytechnic Institute, Albany, New York 12203, United States
| | - Damien West
- Department of Physics, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Nikhil Koratkar
- Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
- Department of Material Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Toh-Ming Lu
- Department of Physics, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Shengbai Zhang
- Department of Physics, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Su-Fei Shi
- Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
- Department of Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
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15
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Qin L, Zhang ZH, Jiang Z, Fan K, Zhang WH, Tang QY, Xia HN, Meng F, Zhang Q, Gu L, West D, Zhang S, Fu YS. Realization of AlSb in the Double-Layer Honeycomb Structure: A Robust Class of Two-Dimensional Material. ACS Nano 2021; 15:8184-8191. [PMID: 33723991 DOI: 10.1021/acsnano.1c00470] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Exploring two-dimensional (2D) van der Waals (vdW) systems is at the forefront of materials of physics. Here, through molecular beam epitaxy on graphene-covered SiC(0001), we report successful growth of AlSb in the double-layer honeycomb (DLHC) structure, a 2D vdW material which has no direct analogue to its 3D bulk and is predicted to be kinetically stable when freestanding. The structural morphology and electronic structure of the experimental 2D AlSb are characterized with spectroscopic imaging scanning tunneling microscopy and cross-sectional imaging scanning transmission electron microscopy, which compare well to the proposed DLHC structure. The 2D AlSb exhibits a band gap of 0.93 eV versus the predicted 1.06 eV, which is substantially smaller than the 1.6 eV of bulk. We also attempt the less-stable InSb DLHC structure; however, it grows into bulk islands instead. The successful growth of a DLHC material here demonstrates the feasibility for the realization of a large family of 2D DLHC traditional semiconductors with characteristic excitonic, topological, and electronic properties.
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Affiliation(s)
- Le Qin
- School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Zhi-Hao Zhang
- School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Zeyu Jiang
- Department of Physics, Applied Physics & Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Kai Fan
- School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Wen-Hao Zhang
- School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Qiao-Yin Tang
- School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Hui-Nan Xia
- School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Fanqi Meng
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Qinghua Zhang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Lin Gu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - Damien West
- Department of Physics, Applied Physics & Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Shengbai Zhang
- Department of Physics, Applied Physics & Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Ying-Shuang Fu
- School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China
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16
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Yang G, Wang R, Ge M, Guo M, Wang J, Ma R, Zhang J, West D, Zhang S. Switchable electronic and enhanced magnetic properties of CrI 3 edges. Phys Chem Chem Phys 2021; 23:10518-10523. [PMID: 33899853 DOI: 10.1039/d0cp06155g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Owing to its novel electronic and magnetic properties, two-dimensional CrI3 has great potential in the application of spintronic devices. However, as an inevitable line defect, the properties of the edges of CrI3 remain elusive. Here, via first-principles calculations with spin-orbit coupling, we investigated the thermodynamic stabilities, electronic and magnetic properties of thirteen CrI3 edges with different structures. We showed that zigzag edges are more stable than armchair edges, and a CrI3 nanoribbon can be either metallic or insulating depending on its chemical growth conditions. The edge stability and associated electronic properties can be understood in terms of the octahedron ligand field and electron counting model. In most cases, both the magnetic moment and Curie temperature can be enhanced by edges, which are in startle contrast to the surfaces of three-dimensional ferromagnetic materials, where a magnetic dead layer is often observed.
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Affiliation(s)
- Guohui Yang
- School of Physics and Information Engineering, Shanxi Normal University, Linfen, 041004, China.
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17
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Zhang H, Holbrook M, Cheng F, Nam H, Liu M, Pan CR, West D, Zhang S, Chou MY, Shih CK. Epitaxial Growth of Two-Dimensional Insulator Monolayer Honeycomb BeO. ACS Nano 2021; 15:2497-2505. [PMID: 33481561 DOI: 10.1021/acsnano.0c06596] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The emergence of two-dimensional (2D) materials launched a fascinating frontier of flatland electronics. Most crystalline atomic layer materials are based on layered van der Waals materials with weak interlayer bonding, which naturally leads to thermodynamically stable monolayers. We report the synthesis of a 2D insulator composed of a single atomic sheet of honeycomb structure BeO (h-BeO), although its bulk counterpart has a wurtzite structure. The h-BeO is grown by molecular beam epitaxy (MBE) on Ag(111) thin films that are also epitaxially grown on Si(111) wafers. Using scanning tunneling microscopy and spectroscopy (STM/S), the honeycomb BeO lattice constant is determined to be 2.65 Å with an insulating band gap of 6 eV. Our low-energy electron diffraction measurements indicate that the h-BeO forms a continuous layer with good crystallinity at the millimeter scale. Moiré pattern analysis shows the BeO honeycomb structure maintains long-range phase coherence in atomic registry even across Ag steps. We find that the interaction between the h-BeO layer and the Ag(111) substrate is weak by using STS and complementary density functional theory calculations. We not only demonstrate the feasibility of growing h-BeO monolayers by MBE, but also illustrate that the large-scale growth, weak substrate interactions, and long-range crystallinity make h-BeO an attractive candidate for future technological applications. More significantly, the ability to create a stable single-crystalline atomic sheet without a bulk layered counterpart is an intriguing approach to tailoring 2D electronic materials.
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Affiliation(s)
- Hui Zhang
- Department of Physics, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Madisen Holbrook
- Department of Physics, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Fei Cheng
- Department of Physics, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Hyoungdo Nam
- Department of Physics, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Mengke Liu
- Department of Physics, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Chi-Ruei Pan
- School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Damien West
- Department of Physics, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Shengbai Zhang
- Department of Physics, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Mei-Yin Chou
- School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan
| | - Chih-Kang Shih
- Department of Physics, The University of Texas at Austin, Austin, Texas 78712, United States
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18
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Cheng K, Wang H, Bang J, West D, Zhao J, Zhang S. Carrier Dynamics and Transfer across the CdS/MoS 2 Interface upon Optical Excitation. J Phys Chem Lett 2020; 11:6544-6550. [PMID: 32693591 DOI: 10.1021/acs.jpclett.0c01188] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Carrier dynamics across the interface of heterostructures have important technological, photovoltaic, and catalytic implications. Using first-principles time-dependent density functional theory, we have systematically investigated the charge transfer of excited carriers from CdS to MoS2 and found that two interdependent mechanisms are responsible for the transfer, one slow and one fast. While the slower process may be attributed to typical electron-phonon coupling, the interfacial dipole resulting from this transfer enables a fast secondary process involving a level crossing of the excited carrier state in CdS with receiving states in MoS2. An analysis based on the interfacial binding energy reveals that the Cd-terminated (001) interface is by far the most energetically favorable, which in addition to its calculated fast resonant electron transfer suggests it is a good candidate to explain the experimentally observed charge transfer between CdS and MoS2.
