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Effect of Ethanol on the Teratogenicity of Hypervitaminosis A in Rats
조대현,진강,조태순,Cho, Dae-Hyun,Chin, Kang,Cho, Tae-Soon The Korean Society of Food Hygiene and Safety 1990 한국식품위생안전성학회지 Vol.5 No.4
SPF wistar계 랫트를 이용하여 Vitamin A(VA)의 과잉 투여 ($40{\times}10^4IU/kg$)에 의한 최기형성 대하여 ethanol(E) 2g/kg을 임신 9일부터 임신 11일까지 3일간 경구로 병용 투여한 결과 다음과 같은 결과를 얻었다. 1.임신 모체의 영향에 있어서 $VA{\times}E$ 병용 투여군이 대조군 및 VA 단독투여군에 비해 유의한 체중증가의 억제를 보였다. 2. 태자 사망율은 VA+E 병용 투여군이 VA 단독 투여군에 비해 유의하게 증가되었고 (p<0.05), 태자의 평균 체중은 VA+E 병용 투여군에 대조군에 비해 유의하게 감소되었으며(p<0.01), VA 단독 투여군과의비교에서도 유의한 감소를 보였다. (p<0.05). 3. 외표기형의 발생율은 VA 단독투여군에 비해 VA+E 병용투여군이 증가되어 나타났다. 발현된 기형의 특징은 귀위치이상, 부이(복이), 안검개존, 소구증, 단악증, 구개열 등이다. 이상의 경과에서 Vitamin A의 과잉투여에 의한 최기형성에 ethanol이 상승적으로 작용함을 알 수 있다. The effects of ethanol (ET) on the teratogenicity of the fat soluble drug, Vita. min A (VA) were examined in SPF Wistar rats. VA and ET were orally administered with sonde. The drugs were administered for 3 days of day 9-11 of gestation. Four groups were made; G-I control (sesame oil + saline), G-II VA $40{\times}10^{4}$ (I.Ulkg/day), G-III ET 2 (g/kg/day), G-IV $40{\times}10^{4}$ + ET 2. Congenital malformations were found G-II, G-III and G-IV. All fetuses in G-IV combination had malforamtions. Main malformation in G-IV combi. nation were microstomia, disposition of ear, open eyelids brachygnathia and cleft plate. Accordingly it might be demonstrated that the teratogenicity of hypervitaminosis A was pontentiated by concurrent ethanol in rats.
마약류 및 산업환경화학물질에 의한 GFAP의 신경독성표지물질화에 관한 유용성
조대현,정용,김준규,이봉훈,황세진,이원용,김정구,조태순,김진석,문화회,Cho, Dae-Hyun,Jeong, Yong,Kim, Jun-Gyou,Lee, Bong-Hun,Hwang, Se-Jin,Lee, Won-Yong,Kim, Jeong-Goo,Cho, Tai-Soon,Kim, Jin-Suk,Moon, Hwa-Hwey 한국독성학회 1995 Toxicological Research Vol.11 No.2
Diverse neurotoxic insults result in proliferation and hypertrophy of astrocytes, a subtype of glia in central nervous system. The hallmark of this response, often terms "reactive gliosis", is the enhanced expression of the major intermediate filament protein of castrocytes, glial fibrillary acidic protein (GFAP). These changes in the astrocytes suggest that GFAP may be a useful biochemical indicator of neurotoxicity. To investigate this possibility, we administered intra-peritoneally prototype nerotoxicants, metharnphetamine (MAP, 5 mg/kg), cocaine (30 mg/kg), N-buthyl benzenesulfonamide (NBBS, 300 mg/kg) and trimethytin (TMT, 8 mg/kg) to Wistar Rats and then assessed the effects of these agents on content of GFAP, which were determined by Sandwish ELISA and evaluated with neurotoxic symptoms, and quantitative changes of imrnunoreactivity of GFAP by light microscopic image analysis in specific regions. We found that assay of GFAP revealed time- and region-dependant patterns of neurotoxicity. The GFAP immunoreactivity of rat brain was increased in substantia nigra and hippocampus by MAP, NBBS and TMT; in roedial septal nucleus and nucleus accurnbens, it was also increased by RrBBS. Sandwich ELISA showed that GFAP levels of cerebrum in all groups on days 3 and 7 and that of brainstem(including cerebellum) in MAP, NBBS groups on day 1 and 3 were increased. A review of the background, design and results of these experiments are presented in this paper. Our findings indicate that GFAP is a sensitive and specific biomarker of neurotoxicity.otoxicity.
