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Chua MLK, Hakansson AK, Ong EHW, Hong BH, Miao JJ, Sim AYL, Tan JSH, Tan KM, Lee GCJ, Low KP, Tuan JKL, Tan TWK, Wang MLC, Yeong JPS, Tan MCS, Lee LS, Kanesvaran R, Zhao X, Ho J, Spratt DE, Schaeffer EM, Tay K, Liu Y, Davicioni E, Khor LY. Transcriptomic analyses of localized prostate cancers of East Asian and North American men reveal race-specific luminal-basal and microenvironmental differences. Cancer Commun (Lond) 2023; 43:1164-1168. [PMID: 37700560 PMCID: PMC10565378 DOI: 10.1002/cac2.12467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2023] [Revised: 03/27/2023] [Accepted: 07/07/2023] [Indexed: 09/14/2023] Open
Affiliation(s)
- Melvin L. K. Chua
- Division of Radiation OncologyNational Cancer Centre SingaporeSingaporeSingapore
- Duke‐NUS Medical SchoolSingaporeSingapore
- Division of Medical SciencesNational Cancer Centre SingaporeSingaporeSingapore
| | | | - Enya H. W. Ong
- Division of Medical SciencesNational Cancer Centre SingaporeSingaporeSingapore
| | - Boon Hao Hong
- Division of Medical SciencesNational Cancer Centre SingaporeSingaporeSingapore
| | - Jing Jing Miao
- Division of Medical SciencesNational Cancer Centre SingaporeSingaporeSingapore
- Department of Nasopharyngeal CarcinomaState Key Laboratory of Oncology in South ChinaCollaborative Innovation Center for Cancer MedicineGuangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and TherapySun Yat‐sen University Cancer CenterGuangzhouGuangdongP. R. China
| | - Adelene Y. L. Sim
- Duke‐NUS Medical SchoolSingaporeSingapore
- Division of Medical SciencesNational Cancer Centre SingaporeSingaporeSingapore
| | - Janice S. H. Tan
- Division of Radiation OncologyNational Cancer Centre SingaporeSingaporeSingapore
| | - Kah Min Tan
- Division of Medical SciencesNational Cancer Centre SingaporeSingaporeSingapore
| | - Gabrielle C. J. Lee
- Faculty of MedicineNursing and Health SciencesMonash UniversityVictoriaAustralia
| | - Kar Perng Low
- Division of Medical SciencesNational Cancer Centre SingaporeSingaporeSingapore
| | - Jeffrey K. L. Tuan
- Division of Radiation OncologyNational Cancer Centre SingaporeSingaporeSingapore
- Duke‐NUS Medical SchoolSingaporeSingapore
| | - Terence W. K. Tan
- Division of Radiation OncologyNational Cancer Centre SingaporeSingaporeSingapore
- Duke‐NUS Medical SchoolSingaporeSingapore
| | - Michael L. C. Wang
- Division of Radiation OncologyNational Cancer Centre SingaporeSingaporeSingapore
- Duke‐NUS Medical SchoolSingaporeSingapore
| | - Joe P. S. Yeong
- Department of Anatomical PathologySingapore General HospitalSingaporeSingapore
| | | | - Lui Shiong Lee
- Duke‐NUS Medical SchoolSingaporeSingapore
- Department of UrologySengkang General HospitalSingaporeSingapore
| | - Ravindran Kanesvaran
- Duke‐NUS Medical SchoolSingaporeSingapore
- Division of Medical OncologyNational Cancer Centre SingaporeSingaporeSingapore
| | | | | | - Daniel E. Spratt
- Department of Radiation OncologyUniversity Hospitals Seidman Cancer CenterCase Comprehensive Cancer CenterClevelandOHUSA
| | - Edward M. Schaeffer
- Department of UrologyNorthwestern University Feinberg School of MedicineChicagoILUSA
| | - Kae‐Jack Tay
- Duke‐NUS Medical SchoolSingaporeSingapore
- Department of UrologySingapore General HospitalSingaporeSingapore
| | | | | | - Li Yan Khor
- Duke‐NUS Medical SchoolSingaporeSingapore
- Department of Anatomical PathologySingapore General HospitalSingaporeSingapore
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Zhang T, Wei Y, Hong BH, Sumiyoshi T, Ong EHW, Zeng H, Li Y, Ng C, Pan J, Fang B, Wang B, Wu J, Wang H, Akamatsu S, Chua MLK, Ye D, Zhu Y. Development and validation of a nomogram (APGRC) to predict the presence of germline DNA damage repair pathogenic variants in Asian patients with prostate cancer. Clin Transl Med 2023; 13:e1411. [PMID: 37700486 PMCID: PMC10497832 DOI: 10.1002/ctm2.1411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2023] [Revised: 08/29/2023] [Accepted: 09/04/2023] [Indexed: 09/14/2023] Open
