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Chiu PWY, Ng SC, Inoue H, Reddy DN, Ling Hu E, Cho JY, Ho LK, Hewett DG, Chiu HM, Rerknimitr R, Wang HP, Ho SH, Seo DW, Goh KL, Tajiri H, Kitano S, Chan FKL. Practice of endoscopy during COVID-19 pandemic: position statements of the Asian Pacific Society for Digestive Endoscopy (APSDE-COVID statements). Gut 2020; 69:991-996. [PMID: 32241897 PMCID: PMC7211066 DOI: 10.1136/gutjnl-2020-321185] [Citation(s) in RCA: 241] [Impact Index Per Article: 60.3] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2020] [Revised: 03/25/2020] [Accepted: 03/25/2020] [Indexed: 12/15/2022]
Abstract
Coronavirus-19 (COVID-19) caused by SARS-CoV-2 has become a global pandemic. Risk of transmission may occur during endoscopy and the goal is to prevent infection among healthcare professionals while providing essential services to patients. Asia was the first continent to have a COVID-19 outbreak, and this position statement of the Asian Pacific Society for Digestive Endoscopy shares our successful experience in maintaining safe and high-quality endoscopy practice at a time when resources are limited. Sixteen experts from key societies of digestive endoscopy in Asia were invited to develop position statements, including patient triage and risk assessment before endoscopy, resource prioritisation and allocation, regular monitoring of personal protective equipment, infection control measures, protective device training and implementation of a strategy for stepwise resumption of endoscopy services after control of the COVID-19 outbreak.
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Affiliation(s)
- Philip Wai Yan Chiu
- Department of Surgery, The Chinese University of Hong Kong, Hong Kong, Hong Kong
| | - Siew C Ng
- Department of Medicine and Therapeutics, Institute of Digestive Disease, State Key Laboratory of Digestive Disease, LKS Institute of Health Sciences, The Chinese University of Hong Kong, Hong Kong, Hong Kong
| | - Haruhiro Inoue
- Digestive Disease Center, Showa University, Northern Yokohama Hospital, Yokohama, Japan
| | - D Nageshwar Reddy
- Asian Healthcare Foundation, Asian Institute of Gastroenterology, Hyderabad, Andhra Pradesh, India
| | - Enqiang Ling Hu
- Department of Gastroenterology and Hepatology, General Hospital of Chinese PLA, Beijing, China
| | - Joo Young Cho
- Digestive Endoscopy Center, CHA Bundang Medical Center, CHA University, Seoul, Republic of Korea
| | - Lawrence Ky Ho
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - David G Hewett
- School of Medicine, The University of Queensland, Brisbane, Queensland, Australia
- Division of Gastroenterology, Queen Elizabeth II Jubilee Hospital, Brisbane, Queensland, Australia
| | - Han-Mo Chiu
- Department of Internal Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
| | | | - Hsiu-Po Wang
- Department of Internal Medicine, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan
| | - Shiaw Hooi Ho
- Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
| | - Dong Wan Seo
- Asan Medical Center, Songpa-gu, Seoul, Republic of Korea
| | - Khean-Lee Goh
- Department of Gastroenterology and Hepatology, University of Malaya, Kuala Lumpur, Malaysia
| | - Hisao Tajiri
- Division of Gastroenterology and Hepatology, The Jikei University School of Medicine, Tokyo, Japan
- Department of Endoscopy, The Jikei University School of Medicine, Tokyo, Japan
| | | | - Francis K L Chan
- Department of Medicine and Therapeutics, Institute of Digestive Disease, State Key Laboratory of Digestive Disease, LKS Institute of Health Sciences, The Chinese University of Hong Kong, Hong Kong, Hong Kong
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Hennessy K, Badolato A, Winger M, Gerace D, Atatüre M, Gulde S, Fält S, Hu EL, Imamoğlu A. Quantum nature of a strongly coupled single quantum dot–cavity system. Nature 2007; 445:896-9. [PMID: 17259971 DOI: 10.1038/nature05586] [Citation(s) in RCA: 425] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2006] [Accepted: 01/08/2007] [Indexed: 11/09/2022]
Abstract
Cavity quantum electrodynamics (QED) studies the interaction between a quantum emitter and a single radiation-field mode. When an atom is strongly coupled to a cavity mode, it is possible to realize important quantum information processing tasks, such as controlled coherent coupling and entanglement of distinguishable quantum systems. Realizing these tasks in the solid state is clearly desirable, and coupling semiconductor self-assembled quantum dots to monolithic optical cavities is a promising route to this end. However, validating the efficacy of quantum dots in quantum information applications requires confirmation of the quantum nature of the quantum-dot-cavity system in the strong-coupling regime. Here we find such confirmation by observing quantum correlations in photoluminescence from a photonic crystal nanocavity interacting with one, and only one, quantum dot located precisely at the cavity electric field maximum. When off-resonance, photon emission from the cavity mode and quantum-dot excitons is anticorrelated at the level of single quanta, proving that the mode is driven solely by the quantum dot despite an energy mismatch between cavity and excitons. When tuned to resonance, the exciton and cavity enter the strong-coupling regime of cavity QED and the quantum-dot exciton lifetime reduces by a factor of 145. The generated photon stream becomes antibunched, proving that the strongly coupled exciton/photon system is in the quantum regime. Our observations unequivocally show that quantum information tasks are achievable in solid-state cavity QED.
