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Kim H, Shim JH, Kim S, Park JH, Kim K, Min BI. Unusual Pressure-Induced Quantum Phase Transition from Superconducting to Charge-Density Wave State in Rare-Earth-Based Heusler LuPd_{2}In Compound. Phys Rev Lett 2020; 125:157001. [PMID: 33095605 DOI: 10.1103/physrevlett.125.157001] [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] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Revised: 03/10/2020] [Accepted: 09/10/2020] [Indexed: 06/11/2023]
Abstract
We investigate the pressure effects on the electronic structures and phonon properties of rare-earth-based cubic-Heusler compound LuPd_{2}In, on the basis of ab initio density functional theory. We find the occurrence of intriguing phase transition from the superconducting (SC) to charge-density wave (CDW) state under pressure (P), which is quite unusual in that the pressure is detrimental to the CDW state in usual systems. The SC transition temperature T_{C} of LuPd_{2}In increases first with increasing pressure, up to P_{C}≈28 GPa, above which a quantum phase transition into the CDW state takes place. This extraordinary transition originates from the occurrence of phonon softening instability at a special q=M in the Brillouin zone. We thus propose that LuPd_{2}In is a quite unique material, in which the CDW quantum critical point is realized under the SC dome by applying the pressure.
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Affiliation(s)
- Heejung Kim
- Department of Physics, POSTECH, Pohang 37673, Korea
- MPPHC-CPM, Max Planck POSTECH/Korea Research Initiative, Pohang 37673, Korea
| | - J H Shim
- Department of Physics, POSTECH, Pohang 37673, Korea
- Department of Chemistry, POSTECH, Pohang 37673, Korea
| | - Sooran Kim
- Department of Physics Education, Kyungpook National University, Daegu 41566, Korea
| | - Jae-Hoon Park
- Department of Physics, POSTECH, Pohang 37673, Korea
- MPPHC-CPM, Max Planck POSTECH/Korea Research Initiative, Pohang 37673, Korea
- Division of Advanced Materials Science, POSTECH, Pohang 37673, Korea
| | - Kyoo Kim
- Department of Physics, POSTECH, Pohang 37673, Korea
- MPPHC-CPM, Max Planck POSTECH/Korea Research Initiative, Pohang 37673, Korea
- Korea Atomic Energy Research Institute (KAERI), 111 Daedeok-daero, Daejeon 34057, Korea
| | - B I Min
- Department of Physics, POSTECH, Pohang 37673, Korea
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Kim S, Yi S, Oh M, Jang BG, Nam W, Yoo YC, Lee M, Jeon H, Zoh I, Lee H, Zhang C, Kim KH, Seo J, Shim JH, Chae J, Kuk Y. Surface reconstruction and charge modulation in BaFe 2As 2 superconducting film. J Phys Condens Matter 2018; 30:315001. [PMID: 29916822 DOI: 10.1088/1361-648x/aacd85] [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] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Whether or not epitaxially grown superconducting films have the same bulk-like superconducting properties is an important concern. We report the structure and the electronic properties of epitaxially grown Ba(Fe1-x Co x )2As2 films using scanning tunneling microscopy and scanning tunneling spectroscopy (STS). This film showed a different surface structure, [Formula: see text]R45° reconstruction, from those of as-cleaved surfaces from bulk crystals. The electronic structure of the grown film is different from that in bulk, and it is notable that the film exhibits the same superconducting transport properties. We found that the superconducting gap at the surface is screened at the Ba layer surface in STS measurements, and the charge density wave was observed at the surface in sample in the superconducting state.
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Affiliation(s)
- S Kim
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea
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Oikonomidou PR, Casu C, Yang Z, Crielaard B, Shim JH, Rivella S, Vogiatzi MG. Polycythemia is associated with bone loss and reduced osteoblast activity in mice. Osteoporos Int 2016; 27:1559-1568. [PMID: 26650379 PMCID: PMC5319412 DOI: 10.1007/s00198-015-3412-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Accepted: 11/05/2015] [Indexed: 01/19/2023]
Abstract
UNLABELLED Increased fragility has been described in humans with polycythemia vera (PV). Herein, we describe an osteoporotic phenotype associated with decreased osteoblast activity in a mouse model of PV and another mouse of polycythemia and elevated circulating erythropoietin (EPO). Our results are important for patients with PV or those treated with recombinant EPO (rEPO). INTRODUCTION PV and other myeloproliferative syndromes have been recently associated with an increased risk for fractures. However, the presence of osteoporosis in these patients has not been well documented. EPO, a hormone primarily known to stimulate erythropoiesis, has been shown recently to regulate bone homeostasis in mice. The aim of this study was to examine the bone phenotype of a mouse model of PV and compare it to that of animals with polycythemia caused by elevated circulating EPO. METHODS Bone mass and remodeling were evaluated by micro-computed tomography and histomorphometry. The JAK2(V617F) knock-in mouse, a model of human PV, manifests polycythemia and low circulating EPO levels. Results from this mouse were compared to wild type (wt) controls and the tg6 transgenic mouse that shows polycythemia caused by increased constitutive expression of EPO. RESULTS Compared to wt, both JAK2(V617F) and tg6 mice had a decrease in trabecular bone mass. Tg6 mice showed an additional modest decrease in cortical thickness and cortical bone volume per tissue volume (P < 0.01) suggesting a more severe bone phenotype than JAK2(V617F). Decreased osteoblast numbers and bone formation along with normal osteoclast numbers and activity were found in both mice. CONCLUSIONS This study indicates that PV is associated with low bone mass and decreased osteoblast activity in mice. Our results support future studies of osteoporosis in affected humans. Polycythemia caused by chronically elevated circulating EPO also results in bone loss, and implications on patients treated with rEPO should be evaluated.
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Affiliation(s)
- P R Oikonomidou
- Division of Pediatric Endocrinology, Weill Cornell Medical College, New York, NY, USA.
- Division of Hematology, Children's Hospital of Philadelphia, Abramson Research Center, 3615 Civic Center Blvd., Room 309 F, Philadelphia, PA, 19104, USA.
| | - C Casu
- Division of Pediatric Hematology/Oncology, Weill Cornell Medical College, New York, NY, USA
- Division of Hematology, Children's Hospital of Philadelphia, Abramson Research Center, 3615 Civic Center Blvd., Room 309 F, Philadelphia, PA, 19104, USA
| | - Z Yang
- Department of Medicine, Cancer Center, Weill Cornell Medical College, Belfer Research Building, 413 East 69th Street, 13th Floor, New York, NY,, 10021, USA
| | - B Crielaard
- Division of Pediatric Hematology/Oncology, Weill Cornell Medical College, New York, NY, USA
- Department of Polymer Chemistry and Bioengineering, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, Netherlands
| | - J H Shim
- Department of Pathology and Laboratory medicine, Weill Cornell Medical College, 1300 York Avenue, E-904, New York, NY,, 10065, USA
| | - S Rivella
- Division of Pediatric Hematology/Oncology, Weill Cornell Medical College, New York, NY, USA
- Division of Hematology, Children's Hospital of Philadelphia, Abramson Research Center, 3615 Civic Center Blvd., Room 316 B, Philadelphia, PA, 19104, USA
| | - M G Vogiatzi
- Division of Pediatric Endocrinology, Weill Cornell Medical College, New York, NY, USA
- Division of Endocrinology, Children's Hospital of Philadelphia, 3401 Civic Center Bvld., Philadelphia, PA, 19104, USA
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Kang CJ, Denlinger JD, Allen JW, Min CH, Reinert F, Kang BY, Cho BK, Kang JS, Shim JH, Min BI. Electronic Structure of YbB_{6}: Is it a Topological Insulator or Not? Phys Rev Lett 2016; 116:116401. [PMID: 27035312 DOI: 10.1103/physrevlett.116.116401] [Citation(s) in RCA: 5] [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] [Received: 08/22/2015] [Indexed: 06/05/2023]
Abstract
To finally resolve the controversial issue of whether or not the electronic structure of YbB_{6} is nontrivially topological, we have made a combined study using angle-resolved photoemission spectroscopy (ARPES) of the nonpolar (110) surface and density functional theory (DFT). The flat-band conditions of the (110) ARPES avoid the strong band bending effects of the polar (001) surface and definitively show that YbB_{6} has a topologically trivial B 2p-Yb 5d semiconductor band gap of ∼0.3 eV. Accurate determination of the low energy band topology in DFT requires the use of a modified Becke-Johnson exchange potential incorporating spin-orbit coupling and an on-site Yb 4f Coulomb interaction U as large as 7 eV. The DFT result, confirmed by a more precise GW band calculation, is similar to that of a small gap non-Kondo nontopological semiconductor. Additionally, the pressure-dependent electronic structure of YbB_{6} is investigated theoretically and found to transform into a p-d overlap semimetal with small Yb mixed valency.
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Affiliation(s)
- Chang-Jong Kang
- Department of Physics, PCTP, Pohang University of Science and Technology, (POSTECH) Pohang 37673, Korea
| | - J D Denlinger
- Advanced Light Source, Lawrence Berkeley Laboratory, Berkeley, California 94720, USA
| | - J W Allen
- Department of Physics, Randall Laboratory, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Chul-Hee Min
- Universität Würzburg, Experimentelle Physik VII, 97074 Würzburg, Germany
| | - F Reinert
- Universität Würzburg, Experimentelle Physik VII, 97074 Würzburg, Germany
| | - B Y Kang
- School of Materials Science and Engineering, GIST, Gwangju 61005, Korea
| | - B K Cho
- School of Materials Science and Engineering, GIST, Gwangju 61005, Korea
| | - J-S Kang
- Department of Physics, The Catholic University of Korea, Bucheon 14662, Korea
| | - J H Shim
- Department of Physics, PCTP, Pohang University of Science and Technology, (POSTECH) Pohang 37673, Korea
- Department of Chemistry and Division of Advanced Nuclear Engineering, POSTECH, Pohang 37673, Korea
| | - B I Min
- Department of Physics, PCTP, Pohang University of Science and Technology, (POSTECH) Pohang 37673, Korea
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Kim GA, Shim JH, Kim MJ, Kim SY, Won HJ, Shin YM, Kim PN, Kim KH, Lee SG, Lee HC. Radiofrequency ablation as an alternative to hepatic resection for single small hepatocellular carcinomas. Br J Surg 2015; 103:126-35. [DOI: 10.1002/bjs.9960] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Revised: 08/06/2015] [Accepted: 09/04/2015] [Indexed: 12/21/2022]
Abstract
Abstract
Background
This study aimed to investigate whether radiofrequency ablation (RFA) is an alternative to surgical resection for hepatocellular carcinoma (HCC) within the context of current guidelines.
