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반도체 에칭 폐액과 굴패각 재활용을 통한 수산화아파타이트의 제조
오승권 ( Seung Kwon Oh ),박정호 ( Jung Ho Park ),손유아 ( Yu Ah Son ),조민화 ( Min Hwa Jo ),이상천 ( Sang Chun Lee ),김기호 ( Ki Ho Kim ) 경남대학교 신소재연구소 2014 신소재연구 Vol.26 No.-
불산, 질산, 인산이 섞인 용액에 고순도 소석회 분말 또는 굴패각을 분해하여 얻어낸 소석회분말을 직접 반응시켜 불소아파타이트를 합성하였다. 인산 수용액의 양을 조절하여 pH 7~8에서 양론적인 아파타이트 비의 값 Ca/P 1.67에 가까이 합성할 수 있었다. 수집한 굴패각을 열분해하여 수화반응하자 소석회를 얻을 수 있었으며 반응시 불소 아파타이트가 합성되었다. 교반시간, 열처리 온도, 확산 속도에 따른 입자 크기를 확인하자 열처리 온도와 확산 속도에 따라 입자 크기 및 미세구조가 다르게 나타났다. 불소아파타이트에 염기물질을 반응시켜 수산화아파타이트 합성도 확 인할 수 있었다. Fluorapatite was synthesized by direct reaction of a solution mixed with fluoric acid, nitric acid, and phosphoric acid and a high-purity calcium hydroxide (Ca( OH)2) from degradation of oyster shells. The pH is adjusted by changing the amount of the phosphoric acid soution in the reaction, can be synthesized in a Ca/P ratio 1.67 of stoichiometric apatite in pH 6~7. The particle size and micro structure showed differently with the variation of temperature and diffussion speed in the tests for agitating time, heating temperature, and diffussion speed. The characteristics of synthetic fluorapatite on heavy metal absorption were studied. In the present study, hydroxyl group was found at the reaction between fluorapatite and basic compound, indicating that hydroxyapatite was synthesized.
대장 선암에서 유세포 측정에 의한 DNA 분석과 면역효소 염색을 이용한 PCNA와 ras oncogene에 관한 연구
오승권,김세민 고려대학교 의과대학 1993 고려대 의대 잡지 Vol.30 No.1
The flow cytometrc DNA analysis and the immunohistochemical staining of proli-ferating cell nuclear antigen (PCNA) & c-H-ras oncogene have been reported to reflect the cellular activities and the proliferative rates of the progression of neoplasms. The DNA contents and cell cycles of 56 cases of colon adenocarcinoma resected in Korea University Hospital were measured by flow cytometry in order to evaluate the relationship between the expression of c-H-ras oncogene & PCNA. The results were summarized as follows ; 1. There were no significant differences between the ploidy pattern and histolo-gic type (X2=2.89, 2df, p=0.235), between the ploidy pattern and modified Dukes classification (X2=6.74, 3df, p=0.08). 2. There were significant differences between the diploid and aneuploid in G0+G1 phase (p<0.01), S phase (p<0.01) and proliferating index (PI) (p<0.05). 3. G2+M/G0+G1 was significantly higher in C1 than B1, G2 and C2 (p<0.05), G0+G1 and S phase was also significantly higher in poorly than well differentiated type (p<0.05). 4. The strong positive correlation between the staining index of c-H-ras oncoge-ne and PI was noted in the aneuploidy pattern of colon adenocarcinoma (r=0.66, p<0.05). 5. There was positive correlation between the staining index of PCNA and the st-aining index of c-H-ras oncogene (r=0.40, p<0.01) 6. We could not observe the increase of S phase & PI which reflect the prolifer-ative activity in spite of increasing in staining index of PCNA and c-H-ras oncogene (S=11.07-2.65 PSI+4.51 CSI, R square=0.06, P of PSI=0.39, P of CSI=0.09. PI=12.92+1.14 PSI+4.26 CSI, R square=0.06, P of CSI=0.76. P of CSI=0.24).
폐쇄성 황달환자에 있어서 수술전 경피간 담도배액술의 효과
이형석,오승권 대한소화기학회 1992 대한소화기학회지 Vol.24 No.5
We reviewed retrospectively 68 patients with benign or malignant obstructive jaundice whose total bilirubin is above 10mg/dl in order to determine the efficacy of preoperative percutaneous transhepatic biliary drainage (PTBD). Thirty-five patients underwent PTBD preoperatively. The mean of hospital stay was longer for the PTBD group than non-PTBD group, but the difference was not significant. The mean of serum bilirubin and alkaline phosphatase levels checked at preoperative day and postoperative 1 weeks were signifieant lower in PTBD group than non-PTBD group compared to levels at admission. Complication directly related to PTBD procedure were 8 cases in 6 patients (17.3%), and were improved without major sequela. Postoperative complication was developed in 14 patients (42.4%) without PTBD and in 7 patients (20%) having PTBD. The mortality within postoperative 1 month was 18.1% (6 patients) in non-PTBD group and 8.5% (3 patients) in PTBD group. We concluded the preoperative PTBD reduced operative mortality and morbidity without significant prolongation of total hospital stay.