• 대한금속재료학회지
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• 제48권2호
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• pp.133-140
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• 2010

10 nm thick Ni layers were deposited on 200 nm $SiO_2/Si$ substrates using an e-beam evaporator. Then, 60 nm or 20 nm thick ${\alpha}$-Si:H layers were grown at low temperature (<$200^{\circ}C$) by a Catalytic-CVD. NiSi layers were already formed instantaneously during Cat-CVD process regardless of the thickness of the $\alpha$-Si. The resulting changes in sheet resistance, microstructure, phase, chemical composition, and surface roughness with the additional rapid thermal annealing up to $500^{\circ}C$ were examined using a four point probe, HRXRD, FE-SEM, TEM, AES, and SPM, respectively. The sheet resistance of the NiSi layer was 12${\Omega}$/□ regardless of the thickness of the ${\alpha}$-Si and kept stable even after the additional annealing process. The thickness of the NiSi layer was 30 nm with excellent uniformity and the surface roughness was maintained under 2 nm after the annealing. Accordingly, our result implies that the low temperature Cat-CVD process with proposed films stack sequence may have more advantages than the conventional CVD process for nano scale NiSi applications.

• 한국임상수의학회지
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• 제24권2호
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• pp.214-217
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• 2007

약 2개월령(個月齡)의 잡종 암컷 고양이가 영창동물병원(永昌動物病院)에 내원하였다. 1차(次) 진료시(診療時) 우측 눈의 축동(縮瞳) 및 순막 돌출(瞬膜 突出)이 인정되었으며, 또한 좌측 눈의 경도의 축동이 인정되어, 본 환축(患畜)은 고양이 Horner's syndrome으로 진단(診斷)되었다. 본 환축(患畜)에 대하여 안침(眼針) (상초 영역(上焦 領域), 10분간(分間)) 및 dexamethasone 약침(藥鍼)(0.2 ml/혈위: BL 01-정명(睛明) BL02-찬죽(纘竹) 및 ST01-승읍(承泣))을 각각(各各) 실시(實施)하였다. 1차 치료 후, 축동(縮瞳) 및 순막돌출(瞬膜突出)이 놀랍게도 소실되었다. 2차 진료시(1차 치료 후 1일)확인 결과, 눈의 소견은 정상 상태를 유지하고 있었다. 따라서 본(本) 증례(症例)는 침치료(鍼治療)에 양호(良好)한 반응(反應)을 나타낸 고양이 Horner's syndrome의 증례(症例)였다.

• 한국임상수의학회지
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• 제16권1호
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• pp.31-36
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• 1999

The aim of this study is to determine the phagocytosis-promoting factor(s) for feline peripheral blood polymorphonuclear cells (PMN) by culture supernatant from mono-nuclear cells (MNC) treated with egg white derivatives (EWD). The phagocytic activity of PMN was analyzed by a flow cytometry system. The EWD did not show direct effect on the phagocytic response of PMN. The phagocytic activity of PMN was enhanced by culture supernatant from MNC but not PMN treated with EWD. Therefore, it was suggested that the enhanced phagocytic activity of feline PMN could be mediated by humoral factor(s) released from MNC treated with EWD. Thus, the phagocytosis-promoting factor(s) in supernatant fraction from MNC culture treated with EWD were isolated by reverse phase high pressure liquid chromatography. The resulting supernatant fraction on 29.02 minutes of retention time showed high phagocytic activity of PMN. The molecular weight of this supernatant fraction was 16 to 18 kDa when analyzed by capillary electrophoresis. The isoelectric point was pH 5.76 when assessed by ion-exchange chromatography. These results suggest that EWD stimulates feline MNC to elaborate a phagocytosis-promoting factor, 16 to 18 kDa of molecular weight, which could be an important mediator for the enhancement of phagocytic activity of feline peripheral blood phagocytes. Further study will be needed to elucidate this phagocytic factor.

• Journal of Microbiology and Biotechnology
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• 제14권2호
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• pp.344-349
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• 2004

A gene encoding inulin-degrading enzyme of Bacillus sp. snu-7 with ORF of 1536 nucleotides was cloned. And it was overexpressed as His-tagged protein in E. coli BL21(DE3) pLysS using pRSET B vector containing mature enzyme sequence. Maximum enzyme production was achieved by IPTG (0.1 mM) induction at $OD_{600}$ 1.2 and $30^{\circ}C$ followed by 6 h incubation. The expressed protein purified through immobilized metal affinity chromatography showed molecular mass of 60 kDa on SDS-PAGE. Results of thin-layer chromatography using inulin as a substrate showed the enzyme to be an exotype inulinase capable of producing only monomeric fructose as a product. $K_m$ and $k_{cat}$, for the hydrolyses of inulin and sucrose were $2.28\pm0.08$ mM and 358.05$\pm$20.38 $min^{-l}$, and 22.02$\pm$0.41 mM and 4619.11$\pm$215.12 $$min^{-1}, respectively. Optimal activity of the exoinulinase occurred at pH 7.0 and $50^{\circ}C$.

