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금속판상의 TiO2-코팅 조건에 따른 이소프로필 알코올의 광분해
유동식,하진욱 한국공업화학회 2005 응용화학 Vol.9 No.1
The photodegradation of IPA according to coating conditions was examined by TiO₂/'P-25-coated aluminium metal plate. The following results can be concluded. Inorganic(KR-400), inorganic-organic hybrid(TMOS) and organic(A-9540) resins were used as binder. Ti0₂ coated surface of aluminum metal plate was clear with all binders. The activity for IPA degradation appeared to range in order A-9540>TMOS>KR-400. The optimum activity obtained when the ratio of TMOS and P-25 was 1.6:10, and when the ratio of A-9540 and P-25 was 1.0:6.0.
광섬유상의 TiO2-코팅조건에 따른 이소프로필 알코올의 광분해
유동식,하진욱 한국공업화학회 2005 응용화학 Vol.9 No.1
The photodegradation of IPA according to coating conditions was examined by TiO₂/P-25-coated. POF. The following results can be concluded. In the photoactivity of TiO₂-coated POF, ethanol solvent was higher than other solvents. Inorganic(KR-400), organic(A-9540) and inorganic-organic hybrid(GPTMS·TMOS) resins were used as binder. TiO₂ coated surface of POF was clear with all binders. Organic binder(A-9540) showed the highest activity for IPA degradation. But organic binder was degraded by TiO₂, inorganic binder had lower binder ability than others. The optimum activity obtained when the ratio of TMOS and P-25 was 0.05~1:1.
Small Cell Lung Cancer Cell Line을 이용한 Xenoplanted nude mice에서 방서선 치료후 종양의 변화 관찰에 관한 연구
김동욱,유명상,김재욱,이병돈,장혁순 순천향의학연구소 2002 Journal of Soonchunhyang Medical Science Vol.8 No.1
Recently, combination of ionizing radiation with inhibitors of angiogenesis has been reported to improve tumor eradication compared to treatment with irradiation alone. However, the mechanism of this effect have not been defined. For this pupose we established a non-small cell lung cancer model in nude mice. Tumor vascularization was visualized in vivo by MRI using gadolinium-DTPA as contrast agent. Further, cryosections were produced exactly in the MRI slice positions. Since we were interested to examine formation of recurrent tumor irradiation was performed with a single fraction of 6 Gy. This dose caused a partial remission followed by recurrent tumor growth 25 to 35 days after therapy. The process of partial remission as well as formation of the recurrent tumor was examined in 35 nude mice analysing the following parameters: (1) contrast agent enhancement using high-resolution MRI, (2) proliferation of tumor cells and fibroblast using Ki-67 immunohistochemistry, (3) formation of microvessels using CD31 immunohistochemistry. The latter analyses lead to differentiation of three stages. Stage 1(day 1 to 15 after irradiation) was characterized by increasing area of dead cell mass in hematoxylin-eosin stained slides that corresponded to a decrease in tumor cellproliferation as well as contrast agent enhancement. The percentage of Ki-67 positive tumor cells decreased from initially 45.1 ±6.0 to 1.4 %±1.2 % on day 15. Stage 2(days 6 to 20 after irradiation; overlapping with stage 1) was characterized by proliferation of fibroblast leading to formation of fibrotic septae with abundant microvessels. Already during late stage 2 MRI identified new contrast agent enhancing areas. Stage 3(day 20 to 40 after irradiation) was characterized by new tumor cell proliferation. Interestingly, tumor cells almost exclusively proliferated in the direct neighbourhood of the fibroblasts and blood vessels was a condition prior to foramtion of recurrent tumor tissue. Thus our results are in contrast with the view that tumors or recurrent tumors begin as avascular masses that later induce neovascularization. With respect to clinical practice our results suggest that (1) adjuvant anti-angiogenic therapy should not be limited to the day of irradiation but should cover a critical period until day 5 to day 20 after radiotherapy, (2) adjuvant therapy should also include inhibition of fibroblast proliferation, (3) MRI can identify a recurrent tumor 10 to 15 days before occurrence of new tumor growth.