Affiliation(s)
- Tingwei Zhang
- Department of UrologyFudan University Shanghai Cancer CenterShanghaiChina
- Department of OncologyShanghai Medical CollegeFudan UniversityShanghaiChina
- Shanghai Genitourinary Cancer InstituteShanghaiChina
| | - Yu Wei
- Department of UrologyFudan University Shanghai Cancer CenterShanghaiChina
- Department of OncologyShanghai Medical CollegeFudan UniversityShanghaiChina
- Shanghai Genitourinary Cancer InstituteShanghaiChina
| | - Boon Hao Hong
- Division of Medical SciencesNational Cancer Centre SingaporeSingapore
| | - Takayuki Sumiyoshi
- Department of UrologyKyoto University Graduate School of MedicineKyotoJapan
| | - Enya Hui Wen Ong
- Division of Medical SciencesNational Cancer Centre SingaporeSingapore
| | - Hao Zeng
- Department of UrologyInstitute of UrologyWest China HospitalSichuan UniversityChengduChina
| | - Yonghong Li
- Department of UrologySun Yat‐Sen University Cancer CenterState Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer MedicineGuangzhouChina
| | - Chi‐Fai Ng
- Department of Surgeryand SH Ho Urology CenterChinese University of Hong KongHong KongHong Kong
| | - Jian Pan
- Department of UrologyFudan University Shanghai Cancer CenterShanghaiChina
- Department of OncologyShanghai Medical CollegeFudan UniversityShanghaiChina
- Shanghai Genitourinary Cancer InstituteShanghaiChina
| | - Bangwei Fang
- Department of UrologyFudan University Shanghai Cancer CenterShanghaiChina
- Department of OncologyShanghai Medical CollegeFudan UniversityShanghaiChina
- Shanghai Genitourinary Cancer InstituteShanghaiChina
| | - Beihe Wang
- Department of UrologyFudan University Shanghai Cancer CenterShanghaiChina
- Department of OncologyShanghai Medical CollegeFudan UniversityShanghaiChina
- Shanghai Genitourinary Cancer InstituteShanghaiChina
| | - Junlong Wu
- Department of UrologyFudan University Shanghai Cancer CenterShanghaiChina
- Department of OncologyShanghai Medical CollegeFudan UniversityShanghaiChina
- Shanghai Genitourinary Cancer InstituteShanghaiChina
| | - Hongkai Wang
- Department of UrologyFudan University Shanghai Cancer CenterShanghaiChina
- Department of OncologyShanghai Medical CollegeFudan UniversityShanghaiChina
- Shanghai Genitourinary Cancer InstituteShanghaiChina
| | - Shusuke Akamatsu
- Department of UrologyKyoto University Graduate School of MedicineKyotoJapan
- Department of UrologyNagoya University Graduate School of MedicineAichiJapan
| | - Melvin Lee Kiang Chua
- Division of Medical SciencesNational Cancer Centre SingaporeSingapore
- Department of Head and Neck and Thoracic CancersDivision of Radiation OncologyNational Cancer Centre SingaporeSingapore
- Oncology Academic ProgrammeDuke‐NUS Medical SchoolSingapore
| | - Dingwei Ye
- Department of UrologyFudan University Shanghai Cancer CenterShanghaiChina
- Department of OncologyShanghai Medical CollegeFudan UniversityShanghaiChina
- Shanghai Genitourinary Cancer InstituteShanghaiChina
| | - Yao Zhu
- Department of UrologyFudan University Shanghai Cancer CenterShanghaiChina
- Department of OncologyShanghai Medical CollegeFudan UniversityShanghaiChina
- Shanghai Genitourinary Cancer InstituteShanghaiChina
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3
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Labadin J, Hong BH, Tiong WK, Gill BS, Perera D, Rigit ARH, Singh S, Tan CV, Ghazali SM, Jelip J, Mokhtar N, Rashid NBA, Bakar HBA, Lim JH, Taib NM, George A. Development and user testing study of MozzHub: a bipartite network-based dengue hotspot detector. Multimed Tools Appl 2022; 82:17415-17436. [PMID: 36404933 PMCID: PMC9649007 DOI: 10.1007/s11042-022-14120-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Revised: 10/14/2022] [Accepted: 10/25/2022] [Indexed: 06/16/2023]
Abstract
