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Historical Trend of Butyltin Contamination in Sediment Cores from the Coastal Environments of Korea
Shim, Won-Joon,Yim, Un-Hyuk,Kim, Nam-Sook,Hong, Sang-Hee,Oh, Jae-Ryoung The Korean Association of Ocean Science and Techno 2004 Journal of Ocean Science and Technology Vol.1 No.1
In the present study, butyltin compounds in sediment cores were quantitatively determined to study vertical distribution of these compounds along the coast of Korea. Butyltins in sediment core were analyzed to investigate the trend of past organotin contamination in Korea and to estimate the half-life of TBT in sediments. Butyltin compounds were detected from the entire sediment core samples at 14 stations. TBT, and its degradation products, dibutyltin (DBT) and monobutyltin (MBT), concentrations ranged 〈1-46100, 〈1-4320 and 〈2-2460 ng Sn/g on a dry weigt basis, respectively. The highest butyltin concentrations were found in front of the repairing shipyard in Ulsan Bay at which total butyltin concentration reached up to 51620 ng Sn/g. Each butyltin compound showed significant correlation among tri-, di- and mono-substituted compounds. Sedimentation rates were estimated based on $^{210}$ Pb activity profiles. The half-lives of TBT in eight undisturbed sediment cores were calculated from the estimated sediment age and TBT concentration profiles. The half-lives for TBT ranged from 1.8 to 9.9 years and the mean value was 4.9 year. Relatively longer half-lives were obtained from cores Ulsan Bay (9.9 yr), Kamak Bay (8.3 yr) and Dangdong Bay (6.3 yr). The half-lives of the other cores were less than 5 yr. Butyltin concentrations were high enough to affect marine organisms near harbor and shipyard, and vertical distribution of butyltin compounds in sediment showed active use of them in Korean peninsula for the past decades. The half-lives of TBT in a year scale provide a concern on persistence of this compound in marine sediment even after world-wide total ban on use of TBT.
고효율 습식 아민 CO2 흡수제(KoSol-4)를 적용한 Test bed 성능시험
심재구 ( Jae Goo Shim ),이지현 ( Ji Hyun Lee ),곽노상 ( No Sang Kwak ),이인영 ( In Young Lee ),장경룡 ( Kyung Ryoung Jang ),장세규 ( Se Gyu Jang ),이경자 ( Kyung Ja Lee ),한광수 ( Gwang Su Han ),오동훈 ( Dong Hun Oh ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.2
Test bed studies with highly efficient amine CO2 solvent (KoSol-4) developed by KEPCO research institute were performed. For the first time in Korea, evaluation of post-combustion CO2 capture technology to capture 2 ton CO2/day from a slipstream of the flue gas from a coal-fired power station was performed. Also the analysis of solvent regeneration energy was conducted to suggest the reliable performance data of the KoSol-4 solvent. For this purpose, we have tested 5 campaigns changing the operating conditions of the solvent flow rate and the stripper pressure. The overall results of these campaigns showed that the CO2 removal rate met the technical guideline (CO2 removal rate: 90%) suggested by IEA-GHG and that the regeneration energy of the KoSol-4 showed about 3.0~3.2 GJ/tCO2 which was, compared to that of the commercial solvent MEA (Monoethanolamine), about 25% reduction of regeneration energy. Based on these results, we could confirm the good performance of the KoSol-4 solvent and the CO2 capture process developed by KEPCO research institute. And also it was expected that the cost of CO2 avoided could be reduced drastically if the KoSol-4 is applied to the commercial scale CO2 capture plant.
Promoter Structure and Transcriptional Activity of Human Complement Receptor Type I (CR1) Gene
Kim, Jae-Hyun,Lee, Young-Ju,Nam, Ju-Ryoung,Shim, Hee-Bo,Choe, Soo-Young The Korean Society for Integrative Biology 2003 Korean journal of biological sciences Vol.7 No.1
Until recently, interest in human complement receptor type I (CR1) has focused on immune complex processing, which contributed to our understanding of regulatory mechanism of complement activation. However, the promoter structure and transcriptional regulation of human CR1 gene has not been clear. To study the unique regulation of human CR1 gene expression, we assessed promoter activity of the $5^1$-flanking region of human CR1 gene using transient transfection and gel mobility shift assays. In this study we demonstrated that NF-Y binds to the inverted CCAAT element and that the functional interaction with protein(s) which bind to the GC-rich motif may be necessary for optimal transcription of human CR1 gene. We also show that sequence elements which located at-95/58 and +45/+50 are important for optimal transcription of CR1 gene.
기관지천식의 중증도에 따른 안지오테신 전환효서 유전자 다형에 관한 연구
조재연(Jae Youn Cho),차대룡(Dae Ryoung Cha),한선애(Seon Ae Han),이상엽(Sang Yeub Lee),이신형(Shin Hyung Lee),강세용(Sea Yong Kang),심재정(Jae Jeong Shim),강경호(Kyeong Ho Kang),유세화(Se Hwa Yoo),인광호(Kwang Ho In) 대한천식알레르기학회 1998 천식 및 알레르기 Vol.18 No.4
Background: The angiotensin-converting enzyme (ACE) has a major role in the degradation of bradykinin, tachykinin, substance P which are associated with bronchial hyperresponsiveness and inflammation. The other role of ACE is the genesis of angiotensin II which causes bronchial smooth muscle contraction. The deletion polymorphism of ACE gene(DDtype) may be related to the high serum level of ACE. Objective: We studied to evaluate an association between the insertion /deletion polymorphism of the ACE gene and asthma, and its severity. Materials and methods: Sixty asthmatic patients and 44 healthy controls were enrolled. Severity of asthma was classified by the guideline of NHLBI/WHO workshop. The ACE genotypes of all the subjects were determined by polymerase chain reaction. Results: The distribution of ACE genotypes were not significantly different between healthy controls and asthma group (p)0.05). In asthmatic patients, the genetic polymorphism was similar between different severity groups (p) 0.05). Conchcsion: It is suggested that I/D polymorphism of the ACE gene may not be associated with development of asthma. The severity of asthma may not be influenced by I/D polymorphism of the ACE gene.
Shin, Won-Joon,Oh, Jae-Ryoung,Kahng, Sung-Hyun,Shim, Jae-Hyung,Lee, Soo-Hyung The Korean Society of Oceanography 1998 Journal of the Korean Society of Oceanography Vol.33 No.3
Butyltin and phenyltin residues were quantified in seawater and biota of the Chinhae Bay System, Korea in 1995. Butyltin compounds were detected in all seawater and biota samples, whereas phenyltin compounds were found only in the biota samples. Tributyltin (TBT) concentrations in seawater ranged from < 8-35 ng Sn/l. Tributyltin concentrations in Crassostyea gigas and Thais clavigera ranged from 95-885 and 23-414 ng Sn/g, respectively, Triphenyltin(TPhT) concentrations in each species ranged 155-678 and 46-785 ng Sn/g, respectively. Spatial distribution of TBT was closely related to boating and dry-docking activities. However, spatial distribution of TPhT was not consistent with that of TBT. The biological concentration factor for TBT in C. gigas was about 25000 that is four times greater than that of T. clavigera. Butyl- to phenyltin concentration ratio was greater than one in C. gigas, but that in T. clavigera was less than one. Major tissues of C. gigas also showed different accumulation patterns for butyl- and phenyltin compounds. Furthermore, 19 and 28% of total body burdens of TBT and TPhT were found in gonadal mass of C. gigas just prior to spawning.