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Affiliation(s)
- Kai Cheng
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, Dalian 116024, China
| | - Han Wang
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Junhyeok Bang
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
- Department of Physics, Chungbuk National University, Chungbuk 28644, Republic of Korea
| | - Damien West
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Jijun Zhao
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, Dalian 116024, China
| | - Shengbai Zhang
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
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19
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West D, Mrazova M, Grey E. Latin American Immigration. Public Health Implications and Challenges. cswhi 2020. [DOI: 10.22359/cswhi_11_2_08] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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20
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West D, Shahum A, Kafkova G, Krcmery V. Health Economics Threats: Lessons from Ebola, Avian Influenza and Coronavirus. cswhi 2020. [DOI: 10.22359/cswhi_11_2_10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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21
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Dietrich A, Foltin V, West D. Hospital Utilization Trends in Selected New EU Member States. cswhi 2020. [DOI: 10.22359/cswhi_11_2_03] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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22
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Ma J, Wang H, Nie S, Yi C, Xu Y, Li H, Jandke J, Wulfhekel W, Huang Y, West D, Richard P, Chikina A, Strocov VN, Mesot J, Weng H, Zhang S, Shi Y, Qian T, Shi M, Ding H. Emergence of Nontrivial Low-Energy Dirac Fermions in Antiferromagnetic EuCd 2 As 2. Adv Mater 2020; 32:e1907565. [PMID: 32091144 DOI: 10.1002/adma.201907565] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 01/20/2020] [Indexed: 06/10/2023]
Abstract
Parity-time symmetry plays an essential role for the formation of Dirac states in Dirac semimetals. So far, all of the experimentally identified topologically nontrivial Dirac semimetals (DSMs) possess both parity and time reversal symmetry. The realization of magnetic topological DSMs remains a major issue in topological material research. Here, combining angle-resolved photoemission spectroscopy with density functional theory calculations, it is ascertained that band inversion induces a topologically nontrivial ground state in EuCd2 As2 . As a result, ideal magnetic Dirac fermions with simplest double cone structure near the Fermi level emerge in the antiferromagnetic (AFM) phase. The magnetic order breaks time reversal symmetry, but preserves inversion symmetry. The double degeneracy of the Dirac bands is protected by a combination of inversion, time-reversal, and an additional translation operation. Moreover, the calculations show that a deviation of the magnetic moments from the c-axis leads to the breaking of C3 rotation symmetry, and thus, a small bandgap opens at the Dirac point in the bulk. In this case, the system hosts a novel state containing three different types of topological insulator: axion insulator, AFM topological crystalline insulator (TCI), and higher order topological insulator. The results provide an enlarged platform for the quest of topological Dirac fermions in a magnetic system.
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Affiliation(s)
- Junzhang Ma
- Paul Scherrer Institute, Swiss Light Source, CH-5232, Villigen, PSI, Switzerland
- Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne, CH-10 15, Lausanne, Switzerland
| | - Han Wang
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
| | - Simin Nie
- Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Changjiang Yi
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - Yuanfeng Xu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - Hang Li
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - Jasmin Jandke
- Paul Scherrer Institute, Swiss Light Source, CH-5232, Villigen, PSI, Switzerland
| | - Wulf Wulfhekel
- Physikalisches Institut, Karlsruhe Institute of Technology, 76131, Karlsruhe, Germany
| | - Yaobo Huang
- Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204, China
| | - Damien West
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
| | - Pierre Richard
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing, 100190, China
- Institut quantique, Université de Sherbrooke, 2500 boulevard de l'Université, Sherbrooke, Québec, J1K 2R1, Canada
| | - Alla Chikina
- Paul Scherrer Institute, Swiss Light Source, CH-5232, Villigen, PSI, Switzerland
| | - Vladimir N Strocov
- Paul Scherrer Institute, Swiss Light Source, CH-5232, Villigen, PSI, Switzerland
| | - Joël Mesot
- Paul Scherrer Institute, Swiss Light Source, CH-5232, Villigen, PSI, Switzerland
- Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne, CH-10 15, Lausanne, Switzerland
| | - Hongming Weng
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- Songshan Lake Materials Laboratory Dongguan, Guangdong, 523808, China
| | - Shengbai Zhang
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
| | - Youguo Shi
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- Songshan Lake Materials Laboratory Dongguan, Guangdong, 523808, China
| | - Tian Qian
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- Songshan Lake Materials Laboratory Dongguan, Guangdong, 523808, China
| | - Ming Shi
- Paul Scherrer Institute, Swiss Light Source, CH-5232, Villigen, PSI, Switzerland
| | - Hong Ding
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physics, University of Chinese Academy of Sciences, Beijing, 100190, China
- Songshan Lake Materials Laboratory Dongguan, Guangdong, 523808, China
- CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing, 100190, China
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23
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Laperle AH, Sances S, Yucer N, Dardov VJ, Garcia VJ, Ho R, Fulton AN, Jones MR, Roxas KM, Avalos P, West D, Banuelos MG, Shu Z, Murali R, Maidment NT, Van Eyk JE, Tagliati M, Svendsen CN. iPSC modeling of young-onset Parkinson's disease reveals a molecular signature of disease and novel therapeutic candidates. Nat Med 2020; 26:289-299. [PMID: 31988461 DOI: 10.1038/s41591-019-0739-1] [Citation(s) in RCA: 80] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Accepted: 12/16/2019] [Indexed: 12/21/2022]
Abstract
Young-onset Parkinson's disease (YOPD), defined by onset at <50 years, accounts for approximately 10% of all Parkinson's disease cases and, while some cases are associated with known genetic mutations, most are not. Here induced pluripotent stem cells were generated from control individuals and from patients with YOPD with no known mutations. Following differentiation into cultures containing dopamine neurons, induced pluripotent stem cells from patients with YOPD showed increased accumulation of soluble α-synuclein protein and phosphorylated protein kinase Cα, as well as reduced abundance of lysosomal membrane proteins such as LAMP1. Testing activators of lysosomal function showed that specific phorbol esters, such as PEP005, reduced α-synuclein and phosphorylated protein kinase Cα levels while increasing LAMP1 abundance. Interestingly, the reduction in α-synuclein occurred through proteasomal degradation. PEP005 delivery to mouse striatum also decreased α-synuclein production in vivo. Induced pluripotent stem cell-derived dopaminergic cultures reveal a signature in patients with YOPD who have no known Parkinson's disease-related mutations, suggesting that there might be other genetic contributions to this disorder. This signature was normalized by specific phorbol esters, making them promising therapeutic candidates.