Traditionally, dengue is controlled by fogging, and the prime location for the control measure is at the patient's residence. However, when Malaysia was hit by the first wave of the Coronavirus disease (COVID-19), and the government-imposed movement control order, dengue cases have decreased by more than 30% from the previous year. This implies that residential areas may not be the prime locations for dengue-infected mosquitoes. The existing early warning system was focused on temporal prediction wherein the lack of consideration for spatial component at the microlevel and human mobility were not considered. Thus, we developed MozzHub, which is a web-based application system based on the bipartite network-based dengue model that is focused on identifying the source of dengue infection at a small spatial level (400 m) by integrating human mobility and environmental predictors. The model was earlier developed and validated; therefore, this study presents the design and implementation of the MozzHub system and the results of a preliminary pilot test and user acceptance of MozzHub in six district health offices in Malaysia. It was found that the MozzHub system is well received by the sample of end-users as it was demonstrated as a useful (77.4%), easy-to-operate system (80.6%), and has achieved adequate client satisfaction for its use (74.2%).
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Affiliation(s)
- Jane Labadin
- Faculty of Computer Science and Information Technology, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Malaysia
| | - Boon Hao Hong
- Faculty of Computer Science and Information Technology, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Malaysia
| | - Wei King Tiong
- Faculty of Computer Science and Information Technology, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Malaysia
| | | | - David Perera
- Institute for Health and Community Medicine, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Malaysia
| | | | - Sarbhan Singh
- Institute for Medical Research, Ministry of Health, Kuala Lumpur, Malaysia
| | - Cia Vei Tan
- Institute for Medical Research, Ministry of Health, Kuala Lumpur, Malaysia
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4
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Gill BS, Jayaraj VJ, Singh S, Mohd Ghazali S, Cheong YL, Md Iderus NH, Sundram BM, Aris TB, Mohd Ibrahim H, Hong BH, Labadin J. Modelling the Effectiveness of Epidemic Control Measures in Preventing the Transmission of COVID-19 in Malaysia. Int J Environ Res Public Health 2020; 17:E5509. [PMID: 32751669 PMCID: PMC7432794 DOI: 10.3390/ijerph17155509] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 06/14/2020] [Accepted: 07/02/2020] [Indexed: 01/10/2023]
Abstract
Malaysia is currently facing an outbreak of COVID-19. We aim to present the first study in Malaysia to report the reproduction numbers and develop a mathematical model forecasting COVID-19 transmission by including isolation, quarantine, and movement control measures. We utilized a susceptible, exposed, infectious, and recovered (SEIR) model by incorporating isolation, quarantine, and movement control order (MCO) taken in Malaysia. The simulations were fitted into the Malaysian COVID-19 active case numbers, allowing approximation of parameters consisting of probability of transmission per contact (β), average number of contacts per day per case (ζ), and proportion of close-contact traced per day (q). The effective reproduction number (Rt) was also determined through this model. Our model calibration estimated that (β), (ζ), and (q) were 0.052, 25 persons, and 0.23, respectively. The (Rt) was estimated to be 1.68. MCO measures reduce the peak number of active COVID-19 cases by 99.1% and reduce (ζ) from 25 (pre-MCO) to 7 (during MCO). The flattening of the epidemic curve was also observed with the implementation of these control measures. We conclude that isolation, quarantine, and MCO measures are essential to break the transmission of COVID-19 in Malaysia.
