Low Density Lipoprotein의 실측치와 계산치에 관한 조사

김언규,정재린,이경옥,서덕규,이규범 대한임상병리사협회 1993 대한임상병리사회지 Vol.25 No.1

금강 수서생태계의 구조와 기능에 관한 연구 : 수질 및 미생물

이규승,김윤석,오덕환,이영하,임항식 忠南大學校 環境問題硏究所 1995 環境硏究 Vol.13 No.-

소백산맥의 주봉인 덕유산에서 발원하여 군산지역에서 황해로 유입되는 금강의 본류는 총 유로연장이 401.4km에 이르는 우리나라 4대강 중의 하나이며, 대전광역시, 충청남북도 및 전라북도 일부지역의 생활용수 및 산업용수의 공급원으로서 대단히 중요한 역할을 담당하고 있다. 1960년대 이후 계속적으로 추진된 경제개발과 공업화 정책에 의해 인구의 도시집중화, 생활수준의 향상등이 이루어지고, 이에 따라 양질의 생활용수 및 산업용수에 대한 수요는 계속적으로 크게 증가하고 있는 실정이다. 그러나 금강의 경우 도시의 생활하수, 공업단지로부터의 공업폐수, 유역의 축산폐수 등에 의해 수질을 비롯한 수환경의 악화가 점차 심화되고 있으며, 이에 따른 수서생태계의 변화도 매우 큰 것으로 보고되고 있다. 특히 최근에 조성된 바 있는 금강 하구둑이 94년 8월부터 가동되고 있고, 또 1995년 이후 금강종합개발이 중류와 하류지역을 중심으로 대대적으로 시행될 예정이어서 금강 본류의 수환경은 장차 많은 변화가 예상된다. 수환경의 변화는 생육하는 생물들의 종조성은 물론 군집의 구조와 기능에 큰 영향을 미치기 때문에 금강 본류의 수서생태계에도 많은 변화가 수반될 것으로 예측되고 있다. 이와 같이 금강본류를 대상으로 하는 사업이 시행된 후 야기되는 수환경의 변화는 장기간에 걸친 조사를 요구하며, 이로부터 얻은 결과를 사업 시행 이전의 조사 결과와 비교함으로써만이 효과적으로 그 경향을 파악할 수 있다. 또한 이러한 비교 분석은 수질관리를 위한 대책 수립과 효율적인 사후 환경관리를 모색하는데 대단히 중요하다. 이에 반하여 지금까지 금강을 대상으로 한 수환경 및 수서생태계의 조사 연구는 단편적인 분야에 대하여 극히 단기간 수행된 것이 대부분이고 정량분석이 아닌 정성분석에만 치중되었기 때문에 금강의 수질 및 생태게보존을 위한 자료로서의 기능을 발휘하지 못하고 있다. 이러한 관점에서 본 환경문제연구소에서는 장기(향후 5년 이상)적인 계획하에 금강본류를 대상으로 수서생태계의 구조와 기능을 조사ㆍ분석하고, 이를 통하여 금강의 수질 및 생태계보존과 수환경관리를 위한 기초자료를 수립하고자 한다. 이와 같이 본 환경문제연구소가 장기적으로 추진하려 하는 금강 수서생태계학술조사는 금강 수서생태계의 현황은 물론 금강을 대상으로 하는 여러가지 형태의 사업에 의한 변화 양상을 정확하게 파악하고, 이에 대한 적절한 대처 방안을 강구하게 할 수 있는 기초자료를 제공하여 줄 것으로 기대된다. 지금까지 금강에 대한 종합적인 생태계 조사가 이루어지지 않고 있음을 고려할 때, 본 학술조사는 장차 금강 수서생태계에 대한 연구의 지침이 될 것으로 기대되며, 이는 본교가 금강 생태계의 보존과 관리를 통하여 지역사회에 기여하는 중추적 학술기관으로서의 위치를 확고히 마련하는 계기가 될 것이다. 본 보고서는 이러한 연구계획의 1차년도 연구결과로서 수질 및 미생물, 수생식물, 어류, 동식물 플랭크톤, 수서곤충을 중심으로 금강 중ㆍ하류 유역 수서생태계를 구성하고 있는 주요 생물군의 구조와 기능을 정량적으로 조사ㆍ분석하는데 그 목적을 두었다. Heterotrophic microbial populations and physicochemical parameters of water samples collected from six stations on the Keum River have been examined from November 1994 to July 1995. The ranges for BOD and COD were 1.5-11.3㎎/L and 2.1-13.7㎎/L, respectively. At the station closest to the estuary, the values of BOD and COD were higher than at other stations, but those of PO₄-P were lower. Metal ions including Cu, Mn, Pb, Cd, and Hg were not detected at all. The population densities of heterotrophic bacteria amounted to 13.7-22.0% of the total bacteria. The densities of coliforms, Salmonella-Shigella, and yeasts were in the range of 49-538 cfu/ml, 16-271 cfu/100ml, and 30-259 cfu/㎖, respectively.

