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p-Nitrophenyl Chloroformate의 가에탄올 분해반응에 대한 속도론적 연구
손한일,경진범 한양대학교 이학기술연구소 2003 이학기술연구지 Vol.6 No.-
Acetone 용매 내에서 p-nitrophenyl chloroformate의 가에탄올 분해반응의 속도를 25.0℃에서 적정법에 의해 측정하였다. 측정된 반응속도상수로부터 초기에탄올 농도에 대한 실험적 2차 속도상수, k_(2)를 플로트한 결과 직선성이 좋음을 알 수 있었다. 이렇게 얻어진 속도론적 데이터로부터 p-nitrophenyl chloroformate의 속도식은 d[HCI]/ dt=k_(2)[p-NPC][EtOH]+ k_(3)[p-NPC][EtOH]^(2)임을 알았다. 그리고 활성화 엔탈피,ΔH^(≠)와 활성화 엔트로피, ΔS^(≠)를 구하였다. 이상의 결과로 acetone 용매 내에서 p-nitrophenyl chloroformate와 ethanol의 반응은 전체 반응에 대해 2차 반응과 3차 반응의 혼합 경쟁 반응인 이분자 첨가-제거 반응 메카니즘으로 진행됨을 알 수 있었다. The rates of ethanolysis of p-nitrophenyl chlorofonnate in acetone were measured using the titration method at 25.0℃ From these rate constants, plots of the experimental second-order rate constant, k_(2)^(≠) against the initial ethanol concentration were linear. From the kinetics data obtained, p-nitrophenyl chlorofonnate was found to be represented by d[HCI]/dt = k_(2)[p-NPC][EtOH] + k_(3) [p-NPC][EtOH]^(2). The values of activation enthalpy and entropy for the ethanolyses of p-nitrophenyl chlorofonnate was determined from the rate constants measured at various temperatures.? From these results, the reaction of these substrates with ethanol in acetone was mixed second-and third-order reaction for over-all reaction. and it could be estimated that this reaction has bimolecular addition-elimination mechanism.
Son, Young-Jin,Park, Kyong-Hee,Lee, Sang-Yong,Oh, Sung-Jin,Kim, Chang-Kyu,Choi, Byoung-Taek,Park, Yong-Cheol,Seo, Jin-Ho Korean Society for Biotechnology and Bioengineerin 2007 Biotechnology and Bioprocess Engineering Vol.12 No.5
Preproinsulin is a well-known precursor of human insulin for the regulation of blood glucose levels. In this study, fed-batch fermentations of recombinant Eschericha coli JM109/pPT-MRpi were carried out for the overexpression of human preproinsulin. The expression of human preproinsulin was controlled by the temperature inducible P2 promoter. The time-course profiles of fed-batch fermentation and SDS-PAGE analysis showed that human insulin expression was triggered by a culture temperature change from 30 to $37^{\circ}C$. Fermentation shift strategies, including the multi-step increase of temperature and the modulation of initiation time, were optimized to obtain high titers of cell mass and preproinsulin. The optimized fed-batch fermentation, consisting of a three-step shift of culture temperature from 30 to $37^{\circ}C$ for 2 h, gave the best results of 43.1 g/L of dry cell weight and 33.3% preproinsulin content, which corresponded to 2.0- and 1.2-fold increases, respectively, as compared to those of fed-batch culture at a constant temperature of $37^{\circ}C$.
Soil Microbial Communities and Growth of Sweet Potato(Ipomoea batatas L.) in Paddy and Upland Soils
Jin-Young Moon,Chang-Hee Son,Kyong-Hee Joung,Young-Gwang Kim,Young-Ho Chang,Dal-Yeon Choi,Hyeon-Ji Cho,Jae-Young Heo,Young Han Lee 한국토양비료학회 2020 한국토양비료학회지 Vol.53 No.2
The soil microbial communities and growth of sweet potato are often affected by soil type. This study evaluated the variations in microbial communities of paddy and upland soils used for two sweet potato cultivars (Jinhongmi and Sinjami) cultivation by their fatty acid methyl ester (FAME). The pH, available P2O5, exchangeable K, Ca, and Mg of upland soil at the harvesting stage were significantly higher than those of paddy soil. The moisture content of paddy soil (28.5%) has increased by 6.7% as compared to upland soil (p < 0.001). The average microbial biomasses in paddy soil were approximately 2.8 times larger for arbuscular mycorrhizal fungi (AMF) and 1.4 - 1.6 times larger for fungi, total bacteria, Gram-positive bacteria, total FAMEs, Gram-negative bacteria, and actinomycetes. In addition, The total FAMEs, Gram-positive bacteria, fungi, total bacteria, and AMF in Jinhongmi cultivated soils were significantly larger than those in Sinjami cultivated soils. AMF communities in paddy soil showed significantly larger than that in upland soil (p < 0.001) indicating AMF are potentially responsible for the microbial community differentiation between paddy and upland field. The tuber yield of sweet potato was 28% higher, respectively, in the paddy soil and Sinjami treatment than in the upland soil and Jinhongmi treatment. It was confirmed that the paddy field was more effective on the productivity of sweet potato and soil microbial biomass.
