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킬레이트 樹指에 依한 몇가지 重金屬의 吸着 및 除去에 關한 實驗的 硏究
鄭文鎬 서울大學校保健大學院 1986 보건학논집 Vol.23 No.1
Two chelating resins such as 8-hydroxy quinoline-resorcinol-salichlic acid (HQUS) and 8-hydroxy quiinoline-thiourea-salicylic acid (HQTS) were synthesized by the condensation of 8-hydroxy quinsline and salicylic acid, using resorcinol and thiourea as bridges, respectively. The ion exchange potentials of the chelating resins were tested and compared with other commerical ion exchange resin, Dowex 50W-X8. The adsorption, separation, and distribution coefficients of the heavy metal ions such as pb(II), Hg(II), Cu(II), Co(II). Ni(II), Mg(II), Cr(III), and Fe(III) on the chelation resing were investigated using the batch method of column chonatography. The findings are summarized as follows: 1. HQRS and HQTS resins were insoluble in general organic solvents, and swollen and slowly dissolved in alkaline solutions, and the hydrated retes were 2.0g/g and 1.5g/g, respectively. 2. Ion exchange capacities of HQRS and HQTS resins were 5.31meq/g and 3.56meg/g, and the maximum adsorption of Mg(II) ion were indicated between 30 and 60 minutes, respectively, at pH 6 on HQRS and HQTS resins. 3. Adsorption retes of Pb(II) and Fe(III) ions were maximum under pH 4 and Hg(II), Cd(II), Co(II), Cu(II), Ni(II), Mg(II)and Cr(III) ions were adsorb maximally at near pH 6. 4. The differences of distribution coefficients of heavy metals were higher in hydrochloric acid solution than in fixed concentration of solution of EDTA and acetic acid solutions, and more diferences found in lower concentrations. 5. The adsorption capacities of HQRS and HQTS resins for heavy metals in concentrated acid solutions were less than those of Dowex 50W-X8. but ions with larger electric charges as Fe(III) and Cr(III), and ions with lons with longer ionic radius as Hg(II) and Cd(II), were well adxorbed to HQRS and HQTS at pH 2-6. 6. The amount of adsorption and distribution coefficient of Hg(II) ion to HQRS and HQTS in different concentrations of hydrochloric acid solutions were higher than those of other metal ions. Dowex 50W-X8 resin showed. 7. The HQRS nd HQTS resins comparing with commercial resin, Dowex 50W-X8, could selectively separate and remove and Hg(II) ion. 8. The difference of special separative property of heavey metal iocs in IM-HCL solution was such that HQRS resin separated out Co(II), ion from Ni(II), and Fe(III), and HQTS resin separated out Ni(II) from Co(II)and Fe(III) ions. 9. The HQRS chelate resin adsorbed Co(II), Ni(II), Cu(II), Cr(III) and Fe(III) ions in industrial waste water at 100% livel. On the other hand the HQTS chelate resin adsorbed only Pb(II) and Ni(II) ions in industrial waste saters at 100% level. For Co(II), Cr(III) and Fe(III) ions, 80%, and 98% were absorbed by the HQTS chelate resin respectively.
게르마늄, 철, 아연 및 몰리브덴이 벤조피렌의 돌연변이에 미치는 영향에 관한 연구
김민영,정문호 서울大學校保健大學院 1998 國民保健硏究所硏究論叢 Vol.8 No.1
This study examined the antimutagenic effect of germanium, iron, zinc and molybdenium, independently, upon the mutagenic potential of benzo[a]pyrene(BaP) using an Ames test. Each trace element was tested at concentrations of 0, 8, 40, 200, 1000 and 5000 ㎍/plate with 2 ㎍/plate BaP in the presence of rat liver microsomal activation system(S-9). Dimethyl sulfoxide(DMSO) served as a negative control while BaP in DMSO at 2 ㎍/plate alone served as a positive control. Three plates per dose were utilized for the tests. Comparing the antimutagenic effects of germanium, iron and molybdenium in the Salmonella typhimurium TA98 strain, iron showed the strongest effect. And in the Salmonella typhimurium TA100 strain, iron and germanium showed stronger effect than molybdenium. In the case of zinc, there was a 6% inhibitory effect against mutagenic response of 2 ㎍/plate of BaP to 200 ㎍/plate of Zn utilizing the TA98 strain. However the mutagenicity of BaP was not reduced by any dose levels of Zn and the number of colonies multiply with the increasing Zn dose in both strains. It can be presents two possible mechanisms of the antimutagenic effect of germanium, iron and molybdenium against benzo[a]pyrene; first, these test materials can intervene the action of mixed function oxidase(MFO) system on benzo[a]pyrene to inhibit the production of mutagenic metabolite, and second, these test materials can act directly on benzo[a]pyrene or its activated metabolite and thus hinder it from binding covalently to DNA.
SOS Chromotest를 利用한 低線量 X-선의 突然變異原性 評價
金基錫,鄭文鎬 서울大學校保健大學院 1995 國民保健硏究所硏究論叢 Vol.5 No.1
This study is concerning to comparisons between mutagenicity of low dose X-ray which exists in environment and that of other mutagenic chemicals by means of SOS chromotest. The results are as follows. SOS chromotest is useful method to screening low dose of X-ray. 45 mGy of X-ray can induce SOS response, so induction factor of SOS chromotest was increased by 23.3% to control. Dose-response curve of X-ray shows positive linear correlation and no threshold form. In all studied dose ranges of X-ray, 4-NQO and MMC, there's no significant variation in alkaline phosphatase activity. This result indicates that such a low concentration can't inhibit overall protein synthesis mechanism in cell. If high dose of mutagen which can inhibit protein synthesis mechanism were exposured, it'd need to revise of alkaline phosphatase activity to avoid underestimating of sfiA gene expression. But this studied dose ranges of the mutagen didn't affect the total protein synthesis, so curve of induction factor activity is similar to that of β-galactosidase activity. β-galactosidase activity increased according to exposure dose and, as a result, induction factor which was revised by total protein synthesis amount also increased. Degree of Genotoxicity can be comparable between concentration of mutagenic material by use of SOS chromotest.
중소기업 분야별 생산 정보의 효율적 데이터 수집을 위한 방법론 연구
정문호,박재일 대한산업공학회 2015 대한산업공학회 춘계학술대회논문집 Vol.2015 No.4
In this study, we introduce new methods to informationize small-sized enterprises to strengthen their competitiveness. First, we examine SME information management Status and analyze why small businesses are not informationized. There are some problems why small businesses are not informationized. With those problem, we think about the application developing method of an individualized approach to cell unit and LEGO-style modular ICT method. Also we conduct these method to verify their effects and advantages in the real case. That practice results in lower cost, better effects and advantages than existing methods, especially for the sustained utilization. Small-sized business information management will be vitalized by cost reduction of APP development and using former infra instead of extra expert.