Methods
This retrospective study included patients with normal portal pressure and serum bilirubin level who initially underwent liver resection or RFA for a single HCC of maximum size 3 cm. Between-group differences in cumulative rates of survival and recurrence specific for HCC were analysed in the entire cohort and in a propensity score-matched cohort.
Results
A total of 604 patients were enrolled, 273 in the liver resection group and 331 in the RFA group. The 5- and 10-year HCC-specific survival rates for the resection and RFA groups were 87·6 versus 82·1 per cent and 59·0 versus 61·2 per cent respectively (P = 0·214), whereas overall 5- and 10-year recurrence-free survival rates for the corresponding groups were 60·6 versus 39·4 per cent and 37·5 versus 25·1 per cent respectively (P < 0·001). In the propensity score-matched cohort (152 pairs), there were no differences in HCC-specific survival (hazard ratio (HR) 1·03 for RFAversus resection; P = 0·899), whereas recurrence-free survival again differed between the treatment groups (HR 1·75; P < 0·001). RFA was independently associated with poorer outcomes in terms of treatment-site recurrence-free survival (adjusted HR 1·66; P = 0·026), but not non-treatment-site recurrence-free survival (adjusted HR 1·15; P = 0·354).
Conclusion
Although RFA carries a higher risk of treatment-site recurrence than hepatic resection, it provides comparable overall survival in patients with a single small HCC without portal hypertension or a raised bilirubin level.
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Affiliation(s)
- G-A Kim
- Department of Gastroenterology, Asan Liver Centre, Seoul, Korea
- Health Screening and Promotion Centre, Seoul, Korea
| | - J H Shim
- Department of Gastroenterology, Asan Liver Centre, Seoul, Korea
| | - M-J Kim
- Department of Clinical Epidemiology and Biostatistics, Asan Medical Centre, University of Ulsan College of Medicine, Seoul, Korea
| | - S Y Kim
- Department of Radiology, Asan Liver Centre, Seoul, Korea
| | - H J Won
- Department of Radiology, Asan Liver Centre, Seoul, Korea
| | - Y M Shin
- Department of Radiology, Asan Liver Centre, Seoul, Korea
| | - P N Kim
- Department of Radiology, Asan Liver Centre, Seoul, Korea
| | - K-H Kim
- Department of Surgery, Asan Liver Centre, Seoul, Korea
| | - S-G Lee
- Department of Surgery, Asan Liver Centre, Seoul, Korea
| | - H C Lee
- Department of Gastroenterology, Asan Liver Centre, Seoul, Korea
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Jeon JS, Kim BH, Lee SH, Kwon HJ, Bae HJ, Kim SK, Park JA, Shim JH, Abd El-Aty AM, Shin HC. Simultaneous determination of arbutin and its decomposed product hydroquinone in whitening creams using high-performance liquid chromatography with photodiode array detection: Effect of temperature and pH on decomposition. Int J Cosmet Sci 2015; 37:567-73. [PMID: 25857400 DOI: 10.1111/ics.12228] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Accepted: 03/31/2015] [Indexed: 11/26/2022]
Abstract
OBJECTIVE Arbutin is an effective agent for the treatment of melanin disorders. Arbutin may be converted to hydroquinone under conditions of high temperature, ultraviolet (UV) radiation and dilute acid. The aim of the current study was to develop an analytical method to determine the levels of arbutin and hydroquinone in whitening cosmetic products using high-performance liquid chromatography with photodiode array detection (HPLC-DAD). In addition, we investigated the effects of high temperature and pH on the decomposition of arbutin. METHODS Samples extracted using two-step sonications were separated on a C18 column using a gradient mobile phase consisting of water and methanol. A 60-mm (40 μL) DAD cell was used to enhance the sensitivity of hydroquinone determination. Thermal decomposition of arbutin was evaluated at temperatures ranging from 60 to 120°C for 1-36 h. RESULTS The method showed good linearity (R(2) ≥ 0.9997), precision (relative standard deviation, RSD < 5%) and acceptable extraction recovery (90-102.6%). The limits of quantitation for arbutin and hydroquinone were 0.0085 and 0.0119 μg mL(-1) , respectively. One sample of 21 cosmetic products tested contained arbutin at a concentration 1.61 g 100 g(-1) cream and 0.12 g 100 g(-1) cream of hydroquinone. Arbutin (327.18 ppm) decomposed after 6 h at 120°C and produced 10.73 ppm of hydroquinone. CONCLUSION The developed method is simple to detect both arbutin and hydroquinone simultaneously in cosmetic products, at an adequate level of sensitivity. Notably, temperature and pH did not influence the decomposition of arbutin to hydroquinone in a 2% arbutin cream.
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Affiliation(s)
- J S Jeon
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, Konkuk University, Nuengdong-ro, Gwangjin-gu, Seoul, 143-701, Korea.,Public Health Research Division, Gyeonggi Province Institute of Health and Environment, 95, Pajang cheon-ro, Jangan-gu, Suwonsi, Gyeonggi Province, 440-290, Korea
| | - B H Kim
- Public Health Research Division, Gyeonggi Province Institute of Health and Environment, 95, Pajang cheon-ro, Jangan-gu, Suwonsi, Gyeonggi Province, 440-290, Korea
| | - S H Lee
- Public Health Research Division, Gyeonggi Province Institute of Health and Environment, 95, Pajang cheon-ro, Jangan-gu, Suwonsi, Gyeonggi Province, 440-290, Korea
| | - H J Kwon
- Public Health Research Division, Gyeonggi Province Institute of Health and Environment, 95, Pajang cheon-ro, Jangan-gu, Suwonsi, Gyeonggi Province, 440-290, Korea
| | - H J Bae
- Public Health Research Division, Gyeonggi Province Institute of Health and Environment, 95, Pajang cheon-ro, Jangan-gu, Suwonsi, Gyeonggi Province, 440-290, Korea
| | - S K Kim
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, Konkuk University, Nuengdong-ro, Gwangjin-gu, Seoul, 143-701, Korea
| | - J A Park
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, Konkuk University, Nuengdong-ro, Gwangjin-gu, Seoul, 143-701, Korea
| | - J H Shim
- Biotechnology Research Institute, College of Agriculture and Life Sciences, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju, 500-757, Korea
| | - A M Abd El-Aty
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, Konkuk University, Nuengdong-ro, Gwangjin-gu, Seoul, 143-701, Korea.,Department of Pharmacology, Faculty of Veterinary Medicine, Cairo University, Giza, 12211, Egypt
| | - H C Shin
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, Konkuk University, Nuengdong-ro, Gwangjin-gu, Seoul, 143-701, Korea
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Shim JH, Song KY, Kim HH, Han SU, Kim MC, Hyung WJ, Kim W, Lee HJ, Ryu SW, Cho GS, Ryu SY. Signet ring cell histology is not an independent predictor of poor prognosis after curative resection for gastric cancer: a propensity analysis by the KLASS Group. Medicine (Baltimore) 2014; 93:e136. [PMID: 25501051 PMCID: PMC4602776 DOI: 10.1097/md.0000000000000136] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Whether signet ring cell (SRC) histology carries a worse prognosis than other forms of gastric adenocarcinoma has been questioned. The present study investigated the differences in clinicopathologic features and survival between SRC and non-SRC adenocarcinoma. The prospectively collected data of 2643 patients who had undergone curative gastrectomy between 1998 and 2005 by 10 surgeons were reviewed. Additionally, we employed analysis of covariance, propensity-score risk adjustment, and propensity-based matching to account for possible selection bias. The baseline characteristics of prematched patients with SRC or non-SRC adenocarcinoma histology differed: SRC presented in younger patients and less often in men, was more likely found in the middle stomach, and was more likely to be Stage I. After applying the propensity-score strata and propensity-score matching, there was no difference in the baseline characteristics, and SRC was not an independent risk factor for mortality in the same stage. SRC is not an independent predictor of poor prognosis after curative resection for gastric cancer in Korea.
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Affiliation(s)
- Jung Ho Shim
- From the Department of Surgery (JHS, KYS, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul; Department of Surgery (H-HK), Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea; Department of Surgery (S-UH), Ajou University School of Medicine, Suwon; Department of Surgery (M-CK), Dong-A University College of Medicine, Busan; Department of Surgery (WJH), Institute of Gastroenterology, Yonsei University College of Medicine; Department of Surgery (WK), Yeouido St. Mary's Hospital, College of Medicine, The Catholic University of Korea; Department of Surgery (H-JL), Cancer Research Institute, Seoul National University College of Medicine, Seoul; Department of Surgery (SWR), Keimyung University School of Medicine, Daegu; Department of Surgery (GSC), Soonchunhyang University Bucheon Hospital, Soonchunhyang University College of Medicine, Bucheon; and Department of Surgery (SYR), Chonnam National University Medical School, Gwangju, Korea
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Seo HS, Shim JH, Jeon HM, Park CH, Song KY. Postoperative pancreatic fistula after robot distal gastrectomy. J Surg Res 2014; 194:361-366. [PMID: 25454974 DOI: 10.1016/j.jss.2014.10.022] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Revised: 09/09/2014] [Accepted: 10/17/2014] [Indexed: 10/24/2022]
Abstract
BACKGROUND To compare the incidences of postoperative pancreatic fistula (POPF) between robot-assisted distal gastrectomy (RADG) and laparoscopy-assisted distal gastrectomy (LADG). MATERIALS AND METHODS A total of 40 patients with gastric cancer who underwent RADG were compared with 40 initial patients who underwent LADG by a single surgeon. We evaluated and compared the clinicopathologic characteristics, surgical outcomes, and operative complications including POPF in two groups. RESULTS The POPF was observed more frequently in the LADG group than in the RADG group (22.5% versus 10%, P < 0.001). Although the serum amylase levels in the 20 first-half cases did not statistically differ between LADG and RADG (P = 0.32), those in the 20 latter-half cases were significantly lower in the RADG group (P < 0.05). Univariate and multivariate analyses identified laparoscopic surgery and visceral fat area as POPF-associated risk factors. CONCLUSIONS RADG is feasible and safe for distal gastrectomy in terms of POPF.