폴록사머 및 프로필렌글리콜을 이용한 클로트리마졸 고형 좌제의 물리화학적 특성
현경희,오유경,김정애,공경환,김지현,양준호,배명수,김호동,이종달,장현욱,용철순,최한곤 한국약제학회 2005 Journal of Pharmaceutical Investigation Vol.35 No.2
To develop a clotrimazole-loaded solid suppository with poloxamer and propylene glycol, the melting points of various formulations composed of poloxamer 188 (P 188) and propylene glycol were investigated. The dissolution study of clotrimazole delivered by the suppository composed of P 188 and propylene glycol was performed. The mixtures composed of P 188 and propylene glycol were homogeneous. Propylene glycol affected the melting points of poloxamer mixtures. In particular, the mixture [P 188/propylene glycol (70/30%)] with the melting point of about 32°C was a solid form at room temperature and instantly melted at physiological temperature. Furthermore, propylene glycol affected greatly the dissolution rates of clotrimazole from the suppository. Dissolution mechanism analysis showed the dissolution of clotrimazole was proportional to the time. Our results indicated that the solid suppository with P 188 and propylene glycol would be a candidate of rectal dosage form for clotrimazole.
대퇴 전자간 골절의 내고정시 발생한 천부 대퇴 동맥의 관통 손상 : 증례보고
김기수,류상욱,서유석,임동윤 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.1
The superficial femoral arterial injury due to the internal fixation surgery in intertrochanteric femoral fracture has been reported to be an unusual complication case. Recently, we experienced a case of patient with penetrating injury of superficial femoral artery induced by the internal fixation surgery with a gamma nail in an intertrochanteric femoral fracture. This penetrating injury was successfully treated by the transplantation surgery with an artificial blood vessel, which has been not yet reported. Therefore, we report the present clinical result obtained from the case work with reviewing literature, It seems likely that this case is the first report related to penetrating injury of superficial femoral artery induced by the internal fixation surgery with gamma nail.
동종 조혈모세포이식 후 발생한 크립토콕쿠스 척추염 1예
고윤호,임동준,이성수,조유경,이동건,최정현,김유진,민창기,김동욱,박정미,김춘추,신완식 대한감염학회 2001 감염 Vol.33 No.4
Skeletal cryptococcosis is an uncommon infection. Cryptococcus is a common cause of meningitis and infects 7∼10% of patients with AIDS. As well as AIDS, the infection may be seen in association with leukemia, lymphoma, Hodgkin's disease, sarcoidosis, tuberculosis and diabetes, also in patients on steroid medication. But there is no case report of skeletal cryptococcosis following allogeneic hematopoietic stem cell transplantation. A 40-year-old woman was admitted to the hospital because of low back pain. She had chronic myelogenous leukemia for 2 years and underwent allogeneic hematopoietic stem cell transplantation 8 months ago. She have been treated with steroid and cyclosporine orally because of chronic graft versus host disease. On examination she was afebrile and had posterior lower lumbar tenderness. But, she had no reduced strength of low extremities. Open biopsy was underwent. Histology demonstrated budding, round-to-oval, refractile yeast-like organisms within debris. The results of a lumbar puncture were unremarkable and cerebrospinal fluid culture failed to grow bacteria and yeast. The patient was treated with amphotericin B (1 gram) and AmBisome□ (2.8 gram) over 6 weeks. Three months after cessation of therapy, the patient was doing well.(Korean J Infect Dis 33:298∼301, 2001)
A role of HNO<sub>3</sub> on transparent conducting film with single-walled carbon nanotubes
Shin, Dong-Wook,Lee, Jong Hak,Kim, Yu-Hee,Yu, Seong Man,Park, Seong-Yong,Yoo, Ji-Beom IOP Pub 2009 Nanotechnology Vol.20 No.47
<P>There is some controversy regarding the effects of HNO<SUB>3</SUB> on films of single-walled carbon nanotubes (SWCNTs). In this study we examined the change in sheet resistance of an HNO<SUB>3</SUB>-modified SWCNT film after different drying times at 85 °C using various analytical techniques. The shift and suppression in the Raman spectra, bleaching of the transition peaks related to van Hove singularities and a shift in the original peak in the C 1s XPS spectra provided evidence for p-type doping. A decrease in sheet resistance was also observed in the SWCNTs films due to the removal of residual <I>N</I>-methylpyrrolidone solvent on the surface and bundle of SWCNTs. These results suggest that p-type doping has a larger effect on the sheet resistance than the removal of residual <I>N</I>-methylpyrrolidone by an HNO<SUB>3</SUB> treatment. </P>