인슐린의 세포사멸억제 작용에서 신호전달경로의 특성

허규희,허정식,김선욱,이영기,박덕배 제주대학교 생명과학기술혁신센터 2002 제주생명과학연구 Vol.5 No.-

Insulin has a variety of activities like as glucose uptake, inhibition of lipolysis, glycogen biosynthesis in a number of cells and tissues. Recently insulin has known to exert an antiapoptotic activity in different cell systems. However, it is not clear by which insulin can protect apoptosis cells from apoptosis. Thus, CHO cells expressing the human insulin receptors (CHO-IR) were used to evaluate the importances of different signaling steps activated by insulin in this process. The Ras/Raf-1/MEK/ERK cascade and the serine/threonine protein kinase Akt are two survival pathways that may be activated in response to insulin. We tested the hypothesis that inhibition of farnesylated Ras was casually related to manumycin-induced apoptosis and showed that the response to manumycin was found to be independent of K-Ras function. Moreover, blocking Ras/Raf-1/MEK/ERK cascade by the expression of a transdominant inhibitory mSOSI mutant in CHO-IR cells kept cells to sensitive to the antiapoptotic action of insulin. Insulin-dependent activation of Akt was blocked by 4th treatment with manumycin. This study suggest that the deplection of short-lived farnesylated proteins by manumycin suppresses the antiapoptotic action of insulin at least in part by disrupting Akt­activation but not of the K-Ras/Raf-1/MEK/ERK-dependent cascade.

飼料資源開發을 위한 雜灌木樹葉의 飼料價値와 韓牛의 放牧利用에 關한 硏究

尹益錫,陸完芳,李仁德,曺圭燉,金炯基 건국대학교 1978 學術誌 Vol.22 No.1

As a part of forestry utilization for livestock feed resources the feeding value ague of shrub leaf by growth stage and grazing behabiour of the native cattle at shrubby grassland in function of seasons were investigated and the following results were obtained. 1. The crude protein content of oak leaf declined as the growth stage increased whereas the contents of crude fiber and crude fat showed the opposite tendency. 2. The intake of oak leaf paralleled with the amount given while the intake of the mixed grass leas remarkable increased and the body weight gain was also remarkably increased. 3. The average number of oak leaf intake was 70.5 times for spring, 148.7 for summer, and 395.7 for autumn. 4. The grazing time by the native cattle was decreased in the order of spring, autumn, and summer. As for the grazing behaviour, the intake activity was most active during morning, mid-day and late afternoon or three times a day. 5. The duration of rumination was found to be in the decreasing order or summer, autumn and spring, cattles ruminated more when the grasses were more abundant. 6. As for the inactive period of animal, it was short during spring when the animals spent more time for eating but it was about 5 times longer during both summer and autumn.

비탈분극성 근육이완제(Pancuronium)에 대한 Atropine 과 Neostigmine 의 혼합 주사로 인한 심박수의 변화

김규삼,김성덕,김광우,권무일,오용석,김봉덕 대한마취과학회 1979 Korean Journal of Anesthesiology Vol.12 No.4

Around the time of recovery from general anesthesia we usually use atropine and neostigmine to counteract the effect of muscle relaxant that is remaining in the body. We used various kinds of combinations of atropine and neostigmine to see the effect of them on heart rate. The combinations were as follows: I) atropine 0.02mg/kg+neostigmine 0. 02mg/kg. 2) atropine 0. 2mg /kg+neostigmine 0.03mg/kg. 3) atropine 0. 02mg/kg+neostigmine 0.04mg/kg. 4) atropine 0.02mg/kg+neostigmine 0.05mg/kg. 5) atropine 0.02mg/kg+neostigmine 0.06mg/kg. 6) atropine 0.02mg/kg+neostigmine 0.07mg/kg. Ten subjects(ps.I.ASA) were taken for each combination. Thus total sample size of the six combinations were sixty, Each study has been performed in the state of ASA P.S.1, and anesthetized for b but two hours. N₂O-O₂-Halothane technique was used for anesthesia. The dosage of pancuronium was 0. 08mg/kg. The age distribution of the sample was 2 to 60, and male to female ratio was 4 to 6. We came to the following conclusions from this stud 1) Types of dosage combinations those caused little change in heart rate were; atrop!ne 0.02mg/kg+neostigmine 0.02mg/kg, and atropine 0.02mg/kg+ neostigmine 0.03mg/kg. 2) Just after the simultaneous injection of the drugs, there appeared mild tachycardia, but fifteen minutes after the administration severe bradycardia came on and, after that the heart rate returned to normal. 3) The combinations which included neostigmine, more than 0. 04mg/kg, caused severe braycardia, and the most severe bradycardia was seen with a combination of atropine 0.02mg/kg and neostigmine 0.06mg/kg.

