Yu Jin Kim

Seoul National University Bundang Hospital, Sŏul, Seoul, South Korea

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Publications (129)307.17 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: A series of small molecules that contained identical π-spacers (ethyne), a central diketopyrrolopyrrole (DPP) unit, and different aromatic electron-donating end-groups were synthesized and used in organic solar cells (OSCs) to study the effect of electron-donating groups on the device performance. The three compounds, DPP-A-Ph, DPP-A-Na, and DPP-A-An, possessed intense absorption bands that covered a wide range, from 350 to 750 nm, and relatively low HOMO energy levels, from -5.50 to -5.55 eV. DPP-A-An, which contained anthracene end-groups, demonstrated a stronger absorbance and a higher hole mobility than DPP-A-Ph, which contained phenyl groups, and DPP-A-Na, which contained naphthalene units. The power-conversion efficiencies (PCEs) of OSCs based on organic:PC71 BM blends (1:1, w/w) with a processed DIO additive were 3.93 % for DPP-A-An, 3.02 % for DPP-Na, and 2.26 % for DPP-A-Ph. These findings suggest that a DPP core that is functionalized with electron-donating capping groups constitutes a promising new class of solution-processable small molecules for OSC applications.
    Chemistry - An Asian Journal 07/2014; · 4.57 Impact Factor
  • Advanced Energy Materials 07/2014; · 10.04 Impact Factor
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    ABSTRACT: Vancomycin-resistant enterococci (VRE) are one of the leading causes of nosocomial infection at intensive care unit (ICU). Rapid and sensitive detection of VRE infection is in high demand for timely and suitable antibiotic treatment. Here, we optimized a distinct DNA-based diagnostic technique, loop-mediated isothermal amplification (LAMP) for rapid detection of the presence of vanA gene, a critical component of the gene cluster required for vancomycin resistance. Amplification efficiency was optimal at 62 ˚C and with 2mM MgSO4. The detection limit of the DNA template was 80pg and LAMP amplicons were detected within 40min; thereby suggesting a potential applicability of LAMP as a sensitive and urgent diagnostic method. Furthermore, positive LAMP reaction was directly detected with the naked-eye by monitoring the formation of a white precipitate or the color change induced by hydroxyl naphtol blue (HNB) dye. Finally, 56 clinical isolates were successfully tested for the presence of vanA gene by LAMP, which was determined to be more sensitive than PCR. Together, our results clearly demonstrate the usefulness of LAMP for the diagnosis of VRE infection.
    Journal of microbiological methods. 06/2014;
  • Qing Jin, Ling Li, Yu Jin Kim, Nam Soo Han
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    ABSTRACT: AimsLeuconostoc citreum is an important lactic acid bacterium in fermented foods, but dextran production often causes undesired ropiness. To prevent this side effect, a dextran-free mutant needs to be created.Methods and ResultsHomologous recombination of the dextransucrase gene (dsrC) was conducted using a segregationally unstable plasmid, pCBM32-DSUDs. A mutant was obtained on sucrose agar medium, and a site-specific insertional inactivation in the gene was confirmed. When cultured in sucrose medium, the mutant strain produced no dextransucrase or dextran. Additionally, it showed a longer lag phase (9 h) than the wild type strain (3 h), providing new insights into the role of dextransucrase in carbohydrate metabolism of Leuconostoc.Conclusions In this study, a dextransucrase knock-out mutant was constructed. It was found that L. citreum dextransucrase not only synthesizes dextran for cell protection but also provide fructose as an important carbon source for cell growth.Significance and Impact of the StudyThis knock-out mutation was generated for the first time in L. citreum. The dextran-free mutant has the potential to be used for various industrial purposes, including as a starter culture for production of non-viscous fermented foods and as a dextran-free host for production of recombinant proteins.This article is protected by copyright. All rights reserved.