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Affiliation(s)
- Ho Seok Seo
- Division of Gastrointestinal Surgery, Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Jung Ho Shim
- Division of Gastrointestinal Surgery, Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Hae Myung Jeon
- Division of Gastrointestinal Surgery, Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Cho Hyun Park
- Division of Gastrointestinal Surgery, Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Kyo Young Song
- Division of Gastrointestinal Surgery, Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
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Shim JH, Yoon JH, Choi SS, Ashktorab H, Smoot DT, Song KY, Nam SW, Lee JY, Park CH, Park WS. The effect of Helicobacter pylori CagA on the HER-2 copy number and expression in gastric cancer. Gene 2014; 546:288-96. [PMID: 24879917 DOI: 10.1016/j.gene.2014.05.064] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Revised: 04/15/2014] [Accepted: 05/23/2014] [Indexed: 01/26/2023]
Abstract
We investigated whether Helicobacter pylori (H. pylori) CagA contributes to the DNA copy change and mRNA transcript expression of the HER-2 gene and, consequently, affects HER-2 protein expression to evaluate the significance of CagA and HER-2 amplification in gastric cancer. We used the AGS and MKN1 gastric cancer and HFE-145 immortalized non-neoplastic gastric mucosa cell lines. We also confirmed the effects of CagA on HER-2 expression in human gastric cancer tissues and gastric mucosal tissues of H. pylori infected C57BL/6 mice. Ectopic CagA expression in AGS, MKN1 and HFE-145 cells showed a significant increase in HER-2 gene copy number and expression. The gastric mucosae of H. pylori infected C57BL/6 mice also showed increased HER-2 DNA copy number and protein expression. In addition, CagA expression was detected in 17 (56.7%) of 30 gastric cancer tissues, and eight (47%) of them showed HER-2 DNA amplification of more than two-fold. In immunohistochemistry, HER-2 overexpression was detected in 12 (40%) of 30 gastric cancers and a positive correlation was observed among DNA copy number, the mRNA transcript, and protein expression of the HER-2 gene in gastric cancer (P<0.05). These results suggest that H. pylori CagA may induce overexpression of the HER-2 protein by increasing HER-2 DNA and mRNA copy number.
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Affiliation(s)
- Jung Ho Shim
- Division of Gastrointestinal Surgery, Department of Surgery, College of Medicine, The Catholic University of Korea, Seoul, South Korea
| | - Jung Hwan Yoon
- Department of Pathology, College of Medicine, The Catholic University of Korea, Seoul, South Korea
| | - Sung Sook Choi
- College of Pharmacy, Sahmyook University, Hwarangro 815, Nowon-gu, Seoul 139-742, South Korea
| | - Hassan Ashktorab
- Department of Medicine, Howard University, Washington, DC 20060, USA
| | - Duane T Smoot
- Department of Medicine, Howard University, Washington, DC 20060, USA
| | - Kyo Young Song
- Division of Gastrointestinal Surgery, Department of Surgery, College of Medicine, The Catholic University of Korea, Seoul, South Korea
| | - Suk Woo Nam
- Department of Pathology, College of Medicine, The Catholic University of Korea, Seoul, South Korea
| | - Jung Young Lee
- Department of Pathology, College of Medicine, The Catholic University of Korea, Seoul, South Korea
| | - Cho Hyun Park
- Division of Gastrointestinal Surgery, Department of Surgery, College of Medicine, The Catholic University of Korea, Seoul, South Korea
| | - Won Sang Park
- Department of Pathology, College of Medicine, The Catholic University of Korea, Seoul, South Korea.
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Shim JH, Song KY, Jeon HM, Park CH, Jacks LM, Gonen M, Shah MA, Brennan MF, Coit DG, Strong VE. Is gastric cancer different in Korea and the United States? Impact of tumor location on prognosis. Ann Surg Oncol 2014; 21:2332-9. [PMID: 24599411 DOI: 10.1245/s10434-014-3608-7] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2013] [Indexed: 12/15/2022]
Abstract
PURPOSE To compare the characteristics and prognoses of gastric cancers by tumor location in Korean and U.S. subjects after curative-intent (R0) resection for gastric cancer (GC). METHODS Data were collected for all patients who had undergone R0 resection at one U.S. institution (n = 567) and one South Korean institution (n = 1,620). Patients with gastroesophageal junction tumors or neoadjuvant therapy were excluded. Patient, surgical, and pathologic variables were compared by tumor location. Factors associated with disease-specific survival (DSS) were determined via multivariate analysis. RESULTS In the Korean cohort, significantly more upper third GC (UTG) patients had undifferentiated, diffuse type, and advanced stage cancers compared to lower third GC (LTG) and middle third GC (MTG) patients. In the U.S. cohort, however, T stage was relatively evenly distributed among UTG, MTG, and LTG patients. The independent predictors of DSS in the Korean cohort were T stage, tumor size, retrieved and positive lymph node counts, and age, but in the U.S. cohort, the only independent predictors were T stage and positive lymph node count. Tumor size significantly affected DSS of Korean UTG patients but not U.S. UTG patients. CONCLUSIONS There were significant differences in tumor characteristics by tumor location within and between both national cohorts. On the basis of these findings, further study to investigate the biological difference between the two countries is needed.
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Affiliation(s)
- Jung Ho Shim
- Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, South Korea
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Shim JH. The effects of H. pylori CagA on DNA amplification and protein expression status of the HER2 gene in gastric cancer. J Clin Oncol 2014. [DOI: 10.1200/jco.2014.32.3_suppl.67] [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: 11/20/2022] Open
Abstract
67 Background: We investigated whether Cag A contributes to the DNA copy change and expression of the HER2 gene mRNA transcript and, consequently, affects HER2 protein expression to evaluate the significance of H. pylori Cag A and HER2 amplification in gastric cancer. Methods: We used the AGS gastric cancer and HFE-145 immortalized non-neoplastic gastric mucosa cell lines to investigate whether Cag A regulates DNA copy number and HER2 expression. We also confirmed the effects of Cag A on gastric cancer tissues. Immunohistochemistry with or without fluorescence in situ hybridization (FISH) was conducted to determine the level of HER2 protein expression based on the revised criteria in the HER2 test guidelines. Results: H. pylori CagA transfected AGS cells showed a significant increase in HER2 gene copy number and expression. In addition, Cag A expression was detected in 17 (56.7%) of 30 gastric cancer (GC) tissues, and eight (47%) showed HER2 DNA amplification of more than two-fold (P = 0.013). A positive correlation was observed among DNA copy number, the mRNA transcript, and HER2 gene protein expression (p < 0.05). HER2 overexpression was detected in 12 (40%) of 30 gastric cancers by Hoffman’s criteria. Conclusions: These results suggest that H. pylori CagA may induce overexpression of the HER2 gene protein by increasing HER2 DNA and mRNA copy number. To overcome the weakness of the current HER2 assessment criteria, we propose to test HER2 DNA copy number changes with immunohistochemistry, instead of FISH.
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Affiliation(s)
- Jung Ho Shim
- Division of Gastrointestinal Surgery, Samsung Medical Center, Seoul, South Korea
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Choi SH, Shim JH, Park CH, Song KY. Low molecular-weight heparin for thromboprophylaxis in patients undergoing gastric cancer surgery: an experience from one Korean institute. Ann Surg Treat Res 2014; 86:22-7. [PMID: 24761403 PMCID: PMC3994607 DOI: 10.4174/astr.2014.86.1.22] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2013] [Revised: 10/13/2013] [Accepted: 10/24/2013] [Indexed: 02/02/2023] Open
Abstract
Purpose This study evaluated the efficacy for preventing venous thromboembolism (VTE) and adverse effects of low-molecular-weight heparin (LMWH) in order to launch a prospective clinical trial in Korea. Methods We reviewed the medical records of 108 consecutive patients who underwent gastric cancer surgery. These patients were divided into 2 groups according to the type of thromboprophylaxis: group A, LMWH combined with intermittent pneumatic compression (IPC); group B, IPC alone. The postoperative outcomes of the two groups were compared. Results Symptomatic VTE was observed in only 1 patient (0.9%) from group B. Postoperative bleeding was more common in group A than in group B (10.9% vs. 7.5%), although the difference was not significant (P = 0.055). Most bleeding episodes were minor and managed conservatively without intervention. Only a high body mass index was associated with a significantly increased risk of postoperative bleeding (odds ratio, 1.45; 95% confidence interval, 1.12-2.43; P = 0.051). Conclusion A 40 mg of enoxaparin sodium is a safe and feasible dose for prevention of VTE. With the results of this study, we are planning a prospective randomized clinical trial to investigate the clinical efficacy of LMWH thromboprophylaxis in gastric cancer patients in Korea.
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Affiliation(s)
- Sung Ho Choi
- Division of Gastrointestinal Surgery, Department of Surgery, The Catholic University of Korea School of Medicine, Seoul, Korea
| | - Jung Ho Shim
- Division of Gastrointestinal Surgery, Department of Surgery, The Catholic University of Korea School of Medicine, Seoul, Korea
| | - Cho Hyun Park
- Division of Gastrointestinal Surgery, Department of Surgery, The Catholic University of Korea School of Medicine, Seoul, Korea
| | - Kyo Young Song
- Division of Gastrointestinal Surgery, Department of Surgery, The Catholic University of Korea School of Medicine, Seoul, Korea
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Yi HW, Kim SM, Kim SH, Shim JH, Choi MG, Lee JH, Noh JH, Sohn TS, Bae JM, Kim S. Complications leading reoperation after gastrectomy in patients with gastric cancer: frequency, type, and potential causes. J Gastric Cancer 2013; 13:242-6. [PMID: 24511420 PMCID: PMC3915186 DOI: 10.5230/jgc.2013.13.4.242] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/23/2013] [Revised: 10/24/2013] [Accepted: 11/13/2013] [Indexed: 12/22/2022] Open
Abstract
Purpose Reoperations after gastrectomy for gastric cancer are performed for many types of complications. Unexpected reoperations may cause mental, physical, and financial problems for patients. The aim of the present study was to evaluate the causes of reoperations and to develop a strategic decision-making process for these reoperations. Materials and Methods From September 2002 through August 2010, 6,131 patients underwent open conventional gastrectomy operations at Samsung Medical Center. Of these, 129 patients (2.1%) required reoperation because of postoperative complications. We performed a retrospective analysis of the patients using an electronic medical record review. Statistical data were analyzed to compare age, sex, stage, type of gastrectomy, length of operation, size of tumor, and number of lymph node metastasis between patients who had been operated and those who had not. Results The variables of age, sex, tumor stage, type of gastrectomy, length of operation, and number of lymph node metastases did not differ between the 2 groups. However, the mean tumor size in the reoperation group was greater than that in the non-reoperation group (5.0±3.7 [standard deviation] versus 4.1±2.9, P=0.007). The leading cause of reoperation was surgical-site infection (n=49, 0.79%). Patients with intra-abdominal bleeding were operated on again in the shortest period after the initial gastrectomy (6.3±4.2 days). Patients with incisional hernia were not reoperated on until after 208.3±81.0 days, the longest postoperative period. Conclusions Tumor size was the major variable leading to reoperation after gastrectomy for gastric cancer. The most common complication requiring the reoperation was a surgical site-related complication.