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Affiliation(s)
- K Hennessy
- Institute of Quantum Electronics, ETH Zürich, HPT G10, 8093 Zurich, Switzerland
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Strauf S, Hennessy K, Rakher MT, Choi YS, Badolato A, Andreani LC, Hu EL, Petroff PM, Bouwmeester D. Self-tuned quantum dot gain in photonic crystal lasers. Phys Rev Lett 2006; 96:127404. [PMID: 16605958 DOI: 10.1103/physrevlett.96.127404] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2005] [Indexed: 05/08/2023]
Abstract
We demonstrate that very few (2-4) quantum dots as a gain medium are sufficient to realize a photonic-crystal laser based on a high-quality nanocavity. Photon correlation measurements show a transition from a thermal to a coherent light state proving that lasing action occurs at ultralow thresholds. Observation of lasing is unexpected since the cavity mode is in general not resonant with the discrete quantum dot states and emission at those frequencies is suppressed. In this situation, the quasicontinuous quantum dot states become crucial since they provide an energy-transfer channel into the lasing mode, effectively leading to a self-tuned resonance for the gain medium.
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Affiliation(s)
- S Strauf
- Materials Department, University of California Santa Barbara, Santa Barbara, California 93106, USA.
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Kiraz A, Reese C, Gayral B, Zhang L, Schoenfeld WV, Gerardot BD, Petroff PM, Hu EL, Imamoglu A. Cavity-quantum electrodynamics with quantum dots. ACTA ACUST UNITED AC 2003. [DOI: 10.1088/1464-4266/5/2/303] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Whaley SR, English DS, Hu EL, Barbara PF, Belcher AM. Selection of peptides with semiconductor binding specificity for directed nanocrystal assembly. Nature 2000; 405:665-8. [PMID: 10864319 DOI: 10.1038/35015043] [Citation(s) in RCA: 1091] [Impact Index Per Article: 45.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
In biological systems, organic molecules exert a remarkable level of control over the nucleation and mineral phase of inorganic materials such as calcium carbonate and silica, and over the assembly of crystallites and other nanoscale building blocks into complex structures required for biological function. This ability to direct the assembly of nanoscale components into controlled and sophisticated structures has motivated intense efforts to develop assembly methods that mimic or exploit the recognition capabilities and interactions found in biological systems. Of particular value would be methods that could be applied to materials with interesting electronic or optical properties, but natural evolution has not selected for interactions between biomolecules and such materials. However, peptides with limited selectivity for binding to metal surfaces and metal oxide surfaces have been successfully selected. Here we extend this approach and show that combinatorial phage-display libraries can be used to evolve peptides that bind to a range of semiconductor surfaces with high specificity, depending on the crystallographic orientation and composition of the structurally similar materials we have used. As electronic devices contain structurally related materials in close proximity, such peptides may find use for the controlled placement and assembly of a variety of practically important materials, thus broadening the scope for 'bottom-up' fabrication approaches.
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Affiliation(s)
- S R Whaley
- Department of Chemistry and Biochemistry, The University of Texas at Austin, 78712, USA
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Thomas M, Blank HR, Wong KC, Nguyen C, Kroemer H, Hu EL. Flux-periodic resistance oscillations in arrays of superconducting weak links based on InAs-AlSb quantum wells with Nb electrodes. Phys Rev B Condens Matter 1996; 54:R2311-R2314. [PMID: 9986165 DOI: 10.1103/physrevb.54.r2311] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Koester SJ, Brar B, Bolognesi CR, Caine EJ, Patlach A, Hu EL, Kroemer H, Rooks MJ. Length dependence of quantized conductance in ballistic constrictions fabricated on InAs/AlSb quantum wells. Phys Rev B Condens Matter 1996; 53:13063-13073. [PMID: 9982985 DOI: 10.1103/physrevb.53.13063] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Koester SJ, Bolognesi CR, Thomas M, Hu EL, Kroemer H, Rooks MJ. Determination of one-dimensional subband spacings in InAs/AlSb ballistic constrictions using magnetic-field measurements. Phys Rev B Condens Matter 1994; 50:5710-5712. [PMID: 9976920 DOI: 10.1103/physrevb.50.5710] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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