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광주지역 영산강 내 식물플랑크톤의 계절적 변동과 남조류 독소합성유전자의 계통발생학적 특성
김하람,조광운,손경록,장동,서광엽,김연희,Haram Kim,Gwangwoon Cho,Gyeongrok Son,Dong, Jang,Gwangyeob Seo,Yunhee Kim 한국환경과학회 2023 한국환경과학회지 Vol.32 No.5
Cyanobacteria have been used as pollution indicator species in freshwater ecosystems, and identifying their fluctuations can be an important part about management of surface waters globally. Cyanotoxins produced by cyanobacteria are directly or indirectly a threat to human and environmental health. In order to confirm the potential risk of these cyanotoxins, the fluctuations of phytoplankton and phylogenetic analysis of cyanotoxin synthetase genes were conducted at each point in the Yeongsan River water system in Gwangju from November 2021 to October 2022. Diatoms which grow well in winter were dominant at 99.4 ~ 99.5%, and diatoms and green algae were dominant from the spring to autumn when the water temperature rises. Stephanodiscus spp. were dominant at 92.7 to 97.5 % at all sites in the winter, and Aulacoseira spp., which grow in warm water temperatures, were dominant in summer and autumn. Microcystis aeruginosa was dominant at 25.2% in summer only at site 5. mcyB and anaC have been detected as cyanotoxin synthetase genes. The phylogenetic tree of anaC could be divided into two groups (Group 1 & Group 2). Group 1 contained Aphanizomenon sp. and Cuspidothrix issatschenkoi. It is combined with Aphanizomenon sp. and Cuspidothrix issatschenkoi, which are known to produce cyanotoxins.
광주지역 신축아파트의 휘발성유기화합물 및 카보닐화합물 특성에 관한 연구
김환기(Hwangi Kim),안상수(Sangsu Ahn),박옥현(Okhyun Park),김민진(Minjin Kim),이우진(Woojin Lee),박세일(Seil Park),배석진(Seokjin Bae),서광엽(Gwangyeob Seo) 한국생활환경학회 2021 한국생활환경학회지 Vol.28 No.2
Numerous volatile organic compounds are generated in new apartments. Only six volatile substances are regulated under the Indoor Air Quality Management Act for new apartments. Various other substances are not regulated despite their potential health risks. We investigated 43 types of volatile organic compounds and 7 types of carbonyl compounds which are representative indoor environmental pollutants in new apartments, and 21 types of pollutants were detected. Of the 21 types detected, 91.6 percent accounted for the majority of the 7 species with high concentrations. These seven typical indoor pollutants include regulators Toluene, Formaldehyde, Ethyl-benzene, Xylene, and Styrene, as well as unregulated substances Acetone and Acetaldehyde. The correlation analysis among seven volatile organic compounds was investigated. For the correlation of seven species, the strongest positive correlation between Ethyl-benzene and Styrene r=.933 (p=.001) appeared, and a coefficient of determination(r) between other species was greater than 0.7. This correlation coefficient values indicated that several volatile organic compounds released from the same pollutant sources. Additionally the concentration reduction rate of volatile organic compounds was measured to examine the Bakeout effect. The reduction rate scored as Toluene 85.5%, Xylene 84.7%, Ethyl-benzene 84.4%, Styrene 76.8%, Acetone 73.4%, Acetaldehyde 71.0%, and Formaldehyde 70.9% respectively.