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Koh, Dong-Chan,Genereux, David P.,Koh, Gi-Won,Ko, Kyung-Seok Elsevier 2017 Chemical geology Vol.467 No.-
<P><B>Abstract</B></P> <P>Groundwater from pristine volcanic rock aquifers on dormant Jeju Island, Korea, was investigated to identify sources and geochemical processes of dissolved inorganic carbon (DIC) and related solutes along with characteristics of groundwater flow using a multi-isotope approach. δ<SUP>18</SUP>O, δ<SUP>2</SUP>H, and <SUP>3</SUP>H of groundwater indicated the water is of meteoric origin, and is mainly derived from recent recharge, except Na-rich mineral water which has a significant contribution of <SUP>3</SUP>H-free old water. <SUP>87</SUP>Sr/<SUP>86</SUP>Sr of dissolved Sr suggests that solutes in groundwater were mainly derived from old alkali basalt in the lower part of lava flows. δ<SUP>13</SUP>C<SUB>CO2(g)</SUB> calculated using δ<SUP>13</SUP>C<SUB>DIC</SUB> and measured hydrogeochemical parameters indicated that (1) biogenic soil CO<SUB>2</SUB> is a dominant source of DIC in low mineralized water, (2) CO<SUB>2</SUB>-rich water had mostly mantle-derived magmatic CO<SUB>2</SUB>, and (3) mineral water contained both biogenic and magmatic CO<SUB>2</SUB>. δ<SUP>13</SUP>C<SUB>CO2(g)</SUB> in mineral water was affected by precipitation of calcite, which complicated the estimation of the contribution of CO<SUB>2</SUB> sources to DIC. Concentrations of mobile elements were mainly controlled by the amount of magmatic CO<SUB>2</SUB> and groundwater residence time. δ<SUP>13</SUP>C<SUB>CO2(g)</SUB> and <SUP>3</SUP>H content were used to distinguish four types of groundwater with different spatial patterns of occurrence in relation to the volcanic stratigraphy of Jeju Island. Groundwater types I and II are low mineralized water with lower levels of DIC from biogenic CO<SUB>2</SUB>, composed of either recent recharge (<40years, type I) or older water with negligible <SUP>3</SUP>H (>60years, type II). Type III is Mg-rich mineral water with significant recent recharge while type IV is Na-rich mineral water with older residence time. Types III and IV had somewhat elevated levels of DIC (up to 7.6mM) with mixed signatures of magmatic and biogenic CO<SUB>2</SUB>, while CO<SUB>2</SUB>-rich water (a subset of type III) had DIC up to 100mM with signatures of mantle-derived magmatic CO<SUB>2</SUB>. Groundwater in the eastern area of Jeju Island is mostly type I, which can be attributed to a lack of both low-permeability rocks and recent volcanic rocks in that area. Types III and IV were found in the western area where the latest volcanic rocks are distributed. In the southwestern area, type III is associated with permeable basaltic aquifers with a contribution of magmatic CO<SUB>2</SUB> and type IV is from the younger lava flows dissected by older massive trachytic rocks and shallower hydrovolcanic tuffs, which led to the higher degree of mineralization. A conceptual model is proposed to integrate the chemical and isotopic constraints of groundwater with volcanic stratigraphy and suggest the processes that generated groundwater types with different residence times and chemical compositions. This study may contribute to understanding the processes of groundwater flow and mineralization in volcanic aquifers affected by deep-source CO<SUB>2</SUB> and variable residence time of groundwater in both dormant and active volcanic areas.</P>
( Gi Tark Noh ),( Kyoung Ju Lee ),( Hee Jung Sohn ),( Kyung Han Lee ),( Won Seok Heo ),( Byung Sung Koh ),( Un Mi Han ),( Young A Bae ) 영남대학교 의과대학 2016 Yeungnam University Journal of Medicine Vol.33 No.1
Pulmonary epithelioid hemangioendothelioma (PEH) is a rare, low-to-intermediate malignant tumor of endothelial origin. Computed tomography (CT) findings of PEH demonstrate multiple small bilateral nodules; however, to the best of our knowledge, there were no reports on PEH coexisting with other malignancies. Here, we reported on a case involving PEH in a patient with colon cancer and breast cancer which was misconceived as pulmonary meta- stasis. A 63-year-old woman who suffered from constipation for 2 weeks visited our hospital. Colonoscopy showed a large mass with obstruction on hepatic flexure. The histological diagnosis was adenocarcinoma of the ascending colon. Multiple nodules in both lungs and breast were observed on a chest CT scan. A core biopsy of a breast nodule was performed and a diagnosis of invasive ductal carcinoma of the left breast was made. Pulmonary nodules observed on the chest CT scan was considered as pulmonary metastasis from colon or breast cancer. Laparoscopic right hemicolectomy was performed. At the same time, wedge resection of the lung was performed and pathological diagnosis was PEH. Radiologic features of PEH were difficult to distinguish from lung metastasis. Therefore the author reported a rare case involving PEH in a patient with primary malignancy of colon and breast.