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Affiliation(s)
- A H Laperle
- Cedars-Sinai Board of Governors Regenerative Medicine Institute, Los Angeles, CA, USA
| | - S Sances
- Cedars-Sinai Board of Governors Regenerative Medicine Institute, Los Angeles, CA, USA
| | - N Yucer
- Cedars-Sinai Board of Governors Regenerative Medicine Institute, Los Angeles, CA, USA
| | - V J Dardov
- Cedars-Sinai Board of Governors Regenerative Medicine Institute, Los Angeles, CA, USA
| | - V J Garcia
- Cedars-Sinai Board of Governors Regenerative Medicine Institute, Los Angeles, CA, USA
| | - R Ho
- Cedars-Sinai Board of Governors Regenerative Medicine Institute, Los Angeles, CA, USA
| | - A N Fulton
- Cedars-Sinai Board of Governors Regenerative Medicine Institute, Los Angeles, CA, USA
| | - M R Jones
- Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, USA
- Center for Bioinformatics and Functional Genomics, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - K M Roxas
- Cedars-Sinai Board of Governors Regenerative Medicine Institute, Los Angeles, CA, USA
| | - P Avalos
- Cedars-Sinai Board of Governors Regenerative Medicine Institute, Los Angeles, CA, USA
| | - D West
- Cedars-Sinai Board of Governors Regenerative Medicine Institute, Los Angeles, CA, USA
| | - M G Banuelos
- Cedars-Sinai Board of Governors Regenerative Medicine Institute, Los Angeles, CA, USA
| | - Z Shu
- Department of Psychiatry and Biobehavioral Sciences, Semel Institute for Neuroscience and Human Behavior, University of California, Los Angeles, CA, USA
| | - R Murali
- Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, USA
- Samuel Oschin Comprehensive Cancer Institute, Los Angeles, CA, USA
- Research Division of Immunology, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - N T Maidment
- Department of Psychiatry and Biobehavioral Sciences, Semel Institute for Neuroscience and Human Behavior, University of California, Los Angeles, CA, USA
| | - J E Van Eyk
- Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, USA
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, CA, USA
- Smidt Heart Institute, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - M Tagliati
- Department of Neurology, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - C N Svendsen
- Cedars-Sinai Board of Governors Regenerative Medicine Institute, Los Angeles, CA, USA.
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24
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Feldsine PT, Lienau AH, Forgey RL, Calhoon RD, Al-Hasani S, Arling V, Bandiera T, Barnes M, Beatty S, Beaudoin A, Beyer D, Bryant J, Burzynski M, Carey B, Copeland F, Culver D, Danisavich T, Destro C, Diaz B, Fitzgerald S, Gallagher D, Franke W, Freshly J, Gary J, Harper M, Hermann C, Isakson T, Jenkins P, Johnson S, Ke J, Krause C, Lange K, Maki G, McDonagh S, McKee B, McLenaghan J, Miller L, Phebus R, Raghubeer E, Redding R, Retzlaff D, Richter D, Ritger C, Robinson J, Saunders L, Schwants D, Trottier Y, Tuncan E, Vanderbilt K, Ward D, West D, Woo L, Zebchek A. Visual Immunoprecipitate Assay (VIP) for Listeria monocytogenes and Related Listeria Species Detection in Selected Foods: Collaborative Study. J AOAC Int 2020. [DOI: 10.1093/jaoac/80.4.791] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
Six foods representing a variety of food products were analyzed by the Assurance Listeria polyclonal enzyme immunoassay (EIA) and by either the Bacteriological Analytical Manual or the U.S. Department of Agriculture culture method for detecting Listeria monocytogenes and related Listeria species. Samples of each food type, at each inoculation level, were analyzed simultaneously by both methods. A total of 19 laboratories representing federal government agencies and private industry in the United States and Canada participated. Food types were inoculated with Listeria species including L. monocytogenes, with the exception of 3 lots of green beans, which were naturally contaminated. During this study, 1764 samples and controls were analyzed and confirmed, of which 492 were positive and 947 were negative by both methods. There were 159 samples that were positive by culture method but negative by the EIA and 188 that were negative by culture method but positive by EIA. Twenty-two samples were negative by EIA and by culture method but confirmed positive when Assurance selective enrichment broths were subcultured to selective agar. The Assurance polyclonal EIA for detecting L. monocytogenes and related Listeria species in foods has been adopted first action by AOAC INTERNATIONAL.
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Affiliation(s)
| | - Andrew H Lienau
- BioControl Systems, Inc., 19805 N. Creek Parkway, Bothell, WA 98011
| | - Robin L Forgey
- BioControl Systems, Inc., 19805 N. Creek Parkway, Bothell, WA 98011
| | - Roger D Calhoon
- BioControl Systems, Inc., 19805 N. Creek Parkway, Bothell, WA 98011
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25
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Feldsine PT, Falbo-Nelson MT, Brunelle SL, Forgey RL, Al-Hasani S, Ball C, Beatty S, Blanchfield B, Bowen B, Bremer N, Brookman D, Brookman S, Brushaber M, Bryant J, Bryant D, Bryant R, Chlebowski ET, Copeland F, Culak DA, Dalley E, Destro C, Finkenbiner D, Frissora R, Fung DYC, Garcia GR, Gray MR, Hagen CJ, Harshavardhan T, Hart-Thakur R, Inami G, Johnson S, Kandakai LV, Lessard D, Lin S, Liu V, Matiuck S, McAteer L, Miller L, Moon B, Nasri H, Pack L, Pilot K, Price C, Pruett P, Ramirez C, Richter D, Schmieg JA, Schultz G, Sloan EM, Sprague DM, Tebay D, Tomer J, Tuncan E, Warburton D, Watson M, West D. Assurance Enzyme Immunoassay for Detection of Enterohemorrhagic Escherichia coli 0157:H7 in Selected Foods: Collaborative Study. J AOAC Int 2020. [DOI: 10.1093/jaoac/80.3.530] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
Five foods types were analyzed by the Assurance EHEC (Escherichia coli 0157:H7) enzyme immunoassay (EIA) and by the Bacteriological Analytical Manual (BAM) culture method. Each sample of each food type at each inoculation level was simultaneously analyzed by both methods. A total of 21 laboratories representing state and federal government agencies and private industry in the United States and Canada participated. Samples were inoculated with E. coli 0157:H7, except for one lot of poultry that was naturally contaminated. A total of 1304 samples and controls were analyzed and confirmed, of which 473 were positive and 818 were negative by both methods. Thirteen samples were positive by BAM but negative by EIA. Because of the study design, it was not possible for the BAM method to produce false-negative or falsepositive results. The Assurance method for detection of E. coli OI57:H7 in selected foods has been adopted first action by AOAC INTERNATIONAL.
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Affiliation(s)
| | | | | | - Robin L Forgey
- BioControl Systems, Inc., 19805 N. Creek Parkway, Bothell, WA 98011
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26
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Warburton DW, Feldsine PT, Falbo-Nelson MT, Ackerl J, Adamik D, Aldenrath S, Allain P, Arling V, Beaton L, Bowen B, Brocklehurst F, Catherwood K, Cavadini J, Coignaud C, Cooper A, Coulter R, Davis T, Douey D, Downey W, Drummond J, Durzi S, Dzogan S, Foster R, Fox C, Gibson E, Gour L, Gover G, Gray M, Heidebrecht P, Kerwood J, Krohn G, Kupskay B, LaFreniere D, Massicotte R, McDonagh S, Molleken B, Oggle J, Perlette M, Pugh P, Purvis U, Saint W, Trottier Y, Vinet J, West D, Wheeler B, Zebchuk A. Modified Immunodiffusion Method for Detection of Salmonella in Raw Flesh and Highly Contaminated Foods: Collaborative Study. J AOAC Int 2020. [DOI: 10.1093/jaoac/78.1.59] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Abstract
A total of 19 government and private industry laboratories in Canada and the United States participated in the collaborative study. Naturally contaminated ground poultry and animal meals, as well as inoculated raw shrimp, were examined for presence of Salmonella by both the modified immunodiffusion method and the Bacteriological Analytical Manual culture method, resulting in an agreement rate of 93.1%. The 2 methods are statistically equivalent for all food types at each inoculation level and for all lots of naturally contaminated foods evaluated in this study. The modification of the AOAC Official Method 989.13, immunodiffusion (1–2 TEST) method for detection of motile Salmonella in all foods, has been adopted revised first action by AOAC INTERNATIONAL.