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Affiliation(s)
- Balvinder Singh Gill
- Institute for Medical Research (IMR), Ministry of Health, Kuala Lumpur 50588, Malaysia; (B.S.G.); (S.S.); (S.M.G.); (Y.L.C.); (N.H.M.I.); (B.M.S.); (T.B.A.)
| | - Vivek Jason Jayaraj
- Department of Social and Preventive Medicine, Medical Faculty, University Malaya, Kuala Lumpur 50603, Malaysia;
- Ministry of Health, Malaysia, Putrajaya 62590, Malaysia;
| | - Sarbhan Singh
- Institute for Medical Research (IMR), Ministry of Health, Kuala Lumpur 50588, Malaysia; (B.S.G.); (S.S.); (S.M.G.); (Y.L.C.); (N.H.M.I.); (B.M.S.); (T.B.A.)
| | - Sumarni Mohd Ghazali
- Institute for Medical Research (IMR), Ministry of Health, Kuala Lumpur 50588, Malaysia; (B.S.G.); (S.S.); (S.M.G.); (Y.L.C.); (N.H.M.I.); (B.M.S.); (T.B.A.)
| | - Yoon Ling Cheong
- Institute for Medical Research (IMR), Ministry of Health, Kuala Lumpur 50588, Malaysia; (B.S.G.); (S.S.); (S.M.G.); (Y.L.C.); (N.H.M.I.); (B.M.S.); (T.B.A.)
| | - Nuur Hafizah Md Iderus
- Institute for Medical Research (IMR), Ministry of Health, Kuala Lumpur 50588, Malaysia; (B.S.G.); (S.S.); (S.M.G.); (Y.L.C.); (N.H.M.I.); (B.M.S.); (T.B.A.)
| | - Bala Murali Sundram
- Institute for Medical Research (IMR), Ministry of Health, Kuala Lumpur 50588, Malaysia; (B.S.G.); (S.S.); (S.M.G.); (Y.L.C.); (N.H.M.I.); (B.M.S.); (T.B.A.)
| | - Tahir Bin Aris
- Institute for Medical Research (IMR), Ministry of Health, Kuala Lumpur 50588, Malaysia; (B.S.G.); (S.S.); (S.M.G.); (Y.L.C.); (N.H.M.I.); (B.M.S.); (T.B.A.)
| | | | - Boon Hao Hong
- Faculty of Computer Science and Information Technology, Universiti Malaysia Sarawak, Kota Samarahan 94300, Malaysia;
| | - Jane Labadin
- Faculty of Computer Science and Information Technology, Universiti Malaysia Sarawak, Kota Samarahan 94300, Malaysia;
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5
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Cizmeciyan MN, Kim JW, Bae S, Hong BH, Rotermund F, Sennaroglu A. Graphene mode-locked femtosecond Cr:ZnSe laser at 2500 nm. Opt Lett 2013; 38:341-343. [PMID: 23381431 DOI: 10.1364/ol.38.000341] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We report, for the first time to our knowledge, femtosecond pulse generation from a graphene mode-locked Cr:ZnSe laser at 2500 nm. To minimize the insertion losses at the lasing wavelength, high-quality monolayer graphene transferred on a CaF(2) substrate was used in the experiments. Once mode-locking was initiated, the laser generated a stable train of 226 fs pulses with a time-bandwidth product of 0.39. The mode-locked laser operated at a pulse repetition rate of 77 MHz and produced 80 mW output power with an incident pump power of 1.6 W. To our knowledge, this is the longest laser wavelength at which graphene-based passive mode-locking has been demonstrated to date.