( Gi-beop Lee ),( Ji Won Lee ),( Se-hee Yoon ),( Won Min Hwang ),( Sung-ro Yun ),( Dong Hoon Koh ),( Yohan Park ) 대한신장학회 2024 Kidney Research and Clinical Practice Vol.43 No.4
Background: The reliability of presepsin as a biomarker of sepsis may be reduced in patients with acute kidney injury (AKI) requiring continuous kidney replacement therapy (CKRT). This study analyzed the utility of plasma presepsin values in predicting mortality in patients with AKI requiring CKRT, particularly those with sepsis-associated AKI. Methods: This single-center retrospective study included 57 patients who underwent CKRT, with plasma presepsin measurements, from April 2022 to March 2023; 35 had sepsis-associated AKI. The predictive values of plasma presepsin, as well as Acute Physiology and Chronic Health Evaluation II (APACHE II) and Sequential Organ Failure Assessment (SOFA) scores, for 28-day mortality were analyzed using receiver operating characteristic curves. Multivariate Cox regression analysis was performed to identify risk factors for 28-day mortality in the sepsis-associated AKI subgroup. Results: Overall, plasma presepsin showed a lower area under the curve value (0.636; 95% confidence interval [CI], 0.491-0.781) than the APACHE II (0.663; 95% CI, 0.521-0.804) and SOFA (0.731; 95% CI, 0.599-0.863) scores did. However, in sepsis-associated AKI, the area under the curve increased to 0.799 (95% CI, 0.653-0.946), which was higher than that of the APACHE II (0.638; 95% CI, 0.450-0.826) and SOFA (0.697; 95% CI, 0.519-0.875) scores. In the multivariate Cox regression analysis, a high presepsin level was an independent risk factor for 28-day mortality in sepsis-associated AKI (hazard ratio, 3.437; p = 0.03). Conclusion: Presepsin is a potential prognostic marker in patients with sepsis-associated AKI requiring CKRT.
고기원(Gi Won Koh),박준범(Jun Beom Park) 대한자원환경지질학회 2010 자원환경지질 Vol.43 No.1
이 연구는 한반도 최남단에 위치한 가파도와 마라도를 구성하는 용암류에 대한 40Ar-39Ar 절대연대 자료를 포함한 암석학적 특징을 보고하고 그 화산활동에 대해 고찰한다. 가파도의 용암류는 판상절리가 발달되어 있고 담황색 내지 담회색을 띠는 비현정질 부분과 진회색의 괴상질 부분으로 구분되는데, 암질에 따라 차별적 풍화 침식을 받았다. 한 편, 마라도의 용암류는 비록 용암단위별로 그 조직이 미약한 차이를 가지지만, 주로 다공질 혹은 취반상 조직의 용암 류이다. 시추코어의 지화학 자료는 가파공의 경우 현무암질 조면안산암(SiO2 52.6-53.6 wt%, Na2O+K2O 7.3-7.5 wt%) 이, 마라공은 솔리아이트질 안산암(SiO2 51.7-52.8 wt%, Na2O+K2O 3.6-4.1 wt%)으로 구성되어 있음을 지시한다. 가 파도 암류의 40Ar-39Ar 절대연대는 824±32 Ka에서 758±9 Ka로서, 인접한 산방산 조면암(Won et al., 1986)에 대비된 다. 한편, 마라도의 것은 259±168 Ka로서, 비록 오차 범위가 넓어 정확한 연대를 제시하지는 못하지만 인접한 덕수 공과 상모2호공에서의 암석 성분과 연대 관계를 고려하면 260-150 Ka기간 동안에 형성되었을 것으로 추정된다. 용암 류의 산상, 인접 시추공과의 대비 및 해수면하의 지형을 고려하면, 제주도 남서부 지역에서 가파도는 산방산 조면암 의 분출시기와 유사한 시기에 화산활동으로 한편, 마라도는 이후 260-150 Ka기간 동안 화산활동에 의해 각각 육상 환 경에서 독립된 화산체를 이루었으며, 이후 해침에 의해 침식이 많이 진행되어 현재의 형태를 이루었음을 지시한다. We report petrologic characteristics including 40Ar-39Ar absolute ages of the subsurface lavas recovered from borehole cores in two islets, Marado and Gapado, off the southwestern coast of Jeju in southernmost Korea and discuss on the volcanism in the region. The lavas in Gapado are apparently divided into one unit with bright colored, aphanitic texture and sheet jointed, and another unit with dark colored and massive. The outcrops often show differentially weathered pattern due to textural difference. While, the lavas in Marado have