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조용현,조항문,현재혁,조재범,김갑수 忠南大學校 環境問題硏究所 1997 環境硏究 Vol.15 No.-
In the study , the feasibility of deposit soil in river and stream bed as a substitute for conventional plant soil was investigated through the analysis of soil characteristics and germination growth rate for 75days. Proper mix between samples from different places was compared to optimize the germination and growth rate of plant in the ratio of 2 : 1 and 3 : 1 (sand : deposit). From the results, it could be concluded that the deposit mix 3 : 1 showed most favorable germination and growth conditions for pancy and the deposit containing enough amount of silt and clay components showed most favorable conditions for marigold. Consequently, the feasibility of deposits as a substitutional plant soil was evaluated to be high.
CaO-SiO_2-MgO_(sat.)-Fe_tO 슬래그와 용철사이의 V 평형분배비
金抗洙,鄭雨光,趙南敦,崔鉉洙 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.4
The equilibrium study has been made on the vanadium distribution between CaO-SiO_2-MgO_ast.-Fe_tO slag and liquid iron over the temperature range from 1540℃ to 1640℃. The vanadium distribution ratios(L_v) were approximately larger than phosphorous distribution ratios(L_p) by a factor of 10∼100 times. The L_v dependence on slag composition and temperature was found to be similar to the case of L_p. The vanadium distribution ratio increases with the slag basicity and Fe_tO content in slag, but decreases with the increase of temperature. A linear relationship was observed between logarithm of (V)/{[V][O]^n} (n=2 or 2.5) and (CaO+0.3MgO)/SiO_2. It is assumed that the vanadium ion is in the form of V^4+ or V^5+ in slag. The mutual function relating the slag components, F_s=0.58(CaO/ SiO_2)+0.025Fe_tO, was introduced to explain quantitatively the influence of slag composition on the vanadium distribution ratio. The log values of vanadium distribution ratio as a function of Fs were derived at the fixed temerature of 1590℃ and 1640℃.
Agar-Gel Immunodiffusion Test를 이용한 돼지흉막폐염(Swine Pleuropneumoniae)의 진단에 관한 연구
심항섭,장경수,조용성,전무형 충남대학교 수의과대학 동물의과학연구소 1994 動物醫科學硏究誌 Vol.2 No.-
To establish an effective diagnostic measure for detection of the antibodies against Actinobacillus pleuropneumoniae, that is the primary agent of swine pleuropneumoniae, the methods for micro-agglutination test(MAT) and agar-gel immunodiffusion test(AGID) were improved and standarized and the comparative studies were carried out. The results obtained through the experiments were summarized as follows. 1. The rabbit hyperimmune sera to reference serotypes 1 to 6 were cross-tested with MAT and AGID. The range of antibody titers on MAT was 80 to 1280, showing the cross-reaction in serotypes 3, 4, 5 and 6. In AGID, the range of antigen titers was 8 to 32, and cross-reaction was observed in serotype 5. The optimal concentration of antigen MAT were 1.25㎎/㎖ 2. In AGID, the most promising antigen and the buffer for agar-gel were EDTA-treated antigen and 0.05M tris buffer(pH 7.2), respectively. 3. By the tests for 200 swine sera, it was found that the accumulative frequency of positive reaction for the 6 serotypes were 240 in MAT and 163 in AGID. 4. when compared the results of AGID with those of MAT for 200 swine sera, all sera with MAT titier under 20 were negative in AGID. Of the sera with MAT titer 40 and 80, 24.7% and 93.9% were positive in AGID, respectively. All sera with MAT titer over 160 showed positive in AGID. 5. In conclusion, the established MAT showed high sensitivity but low specificity, whereas AGID revealed low sensitivity but high specificity. The established AGID test was considered very efficient for detection of antibodies and serotyping of swine sera.
