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이효원,Lee Dong Joon,임창수 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.9
Imaging and photodynamic therapy through two-photon excitation can be applied to medical application of deep inside the tissue by minimizing light absorption by the tissue. It is the best solution that can complement the shortcomings of conventional photodynamic therapy. In addition, auto-fluorescence can be minimized, and damage to normal cells can be avoided through spatial and temporal control. To maximize the image realization and the effect of treatment, a single photosensitizer with high fluorescence quantum yields, two-photon absorption value, and good 1 O2 or reactive oxygen species production performance must be developed. Therefore, recent research related to this topic is summarized. In addition, two-photon photosensitizers that approach selective imaging and treatment for target diseases and future challenges were discussed.
이효원,이윤영,Lee, Hyo Won,Lee, Youn Young Korean Chemical Society 1975 대한화학회지 Vol.19 No.1
2-Acetothienone과 chloral을 축합시켜 chloral-2-acetothienone을 생성하였으며 이것을 탈수하여 trichloroethylidene-2-acetohienone을 합성하였다. Trichloroethylidene-2-acetothienone과 phenylhydrazine 또는 치환된 phenylhydrazine들과의 반응으로 2-aryl-6-(2-thienyl)-3(2H)-pyridazinone들을 얻었으며 hydrazine과의 반응에서는 3-(2-thienyl)-5-trichloromethyl-2-pyrazoline이 합성되었다. Chloral-2-acetothienone was synthesized from the condensation of 2-acetothienone with chloral, and trichloroethylidene-2-acetothienone was obtained from the dehydration of chloral-2-acetothienone. From the reaction of trichloroethylidene-2-acetothienone with phenylhydrazine or substituted phenylhydrazines 2-aryl-6-(2-thienyl)-3(2H)-pyridazinones were obtained. 3-(2-Thienyl)-5-trichloromethyl-2-pyrazoline was synthesized from the reaction of trichloroethylidene-2-acetothienone with hydrazine hydrate.
솔보써말 방법을 이용한 구리분말 제조 및 전자파 차폐제로의 응용
이효원,김수룡,권우택,최덕균,김영희,Lee, Hyo-Won,Kim, Soo-Ryong,Kwon, Woo-Teck,Choi, Duck-Kyun,Kim, Young-Hee 한국재료학회 2006 한국재료학회지 Vol.16 No.5
Copper powders have been widely used in electrically conductive coatings, electrode materials et al. and are very prospective since they are cheaper than noble metal powders such as silver or palladium. In this study, copper powders for metal filler of EMI shielding have been prepared using a solvothermal process from $CuSO_4$, NaOH, Glucose, mixed solvent ($H_2O$: Ethanol) and hydrazine which was used as a reducing agent at various reaction conditions. The prepared copper powders showed finely dispersed spherical shape without agglomerate, uniform morphology, narrow size distribution, high purity and were about 400-700 nm in size. The prepared powders were characterized using XRD, SEM, TGA, XPS, particle size measurement and EMI shielding efficiency.
트리암시놀론이 배양된 사람 섬유아세포의 생존과 산화질소 생성에 미치는 영향
이효원,김재우,Hyo-Won Lee,Jae-Woo Kim 대한안과학회 2005 대한안과학회지 Vol.46 No.11
Purpose: To investigate the effect of triamcinolone acetonide (TA) on cell survival and nitric oxide (NO) production in cultured human Tenon`s capsule fibroblast (FB) cells. Methods: After exposed to TA, indomethacin, and dexamethasone for 2 days, cell survival and nitrite production of primarily cultured human FB cells were assessed with MTT and Griess assays, respectively. Results: Cell survival increased after exposure to TA at low concentrations but decreased at high concentrations. TA decreased the production of NO significantly (p<0.05). Exposure to indomethacin and dexamethasone revealed similar results. Conclusions: Both the biphasic effect on cell survival and the decreased production of NO induced by TA in FB cells could affect conjunctival wound healing
