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고분자에 결합된 금속-프탈로시아닌의 과산화수소수 분해반응에 대한 촉매활성
김공수,전용철,이영우,이상호,KimKong Soo 김공수,Yong Chul Chun,Young Woo Lee,Sang Ho Lee 대한화학회 1989 대한화학회지 Vol.33 No.6
Metal-4,4',4",4"'-tetraaminophthalocyanine [Mt-$PcNH_2$, Mt = Fe(III), Co(II), Ni(II), Cu(II)] 및 Mt-$PcNH_2$가 styrene-methacrylic acid 공중합체(STMA)에 고정화된 Mt-PcSTMA를 촉매로 사용한 불균일 수용액계에서 과산화수소의 분해반응에 대한 촉매활성에 대하여 실험하였다. 이 촉매들은 효소반응과 비슷한 촉매활성을 나타내었고, Fe(III)-$PcNH_2$이 공중합체에 결합되어 고정화된 Fe(III)-PcSTMA가 가장 촉매활성이 우수하였다. 분해반응율은 높은 pH 범위에서 증가하였으며, $CN^-,\;CNS^-,\;{C_2O_4}^{-2},\;I^-$ 등의 공존 음이온의 영향을 받았다. 또한, 반응속도론적인 고찰을 통하여 열역학적 특성값을 구한 결과로부터 촉매반응이 Michaelis-Menten형의 반응기구로 진행됨을 알 수 있었다. The decomposition reaction of hydrogen peroxide was carried out by using metal-4,4',4",4"'-tetraaminophthalocyanine [Mt-$PcNH_2$, Mt = Fe(III), Co(II)] supported on poly (styrene-co-methacrylic acid), in heterogeneous aqueous system. These catalysts showed a catalse-like activity and Fe(III)-$PcNH_2$ supported on the copolymer was particularly effective for the decomposition of hydrogen peroxide. It was found that the rate of decomposition increased smoothly in the higher pH region and catalytic reaction was interfered by adding $CN^-,\;CNS^-,\;{C_2O_4}^{-2},\;I^-$ ions. The kinetics of the catalytic reaction was also investigated and the reaction proceeds according to the Michaelis-Menten type mechanism.
스틸렌 - 아크릴산계 공중합체의 금속착물 형성에 관한 연구
김공수,김수종,조석형,전용철 ( Kong Soo Kim,Soo Jong Kim,Suk Hyeong Cho,Yong Chul Chun ) 한국공업화학회 1991 공업화학 Vol.2 No.1
수용성 poly(sulfonated styrene-co-acrylic acid)를 합성하여 Cu(II)이온과의 착물형성에 관한 연구를 수행하였다. poly(sulfonated styrene-co-acrylic acid)-Cu(II)착물의 생성반응에 있어서 pH 변화에 따른 UV-Vis.흡수 스펙트라 및 점도 특성을 시험하여 착물형성조건을 검토하였다. 또한, poly(sulfonated styrene-co-acrylic acid)-Cu(II) 착물의 생성상수와 안정도상수를 Bjerrum 방법으로 구하였고 Ringbom 방법으로 착물생성 엔탈피, 자유에너지 및 엔트로피 변화 등 열역학적 특성값을 구하였다. Water soluble poly(sulfonated styrene-co-acrylic acid) was polymerized with sulfonated styrene and acrylic acid in the presence of silver sulfate at 99 ℃ for 4 hrs. The complex formation of poly(sulfonated styrene-co-acrylic acid) with Cu(II) was carried out. The maximum absorption wavelength of the poly(sulfonated styrene-co-acrylic)-Cu(II) system at different pH values was observed at 274 nm and 295 nm. The reduced viscosity of the poly(sulfonated styrene-co-acrylic acid)-Cu(II) complex were measured in the various pH ranges. The formation constants and stability constants of poly(sulfonated styrene-co-acrylic acid)-Cu(II) complex were calculated from Bjerrum method. The changes of enthalpy, free energy and entropy in the above reaction were determined by Ringbom method.