생체분해성 고분자를 이용한 사시수술용 제형개발 및 효용성에 대한 연구
민병무,김용백,김승영,김창식,박근성,길숙종,조항진,이성복,노승무,송규상,강대영,조준식,양준묵,정경수,최선웅,이진호,김학용,인현빈 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.1
A new device, muscle clamping system was developed to facilitate exact quatifying technique A strabismus surgery, and reduce the risk of complications. The device is composed of a lower fixing body with three jaws and an upper supporting body. They are used to clip an extraocular muscle and fix it to the sclera with a single bite. Superior rectus recession on 16 rabbit eyes were performed with this new device. Conjunctival injection, muscle adhesion strength, and light microscopic findings were examined at 1, 2, 4 and 8 weeks postoperatively. The Conjunctival injection were minimal, adhesion power ranged from 420 to 600 gram gravity, which is sufficient in withstand the normal pull of human extraocular muscle. In microscopic exam, some Inflammatory cells and fibrosis were found. The new device was technically easy, fast, and accurate, so it may be useful in stabismus surgery.
생체분해성 망막압정을 이용한 망막고정에 대한 실험적 연구
김용백,민병무,김창식,박근성,김승영,길숙종,조항진,이성복,노승무,송규상,강대영,조준식,양준묵,정경수,최선웅,이진호,김학용,인현빈 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.1
Biodegradable retinal fixation devices obtain mechnical fixation of the retina with desirable chorioretinal scarring and with the potential for local, sustained release of antimetabolites and steroids to inhibit proliferative vitreoretinopathy. We manufactured a biodegradable retinal tack with barb that was designed in order to prevent intrusion from implantation of retinal tacks. This study was carried to evaluate the efficacy for retinal fixation and the capability for sustained release of drugs with a newly designed biodegradable retinal tack Biodegradable retinal tacks were made of polymers of glycolic acids and were designed with barbs in a shape to prevent the disinsertion. Biodegradale retinal tacks are divided into 3 parts, a conical portion that is inserted into the sclera, a cylinder portion that remains in the vitreous, and a neck portion between the pin and the cylinder. The tapered conical end was manufactured to allow easy insertion through the retina and choroid into the sclera. A cylinder portion was manufactured with a tapered angle that fixes firmly into the orifice of 19 gauge spinal needle. A neck portion, 0.4 mm in diameter, was designed to prevent disinsertion from following implantation of retinal tack. The applicator was a 19 gauge spinal needle and its orifice was prepared to 15°angle to accept the tapered cylinder portion of the retinal tack. The retinal tacks, secured in the needles, were passed through the formed vitreous and inserted into the retina, choroid, and sclera and were released by pushing the internal needle, usually within 2-3mm of the medullary ray of the posterior rabbit retina A retinal tack was placed in each of 8 pigmented rabbit eyes. Slit-lamp biomicroscopy, indirect ophthalmoscopy and fundus photography were performed periodically from 1 day to 8 weeks after surgery. Eight eyes were enucleated and studied by light microscopy at 8 weeks. Biomicroscopic evaluation of the animals revealed edemas adjacent to the retinal surfaces immediately after insertion of the biodegradable retinal tacks in all the animals. These edemas disappeared after 1 week. The first noticeable change in the size of retinal tacks was shown after 2weeks. The size of the retinal tacks gradually got smaller, decreasing to about one-half at 4 weeks and about one-third at 8 weeks. All retinal tacks remained in inserted places without any movement for an 8 week period. On light microscopy, epiretinal proliferations were seen to extend into the vitreous cavity. Cellular capsules that lined the inner aspect of the scleral defect caused by tack insertion were found. However the adjacent retina had a normal cytologic appearance and architecture in all specimens. We manufactured a biodegradable retinal tack that is designed to prevent intrusion from implantation of retinal tacks. All biodegradable retinal tacks reduce in size with time, but no retinal tacks extruded from the inserted place. The newly designed biodegradable retinal tack can be used for retinal fixation and may be used as a vehicle for the introduction of pharmacologic agents to prevent the cellular events that promote proliferative vitreoretinopathy.
