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백지현,박은영,정윤숙,홍재원,채윤태,진성준,최희경,신소연,한상훈,진범식,김창오,최준용,송영구,조남훈,김준명 대한감염학회 2009 감염과 화학요법 Vol.41 No.4
Coccidioidomycosis is a fungal infection that results from inhaling the airborne arthroconidia of the Coccidioides species. It is an endemic disease in the southwest part of North America and rarely diagnosed in Korea. As tourism to endemic areas and the number of immunocompromised patients have been increasing, the incidence of this infection has increased in non-endemic areas. Treatment is usually successful with antifungal agents; however, recurrence is common. It is difficult to decide when to discontinue the antifungal treatment especially in non-endemic areas where doctors are not familiar with the disease. We report a case of recurrent coccidioidomycosis manifesting as osteomyelitis after the treatment of the patient for disseminated coccidioidal infection. The complement fixation test was a useful tool for the assessment of patient response and to evaluate suspected recurrence.
주지현,최정현,이동건,백지연,고윤호,이혜정,김세희,신호진,박윤희,박지영,김유진,신완식,김춘추 대한감염학회 2001 감염 Vol.33 No.4
Background : Pneumocytitis cainii pneumonia (PCP) can occur in immunocompromised hosts especially such as AIDS or cancer patients. Although recent research had focused on PCP in AIDS patients, few studies have described the clinical presentations of PCP in recipients of stem cell transplantation (SCT). We evaluated the clinical manifestations of PCP in SCT patients admitted at St. Mary's hospital, Seoul, Korea. Methods : The medical records of 17 PCP patients undergoing SCT between Feb. 1998 and Feb. 2000 were reviewed. The diagnosis of PCP was confirmed through the demonstration of Pneumocytitis cainii via either cytology of brochoalveolar lavage (BAL) or histological technique of lung biopsy. CMV disease and CMV infection were confirmed by BAL culture and antigenemia respectively . Results : Seventeen patients were all recipients of allogeneic SCT and 7 of 17 patients were performed non-sibling SCT. Patients presented with symptoms including brief period (4 ∼23 days) of fever (76%), dyspnea (70%), cough (64%), and signs such as rare(58.8%), Sixteen patients (94%) had been receiving immunosuppressive agent such as cyclosporine A (64%) or Fk506 (35%) without PCP prophylaxis. Eleven patients (64%) were treated with corticosteroid with mean dose of 16 mg/day prednisolone and mean duration of 4.6 months after post-SCT period. Twelve patients were co-infected with CMV. Another co-infected miCroorganisms were Pseudomonas aeruginosa, Mycobacterium tuberculosis, herpes simplex virus, parainfluenza virus, Average duration of treatment with trimethoprim-sulfamethoxazole (TMP/SMX) was 21 ±9 days. Four patients died, and three of them were related with PCP. Conclusion : PCP developed frequently in patients who were taking immunosuppressive drug due to graft versus host disease or were not taking TMP/SMX prophylaxis. High risk patients showing fever, cough, or dyspnea should be considered to take early bronchoscopic intervention for detection of PCP. When treat for PCP, it also be considered to the possibility of coinfection such as CMV. (Korean J Infect Dis 33:273∼279, 2001)
Ji-eun KWON,Sung-Huyn JO,Jae-Seung LEE,Hyo-Jin JEON,Ji-Hyeon PARK,Ye-Rim KIM,Min-Gyu KIM,Ji-Hyun BAEK,Yun-Gon KIM 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Clostridioides difficile is a gram-positive bacterium and is considered as an enteric pathogen. C. difficile colonizes the host with intestinal dysbiosis and produces virulence factors, Toxin A and B. Although the cytotoxicity of C. difficile has been well elucidated, the exact pathogenic mechanisms and biological pathways of C. difficile infection (CDI) are not yet clear. Here, we developed a CDI model using MIMICS to investigate C. difficile-host interactions throughout the early (12 hr) and later (48 hr) stages of infection. We also apply an LC-MS/MS-based multi-omics approach to study the physiological changes in CDI-induced gut epithelial cells at the molecular and cellular levels. The proteomic analysis confirmed that proteins involved in cellular responses such as stress, immune responses and DNA damage responses are upregulated at early stages of infection. In addition, a representative CDI phenotype has been identified in the late stage of the infection. Our in vitro CDI model and multi-omics approach not only provide a better understanding of host-anaerobic pathogen interactions but may also aid in the treatment of C. difficile and other anaerobic infections.
Ji-Hyeon PARK,Sung-Hyun JO,Jae-Seung LEE,Hyo-Jin JEON,Ji-Eun KWON,Ye-Rim KIM,Ji-Hyun BAEK,Min-Gyu KIM,Yun-Gon KIM 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
The human gut commensal bacteria Faecalibacterium prausnitzii is well known for its anti-inflammatory effects that improve host intestinal health. Although several studies reported that inulin, one of the well-known prebiotics, increases the abundance of F. prausnitzii in the intestine, the mechanism under this effect of inulin remains unclear. Here, we applied LC-MS/MS-based multi-omics approaches to confirm the effects of inulin on F. prausnitzii. Interestingly, the proteomic analysis revealed that the putative proteins involved in sucrose utilization of F. prausnitzii are upregulated in the presence of inulin. To investigate the function of the proteins, we cloned the target genes, and observed the ability for sucrose degradation. In addition, we demonstrated that the sucrose degradation activity in F. prausnitzii culture media is enhanced by using inulin as a carbon source compared to glucose. Taken together, this study suggests that the reduction of sucrose induced by inulin could potentially improve host health and prevent gut dysbiosis like type 2 diabetes which is associated with sucrose.