    Journal of Applied Microbiology 06/2014; · 2.20 Impact Factor
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    ABSTRACT: MET, a cell surface receptor for hepatocyte growth factor, is involved in the development of triple-negative/basal-like breast cancer (TNBC/BLBC). However, its utility as a therapeutic target in this subtype of breast cancer is poorly understood. To evaluate MET fully as a potential therapeutic target for TNBC/BLBC, we investigated the relationship between MET expression and clinical outcomes of patients with breast cancer and the functional effect of MET inhibition. Using automated immunohistochemistry (Ventana), we analyzed MET expression in 924 breast cancer patients with relevant clinicopathologic parameters. BLBC showed the strongest relationship with MET expression (57.5%, p < 0.001). High expression of MET in breast cancer resulted in poor overall survival (p = 0.001) and disease-free survival (DFS, p = 0.010). MET expression was relatively high in TNBC cell lines, and the silencing of MET via small interfering RNA reduced cell proliferation and migration. We observed reduced TNBC cell viability after treatment with the MET inhibitor PHA-665752. In the most drug-resistant cell line, MDA-MB-468, which showed elevated epidermal growth factor receptor (EGFR) expression, silencing of EGFR resulted in increased sensitivity to PHA-665752 treatment. We confirmed that PHA-665752 synergizes with the EGFR inhibitor erlotinib to decrease the viability of MDA-MB-468 cells. TNBC patients coexpressing MET and EGFR showed significantly worse DFS than that in patients expressing EGFR alone (p = 0.021). Our findings strongly suggest that MET may be a therapeutic target in TNBC and that the combined therapy targeting MET and EGFR may be beneficial for the treatment of TNBC/BLBC patients.
    International Journal of Cancer 05/2014; 134(10). · 6.20 Impact Factor
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    ABSTRACT: To evaluate the effect of side chain characteristics on the photovoltaic performance of small molecules containing both benzodithiophene (BDT) and thienopyrroledione (TPD), we designed and synthesized two such molecules, one containing a branched 2-ethylhexyl (2EH) side chain on the BDT unit () and the other containing a linear n-octyl (C8) side chain on the BDT unit (). The optical and electrochemical properties and crystalline structures of these molecules were examined. Compared to , showed stronger light absorption, longer-range ordering and shorter π-π stacking distances between backbones. As a result, the power conversion efficiency of a bulk heterojunction solar cell based on (2.40%) was substantially higher than that of the device (1.12%).
    Physical Chemistry Chemical Physics 03/2014; · 3.83 Impact Factor
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    ABSTRACT: We report a series of benzotriazole-based semicrystalline π-conjugated polymers with noncovalent conformational locks for applications in polymer field-effect transistors. The benzotriazole moiety is a versatile electron-deficient building block that offers two chemically functionalizable sites, 2(N) and 5, 6(C) positions, allowing easy modulation of the solution processability and electronic structures of the resulting polymers. Fluorine or alkoxy substituents were introduced to the benzotriazole unit to enhance the molecular ordering through intra- and intermolecular F···S, F···H–C, C–F···πF, or S···O attractive interactions. The fluorinated polymer (PTBTz-F) showed remarkably enhanced hole mobility (μh = 1.9 cm2/(V·s), on/off ratio = 8 × 107) upon thermal annealing at 305 °C, compared to the unsubstituted one (PTBTz) (μh = 7.0 × 10–3 cm2/(V·s), on/off ratio = 3 × 106). Alkoxy unit substitution (PTBTz-OR) also improved the carrier mobility up to 0.019 cm2/(V·s) with an on/off ratio of 4 × 105. Fluorine or alkoxy substitution induced tight interchain ordering with edge-on orientation, as confirmed by X-ray diffraction measurements. In particular, fluorinated PTBTz-F showed high thermal stability (Td 453 °C) and the remarkable device characteristics with deep frontier orbital levels.
    Chemistry of Materials. 03/2014; 26(6):2147–2154.
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    ABSTRACT: To elucidate the origin of the formation of the ferroelectric phase in Hf0.5Zr0.5O2 films, the effects of film strain and crystallographic orientation on the properties were examined. Using a (111)-textured Pt bottom electrode, Hf0.5Zr0.5O2 films with a (111)-preferred texture inappropriate for transforming their phase from non-ferroelectric tetragonal to ferroelectric orthorhombic phase were deposited. In contrast, randomly oriented Hf0.5Zr0.5O2 films, grown on the TiN electrode, showed feasible ferroelectric properties due to their transformation to the ferroelectric orthorhombic phase. The origin of such transformation is the large in-plane tensile strain for the elongation of the c-axis of the tetragonal phase.
    01/2014; 104(7).
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    ABSTRACT: Two small molecules named BT-TPD and TBDT-TTPD with a thieno[3,4-c]pyrrole-4,6-dione (TPD) unit were designed and synthesized for solution-processed bulk-heterojunction solar cells. Their thermal, electrochemical, optical, charge-transport, and photovoltaic characteristics were investigated. These compounds exhibit strong absorption at 460-560 nm and low highest occupied molecular orbital levels (-5.36 eV). Field-effect hole mobilities of these compounds are 1.7-7.7×10(-3) cm(2) V(-1) s(-1) . Small-molecule organic solar cells based on blends of these donor molecules and a acceptor display power conversion efficiencies as high as 4.62 % under the illumination of AM 1.5G, 100 mW cm(-2) .