Rotenoisin A is a novel anti-adipogenic compound
Cho, Hang-Hee,Park, Hyeon Soo,Jang, Sun-Hee,Won, Chungkil,Kim, Hong-Duck,Kim, Tae Hoon,Cho, Jae-Hyeon Elsevier 2019 Bioorganic & medicinal chemistry letters Vol.29 No.1
<P><B>Abstract</B></P> <P>The purpose of this study was to investigate the mechanisms underlying the inhibitory effects of rotenoisin A on adipogenesis in 3T3-L1 preadipocytes. 3T3-L1 cells were treated with rotenoisin A for 8 days after the induction of differentiation. Oil-red O staining showed that rotenoisin A significantly inhibited DMI-induced lipid accumulation and adipocyte differentiation. We found that rotenoisin A treatment of 3T3-L1 preadipocytes significantly reduced the mRNA and protein levels of the key adipocyte-specific transcription factors C/EBPβ, C/EBPα, and PPARγ and markedly inhibited the expression of fatty acid-binding protein (aP2), fatty acid synthase (FAS), and lipoprotein lipase (LPL). Furthermore, we observed that rotenoisin A substantially increased the phosphorylation of AMP-activated protein kinase (AMPK) and its downstream target phosphorylated acetyl CoA carboxylase (ACC). However, co-treatment with Compound C, an AMPK inhibitor, reversed the rotenoisin A-induced inhibition of the expression of the adipogenic transcription factors C/EBPα and PPARγ and decreased the levels of phosphorylated AMPK in differentiated 3T3-L1 cells. These results demonstrated that the anti-adipogenesis mechanism involves the down-regulation of critical adipogenic transcription factors, including C/EBPβ, C/EBPα, and PPARγ, through activation of the AMPK signaling pathway by rotenoisin A.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We investigated the anti-obesity effect of rotenoisin A in 3T3-Ll adipocytes. </LI> <LI> Rotenoisin A reduced the expression of C/EBPα and PPARγ in 3T3-L1 adipocytes. </LI> <LI> Rotenoisin A increased AMPK and ACC phosphorylation in 3T3-L1 adipocytes. </LI> <LI> Rotenoisin A inhibited adipocyte differentiation and adipogenesis in 3T3-L1 cells. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
산업폐수배출시설 업종별 수질오염물질 배출실태(4) -섬유제품, 염색, 정리 및 마무리 가공업과 펄프·종이 및 판지 제조업-
조항수 ( Hang Soo Cho ),노혜란 ( Hye Ran Noh ),황문영 ( Moon Young Hwang ),임종권 ( Jong Kwon Im ),김재훈 ( Jae Hoon Kim ),류덕희 ( Doug Hee Rhew ),유순주 ( Soon Ju Yu ),이재관 ( Jae Kwon Lee ) 한국물환경학회(구 한국수질보전학회) 2015 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2015 No.-
RKO 대장암 세포주와 MCF-7 유방암 세포주에서 Sodium Butyrate와 5-aza-2’-deoxycytidine에 의한 종양세포 성장억제 상승작용
조항주(Hang Joo Cho),박순철(Sun Cheol Park),김기환(Kee Whan Kim),강원경(Won Kyung Kang),조현민(Hyun Min Cho),김정수(Jeong Soo Kim),김영애(Young Ae Kim),안창혁(Chang Hyeok An) 대한외과학회 2009 Annals of Surgical Treatment and Research(ASRT) Vol.76 No.5
Purpose: It is known that DNA methylation is associated with histone acetylation status in regulation of gene expression. In this study, we investigate the effect of demethylating agents and histone deacetylase (HDAC) inhibitor on the tumor suppression and the combined effect of two agents according to methylation status in human colon and breast cancer cell lines. Methods: In this study, the RKO colorectal cancer cell line, MCF-7 breast cancer cell lines were considered. For each cell line, we used HDAC inhibitor sodium butyrate (SB), demethylating agent 5-aza-2’-deoxycytidine (5-aza-DC) and a combination of both agents. We estimated the percentage of cell survival using the XTT method and experimented with the augmentative effects of both agents. Results: In RKO cell line in which most of the genes are methylated, 74% of cell survival was shown for 5-aza-DC treatment and 83% of cell survival for SB treatment. In MCF-7 cell line that approximately half of the genes are methylated, 82% cell survival was shown for 5-aza-DC treatment and 63% cell survival for SB treatment. We observed that the survival fraction is lower after the combined treatment of 5-aza-DC and SB than that of 5?aza?DC or SB alone in both RKO (53%) and MCF-7 (49%) cell lines (P<0.001). Conclusion: For highly methylated genes, 5-aza-DC is more effective on the tumor suppression than SB. On the other hand, if the methylation of the promoter region is at low density, SB is noted to be more effective than 5-aza-DC. Furthermore, the combined treatment of 5-aza-DC and SB is more effective than using each agent alone.