차량의 연료 소비 감소를 위한 병목 도로에서 도로 교통 정보 기반 Green Drive 제어에 관한 연구
조대현,이충훈,임명섭,Cho, Dae-Hyun,Lee, Chung-Hoon,Lim, Myung-Seob 한국융합신호처리학회 2012 융합신호처리학회 논문지 (JISPS) Vol.13 No.3
본 논문에서는 차량의 흐름을 지체시키는 병목 지점에서 차량의 연료소비 감소를 위한 WAVE 방식 기반 V2V 및 V2I 의 정보 통신 기술을 이용하여 차량의 상대적인 속도를 제어하는 방법을 제안하였다. 연비 효율 비교 분석을 위한 모델을 제시하여 주기적으로 차량의 정차를 요하는 교통 신호등 방식보다 제안하는 방식이 병목 지점에서 연비 효율이 높아짐을 보였다. 또한 이 방식에서 병목지점에 진입하는 차량 간 속도 제어를 위한 감 가속도 유도 알고리즘을 제시하였다. In this paper, the method of controlling velocity between joining vehicles at the point of bottleneck using information and communications technology of WAVE method based V2V and V2I are proposed for the driving with high fuel efficiency. Using the derived fuel-efficiency comparative analysis model, it was shown that the proposed method's fuel efficiency is better than traffic light method demanding periodically vehicle's stop. Also, this method provides the derivation algorithm for deceleration and acceleration for controlling velocity between vehicles approaching bottleneck area.
Quinone계 화합물의 발암성 조기검색법에 관한 연구
조대현,홍진태,박정식,홍연탁,진강,정명희,이병무,Cho, Dae-Hyun,Hong, Jin-Tae,Park, Jeong-Sik,Hong, Youn-Tack,Chin, Kang,Jung, Myung-Hee,Lee, Byung-Mu 한국독성학회 1992 Toxicological Research Vol.8 No.2
To investigate a short term screening method for carcinogenic quinone compounds, 8-hydroxydeoxyguanosine (8-OHdG), an oxidative DNA damage, was determined in the kidney and liver DNA isolated from Sprague-Dawley rats after i.p.injection of 7 mg/kg adriamycin (AM), 7mg/kg tetrahydropyranyladriamycin (THP), and 10mg/kg daunomycin (DM) by HPLC-electrochemical detector system. 8-OHdG was also determined from rat hepatocvtes and calf thymus DNA exposed to AM, DM and THP. When rats were treated with DM and THP, 8-OHdG was significantly increased in the kidney compared to control group, and remained at high level (7.9~9.0, 8-OHdG/dG${\times}10^4$)at the end of experiments (48hr after treatment). 8-OHdG level in cultured hepatocyte exposed to AM, DM and THP was 1.5~2 fold higher than control at all time points. (1,2,3,4hr after treatment). From calf thymus DNA exposed to AM, DM and THP, 8-OHdG was 2.5 fold higher than of control. These results suggest that quantitation of 8-OHdG may provide a useful marker for identifying target organ in oxidative chemical carcinogenesis and for short term screening of free radical generating carcinogens.