• Nuclear Engineering and Technology
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• 제55권4호
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• pp.1571-1584
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• 2023

In this study, a numerical analysis was performed as part of an international joint research project to reproduce a real cable tray fire that occurred in the heater bay area of the turbine building of a nuclear power plant. A sensitivity analysis was performed on various input parameters to derive results consistent with the sprinkler activation time obtained from the fire event analysis. For all sensitive parameters, the normalized sprinkler activation time correlated well with the power function of the normalized sprinkler height. A correlation equation was developed to identify the sprinkler activation time at any location when determining the slope or fire growth rate under the conditions assuming a linear or t-squared heat release rate (HRR) time curve. Various cable fire growth assumptions were used to determine which assumption was better to provide the prediction coincident with the information given from the fire event analysis in terms of the sprinkler activation time and total energy generated from cables damaged by fire. In the comprehensive analysis of all the sensitive parameters, the standard deviation of the input parameters increased as the sprinkler height decreased. Within the range of the sensitivity parameter values given in this study, when considering all sprinkler heights, the standard deviation of the cable model change was the largest and that of the overhang position change was the smallest.

• Journal of Chest Surgery
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• 제29권8호
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• pp.850-860
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• 1996

활성산소는 동물실험에서 심근 재관류손상의 중요기전으로 알려져 있으나 실제 임상상황에서의 역할은 아직도 논란이 많다. 본 연구에서는 냉혈 심마비 액을 사용한 심근보호법을 이용하여 관상동맥우회술 을 시행받는 환자들을 대상으로 하여 심근허혈후 재관류시 활성산소에 의한 심근의 손상 정도 및 활성 산소 방어효소계의 변동과 그 기전을 규명하고자 하였다. 관상동맥우회술을 받는 환자(n=10)를 대상으로 하여 관상정 맥동 환류혈액 에서 상행대동맥 차단 전과 재관류 20분 후에 lactate dehydrogenase(LDH), creatinG phosphokinase MB 분획(CK-MB)과 malondialdehyde(MDA)의 농도를 측정하였으며 또한 같은 시각에 심근의 superoxide dismutase(SOD), catalase, glutathione peroxidase(GSHPX), glutathione reductase(GSSGRd) 그BT고 glucose 6- phosphate dehydrogenase(GGPDH)의 활성도를 측정하였다 관상정 맥동혈에서의 LDH(268 $\pm$40.3 to 448 $\pm$ 84.9 ml plasma)와 CK-MB(4.50$\pm$ 2.33 to 27.1$\pm$13.5 Ulml plasma)의 활성도 그리고 MDA(5.87$\pm$2.02 to 10.5$\pm$2.23 nmol/ml plsma)의 양은 상행대동맥 차단 전에 비하여 재관류 후에 현저히 증가하였으 \ulcorner심근의 SOD(13.5$\pm$4.04 to 20.7$\pm$8.56 mg protein), GSHPX(279 $\pm$)7.2 to 325$\pm$51.4 mU/mg protein) 그리고 GSSCRd(97.2$\pm$15.9 to 122 $\pm$25.1 m2/mg protein)의 활성도도 재관류후에 현저히 증가하였다 반면 심근의 catalase와GSPDH의 활성도는의미있는 변화가 없었다 한편 SOD에 대한 Western blot결과 Cu, Zn-SOD의 양이 현저하게 증가되었음을 관찰 하였다. 이상의 결과들로 관상동맥우회술시 상행대동맥차단에 따른 심근허혈후 재관류에 의하여 활성산소에 의한 산화성 심근손상이 일어나지만 동시에 활성산소 방어효소계의 활성 또한 증가됨으로써 심근손상 의 정도가 약화되었을 가능성을 추정할 수 있으며 이러한 활성산소 방어효소의 활성증가는효소단백의 광합성 증가에 의한 것으로 여겨진다.

• 대한약침학회지
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• 제18권2호
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• pp.7-18
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• 2015