백상현 ( Sang Hyun Baik ),함준수 ( Jun Soo Hahm ),전용철 ( Young Chul Jeoun ),이오영 ( O Young Lee ),이민호 ( Min Ho Lee ),기춘석 ( Chun Suk Ki ),박준용 ( Jun Yong Park ),은창수 ( Chang Soo Eun ),한동수 ( Dong Su Han ) 대한소화기학회 2002 대한소화기학회 춘계학술대회 Vol.2002 No.-
〈배경〉 현재까지 담석의 증가와 연관성을 가진 병적인 상태를 찾고자하는 연구가 진행되어 왔다. 대개의 류마치스 관절염환자는 NSAID를 복용하고 있는 자가 많고, 동물 실험을 NSAID가 담석 생성과 관련이 있음이 발표되기도 하였다. 본 연구에서는 류마치수 관절염환자에서의 담석의 빈도를 제시하고 matched control과의 여러 다른 기준척도등의 비교를 통해 이들간의 유의성을 비교하였다. 〈연구대상 및 방법〉 한양대 류마치스 병원에 입원하였던 선별검
류마토이드 관절염 환자에 대한 Recombinant Interferon Gamma 의 임상시험
권기운(Ki Woon Kwon),변정원(Jung Won Byun),이오영(Oh Young Lee),전용철(Yong Chul Chun),박병권(Byoung Kwon Park),김성윤(Seoug Yoon Kim) 대한내과학회 1989 대한내과학회지 Vol.37 No.2
N/A To evaluate antirheumatic efficacies and possibilities on treatment of rheumatoid arthritis with recombinant interferon-gamma, 44 patients with rheumatoid arthritis were treated with IFN-γ for 20 days and were analysed from the standpoint of Ritchie index, patient's assessment, laboratory findings and sideffect. The observed results are as follows: 1) 44 patients were enrolled, 40 patients could be evaluated. Of these, 22 were responders (55%) according to the criteria for treatment success. 2) In 35 patients, stabilized therapy was continued concomittant with the IFN-γ and were no significant differences with respect to the results of treatment. 3) In responders, Ritchie index decreased from 28 on the day of recruitment into the study to 15 on day 20. 4) The patients evaluation of morning pain and change in mobility showed more improvements in responders than non-responders. 5) Monitering of laboratory parameters revealed no therapeutically relevant changes. Side-effects occurred in 14 out of 40 patients. In 10 of these patients, transient fever was recorded.
이항락 ( Hang Lak Lee ),손주현 ( Joo Hyun Sohn ),김진배 ( Jin Bae Kim ),한동수 ( Dong Soo Han ),전용철 ( Yong Chul Jeon ),함준수 ( Joon Soo Hahm ),이동후 ( Dong Hoo Lee ),기춘석 ( Chun Suk Kee ),박용욱 ( Yong Wook Park ) 대한소화기학회 2005 대한소화기학회지 Vol.46 No.3
Leiomyosarcoma is an uncommon tumor which arises from various sites including uterus, stomach, retroperitoneum, superficial soft tissues, bladder, kidney, and lung. Primary hepatic leiomyosarcoma is a very rare tumor and fewer than 70 cases of primary hepatic leiomyosarcoma have been reported since the first publication in Japan. And there was only one case report of cutaneous metastasis from hepatic leiomyosarcoma. We recently experienced a case of primary hepatic leiomyosarcoma presenting as subcutaneous palpable mass. Herein we report this case with a review of literatures. (Korean J Gastroenterol 2005;46:233-236)
전용철,박상욱,유종선,김구니,장기영 한국고무학회 1996 엘라스토머 및 콤포지트 Vol.31 No.2
The polyurethane was synthesized by the reaction of polycaprolactone diol(Mw 2000), 4,4'-diphenylmethane diisocyanate and 1,4-butanediol as the chain extender. Also, the modified polyurethane polymers based on liquid polybutadiene as a part of soft segment and dimethylolpropionic acid as a chain extender, giving polyurethane with various polarity, were synthesized. The thermal, mechanical, adhesion properties and water contact angles of the polyurethanes were examined. From the. result of the water contact angle, the polarity of the acid modified PU containing 6% acid content was unchanged but mechanical and adhesion properties were improved. The water contact angles on polybutadiene modified PU films were increased with increasing polybutadiene content. The mechanical properties of the polybutadiene modified PU were higher than that of acid modified PU. However, the mechanical properties were reduced as polybutadiene content increased. The result is presumably due to phase separation between hard segment and soft segment. The peel strength of the polyurethane introduced with 5wt% polybutadiene was improved about 150% than that of unmodified PU. The same as the mechanical properties, the more polybutadiene was introduced, the lower peel strength was obtained.
전용철,한동수,이민호,박근태,장세진,최호순,이오영,함준수,기춘석,손주현,박경남,윤병철 대한소화기학회 1998 대한소화기학회지 Vol.31 No.3
Background/Aims: Colonic mucosal lesions akin to mucosal changes in portal hypertensive gastropathy have been observed occasionlly in patients with portal hypertension. However the exact prevalence of these lesions, their relationship to the severity of the liver disease and their associations with gastric mucosal changes is still unclear. The present study assesses the prevalence of rectal varices and colonopathy and factors associated with them in liver cirrhosis. Methods: Thirty one cirrhotic patients and 40 controls underwent endoscopic examinations of upper and lower gastrointestinal tract. Results: Colonic mucosal changes were observed in 16 patients (51.6%) while 0 in control group. They included increased vascularity (12/16, 75.0%), spider like lesion (4/16, 25.0%), nonspecific colitis lesion (1/16, 6.3%). Rectal varices were observed in 2 patients (12.5%) but they were not observed in the controls. Pathologic finding in patients with increased vacularity showed dilatation and increase of vessels (5 of 6 patients), but there was no abnormal finding in patients with spider like lesion (0 of 3 patients). The colonic mucosal changes were not associated with the Child's grade of cirrhosis, the grade of esophageal varices, the presence of gastric varices, the history of bleeding or the patient's experience of ligation therapy. However, cirrhotic patients with portal hypertensive gastropathy had higher prevalence (70.6%) of colonic mucosal change than the patients without it (28.6%, p$lt;0.05). Conclusions: Colonic mucosal changes occur frequently in patients with portal hypertensive gastropathy. However, the prevalence of rectal varices is lower in these patients.