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Modelling charge transport and electro-optical characteristics of quantum dot light-emitting diodes

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npj Computational Materials 2021年第1期7卷 1116-1126页

作者： Sung-Min Jung Tae Hoon Lee Sang Yun bang Soo Deok Han Dong-wook Shin Sanghyo Lee Hyung woo Choi Yo-Han Suh Xiang-Bing Fan Jeong-Wan Jo Shijie Zhan Jiajie Yang Chatura Samarakoon Yoonwoo Kim Luigi GOcchipinti Gehan Amaratunga Jong Min Kim Electrical Engineering Division Department of EngineeringUniversity of CambridgeCambridgeUnited Kingdom

Quantum dot light-emitting diodes(QD-LEDs)are considered as competitive candidate for next-generation displays or *** advances in the synthesis of core/shell quantum dots(QDs)and tailoring procedures for achieving their high quantum yield have facilitated the emergence of high-performance ***,the charge-carrier dynamics in QD-LED devices,which constitutes the remaining core research area for further improvement of QD-LEDs,is,however,poorly understood ***,we propose a charge transport model in which the charge-carrier dynamics in QD-LEDs are comprehensively described by computer *** charge-carrier injection is modelled by the carrier-capturing process,while the effect of electric fields at their interfaces is *** simulated electro-optical characteristics of QD-LEDs,such as the luminance,current density and external quantum efficiency(EQE)curves with varying voltages,show excellent agreement with ***,our computational method proposed here provides a useful means for designing and optimising high-performance QD-LED devices.

关键词： quantum charge competitive

Gastric cancer patients at high-risk of having synchronous cancer

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World Journal of Gastroenterology 2006年第16期12卷 2588-2592页

作者： Jun Ho Lee Ja Seong Bae Keun Won Ryu Jong Seok Lee Sook Ryun Park chan Gyoo Kim Myoung Cheorl Kook Il Ju Choi Young woo Kim Jae-Gahb Park Jae-Moon Bae Research Institute & Hospital National Cancer Center809 Madul-dongIlsandong-guGoyang-siGyeonggi-do411-769Korea

AIM： To identify patients with a high-risk of having a synchronous cancer among gastric cancer patients. METHODS： We retrospectively analyzed the prospective gastric cancer database at the National Cancer Center, Korea from December 2000 to December 2004. The clinicopathological characteristics of patients with synchronous cancers and those of patients without synchronous cancers were compared. Multivariate analysis was performed to identify the risk factors for the presence of a synchronous cancer in gastric cancer patients. RESULTS： 111 of 3291 gastric cancer patients （3.4%） registered in the database had a synchronous cancer. Among these 111 patients, 109 had a single synchronous cancer and 2 patients had two synchronous cancers. The most common form of synchronous cancer was colorectal cancer （42 patients, 37.2%） followed by lung cancer （21 patients, 18.6%）. Multivariate analyses revealed that elderly patients with differentiated early gastric cancer have a higher probability of a synchronous cancer. CONCLUSION： Synchronous cancers in gastric cancer patients are not infrequent. The physicians should try to find synchronous cancers in gastric cancer patients, especially in the elderly with a differentiated early gastric

关键词： Synchronous cancer Gastric cancer Colorectal cancer

Oligomerization between BSU1 Family Members Potentiates Brassinosteroid Signaling in Arabidopsis

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Molecular Plant 2016年第1期9卷 178-181页

作者： Eun-Ji Kim Ji-Hyun Youn chan-Ho Park Tae-woo Kim Shenheng Guan Shouling Xu AlmaL. Burlingame Young-Pil Kim Seong-Ki Kim Zhi-Yong Wang Tae-Wuk Kim Research Institute for Natural Sciences Hanyang University Seoul 133-791 Korea

Brassinosteroid （BR） regulates diverse physiological and devel- opmental processes in plants （Choudhary et al., 2012）. BR binds to the receptor kinase BRI1 to trigger a phosphorylation/ dephosphorylation cascade, which includes phosphorylation of Brassinosteroid Signaling Kinase 1 （BSK1） and Constitutive Differential Growth 1 （CDG1） by BRI1, phosphorylation of BSU1 by CDG1, and dephosphorylation of BIN2 （a GSK3-1ike kinase） by BSU1 （Kim et al., 2009, 2011; Wang et al., 2014）. Almost all the downstream components of BR signaling are encoded by multiple genes of a family.

