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Lee, Sangwoo,Kim, Cheolmin,Kim, Jungkon,Kim, Woo-Keun,Shin, Hyun Suk,Lim, Eun-Suk,Lee, Jin Wuk,Kim, Sunmi,Kim, Ki-Tae,Lee, Sung-Kyu,Choi, Cheol Young,Choi, Kyungho D. Reidel Pub. Co ; Springer 2015 Environmental monitoring and assessment Vol.187 No.7
<P>Zacco platypus, pale chub, is an indigenous freshwater fish of East Asia including Korea and has many useful characteristics as indicator species for water pollution. While utility of Z. platypus as an experimental species has been recognized, genetic-level information is very limited and warrants extensive research. Metallothionein (MT) is widely used and well-known biomarker for heavy metal exposure in many experimental species. In the present study, we cloned MT in Z. platypus and evaluated its utility as a biomarker for metal exposure. For this purpose, we sequenced complete complementary DNA (cDNA) of MT in Z. platypus and carried out phylogenetic analysis with its sequences. The transcription-level responses of MT gene following the exposure to CdCl2 were also assessed to validate the utility of this gene as an exposure biomarker. Analysis of cDNA sequence of MT gene demonstrated high conformity with those of other fish. MT messenger RNA (mRNA) expression and enzymatic MT content significantly increased following CdCl2 exposure in a concentration-dependent manner. The level of CdCl2 that resulted in significant MT changes in Z. platypus was within the range that was reported from other fish. The MT gene of Z. platypus sequenced in the present study can be used as a useful biomarker for heavy metal exposure in the aquatic environment of Korea and other countries where this freshwater fish species represents the ecosystem.</P>
Kim, Jungkon,Kim, Younghee,Lee, Sangwoo,Kwak, Kyunghee,Chung, Wook-Jin,Choi, Kyungho Chapman Hall ; Kluwer Academic Publishers 2011 Ecotoxicology Vol.20 No.8
<P>We explored the use of molecular genetic biomarkers for endocrine disruption in Daphnia magna after the exposure to fenoxycarb (FOC), a model juvenile hormone analog. For this purpose, the mRNA expression patterns of DMRT93B (DMRT, sex determination), cuticle 12 (CUT, molting), and vitellogenin (VTG, embryo development) were determined in D. magna. Furthermore, these results were compared with developmental abnormality and reproduction performance. The fold changes of CUT and VTG mRNA expression showed significant dose-response relationship with FOC exposure. Relative mRNA expressions of DMRT and CUT showed notable changes at as low as 1 ng/l FOC. After chronic exposure FOC significantly delayed the first day of reproduction and decreased the number of young and growth rate even at 10 ng/l FOC. A concentration-dependant trend in reproduction effect was also observed. Developmental abnormality such as poorly developed second antennae and curved or unextended shell spines were observed. These results suggest that the three mRNAs, i.e., DMRT, CUT, and VTG can be used as biomarkers of endocrine disrupting effects in D. magna.</P>
Kim, Jungkon,Park, Yena,Lee, Sangwoo,Seo, Jihyun,Kwon, Dongwook,Park, Jaehong,Yoon, Tae-Hyun,Choi, Kyungho Korean Society of Environmental Health 2013 한국환경보건학회지 Vol.39 No.4
Objectives: This study was conducted to identify factors determining the toxicity of manufactured silver nano-particles (AgNPs) on aquatic organisms. Methods: For this purpose, we prepared several AgNPs with varied characteristics, including hydrodynamic size (nano-$^{ABC}Ag^{Cit}\;vs$-sized-$^{ABC}Ag^{Cit}$), impurities ($^{ABC}Ag$ stock vs $^{ABC}Ag$), and citrate capping ($^{ABC}Ag^{Cit}$), using a commercially available manufactured AgNP ($^{ABC}Ag$ stock). Acute tests were conducted using larval zebrafish (Danio rerioI). In addition, in order to determine the ecotoxicological potentials of various capping agents, toxicity tests were conducted with microbes, waterfleas, and fish for eight different capping agents that are used for NPs. Results: The toxicity of AgNPs in terms of 96 h fish $LC_{50}$ increased in the following order: $^{ABC}Ag$ stock < $^{ABC}Ag=^{ABC}Ag^{Cit}=nano-^{ABC}Ag^{Cit}$ < ${\mu}$-sized-$^{ABC}Ag^{Cit}$ < $AgNO_3$. After removing impurities by dialysis, 96 h $LC_{50}$ value decreased significantly from $126.6{\mu}g/L$ (95% confidence intervals [CI]: 107.0-146.2) ($^{ABC}Ag$ stock) to $78.6{\mu}g/L$ (CI: 72.7-84.8) ($^{ABC}Ag$). For ${\mu}$-sized-$^{ABC}Ag^{Cit}$ (ranging between 3.9 and 40.6 nm) and $^{ABC}Ag^{Cit}$ (40.6 nm and $9.1{\mu}m$), the 96 h $LC_{50}$ of the former ($43.9{\mu}g/L$, CI: 36.0-51.7) was approximately two-fold lower than that of the latter ($87.0{\mu}g/L$, CI: 73.5-100.3). Conclusions: In this study, we found that for acute lethality, the contribution of impurities and particle size was significant, but that of citrate was negligible.