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Affiliation(s)
- Donald W Warburton
- Health Canada, Health Protection Branch, Food Directorate, Bureau of Microbial Hazards, Evaluation Division, Sir Frederick G. Banting Research Center, Ottawa, ON, K1A OL2, Canada
| | - Philip T Feldsine
- BioControl Systems, Inc., 19805 North Creek Parkway, Bothell, WA 98011
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27
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Feldsine PT, Albo-Nelson MT, Brunelle SL, Forgey RL, Al-Hasani S, Ball C, Beatty S, Blanchfield B, Bowen B, Bremer N, Brookman D, Brookman S, Brushaber M, Bryant J, Bryant D, Bryant R, Chlebowski ET, Copeland F, Culak DA, Dalley E, Destro C, Finkenbiner D, Frissora R, Fung DYC, Garcia GR, Gray MR, Hagen CJ, Harshavardhan T, Hart-Thakur R, Inami G, Johnson S, Kandakai LV, Lessard D, Lin S, Liu V, Matiuck S, McAteer L, Miller L, Moon B, Nasri H, Pack L, Pilot K, Price C, Pruett P, Ramirez C, Richter D, Schmieg JA, Schultz G, Sloan EM, Sprague DM, Tebay D, Tomer J, Tuncan E, Warburton D, Watson M, West D. Visual Immunoprecipitate Assay (VIP) for Detection of Enterohemorrhagic Escherichia coli (EHEC) 0157:H7 in Selected Foods: Collaborative Study. J AOAC Int 2020. [DOI: 10.1093/jaoac/80.3.517] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
Five foods representative of a variety of food products were analyzed by the Visual Immunoprecipitate Assay (VIP) and the Bacteriological Analytical Manual (BAM) culture method for the presence of Escherichia coli 0157: H7. A total of 21 laboratories representing state and federal government agencies, as well as private industry, in the United States and Canada participated. Food types were inoculated with strains of E. coli 0157:H7, with the exception of one lot of poultry, which was naturally contaminated. During this study, a total of 1377 samples and controls were analyzed and confirmed, of which 508 were positive and 867 were negative by both methods. Two samples were positive by BAM and negative by VIP. Because of the study design, it was not possible for the BAM method to produce false-negative or false-positive results. The VIP assay for detection of EHEC in selected foods has been adopted first action by AOAC INTERNATIONAL.
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Affiliation(s)
| | | | | | - Robin L Forgey
- BioControl Systems, Inc., 19805 N. Creek Parkway, Bothell, WA 98011
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Feldsine PT, Lienau AH, Forgey RL, Calhoon RD, Al-Hasani S, Arling V, Bandiera T, Barnes M, Beatty S, Beaudoin A, Beyer D, Bryant J, Burzynski M, Carey B, Copeland F, Culver D, Destro C, Diaz B, Franke W, Gallagher D, Gary J, Harper M, Hermann C, Isakson T, Jenkins P, Johnson S, Ke J, Krause C, Lange K, Trottier YL, Maki G, McDonagh S, McLenaghan J, Miller L, Phebus R, Raghubeer E, Redding R, Retzlaff D, Richter D, Ritger C, Robinson J, Saunders L, Schwants D, Tuncan E, Vanderbilt K, Ward D, West D, Woo L, Zebchek A. Assurance Polyclonal Enzyme Immunoassay for Detection of Listeria monocytogenes and Related Listeria Species in Selected Foods: Collaborative Study. J AOAC Int 2020. [DOI: 10.1093/jaoac/80.4.775] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Abstract
Six foods representing a variety of food products were analyzed by the Assurance Listeria polyclonal enzyme immunoassay (EIA) and by either the Bacteriological Analytical Manual or the U.S. Department of Agriculture culture method for detecting Listeria monocytogenes and related Listeria species. Samples of each food type, at each inoculation level, were analyzed simultaneously by both methods. A total of 19 laboratories representing federal government agencies and private industry in the United States and Canada participated. Food types were inoculated with Listeria species including L. monocytogenes, with the exception of 3 lots of green beans, which were naturally contaminated. During this study, 1764 samples and controls were analyzed and confirmed, of which 492 were positive and 947 were negative by both methods. There were 159 samples that were positive by culture method but negative by the EIA and 188 that were negative by culture method but positive by EIA. Twenty-two samples were negative by EIA and by culture method but confirmed positive when Assurance selective enrichment broths were subcultured to selective agar. The Assurance polyclonal EIA for detecting L. monocytogenes and related Listeria species in foods has been adopted first action by AOAC INTERNATIONAL.
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Affiliation(s)
| | - Andrew H Lienau
- BioControl Systems, Inc., 19805 N. Creek Parkway, Bothell, WA 98011
| | - Robin L Forgey
- BioControl Systems, Inc., 19805 N. Creek Parkway, Bothell, WA 98011
| | - Roger D Calhoon
- BioControl Systems, Inc., 19805 N. Creek Parkway, Bothell, WA 98011
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Agiorgousis ML, Sun* Y, Choe D, West D, Zhang* S. Machine Learning Augmented Discovery of Chalcogenide Double Perovskites for Photovoltaics. Adv Theory Simul 2020. [DOI: 10.1002/adts.201900200] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Feldsine PT, Mui LA, Forgey RL, Kerr DE, Al-Hasani S, Arling V, Beatty S, Bohannon J, Brannan J, Brown N, Bryant J, Burford M, Chavez C, Chinault K, Cooan N, Copeland F, Dixon L, Fitzgerald S, Franke W, Frissora R, Gailbreath K, Godon S, Good M, Ha T, Hagen H, Hanson S, Johnson K, Koch S, Leung S, Lienau A, Lin J, Lin S, Marolla B, Maycock L, McDonagh S, Miller L, Otten N, Post R, Resutek J, Rice B, Richter D, Ritger C, Schwantes D, Simon J, Smith J, Smith S, Stokes R, Thibideau J, Tuncan E, Uber D, Van Landingham V, Vrana D, West D. Equivalence of Assurance® Gold Enzyme Immunoassay for Visual or Instrumental Detection of Motile and Nonmotile Salmonella in All Foods to AOAC Culture Method: Collaborative Study. J AOAC Int 2019. [DOI: 10.1093/jaoac/83.4.871] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Abstract
Six foods representative of a wide variety of processed, dried powder processed, and raw food types were analyzed by the Assurance® Gold Salmonella Enzyme Immunoassay (EIA) and AOAC INTERNATIONAL culture method. Paired samples of each food type were simultaneously analyzed; one sample by the Assurance method and one by the AOAC culture method. The results for Assurance method were read visually and instrumentally with a microplate reader. A total of 24 laboratories representing federal government agencies and private industry, in the United States and Canada, participated in this collaborative study. Food types were inoculated with species of Salmonella with the exception of raw ground chicken, which was naturally contaminated. No statistical differences (p < 0.05) were observed between Assurance Gold Salmonella EIA with either visual or instrumental interpretation and the AOAC culture method for any inoculation level of any food type or naturally contaminated food. The Assurance visual and instrumental options of reading sample reactions produced the same results for 1277 of the 1296 sample and controls analyzed.