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Saeng-Kankunbi-Tang(生肝健脾汤) Protects Liver against Oxidative Damage through Activation of ERK/Nrf2 Pathway

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Chinese Journal of Integrative Medicine 2016年第8期22卷 619-628页

作者： In woo Lee Hee Yoon Choi Ju-Hee Lee Sun-Dong Park Seung Mo Kim Sae Kwang Ku 赵容杰 Sang chan Kim Young woo Kim Hong Sik Choi Department of Internal Oriental Medicine of Hepatology College of Oriental Medicine Daegu Haany University Daegu 38610 Korea Medical Research Center for Globalization of Herbal Formulation College of Oriental Medicine Daegu Haany University Daegu 38610 Korea College of Oriental Medicine Dongguk University Gyeongju 38066 Korea School of Mental Health Jining Medical University JiningShandong Province 272067 China

Objective： To investigate the cytoprotective effects of Saeng-kankunbi-tang（生肝健脾汤, SKT）, a herbal prescription consisting of Artemisia capillaris and Alisma canaliculatum, and its underlying mechanism involved. Methods： In mice, blood biochemistry and histopathology were assessed in carbon tetrachloride（CCl4）-induced oxidative hepatic injury in vivo. The animal groups included vehicle-treated control, CCl4, SKT 500 mg/（kg·day） CCl4＋SKT 200 or 500 mg/（kg·day）. In Hep G2 cell, tert-butyl hydroperoxide（t BHP） induced severe oxidative stress and mitochondrial dysfunction in vitro. The cyto-protective effects of SKT were determined by 3-（4,5-dimethylthiazol）-2,5-diphenyltetrazolium bromide（MTT） assay, fluorescence activated cell sorting analysis and western blotting. Results： The administration of SKT prevented liver damage induced by CCl4 in mice, by inhibition of hepatocyte degeneration and inflammatory cell infiltration as well as plasma parameters such as alanine aminotransferase（P〈0.01）. Moreover, treatment with t BHP induced hepatocyte death and cellular reactive oxygen species production in hepatocyte cell line. However, SKT pretreatment（30–300 μg/m L） reduced this cell death and oxidative stress（P〈0.01）. More importantly, SKT inhibited the ability of t BHP to induce changes in mitochondrial membrane transition in cell stained with rhodamine 123（P〈0.01）. Furthermore, treatment with SKT induced extracellular signal-regulated kinases-mediated nuclear factor erythroid-2-related factor 2（Nrf2） activation as well as the expressions of heme oxygenase 1 and glutamate-cystein ligase catalytic, Nrf2 target genes. Conclusion： SKT has the ability to protect hepatocyte against oxidative stress and mitochondrial damage mediated by Nrf2 activation.

关键词： Saeng-kankunbi-tang mitochondria nuclear factor erythroid-2-related factor 2 oxidative stress liver mouse

Hypertensive-Nimodipine Therapy for Middle Cerebral Artery Vasospasm after Resection of Glioblastoma Multiforme: A Case Report and Literature Review

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Open Journal of Modern Neurosurgery 2015年第3期5卷 76-83页

作者： Peter Yat Ming woo Ka Wing Michael See Jason Kwan Ho Chow Yung chan Hoi Tung Wong Kwong Yau chan Department of Neurosurgery Kwong Wah Hospital Hong Kong China

