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최우봉(Woo Bong Choi),이태영(Tae Young Lee),이낙원(Nak Weon Lee),정일권(Il Kwun Chung),김홍수(Hong Soo Kim),박상흠(Sang Hum Park),이문호(Mun Ho Lee),김선주(Sun Joo Kim),김대중(Dae Jung Kim) 대한내과학회 1997 대한내과학회지 Vol.53 No.6
Carcinoma of the gallbladder is relatively rare malignancy usually found in an elderly, predominantly female population. Histologically, adenocarcinoma predominate, with only 10% to 15% being of other varieties(small cell carcinoma and others). Small cell carcinoma of the gallbladder is a rare lesion and predominantly a disease of older women with clinical history of stones. These tumors show an aggressive clinical course and death usually occurs with in a few months of the diagnosis. The diagnosis of small cell carcinoma should be based on cell morphology, histologic pattern and immunohistochemical study. Correct diagnosis is important not only because these tumors give rise to endocrine syndromes, but also because the chemotherapeutic approach to small cell carcinoma differs from that for adenocarcinoma.
고온.내산성 Bacillus sp. SJ-15를 이용한 음식물 쓰레기의 호기적 퇴비화
김춘희,남수완,최우봉,이종환,강병원,김회수,전숭종,Kim, Choon-Hee,Nam, Soo-Wan,Choi, Woo-Bong,Lee, Jong-Hwan,Kang, Byoung-Won,Kim, Hweh-Su,Jeon, Sung-Jong 한국생명과학회 2007 생명과학회지 Vol.17 No.5
고온 내산성 미생물을 퇴비에서 분리하고, 생리 및 생화학적 특성을 조사하여 Bacillus sp. SJ-15로 명명하였다. 생장을 위한 최적 온도와 pH는 각각 $55^{\circ}C$와 5.0 이었다. 분리된 SJ-15 균주는 음식물쓰레기의 고온 고속 퇴비화 공정에 적용하였다. 퇴비화 과정에서 16시간 만에 최대 생균수인 $9.2{\times}10^9/ml$를 나타내었다. 본 퇴비화 공정은 개시 100일 후에 약 88%의 감량율을 나타내었고, 퇴비성분의 농도를 분석한 결과 본 공정을 통해 생산된 퇴비는 염분을 제외하면 유기질 비료의 기준을 모두 만족하는 것으로 나타났다. A thermoacidophilic bacterium was isolated from the compost and designated as Bacillus sp. SJ-15 by physiological and biochemical characteristics. The optimum temperature and pH for growth were at $55^{\circ}C$ and pH 5.0, respectively. The strain SJ-15 was adapted in process of accelerated high-temperature composting of garbage. The highest viable cell count of composting process reached to $9.2{\times}10^9/ml$ in 16 hours. After running times of 100 days, the composting process showed a reduction rate of approximately 88%, and the concentrations of components were sufficiently high or low to satisfied the standard of organic compost except for salinity.
박용순(Yong Soon Park),최우봉(Woo Bong Choi),함정식(Jung Sik Ham),장재영(Jae Young Jang),이영홍(Young Hong Lee),김진오(Jin Oh Kim),조영덕(Young Deok Cho),봉형근(Hyung Keun Bong),김연수(Yun Soo Kim),조주영(Joo Young Cho),이준성(Joon S 대한내과학회 1997 대한내과학회지 Vol.53 No.2
Objectives: To determine accurate diagnosis and proper treatment, we reviewed colonoscopic and histologic findings of flat adenoma of colon, Methods: We studied retrospectively 2148 cases of colonoscopic findings performed in our hospital from March of 1993 to September of 1995. Results: 1) The incidence of adenoma is 9.5%(203 cases), and that of flat adenoma is 1.6%(34 cases). 2) The location of flat adenoma is 3 cases in rectum(8.8%), 15 cases in sigmoid colon(44.1%), 9 cases in descending colon(26.5%), 3 cases in transverse colon(8.8%) and 4 cases in ascending colon and cecum(11.8%). 3) The diameter of flat adenoma was smaller than 5mm in 17 cases(50.0%), between 5-10mm in 8 cases(23.5%) and larger than 10mm in 9 cases (26.5%). Mean size was 9.2mm. 4) In colonoscopic features, type IIa was 25 cases (73.5%), type IIa + IIc was 5 cases(14.7%) and lateral spreading tumor was 4 cases(11.8%). 5) In histologic findings, tubular adenoma was 26 cases(76.5%), tubulovillous adenoma was 6 cases (17.6%) and serrated adenoma was 2 cases(5.9%). 6) The incidence of severe dysplasia or carcinoma was zero in smaller than 5mm, 25.0%(2 case) in 5-10mm and 55.6%(5 cases) in larger than 10mm. 7) The incidence of severe dysplasia or carcinoma was 11.5%(3 cases) in tubular adenoma and 66.7%(6 cases) in tubulovillous adenoma. 8) It was confirmed by abdominal CT scan or operation that lesions were limited to intraepithelium in 4 cases, mucosa in 2 cases submucosa in 1 case and no lymph node metastasis in any case. Conclusion: Even though flat adenoma of colon was smaller than polypoid adenoma, the incidence of malignant change was higher. When it was smaller than 10mm, the incidence of submucosal invasion or lymph node invasion was rare. Therefore endoscopic mucosal resection(EMR) can be the treatment of choice in flat adenoma smaller than 10mm, and after EMR, it is desirable to decide the treatment modality depending on the histologic findings.