답리작 춘계포장에서 보리 및 이탈리안 라이그라스와 두과의 혼파비율이 동위원소 희석법 및 차이법을 이용한 질소고정 및 이동에 미치는 영향
이효원,이효진,김원호,윤봉기,고한종,Lee, Hyo-Won,Lee, Hyo-Jin,Kim, Won Ho,Yoon, Bong Ki,Ko, Han Jong 한국초지조사료학회 2016 한국초지조사료학회지 Vol.36 No.4
본 연구는 전남농업기술원 답리작 시험포장에서 2006년과 2007년 사이에 보리와 이탈리안 라이그래스와 각종 두과를 혼파비율을 달리한 처리하여 파종하였다. 주구는 보리 및 이탈리안 라이그래스와 자운영, 크림손클로버, 헤어리벳치, 사료용 완두였고 세구는 화본과와 두과를 각각 50:50, 60:40, 70:30 그리고 80:20이었다. 공중질소 고정량 및 이의 이동을 측정하기 위하여 질소동위원소($^{15}N(NH_4)_2SO_4$)를 2007년 4월 15일 처리 후 쿼드랏 안의 식물체를 6월 8일에 수확하여 화본과 및 두과로 분리한 후 안정성동위원소 질량분석기를 이용하여 분석하였다. 공중질소 고정률은 두과에서 화본과로, 질소이동은 차이법과 동위원소 희석법을 이용하여 구하였다. 본 실험결과의 주요내용은 동위원소 초과는 화본과에서는 차가 없었던 반면 보리와 두과와 혼파비율이 60:40인 처리에서 유의적인 차이가 있었다. 그 값은 보리와 혼파한 두과는 0에서 0.54 범위였다. 이탈리안 라이그래스와 두과 혼파에서는 초과 값이 더 높아 보리에서는 0.71에서 0.82, 두과는 0.37에서 1.01 사이였다. 공중 질소 이용비율은 보리와의 조합은 0%~49.5%, 이탈리안 라이그라스 조합은 0~60.5%의 범위로 다양한 결과를 나타내었다. 차이법에 의한 이동량 시험에서는 보리와의 조합에서 12.3~90.9 kg/ha, 이탈리안 라이그래스 조합에서는 보리보다 더 많아 31.7~107.8 kg 사이였다. 한편 동위원소 희석법에서는 보리와 두과 혼파조합은 0~36.1 kg/ha 그리고 이탈리안 라이그래스와 두과 혼파에서는 0~50.6 kg/ha로 이탈리안 라이그래스 조합이 더 많은 것으로 나타났다. 차이법에 의한 질소 이동량이 동위원소 희석법보다 더 많은 것으로 나타났다. In order to study the effect of barley, Italian ryegrass (IRG), and legume mixture on nitrogen fixation and transfer to grasses on spring paddy field, an experiment was carried out from Oct. 2006 to June 2007 in Naju, Korea. A split plot design with three replications was used for the experiment. One reference plot was assigned for each treatment to determine nitrogen fixation. Main plots consisted of Chinese milk vetch, crimson clover, forage pea, and hairy vetch with barley, respectively. Subplot treatment were barley or IRG with four seeding ratio of legumes (50:50, 60:40, 70:30, and 80:20). To estimate N fixation by legumes, $^{15}N$ isotope dilution technique was used. $^{15}N$ fertilizer [$(^{15}NH_4)_2SO_4$ solution at 99.8 atom N] was uniformly applied to $600cm^2$ in the middle of each plot on April 15, 2007. Plots were harvest by hand on June 8, 2007. Dried sample were ground to a fine power and analyzed for total N isotope N. $^{15}N$ was determined using elemental analyzer-isotope ratio mass spectrometry. The calculation of N transfer was determined with the isotope dilution method. The content of N was higher in legumes than that in barley or Italian ryegrass. Nitrogen level in forage pea was significantly higher than that of other legumes. There were significantly differences in N content between legumes in IRG mixture. Atom % $^{15}N$ excess was significantly different in legumes with barley. The 60:40 sub plot had higher (p<0.05) atom % $^{15}N$ than other seeding ratio treatments. The enrichment ranged from 0 to 0.58. Compared to barley, the enrichment of IRG with its accompanied legumes was higher, ranging from 0.38 to 1.0. The N derived from the atmosphere (Ndfa) ranged from 0% to 49.5% with barley-legume mixture. It ranged from 0 to 60.5% in IRG-legume plots. N transfer from legumes to neighboring grasses was 12.3 to 90.9 kg/ha for barley-legume mixture and 31.7 to 107.8 kg/ha for IRG plots. IRG plots showed higher N transfer for IRG-legume mixture in general based on difference method. Based on $^{15}N$ dilution method, the N transfer was 0 to 36.1 kg/ha for barley-legume mixture and 0 to 50.6 kg/ha for IRG plots. There was a tendency toward higher N transfer on the difference method than that of the $^{15}N$ dilution method.