Delayed cerebral ischemia (DCI) due to post-brain tumor resection vasospasm is an often unrecognized yet debilitating complication. We present a patient with DCI after the resection of glioblastoma multiforme (GBM). To our knowledge, this is the first report on DCI after GBM resection. A 52-year-old female patient with headache for one month underwent subtotal resection of a left temporal GBM encasing the proximal middle cerebral artery (MCA). She was well during the immediate postoperative period but developed right upper limb dense monoparesis on postoperative day four with computed tomographic angiography confirming left MCA vasospasm. Symptoms were significantly alleviated with weeklong hypertensive therapy and nimodipine administration;however they recurred soon after cessation of treatment. A high index of clinical suspicion is needed for the diagnosis of post-tumor resection DCI. Any new postoperative neurological deficit that cannot be explained by hemorrhage, seizures or infection should be expeditiously investigated by angiography or transcranial Doppler sonography. Prompt initiation of hypertensive and nimodipine therapy can possibly reverse neurological deficit. Treatment should be guided by Doppler, angiographic or perfusion imaging studies and not by clinical improvement alone.

关键词： Cerebral Vasospasm Delayed Cerebral Ischemia Glioblastoma Multiforme Hypertensive Therapy Nimodipine

Targeting papain-like protease for broad-spectrum coronavirus inhibition

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Protein & Cell 2022年第12期13卷 940-953页

作者： Shuofeng Yuan Xiaopan Gao Kaiming Tang Jian-Piao Cai Menglong Hu Peng Luo Lei Wen Zi-Wei Ye Cuiting Luo Jessica Oi-Ling Tsang Chris Chun-Yiu chan Yaoqiang Huang Jianli Cao Ronghui Liang Zhenzhi Qin Bo Qin Feifei Yin Hin Chu Dong-Yan Jin Ren Sun Jasper Fuk-woo chan Sheng Cui Kwok-Yung Yuen State Key Laboratory of Emerging Infectious Diseases Li Ka Shing Faculty of MedicineThe University of Hong KongPokfulamHong Kong SARChina Department of Microbiology Li Ka ShingFaculty of MedicineThe University of Hong KongPokfulamHong Kong SARChina NHC Key Laboratory of Systems Biology of Pathogens Institute of Pathogen BiologyChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100730China School of Biomedical Sciences Li Ka Shing Faculty of MedicineThe University of Hong KongPokfulamHong Kong SARChina Department of Molecular and Medical Pharmacology David Geffen School of MedicineUniversity of California Los AngelesLos AngelesCAUSA Key Laboratory of Tropical Translational Medicine of Ministry of Education Hainan Medical UniversityHaikou 571199China Academician Workstation of Hainan Province Hainan Medical UniversityHaikou 571199China Hainan Medical University-The University of Hong Kong Joint Laboratory of Tropical Infectious Diseases The University of Hong KongPokfulamHong Kong Special Administrative RegionChina Guangzhou Laboratory Guangzhou 510320China Department of Clinical Microbiology and Infection Control The University of Hong Kong-Shenzhen HospitalShenzhen 518053China

The emergence of SARS-CoV-2 variants of concern and repeated outbreaks of coronavirus epidemics in the past two decades emphasize the need for next-generation pan-coronaviral *** the multi-functional papain-like protease(PLpro)domain of the viral nsp3 holds ***,none of the known coronavirus PLpro inhibitors has been shown to be in vivo ***,we screened a structurally diverse library of 50,080 compounds for potential coronavirus PLpro inhibitors and identified a noncovalent lead inhibitor F0213 that has broad-spectrum anti-coronaviral activity,including against the Sarbecoviruses(SARSCoV-1 and SARS-CoV-2),Merbecovirus(MERS-CoV),as well as the Alphacoronavirus(hCoV-229E and hCoVOC43).Importantly,F0213 confers protection in both SARS-CoV-2-infected hamsters and MERS-CoV-infected human DPP4-knockin mice.F0213 possesses a dual therapeutic functionality that suppresses coronavirus replication via blocking viral polyprotein cleavage,as well as promoting antiviral immunity by antagonizing the PLpro deubiquitinase *** the significant difference of substrate recognition,mode of inhibition studies suggest that F0213 is a competitive inhibitor against SARS2-PLpro via binding with the 157K amino acid residue,whereas an allosteric inhibitor of MERSPLpro interacting with its 271E *** proof-ofconcept findings demonstrated that PLpro is a valid target for the development of broad-spectrum anticoronavirus *** orally administered F0213 may serve as a promising lead compound for combating the ongoing COVID-19 pandemic and future coronavirus outbreaks.