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Affiliation(s)
| | - Linda A Mui
- BioControl Systems, Inc., 12822 SE 32nd St, Bellevue, WA 98005
| | - Robin L Forgey
- BioControl Systems, Inc., 12822 SE 32nd St, Bellevue, WA 98005
| | - David E Kerr
- BioControl Systems, Inc., 12822 SE 32nd St, Bellevue, WA 98005
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Kalatova D, Luliak M, West D, Krcmery V, Jalili N, Olah M, Matulnikova L, Palun M. Do Midwifes Represent Risk of “Stealing” Patients from OBG Physicians? Not in Low and Middle-income System. cswhi 2019. [DOI: 10.22359/cswhi_10_3_07] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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32
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Bartkovjak M, Olah M, Krcmery V, Nemcokova A, West D, Zavis M. Growing Population of Elderly in Europe – A Wake Up Call for Social Services Expansion. cswhi 2019. [DOI: 10.22359/cswhi_10_2_03] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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L. Agiorgousis M, Sun Y, Choe D, West D, Zhang S. Machine Learning Augmented Discovery of Chalcogenide Double Perovskites for Photovoltaics. Adv Theory Simul 2019. [DOI: 10.1002/adts.201800173] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Michael L. Agiorgousis
- Department of Physics, Applied Physics, and Astronomy Rensselaer Polytechnic Institute Troy NY 12180 USA
| | - Yi‐Yang Sun
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 201899 China
| | - Duk‐Hyun Choe
- Department of Physics, Applied Physics, and Astronomy Rensselaer Polytechnic Institute Troy NY 12180 USA
| | - Damien West
- Department of Physics, Applied Physics, and Astronomy Rensselaer Polytechnic Institute Troy NY 12180 USA
| | - Shengbai Zhang
- Department of Physics, Applied Physics, and Astronomy Rensselaer Polytechnic Institute Troy NY 12180 USA
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Wang N, West D, Duan W, Zhang SB. Effective chemical potential for non-equilibrium systems and its application to molecular beam epitaxy of Bi 2Se 3. Nanoscale Adv 2019; 1:470-475. [PMID: 36132266 PMCID: PMC9473254 DOI: 10.1039/c8na00136g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Accepted: 09/29/2018] [Indexed: 05/31/2023]
Abstract
First-principles studies often rely on the assumption of equilibrium, which can be a poor approximation, e.g., for growth. Here, an effective chemical potential ([italic small mu, Greek, macron]) method for non-equilibrium systems is developed. A salient feature of the theory is that it maintains the equilibrium limits as the correct limit. In application to molecular beam epitaxy, rate equations are solved for the concentrations of small clusters, which serve as feedstock for growth. We find that [italic small mu, Greek, macron] is determined by the most probable, rather than by the lowest-energy, cluster. In the case of Bi2Se3, [italic small mu, Greek, macron] is found to be highly supersaturated, leading to a high nucleus concentration in agreement with experiment.
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Affiliation(s)
- Na Wang
- Department of Physics, Tsinghua University Beijing 100084 China
- Department of Physical Chemistry, University of Science and Technology Beijing Beijing 100083 China
- Department of Physics, Applied Physics & Astronomy, Rensselaer Polytechnic Institute Troy NY 12180 USA
| | - Damien West
- Department of Physics, Applied Physics & Astronomy, Rensselaer Polytechnic Institute Troy NY 12180 USA
| | - Wenhui Duan
- Department of Physics, Tsinghua University Beijing 100084 China
| | - S B Zhang
- Department of Physics, Applied Physics & Astronomy, Rensselaer Polytechnic Institute Troy NY 12180 USA
- Beijing Computational Science Research Center Beijing 100193 China
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Teh E, Low A, Casali G, West D. Engaging with the National Optimal Lung Cancer Curative Intent Management Pathway: the Bristol experience. Lung Cancer 2019. [DOI: 10.1016/s0169-5002(19)30059-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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36
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Boger L, Fowler B, West D, Patel T. An unexpected cause of bilateral periorbital oedema. Clin Exp Dermatol 2018; 44:781-783. [PMID: 30484885 DOI: 10.1111/ced.13829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/13/2018] [Indexed: 11/29/2022]
Affiliation(s)
- L Boger
- Department of Dermatology, University of Tennessee Health Science Center, Memphis, TN, USA
| | - B Fowler
- Department of Ophthalmology, University of Tennessee Health Science Center, Memphis, TN, USA
| | - D West
- Department of Ophthalmology, University of Tennessee Health Science Center, Memphis, TN, USA
| | - T Patel
- Department of Dermatology, University of Tennessee Health Science Center, Memphis, TN, USA
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Abstract
The built-in potential is of central importance to the understanding of many interfacial phenomena because it determines the band alignment at the interface. Despite its importance, its exact sign and magnitude have generally been recognized as ill-defined quantities for more than half a century. Here, we provide a common energy reference of bulk matter which leads to an unambiguous definition of the built-in potential and innate (i.e., bulk) band alignment. Further, we find that the built-in potential is explicitly determined by the bulk properties of the constituent materials when the system is in electronic equilibrium, while the interface plays a role only in the absence of equilibrium. Our quantitative theory enables a unified description of a variety of important properties of interfaces, ranging from work functions to Schottky barriers in electronic devices.
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Affiliation(s)
- Duk-Hyun Choe
- Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
| | - Damien West
- Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
| | - Shengbai Zhang
- Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
- Beijing Computational Science Research Center, 10 East Xibeiwang Road, Beijing 100193, China
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Larsen C, Richard C, West D. DO DEMENTIA CAREGIVERS HAVE WORSE HEALTH OUTCOMES AS COMPARED TO NON-CAREGIVERS IN A NATIONAL SAMPLE? Innov Aging 2018. [DOI: 10.1093/geroni/igy031.3443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
| | | | - D West
- University of South Carolina
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39
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Hardy M, Vansac P, Benca J, Palun M, Gallova A, Susta M, Otrubova J, Jankechova M, Matulnikova L, Subramanian S, Sramkova M, Cmorej P, West D, Kimuli D. Demand on Non-Medical Health Professions Training: Adaptation to New Challenges of the Aging Populations (letter). cswhi 2018. [DOI: 10.22359/cswhi_9_3_11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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40
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Li Y, Wang T, Wang H, Li Z, Chen Y, West D, Sankar R, Ulaganathan RK, Chou F, Wetzel C, Xu CY, Zhang S, Shi SF. Enhanced Light Emission from the Ridge of Two-Dimensional InSe Flakes. Nano Lett 2018; 18:5078-5084. [PMID: 30021441 DOI: 10.1021/acs.nanolett.8b01940] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
InSe, a newly rediscovered two-dimensional (2D) semiconductor, possesses superior electrical and optical properties as a direct-band-gap semiconductor with high mobility from bulk to atomically thin layers and is drastically different from transition-metal dichalcogenides, in which the direct band gap only exists at the single-layer limit. However, absorption in InSe is mostly dominated by an out-of-plane dipole contribution, which results in the limited absorption of normally incident light that can only excite the in-plane dipole at resonance. To address this challenge, we have explored a unique geometric ridge state of the 2D flake without compromising the sample quality. We observed the enhanced absorption at the ridge over a broad range of excitation frequencies from photocurrent and photoluminescence (PL) measurements. In addition, we have discovered new PL peaks at low temperatures due to defect states on the ridge, which can be as much as ∼60 times stronger than the intrinsic PL peak of InSe. Interestingly, the PL of the defects is highly tunable through an external electrical field, which can be attributed to the Stark effect of the localized defects. InSe ridges thus provide new avenues for manipulating light-matter interactions and defect engineering that are vitally crucial for novel optoelectronic devices based on 2D semiconductors.
