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납 , 수은 및 카드뮴이 백서 좌골신경에 미치는 영향에 관한 형태학적 연구
정종훈,문연자,문철성,유태전,최민규,정연태 ( Chong Hoon Chung,Yeun Ja Mun,Chul Sung Moon,Tae Jeon Yoo,Min Kyu Choi,Yeun Tai Chung ) 한국환경생물학회 1991 환경생물 : 환경생물학회지 Vol.9 No.2
In order to evaluate the effect of some heavy metals on the sciatic nerve of the rat, light and electron microscopic studies were performed to examine the fine structural changes of sciatic nerve of the rat after administration of lead nitrate, mercuric chloride and cadmium chloride, respectively. Rats were received 200㎎/ℓ of each heavy metal(Pb, Hg and Cd) solution ad libitum for 3 months and then, they were sacrificed. The results were summarized as follows; 1. Lead nitrate-treated group showed the decreased diameter of nerve fibers and axons, and mercuric chloride-treated group showed the decrement of number of nerve fibers per unit area, remarkably. 2. g ratio (d/D) measured in the heavy metal-treated groups were 0.75 in Pb, 0.82 in Hg and 0.85 in Cd respectively, compared to the 0.78 in control group. 3. Electron microscopy of lead nitrate-treated group showed the degeneration of myelin sheath, and the destructive change of membrane of Schwann cell. 4. The severe degeneration of myelin sheath and vacuoles in axon were observed in mercuric chloride-treated group. 5. In cadmium chloride-treated group, the degeneration of myelin sheath and axon, and Schwann cell were observed. 6. Degenerative changes of axon were highest in cadmium chloride-treated group(7.4%) and also those of myelin sheath were highest in mercuric chloride-treated group(23.7%) among the experimental groups. These findings indicate that lead, mercury and cadmium produce the morphological changes in the diameters of nerve fiber and axon, and thickness of myelin sheath of sciatic nerve.
허혈이 유발된 흰쥐 해마에서 Norepinephrine 유리에 미치는 Adenosine 수용체의 역할
정종훈,최봉규,Chung, Jong-Hoon,Choi, Bong-Kyu 대한약리학회 1996 대한약리학잡지 Vol.32 No.2
The effects of adenosine analogues on the electrically-evoked norepinephrine(NE) release and the influence of ischemia on the effects were studied in the rat hippocampus. Slices from the rat hippocampus were equilibrated with $0.1{\mu}M$ $[^3H]-norepinephrine$ and the release of the labelled product, $[^3H]-NE$, was evoked by electrical stimulation(3 Hz, 2 ms, 5 $VCm^{-1}$ and rectangular pulses for 90 sec), and the influence of various agents on the evoked tritium-outflow was investigated. Ischemia(15min with 95% $N_2$ +5% $CO_2$) increased both the basal and evoked NE release. These increases were abolished by addition of glucose into the superfused medium, and they were significantly inhibited either by $0.3\;{\mu}M$ tetrodotoxin pretreatment or by removing $Ca^{++}$ in the medium. MK-801$(1{sim}10\;{\mu}M)$, a specific NMDA receptor antagonist, and glibenclamide $(1\;{\mu}M)$, a $K^+-channel$ inhibitor, neither alter the evoked NE release nor affected the Ischemia-Induced increases in NE release. However, polymyxin B(0.03 mg), a specific protein kinase C inhibitor, inhibited the effect of ischemia on the evoked NE release. Adenosine and $N^6-cyclopentyladenosine$ decreased the NE release in a dose-dependent manner in ischemic condition, though the magnitude of inhibition was far less than those in normal (normoxic) condition. Also the treatment with $5{\mu}M$ DPCPX, a potent $A_1-adenosine$ receptor antagonist did not affect the ischemia-effect. These results suggest that the evoked-NE release is potentiated by ischemia, and this process being most probably mediated by protein kinase C, and that the decrease of NE release mediated through $A_1-adenosine$ receptor is significantly inhibited in ischemic state.
Simulation of Silo System for Drying and Storage of Grains
정종훈,Chung, J.H. 한국농업기계학회 1994 바이오시스템공학 Vol.19 No.3
미곡종합처리장(米穀綜合處理場)의 곡물 건조 및 저장시설의 적정 설계를 위해서 시뮬레이션 모델링이 요구되었다. 이에 곡물 건조 및 저장시설인 곡물 사일로 시스템을 설계하기 위해서 SLAMSYSTEM을 이용한 시뮬레이션 모델을 개발(開發)하였다. 곡물 사일로 시스템은 반입(搬入)장치, 조선(粗選)장치, 계량(計量)장치, 건조용(乾燥用) 사일로, 저장용(貯藏用) 사일로 그리고 이송장치들로 구성되었으며 이들 장치와 시스템의 공정들이 네트웍(network)과 프로세스(process) 중심의 시뮬레이션 모델로 표현(表現)되어 분석(分析)되었다. 이 시뮬레이션 모델로 1) 각 공정에서의 원료 처리시간 및 대기시간 그리고 병목현상, 2) 각 기계 및 장치들의 활용도(活用度) 및 이용상태(利用狀態), 3) 물벼의 처리용량 및 건조조건에 따른 건조시간과 건조에 소요되는 에너지 그리고 건조중 발생되는 열손실(熱損失), 4) 반입에서부터 저장에 도달할 때까지의 총 처리시간 및 처리량 등을 분석하였다. 이러한 시뮬레이션 결과 자료를 기초로 하여 각 기계 및 장치의 종류(種類)와 용량(容量) 및 크기를 결정하여 곡물 사일로 시스템을 설계(設計)하였다. 그리고 시뮬레이션에 의해 설계된 사일로 시스템이 실제로 전북 남원에 설치(設置)되었다.