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장향동,백광균,구경림,옥선미,최진석,고은주,류성렬 한국공업화학회 2004 응용화학 Vol.8 No.2
Aflatoxin B₁ was known to have the strongest poisonous character among Aflatoxin compounds. To search the production of Aflatoxin B1 according to the change of temperature, relative humidity and incubation days, orange incubated with Aspergillus parasiticus KCCM 35078 was incubated at 20℃, 25℃, 30℃ at relative humidity 60%, 70%, 80% and for incubation time 3, 4, 5, 6, 7 days.. Production of Aflatoxin B₁ shows that the highest production appeared at 25℃ and its relative humidity 70%. The result that was quantitatively analyzed by using HPLC was 77.41ppm, and by using Fluoroscence detector was 87.87ppm. - Production of Aflatoxin B₁ shows that the lowest production appreared at 20℃ and its relative humidity 80%(HPLC), 60%(Fluoroscence detector). The result that was quantitatively analyzed by using HPLC was 4.47ppm, and by using Fluoroscence detector was 4.17ppm. The structure of Aflatoxin B₁ was identify with authentic sample by using instrumental analysis methods of GC/MS, ¹H-NMR, FT-IR respectively.
Jang, Gwang Seok,Lee, Junggeun,Seo, Jungseok,Woo, Sang Kook American Chemical Society 2017 ORGANIC LETTERS Vol.19 No.23
<P>A method for [3 + 2] cycloaddition of oxaziridines with alkynes to form 4-isoxazolines via visible-light photoredox catalysis is described. This method is a greener, atom-economical reaction that tolerates various functional groups and provides good to excellent yield. Moreover, the cyclization products can be conveniently converted into tetrasubstituted allylic alcohols and enamines. A mechanistic study suggests that the reaction involves photoredox-catalyzed in situ generation of a nitrone from the oxaziridine by SET.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/orlef7/2017/orlef7.2017.19.issue-23/acs.orglett.7b03369/production/images/medium/ol-2017-03369g_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ol7b03369'>ACS Electronic Supporting Info</A></P>
( Gwang Hyeon Choi ),( Eun Sun Jang ),( Young Seok Kim ),( Youn Jae Lee ),( In Hee Kim ),( Sung Bum Cho ),( Han Chu Lee ),( Jang Jeong Won ),( Moran Ki ),( Hwa Young Choi ),( Dahye Baik ),( Sook-hyang 대한간학회 2020 춘·추계 학술대회 (KASL) Vol.2020 No.1
Aims: This study aimed to elucidate the all-cause mortality and the incidence hepatocellular carcinoma (HCC), and their related factors among the patients with chronic hepatitis C virus (HCV) infection in South Korea. Methods: A total 2,369 patients with HCV RNA positivity and no HCC at diagnosis (mean age 57.5 years, 47.6% male, 29.8% cirrhosis) were prospectively enrolled in 6 university hospitals from May 2007 to March 2019 and followed until February 2020. The patients were classified into untreated group (n=753, 31.8%), interferon (IFN)-based treated group (n=698, 29.5%), and direct-acting antivirals (DAA)-treated group (n=918, 38.8%). Kaplan-Meier curve analysis and Cox regression analysis were performed. Results: During 4.3 years (IQR 2.5-7.6) of median follow-up, 245 patients died and 147 developed HCC. The 3-, 5-, and 10-year cumulative mortality in the HCV patients was 4.6%, 8.0%, and 12.8%, respectively. The 3-, 5-, and 10-year cumulative incidence of HCC was 4.5%, 8.5%, and 18.3%, respectively. The SVR rate was 68.7% in IFN-based treated group and 95.2% in DAA-treated group, by per-protocol analysis. After multivariate analysis, achievement of SVR was an independent factor for decreased risk of HCC (adjusted hazard ratio [aHR] 0.22, 95% confidence interval [CI] 0.12-0.39, P<0.001 for IFN based-treated group and aHR 0.29, 95% CI 0.17-0.50, P<0.001 for DAA-treated group, respectively). SVR was an independent factor for decreased risk of all cause of mortality (aHR 0.27, 95% CI 0.17-0.44, P<0.001 for IFN based-treated group and aHR 0.23, 95% CI 0.12-0.45, P<0.001 for DAA-treated group, respectively) along with other factors. Conclusions: In Korea HCV cohort, 5-year cumulative incidence of HCC and mortality was 8.0% and 8.5%, respectively. The overall treatment rate was 70% with overall SVR rate of 86%. Achievement of SVR was a strong factor for better outcomes, which support active screening and treatment of HCV infection.
울산화력 5호기 보일러 공기예열기 정지 전후 성능변화 비교
장석원(Jang Seok Won),김광홍(Kim Gwang Hong) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.10
This paper describes test results of the air-preheater performance changes before & after the power plant overhaul, To see the performance changes, performance modelling, performance items & calculation methods are needed. At the reference of ASME PTC, we can get the detailed performance index of boiler air-preheater. By calculating the performance items before & after maintenance work, and comparing their performance changes, we confirmed air-preheater performance reliabilities and its conditions.