김현철,김정현,전숭종,최우봉,남수완,Kim Hyun-Chul,Kim Jeong-Hyun,Jeon Sung-Jong,Choi Woo-Bong,Nam Soo-Wan 한국생명과학회 2005 생명과학회지 Vol.15 No.3
Paenibacillus macerans 유래의 cycloinulooligosaccharide fructanotransferase (CFTase) 유전자(cft)를 Saccharomyces cerevisiae SEY2102에 발현시키기 위해 대장균과 효모의 shuttle vector인 pYES2.0에 subcloning 하였다. 구축된 pYGECFTN (8.6 kb) plasmid를 S. cerevisiae SEY2102에 형질전환하였고, uracil이 결핍된 SD 배지에서 선별하였다. cft 유전자는 선별된 형질전환체(S. cerevisiae SEY2102/pYCECFTN)에서 GAL1 promoter 조절하에 성공적으로 발현되어 cyclofructan(CF)을 생성함을 TLC로 확인하였다. 그러나, 균체 외로의 효소 분비는 이루어지지 않았고 cytoplasm보다 periplasmic space에 많이 존재하였다 S. cerevisiae에서 발현된 P. polymyxa유래 CFTase보다 P. macerans 유래 CFTase의 CF 생성이 image analyzer로 확인한 결과, 더 많음을 알 수 있었다. 효소반응 5분째부터 CF가 생성됨을 확인하였고, 최적온도와 최적 pH는 각각 $45^{\circ}C$와 pH 8.0로 나타났으며, $55^{\circ}C$까지 효소활성이 안정적으로 유지되었다. Dahlia tubers, chicory root, Jerusalem artichoke 등의 inulin 기질에 따른 반응산물 분석 결과, 모든 기질로부터 CF가 생산되었으며, dahlia tubers와 Jerusalem artichoke로부터 가장 효과적으로 생성되었다. The cycloinulooligosaccharide fructanotransferase (CFTase) gene (cft) from Paenibacillus macerans was subcloned into an E. coli-yeast shuttle vector, pYES2.0, resulting in pYGECFTN. The plasmid pYGECFTN (8.6 kb) was introduced into Saccharomyces cerevisiae SEY2102 cells and then the transformants were selected on the synthetic defined media lacking uracil. The cft gene expression in yeast transformant was demonstrated by the analyses cyclofructan (CF) spots on thin-layer chromatogram. The recombinant CFTase was not secreted into the medium and localized in the periplasmic space. The production of CF was observed after 5 min of the enzymatic reaction with inulin. The optimun pH and temperature for CF production were found to be at pH 8.0 and $45^{\circ}C$, respectively. Enzyme activity was stably maintained up to $55^{\circ}C$. The CF was produced from all inulin sources and was most efficiently produced from dahlia tubers and Jerusalem artichokes.
급성 장 출혈로 발현된 원발성 분절성 회장 확장증 1 예
이낙원(Nak Weon Lee),최우봉(Woo Bong Choi),성재락(Jae Rak Sung),이태영(Tae Young Lee),황산(San Hwang),정일권(Il Kwun Chung),김홍수(Hong Soo Kim),박상흠(Sang Heum Park),이문호(Mun Ho Lee),김선주(Sun Joo Kim),김대중(Dae Jung Kim) 대한내과학회 1998 대한내과학회지 Vol.54 No.1
Idiopathic segmental ileal dilatation is a rare congenital condition in which the caliber of the bowel lumen increases locally without distal luminal obstruction or thickening of the muscle coats in involved lumen. Congenital abnormalities such as exomphalos, malrotation of the midgut, and Meckel's diverticulum are found frequently in the patients with segmental dilatation of the small bowel. Intermittent abdominal pain or anemia may be the symptoms of segmental dilatation of the small bowel in infants, children and occasionally adults. The radiologic finding in barium studies of the small bowel is characteristic axial segmental dilatation. The pathologic finding is nonspecific ulcer and mild congestion, but it has normal nervous system and smooth muscle bundle. There are no evidence of ischemic changes, inflammatory changes or neoplastic changes. The condition can be cured with surgical excision of the dilated segment. A case of idiopathic segmental ileal dilatation associated with melena and recurrent abdominal pain diagnosed by enteroclysis in a 47 years old man was presented with brief review of the literature.
13세 환아에서 발생한 장중첩증을 유발한 공장의 림프관종
박호성 ( Ho Sung Park ),이호 ( Ho Lee ),문우성 ( Woo Sung Moon ),이승찬 ( Seung Chan Lee ),최우봉 ( Woo Bong Choi ),최현웅 ( Hyun Woong Choi ) 대한소화기학회 2007 대한소화기학회지 Vol.49 No.4
Lymphangioma is a benign tumor composed of numerous small or large thin-walled lymphatic spaces. It shows a predilection for head, neck, and axilla. Jejunal lymphangioma in children is extremely rare. We present a case of 13-year-old girl with jejuno-jejunal intussusception secondary to lymphangioma in jejunum. To our knowledge, this is the second report of jejunal lymphangioma causing intussusception in a child. (Korean J Gastroenterol 2007;49:256-259)