• Asian Pacific Journal of Cancer Prevention
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• 제16권14호
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• pp.6089-6092
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• 2015

Background: The prevalence of metronidazole-resistant H. pylori is almost 50% in Thailand which severely limits the use of this drug for eradication therapy. The aims of this study were to evaluate the efficacy and safety profiles of 7-day bismuth-based quadruple therapy including metronidazole as an initial treatment for H. pylori infection in a high metronidazole resistance area. Materials and Methods: This study was performed at Thammasat University Hospital and King Chulalongkorn Memorial Hospital during January 2009 to October 2010. Patients with non-ulcer dyspepsia (NUD) with active H. pylori infection were assigned to receive seven days of quadruple therapy (pantoprazole 40 mg bid, bismuth subsalicylate 1,048 mg bid, amoxicillin 1 gm bid and metronidazole 400 mg tid). H. pylori infection was defined as positive H. pylori culture or two positive tests (rapid urease test and histology). Antibiotic susceptibility test for metronidazole by Epsilometer test (E-test) was performed in all positive cultures. At least four weeks after treatment, $^{13}C$ urea breath test ($^{13}C-UBT$) was performed to confirm H. pylori eradication. Results: A total of 114 patients were enrolled in this study, 50 males and 64 females with a mean age of 49.8 years. All 114 patients had a diagnosis of NUD. Overall eradication as confirmed by negative $^{13}C-UBT$ was achieved in 94 out of 114 patients (82.5%). 44 patients had positive cultures and success for E-test. In vitro metronidazole resistance was observed in 22/44 (50%) patients. Eradication rate in patients with metronidazole resistant strains was 16/22 (72.7%) and 20/22 (90.1%) with metronidazole sensitive strains (72.7% vs 90.1%, p-value=0.12; OR=3.75 [95%CI=0.6-31.5]). Minor adverse reactions included nausea, bitter taste, diarrhea and black stools but none of the patients dropped out from the study. Conclusions: Initial treatment with 7-day bismuth-based quadruple therapy including metronidazole, amoxycillin and pantoprazole is highly effective and well tolerated for metronidazole-sensitive H. pylori infections. However, the efficacy markedly decline with metronidazole resistance. Longer duration of this regimen might be required to improve the eradication rate and larger multi-center studies are needed to confirm this hypothesis.

• Journal of Chest Surgery
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• 제18권1호
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• pp.79-85
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• 1985

The effect of graded increments in positive end-expiratory pressure [PEEP] on hemodynamics required to ventilate 8 critically ill patients is reported. Acute respiratory insufficiency was a cause of death in only one patient of drug inoxication among the 8 patients studied. The cardiac output was not changed significantly after the increment of PEEP to the level of 20 cm H2O. The heart rate was increased significantly from 15 cm H2O PEEP [P<0.01] as compared to 0 cm H2O PEEP; and the stroke volume was decreased significantly from 15 cm H2O PEEP [P<0.05]. The blood pressure was not affected at any level of PEEP, but the pulmonary artery pressure was elevated significantly at 10 cm H2O PEEP [P<0.01]. The right ventricular transmural filling pressure was not affected at the level of 10 cm H2O PEEP, but from 15 cm H2O PEEP it was increased significantly. With the increment of PEEP, the left ventricular stroke work index was decreased slightly; and at 20 cm H2O PEEP, it was decreased significantly. The right ventricular stroke work index was increased only at 10 cm H2O PEEP. The systemic vascular resistance was decreased significantly from 15 cm H2O PEEP [P<0.01].

