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위험 요인이 없는 젊은 여성에서 발생한 육종양 간세포암 1예
남효성 ( Hyo Sung Nam ),김해경 ( Hae Kyung Kim ),마세웅 ( Sae Ung Ma ),유병현 ( Byung Hyun Yu ),정기명 ( Ki Myung Jung ),공경택 ( Kyung Taek Gong ),이용주 ( Yong Ju Lee ),박태일 ( Tae Il Park ),허병원 ( Byung Won Hu ),박신희 ( Shi 대한소화기학회 2006 대한소화기학회지 Vol.47 No.6
A previously healthy 22-year-old woman was admitted with a complaint of right upper quadrant abdominal pain for 2 weeks. Her past history was not remarkable. On admission, HBsAg and anti-HCV were negative and a-FP was within normal range. Abdominal sonography and CT showed a mass in Liver measuring 10×11 cm with features of central necrosis and hemorrhage. On 6th hospital day, hemoperitoneum developed suddenly. She underwent emergency Laparotomy and trisegmentectomy. Intraoperative finding revealed a hemoperitoneum with a tumor filled with liquefied necrotic tissues. Microscopically, the tumor was mostly composed of pleomorphic spindle cells with abundant anastomosing vascular channels and partly composed of tumor cells with trabecular arrangement. On immunohistochemical staining, tumor cells reacted with cytokeratin and vimentin, while CD34 and hepatocyte staining revealed negative. She died 2 months after the operation. We report a case of rapidly deteriorated primary sarcomatoid hepatocellular carcinoma in a young female without any risk factor. (Korean J Gastroenterol 2006;47:458-462)
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.
Gd2O3 나노입자 장식이 GdBCO 박막의 자속꽂음 특성에 미치는 영향
강병원,D. H. Tran,이남훈,강원남 한국물리학회 2013 새물리 Vol.63 No.5
We investigated the effect of substrate surface decoration on the flux-pinning property of GdBCO thin films. Gd2O3 nanoparticles were uniformly deposited on a SrTiO3 substrate parallel to the ab-plane of the substrate by using a pulsed laser ablation technique. The density of Gd2O3 nanoparticles was controlled by varying the number of laser pulses used, and YBCO superconducting layers with a total thickness of 300 nm were deposited on top of the Gd2O3 nanoparticles. We found that compared to the pure GdBCO thin films, the critical current density was enhanced when GdBCO thin films were deposited on top of the Gd2O3 nanoparticles. The enhanced critical current density may be attributed to the fact that both the nanoparticles located at the film/substrate interface and the induced linear nanorods around the nanoparticles, which were confirmed by the TEM analysis, served as effective pinning centers. 기판 표면의 장식 (decoration)이 GdBa2Cu3O7−x (GdBCO)박막의 자속꽂음 특성에 미치는 영향에 대해 연구하였다. Pulsed Laser Deposition (PLD) 방법을 이용하여 SrTiO3 (STO) 기판위에 ab−면방향으로 성장한 Gd2O3 나노입자를 균일하게 첨가하였다. 레이저펄스수를 조절하여 Gd2O3 나노입자의 밀도를 조절하였고 그 위에GdBCO 초전도 층을 박막 두께가 300 nm 가 되도록 증착하였다. Gd2O3 나노입자가 장식된 기판위에 증착된 GdBCO 박막의 경우순수한 GdBCO 박막에 비해 자기장내에서의 임계전류밀도가 증가하는 것을관찰하였다. 이는 기판과 초전도 박막의 경계에 위치한 것으로주사현미경 (Transmission electron mucroscope)을 통해 확인된나노입자와 나노입자 주변에 유도된 선형 결함들이 효과적인 자속꽂음중심으로 작용하기 때문인 것으로 여겨진다.