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백서 좌골신경의 동종이식후 조직반응에 관한 실험적 연구
정형배,임창준,이동근,김수남 원광대학교 치의학연구소 1990 圓光齒醫學 Vol.1 No.1
Nerve allografts as a bridge through which lost nerve can regenerate is useful in the repair of peripheral nerve defect resulting from trauma, and leprosy. But immunological rejection and complicated scar formation is an unavoidable problem in the application of allogenic nerves. This article is intended to study of the regeneration of allogenic nerve grafts in rats with histopathologically, scanning electron microscopically. 24 adult male Sprage-Dawley rats were used as the experimental animals. A 2㎝ skin incision was made on the lateral aspects of limb, parallel to femur. Segemnts of sciatic nerve trunk taken from rats, 10㎜ was resected at the middle of the thigh, nerve graft was inserted between the ends of gaps with perineural and epineural suture method with 10-0 prolene. Obsrevation was made simultaneous at 3 day, 1, 2, 3, 4, 6, 8 weeks after surgery. The results were as follows. 1. In light and electronic microscopic studies, marked degenerative change of the graft nerves were observed at 2 weeks after surgery. 2. After surgery, blood clot fromation was observed at 3 day, granualtion tissue formation was observed at 2 week & fibrous tissue proliferation was observed at 3 week. 3. In change of nerve fiber, there were wallerian degeneration at early stage, decrease in degeneration at 4 week and degeneration of myeline was continuded at 8 week. 4. At 4 week, schwann cells proliferate at its cut ends to join with the distal and proximal stump of the damaged nerve. 5. Fibrous scar tissues are formated at 2 weeks and increased progressively in 8 weeks, which was interrupted the regeneration of grafted nerve.
양형재(Hyung Jae Yang),신응배(Eung Bai Shin),정윤철(Yun Chul Chung),이재운(Jae Woon Lee) 한국물환경학회 1999 한국물환경학회지 Vol.15 No.1
A bench-scale reactor using SBR process was experimented with a synthetic wastewater. The main purpose of this investigation was to evaluate applicability in the field and process removal efficiencies in terms of BOD and T-N, and its corresponding kinetic parameters. Removal rate of nitrogen was 71% in terms of total nitrogen. Effluent concentrations were 9.8㎎/ℓ BOD and 11.2㎎/ℓ T-N, and was maintained consistently stable concentration by controlling decant volume and operating cycles. During the anaerobic phase, corresponding to the end of denitrification, the pH profile shows a maximum due to the alkalinity production during the reactions. And during the aerobic phase, the pH shows a rapid increase due to the CO₂ stripping and pH starts to increase again when ammonia nitrogen reaches the minimum level. Microscopic examination revealed that microcytes observed predominantly in sludge were Vorticella, Epistilis, Opercularia, Aspidisca, Chilodonella that are protozoa and Philodina, Rotaria, Notommata, Nematoda that are rotatoria
양형재(Hyung Jae Yang),신웅배(Eung Bai Shin),정윤철(Yun Chul Chung),최훈근(Hun Geun Choi) 한국물환경학회 2000 한국물환경학회지 Vol.16 No.4
A bench-scale reactor using SBR process was experimented with an synthetic wastewater. The main purpose of this investigation was to evaluate applicability in the field and process removal efficiencies in terms of BOD and T-P and its corresponding kinetic parameters. Removal rate of phosphorus was 77% in terms of total phosphorus. Effluent concentrations were 9.8㎎/ℓ BOD and 1.1㎎/ℓ T-P. Effluent quality was maintained consistently stable by controlling decant volume and operating cycles. The efficiency for phosphorus removal was increased due to decrease in BOD-SS loading value in the range of 0.25≤aeration time ratio ≤0.52.