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Affiliation(s)
- Yang Li
- School of Materials Science and Engineering , Harbin Institute of Technology , Harbin 150001 , China
| | | | | | - Zhipeng Li
- School of Chemistry and Chemical Engineering , Shanghai Jiao Tong University , Shanghai 200240 , China
| | | | | | - Raman Sankar
- Institute of Physics , Academia Sinica , Nangang, Taipei , Taiwan 11529 , Taiwan
- Center for Condensed Matter Science , National Taiwan University , Taipei , Taiwan 10617 , Taiwan
| | - Rajesh K Ulaganathan
- Institute of Physics , Academia Sinica , Nangang, Taipei , Taiwan 11529 , Taiwan
- Center for Condensed Matter Science , National Taiwan University , Taipei , Taiwan 10617 , Taiwan
| | - Fangcheng Chou
- Institute of Physics , Academia Sinica , Nangang, Taipei , Taiwan 11529 , Taiwan
- Center for Condensed Matter Science , National Taiwan University , Taipei , Taiwan 10617 , Taiwan
| | | | - Cheng-Yan Xu
- School of Materials Science and Engineering , Harbin Institute of Technology , Harbin 150001 , China
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41
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West L, Tran A, Tucker K, Staley A, West D, Gehrig P. Obesity is associated with chemotherapy delay in ovarian cancer patients. Gynecol Oncol 2018. [DOI: 10.1016/j.ygyno.2018.04.323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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42
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Chen NK, Li XB, Bang J, Wang XP, Han D, West D, Zhang S, Sun HB. Directional Forces by Momentumless Excitation and Order-to-Order Transition in Peierls-Distorted Solids: The Case of GeTe. Phys Rev Lett 2018; 120:185701. [PMID: 29775378 DOI: 10.1103/physrevlett.120.185701] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 09/11/2017] [Indexed: 05/11/2023]
Abstract
Time-dependent density-functional theory molecular dynamics reveals an unexpected effect of optical excitation in the experimentally observed rhombohedral-to-cubic transition of GeTe. The excitation induces coherent forces along [001], which may be attributed to the unique energy landscape of Peierls-distorted solids. The forces drive the A_{1g} optical phonon mode in which Ge and Te move out of phase. Upon damping of the A_{1g} mode, phase transition takes place, which involves no atomic diffusion, defect formation, or the nucleation and growth of the cubic phase.
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Affiliation(s)
- Nian-Ke Chen
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
| | - Xian-Bin Li
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
| | - Junhyeok Bang
- Spin Engineering Physics Team, Korea Basic Science Institute (KBSI), Daejeon 305-806, Republic of Korea
| | - Xue-Peng Wang
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
| | - Dong Han
- State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
| | - Damien West
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
| | - Shengbai Zhang
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
| | - Hong-Bo Sun
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
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Matz M, Coleman MP, Sant M, Chirlaque MD, Visser O, Gore M, Allemani C, Bouzbid S, Hamdi-Chérif M, Zaidi Z, Bah E, Swaminathan R, Nortje S, El Mistiri M, Bayo S, Malle B, Manraj S, Sewpaul-Sungkur R, Fabowale A, Ogunbiyi O, Bradshaw D, Somdyala N, Stefan D, Abdel-Rahman M, Jaidane L, Mokni M, Kumcher I, Moreno F, González M, Laura E, Espinola S, Calabrano G, Carballo Quintero B, Fita R, Garcilazo D, Giacciani P, Diumenjo M, Laspada W, Green M, Lanza M, Ibañez S, Lima C, Lobo de Oliveira E, Daniel C, Scandiuzzi C, De Souza P, Melo C, Del Pino K, Laporte C, Curado M, de Oliveira J, Veneziano C, Veneziano D, Latorre M, Tanaka L, Azevedo e Silva G, Galaz J, Moya J, Herrmann D, Vargas S, Herrera V, Uribe C, Bravo L, Arias-Ortiz N, Jurado D, Yépez M, Galán Y, Torres P, Martínez-Reyes F, Pérez-Meza M, Jaramillo L, Quinto R, Cueva P, Yépez J, Torres-Cintrón C, Tortolero-Luna G, Alonso R, Barrios E, Nikiforuk C, Shack L, Coldman A, Woods R, Noonan G, Turner D, Kumar E, Zhang B, McCrate F, Ryan S, Hannah H, Dewar R, MacIntyre M, Lalany A, Ruta M, Marrett L, Nishri D, McClure C, Vriends K, Bertrand C, Louchini R, Robb K, Stuart-Panko H, Demers S, Wright S, George J, Shen X, Brockhouse J, O'Brien D, Ward K, Almon L, Bates J, Rycroft R, Mueller L, Phillips C, Brown H, Cromartie B, Schwartz A, Vigneau F, MacKinnon J, Wohler B, Bayakly A, Clarke C, Glaser S, West D, Green M, Hernandez B, Johnson C, Jozwik D, Charlton M, Lynch C, Huang B, Tucker T, Deapen D, Liu L, Hsieh M, Wu X, Stern K, Gershman S, Knowlton R, Alverson J, Copeland G, Rogers D, Lemons D, Williamson L, Hood M, Hosain G, Rees J, Pawlish K, Stroup A, Key C, Wiggins C, Kahn A, Schymura M, Leung G, Rao C, Giljahn L, Warther B, Pate A, Patil M, Schubert S, Rubertone J, Slack S, Fulton J, Rousseau D, Janes T, Schwartz S, Bolick S, Hurley D, Richards J, Whiteside M, Nogueira L, Herget K, Sweeney C, Martin J, Wang S, Harrelson D, Keitheri Cheteri M, Farley S, Hudson A, Borchers R, Stephenson L, Espinoza J, Weir H, Edwards B, Wang N, Yang L, Chen J, Song G, Gu X, Zhang P, Ge H, Zhao D, Zhang J, Zhu F, Tang J, Shen Y, Wang J, Li Q, Yang X, Dong J, Li W, Cheng L, Chen J, Huang Q, Huang S, Guo G, Wei K, Chen W, Zeng H, Demetriou A, Pavlou P, Mang W, Ngan