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문동혁,고상모,이길재,Moon, Dong-Hyeok,Koh, Sang-Mo,Lee, Gill-Jae 대한자원환경지질학회 2010 자원환경지질 Vol.43 No.5
전남 해남군 모이산 금광상에서 지구화학적 특성에 대한 연구를 수행하기 위하여 모이산 지표 및 갱내, 대산 지표에서 채취한 총 140개 시료에 대한 지구화학분석결과를 상관분석, 요인분석 그리고 군집분석 등 다변수 통계처리 하였다. 상관분석 결과, 금의 함량이 100 ppb 미만인 비광화대와 100 ppb 이상인 광화대에서 동시에 금과 높은 상관관계를 가지는 원소는 Ag, Cu, Bi, Te 등이며, 이는 연구지역에서 수반되는 함금 은 광석광물들(엘렉트럼, 실바나이트, 칼라버라이트 및 스퉤자이트)과 기타광석광물들(황동석, 텔룰로비스무타이트 및 비스무시나이트)의 산출과 일치된 결과로 인지된다. Mo은 비광화대(0.269)에서 보다 광화대(0.615)에서 상대적으로 높은 상관계수를 가지므로 금광화작용에 의해 그 함량이 강하게 지배되고 있는 것으로 해석된다. Mn, Cs, Fe, Se 등은 비광화대에서는 금과 정의 상관관계를 가지지만 광화대에서는 음의 상관관계를 가지므로 금광화작용 시 모암으로부터 용탈되는 원소군으로 해석된다. Sb은 광화대에서 금과 높은 상관성을 보이지만 비광화대에서는 음의 상관관계를 가지므로 금광화작용 시 부화되는 원소로 지시될 수 있다. 요인분석결과, 비광화대에서 금의 함량에 영향을 받는 요인군에 속하는 원소는 Se, Ag, Cs, Te 등이며 이들은 연구지역 내 비광화대에서 금의 존재 여부를 알려줄 수 있는 원소로 해석될 수 있다. 반면 광화대에서는 Mo과 Te 등이 강하게 금광화작용의 여부를 지시해 주며, 금과 함께 수반되는 은광화작용의 여부를 지시해 줄 수 있는 원소는 Sb과 Cu 등으로 해석된다. 군집분석 결과 비광화대에서 Cd-Zn-Pb-S, Bi-Fe-Cu-Mn, Se-Te-Au-Cs-Ag, As-Sb-Ba 등이 유사한 거동을 보이는 원소군으로 나타나는 반면, 광화대에서는 Cd-Zn-Mn-Pb, Fe-S-Se, As-Bi-Cs, Ag-Sb-Cu, Au-Te-Mo 등이 유사한 거동을 보여주는 원소군으로 나타난다. 이상과 같은 지구화학분석 자료의 다변수 통계처리를 이용하여 금광화대와 비광화대의 산출광물의 거동 및 지구화학적 특성 차이의 비교가 가능하므로 추후 이러한 방법이 이와 유사한 유형의 광상탐사에 유용한 방법으로 적용될 수 있을 것으로 기대된다. Geochemical characteristics of the Moisan epithermal gold-silver deposit with total 140 samples in Haenam area, Jeollanamdo were studied by using multivariate statistical analysis (correlation analysis, factor analysis and cluster analysis). The correlation analysis reveals that Ag, Cu, Bi, Te are highly correlated with Au in the both non-mineralized and mineralized zone. It is resulted from the presence of Au-Ag bearing minerals (electrum, sylvanite, calaverite and stuezite) and non Au-Ag containing minerals (chalcopyrite, tellurobismuthite and bismuthinite). Mo shows relatively much higher correlation at the mineralized zone (0.615) than non-mineralized zone (0.269) which implies Mo content is strongly affected by Au-mineralization. While Mn, Cs, Fe, Se correlated with Au at the nonmineralized zone, they have negative correlation at the mineralized zone. Therefore, they seem to be eluviated elements from the host rock during gold mineralization. Sb is enriched during the gold mineralization showing high correlation at the mineralized zone and negative correlation at the non-mineralized zone. According to the factor analysis, Se, Ag, Cs, Te are the indicators of gold mineralization presence due to the strong affection of gold content in the non-mineralized zone. In the mineralized zone, on the other hand, Mo, Te and Sb, Cu are the indicators of gold and silver mineralization, respectively. While the cluster analysis reveals that Cd-Zn-Pb-S, Bi-Fe-Cu-Mn, Se-Te-Au-Cs-Ag, As-Sb-Ba are the similar behavior elements groups in the non-mineralized zone, Cd-Zn-Mn-Pb, Fe-S-Se, As-Bi-Cs, Ag-Sb-Cu, Au-Te-Mo are the similar behavior elements groups in the mineralized zone. Using multivariate statistical analysis as mentioned above makes it possible to compare the behavior of presented minerals and difference of geochemical characteristics between mineralized and non-mineralized zone. Therefore, it will be expected a useful tool on the similar type of mining exploration.