Jin Mei Hua,Tae Chul Moon,Tae Gyun Hong,Kyong Min Park,Jong Keun Son,장현욱 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.5
5-Methoxy-8-(2-hydroxy-3-buthoxy-3-methylbutyloxy)-psoralen (MP) is a medicinal herbal product isolated from Angelica dahurica that inhibits the cyclooxygenase-2 (COX-2)-dependent phase of prostaglandin D2 (PGD2) generation in bone marrow-derived mast cells (IC50, 23.5 μM). Western blotting with specific anti-COX-2 antibodies showed that the decrease in PGD2 production was accompanied by a decrease in COX-2 protein levels. In addition, this compound consistently inhibited the production of leukotriene C4 in a dose dependent manner, (IC50, 2.5 μM). These results demonstrate that MP inhibits both cyclooxygenase-2 and 5- lipoxygenase activity. Furthermore, this compound also inhibited the degranulation reaction (IC50, 4.1 μM). Therefore, this compound might provide a basis for novel anti-inflammatory drug development.
孫晋式,車慶煥,李鍾吉,李炳孝 中央醫學社 1971 中央醫學 Vol.20 No.1
From July 1968 to June 1970, in 3rd. army hospital, authors studied statistical consideration of 37 cases of spinal cord injuries including the causes and sites of the injuries, neurological findings on admission, interval from injuries to operation, operative findings complications, and prognosis. Thirty two of thirty seven cases were operated, but the others were treated non-surgically. Eighteen of 23 cases had complete motor and sensory loss on admission, which were operated, but not show any signs of improvement. Five of 37 cases had excellent recovery. One of five non-operated cases with complete paraplegia on admission did not show any remission despite continuous treatment. The other four cases with incomplete paraplegia on admission showed slight improve after treatment.
Kyong-Hoon Choi,Eun-Wook Choi,Jeeeun Min,Hyungbin Son,Han Sup Uhm,Eun HaChoi,Bong Joo Park,Jin-Seung Jung IEEE 2014 IEEE transactions on magnetics Vol.50 No.11
<P>In this paper, we have synthesized multifunctional magnetic particles (MNPs) using by two different ferrite submicrometer paticles (Fe<SUB>3</SUB>O<SUB>4</SUB>@HP and CoFe<SUB>2</SUB>O<SUB>4</SUB>@HP) with different surface properties. Two different multifunctional particles have the same particle sizes within the error tolerance of 4.5%. The concentration measurement of the hematoporphyrin (HP) molecule indicates that the weight of HP molecules bonded to the surface of the Fe<SUB>3</SUB>O<SUB>4</SUB> particles is smaller than that of the CoFe<SUB>2</SUB>O<SUB>4</SUB> particles. Moreover, we have evaluated their biocompatibilities and photodynamic anticancer activities on mammalian cells. The two MNPs have demonstrated that they both have good biocompatibilities without any cytotoxicity and anticancer activities in the concentration range of 0-50 μg/mL. Specifically, photodynamic-killing activities of both MNPs were measured to be 100% for CoFe<SUB>2</SUB>O<SUB>4</SUB>@HP, and were measured to be 37.9 ± 3.5% and 9.2 ± 2.5% for Fe<SUB>3</SUB>O<SUB>4</SUB>@HP in 25 and 50 μg/mL of both MNPs. These results suggest that both MNPs can be safely used to for clinical photodynamic cancer therapy, although the CoFe<SUB>2</SUB>O<SUB>4</SUB>@HP showed a slightly better photo-killing efficacy compared with the Fe<SUB>3</SUB>O<SUB>4</SUB>@HP in prostate cancer.</P>
Acrylic Resin에 의한 두개골 성형수술에 대한 고찰
손진식,안길수,차경환,이종길,최일룡,이병효 中央醫學社 1971 中央醫學 Vol.20 No.2
Since March, 1965 to March, 1970, authors had statistical consideration of cranioplasty with acrylic resin and iliac bone in 216 cases, and resulted as follows. 1. The causes of head trauma were traffic accident in 90 cases (41.6%), explosive in 66cases (30.60), and gun shot wound in 32 cases (14.8%) 2. The sites of skull defect were frontal bone in 72 cases (31.4%), temporal in 68 cases(29.6%), parietal in 62 cases (26.9%) and occipital in 10 cases (4.3%) 3. The interval from injuries to cranioplasty were within 3 months in 14 cases (6. 5%), 3-6months in 135 cases (62.5%) and over 6 months in 67 cases (31%). 4. Post operative complications were 5 cases (2.3%). 5. The sizes of defect in 36 cases were within 3cm in diameter, and 98 cases (38%) in 3-5 cm. and over 5cm. in 82 cases (28%). 6. The material of cranioplasty were acrylic resin in 198 cases (91. 6%), iliac bone in 18 cases (8.4%).