Response of Odontoblast to the Bio-Calcium Phosphate Cement

Kim, Jin-Woo,Kim, Sung-Won,Kim, Gyoo-Cheon,Kim, Yong-Deok,Kim, Cheol-Hun,Kim, Bok-Joo,Kim, Uk-Kyu Korean Association of Maxillofacial Plastic and Re 2011 Maxillofacial Plastic Reconstructive Surgery Vol.33 No.4

Purpose: If the tooth structure is damaged, then it is impossible to regenerate the tooth. The materials used to restore the tooth structure are not related to the composition of the tooth. The materials used to restore the structure can't replace the natural tooth because they just fill the defective structure. Calcium phosphate cement remineralizes the dentin and almost replaces the natural tooth, but there are some disadvantages. We conducted basic tests with Biomimetic CPC (Bio-CPC) to make sure of the possibility of the biomaterial to remineralize the defective tooth structure. Methods: In this study, the bioactivity and biocompatibility of Bio-CPC were evaluated for its potential value as the bio-material for regeneration of damaged tooth structure by conducting a cell toxicity assay (WST-1 assay), a cytokinesis-block micronucleus assay, a chromosomal aberration test, total RNA extraction and RT-PCR on MDPC-23 mouse odontoblast-like cells. Results: The in vitro cytotoxicity test showed that the Bio-CPC was fairly cytocompatible for the MDPC-23 mouse odontoblast-like cells. Conclusion: Bio-CPC has a possibility to be a new biomaterial and further study of Bio-CPC is needed.

Characterization of Al Doped ZnO Thin Films Prepared by RF Magnetron Sputtering Under Various Substrate Temperatures

Deok Kyu Kim,Hong Bae Kim 한국진공학회(ASCT) 2014 Applied Science and Convergence Technology Vol.23 No.5

Al doped ZnO thin films have been deposited by a RF magnetron sputtering technique from a ZnO (2 wt.% Al₂O₃) target onto glass substrates heated at temperature ranging from RT to 400℃. X-ray diffraction analysis shows that the deposits have a preferential growth along the c-axis of a hexagonal structure. The full with at half maximum decreases from 0.45 to 0.43° in the studied temperature range. The root main square surface roughness increases with substrate temperature from 1.89 to 2.67 nm. All films are transparent up to 80% in the visible wavelength range and the adsorption edge is red-shifted with substrate temperature from RT to 400℃. The sheet resistance increases from 92 ohm/sq to 419 ohm/sq when the deposition temperature increases from RT to 400℃. The increment of sheet resistance is caused by lowered carrier concentration resulting from an increase in surface roughness.

Isolation and Characterization of a Type II Peroxiredoxin Gene from Panax ginseng C. A. Meyer

Kim, Yu-Jin,Lee, Jung-Hye,Lee, Ok-Ran,Shim, Ju-Sun,Jung, Seok-Kyu,Son, Na-Ri,Kim, Ju-Han,Kim, Se-Young,Yang, Deok-Chun The Korean Society of Ginseng 2010 Journal of Ginseng Research Vol.34 No.4

A peroxiredoxin cDNA (PgPrx) was isolated and characterized from the leaves of Panax ginseng. The cDNA is 716 nucleotides long and has an open reading frame of 489 base pairs with a deduced amino acid sequence of 162 residues. The calculated molecular mass of the mature protein is approximately 17.4 kDa with a predicted isoelectric point of 5.37. A GenBank BlastX search revealed that the deduced amino acid sequence of PgPrx shares a high degree homology with type II peroxiredoxin (Prx) proteins in other plants. The PgPrx gene was highly expressed in leaves, and expressed at a low level in the stem. To analyze the gene expression of PgPrx in response to various abiotic stresses, we utilized real-time quantitative RT-PCR. Our results reveal that PgPrx expression is induced by ultraviolet irradiation, low temperature, and salt. The induction of PgPrx in response to abiotic stimuli suggests that ginseng Prx may function to protect the host against environmental stresses.

Dislocation Reduction of GaN Layer with a SiN Mask by Using Metalorganic Chemical Vapor Deposition

Deok Kyu Kim 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.5

GaN layers with an in-situ SiN mask were grown by using metalorganic chemical vapor deposition (MOCVD) and the physical properties of the GaN layer were studied. Also, the influence of a SiN mask on the optical property of GaN layer was investigated. By inserting a SiN mask, the (102) full width at half maximum (FWHM) decreased from 480 arcsec to 409 arcsec, and the threading dislocation (TD) density decreased from 3.21 $\times$ 10$^{9}$ cm$^{-2}$ to 9.7 $\times$ 10$^{8}$ cm$^{-2}$. The photoluminescence (PL) peak intensity of sample with a SiN mask increased by 2 times compared to that of sample without a SiN mask. We have shown that a SiN mask significantly improved the physical and the optical properties of the GaN layer.

Effect of Heat Treatment Method on Properties of ZnO Thin Films Deposited by RF Magnetron Sputtering

Kim, Deok Kyu The Korean Vacuum Society 2017 Applied Science and Convergence Technology Vol.26 No.2

ZnO thin films which were deposited by RF magnetron sputtering system were annealed by furnace and insitu heat treatment methods. We investigated the effect of heat treatment method on physical properties of ZnO thin films. The structural and optical properties of ZnO thin films were improved by heat treatment. Through the annealing treatment of ZnO film by furnace, the good crystallinity and ultraviolet emission were obtained. These results are attributed to the improved formation of Zn-O bond in ZnO thin film annealed at by furnace. We confirm that the formation of Zn-O bond plays an important role in obtaining the excellent structural and optical properties of ZnO thin films.