关键词： protease inhibitor coronavirus Nsp3 antiviral

Identification of novel small-molecule inhibitors of SARS-CoV-2 by chemical genetics

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Acta Pharmaceutica Sinica B 2024年第9期14卷 4028-4044页

作者： Chris Chun-Yiu chan Qian Guo Jasper Fuk-woo chan Kaiming Tang Jian-Piao Cai Kenn Ka-Heng Chik Yixin Huang Mei Dai Bo Qin Chon Phin Ong Allen Wing-Ho Chu Wan-Mui chan Jonathan Daniel Ip Lei Wen Jessica Oi-Ling Tsang Tong-Yun Wang Yubin Xie Zhenzhi Qin Jianli Cao Zi-Wei Ye Hin Chu Kelvin Kai-Wang To Xing-Yi Ge Tao Ni Dong-Yan Jin Sheng Cui Kwok-Yung Yuen Shuofeng Yuan State Key Laboratory of Emerging Infectious Diseases Carol Yu Centre for InfectionDepartment of MicrobiologySchool of Clinical MedicineLi Ka Shing Faculty of Medicinethe University of Hong KongPokfulamHong Kong SAR 999077China Department of Infectious Diseases and Microbiology the University of Hong Kong-Shenzhen HospitalShenzhen 518000China Centre for Virology Vaccinology and TherapeuticsHong Kong Science and Technology ParkHong Kong SAR 999077China Academician Workstation of Hainan Province Hainan Medical University-the University of Hong Kong Joint Laboratory of Tropical Infectious DiseasesHaikou 571100China School of Biomedical Sciences Li Ka Shing Faculty of Medicinethe University of Hong KongPokfulamHong Kong SAR 999077China NHC Key Laboratory of Systems Biology of Pathogens Institute of Pathogen Biology Chinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100730China College of Biology Hunan Provincial Key Laboratory of Medical VirologyHunan UniversityChangsha 410082China

There are only eight approved small molecule antiviral drugs for treating *** them,four are nucleotide analogues(remdesivir,JT001,molnupiravir,and azvudine),while the other four are protease inhibitors(nirmatrelvir,ensitrelvir,leritrelvir,and simnotrelvir-ritonavir).Antiviral resistance,unfavourable drug‒drug interaction,and toxicity have been reported in previous *** there is a dearth of new treatment options for *** this work,a three-tier cell-based screening was employed to identify novel compounds with anti-SARS-CoV-2 *** compound,designated 172,demonstrated broad-spectrum antiviral activity against multiple human pathogenic coronaviruses and different SARS-CoV-2 variants of *** studies validated by reverse genetics showed that compound 172 inhibits the 3-chymotrypsin-like protease(3CLpro)by binding to an allosteric site and reduces 3CLpro dimerization.A drug synergistic checkerboard assay demonstrated that compound 172 can achieve drug synergy with nirmatrelvir in *** vivo studies confirmed the antiviral activity of compound 172 in both Golden Syrian Hamsters and K18 humanized ACE2 ***,this study identified an alternative druggable site on the SARS-CoV-23CLpro,proposed a potential combination therapy with nirmatrelvir to reduce the risk of antiviral resistance and shed light on the development of allosteric protease inhibitors for treating a range of coronavirus diseases.

关键词： SARS-CoV-2 High throughput screening Broad-spectrum antiviral treatment 3CLpro inhibitor Allosteric-site inhibitor Animal models Chemical genetics Reverse genetics

Dosimetry of the Photo Neutron Produced in Medical Linear Accelerators

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Dosimetry of the Photo Neutron Produced in Medical Linear Ac...