Jungkon Kim,Yena Park,Sangwoo Lee,Jihyun Seo,Dongwook Kwon,Jaehong Park,Tae-Hyun Yoon,Kyungho Choi 한국환경보건학회 2013 한국환경보건학회지 Vol.39 No.4
Objectives: This study was conducted to identify factors determining the toxicity of manufactured silver nanoparticles (AgNPs) on aquatic organisms. Methods: For this purpose, we prepared several AgNPs with varied characteristics, including hydrodynamic size (nano-ABCAgCit vs -sized-ABCAgCit), impurities (ABCAg stock vs ABCAg), and citrate capping (ABCAgCit), using a commercially available manufactured AgNP (ABCAg stock). Acute tests were conducted using larval zebrafish (Danio rerioI). In addition, in order to determine the ecotoxicological potentials of various capping agents, toxicity tests were conducted with microbes, waterfleas, and fish for eight different capping agents that are used for NPs. Results: The toxicity of AgNPs in terms of 96 h fish LC50 increased in the following order: ABCAg stock < ABCAg = ABCAgCit = nano-ABCAgCit < μ-sized-ABCAgCit < AgNO3. After removing impurities by dialysis, 96 h LC50 value decreased significantly from 126.6 μg/L (95% confidence intervals [CI]: 107.0-146.2) (ABCAg stock) to 78.6 μg/L (CI: 72.7-84.8) (ABCAg). For μ-sized-ABCAgCit (ranging between 3.9 and 40.6 nm) and ABCAgCit (40.6 nm and 9.1 μm), the 96 h LC50 of the former (43.9 μg/L, CI: 36.0-51.7) was approximately two-fold lower than that of the latter (87.0 μg/L, CI: 73.5-100.3). Conclusions: In this study, we found that for acute lethality, the contribution of impurities and particle size was significant, but that of citrate was negligible.
화학사고 장외영향평가 지원 프로그램(KORA)의 활용도 증대를 위한 제언
김정곤(Jungkon Kim),류지성(Jisung Ryu),류태권(Taekwon Ryu),곽솔림(Sollim Kwak),임형준(Hyeongjun Lim),최우수(Woosoo Choi),정진희(Jinhee Jung),이지은(Jieun Lee),임동연(Dongyeon Lim),윤준헌(Junheon Yoon) 한국환경보건학회 2018 한국환경보건학회지 Vol.44 No.2
Objectives: All enterprises intending to install and operate hazardous chemical handling facilities should prepare an off-site risk assessment (ORA) report that evaluates the impact of potential chemical accidents on the surrounding environment and population. This study was conducted to introduce the process of development and the functioning of the Korea Off-site Risk Assessment support tool (KORA) developed by the National Institute of Chemical Safety and to suggest manners to increase its utilization. Additionally, this article provided an overview of KORA. Methods: In order to identify problems with and refinements for KORA, the required items for each phase of KORA were derived by analyzing the Chemical Control Act and related administrative regulations. Results: The functions of KORA made receptor-considered assessment of chemical accidents possible, but several limitations were found in particular phases, such as the analysis of impact range, consideration of sensitive receptors, and assessment of environmental receptors. Conclusion: In this study, we suggested manners to increase the utilization of KORA. It is anticipated that the further research suggested in the study could contribute to the stabilization of the KORA system.
Ivermectin, praziquantel, tamiflu, triclosan의 환경위해성평가
류태권(Taekwon Ryu),김정곤(Jungkon Kim),김경태(Kyungtae Kim),이재우(Jaewoo Lee),김지은(Jieun Kim),조재구(Jaegu Cho),윤준헌(Junheon Yoon),이재안(Jaean Lee),김필제(Pilje Kim),류지성(Jisung Ryu) 한국환경보건학회 2018 한국환경보건학회지 Vol.44 No.2
Objectives: The purpose of this study was to assess environmental risk on the emerging contaminants of concern, such as ivermetin, parziquantel, tamiflu and triclosan. Furthermore, we tried to provide a more efficient management practice and a basis for future studies of risk assessment on those substances. Methods: Predicted no effect concentration (PNEC) and predicted environmental concentration (PEC) were determined through modeling and literature reviews. Environmental risk assessment was evaluated by calculating HQ (hazard quotient) by a comparison of PEC (or measured environmental concentration (MEC)) and PNEC. Results: HQ value of tamiflu calculated from MEC was 1.9E-03. For ivermectin and triclosan, the HQ values were not available because these were not detected in the aquatic environment. The toxicity of ivermectin and triclosan showed a very low value, indicating a high level of HQ. However, praziquantel can be categorized into the material that do not require management since they have less than HQ 1. Conclusion: Based on the results of the initial risk assessment, it is assumed that the ivermectin and triclosan have potential to cause direct adverse effects on the aquatic environment. To conduct an accurate environmental risk assessment, the further study on PEC estimation of such contaminants should be actively carried out.