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Affiliation(s)
- M N Cizmeciyan
- Laser Research Laboratory, Department of Physics, Koç University, Istanbul, Turkey
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6
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An DH, Jung IS, Kang J, Chang HS, Hong BH, Hong S, Lee MY, Kim Y, Yang TK, Chai JS. The negative hydrogen Penning ion gauge ion source for KIRAMS-13 cyclotron. Rev Sci Instrum 2008; 79:02A520. [PMID: 18315141 DOI: 10.1063/1.2812797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The cold-cathode-type Penning ion gauge (PIG) ion source for the internal ion source of KIRAMS-13 cyclotron has been used for generation of negative hydrogen ions. The dc H-beam current of 650 microA from the PIG ion source with the Dee voltage of 40 kV and arc current of 1.0 A is extrapolated from the measured dc extraction beam currents at the low extraction dc voltages. The output optimization of PIG ion source in the cyclotron has been carried out by using various chimneys with different sizes of the expansion gap between the plasma boundary and the chimney wall. This paper presents the results of the dc H-extraction measurement and the expansion gap experiment.
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Affiliation(s)
- D H An
- Laboratory of Particle Accelerator Development, Korea Institute of Radiological and Medical Sciences (KIRAMS), Seoul, Republic of Korea.
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Kim HH, Kim KH, Kim DH, Kim MC, Kim BS, Kim YW, Kim YI, Kim YH, Kim W, Kim WW, Kim JJ, Kim TB, Ryu SY, Ryu SW, Min YD, Park YC, Park CH, Baik HK, Song KY, Yang HK, Lee KY, Lee BE, Lee BH, Lee YJ, Lee WK, Lee JH, Lee HJ, Jeon HM, Jung SJ, Cho GS, Chin HM, Choi SH, Choi YB, Han SU, Hur KY, Hur YS, Hyung WJ, Hong BH. Nationwide Survey of Laparoscopic Gastric Surgery in Korea, 2004. ACTA ACUST UNITED AC 2005. [DOI: 10.5230/jkgca.2005.5.4.295] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- H H Kim
- Department of Surgery, College of Medicine, Seoul National University
| | - K H Kim
- Department of Surgery, DongKang Medical Center
| | - D H Kim
- Department of Surgery, Pusan National University
| | - M C Kim
- Department of Surgery, Dong-A University
| | - B S Kim
- Department of Surgery, Ulsan University
| | | | - Y I Kim
- 7Department of Surgery, Ewha Woman's University
| | - Y H Kim
- Department of Surgery, Gangneung Asan Hospital
| | - W Kim
- Department of Surgery, The Catholic University of Korea
| | - W W Kim
- Department of Surgery, Pochon CHA University
| | - J J Kim
- Department of Surgery, The Catholic University of Korea
| | - T B Kim
- Department of Surgery, Kyungpook National University
| | - S Y Ryu
- Department of Surgery, Chonnam National University
| | - S W Ryu
- Department of Surgery, Keimyung University
| | - Y D Min
- Department of Surgery, Chosun University
| | - Y C Park
- Department of Surgery, Dankook University
| | - C H Park
- Department of Surgery, The Catholic University of Korea
| | - H K Baik
- Department of Surgery, Hanyang University
| | - K Y Song
- Department of Surgery, The Catholic University of Korea
| | - H K Yang
- Department of Surgery, College of Medicine, Seoul National University
| | - K Y Lee
- Department of Surgery, Kyung Hee University
| | - B E Lee
- Department of Surgery, Changwon Fatima Hospital
| | - B H Lee
- Department of Surgery, Hallym University
| | - Y J Lee
- Department of Surgery, Gyeongsang National University
| | - W K Lee
- Department of Surgery, Gachon Medical School
| | - J H Lee
- 7Department of Surgery, Ewha Woman's University
| | - H J Lee
- Department of Surgery, College of Medicine, Seoul National University
| | - H M Jeon
- Department of Surgery, The Catholic University of Korea
| | - S J Jung
- Department of Surgery, Daegu Catholic University