Melatonin modulates adiponectin expression on murine colitis with sleep deprivation

The Second Asian and Oceanic Congress for Radiation Protection

作者： Bon Cheol KOO Hong Suk KIM Jae-Seong LEE chan woo JEONG Korea Institute of Nuclear Safety Daejeon Republic of Korea Korea Institute of Nuclear Safety Daejeon Republic of Korea Korea Institute of Nuclear Safety Daejeon Republic of Korea Korea Institute of Nuclear Safety Daejeon Republic of Korea

Currently, medical linear accelerators （LINACs） are the most common method of radiotherapy for tumor treatments and more than 90 LINACs are installed and operated in Korea in 2005. To increase the treatment efficiency, LINACs are trending toward higher energy（more than 15MV） nowadays. Meanwhile, the increased photon energy above about 8MV can produce undesired photo neutrons through photonuclear reaction between photon and surrounding materials in LINAC. In this study, the neutron generation and flux around the head geometry of a Varian Clinac 2100C LINAC has been simulated by a Monte Carlo calculation to evaluate photo neutron dose. Monte Carlo calculation using the MCNPX code has been performed for two different photons （generated from Varian 10MV, Varian 15MV） for three different field sizes （0ì 0 cm2, 10ì 10 cm2,20ì 20 cm2）. To compare with the calculation results, additional experimental measurements have been conducted by bubbledetectors on neutron dose and neutron energy spectrum.

关键词： Photo Neutrons Linear Accelerators Bubble Detectors

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World Journal of Gastroenterology 2016年第33期22卷 7559-7568页

作者： Tae Kyun Kim Young Sook Park Haing-woon Baik Jin Hyun Jun Eun Kyung Kim Jae woong Sull Ho Joong Sung Jin woo Choi Sook Hee Chung Myung chan Gye Ju Yeon Lim Jun Bong Kim Seong Hwan Kim Department of Gastroenterology Eulji University School of MedicineEulji Hospital Department of Biochemistry and Molecular Biology Eulji University School of Medicine Departemnt of Biomedical Laboratory Science Graduate School of Health ScienceEulji University Departemnt of Senior Healthcare BK21 plus ProgramGraduate SchoolEulji University Department of Pathology Eulji University School of Medicine Department of Gastroenterology Ajou University School of Medicine Department of Life Science and Institute of Natural Sciences Hanyang University

AIM To determine adiponectin expression in colonic tissue of murine colitis and systemic cytokine expression after melatonin treatments and sleep *** The following five groups of C57BL/6 mice were used in this study:(1) group Ⅰ,control;(2) group Ⅱ,2% DSS induced colitis for 7 d;(3) group Ⅲ,2% DSS induced colitis and melatonin treatment;(4) group Ⅳ,2% DSS induced colitis with sleep deprivation(SD) using specially designed and modified multiple platform water baths; and(5) group V,2% DSS induced colitis with SD and melatonin treatment. Melatonin(10 mg/kg) or saline was intraperitoneally injected daily to mice for 4 d. The body weight was monitored daily. The degree of colitis was evaluated histologically after sacrificing the mice. Immunohistochemical staining and Western blot analysis was performed using anti-adiponectin antibody. After sampling by intracardiac punctures,levels of serum cytokines were measured by ELISA. RESULTS Sleep deprivation in water bath exacerbated DSS induced colitis and worsened weight loss. Melatonin injection not only alleviated the severity of mucosal injury,but also helped survival during stressful condition. The expression level of adiponectin in mucosa was decreased in colitis,with the lowest level observed in colitis combined with sleep deprivation. Melatonin injection significantly(P < 0.05) recovered the expression of adiponectin. The expression levels of IL-6 and IL-17 were increased in the serum of mice with DSS colitis but decreased after melatonin injection. CONCLUSION This study suggested that melatonin modulated adiponectin expression in colonic tissue and melatonin and adiponectin synergistically potentiated antiinflammatory effects on colitis with sleep deprivation.

关键词： Colitis Melatonin Adiponectin Sleep deprivation