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( Gun Hee Son ),( Ji Young Kim ),( Maria John Muthaiya ),( Sa Rah Lee ),( Hyang Yeon Kim ),( Choong Hwan Lee ) 한국미생물 · 생명공학회 2011 Journal of microbiology and biotechnology Vol.21 No.11
Xanthomonas oryzae causes rice bacterial blight, which has been reported as one of the most destructive diseases of rice. Metabolites were identified through cheonggukjang, a traditional Korean fermented soybean product fermented by the Bacillus spp., to control the bacteria. HPLC, MS, and UPLC-Q-TOF-MS analyses were performed to identify metabolites responsible for antimicrobial activity. In this analysis, the m/z values of 253.0498, 283.0600, 269.0455, 992.6287, and 1,006.6436 were identified as daidzein, glycitein, genistein, surfactin B, and surfactin A, respectively. The levels of surfactin B and surfactin A were found to be high at 24 h (4.35 μg/ml) and 36 h (3.43 μg/ml) of fermentation, respectively.
정수처리 공정에서 용존 유기물질 분류에 의한 haloacetic acid 생성능 평가
손희종 ( Hee Jong Son ),황영도 ( Young Do Hwang ),류동춘 ( Dong Choon Ryu ),정철우 ( Chul Woo Jung ),이건 ( Gun Lee ),손형식 ( Hyeng Sik Son ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.9
A comprehensive fractionation technique was applied to a set of water samples obtained along drinking water treatment process with ozonation and biological activated carbon (BAC) process to obtain detailed profiles of dissolved organic matter (DOM) and to evaluate the haloacetic acid (HAA) formation potentials of these DOM fractions. The results indicated that coagulation-sedimentation-sand filtration treatment showed limited ability to remove hydrophilic fraction (28%), while removal of hydrophobic and transphilic fraction were 57% and 40%, respectively. And ozonation and BAC treatment showed limited ability to remove hydrophobic fractions (6%), while removal of hydrophilic and transphilic fractions were 25% and 18%. The haloacetic acid formation potential (HAAFP)/dissolved organic carbon (DOC) of hydrophilic fraction was the highest along the treatment train and HAAFP/DOC of hydrophilic fraction was higher than hydrophobic and transphilic fraction as 23%∼30%, because of better removal for hydrophobic fraction both in concentration and reactivity.
A Study on the Prediction of Stock Return in Korea’s Distribution Industry Using the VKOSPI Index
Jeong-Hwan LEE, Gun-Hee LEE, Sam-Ho SON 한국유통과학회 2023 유통과학연구 Vol.21 No.5
Purpose: The purpose of this paper is to examine the effect of the VKOSPI index on short-term stock returns after a large-scale stock price shock of individual stocks of firms in the distribution industry in Korea. Research design, data, and methodology: This study investigates the effect of the change of the VKOSPI index or investor mood on abnormal returns after the event date from January 2004 to July 2022. The significance of the abnormal return, which is obtained by subtracting the rate of return estimated by the market model from the rate of actual return on each trading day after the event date, is determined based on T-test and multifactor regression analysis. Results: In Korea’s distribution industry, the simultaneous occurrence of a bad investor mood and a large stock price decline, leads to stock price reversals. Conversely, the simultaneous occurrence of a good investor mood and a large-scale stock price rise leads to stock price drifts. We found that the VKOSPI index has strong explanatory power for these reversals and drifts even after considering both company-specific and event-specific factors. Conclusions: In Korea’s distribution industry-related stock market, investors show an asymmetrical behavioral characteristic of overreacting to negative moods and underreacting to positive moods.
Charge transfer in graphene/polymer interfaces for CO2 detection
Son, Myungwoo,Pak, Yusin,Chee, Sang-Soo,Auxilia, Francis Malar,Kim, Kihyeun,Lee, Byung-Kee,Lee, Sungeun,Kang, Sun Kil,Lee, Chaedeok,Lee, Jeong Soo,Kim, Ki Kang,Jang, Yun Hee,Lee, Byoung Hun,Jung, Gun- Springer-Verlag 2018 NANO RESEARCH Vol.11 No.7
Son, Seung Hyun,Jeong, Shin Young,Chong, Gun Oh,Lee, Yoon Hee,Park, Shin-Hyung,Lee, Chang-Hee,Hong, Chae Moon,Jeong, Ju Hye,Lee, Sang-Woo,Ahn, Byeong-Cheol,Lee, Jaetae Lippincott 2018 Clinical nuclear medicine Vol.43 No.9
PURPOSE: Cervical cancer may recur after concurrent chemoradiotherapy (CCRT), even in patients with metabolic complete response (mCR) on post-CCRT F-FDG PET. We retrospectively analyzed the value of metabolic parameters, measured by pretreatment PET, as prognostic factors for predicting recurrence and death in cervical cancer patients with mCR. METHODS: In 61 patients who reached mCR on post-CCRT, metabolic PET parameters including SUVmax, metabolic tumor volume (MTV), and total lesion glycolysis (TLG) of the primary tumors, as well as those of the metastatic lymph nodes, were measured by pre-CCRT PET. Total MTV and total TLG were also measured from primary tumors and metastatic lymph nodes. Survival analyses for disease-free survival (DFS) and overall survival (OS) were performed. RESULTS: Eleven patients (18.0%) presented with recurrence of cervical cancer, and 12 (19.7%) died during follow-up. SUVmax, MTV, TLG of metastatic lymph nodes, and total TLG could significantly predict DFS, and nodal SUVmax could predict OS. Para-aortic lymph node metastasis also significantly correlated with both DFS and OS. In multivariate analysis, nodal SUVmax and para-aortic lymph nodes metastasis were prognostic factors for DFS, and the best predictor was nodal SUVmax. For OS, nodal MTV and para-aortic lymph node metastasis were significant prognostic factors in multivariate analysis, and the best predictor was para-aortic lymph node metastasis. CONCLUSIONS: Metabolic PET parameters, SUVmax or MTV values of metastatic lymph nodes, may be surrogate prognostic markers for recurrence or death in patients with locally advanced cervical cancer who reached mCR after definitive CCRT.