| | - G S Cho
- Department of Surgery, Soonchunhyang University
| | - H M Chin
- Department of Surgery, The Catholic University of Korea
| | - S H Choi
- Department of Surgery, Yonsei University
| | - Y B Choi
- Department of Surgery, Ulsan University
| | - S U Han
- Department of Surgery, Ajou University
| | - K Y Hur
- Department of Surgery, Hansol Hospital
| | - Y S Hur
- Department of Surgery, Inha University
| | - W J Hyung
- Department of Surgery, Yonsei University
| | - B H Hong
- Department of Surgery, Eulji University
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Manojkumar TK, Choi HS, Hong BH, Tarakeshwar P, Kim KS. p-benzoquinone-benzene clusters as potential nanomechanical devices: A theoretical study. J Chem Phys 2004; 121:841-6. [PMID: 15260614 DOI: 10.1063/1.1760745] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The equilibrium structures and binding energies of the benzene complexes of p-benzoquinones (PBQ) and its negatively charged anionic species (PBQ- and PBQ2-) have been investigated theoretically using second-order Møller-Plesset calculations. While neutral p-benzoquinone-benzene clusters (PBQ-Bz) prefer to have a parallel displaced geometry (P-c), CH...pi interactions (T-shaped geometries) prevail in the di-anionic PBQ-benzene (PBQ2- -Bz) complexes (T-e2-). Studies on dianionic p-benzoquinone-benzene clusters showed that two nonbonded intermolecular interactions compete in the most stable conformation. One is H-bonding interaction (C-H...O type) between carbonyl oxygen of p-benzoquinone and one of the hydrogen atoms of benzene, and the other is a pi-H interaction between pi-electron cloud of PBQ2- and another hydrogen atom of benzene. Blueshifted H-bonds were observed in T-shaped clusters. The changes in the geometrical preference of PBQ-Bz complex upon addition of electrons would be useful in designing optimized molecular mechanical devices based on the edge-to-face and face-to-face aromatic interactions.
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Affiliation(s)
- T K Manojkumar
- National Creative Research Initiative Center for Superfunctional Materials, Department of Chemistry, Division of Molecular and Life Sciences, Pohang University of Science and Technology, Hyoja-Dong, Namgu, Pohang 790-784, South Korea
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9
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Yang HK, Kim MC, Kim YW, Kim YI, Kim EK, Kim HH, Park KK, Bae JM, Baik HG, Sul JY, Shin SH, Lee YB, Lee JM, Lee JH, Lee HJ, Jeon HM, Cho GS, Choi SH, Choi YB, Han SU, Han HS, Hur KY, Hyung WJ, Hong BH. Nationwide Survey of Laparoscopic Gastric Surgery in Korea. ACTA ACUST UNITED AC 2004. [DOI: 10.5230/jkgca.2004.4.3.196] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- H K Yang
- Seoul National University, Korea
| | | | - Y W Kim
- National Cancer Center, Korea
| | - Y I Kim
- Ewha Woman's University, Korea
| | - E K Kim
- Catholic University of Korea, Korea
| | - H H Kim
- Seoul National University, Korea
| | | | - J M Bae
- National Cancer Center, Korea
| | | | - J Y Sul
- Chungnam National University, Korea
| | | | - Y B Lee
- Changwon Fatima Hospital, Korea
| | - J M Lee
- Jeonju Presbyterian Medical Center, Korea
| | - J H Lee
- Ewha Woman's University, Korea
| | - H J Lee
- Seoul National University, Korea
| | - H M Jeon
- Catholic University of Korea, Korea
| | - G S Cho
- Soonchunhyang University, Korea
| | | | | | | | - H S Han
- Seoul National University, Korea
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10
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Nam GH, Jang DS, Cha SS, Lee TH, Kim DH, Hong BH, Yun YS, Oh BH, Choi KY. Maintenance of alpha-helical structures by phenyl rings in the active-site tyrosine triad contributes to catalysis and stability of ketosteroid isomerase from Pseudomonas putida biotype B. Biochemistry 2001; 40:13529-37. [PMID: 11695900 DOI: 10.1021/bi015547k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [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: 11/29/2022]