vesicular and glomerporphyric texture, even though each lava flow unit in Marado has slight unique texture with variation of vesicularity and phenocrysts. The chemical composition of rock core samples from Gapa borehole and Mara borehole shows that the lavas from Gapado and Marado are classified into basaltic trachyandesite(SiO2 52.6-53.6 wt%, Na2O+K2O 7.3-7.5 wt%) and tholeiitic andesite(SiO2 51.7-52.8 wt%, Na2O+K2O 3.6-4.1 wt%), respectively. The measured 40Ar-39Ar plateau ages range from 824±32 Ka(MSL -69 m) to 758±9 Ka(MSL 19 m) for core samples of Gapa borehole and 259±168 Ka(MSL -26 m) for a core sample of Mara borehole, respectively. The absolute age of Gapado basaltic trachyandesite is well correlated with that of Sanbangsan trachyte(Won et al., 1986). Meanwhile, the age of a sample in Marado has 259±168 Ka(MSL -26 m) with poor plateau age formation and high error range. We report the data in caution but the rock composition and absolute age of Marado tholeiitic andesite are relatively correlated with those of lava units from Duksu and Sangmo-2 boreholes, indicating the volcanism during 260-150 Ka. On the basis of interpretation of occurrences of exposed and subsurface volcanic rocks of the study area, stratigraphic relationship with adjacent borehole cores and the bathymetry chart of surrounding area, it indicates that the lavas in Gapado were formed around 800 Ka during relatively early stage of volcanic activity in Jeju Island. Meanwhile, Marado may have originated around 260-150 Ka during relatively young stage of volcanism in Jeju Island. It is inferred that the volcanisms have originated in land and these islets were individual ancient volcanoes. The apparent topography has been re-shaped by tidal erosion due to transgression.
( Hyun Gi Koh ),( Nam Kyu Kang ),( Eun Kyung Kim ),( William I. Suh ),( Won-kun Park ),( Bongsoo Lee ),( Yong Keun Chang ) 한국미생물생명공학회(구 한국산업미생물학회) 2019 Journal of microbiology and biotechnology Vol.29 No.6
Chlorella spp. are green algae that are found across wide-ranging habitats from deserts to arctic regions, with various strains having adapted to survive under diverse environmental conditions. In this study, two novel Chlorella strains (ABC-002, ABC-008) were isolated from a freshwater lake in South Korea during the winter season and examined for possible use in the biofuel production process. The comparison of ABC-002 and ABC-008 strains with Chlorella vulgaris UTEX265 under two different temperatures (10 ℃, 25 ℃) revealed their cold-tolerant phenotypes as well as high biomass yields. The maximum quantum yields of UTEX25, ABC- 002, and ABC-008 at 10 ℃ were 0.5594, 0.6747, and 0.7150, respectively, providing evidence of the relatively higher cold-resistance capabilities of these two strains. Furthermore, both the biomass yields and lipid content of the two novel strains were found to be higher than those of UTEX265; the overall lipid productivities of ABC-002 and ABC-008 were 1.7 ~ 2.8 fold and 1.6 ~ 4.2 fold higher compared to that of UTEX265, respectively. Thus, the high biomass and lipid productivity over a wide range of temperatures indicate that C. vulgaris ABC-002 and ABC-008 are promising candidates for applications in biofuel productions via outdoor biomass cultivation.