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Affiliation(s)
- Ha Woo Yi
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Su Mi Kim
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Sang Hyun Kim
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Jung Ho Shim
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Min Gew Choi
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Jun Ho Lee
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Jae Hyung Noh
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Tae Sung Sohn
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Jae Moon Bae
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Sung Kim
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
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Zhao LB, Shi HB, Park S, Lee DG, Shim JH, Lee DH, Suh DC. Acute bleeding in the head and neck: angiographic findings and endovascular management. AJNR Am J Neuroradiol 2013; 35:360-6. [PMID: 24136646 DOI: 10.3174/ajnr.a3761] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND AND PURPOSE Life-threatening bleeding in the head and neck requires urgent management. This study evaluated the angiographic findings related to head and neck bleeding and presents endovascular management techniques. MATERIAL AND METHODS Sixty-one consecutive patients who presented with acute bleeding in the head and neck areas and subsequently underwent endovascular therapy between January 2002 and October 2012 were included in our study. We evaluated the angiographic findings, techniques, and results of endovascular management. RESULTS Contrast leakage (n = 10), pseudoaneurysm (n = 20), or both (n = 10) were the most common life-threatening angiographic findings (66%) and were the foci of immediate embolization or endoluminal vessel reconstruction. Seventeen patients (28%) had hypervascular staining of the tumor or mucosa, and 4 patients (6%) did not have any abnormal findings. The acute bleeding was successfully controlled by endovascular management according to the bleeding foci. Carotid arterial lesions, so-called "carotid blowout," required reconstructive or deconstructive therapy. Bleeding of the external carotid artery required specific branch embolization by a combination of various embolic materials. No procedure-related complications occurred except in 1 patient who experienced acute infarction caused by thromboemboli from the covered stent. Seventeen patients (28%) were retreated due to rebleeding after the mean 20-month follow-up. CONCLUSIONS Contrast leakage or a pseudoaneurysm or both seen on angiography are active bleeding foci and targets for therapy in patients with acute bleeding in the head and neck area. Despite different bleeding-control strategies according to vessel involvement, endovascular treatment is safe and effective for controlling hemorrhage.
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Affiliation(s)
- L-B Zhao
- From the Departments of Radiology and Research Institute of Radiology (L.-B.Z., H.B.S., S.P., D.-g.L., J.H.S., D.H.L., D.C.S.), University of Ulsan, College of Medicine, Asan Medical Center, Seoul, Korea
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15
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Kwak JH, Zhao L, Kim JK, Park S, Lee DG, Shim JH, Lee DH, Kim JS, Suh DC. The outcome and efficacy of recanalization in patients with acute internal carotid artery occlusion. AJNR Am J Neuroradiol 2013; 35:747-53. [PMID: 24091441 DOI: 10.3174/ajnr.a3747] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
BACKGROUND AND PURPOSE Acute occlusion of the ICA is often associated with poor outcomes and severe neurologic deficits. This study was conducted to evaluate outcome of the occluded ICA and efficacy of recanalization under protective flow arrest. MATERIALS AND METHODS Fifty consecutive patients who underwent endovascular treatment for acute ICA occlusion were identified from the prospectively collected data base. We assessed NIHSSo, occlusion type (cardioembolism vs atherosclerosis), occlusion level (supraclinoid-terminal, petrocavernous, or bulb-cervical), recanalization degree (TICI), and efficacy of recanalization (protective flow arrest vs nonprotection) leading to better outcome. RESULTS Successful recanalization (TICI ≥ 2) was obtained in 90% of patients and good recovery (mRS ≤ 2) in 60% of patients. Good outcome was related to National Institutes of Health Stroke Scale score on admission (P < .001), TICI (P < .007), occlusion type (P = .022), and occlusion level (P = .038). Poor initial patient status, less recanalization, cardioembolism, and supraclinoid-terminal occlusion were associated with poor prognosis. Application of protective flow arrest led to better outcome in the distal ICA segment than in the bulb-cervical segment. CONCLUSIONS In addition to the initial patient status and successful recanalization, the occlusion level or type of the occluded ICA could affect clinical outcome. In this study, treatment benefits of protective flow arrest were accentuated in patients with ICA occlusion above the bulb-cervical segment.
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Affiliation(s)
- J H Kwak
- From the Department of Radiology and Research Institute of Radiology (J.H.K., L.Z., S.P., D.-g.L., J.H.S., D.H.L., D.C.S.)
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Abstract
We retrospectively studied the radiological and clinical results of a simple hemiresection arthroplasty, a modification of previous oblique distal ulnar resections, in 62 patients with rheumatoid arthritis (68 wrists) over a mean follow-up of 103 (range 60-173) months. Fourteen wrists (20%) became fused at the radiocarpal joint and 28 wrists fused (41%) at the midcarpal joints during follow-up. Severe ulnar translocation of the carpus was observed in two wrists (3%), radio-ulnar convergence in five wrists (7%), as well as a significant decrease of carpal height ratio, without any radiological findings of stylocarpal impingement. Improvements in forearm pronation and supination, and reduction in pain were maintained at the last follow-up. Grip strength was not significantly improved. The Jebsen-Taylor hand function test showed improvements in writing, card turning, and simulated feeding. Fifty-two patients (58 wrists, 85%) were satisfied with the results at the last follow-up. Simple hemiresection arthroplasty showed good long-term results with few complications.
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Affiliation(s)
- C H Lee
- Department of Orthopaedic Surgery, Hanil General Hospital, Seoul, Korea
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Lee NJ, Oh JH, Ban JO, Shim JH, Lee HP, Jung JK, Ahn BW, Yoon DY, Han SB, Ham YW, Hong JT. 4-O-methylhonokiol, a PPARγ agonist, inhibits prostate tumour growth: p21-mediated suppression of NF-κB activity. Br J Pharmacol 2013; 168:1133-45. [PMID: 23043610 DOI: 10.1111/j.1476-5381.2012.02235.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2012] [Revised: 08/22/2012] [Accepted: 09/05/2012] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND AND PURPOSE The effects of 4-O-methylhonokiol (MH), a constituent of Magnolia officinalis, were investigated on human prostate cancer cells and its mechanism of action elucidated. EXPERIMENTAL APPROACH The anti-cancer effects of MH were examined in prostate cancer and normal cells. The effects were validated in vivo using a mouse xenograft model. KEY RESULTS MH increased the expression of PPARγ in prostate PC-3 and LNCap cells. The pull-down assay and molecular docking study indicated that MH directly binds to PPARγ. MH also increased transcriptional activity of PPARγ but decreased NF-κB activity. MH inhibited the growth of human prostate cancer cells, an effect attenuated by the PPARγ antagonist GW9662. MH induced apoptotic cell death and this was related to G(0) -G(1) phase cell cycle arrest. MH increased the expression of the cell cycle regulator p21, and apoptotic proteins, whereas it decreased phosphorylation of Rb and anti-apoptotic proteins. Transfection of PC3 cells with p21 siRNA or a p21 mutant plasmid on the cyclin D1/ cycline-dependent kinase 4 binding site abolished the effects of MH on cell growth, cell viability and related protein expression. In the animal studies, MH inhibited tumour growth, NF-κB activity and expression of anti-apoptotic proteins, whereas it increased the transcriptional activity and expression of PPARγ, and the expression of apoptotic proteins and p21 in tumour tissues. CONCLUSIONS AND IMPLICATION MH inhibits growth of human prostate cancer cells through activation of PPARγ, suppression of NF-κB and arrest of the cell cycle. Thus, MH might be a useful tool for treatment of prostate cancer.
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Affiliation(s)
- N J Lee
- College of Pharmacy, Chungbuk National University, Chungbuk, South Korea
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Park S, Lee DG, Shim JH, Lee DH, Suh DC. Recanalization of symptomatic vertebral ostial occlusion in patients with acute or subacute stroke. AJNR Am J Neuroradiol 2013; 35:367-72. [PMID: 23907242 DOI: 10.3174/ajnr.a3681] [Citation(s) in RCA: 6] [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: 11/07/2022]
Abstract
SUMMARY Vertebral artery recanalization in symptomatic stenosis/occlusion remains controversial, as no definite evidence exists regarding this topic. There are only a few reports regarding the feasibility and safety of recanalization in the first segment of the vertebral artery with atherosclerotic vertebral ostial occlusion. We report our experience treating first segment occlusion in 8 patients and present a balloon protection technique used to reduce the thromboembolic burden during the stent placement procedure. The outcome at 3 months showed an mRS ≤2 except for a patient with a poor initial status with basilar artery occlusion. Revascularization of a rather long first segment occlusion is technically feasible and can be safely performed by use of embolic protection methods.
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Affiliation(s)
- S Park
- From the Department of Radiology and Research Institute of Radiology (S.P., D.-G.L., J.H.S., D.H.L., D.C.S.), University of Ulsan, College of Medicine, Asan Medical Center, Seoul, Korea
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20
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Jeong DW, Choi HC, Kim CH, Chang SH, Sohn CH, Park HJ, Kang TD, Cho DY, Baek SH, Eom CB, Shim JH, Yu J, Kim KW, Moon SJ, Noh TW. Temperature evolution of itinerant ferromagnetism in SrRuO3 probed by optical spectroscopy. Phys Rev Lett 2013; 110:247202. [PMID: 25165956 DOI: 10.1103/physrevlett.110.247202] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Indexed: 06/03/2023]
Abstract
The temperature (T) dependence of the optical conductivity spectra σ(ω) of a single crystal SrRuO(3) thin film is studied over a T range from 5 to 450 K. We observed significant T dependence of the spectral weights of the charge transfer and interband d-d transitions across the ferromagnetic Curie temperature (T(c) ∼ 150 K). Such T dependence was attributed to the increase in the Ru spin moment, which is consistent with the results of density functional theory calculations. T scans of σ(Ω,T) at fixed frequencies Ω reveal a clear T(2) dependence below T(c), demonstrating that the Stoner mechanism is involved in the evolution of the electronic structure. In addition, σ(Ω,T) continues to evolve at temperatures above T(c), indicating that the local spin moment persists in the paramagnetic state. This suggests that SrRuO(3) is an intriguing oxide system with itinerant ferromagnetism.