Abstract
Ketosteroid isomerase (KSI) from Pseudomonas putida biotype B is a homodimeric enzyme catalyzing an allylic rearrangement of Delta5-3-ketosteroids at rates comparable with the diffusion-controlled limit. The tyrosine triad (Tyr14.Tyr55.Tyr30) forming a hydrogen-bond network in the apolar active site of KSI has been characterized in an effort to identify the roles of the phenyl rings in catalysis, stability, and unfolding of the enzyme. The replacement of Tyr14, a catalytic residue, with serine resulted in a 33-fold decrease of kcat, while the replacements of Tyr30 and Tyr55 with serine decreased kcat by 4- and 51-fold, respectively. The large decrease of kcat for Y55S could be due to the structural perturbation of alpha-helix A3, which results in the reorientation of the active-site residues as judged by the crystal structure of Y55S determined at 2.2 A resolution. Consistent with the analysis of the Y55S crystal structure, the far-UV circular dichroism spectra of Y14S, Y30S, and Y55S indicated that the elimination of the phenyl ring of the tyrosine reduced significantly the content of alpha-helices. Urea-induced equilibrium unfolding experiments revealed that the DeltaG(U)H2O values of Y14S, Y30S, and Y55S were significantly decreased by 11.9, 13.7, and 9.5 kcal/mol, respectively, as compared with that of the wild type. A characterization of the unfolding kinetics based on PhiU-value analysis indicates that the interactions mediated by the tyrosine triad in the native state are very resistant to unfolding. Taken together, our results demonstrate that the internal packing by the phenyl rings in the active-site tyrosine triad contributes to the conformational stability and catalytic activity of KSI by maintaining the structural integrity of the alpha-helices.
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Affiliation(s)
- G H Nam
- Division of Molecular and Life Sciences National Research Laboratory of Protein Engineering, and National CRI Center for Biomolecular Recognition, Pohang University of Science and Technology, Pohang, 790-784, South Korea
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11
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Hong BH, Lee JY, Lee CW, Kim JC, Bae SC, Kim KS. Self-assembled arrays of organic nanotubes with infinitely long one-dimensional H-bond chains. J Am Chem Soc 2001; 123:10748-9. [PMID: 11674012 DOI: 10.1021/ja016526g] [Citation(s) in RCA: 229] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- B H Hong
- National Creative Research Initiative Center for Superfunctional Materials, and Department of Chemistry, Division of Molecular and Life Sciences, Pohang University of Science and Technology, Pohang 790-784, Korea
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12
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Abstract
We report the synthesis of single-crystalline silver nanowires of atomic dimensions. The ultrathin silver wires with 0.4 nanometer width grow up to micrometer-scale length inside the pores of self-assembled calix[4]hydroquinone nanotubes by electro-/photochemical redox reaction in an ambient aqueous phase. The present subnanowires are very stable under ambient air and aqueous environments, unlike previously reported metal wires of approximately 1 nanometer diameter, which existed only transiently in ultrahigh vacuum. The wires exist as coherently oriented three-dimensional arrays of ultrahigh density and thus could be used as model systems for investigating one-dimensional phenomena and as nanoconnectors for designing nanoelectronic devices.