    Chemistry - An Asian Journal 01/2014; · 4.57 Impact Factor
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    ABSTRACT: Rhabdomyosarcoma (RMS) is the most commonly occurring type of soft tissue tumor in children. However, it is rare in adults, and therefore, very little is known about the most appropriate treatment strategy for adult RMS patients. We performed genomic analysis of RMS cells derived from a 27-year-old male patient whose disease was refractory to treatment. A peritoneal seeding nodule from the primary tumor, pleural metastases, malignant pleural effusion, and ascites obtained during disease progression, were analyzed. Whole exome sequencing revealed 23 candidate variants, and 10 of 23 mutations were validated by Sanger sequencing. Three of 10 mutations were present in both primary and metastatic tumors, and 3 mutations were detected only in metastatic specimens. Comparative genomic hybridization array analysis revealed prominent amplification in the 12q13-14 region, and more specifically, the CDK4 proto-oncogene was highly amplified. ALK overexpression was observed at both protein and RNA levels. However, an ALK fusion assay using NanoString technology failed to show any ALK rearrangements. Little genetic heterogeneity was observed between primary and metastatic RMS cells. We propose that CDK4, located at 12q14, is a potential target for drug development for RMS treatment.
    Scientific Reports 01/2014; 4:3623. · 2.93 Impact Factor
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    ABSTRACT: Objective Advanced airway management is one of the fundamental skills of advanced cardiac life support (ACLS). A failed initial intubation attempt (FIIA) is common and has shown to be associated with adverse events. We analysed the association between FIIA and the overall effectiveness of ACLS. Methods Using emergency department (ED) Out-of-hospital cardiac arrest (OHCA) registry data from 2008 to 2012, non-traumatic ED-resuscitated adult OHCA patients on whom endotracheal intubation was initially tried were identified. Prehospital and demographic factors and patient outcomes were retrieved from the registry. The presence of a FIIA was determined by reviewing nurse-documented CPR records. The primary outcome was achieving a return of spontaneous circulation (ROSC). The secondary outcomes were time to ROSC and the ROSC rate during the first 30 minutes of ED resuscitation. Results The study population (n = 512) was divided into two groups based on the presence of a FIIA (N = 77). Both groups were comparable without significant differences in demographic or prehospital factors. In the FIIA group, the unadjusted and adjusted odds ratios (ORs) for achieving a ROSC were 0.50 (95% confidence interval [CI], 0.31-0.81) and 0.40 (95% CI, 0.23-0.71), respectively. Multivariable median regression analysis revealed that FIIA was associated with an average delay of 3 minutes in the time to ROSC (3.08; 95% CI, 0.08-5.80). Competing risk regression analysis revealed a significantly slower ROSC rate during the first 15 minutes (adjusted subhazard ratio, 0.52; 95% CI, 0.35-0.79) in the FIIA group. Conclusion FIIA is an independent risk factor for the decreased effectiveness of ACLS.
    Resuscitation 01/2014; · 4.10 Impact Factor
  • Organic Electronics 01/2014; · 3.84 Impact Factor
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    ABSTRACT: Vancomycin-resistant enterococci (VRE) are one of the leading causes of nosocomial infection at intensive care unit (ICU). A rapid and sensitive detection of VRE infection is in high demand for timely and suitable antibiotic treatment. Here, we optimized a distinct DNA-based diagnostic technique, loop-mediated isothermal amplification (LAMP) for a rapid detection of the presence of vanA gene, a critical component of the gene cluster required for vancomycin resistance. Amplification efficiency was optimal at 62 °C and with 2 mM MgSO4. The detection limit of the DNA template was 80 pg and LAMP amplicons were detected within 40 min; thereby suggesting a potential applicability of LAMP as a sensitive and urgent diagnostic method. Furthermore, positive LAMP reaction was directly detected with the naked-eye by monitoring the formation of a white precipitate or the color change induced by hydroxy naphthol blue (HNB) dye. Finally, 56 clinical isolates were successfully tested for the presence of vanA gene by LAMP, which was determined to be more sensitive than PCR. Together, our results clearly demonstrate the usefulness of LAMP for the diagnosis of VRE infection.