• Asian Pacific Journal of Cancer Prevention
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• 제16권7호
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• pp.2591-2600
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• 2015

Breast cancer is the most common cancer worldwide among women and the second most common cancer. Approximately 15-23% of breast cancers over-express human epidermal growth factor receptor2 (HER2), a 185-kDa transmembrane tyrosine kinase, which is mainly found at the cell surface of tumor cells. HER2-positive breast cancer, featuring amplification of HER2/neu and negative expression of ER and PR, has the three following characteristics: rapid tumor growth, lower survival rate, and better response to adjuvant therapies. Clinically, it is notable for its role in a pathogenesis that is associated with increased disease recurrence and acts as a worse prognosis. At the same time, it represents a good target for anti-cancer immunotherapy despite the prevalence of drug resistance. New treatments are a major topic of research, and a brighter future can be expected. This review discusses the role of HER2 in breast cancer, therapeutic modalities available and prognostic factors.

• 한국물환경학회지
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• 제28권6호
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• pp.911-916
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• 2012

Recently, antibiotic resistant genes (ARGs) in the environment are emerging as pollutants, since these genetic contaminants can eventually be transferred to human pathogens. The aim of this study was to develop the experimental model of antibiotic resistant gene (ARG) plasmid transfer as a function of various environmental conditions. For this purpose, the multi drug resistant plasmid pB10, which is known to be originally isolated from a wastewater treatment plant, was selected as a model transfer plasmid and Escherichia coli $DH5{\alpha}$ containing pB10 was used as a model donor. Pseudomonas aeruginosa, an opportunistic pathogen, was selected as the recipient for the conjugation experiment. When the donor and recipient were exposed to various stressors including antibiotics and heavy metal as a function of the concentrations (10, 100 and, 1000 ppb), statistically increased plasmid transfer rate was observed at a concentration of 10 ppb of tetracycline and sulfamethoxazole compared to control (no antibiotic exposure). Accordingly, the developed experimental ARG model by various stressor is a promising tool for evaluating the dissemination of ARGs by micro-contaminants in aquatic environment.

• 한국수정란이식학회:학술대회논문집
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• 한국수정란이식학회 1998년도 춘계학술대회 및 워크숍
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• pp.12-28
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• 1998

The technology of creating transgenic animals has a potential value in improving productivity and disease resistance of animals, gene therapy, drug pharming and production of model animals for certain diseases. Up to date, fairly low success rate of production of transgenic animals and a pronounced variability with respect to the expression of transgenes have been much observed. The mechanisms how to integrate the injected genes with a certain part of the genomes are unknown yet. Many techniques in gene transfer, beside microinjection, have been introduced and explored thus to improve the production efficiency of transgenic animals. In this article, the methods and efficiency of gene-transfer techniques, the detection and preselection of transgenes in embryos by PCR- and GFP-screenings and cloning of preselected transgenic embryos by nuclear transplantation are described and discussed. Some experimental results showed that the early screening and selection of integration of the injected gene with embryonic genome by polymerase chain reaction(PCR) and green fluorecence protein(GFP) were promising methods. Further, the application of nuclear transplantation technology to cloning and multiplication of the positively integrated genes in the cleaving embryos and embryonic cells will be beneficially used for the mass production of transgenic embryos and consequently improving the production efficiency in transgenic animals.

• Journal of Preventive Medicine and Public Health
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• 제52권1호
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• pp.66-70
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• 2019

Objectives: In the Republic of Korea (ROK), the notified incidence of tuberculosis in foreign-born individuals (NITFBI) has increased recently, as has the rate of multidrug-resistant (MDR) and rifampicin-resistant (RR) tuberculosis in foreigners staying in the ROK. As Jeju Province in ROK has a no-visa entry policy, control programs for NITFBI should be consolidated. The aim was to evaluate the status of NITFBI, with a focus on the distribution of MDR/RR tuberculosis by nationality. Methods: Data on tuberculosis incidence in individuals born in Jeju Province and in foreign-born individuals were extracted from the Korean Statistical Information Service of Statistics Korea, and the Infectious Disease Surveillance Web Statistics of the Korea Centers for Disease Control and Prevention, respectively. Results: Among all notified incident cases of tuberculosis, the proportion of NITFBI increased from 1.46% in 2011 to 6.84% in 2017. China- and Vietnam-born individuals accounted for the greatest proportion of the 95 cases of NITFBI. Seven cases of MDR/RR tuberculosis were found, all involving patients born in China. Conclusions: In Jeju Province, ROK, NITFBI might become more common in the near future. Countermeasures for controlling active tuberculosis in immigrants born in high-risk nations for tuberculosis should be prepared in Jeju Province, since it is a popular tourist destination.