Koh, Sung-Cheol,Park, Young-In,Koo, Yoon-Mo,So, Jae-Seong The Korean Society for Biotechnology and Bioengine 2000 Biotechnology and Bioprocess Engineering Vol.5 No.3
The obhective of this minireview is to examine how cometabolic biodegradation of polychlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs) might be af fected by plant terpenes and lignins as natural substral substrates abundant in mature. The topics covered, hence are environmental sinficance of PCBs and PAHs, nature and disribution of plant terpences and lignin, structural and metabolic similarities of the natural compounds to PCBs and PAHs, and possible roles of the natural substrates in inducing the biodegradative patathways of PCBs and PAHs
Koh, Sung-Cheol,Park, Young-In,Koo, Yoon-Mo,So, Jae-Seong 한국해양대학교 해양과학기술연구소 2000 硏究論文集 Vol.9 No.2
The objective of this minireview is to examine how cometabolic biodegradation of polychlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs) might be affected by plant terpenes and lignins as natural substrates abundant in nature. The topics covered, hence, are environmental significance of PCBs and PAHs, nature and distribution of plant terpenes and lignin, structural and metabolic similarities of the natural compounds to PCBs and PAHs, and possible roles of the natural substrates in inducing the biodegradative pathways of PCBs and PAHs.
Effect of Pineapple Protease on the Characteristics of Protein Fibers
Koh Joon-Seok,Kang Sang-Mo,Kim Soo-Jin,Cha Min-Kyung,Kwon Yoon-Jung The Korean Fiber Society 2006 Fibers and polymers Vol.7 No.2
A pineapple protease, bromelain, was used to improve the dyeing properties of protein fibers such as wool and silk. The optimal condition for the activity of the pineapple protease was about $60^{\circ}C$ at pH 7. The wool and silk were treated with the protease extracted from a pineapple and the K/S values of the dyed wool and silk were measured using a spectrophotometer in order to compare the dye uptake. The protease treatment enhanced the dyeing properties of protein fibers without severe changes in mechanical properties. The surface appearances of protease-treated fibers were observed by microscopy.
Geological Characteristics of Rare Earth Deposits
Sang-Mo Koh,Ho-Wan Chang 대한민국 학술원 2011 학술원논문집 : 자연과학편 Vol.50 No.2
REE deposits can be divided into carbonatite, hydrothermal/magmatic Fe-REE, placer, alkaline and peralkaline-rock related, and ion-adsorption deposit types. LREE have been mainly produced from Bayan Obo and Mian Ning carbonatite REE deposits of China and Mountain Pass carbonatite REE deposit in USA, which is getting ready for a re-production, whereas HREE have been solely produced from ion-adsorption deposits of China. LREE-enriched deposits like carbonatite and hydrothermal Fe-REE deposits abundantly occur in the world, but HREE enriched deposits are very few. Carbonatite REE deposits are formed in relatively stable intra-plate areas but some are found near plate margins and may be related to orogenic activity or plate separation. Ion-adsorption REE deposits are formed by the weathering of REE-enriched granites under the climate of high temperature and high humidity. Two REE deposits have been also reported in South Korea. The one is Chungju Eorae Mountain REE deposit belonging to alkaline and peralkaline-rock related deposit. It is hosted in meta-volcanics of the Gyemyeongsan Formation of the Ogcheon Group, which is interpreted to have been formed by the differentiation of magma derived from the plate magmatism in the rift zone during the Neoproterozoic Era. The other is Hongcheon REE deposit belonging to carbonatite deposit and distributed in the Gyeonggi Massif. It is interpreted to have been formed by the intrusion of igneous carbonatitic melts and accompanying Na-metasomatism in the Late Proterozoic Era.