    Journal of Microbiological Methods. 01/2014;
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    ABSTRACT: A facile spin-coating method in which a small percentage of the solvent additive, 1-chloronaphthalene (CN), is found to increase the drying time during film deposition, is reported. The field-effect mobility of a PDPPDBTE film cast from a chloroform-CN mixed solution is 0.46 cm(2) V(-1) s(-1) . The addition of CN to the chloroform solution facilitates the formation of highly crystalline polymer structures.
    Advanced Materials 10/2013; · 14.83 Impact Factor
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    ABSTRACT: Abstract Background. Silent peptic ulcer has been considered to be associated with nonsteroidal anti-inflammatory drug (NSAID). The recent studies have reported no relationship between them. Aim. We attempted to investigate an association between asymptomatic peptic ulcer and NSAID in Korean adults. Methods. The subjects were enrolled from participants visiting Myongji Hospital for health examination program of the Korean National Health Insurance Corporation. The questionnaires were designed to investigate individual medical information and gastroduodenal symptoms. Results. From May 2005 to March 2009, 5459 participants were enrolled and 299 participants were excluded. Of 5160 participants, 3144 (60.9%) participants were asymptomatic and 424 (8.2%) participants had peptic ulcer. Among 3144 asymptomatic participants, NSAID-taking participants had the odds ratio of 1.4 [95% confidence interval (CI): 0.7-2.6, p = 0.339] for the risk of peptic ulcer. Among 424 peptic ulcer patients, 247 (58.3%) were asymptomatic. They had lower prevalence of NSAID use (4.9% vs. 14.7%). The asymptomatic gastric ulcer patients had smaller size and more frequent healing stage than the symptomatic gastric ulcer patients. In multivariable analysis of 424 peptic ulcer patients, NSAID patients had the odds ratio of 0.249 (95%CI: 0.115-0.536, p < 0.05) for asymptomatic peptic ulcer. In subgroup analysis of 284 gastric ulcer patients, NSAID-taking patients had the odds ratio of 0.263 (95% CI: 0.105-0.657, p = 0.004) for asymptomatic peptic ulcer. Conclusion. NSAID has an inverse association with asymptomatic patients with gastric peptic ulcer, but has no association with gastroduodenal symptoms in duodenal ulcer patients. These suggest that NSAID may be associated with gastroduodenal symptoms rather than masking symptoms, at least in gastric ulcer patients.
    Scandinavian journal of gastroenterology 09/2013; · 2.08 Impact Factor
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    ABSTRACT: IgG4-related systemic diseases are characterized by a diffuse or mass forming inflammatory reaction rich in lymphocytes and IgG4-positive plasma cells (lymphoplasmacytic infiltration), fibrosclerosis of variable organs and obliterative phlebitis. They usually involve various organs including the pancreas, bile duct, gallbladder, salivary gland, retroperitoneum, kidney, lung, and prostate. However, most of them are accompanied by autoimmune pancreatitis, and good response to steroid treatment is one of the hallmarks of this disease. We report a case of an 67-year-old man with IgG4 associated sclerosing cholangitis, who was diagnosed by endoscopic retrograde cholangiopancreatography and successfully treated with steroid therapy. (Korean J Gastroenterol 2013;62:69-74).
    The Korean journal of gastroenterology = Taehan Sohwagi Hakhoe chi 07/2013; 62(1):69-74.
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    ABSTRACT: The amplification of MDM2 and CDK4 is the main molecular feature of well-differentiated liposarcomas (WDLS) and dedifferentiated liposarcomas (DDLS). Although the diagnostic usefulness of this molecular characteristic in liposarcomas has been investigated, its prognostic utility of quantitative gene level has not been explored. The aim of this study was to assess the prognostic significance of level of CDK4 amplification in MDM2-amplified WDLS/DDLS. MDM2 amplification in liposarcomas was confirmed by fluorescence in situ hybridization. The copy number of MDM2 and CDK4 was further determined by quantitative PCR (qPCR) and multiplex ligation-dependent probe amplification. Among 56 MDM2-amplified liposarcomas, 30 cases were assigned as WDLS, and 26 as DDLS. When liposarcomas were classified by qPCR-determined CDK4 amplification levels, the high-CDK4 group showed significantly poorer progression free survival (P = 0.001) and disease specific survival (P=0.033) than the low-CDK4 group. However, MDM2 amplification level did not show prognostic significance. In WDLS/DDLS, the level of CDK4 amplification was useful for prognosis prediction and precise stratification of patients for targeted therapy.