• 한국환경보건학회지
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• 제24권1호
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• pp.141-150
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• 1998

This study was performed to investigate the distribution of Yersiniae and correlation between Yersiniae and indicator organism by time and area in spring water located in northern part of Seoul. Samples collected from 46 spring waters located in four mountains(Dobong, Bukhan, Surak, Bulam) were inspected to detect Yersiniae and indicator organisms. And also there were examined bioserological characteristics and resistance of ahtibiotics of the isolated Yersiniae.The result were as follows. 1. The isolation rate of Yersiniae was 22% in February and 20% in April. The isolated species were 6 strains of Y. enterocolitica, 6 strains of Y. aldova, 4 strains of Y. intermedia and 43 strains of Y. pseudotuberculosis. The serotype of Y. pseudotuberculosis isolated from was all O:5 and biotype of Y. enterocolitica isolated from was all O:3. 2. The Geometric mean of standard plate count, coliform, and psychrotrophilic bacteria were 3.4 CFU/ml, 1.2 MPN/100 ml and 33.0 CFU/ml in February and 3.1 CFU/ml, 1.5 MPN/100 ml and 20.5 CFU/ml in April respectively. There was no significant difference by time and area but the indicator organisms were correlated significantly with each other (p<0.05). 3. Because detection of Yersiniae was not statistically associated with indicator organism, Yersiniae can be detected in the spring water approved microbiologically (p<0.05). 4. The Yersiniae isolated were resistant to Ampicillin, Colistin, Carbenicillin and Coilstin. All isolaed Y. enterocolitica were resistant to Ampicillin (100%). In the case of Y. pseudotuberculosis, only 1 of 3 isolated was resistant to Colistin but susceptible to other antibiotics.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제49권4호
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• pp.198-207
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• 2023

Objectives: This study investigated causative strains and their antibiotic sensitivity in patients who were hospitalized for maxillofacial odontogenic infections at a tertiary center in South Korea over the past 10 years with the aim of providing guidelines for the selection of appropriate empirical antibiotics. Materials and Methods: Patients with head and neck fascial space abscesses due to odontogenic infections who underwent incision and drainage surgery with pus culture tests between 2013 and 2022 at the Department of Oral and Maxillofacial Surgery, Dankook University Hospital were included. The bacterial isolates and antibiotic sensitivity of each strain were analyzed for 2013-2022, 2013-2017, and 2018-2022. The affected fascial spaces were classified into primary, secondary, and deep neck spaces. Results: In the 192 patients included in this study, 302 strains were detected. Viridans streptococcus had the highest frequency (51.7%), followed by Prevotella spp. (16.9%), Staphylococcus spp. (5.6%), and Klebsiella pneumoniae (4.6%). The identification rate of viridans streptococcus significantly increased from 41.8% in 2013-2017 to 60.9% in 2018-2022. Viridans streptococcus showed an antibiotic sensitivity of 80.5% to ampicillin; the sensitivity to penicillin antibiotics decreased over the study period. Antibiotic susceptibility was approximately 94% for third-generation cephalosporins. K. pneumoniae, which was identified at a high percentage in patients with deep neck space infection, showed increasing antibiotic resistance to most antibiotics over the study period. Conclusion: Viridans streptococcus was identified in head and neck fascial space abscesses with the highest frequency. Empirical antibiotics should be effective against this strain; penicillin antibiotics are considered inappropriate. For effective treatment of deep neck space abscesses, bacterial culture and antibiotic sensitivity tests performed as soon as possible are essential.