K, Swaminathan R, Kataki A, Krishnatreya M, Jayalekshmi P, Sebastian P, Sapkota S, Verma Y, Nandakumar A, Suzanna E, Keinan-Boker L, Silverman B, Ito H, Nakagawa H, Hattori M, Kaizaki Y, Sugiyama H, Utada M, Katayama K, Narimatsu H, Kanemura S, Koike T, Miyashiro I, Yoshii M, Oki I, Shibata A, Matsuda T, Nimri O, Ab Manan A, Bhoo-Pathy N, Tuvshingerel S, Chimedsuren O, Al Khater A, El Mistiri M, Al-Eid H, Jung K, Won Y, Chiang C, Lai M, Suwanrungruang K, Wiangnon S, Daoprasert K, Pongnikorn D, Geater S, Sriplung H, Eser S, Yakut C, Hackl M, Mühlböck H, Oberaigner W, Zborovskaya A, Aleinikova O, Henau K, Van Eycken L, Dimitrova N, Valerianova Z, Šekerija M, Zvolský M, Engholm G, Storm H, Innos K, Mägi M, Malila N, Seppä K, Jégu J, Velten M, Cornet E, Troussard X, Bouvier A, Faivre J, Guizard A, Bouvier V, Launoy G, Arveux P, Maynadié M, Mounier M, Fournier E, Woronoff A, Daoulas M, Clavel J, Le Guyader-Peyrou S, Monnereau A, Trétarre B, Colonna M, Cowppli-Bony A, Molinié F, Bara S, Degré D, Ganry O, Lapôtre-Ledoux B, Grosclaude P, Estève J, Bray F, Piñeros M, Sassi F, Stabenow R, Eberle A, Erb C, Nennecke A, Kieschke J, Sirri E, Kajueter H, Emrich K, Zeissig S, Holleczek B, Eisemann N, Katalinic A, Brenner H, Asquez R, Kumar V, Ólafsdóttir E, Tryggvadóttir L, Comber H, Walsh P, Sundseth H, Devigili E, Mazzoleni G, Giacomin A, Bella F, Castaing M, Sutera A, Gola G, Ferretti S, Serraino D, Zucchetto A, Lillini R, Vercelli M, Busco S, Pannozzo F, Vitarelli S, Ricci P, Pascucci C, Autelitano M, Cirilli C, Federico M, Fusco M, Vitale M, Usala M, Cusimano R, Mazzucco W, Michiara M, Sgargi P, Maule M, Sacerdote C, Tumino R, Di Felice E, Vicentini M, Falcini F, Cremone L, Budroni M, Cesaraccio R, Contrino M, Tisano F, Fanetti A, Maspero S, Candela G, Scuderi T, Gentilini M, Piffer S, Rosso S, Sacchetto L, Caldarella A, La Rosa F, Stracci F, Contiero P, Tagliabue G, Dei Tos A, Zorzi M, Zanetti R, Baili P, Berrino F, Gatta G, Sant M, Capocaccia R, De Angelis R, Liepina E, Maurina A, Smailyte G, Agius D, Calleja N, Siesling S, Visser O, Larønningen S, Møller B, Dyzmann-Sroka A, Trojanowski M, Góźdż S, Mężyk R, Grądalska-Lampart M, Radziszewska A, Didkowska J, Wojciechowska U, Błaszczyk J, Kępska K, Bielska-Lasota M, Kwiatkowska K, Forjaz G, Rego R, Bastos J, Silva M, Antunes L, Bento M, Mayer-da-Silva A, Miranda A, Coza D, Todescu A, Valkov M, Adamcik J, Safaei Diba C, Primic-Žakelj M, Žagar T, Stare J, Almar E, Mateos A, Quirós J, Bidaurrazaga J, Larrañaga N, Díaz García J, Marcos A, Marcos-Gragera R, Vilardell Gil M, Molina E, Sánchez M, Franch Sureda P, Ramos Montserrat M, Chirlaque M, Navarro C, Ardanaz E, Moreno-Iribas C, Fernández-Delgado R, Peris-Bonet R, Galceran J, Khan S, Lambe M, Camey B, Bouchardy C, Usel M, Ess S, Herrmann C, Bulliard J, Maspoli-Conconi M, Frick H, Kuehni C, Schindler M, Bordoni A, Spitale A, Chiolero A, Konzelmann I, Dehler S, Matthes K, Rashbass J, Stiller C, Fitzpatrick D, Gavin A, Bannon F, Black R, Brewster D, Huws D, White C, Finan P, Allemani C, Bonaventure A, Carreira H, Coleman M, Di Carlo V, Harewood R, Liu K, Matz M, Montel L, Nikšić M, Rachet B, Sanz N, Spika D, Stephens R, Peake M, Chalker E, Newman L, Baker D, Soeberg M, Aitken J, Scott C, Stokes B, Venn A, Farrugia H, Giles G, Threlfall T, Currow D, You H, Hendrix J, Lewis C. Erratum to “The histology of ovarian cancer: Worldwide distribution and implications for international survival comparisons (CONCORD-2)” [Gynecol. Oncol. 144 (2017) 405–413]. Gynecol Oncol 2017; 147:726. [DOI: 10.1016/j.ygyno.2017.06.032] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Khakwani A, Harden S, Baldwin D, Foweraker K, Navani N, Dickinson R, West D, Beckett P, Hubbard R. P1.05-010 Curative Treatment Rates for Patients Diagnosed with Early Stage Non-Small Cell Lung Cancer (NSCLC) in England. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Golish J, Sleeper G, Bastani B, Rashidi M, West D. 0574 SLEEP-REPOSITIONING IS A REQUIRED COMPONENT IN MAKING NASAL EPAP EFFECTIVE IN CONTROLLING OSA. Sleep 2017. [DOI: 10.1093/sleepj/zsx050.573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Gao N, Yang L, Gao F, Kurtz RJ, West D, Zhang S. Long-time atomistic dynamics through a new self-adaptive accelerated molecular dynamics method. J Phys Condens Matter 2017; 29:145201. [PMID: 28059774 DOI: 10.1088/1361-648x/aa574b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A self-adaptive accelerated molecular dynamics method is developed to model infrequent atomic-scale events, especially those events that occur on a rugged free-energy surface. Key in the new development is the use of the total displacement of the system at a given temperature to construct a boost-potential, which is slowly increased to accelerate the dynamics. The temperature is slowly increased to accelerate the dynamics. By allowing the system to evolve from one steady-state configuration to another by overcoming the transition state, this self-evolving approach makes it possible to explore the coupled motion of species that migrate on vastly different time scales. The migrations of single vacancy (V) and small He-V clusters, and the growth of nano-sized He-V clusters in Fe for times in the order of seconds are studied by this new method. An interstitial-assisted mechanism is first explored for the migration of a helium-rich He-V cluster, while a new two-component Ostwald ripening mechanism is suggested for He-V cluster growth.