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Affiliation(s)
- D W Jeong
- Center for Functional Interfaces of Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-747, Korea and Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea
| | - Hong Chul Choi
- Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - Choong H Kim
- Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea
| | - Seo Hyoung Chang
- Center for Functional Interfaces of Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-747, Korea and Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea
| | - C H Sohn
- Center for Functional Interfaces of Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-747, Korea and Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea
| | - H J Park
- Center for Functional Interfaces of Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-747, Korea and Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea
| | - T D Kang
- Center for Functional Interfaces of Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-747, Korea and Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea
| | - Deok-Yong Cho
- Center for Functional Interfaces of Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-747, Korea and Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea
| | - S H Baek
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - C B Eom
- Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - J H Shim
- Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, Korea and Division of Advanced Nuclear Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - J Yu
- Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea
| | - K W Kim
- Department of Physics, Chungbuk National University, Cheongju 361-763, Korea
| | - S J Moon
- Department of Physics, Hanyang University, Seoul 133-791, Korea
| | - T W Noh
- Center for Functional Interfaces of Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-747, Korea and Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea
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Neumann P, Jakobi I, Dolde F, Burk C, Reuter R, Waldherr G, Honert J, Wolf T, Brunner A, Shim JH. High-precision nanoscale temperature sensing using single defects in diamond. Nano Lett 2013; 13:2738-42. [PMID: 23721106 DOI: 10.1021/nl401216y] [Citation(s) in RCA: 216] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Measuring local temperature with a spatial resolution on the order of a few nanometers has a wide range of applications in the semiconductor industry and in material and life sciences. For example, probing temperature on the nanoscale with high precision can potentially be used to detect small, local temperature changes like those caused by chemical reactions or biochemical processes. However, precise nanoscale temperature measurements have not been realized so far owing to the lack of adequate probes. Here we experimentally demonstrate a novel nanoscale temperature sensing technique based on optically detected electron spin resonance in single atomic defects in diamonds. These diamond sensor sizes range from a micrometer down to a few tens of nanometers. We achieve a temperature noise floor of 5 mK/Hz(1/2) for single defects in bulk sensors. Using doped nanodiamonds as sensors the temperature noise floor is 130 mK/Hz(1/2) and accuracies down to 1 mK for nanocrystal sizes and therefore length scales of a few tens of nanometers. This combination of precision and position resolution, combined with the outstanding sensor photostability, should allow the measurement of the heat produced by chemical interactions involving a few or single molecules even in heterogeneous environments like cells.
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Affiliation(s)
- P Neumann
- 3rd Physikalisches Institut, Research Center Scope and IQST, University of Stuttgart, 70569 Stuttgart, Germany.
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Shim JH, Park CH, Song KY. Re: Overweight patients achieve ideal body weight following curative gastrectomy resulting in better long-term prognosis. Obes Surg 2013; 23:974-5. [PMID: 23733399 DOI: 10.1007/s11695-013-0945-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Shim JH, Kim JG, Jeon HM, Park CH, Song KY. The Robotic Third Arm as a Competent Analog of an Assisting Surgeon in Radical Gastrectomy: Impact on Short-Term Clinical Outcomes. J Laparoendosc Adv Surg Tech A 2013; 23:447-51. [DOI: 10.1089/lap.2012.0423] [Citation(s) in RCA: 3] [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: 01/28/2023] Open
Affiliation(s)
- Jung Ho Shim
- Division of Gastrointestinal Surgery, Department of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Jun Gi Kim
- Minimal Access and Robotic Surgery Center, Seoul St. Mary's Hospital, Seoul, Korea
| | - Hae Myung Jeon
- Division of Gastrointestinal Surgery, Department of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Cho Hyun Park
- Division of Gastrointestinal Surgery, Department of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Kyo Young Song
- Division of Gastrointestinal Surgery, Department of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea
- Minimal Access and Robotic Surgery Center, Seoul St. Mary's Hospital, Seoul, Korea
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Yoo HM, Gweon TG, Seo HS, Shim JH, Oh SI, Choi MG, Song KY, Jeon HM, Park CH. Role of preoperative colonoscopy in patients with gastric cancer: a case control study of the prevalence of coexisting colorectal neoplasms. Ann Surg Oncol 2013; 20:1614-22. [PMID: 23361895 DOI: 10.1245/s10434-012-2737-0] [Citation(s) in RCA: 16] [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] [Received: 09/02/2012] [Indexed: 12/14/2022]
Abstract
BACKGROUND We evaluated the prevalence of coexisting asymptomatic colorectal neoplasm (CRN) in patients with gastric cancer (GC). METHODS Preoperative colonoscopic examinations were performed in 495 patients with GC who underwent gastrectomy between January 2009 and December 2010. To compare the prevalence of CRN in these patients with that in a normal population, we selected 495 sex- and age-matched persons who underwent colonoscopies for health screening. Risk factors for CRN were evaluated by univariate and multivariate analyses. RESULTS The overall incidence of CRN was 41.8 % (414/990). The prevalence of overall CRN, high-risk CRN, and colorectal carcinoma (CRC) were significantly higher in the GC group than in the control group (overall CRN: 48.9 % vs. 34.7 %; high-risk CRN: 28.3 % vs. 13.5 %; CRC: 2.6 % vs. 0.2 %; all P < 0.001). The presence of GC [odds ratio (OR), 1.82; 95 % confidence interval (CI), 1.4-2.38; P < 0.001], age ≥50 years (OR, 2.58; 95 % CI, 1.75-3.81; P < 0.001), and male sex (OR, 2.28; 95 % CI, 1.72-3.02; P < 0.001) were risk factors for overall CRN. In patients with GC, age ≥40 years (OR, 3.22; 95 % CI, 1.24-8.37; P = 0.016) and male sex (OR, 3.21; 95 % CI, 2.17-4.76; P < 0.001) were risk factors for overall CRN. CONCLUSIONS The prevalence of coexisting CRN, including CRC, was higher in patients with GC than in the normal population. Preoperative colonoscopy is strongly indicated in patients with GC who are male and/or ≥40 years of age.
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Affiliation(s)
- Han Mo Yoo
- Division of Gastrointestinal Surgery, Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
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Shim JH, Park CH, Song KY. Long-term comparison of laparoscopy-assisted distal gastrectomy and open distal gastrectomy in advanced gastric cancer. Surg Endosc 2013; 27:2650-1. [DOI: 10.1007/s00464-013-2784-z] [Citation(s) in RCA: 3] [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] [Received: 09/16/2012] [Accepted: 10/20/2012] [Indexed: 11/29/2022]
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Shim JH, O JH, Oh SI, Yoo HM, Jeon HM, Park CH, Kim SH, Song KY. Clinical significance of incidental colonic 18F-FDG uptake on PET/CT images in patients with gastric adenocarcinoma. J Gastrointest Surg 2012; 16:1847-53. [PMID: 22752472 DOI: 10.1007/s11605-012-1941-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2012] [Accepted: 06/15/2012] [Indexed: 01/31/2023]
Abstract
BACKGROUND AND OBJECTIVES We assessed the ability of positron emission tomography-computed tomography (PET/CT) to detect synchronous colonic pathology and determined the significance of 18F-fluorodeoxyglucose (18F-FDG) activity in the colon of gastric cancer patients. METHODS A total of 239 gastric cancer patients who underwent PET/CT and colonoscopy preoperatively were included. FDG uptake patterns on PET/CT were classified as (1) group A, focal; (2) group B, diffuse; and (3) group C, no uptake. The PET/CT findings were compared with the results of concurrent colonoscopy. RESULTS In group A, a total of 123 polyps of >0 mm were observed. Of these, nine polyps were colonic adenocarcinomas and six were high-grade dysplasia. The incidence of colonic adenocarcinomas was significantly higher in group A than in the other two groups (p = 0.037). There was a significant correlation between SUVmax values and incidence of colonic polyps of >10 mm (r = 0.471, p = 0.04). The distribution pattern of SUVmax in polyps with adenoma (>10 mm) was less homogenous than in polyps (>10 mm) with adenocarcinoma. CONCLUSIONS The focal colonic FDG uptake in PET/CT requires colonoscopic confirmation. The suspicion of colonic malignancy increased in the presence of polyps >10 mm that showed a positive correlation with the SUVmax.
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Affiliation(s)
- Jung Ho Shim
- Division of Gastrointestinal Surgery, Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, 505 Banpo-dong, Seocho-gu, Seoul, 137-701, South Korea
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O SI, Shim JH, Song KY. Re: Participation and conflict in the decision-making process for endoscopic resection or surgical gastrectomy for early gastric cancer. J Surg Oncol 2012; 106:524. [PMID: 22487957 DOI: 10.1002/jso.23086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2012] [Accepted: 02/06/2012] [Indexed: 11/08/2022]
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O SI, Shim JH, Song KY. Re: the decision criterion of histological mixed type in "T1/T2" gastric carcinoma-comparison between TNM classification and Japanese classification of gastric cancer. J Surg Oncol 2012; 106:354; author reply 355. [PMID: 22331831 DOI: 10.1002/jso.23065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Accepted: 01/21/2012] [Indexed: 11/08/2022]
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Shim JH, Bertaina S, Gambarelli S, Mitra T, Müller A, Baibekov EI, Malkin BZ, Tsukerblat B, Barbara B. Decoherence window and electron-nuclear cross relaxation in the molecular magnet V15. Phys Rev Lett 2012; 109:050401. [PMID: 23006148 DOI: 10.1103/physrevlett.109.050401] [Citation(s) in RCA: 11] [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] [Received: 08/18/2011] [Indexed: 06/01/2023]
Abstract
Rabi oscillations in the V(15) single molecule magnet embedded in the surfactant (CH(3))(2)[CH(3)(CH(2))(16)CH(2)](2)N(+) have been studied at different microwave powers. An intense damping peak is observed when the Rabi frequency Ω(R) falls in the vicinity of the Larmor frequency of protons ω(N). The experiments are interpreted by a model showing that the damping (or Rabi) time τ(R) is directly associated with decoherence caused by electron-nuclear cross relaxation in the rotating reference frame. This decoherence induces energy dissipation in the range ω(N) - σ(e) < Ω(R) < ω(N), where σ(e) is the mean superhyperfine field induced by protons at V(15). Weaker decoherence without dissipation takes place outside this window. Specific estimations suggest that this rapid cross relaxation in a resonant microwave field, observed for the first time in V(15), should also take place, e.g., in Fe(8) and Mn(12).