• 생명과학회지
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• 제15권6호
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• pp.863-870
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• 2005

2002년 2월부터 2005년 4월까지 호흡기질환 환자로부터 분리된 M. pneumeniae 123 균주의 tetracycline과 erythromycin에 대한 MIC 범위는 각각 $0.5\~1.0$, and $0.5\~512{\mu}/ml$ 이었다. 분리된 M. pneumoniae 123 균주에서 plasmid DNA는 확인되지 않았다. 분리된 M. pneumoniae 123 균주 중에서 57($46.3\%$) 균주가 tetracycline에 저항성인 tetM유전자를 가지고 있었으며, 235 rRNA domain V에 erythromycin에 저항성 변이를 일으킨 균주가 60($48.8\%$)이었다. erythromycin에 저항성 변이를 일으키지 않은 63균주 중에서 tetM 유전자를 가지고 있는 균주는 36($57.1\%$)이었으며, erythromycin에 저항성 변이를 일으킨 60균주 중에서 21($35.0\%$ 균주가 tetM 유전자를 가지고 있었다. 본 연구로써 국내에서 tetracycline과 erythromycin에 대한 저항성 M. pneumoniae 균주의 분리율이 외국에 비하여 높으며, M. pneumoniae 감염의 치료에 erythromycin이 일차 선택제가 될 수 없으므로 이에 대한 범국가적 조사가 필요하다고 생각된다.

• Tuberculosis and Respiratory Diseases
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• 제57권5호
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• pp.405-410
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• 2004

배 경 : 현재 moxifloxacin은 기존의 quinolone 제제들에 비하여 항결핵효과가 크다고 알려지면서 다제내성 결핵에 많이 사용되어 왔지만 moxifloxacin과 기존의 quinolone간의 교차내성에 대한 보고가 없는 상황에서 기존의 quinolone에 내성인 균주에 대한 moxifloxacin의 효과를 예측하기 어려웠다. 이에 본 연구를 통하여 moxifloxacin과 ofloxacin간의 교차내성을 알아봄으로써 ofloxacin 내성 균주에 대한 moxifloxacin의 항 결핵 효과를 알아보고자 하였다. 방 법 : 2003년 3월부터 2004년 3월까지 폐결핵 치료를 위해서 국립마산병원에 방문 또는 입원하였던 환자들의 객담에서 분리된 M. tuberculosis isolate에 대한 약물감수성 검사상 ofloxacin에 대한 본원 임상 검사실의 내성기준 농도인 $2.5{\mu}g/m{\ell}$의 농도에 내성을 보인 균주 37개와 감성을 보인 균주 16개를 대상으로 하여 ofloxacin 및 moxifloxacin 각각에 대한 MIC를 비례법을 이용하여 조사하였다. 결 과 : Ofloxaicn 감성균주들에 대한 $MIC_{50}$과 $MIC_{90}$은 ofloxacin에서 모두 $1.25{\mu}g/m{\ell}$, moxifloxacin에서는 각각 $0.31{\mu}g/m{\ell}$과 $0.63{\mu}g/m{\ell}$였다. ofloxacin 내성균주들에 대한 $MIC_{50}$은 ofloxacin에서 $10{\mu}g/m{\ell}$ 이상, moxifloxacin에서 $5{\mu}g/m{\ell}$였으며 $MIC_{90}$은 ofloxacin과 moxifloxacin 모두에서 $10{\mu}g/m{\ell}$이상의 값을 보였다. 약물 농도 $2.5{\mu}g/m{\ell}$을 기준으로 한 moxifloxacin의 ofloxacin에 대한 교차 내성률은 67.6%로 나타났다. 결 론 : moxifloxacin은 $10{\mu}g/m{\ell}$의 농도에서 ofloxacin 내성균주의 82.4%(28/34)에서 항결핵 효과가 있었으나 ofloxacin 내성을 포함하는 다제내성 결핵환자에게 사용하기 위해서 좀 더 많은 연구가 필요할 것으로 사료된다.