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Affiliation(s)
- N Gao
- Institute of Modern Physics, Chinese Academy of Sciences, 73000 LanZhou, People's Republic of China. Pacific Northwest National Laboratory, P O Box 999, Richland, WA 99352, United States of America
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Niekamp A, Colen R, Mazal N, Cardenas N, Goldberg J, West D. Radiomic texture analysis on CT images predicts key genomic information in hepatocellular carcinoma. J Vasc Interv Radiol 2017. [DOI: 10.1016/j.jvir.2016.12.611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Xu B, Lefringhouse J, Liu Z, West D, Baldwin LA, Ou C, Chen L, Napier D, Chaiswing L, Brewer LD, St Clair D, Thibault O, van Nagell JR, Zhou BP, Drapkin R, Huang JA, Lu ML, Ueland FR, Yang XH. Inhibition of the integrin/FAK signaling axis and c-Myc synergistically disrupts ovarian cancer malignancy. Oncogenesis 2017; 6:e295. [PMID: 28134933 PMCID: PMC5294249 DOI: 10.1038/oncsis.2016.86] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Revised: 10/23/2016] [Accepted: 11/16/2016] [Indexed: 02/06/2023] Open
Abstract
Integrins, a family of heterodimeric receptors for extracellular matrix, are promising therapeutic targets for ovarian cancer, particularly high-grade serous-type (HGSOC), as they drive tumor cell attachment, migration, proliferation and survival by activating focal adhesion kinase (FAK)-dependent signaling. Owing to the potential off-target effects of FAK inhibitors, disruption of the integrin signaling axis remains to be a challenge. Here, we tackled this barrier by screening for inhibitors being functionally cooperative with small-molecule VS-6063, a phase II FAK inhibitor. From this screening, JQ1, a potent inhibitor of Myc oncogenic network, emerged as the most robust collaborator. Treatment with a combination of VS-6063 and JQ1 synergistically caused an arrest of tumor cells at the G2/M phase and a decrease in the XIAP-linked cell survival. Our subsequent mechanistic analyses indicate that this functional cooperation was strongly associated with the concomitant disruption of activation or expression of FAK and c-Myc as well as their downstream signaling through the PI3K/Akt pathway. In line with these observations, we detected a strong co-amplification or upregulation at genomic or protein level for FAK and c-Myc in a large portion of primary tumors in the TCGA or a local HGSOC patient cohort. Taken together, our results suggest that the integrin–FAK signaling axis and c-Myc synergistically drive cell proliferation, survival and oncogenic potential in HGSOC. As such, our study provides key genetic, functional and signaling bases for the small-molecule-based co-targeting of these two distinct oncogenic drivers as a new line of targeted therapy against human ovarian cancer.
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Affiliation(s)
- B Xu
- Department of Pharmacology and Nutritional Science, University of Kentucky, Lexington, KY, USA.,Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY, USA.,Markey Cancer Center, University of Kentucky, Lexington, KY, USA
| | - J Lefringhouse
- Department of Pharmacology and Nutritional Science, University of Kentucky, Lexington, KY, USA.,Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY, USA.,Markey Cancer Center, University of Kentucky, Lexington, KY, USA.,Department of Obstetrics and Gynecology, University of Kentucky, Lexington, KY, USA.,Department of Pathology, University of Kentucky, Lexington, KY, USA
| | - Z Liu
- Department of Pharmacology and Nutritional Science, University of Kentucky, Lexington, KY, USA.,Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY, USA.,Markey Cancer Center, University of Kentucky, Lexington, KY, USA.,Department of Respiratory Medicine, First Affiliated Hospital of Soochow University, Jiangsu Province, PR China
| | - D West
- Department of Obstetrics and Gynecology, University of Kentucky, Lexington, KY, USA.,Department of Pathology, University of Kentucky, Lexington, KY, USA
| | - L A Baldwin
- Department of Pharmacology and Nutritional Science, University of Kentucky, Lexington, KY, USA.,Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY, USA.,Markey Cancer Center, University of Kentucky, Lexington, KY, USA.,Department of Obstetrics and Gynecology, University of Kentucky, Lexington, KY, USA.,Department of Pathology, University of Kentucky, Lexington, KY, USA
| | - C Ou
- Department of Pharmacology and Nutritional Science, University of Kentucky, Lexington, KY, USA.,Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY, USA.,Markey Cancer Center, University of Kentucky, Lexington, KY, USA
| | - L Chen
- Department of Pharmacology and Nutritional Science, University of Kentucky, Lexington, KY, USA.,Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY, USA.,Markey Cancer Center, University of Kentucky, Lexington, KY, USA
| | - D Napier
- Department of Obstetrics and Gynecology, University of Kentucky, Lexington, KY, USA.,Department of Pathology, University of Kentucky, Lexington, KY, USA
| | - L Chaiswing
- Department of Toxicology and Cancer Biology, University of Kentucky, Lexington, KY, USA
| | - L D Brewer
- Department of Pharmacology and Nutritional Science, University of Kentucky, Lexington, KY, USA.,Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY, USA.,Markey Cancer Center, University of Kentucky, Lexington, KY, USA
| | - D St Clair
- Department of Toxicology and Cancer Biology, University of Kentucky, Lexington, KY, USA
| | - O Thibault
- Department of Pharmacology and Nutritional Science, University of Kentucky, Lexington, KY, USA.,Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY, USA.,Markey Cancer Center, University of Kentucky, Lexington, KY, USA
| | - J R van Nagell
- Department of Obstetrics and Gynecology, University of Kentucky, Lexington, KY, USA.,Department of Pathology, University of Kentucky, Lexington, KY, USA
| | - B P Zhou
- Department of Pharmacology and Nutritional Science, University of Kentucky, Lexington, KY, USA.,Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY, USA.,Markey Cancer Center, University of Kentucky, Lexington, KY, USA
| | - R Drapkin
- Department of Gynecologic Cancer Research, Basser Center for BRCA, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA, USA
| | - J-A Huang
- Department of Respiratory Medicine, First Affiliated Hospital of Soochow University, Jiangsu Province, PR China
| | - M L Lu
- Department of Biomedical Science, Florida Atlantic University, Boca Raton, FL, USA
| | - F R Ueland
- Department of Obstetrics and Gynecology, University of Kentucky, Lexington, KY, USA.,Department of Pathology, University of Kentucky, Lexington, KY, USA
| | - X H Yang
- Department of Pharmacology and Nutritional Science, University of Kentucky, Lexington, KY, USA.,Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY, USA.,Markey Cancer Center, University of Kentucky, Lexington, KY, USA.,Department of Respiratory Medicine, First Affiliated Hospital of Soochow University, Jiangsu Province, PR China
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West D, Beckett P, Khakwani A, Hubbard R, Dickinson R, Woolhouse I. S60 Lung cancer surgical survival and volume in england. Thorax 2016. [DOI: 10.1136/thoraxjnl-2016-209333.66] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Bookman K, West D, McIntyre R, Steinbruner D, Solley M, Carlson N, Hammes A, Ginde A, Zane R. 10 Embedded Clinical Decision Support in an Electronic Health Record Decreases Use of High Cost Imaging in the Emergency Department: The EmbED study. Ann Emerg Med 2016. [DOI: 10.1016/j.annemergmed.2016.08.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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