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Affiliation(s)
- J H Shim
- Laboratoire de Chimie Inorganique et Biologique, INAC, CEA, Grenoble, France
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Lee IK, Vansaun MN, Shim JH, Matrisian LM, Gorden DL. Increased metastases are associated with inflammation and matrix metalloproteinase-9 activity at incision sites in a murine model of peritoneal dissemination of colorectal cancer. J Surg Res 2012; 180:252-9. [PMID: 22763216 DOI: 10.1016/j.jss.2012.04.074] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2011] [Revised: 03/30/2012] [Accepted: 04/30/2012] [Indexed: 10/28/2022]
Abstract
BACKGROUND Pro-inflammatory processes associated with the early postoperative state are known to contribute to peritoneal metastases in patients with advanced diseases. This study aimed to determine whether the wound healing response after an abdominal incision leads to increased matrix metalloproteinase (MMP)-9 activity locally, contributing to peritoneal metastasis. MATERIALS AND METHODS Metastatic tumors were initiated in C57bl/6J male mice (8wk of age) using a peritoneal injection model with syngeneic MC38 murine colon cancer cells; appropriate control mice also were studied. Injections were performed into the peritoneum in the right lower quadrant. We then observed the occurrence and rate of peritoneal metastasis for each group. RESULTS By making an incision into the abdominal wall of mice, an inflammatory response was induced at the wound site. The inflammatory response initiated by the wound, in turn, increased the proliferation of mesothelial cells and increased inflammatory cell numbers locally, which contributed to an increase in parietal peritoneal metastases. In addition, the wound healing process increased the expression of pro-inflammatory cytokines and the number of inflammatory cells in the peritoneum. Moreover, MMP-9 in the modeled postoperative injury setting increased the number and severity of peritoneal metastases. CONCLUSIONS Thus, we conclude that wound-associated inflammation enhances pro-MMP-9 expression, which plays a key role in the growth and progression of cancer cells associated with peritoneal metastases.
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Affiliation(s)
- In Kyu Lee
- Department of Surgery, St. Mary's Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea
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Shim JH, Ko KJ, Yoo HM, Oh SI, Jeon DJ, Jeon HM, Park CH, Song KY. Morbidity and mortality after non-curative gastrectomy for gastric cancer in elderly patients. J Surg Oncol 2012; 106:753-6. [PMID: 22495554 DOI: 10.1002/jso.23121] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2011] [Accepted: 03/23/2012] [Indexed: 12/19/2022]
Abstract
BACKGROUND AND OBJECTIVES This study examined the surgical outcome of non-curative resection in elderly patients with gastric cancer. METHODS The study reviewed 278 patients who underwent non-curative resection for advanced gastric cancer. The clinicopathological features of elderly patients (≥ 75 years, n = 257) and younger patients (<75 years, n = 21) were compared. RESULTS Although no difference was observed in terms of preoperative performance, there were distinct differences in terms of albumin level, presence of symptoms, and the rate of comorbidities between the two groups. The postoperative morbidity and mortality rate did not differ between the two groups. Age, preoperative performance status, preoperative transfusion, and presence of comorbidity were not independent predictors of postoperative complications. However, the extent of gastric resection and combined resection were closely related to postoperative complications in patients with non-curative gastrectomy. CONCLUSIONS In a setting of non-curative resection for gastric cancer, age was not a limiting factor. Rather, the risk of postoperative morbidity should be considered carefully in total gastrectomy and combined resection.
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Affiliation(s)
- Jung Ho Shim
- Division of Gastrointestinal Surgery, Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
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Song KY, Shim JH. Incidental colonic 18F-FDG uptake in gastric cancer patients: Correlation with colonoscopic and histopathologic findings. J Clin Oncol 2012. [DOI: 10.1200/jco.2012.30.4_suppl.43] [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: 11/20/2022] Open
Abstract
43 Background: The ability of integrated positron emission tomography and computed axial tomography (PET-CT) to detect synchronous colonic pathology in gastric cancer patients is not fully defined. Methods: Between Jan 2009 and July 2010, total 370 patients diagnosed as primary gastric cancer underwent curative resection in our institution. Among them 147 patients had taken PET-CT and colonoscopy preoperatively. The FDG uptake pattern were reviewed and classified as focal (showed foci of FDG uptake>3.5 SUV max), diffuse (showed FDG uptake<3.5 SUVmax without any foci of uptake) and absent uptake (showed no FDG uptake pattern). Patients with history of known colonic malignancy or colon surgery were excluded. Results: Among the 18 patients who had discovered as focal incidental FDG uptake in colon without any previous colonic pathology, in six patients, has revealed unexpected colonic adenocarcinoma. The mean SUVmax value of focal uptake group(Group A) is 7.3 (±2.3), for those six patients, it was 9.4 (±2.9,p=0.02). And in the diffuse uptake group, most common colonic pathology was tubular adenoma with low grade dysplasia following hyperplastic polyp. The age, gender and primary gastric cancer stage was not differed between the groups. Conclusions: In conclusion, the focal uptake pattern in colon on preoperative PET-CT in gastric cancer patients should be followed by colonoscopy evaluation for incidental significant colonic pathology even colon cancer. However, there was no cut off SUVmax value for the mandatory colonoscopy evaluation based on PET-CT.
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Affiliation(s)
- Kyo Young Song
- The Catholic University of Korea, Seoul, South Korea; Division of Gastrointestinal Surgery, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, South Korea
| | - Jung Ho Shim
- The Catholic University of Korea, Seoul, South Korea; Division of Gastrointestinal Surgery, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, South Korea
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Abstract
139 Background: Obesity is considered as a major perioperative risk factor in various cancer surgeries. We aimed to elucidate the effect of two different obesity index, such as VFA (visceral fat area) and BMI (body mass index), on gastrectomy. Methods: From Mar 2009 to July 2010, 632 patients with diagnosed gastric carcinoma underwent curative gastrecomy at Seoul St. Mary’s hospital. We reviewed patients’ clinicopatholic data and collected 187 patients who had data including BMI, VFA and SFA. Patients with body mass index (BMI) ≥ 25 kg/m 2 were defined as obese and visceral fat area (VFA) ≥ 100 were defined as centrally obese. Results: Out of a total 187 patients, eighty patients were in the high BMI group and 107 patients were in the low BMI group. We selected patients with high VFA and low BMI (group A) and compared to the patients with low VFA and low BMI (group B). Out of a total 107 patients in low BMI, seventy three patients were censored as high VFA, and age older than 60 and male patients were prevalent in this group (p=0.045 and 0.046). The operation time (OT) and estimated blood loss (EBL) were significantly higher in group A than group B (p=0.043 and p=0.05). Conclusions: VFA and BMI are correlated each other and successfully represent patients’ obesity. However in selected patients, such as male patients with age older than sixty, VFA more practically represent their obesity.
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Affiliation(s)
- Kyo Young Song
- The Catholic University of Korea, Seoul, South Korea; Division of Gastrointestinal Surgery, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, South Korea
| | - Jung Ho Shim
- The Catholic University of Korea, Seoul, South Korea; Division of Gastrointestinal Surgery, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, South Korea
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Choi HC, Min BI, Shim JH, Haule K, Kotliar G. Temperature-dependent Fermi surface evolution in heavy fermion CeIrIn5. Phys Rev Lett 2012; 108:016402. [PMID: 22304274 DOI: 10.1103/physrevlett.108.016402] [Citation(s) in RCA: 7] [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] [Received: 06/07/2011] [Indexed: 05/31/2023]
Abstract
We address theoretically the evolution of the heavy fermion Fermi surface (FS) as a function of temperature (T), using a first principles dynamical mean-field theory approach combined with density functional theory. We focus on the archetypical heavy electrons in CeIrIn{5}. Upon cooling, both the quantum oscillation frequencies and cyclotron masses show logarithmic scaling behavior [∼ln(T{0}/T)] with different characteristic temperatures T{0}=130 and 50 K, respectively. The enlargement of the electron FSs at low T is accompanied by topological changes around T=10-50 K. The resistivity coherence peak observed at T≃50 K is the result of the competition between the binding of incoherent 4f electrons to the spd conduction electrons at Fermi level (E{F}) and the formation of coherent 4f electrons.
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Affiliation(s)
- Hong Chul Choi
- Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
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Shim JH, Park CH, Song KY. Re: Neoadjuvant Intraperitoneal and Systemic Chemotherapy for Gastric Cancer Patients with Peritoneal Dissemination. Ann Surg Oncol 2011; 18 Suppl 3:S189; author reply S187-8. [DOI: 10.1245/s10434-011-2021-8] [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: 11/18/2022]
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Park J, Lee G, Wolff-Fabris F, Koh YY, Eom MJ, Kim YK, Farhan MA, Jo YJ, Kim C, Shim JH, Kim JS. Anisotropic Dirac fermions in a Bi square net of SrMnBi2. Phys Rev Lett 2011; 107:126402. [PMID: 22026779 DOI: 10.1103/physrevlett.107.126402] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2011] [Indexed: 05/31/2023]
Abstract
We report the observation of highly anisotropic Dirac fermions in a Bi square net of SrMnBi(2), based on a first-principles calculation, angle-resolved photoemission spectroscopy, and quantum oscillations for high-quality single crystals. We found that the Dirac dispersion is generally induced in the (SrBi)(+) layer containing a double-sized Bi square net. In contrast to the commonly observed isotropic Dirac cone, the Dirac cone in SrMnBi(2) is highly anisotropic with a large momentum-dependent disparity of Fermi velocities of ~8. These findings demonstrate that a Bi square net, a common building block of various layered pnictides, provides a new platform that hosts highly anisotropic Dirac fermions.