Objectives: Lawsone (1,4 naphthoquinone) is a non redox cycling compound that can be catalyzed by DT diaphorase (DTD) into 1,2,4-trihydroxynaphthalene (THN), which can generate reactive oxygen species by auto oxidation. The purpose of this study was to evaluate the toxicity of the phytomarker 1,4 naphthoquinone and its metabolite THN by using the molecular docking program AutoDock 4. Methods: The 3D structure of ligands such as hydrogen peroxide ($H_2O_2$), nitric oxide synthase (NOS), catalase (CAT), glutathione (GSH), glutathione reductase (GR), glucose 6-phosphate dehydrogenase (G6PDH) and nicotinamide adenine dinucleotide phosphate hydrogen (NADPH) were drawn using hyperchem drawing tools and minimizing the energy of all pdb files with the help of hyperchem by $MM^+$ followed by a semi-empirical (PM3) method. The docking process was studied with ligand molecules to identify suitable dockings at protein binding sites through annealing and genetic simulation algorithms. The program auto dock tools (ADT) was released as an extension suite to the python molecular viewer used to prepare proteins and ligands. Grids centered on active sites were obtained with spacings of $54{\times}55{\times}56$, and a grid spacing of 0.503 was calculated. Comparisons of Global and Local Search Methods in Drug Docking were adopted to determine parameters; a maximum number of 250,000 energy evaluations, a maximum number of generations of 27,000, and mutation and crossover rates of 0.02 and 0.8 were used. The number of docking runs was set to 10. Results: Lawsone and THN can be considered to efficiently bind with NOS, CAT, GSH, GR, G6PDH and NADPH, which has been confirmed through hydrogen bond affinity with the respective amino acids. Conclusion: Naphthoquinone derivatives of lawsone, which can be metabolized into THN by a catalyst DTD, were examined. Lawsone and THN were found to be identically potent molecules for their affinities for selected proteins.

• Natural Product Sciences
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• 제23권2호
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• pp.132-138
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• 2017

This study was designed to investigate the synergetic hepatoprotective effects from a mixture of Korean Red Ginseng and Pueraria Radix on carbon tetrachloride ($CCl_4$)-induced hepatotoxicity in mice. Liver toxicity was induced by intraperitoneal administration of $CCl_4$ (0.6 mg/kg) in 12 groups of ICR mice. The negative control group was given $CCl_4$ without test samples and the normal group was given no treatment. Among treatment groups, the RGAP treatment (Korean Red ginseng acetic acid extract : Pueraria radix water extract, w/w, 38.4:57.6) decreased $CCl_4$-elevated ALT (101.60 IU/L), AST (833.89 IU/L), and LDH (365.02 IU/L) levels in the serum, and increased the SOD (11.03 unit/mg protein) and CAT (0.37 unit/mg protein) levels and the LPO levels ($59.09{\mu}M/g$ tissue) more than that in the mice group with $CCl_4$-induced control group hepatotoxicity. These results suggest that administration of a mixture of Korean Red ginseng and Pueraria radix decreases $CCl_4$-induced liver damage and enhances antioxidant activity in mice and imply that administration of the mixture in a certain ratio is more effective than single administration of either Korean Red ginseng or Pueraria radix alone.

• The Korean Journal of Physiology
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• 제21권1호
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• pp.59-66
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• 1987

This study was aimed to investigate whether the conduction velocity of nerve impulses through the ventral afferent fibers is constant along their entire courses in dorsal as well as in ventral roots. Cats were anesthetized with ${\alpha}-chloralose$ (60 mg/kg, i.p.) and artificially ventilated. Laminectomies were done on L4-S1 spinal vertebrae to expose the lumbosacral spiral cord. Both ventral and dorsal roots of L7 or S1 spinal segments were isolated and cut near the spinal cord. Ventral roots were placed on 6-lead stimulating electrodes and stimulated with supra C-threshold intensity. Divided dorsal root fascicles were placed on bipolar recording electrodes and single fiber units activated by the stimulation of the ventral roots were identified. Followings are the results obtained: 1) A total of 27 VRA units were identified. 10 units of them conducted impulses slower than 2 m/sec. Conduction velocities of the remaining units were in the range of 3.11-20.91 m/sec. 2) In 12 Units conduction velocities Of the VRA units through dorsal$(CV_{DR})$ and venral root$(CV_{DR})$ were determined respectively. There was a tendency to conduct impulses faster through dorsal roots$(CV_{DR}=8.19{\pm}3.26\;m/sec)$ than ventral roots$(CV_{DR}=3.46{\pm}1.02\;m/sec)$. From the above results we confirmed that there exist nerve fibers in continuity between the spinal ventral and dorsal roots but we could not ascertain whether there is a change in conduction velocity through the entire course of ventral afferent unit.

• 한국임상수의학회지
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• 제33권1호
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• pp.21-24
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• 2016

4마리의 개와 2마리의 고양이에서 질병의 정확한 진단을 위해 복강경을 이용한 생검을 시행하였다. 환견 및 환묘들의 주요호소증상은 1마리(case 5, 발작)를 제외하고 구토였다. 2마리의 환견(case 1, 5)은 간 생검이, case 2(소장)를 제외한 나머지 환묘들은 위와 소장의 생검이 지시되었다. 수술은 일반적인 수술 방법을 응용하여 시행하였다. 모든 환견 및 환묘들은 특별한 이상 없이 회복하였고 입원 치료는 불필요하였으며 어떠한 부작용도 관찰되지 않았다. 복강경을 이용한 생검은 절개 길이를 줄이고 회복을 빠르게 하는 이점을 지닌 것으로 생각된다.