Seroprevalence of hepatitis A virus (HAV) infection in the Korean HIV-positive persons (초)
( Ji Hyeon Baek ),( Nam Soo Koo ),( Sung Jun Jin ),( Yun Tae Chae ),( Sung Joon Jin ),( Bum Sik Chin ),( Sang Hoon Han ),( Chang Oh Kim ),( Jun Yong Choi ),( Young Goo Song ),( June Myung Kim ) 대한내과학회 2010 대한내과학회 추계학술발표논문집 Vol.2010 No.-
Antibody response to pneumococcal vaccination in children with chronic or recurrent rhinosinusitis
Baek, Ji Hyeon,Seo, Hyun Kyong,Jee, Hye Mi,Shin, Youn Ho,Han, Man Yong,Oh, Eun Sang,Lee, Hyun Ju,Kim, Kyung Hyo The Korean Pediatric Society 2013 Clinical and Experimental Pediatrics (CEP) Vol.56 No.7
Purpose: Although chronic and recurrent rhinosinusitis is prevalent in children, little is known about its causes. Here, we investigated the humoral immunity in children with chronic or recurrent rhinosinusitis. Methods: We examined 16 children attending the outpatient clinic at the CHA Bundang Medical Center including 11 boys and 5 girls, aged 3-11 years (mean age, 5.6 years), who had rhinosinusitis for >3 months or >3 times per year. The complete blood count with differential and total serum concentrations of Immunoglobulin (Ig) E, IgA, IgD, IgM, IgG, and IgG subclasses ($IgG_1$, $IgG_2$, $IgG_3$, and $IgG_4$) of all children were measured. All subjects received 23-polysaccharide pneumococcal vaccination (PPV), and the levels of antibodies to 5 serologic types (4, 6B, 14, 18C, and 23F) of pneumococcal capsular polysaccharide antigens were measured before and after vaccination. Post-PPV antibody titers ${\geq}0.35{\mu}g/mL$ or with a ${\geq}4$-fold increase were considered as positive responses. Results: The titers of IgG, IgA, IgD, and IgM were within normal range in all 16 children, whereas the total IgE concentration was higher than normal in 2 children. $IgG_1$ deficiency was observed in 1 patient and $IgG_3$ deficiency in 3. After PPV, 1 patient failed to respond to all 5 serologic types, 2 failed to respond to 4 serologic types, and 2 failed to respond to 3 serologic types. Conclusion: Clinicians should consider the evaluation of humoral immune functions in children with chronic or recurrent rhinosinusitis who do not respond to prolonged antibiotic treatment.
UV-illuminated chemical bath deposition of CdS buffer layer for CIGSSe solar cells
Hyeon-ji Baek,Ji A. Oh,Young-Eun Seo,Hye-Jin Shin,Sung-Wook Cho,Chan-Wook Jeon 한국물리학회 2020 Current Applied Physics Vol.20 No.1
In this paper, we compare the performance of Cu(In,Ga)(S,Se)2 (CIGSSe) thin film solar cells with a CdS buffer layer grown by chemical bath deposition (CBD) with UV irradiation of 365 nm or 254 nm at an output power of 8 W. The effects of UV light irradiation on the CBD-CdS thin film deposition mechanism were investigated through chemical and electro-optical studies. UV light irradiation during the solution process promotes the hydrolysis of thiourea, thereby inhibiting the formation of the intermediate products being developed on the reaction pathways and decreasing the solution pH. Therefore, the efficiency of the CdS/CIGSSe solar cells was improved because of the increased elemental ratio of S/(S + O) in the CdS thin film. This very simple and effective approach can be used to control the S/O ratio of the CdS thin film fabricated by the CBD process without artificially controlling the process temperature, solution pH or concentration.
컨테이너 기반 웹 VDI 시스템에서 군집 분석을 통한 사용자 워크로드 맞춤형 자원 할당 방법 연구
백현지 ( Hyeon-ji Baek ),허의남 ( Eui-nam Huh ) 한국정보처리학회 2017 한국정보처리학회 학술대회논문집 Vol.24 No.1
클라우드 컴퓨팅 시장의 지속적 성장과 가상화의 인기로 세계적 VID 시장은 꾸준한 성장률을 보이고 있다. 또한 의료, 교육, 금융 등의 폭넓은 분야에서 VID 서비스가 활용될 전망이다. 하지만 기존 VID 서비스는 고정적인 자원 할당으로 사용자 워크로드 맞춤형 자원이 제공되지 못하는 문제점이 있다. 따라서 본 논문에서는 기존 VID 에 비해 실행속도가 빠른 컨테이너의 장점을 살려 VID 를 컨테이너화 하고, 사용자 워크로드 맞춤형으로 자원을 분배하기 위해 VID 컨테이너의 자원 사용량 데이터로 K-means 알고리즘을 통한 군집 분석 기반의 워크로드 분류 방법을 제시하였다.