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Affiliation(s)
- Joonbum Park
- Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
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Yoo HM, Lee HH, Shim JH, Jeon HM, Park CH, Song KY. Negative impact of leakage on survival of patients undergoing curative resection for advanced gastric cancer. J Surg Oncol 2011; 104:734-40. [PMID: 21792945 DOI: 10.1002/jso.22045] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2010] [Accepted: 07/05/2011] [Indexed: 12/13/2022]
Abstract
BACKGROUND AND OBJECTIVES Leakage has been shown to adversely affect survival in patients undergoing surgery for gastrointestinal malignancies. However, the effect of leakage following radical gastrectomy in patients with gastric cancer remains unclear. METHODS In total, 478 patients with advanced gastric cancer who underwent surgery with curative intent were reviewed. Anastomosis or duodenal stump leakage was diagnosed clinically or radiologically. Risk factors for leakage were evaluated by univariate and multivariate analyses. The impact of leakage on patient survival was analyzed using the Kaplan-Meier method. RESULTS Leakage was diagnosed in 32 of 478 patients (6.7%); 14 patients (2.9%) exhibited esophagojejunal anastomotic leakage, 14 (2.9%) showed duodenal stump leakage, and four (0.8%) showed gastroduodenal anastomotic leakage. Poor performance status [odds ratio (OR): 4.01, 95% confidence interval (CI): 1.80-8.93] and tumor location (OR: 3.74, 95% CI: 1.56-8.89) were risk factors for postoperative leakage. Overall mean survival of patients with leakage was significantly lower than that of patients without leakage (30.5 vs. 96.2 months; P < 0.001). Leakage was one of the independent predictive factor for overall survival [hazard ratio (HR): 3.58, 95% CI: 2.29-5.59]. CONCLUSIONS Postoperative inflammation due to leakage is a negative prognostic factor for patients with advanced gastric cancer.
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Affiliation(s)
- Han Mo Yoo
- Division of Gastrointestinal Surgery, Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
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Shim JH, O SI, Song KY. Re: Aggressive surgical approach for patients with T4 gastric carcinoma: promise or myth? Ann Surg Oncol 2011; 18 Suppl 3:S194; author reply S195. [PMID: 21725684 DOI: 10.1245/s10434-011-1886-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2011] [Indexed: 11/18/2022]
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Yoo HM, Lee HH, Shim JH, Jeon HM, Park CH, Kim JG, Song KY. Long-term outcomes and survival after laparoscopy-assisted distal gastrectomy for gastric cancer: three-year survival analysis of a single-center experience in Korea. J Surg Oncol 2011; 104:511-5. [PMID: 21618247 DOI: 10.1002/jso.21982] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2010] [Accepted: 05/04/2011] [Indexed: 01/23/2023]
Abstract
BACKGROUND AND OBJECTIVES Laparoscopy-assisted distal gastrectomy (LADG) has been established as an alternative treatment for early gastric cancer (EGC) because of excellent short-term results. However, only a few reports have considered the long-term outcomes of LADG. In this study, we investigated the 3-year outcome and survival of patients who underwent LADG. METHODS We assessed 182 patients with gastric adenocarcinoma who underwent LADG. The indication for LADG was confined to EGCs (T1N0 or T1N1 cases). The clinicopathological characteristics and long-term survival data of all patients were analyzed. RESULTS The overall morbidity and mortality rates of the patients were 11% and 0%, respectively. An analysis of the final pathological stages of the patients revealed that 160 had stage Ia, 20 had stage Ib, and only 2 had stage II. The median follow-up period was 44 months (range, 2-73 months), and there were two recurrences. Five patients died of other causes, but no patients died of a gastric cancer recurrence. The 3-year overall and disease-specific survival rates were 97.3% and 100%, respectively. CONCLUSIONS LADG for EGC is acceptable in terms of both short- and long-term outcomes. Thus, LADG can be considered a primary treatment for EGC.
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Affiliation(s)
- Han Mo Yoo
- Division of Gastrointestinal Surgery, Department of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea
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Shim JH, Yoo HM, Lee HH, Kim JG, Jeon HM, Song KY, Park CH. Use of laparoscopy as an alternative to computed tomography (CT) and positron emission tomography (PET) scans for the detection of recurrence in patients with gastric cancer: a pilot study. Surg Endosc 2011; 25:3338-44. [PMID: 21533967 DOI: 10.1007/s00464-011-1722-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2011] [Accepted: 03/23/2011] [Indexed: 01/26/2023]
Abstract
BACKGROUND This study aimed to evaluate laparoscopy as a diagnostic method for detecting recurrence in patients with advanced gastric cancer. METHODS Diagnostic laparoscopy was performed for 12 patients with insufficient evidence of intraabdominal gastric cancer recurrence by computed tomography or positron emission tomography. By comparing laparoscopic observations with conventional radiologic results, the diagnostic accuracy of laparoscopy was assessed. RESULTS In 11 (92%) of 12 cases of recurrence not diagnosed by imaging studies, laparoscopic examination confirmed the case as a recurrence. Using diagnostic laparoscopy, retroperitoneal lymph node recurrence was confirmed in two patients, peritoneal seeding nodules in five patients, and recurrent masses invading the mesocolon in two patients. Two patients had no definitive recurrence grossly but were confirmed as recurrence cases by washing cytology during the laparoscopic procedure. One patient had a duodenal stump recurrence. No patients experienced operation-related morbidity. CONCLUSION Laparoscopy is a safe and feasible method for detecting recurrence with acceptable accuracy. This approach provides more accurate information than conventional imaging methods.
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Affiliation(s)
- Jung Ho Shim
- Department of Surgery, St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea, Seoul, Korea
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Shim JH, Lee HH, Yoo HM, Jeon HM, Park CH, Kim JG, Song KY. Intragastric approach for submucosal tumors located near the Z-line: a hybrid laparoscopic and endoscopic technique. J Surg Oncol 2011; 104:312-5. [PMID: 21465489 DOI: 10.1002/jso.21934] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2010] [Accepted: 03/15/2011] [Indexed: 01/27/2023]
Abstract
BACKGROUND The present study was designed to evaluate the feasibility and impact of the "intragastric" approach to laparoscopic wedge resection as a surgical option for the treatment of suspected small sized gastric submucosal tumors (SMTs) located at the level of Z-line. METHODS We reviewed six patients who underwent laparoscopic intragastric resection of a suspected gastric SMT. In all cases, tumor mass was located just below the Z-line. The patients' clinicopathologic characteristics and surgical outcomes were prospectively recorded and reviewed. RESULTS All six patients were underwent successfully laparoscopic wedge resection by the intragastric approach using a balloon-type trocar. No case was required open conversion. The mean operation time was 128 min, and the mean hospital stay was 4 days. Five cases were proven to have leiomyoma, and one case was found to have gastrointestinal stromal tumor with low risk. The mean tumor size was 2.7 cm. CONCLUSION Laparoscopic resection through the "intragastric" approach is a safe and feasible option for gastric SMTs located at the level of Z-line.
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Affiliation(s)
- Jung Ho Shim
- Division of Gastrointestinal Surgery, Department of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea
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Hur H, Kim SG, Shim JH, Song KY, Kim W, Park CH, Jeon HM. Effect of early oral feeding after gastric cancer surgery: a result of randomized clinical trial. Surgery 2010; 149:561-8. [PMID: 21146844 DOI: 10.1016/j.surg.2010.10.003] [Citation(s) in RCA: 91] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2010] [Accepted: 10/18/2010] [Indexed: 12/16/2022]
Abstract
BACKGROUND To date, early oral feeding after gastrectomy for gastric cancer has not been accepted universally. Therefore, we performed a randomized clinical trial to determine whether early oral feeding after curative surgery for gastric cancer can be tolerated and whether it has an effect on recovery. METHODS From July 2008 to February 2009, 58 patients were enrolled and 4 were excluded according to set criteria. The patients in the early feeding group began a liquid diet on the second postoperative day, and then were fed a soft diet from the third day until the day they were discharged. The patients in the control group began a liquid diet on the fourth day. The primary endpoint of this study was the duration of postoperative hospitalization. RESULTS No significant differences were found in the clinico-operative characteristics between the 2 groups. The duration of hospitalization (P = .044) and time until flatus (P = .036) in the early group were decreased significantly. With regard to the rates of morbidity, cost of hospitalization, postoperative symptoms, and pain scales, no significant differences were found. The quality of life scores were decreased significantly at the fatigue (P = .007) and nausea and vomiting (P = .048) immediately after operation in the early feeding group. CONCLUSION Early oral feeding after gastric cancer surgery is feasible and can result in shorter hospitalization and improvements in several aspects of quality of life in the early postoperative period.
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Affiliation(s)
- Hoon Hur
- Department of Surgery, School of Medicine, Ajou University, Suwon, Korea
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Bertaina S, Shim JH, Gambarelli S, Malkin BZ, Barbara B. Spin-orbit qubits of rare-earth-metal ions in axially symmetric crystal fields. Phys Rev Lett 2009; 103:226402. [PMID: 20366115 DOI: 10.1103/physrevlett.103.226402] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2009] [Indexed: 05/29/2023]
Abstract
Contrary to the well-known spin qubits, rare-earth-metal qubits are characterized by a strong influence of crystal field due to large spin-orbit coupling. At low temperature and in the presence of resonance microwaves, it is the magnetic moment of the crystal-field ground state which nutates (for several micros) and the Rabi frequency Omega(R) is anisotropic. Here, we present a study of the variations of Omega(R)(H(0)) with the magnitude and direction of the static magnetic field H(0) for the odd 167Er isotope in a single crystal CaWO(4):Er(3+). The hyperfine interactions split the Omega(R)(H(0)) curve into eight different curves which are fitted numerically and described analytically. These "spin-orbit qubits" should allow detailed studies of decoherence mechanisms which become relevant at high temperature and open new ways for qubit addressing using properly oriented magnetic fields.
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Affiliation(s)
- S Bertaina
- IM2NP, CNRS and Université Paul Cézanne, Avenue Escadrille Normandie Niemen-Case 142-13397 Marseille Cedex 20, France
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Yu JS, Shim JH, Chung JJ, Kim JH, Kim KW. Double contrast-enhanced MRI of viral hepatitis-induced cirrhosis: correlation of gross morphological signs with hepatic fibrosis. Br J Radiol 2009; 83:212-7. [PMID: 19505965 DOI: 10.1259/bjr/70974553] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The purpose of this study was to evaluate the diagnostic ability of the expanded gallbladder fossa and right posterior hepatic notch signs for hepatic fibrosis determined by double contrast-enhanced MRI. For patients with chronic viral hepatitis B (n = 96) or hepatitis C (n = 13) who underwent gadopentate dimeglumine-enhanced dynamic MRI followed by ferucarbotran-enhanced gradient-echo imaging, the degree of parenchymal fibrosis was categorised into three groups based on the extent of reticulation and nodularity: (1) pre-cirrhotic or minimal fibrosis; (2) mild to moderate fibrosis; (3) advanced cirrhosis. Each group was evaluated for the presence of a sharp notch in the posterior-medial surface of the right lobe of the liver and expanded gallbladder fossa. The expanded gallbladder fossa sign gradually increased with an increasing degree of fibrosis (Group 1, 50%; Group 2, 61%; Group 3, 78%), and there was no significant difference (p>0.5) between hepatitis B (67%) and C (73%). In the case of the right posterior hepatic notch sign, only 6% of Group 1 and Group 2 patients were positive; 27% of hepatitis B patients and 90% of hepatitis C patients in Group 3 exhibited the sign (p<0.05). Owing to its low prevalence, even in advanced cirrhosis, the right posterior hepatic notch sign is of little value in the diagnosis of cirrhosis due to chronic hepatitis B virus infection, whereas an expanded gallbladder fossa could be used as a non-specific indicator of early fibrosis before the gross appearance of advanced hepatic fibrosis.
