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전사체와 대사물질 구조분석을 통한 Novosphingobium pentaromativorans US6-1의 dibenzofuran 분해 경로 해석
나혜윤,권개경,Na, Hyeyun,Kwon, KaeKyoung 한국미생물학회 2018 미생물학회지 Vol.54 No.1
다환 방향족 탄화수소(polycyclic aromatic hydrocarbon, PAH) 우수 분해균주인 Novosphingobium pentaromativorans US6-1의 dibenzofuran (DBF) 분해경로를 밝히기 위하여 중간대사물질 분석과 전사체 분석을 진행하였다. GC/MS로 중간대사물질을 분석한 결과, 3(2H)-벤조퓨라논이 검출되었는데 이 화합물은 측면 이산소화에 의해 생성된 중간대사산물들의 기본 골격이 되는 물질로써 균주 US6-1에 의한 DBF의 분해가 측면 이산소화로 진행될 가능성을 시사한다. RNA-Seq 분석 결과, 균주 US6-1이 DBF에 노출되었을 때 발현되는 유전자들의 대부분이 lateral dioxygenation과 관련이 있다는 것을 확인하였다. 이상의 결과로부터N. pentaromativorans US6-1에 의해 일어나는 측면 이산소화를통한 DBF 분해경로와 관련 유전자들을 제시하였다. Biodegradation pathway of dibenzofuran (DBF) of Novosphingobium pentaromativorans US6-1, a high-molecular-weight polycyclic aromatic hydrocarbons degrading strain, was investigated via analysis of metabolic intermediates and transcriptome. As a result, 3(2H)-benzofuranone, a basic skeleton of the metabolic intermediates produced by lateral dioxygenation process, was detected as an intermediate. RNA-Seq analysis confirmed that most of the expressed genes upon exposure to DBF were related to the lateral degradation pathway. Based on these results, the biodegradation pathway of DBF by N. pentaromativorans US6-1 was proposed.
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함유근,나혜윤,오설희 한국기상학회 2019 Asia-Pacific Journal of Atmospheric Sciences Vol.55 No.1
This study examines the active role of sea surface temperature (SST) over the Kuroshio Extension region during heavy rainfall events over the Korean Peninsula within Changma period (June–July). While the overall synoptic patterns during the heavy rainfall events over Korea are similar to those during moderate rainfall events (i.e. between 0.5 and 1 standard deviation), the synoptic signals preceding heavy rainfall events are distinct from those of moderate rainfall events. A distinguishing feature is the maintenance of a high-pressure anomaly over the Kuroshio Extension region, which lead to persistent southerly winds and resultant heavy rainfall events over the Korean Peninsula, from roughly 1 week before the start of heavy rainfall events. On the other hand, the high-pressure anomaly associated with the moderate rainfall events is propagated from the west along the climatological westerly winds. It was found that positive SST anomalies over the Kuroshio Extension region (140–156°E, 28–35°N) play an important role in maintaining the high-pressure anomaly over the Kuroshio Extension region. None of heavy rainfall events was found when the positive geopotential height anomaly over the Kuroshio Extension region was co-located with a local negative SST anomaly. This probability increased to 62% when the positive geopotential height anomaly was co-located with a local positive SST anomaly. This shows that a positive SST anomaly over the Kuroshio Extension region can be a useful precursor to heavy rainfall events over the Korean Peninsula.
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Marginal Sea Surface Temperature Variation as a Pre-Cursor of Heat Waves over the Korean Peninsula
함유근,나혜윤 한국기상학회 2017 Asia-Pacific Journal of Atmospheric Sciences Vol.53 No.4
This study examines the role of the marginal sea surface temperature (SST) on heat waves over Korea. It is found that sea surface warming in the south sea of Korea/Japan (122-138oE, 24- 33oN) causes heat waves after about a week. Due to the frictional force, the positive geopotential height anomalies associated with the south sea warming induce divergent flows over the boundary layer. This divergent flow induces the southerly in Korea, which leads to a positive temperature advection. On the other hand, over the freeatmosphere, the geostrophic wind around high-pressure anomalies flows in a westerly direction over Korea during the south sea warming, which is not effective in temperature advection. Therefore, the positive temperature advection in Korea due to the south sea warming decreases with height. This reduces the vertical potential temperature gradient, which indicates a negative potential vorticity (PV) tendency over Korea. Therefore, the high-pressure anomaly over the south sea of Korea is propagated northward, which results in heat waves due to more incoming solar radiation.
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조민철,김승호,나혜윤,김난희,조광운,배석진,이세행,Cho, Min-cheol,Kim, Seung-Ho,Na, Hye-Yun,Kim, Nan-Hee,Cho, Gwang-un,Bae, Seok-Jin,Lee, Se-Haeng 한국환경과학회 2022 한국환경과학회지 Vol.31 No.5
This study was conducted to propose a way to increase the accuracy and precision of 𝛽-ray measurement equipment. Statistical processing results of equivalent evaluation data from 2016 to 2021 confirmed that the concentration of micro dust measured by 𝛽-ray measurement equipment was higher than that of micro dust sampler. According to quarterly data, it was confirmed that the data from the third quarter (July to September) showed a different trend from other periods, which is assumed to be due to weather conditions. This study indicates that automatic micro-dust measurement equipment evaluation at air pollution measuring stations during the third quarter should be excluded. The evaluation cycle should be changed from once every two years to quarterly. In addition, when the criterion for determining equivalence evaluation falls within the range of the slope and intercept values of the existing trend line, it is necessary to evaluate the R<sup>2</sup> value together and reduce the slope from 0.9-1.1 to 0.9-1.0.
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광주지역 미세먼지(PM-10)의 다환방향족탄화수소 분포 특성 및 발생원 추정
김승호,박병훈,조민철,나혜윤,박원형,서광엽,이세행,주흥수 한국환경과학회 2023 한국환경과학회지 Vol.32 No.4
This study was conducted to investigate the distribution characteristics, source identification, and health risk of polycyclic aromatic hydrocarbons (PAHs) present in particulate matter 10 (PM-10), in Gwangju. PM-10 samples were collected from September 2021 to August 2022 from three sampling sites, one located in each of the following areas: green, residential, and industrial. The average concentrations of PAHs were found to be higher in the industrial area (9.75±6.51 ng/㎥) than in the green (6.90±2.41 ng/㎥) and residential (6.74±2.38 ng/㎥) areas. Throughout the year and across all sites, five-ring PAHs accounted for the largest proportion (29.8–34.5%) of all PAHs. The concentrations of PAHs showed distinct seasonal variations, with the highest concentration observed in winter, followed by autumn, spring, and summer. Source apportionment analyses were performed using diagnostic ratios and principal component analyses, which indicated that coal/biomass combustion and vehicle emissions were the primary sources of PAHs in PM-10. The incremental lifetime cancer risk was estimated for all age groups at all sampling sites, and the results revealed a much lower risk level than the standard acceptable risk level (1×10-6).
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