손준호,정명근,최희진,張云彬,배종호,이희덕,최청 한국농화학회 2002 Applied Biological Chemistry (Appl Biol Chem) Vol.45 No.3
한국산 검정콩 종피의 천연색소로의 이용가능성을 알아보기 위하여 온도, 당류, 유기산류, 비타민 C 그리고 금속 이온의 영향을 살펴보았다. 검정콩 색소의 열안정성은 다른 안토시아닌 계열의 색소와 비교할 ?? 유사하거나 더 안정한 것으로 나타났다. 당류의 영향에서는 타 색소와는 달리 농색화 현상은 일어나지 않았고 저장성에서는 모두 포도당에서 양호하였다. 유기산에서는 모든 첨가구에서 색의 강도가 증가하였으며 비타민 C 첨가의 경우 안토시아닌 색소에 부정적인 영향을 나타내었고 금속이온의 영향에서는 Cu^2+와 Zn^2+이온에서 안정하였으며 Mn^2+에서는 불안정하였다. 이상의 결과를 종합해 볼 때 검정콩 종피색소는 ph 3에서 다른 색소와 비교하여 상당히 안전한 색소임을 알 수 있었다. To examine utilization of Korean black soybean as a natural pigment, the effects of temperature, carbohydrate, organic acid, vitamin C and metal ion were investigated. Korean black soybean pigment was more stable than other anthocyanin pigments when temperature was abused. There was no darkness effect in carbohydrate.In organic acid, the color intensity was increased. The vitamin C addition negatively affected on color of anthocyanin. Among the metal ions tested, Cu^2+ and Zn^2+ was nor affected but Mn^@+ makes it unstable. Results indicate that Korean black soybean pigment was more stable than other anthocyanin pigment in various environment at pH 3.
곰취(Ligularia fischeri), 미역취(Solidago virga-aurea), 삼나물(Aruncus dioicus) 복합 추출물의 항염증 효과
Dong-Hee Kim(김동희),Bong-Jeun An(안봉전),Se-Gie Kim(김세기),Tae-Soon Park(박태순),Gun-Hye Park(박근혜),Jun-Ho Son(손준호) 한국생명과학회 2011 생명과학회지 Vol.21 No.5
본 연구에서는 울릉도 특산 약용 작물 추출물이 항염증에 대한 실험연구가 이루어져 있지 않은 것에 착안하여 LPS에 의해 활성화된 대식세포로부터 유도되는 염증반응에 대한 억제효과를 조사하였다. 울릉도 자생 식물인 곰취, 미역취, 삼나물의 세가지 식물 추출물을 이용하여 피부 염증에 대하여 연구를 하였다. 산화질소와 cytokine의 생산은 면역세포의 대표적인 염증인자이다. 세포는 LPS 처리 후 한 시간 뒤에 곰취, 미역취, 삼나물 70% 아세톤 추출물을 처리를 하였다. 세포 독성이 나타나지 않는 농도인 1, 10, 100 ㎍/㎖를 사용하였다. 곰취, 미역취, 삼나물 70% 아세톤 추출물은 NO, PGE₂, TNF-α, IL-1β, IL-6, iNOS, COX-2의 생성을 저해 시켰다. PGE2는 100㎍/㎖의 농도에서 60%에 가까운 저해율을 나타내었다. iNOS와 COX-2 역시 100 ㎍/㎖의 농도에서 각각 54%, 65%가 저해가 되었다. 게다가 곰취, 미역취, 삼나물 70% 아세톤 추출물은 염증성 사이토 카인인 TNF-α, IL-1β, IL-6의 생성을 감소 시켰다. 이러한 결과로 곰취, 미역취, 삼나물 추출물은 염증 예방과 치료에 효과적임을 확인할 수 있었다. The objective of this study was to evaluate the skin inflammation effects of three herb mixture extracts, Ligularia fischeri, Solidago virga-aurea and Aruncus dioicus, which are from Ullung island in Korea. Regulatory mechanisms of cytokines and nitric oxide (NO) are involved in the immunological activity of Raw 264.7 cells. Tested cells were pretreated with 70% acetone extracts of Ligularia fischeri, Solidago virga-aurea and Aruncus dioicus (LSA-A) and further cultured for an appropriated time after lipopolyssacharide (LPS) addition. During the entire experimental period, 1, 10, and 100 ㎍/㎖ of LSA-A had no cytotoxicity. In these concentrations, LSA-A inhibited the production of NO and prostaglandin E₂ (PGE₂), tumor necorsis factor-a (TNF-a), interleukin-1β (IL-1β), interleukin-6 (IL-6) expression of inducible NO synthase (iNOS), and cyclooxygenase-2 (COX-2). LSA-A showed a 60% PGE₂ inhibition rate at 100 μg/ml. iNOS and COX-2 inhibition activities were 54%, and 65% at 100 ㎍/㎖, respectively. In addition, LSA-A extract reduced the release of inflammatory cytokines including TNF-a, IL-1β and IL-6. These results suggest that LSA-A may have significant effects on inflammatory factors, and may be a potential anti-inflammatory therapeutic agent.