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Affiliation(s)
- J S Yu
- Department of Radiology and the Research Institute of Radiological Science, Yonsei University College of Medicine, Gangnam Severance Hospital, Seoul, Republic of Korea.
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Shim JH, Song KY, Kim SN, Park CH. Laparoscopy-assisted distal gastrectomy for overweight patients in the Asian population. Surg Today 2009; 39:481-6. [PMID: 19468803 DOI: 10.1007/s00595-008-3829-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2008] [Accepted: 06/09/2008] [Indexed: 11/26/2022]
Abstract
PURPOSE It is generally considered difficult to operate on overweight patients, who are also at increased risk of postoperative complications. We conducted this study to clarify the technical feasibility and postoperative outcomes of laparoscopy-assisted distal gastrectomy (LADG) for early gastric cancer (EGC) in overweight patients. METHODS Between July 2004 and December 2006, 116 patients with preoperatively diagnosed EGC underwent LADG at our department. We classified these patients into two groups based on body mass index (BMI). There were 60 patients in the high-BMI (> or =23 kg/m2) group and 56 in the low-BMI (<23 kg/m2) group. The clinicopathologic features, postoperative outcomes, and operation-related morbidities were compared. RESULTS None of the patients needed conversion to laparotomy. There were no notable differences in clinical characteristics or histologic features between the groups. Although the operation time was significantly longer in the high-BMI group, there were no significant differences in postoperative bowel recovery, postoperative hospital stay, or operation-related morbidities. CONCLUSIONS Laparoscopy-assisted distal gastrectomy for overweight patients is feasible and safe; however, because of its technical difficulties and the complexities of lymph node dissection, it should be carefully considered, and may only be suitable for early-stage cancers.
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Affiliation(s)
- Jung Ho Shim
- Department of Surgery, College of Medicine, The Catholic University of Korea, Kangnam St. Mary's Hospital, 505 Banpo-dong, Seocho-gu, Seoul, 137-701, Republic of Korea
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Park SY, Yoo SS, Shim JH, Chin KB. Physicochemical properties, and antioxidant and antimicrobial effects of garlic and onion powder in fresh pork belly and loin during refrigerated storage. J Food Sci 2009; 73:C577-84. [PMID: 19019099 DOI: 10.1111/j.1750-3841.2008.00896.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Pork loin and belly cuts were pumped to 110% of their original weight with solutions containing 5% of various ingredients (sodium ascorbate, garlic, and onion powder), and evaluated the physicochemical properties, and antioxidant and antimicrobial activities during refrigerated storage at 8 degrees C. The addition of garlic and onion powder tended to increase redness (a) and yellowness (b) in both the belly lean and loin with the exception of a few cases. Free fatty acid values in both pork belly and loin cuts were reduced with the addition of these ingredients, as compared to the control. Significant differences in peroxide values were observed in sodium ascorbate and garlic-injected belly, and in sodium ascorbate and onion-injected loin, as compared to the control. Thiobarbituric acid reactive substance values in the pork belly with garlic or onion powder were significantly lower than in the belly without these ingredients or with sodium ascorbate (P < 0.05). Total plate counts were lower in both the belly and loin containing garlic and onion powder, as compared to the control. In both the belly and loin cuts, the content of oxidative products (volatile compounds) was reduced with the addition of garlic and onion powder, particularly the aldehydes (hexanal). Overall, garlic and onion in enhanced meats showed an antioxidant activity as effective as that of sodium ascorbate and also an antimicrobial effect to inhibit the growth of total bacteria and Enterobacteriaceae.
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Affiliation(s)
- S Y Park
- Dept. of Culinary and Foodservice Management, Sejong Univ., Seoul, Korea 506-714
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Chae JI, Ju SK, Lee MK, Park JH, Yoon JH, Shim JH, Lee DS. [cDNA cloning and analysis of tissue-specific gene expression of rat urocortin II]. Mol Biol (Mosk) 2009; 43:91-96. [PMID: 19334530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The corticotropin-releasing hormone (CRH) family of neuropeptides includes CRH (a 41 amino acid hypothalamic peptide) and urocortin. Corticotropin-releasing factor (CRF), a peptide first isolated from mammalian, plays an important role in the regulation of the pituitary-adrenal axis, and in endocrine, autonomic, immune and behavioral responses to stress. In this study we cloned rat urocortin II (UCNII) cDNA from rat mid-brain by RT-PCR. The rat UCNII clone contained an open reading frame (ORF) coding 109 amino acids which shared 90% and 63% homology with mouse and human homologues, respectively, The expression of UCN HII mRNA is mainly distributed in bone marrow, ovary, uterus, hypophysis, adrenal gland, and skin. In this study, rat recombinant UCN was expressed in E. coli and purified in active form. Furthermore, purified recombinant UCN II protein specifically binds to CRF receptor 2 in rat ROS 17/2.8 and GH3 cells by flow-cytometry analysis. UCN II cDNA clone obtained in this study will be useful for further investigation on behavioral responses to stress in rats.
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Kim A, Kwon OS, Kim SO, He L, Bae EY, Lee MS, Jeong SJ, Shim JH, Yoon DY, Kim CH, Moon A, Kim KE, Ahn JS, Kim BY. Caspase-3 activation as a key factor for HBx-transformed cell death. Cell Prolif 2008; 41:755-74. [PMID: 18700866 DOI: 10.1111/j.1365-2184.2008.00550.x] [Citation(s) in RCA: 4] [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: 02/06/2023] Open
Abstract
OBJECTIVES Nuclear factor-kappa B (NF-kappaB) activation has been associated with the tumorigenic growth of hepatitis B virus X protein (HBx)-transformed cells. This study was aimed to find a key target for treatment of HBx-mediated cancers. MATERIALS AND METHODS NF-kappaB activation, endoplasmic reticulum-stress (ER-stress), caspase-3 activation, and cell proliferation were evaluated after Chang/HBx cells permanently expressing HBx viral protein were treated with inhibitors of NF-kappaB, proteasome and DNA topoisomerase. RESULTS Inhibition of NF-kappaB transcriptional activity by transient transfection with mutant plasmids encoding Akt1 and glycogen synthase kinase-3beta (GSK-3beta), or by treatment with chemical inhibitors, wortmannin and LY294002, showed little effect on the survival of Chang/HBx cells. Furthermore, IkappaBalpha (S32/36A) mutant plasmid or other NF-kappaB inhibitors, 1-pyrrolidinecarbonidithioic acid and sulphasalazine, were also shown to have little effect on the cell proliferation. By contrast, proteasome inhibitor-1 (Pro1) and MG132 enhanced the HBx-induced ER-stress response and the subsequent activation of caspase-12, -9 and -3 and reduced cell proliferation. Camptothecin (CPT), however, triggered activation of caspase-3 without induction of caspase-12, and reduced cell proliferation. In addition, CPT-induced cell death was reversed by pre-treatment with z-DEVD, a caspase-3-specific inhibitor. CONCLUSIONS Detailed exploitation of the regulators of caspase-3 activation could open the gate for finding an efficient target for development of anticancer therapeutics against HBx-transformed hepatocellular carcinoma.
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Affiliation(s)
- A Kim
- Functional Metabolomics Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Yuseong, South Korea
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Khay S, Choi JH, Abd El-Aty AM, Mamun MIR, Park BJ, Goudah A, Shin HC, Shim JH. Dissipation behavior of lufenuron, benzoylphenylurea insecticide, in/on Chinese cabbage applied by foliar spraying under greenhouse conditions. Bull Environ Contam Toxicol 2008; 81:369-372. [PMID: 18592122 DOI: 10.1007/s00128-008-9490-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2008] [Accepted: 06/06/2008] [Indexed: 05/26/2023]
Abstract
Chinese cabbage has long been consumed as a staple food by the Koreans in various forms of fresh, salted, or fermented as kimchi. To fulfill the off-season demand for this crop, it has become a common practice to be cultivated under greenhouse conditions. Since pesticide residues in/on leafy vegetables have strongly concerned with food safety in the Korean society, the changes of lufenuron residues, in/on Chinese cabbage applied by foliar spraying under greenhouse conditions was investigated. Lufenuron 5% emulsifiable concentrate (EC) was sprayed with diluted solution of recommended and double doses to the crop. The shoots of the cabbage were harvested immediately after spraying, and sequentially the harvests were conveyed to analyze the residual amounts. The deposited level of the analyte in/on Chinese cabbage under greenhouse conditions seemed to be difficult to produce the crop with 0.2 ppm of maximum residue limit (MRL) of the Korea Food and Drug Administration (KFDA).
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Affiliation(s)
- S Khay
- Natural Products Chemistry Laboratory, Institute of Agricultural Science and Technology, Chonnam National University, 300 Yong-Bong Dong, Buk-gu, Gwangju 500-757, Republic of Korea
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Shim JH, Haule K, Savrasov S, Kotliar G. Screening of magnetic moments in PuAm alloy: local density approximation and dynamical mean field theory study. Phys Rev Lett 2008; 101:126403. [PMID: 18851396 DOI: 10.1103/physrevlett.101.126403] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2008] [Indexed: 05/26/2023]
Abstract
The puzzling absence of Pu magnetic moments in a PuAm environment is explored using the self-consistent dynamical mean field theory calculations in combination with the local density approximation. We argue that delta-Pu-Am alloys provide an ideal testbed for investigating the screening of moments from the single impurity limit to the dense limit. Several important effects can be studied: volume expansion, shift of the bare Pu on-site f energy level, and the reduction of the hybridization cloud resulting from the collective character of the Kondo effect in the Anderson lattice. These effects compensate each other and result in a coherence scale, which is independent of alloy composition, and is around 800 K.
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Affiliation(s)
- J H Shim
- Department of Physics, Rutgers University, Piscataway, NJ 08854, USA
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