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Affiliation(s)
- B H Hong
- National Creative Research Initiative Center for Superfunctional Materials, Department of Chemistry, Division of Molecular and Life Sciences, Pohang University of Science and Technology, Hyojadong, Namgu, Pohang 790-784, Korea
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Choi G, Ha NC, Kim MS, Hong BH, Oh BH, Choi KY. Pseudoreversion of the catalytic activity of Y14F by the additional substitution(s) of tyrosine with phenylalanine in the hydrogen bond network of delta 5-3-ketosteroid isomerase from Pseudomonas putida biotype B. Biochemistry 2001; 40:6828-35. [PMID: 11389596 DOI: 10.1021/bi002767+] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [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: 11/28/2022]
Abstract
Delta5-3-ketosteroid isomerase (KSI) from Pseudomonas putida Biotype B catalyzes the allylic isomerization of Delta5-3-ketosteroids to their conjugated Delta4-isomers via a dienolate intermediate. Two electrophilic catalysts, Tyr-14 and Asp-99, are involved in a hydrogen bond network that comprises Asp-99 Odelta2...O of Wat504...Tyr-14 Oeta...Tyr-55 Oeta.Tyr-30 Oeta in the active site of P. putida KSI. Even though neither Tyr-30 nor Tyr-55 plays an essential role in catalysis by the KSI, the catalytic activity of Y14F could be increased ca. 26-51-fold by the additional Y30F and/or Y55F mutation in the hydrogen bond network. To identify the structural basis for the pseudoreversion in the KSI, crystal structures of Y14F and Y14F/Y30F/Y55F have been determined at 1.8 and 2.0 A resolution, respectively. Comparisons of the two structures near the catalytic center indicate that the hydrogen bond between Asp-99 Odelta2 and C3-O of the steroid, which is perturbed by the Y14F mutation, can be partially restored to that in the wild-type enzyme by the additional Y30F/Y55F mutations. The kinetic parameters of the tyrosine mutants with the additional D99N or D99L mutation also support the idea that Asp-99 contributes to catalysis more efficiently in Y14F/Y30F/Y55F than in Y14F. In contrast to the catalytic mechanism of Y14F, the C4 proton of the steroid substrate was found to be transferred to the C6 position in Y14F/Y30F/Y55F with little exchange of the substrate 4beta-proton with a solvent deuterium based on the reaction rate in D2O. Taken together, our findings strongly suggest that the improvement in the catalytic activity of Y14F by the additional Y30F/Y55F mutations is due to the changes in the structural integrity at the catalytic site and the resulting restoration of the proton-transfer mechanism in Y14F/Y30F/Y55F.
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Affiliation(s)
- G Choi
- Division of Molecular and Life Sciences, Pohang University of Science and Technology, Pohang, Kyungbuk, South Korea
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Affiliation(s)
- H S Son
- National Creative Research Initiative Center for Superfunctional Materials, Department of Chemistry Division of Molecular and Life Sciences Pohang University of Science and Technology Hyojadong, Namgu, Pohang 790-784, Korea
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Abstract
Between 1966 and 1987, 116 patients with 119 episodes of perforation were admitted to Box Hill Hospital into one surgical unit, and 91 patients with 92 episodes were admitted into the other, with patients being admitted in alternate weeks. In the former unit, in order to avoid surgery in those patients whose ulcers had sealed spontaneously, a deliberative approach was followed according to a strict protocol--involving a deliberate time delay in surgical decision-making. In the latter unit, a more conventional approach was adopted, and patients in that unit are used as a retrospective comparison. In the first unit, of 115 episodes which followed the protocol, six were unresuscitable, 15 needed immediate surgery and 94 followed a delayed approach. Of that 94, 12 needed surgery at 4-6 h, and a further eight needed later surgery. Seventy-four (68% of 'operable' patients) did not require corrective surgery at all, for their episode of perforation. The operable mortality rate was lower (6% compared with 13%), the bedstay was shorter, the prolonged bedstay rate was lower, and the morbidity was no worse, than those patients treated more conventionally in the second unit.
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Affiliation(s)
- J R Cocks
- Box Hill Hospital, Melbourne, Victoria, Australia
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Counsell RE, Ranade VV, Kline W, Hong BH, Buswink AA. Potential organ or tumor imaging agents XV: radioiodinated phenytoin derivatives. J Pharm Sci 1976; 65:285-7. [PMID: 1255464 DOI: 10.1002/jps.2600650227] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Three radioiodinated phenytoin analogs were synthesized, and tissue distribution studies were conducted in rats. Except for a greater retention of radioactivity following administration of the radioiodinated derivatives, the tissue distribution patterns were qualitatively similar to those found for 14C phenytoin. In nearly all cases, the adrenals, heart, kidneys, and liver displayed the greatest capacity to retain radioactivity. The high uptake of radioactivity observed for the thyroid was attributed to in vivo metabolic deiodination of the radioiodinated derivatives.
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Counsell RE, Ranade VV, Lala LK, Hong BH. Tumor localizing agents. IV. Radioiodinated analogs of 1,1-dichloro-2,2-di(chlorophenyl)ethane. J Med Chem 1968; 11:380-2. [PMID: 5663635 DOI: 10.1021/jm00308a051] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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