김배영(Bai Young Kim),김효종(Hyo Jong Kim),정형근(Hyung Keun Chung),김영관(Young Kwan Kim),동석호(Seok Ho Dong),김병호(Byung Ho Kim),이정일(Jung Il Lee),장영운(Young Woon Chang),장린(Rin Chang) 대한내과학회 1993 대한내과학회지 Vol.45 No.5
Background: According to the rapid changes in social environment such as increasing alcohol consumption and the marked improvement in diagnostic technique, we expect that there have been major changes in various aspects of acute pancreatitis during the recent 12 years in Korea. Methods: The medical records of 317 patients with acute pancreatitis diagnosed from 1980 through 1992 were reviewed about clinical, laboratory and radiological findings in the three different time period. Results: 1) There has been an increasing incidence in male sex about three folds. 2) There has been an increasing trends in the duration of hospitalization. 3) A significant increase was observed in the proportion of patients with alcoholic pancreatitis in the three different time period; 26.9%, 45.7%, 50.7% respectively. 4) The complication rates have been slightly increased in the three different time period; 46.3%, 47.1%, 59.1% respectively. But, the type of complications has not been changed. 5) There is increasing severity in non-gallstone group, but no significant differences in gallstone group. There is a declining trends in the number of patients with muld severity index, but increasing trend in the number of patients with moderate severity index in non-gallstone group. 6) There was no significant differences in mortality rate. Conclusions: There has been major changes in the etiology ans severity of acute pancreatitis from 1980 through 1992. Especially, significant increase in the proportion of patients with alcoholic pancreatitis was observed in the three differnt time period. These results might be due to socioeconomic changes.
백서 좌골신경의 동종이식후 조직반응에 관한 실험적 연구
정형배,임창준,이동근,서재덕,Chung, Hyung-Bai,Yim, Chang-Joon,Lee, Dong-Keun,Se, Jae-Deok 대한악안면성형재건외과학회 1991 Maxillofacial Plastic Reconstructive Surgery Vol.13 No.2
Nerve allografts as a bridge of regeneration is useful in the repair of peripheral nerve defect resulting from trauma, and leprosy. But immunological rejection and complicated scar formation is an unavoidable problem in the application of allogeneic nerves. This article is intended to study of the regeneration of allogeneic nerve grafts in rats with histopathologically, scanning electron microscopically. 24 adult male Sprague-Dawley rats were used as the experimental animals. A 2cm skin incision was made on the lateral aspects of limb, parallel to femur. Segments of sciatic nerve trunk taken from rats, 10mm was resected at the middle of the thigh, nerve graft was inserted between the ends of gaps with perineural and epineural suture method with 10-0 prolene. Obsrevation was made simultaneously at 3 day, 1, 2, 3, 4, 5, 6, 8 weeks after surgery. The results were as follows. 1. In light and electronic microscopic studies, marked degenerative change of the graft nerves were observed at 2 weeks after surgery. 2. After surgery, blood clot fromation was observed at 3 day, granualtion tissue formation was observed at 2 week, and fibrous tissue proliferation was observed at 3 week. 3. In change of nerve fiber, there were Wallerian degeneration at early stage, decrease in degeneration at 4 week but degeneration of myeline was continuded at 8 week. 4. At 4 week, schwann cells proliferate at its cut ends to join with the distal and proximal stump of the damaged nerve. 5. Fibrous scar tissues are formed at 2 weeks and increased progressively in 8 weeks, which was interrupted the regeneration of grafted nerve.