신경세포 배양법을 이용한 methamphetamine과 cadmium의 신경독성 평가
조대현,김준규,정용,이봉훈,김은엽,김정구,조태순,김진석,문화회,Cho, Dae-Hyun,Kim, Jun-Gyon,Jeong, Yong,Lee, Bong-Hun,Kim, Eun-Youb,Kim, Jeong-Goo,Cho, Tai-Soon,Kim, Jin-Suk,Moon, Hwa-Hwey 한국독성학회 1996 Toxicological Research Vol.12 No.1
Primary culture of cerebellar neuronal cells derived from 8-day old Long-Evans rats was used. Pure granule cells, astrocytes or mixed cells culture systems were prepared. These cells were differentiated and developed synaptic connections. And the astrocytes were identified by immunostaining with glial fibrillary acidic protein (GFAP). Methamphetamine (MAP), which acts on dopaminergic system and cadmium (Cd), a toxic heavy metal, were applied and biochemical assays and electrophysiological studies were performed. $LC_50$ values estimated by MTT assay of MAP and Cd were 3 mM and 2$\mu M$ respectively. Cells were treated with 1 mM or 2 mM MAP and 1$\mu M$ $CdCl_2$ for 48 hour, and the incubation media were analyzed for the content of released LDH. MAP (2 mM) and Cd significantly increased the LDH release. Cell viability was decreased in both groups and some cytopathological changes like cell swelling or vacuolization were seen. The cerebellar granule cells were used for measuring membrane currents using whole-cell clamp technique. Sodium and potassium currents were not affected by MAP neither Cd, but calcium current was significantly reduced by Cd but not affected by MAP. Therefore, in vitro neurotoxicity test system using neuronaI cells and astrocytes cultures were established and can be used in screening of potential neurotoxic chemicals.
조대현(Dae Hyun Cho),이지연(Ji Yeon Lee),정연돈(Yon Dohn Chung),김명호(Myoung Ho Kim),홍희경(Hee Kyung Hong),유광일(Kwang Il Yoo),유병규(Byung Kyu Yoo) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.2Ⅰ
집합의 표현 방법에는 원소들을 그대로 가지고 있는 배열 형태와 유한한 집합에 한해서 0,1로써 표현하는 비트 벡터가 있다. 집합의 크기가 매우 클 때는 표현 방법과 연산 처리 기법이 저장 공간 및 처리 시간면에서 문제가 된다. 이 논문에서는 유한집합이지만, 범위가 매우 큰 집합에 대하여 집합 연산의 처리 기법들을 소개하고, 그 성능을 비교해 보고, 범위의 크기와 집합 연산에 참여하는 집합의 원소 수에 따른 좋은 집합 표현 방법과 집합 연산 처리 기법을 소개한다.
생체 흡수성 임플란트용 Mg-4Zn-0.5Ca 합금의 인장 및 부식 특성에 미치는 Si, Mn, Sn의 영향
조대현 ( Dae Hyun Cho ),남지훈 ( Ji Hoon Nam ),이병우 ( Byeong Woo Lee ),박지영 ( Ji Yong Park ),신현정 ( Hyun Jung Shin ),박익민 ( Ik Min Park ) 대한금속재료학회(구 대한금속학회) 2015 대한금속·재료학회지 Vol.53 No.3
Effect of elements Si, Mn, Sn on tensile and corrosion properties of Mg-4Zn-0.5Ca alloys were investigated. The results of tensile properties show that the yield strength, ultimate tensile strength and elongation of Mg-4Zn-0.5Ca alloy increased significantly with the addition of 0.6 wt% Mn. This is considered the grain refinement effect due to addition of Mn. However addition of 0.6 wt% Si decreased yield strength, ultimate tensile strength and elongation. The bio-corrosion behavior of Mg-4Zn-0.5Ca-X alloys were investigated using immersion tests and potentiodynamic polarization test in Hank``s solution. Immersion test showed that corrosion rate of Mg-4Zn-0.5Ca-0.6Mn alloy was the lowest rate and addition of 1.0 wt% Sn accelerated corrosion rate due to micro-galvanic effect in α-Mg/CaMgSn phases interface. And corrosion potential (Ecorr) of Mg-4Zn-0.5Ca-0.6Mn alloy was the most noble among Mg-4Zn-0.5Ca-X alloys.(Received April 2, 2014)