    Histology and histopathology 07/2013; · 2.28 Impact Factor
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    ABSTRACT: The effects of annealing temperature (Tanneal) and film thickness (tf) on the crystal structure and ferroelectric properties of Hf0.5Zr0.5O2 films were examined. The Hf0.5Zr0.5O2 films consist of tetragonal, orthorhombic, and monoclinic phases. The orthorhombic phase content, which is responsible for the ferroelectricity in this material, is almost independent of Tanneal, but decreases with increasing tf. In contrast, increasing Tanneal and tf monotonically increases (decreases) the amount of monoclinic (tetragonal) phase, which coincides with the variations in the dielectric constant. The remanant polarization was determined by the content of orthorhombic phase as well as the spatial distribution of other phases.
    Applied Physics Letters 06/2013; 102(24). · 3.79 Impact Factor
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    ABSTRACT: Abstract Background. False positives of fecal occult blood tests (FOBT) regarding colorectal cancer detection are common. The aim was to investigate the upper gastrointestinal (GI) condition confirmed by endoscopy in positive FOBT patients without advanced colorectal neoplasia, hemorrhoid, or colitis. Methods. The authors reviewed the collective data of 340 positive FOBT patients who underwent both esophagogastroduodenoscopy (EGD) and colonoscopy from January 2005 to October 2011. Demographic data, effects of medications, including antiplatelet agents, nonsteroidal anti-inflammatory drugs, or warfarin on the results of FOBT, presence or absence of GI mucosal lesions confirmed by EGD and colonoscopy, and FOBT titer in 552 positive FOBT patients were analyzed. Results. On colonoscopy, colorectal cancer was detected in 35 patients (10.3%), advanced adenoma in 22 patients (6.4%). "Negative colonoscopy" included no significant lesions and non-advanced adenomas. In 243 patients with "negative colonoscopy", EGD findings included 3 (1.2%) gastric cancers and 39 (16%) peptic ulcer diseases. Gastric cancers were all found in patients who had no experience of EGD within 2 years; however, the incidence of peptic ulcer disease was not different in patients with or without previous EGD within 2 years. Two or more antiplatelet agents increased false positive rates of FOBT. Conclusions. Upper GI evaluation is mandatory in patients with positive FOBTs and negative colonoscopy especially in patients without experience of EGD within 2 years.
    Scandinavian journal of gastroenterology 06/2013; 48(6):657-662. · 2.08 Impact Factor
  • Hepato-gastroenterology 04/2013; 60(128). · 0.77 Impact Factor

Publication Stats

336 Citations
307.17 Total Impact Points

Institutions

  • 2014
    • Seoul National University Bundang Hospital
      • Department of Emergency Medicine
      Sŏul, Seoul, South Korea
    • MEDIPOST Biomedical Research Institute
      Sŏul, Seoul, South Korea
  • 2013–2014
    • Pohang University of Science and Technology
      • Department of Chemical Engineering
      Geijitsu, North Gyeongsang, South Korea
    • Hallym University Medical Center
      • Department of Pathology
      Seoul, Seoul, South Korea
  • 2011–2014
    • Seoul National University
      • Department of Materials Science and Engineering
      Sŏul, Seoul, South Korea
  • 2007–2014
    • Yonsei University Hospital
      • Department of Internal Medicine
      Sŏul, Seoul, South Korea
  • 2012–2013
    • Sungkyunkwan University
      • • Department of Pathology
      • • School of Medicine
      Sŏul, Seoul, South Korea
    • Korea Research Institute of Bioscience and Biotechnology KRIBB
      • Functional Metabolite Research Center
      Anzan, Gyeonggi Province, South Korea
  • 2011–2012
    • Myongji Hospital
      Kōyō, Gyeonggi Province, South Korea
  • 2009–2012
    • Chungbuk National University
      • Department of Food Science and Technology
      Chinch'ŏn, North Chungcheong, South Korea
  • 2008–2012
    • Gachon University
      • Department of Internal Medicine
      Sŏngnam, Gyeonggi Province, South Korea
    • Hallym University
      • College of Medicine
      Seoul, Seoul, South Korea
  • 2007–2008
    • Hanyang University
      • Department of Biomedical Engineering
      Sŏul, Seoul, South Korea
  • 2003–2007
    • Inha University
      • • College of Medicine
      • • Department of Plastic Surgery
      Seoul, Seoul, South Korea
  • 2004
    • Inha University Hospital
      Sinhyeon, South Gyeongsang, South Korea