CASES REPORT OF CLEFT ALVEOLUS REPAIR WITH PMCB GRAFT
Lee, Dong-Keun,Chung, Hyung-Bai,Choi, Seong-Hoon 大韓顎顔面成形再建外科學會 1991 Maxillofacial Plastic Reconstructive Surgery Vol.13 No.1
치조골 파열은 전체 구개파열 환자의 약75% 정도 발생하며 발생원인은 유전적 요인이 강하며 환경적 요인으로 모체의 영양장애, 방사선조사, 스테로이드투여, 저산소증, 양수변화 바이러스에 의한 질환등을 들 수 있다. 치조골 파열시 상악골의 전후방관계의 전방골결손 및 수평관계의 후방골결손, 인접치아에 대한 골지지력 결여, 측절치의 조기결손, 그리고 안모의 외형에도 많은 변화를 줄 수 있다. 치조골 파열에 대한 골이식은 치조골을 안정시키고, 치조골의 연속성 도모 및 인접치아에 대한 골지지와 치아상실 예방 및 비익저부를 제공하는데 그 목적이 있다. 골이식은 시기에 따라 2세미만에 실시하는 일차 골이식술, 2세에서 5세사이에 시술하는 조기 이차 골 이식골, 5세에서 16세 사이에 실시하는 이차 골 이식술, 그리고 16세 이후에 실시하는 말기 이차골 이식술 등이 있으며 이중 혼합치열기인 5세에서 16세 사이에 실시하는 이차골 이식술이 가장 성공률이 높은 것으로 알려져 있다. 본 교실에서는 치조골 파열환자에 자가망상골을 이용한 골이식술을 시행하여 비교적 양호한 결과를 얻었기에 이에 보고하는 바이다. The cleft alveolus occurs about 75% of cleft lip and palate patients. The purpose of bone grafting is improve the maxillary growth, rehabilitation of continuty of maxillary arch and providing bone for periodontal support for unerupted teeth. The bone grafting for alveolar cleft defect repair are classsified; primary bone grafting, early secondary bone grafting secondary bone grafting and late secondary bone grafting. In this article, we reported the cases of PMCB grafts for repair of the alveolar clefts showed potential benifit to the patient to induce a normal maxillary growth and providing bone foor periodontal support of unerupted teeth.
( Seong Jin Choi ),( Joon Hyung Sohn ),( Kyoung-hee Han ),( Eun Young Park ),( Jieun Kang ),( In-bai Chung ) 대한주산의학회 2018 Perinatology Vol.29 No.4
Objective: Progesterone is used to prevent recurrent preterm delivery, however the molecular mechanisms of its effect are incompletely understood. The objective of this study was to determine the effect of progesterone on tumor necrosis factor (TNF)-α-induced matrix metalloproteinase (MMP)-9 activity in human choriodecidual (CD) membranes. Methods: We collected CD membranes from women with uncomplicated term pregnancies who were scheduled for elective cesarean delivery (n=10). CD membranes (1×1 cm) were incubated in tissue culture media at 37°C. We pre-treated the CD membranes with progesterone (P4), 17α- hydroxyprogesterone caproate (17P), promegestone (R5020), or vehicle (ethanol) for 24 hours. The CD membranes were subsequently treated with TNF-α (with continued progesterone treatment) for 48 hours, then media was harvested for measuring MMP-9 activity by zymography and total protein was isolated from CD membrane tissues for MMP-9 expression by western blot analysis. Results: P4, 17P, and R5020 significantly reduced TNF-α-induced MMP-9 activity in fetal membrane tissue samples (P=0.0078, P=0.0156, and P=0.0391, respectively) by zymography. Western blot analysis also showed decreased expression of MMP-9 in progesterone pretreated groups (P=0.0313). Conclusion: Progesterone reduces TNF-α-induced MMP-9 activity in human CD membranes. These findings may provide further support for the role of progesterone in preventing preterm birth.
한국과학재단의 농수산분야 기초연구지원 추이분석을 통한 연구활동지원 활성화 제언
민태선 ( Tae Sun Min ),최형균 ( Hyung Kyoon Choi ),김성용 ( Seong Yong Kim ),배승철 ( Sung Chul C. Bai ),김유용 ( Yoo Yong Kim ),양문식 ( Moon Sik Yang ),정봉현 ( Bong Hyun Chung ),황준영 ( Joon Young Hwang ),한인규 ( In Kyu Ha 한국응용생명화학회(구 한국농화학회) 2005 Applied Biological Chemistry (Appl Biol Chem) Vol.48 No.1