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Lactococcus lactis KCTC 2184 의 Nisin Plasmid 에 관한 연구
이경욱(K . W . Lee),장영호(Y . H . Jang),김현욱(H . U . Kim) 한국축산학회 1991 한국축산학회지 Vol.33 No.9
The plasmids of Lactococcus lactis KCTC 2184 producing nisin were studied to find out the nisin plasmid. Lactococcus lactis KCTC 2184 did not ferment lactose and produced raisin, and possessed 9 plasmids and their sizes are 25.1 Mdal, 21.0 Mdal, 17.0 Mdal, 9.2 Mdal. 5.2 Mdal, 3.4 Mdal, 2.7 Mdal, 1.8 Mdal and 1.4 Mdal. Seventeen Mdal plasmid of Lactococcus lactis KCTC 2184 was found to code both raisin production and sucrose-fermenting ability.
항생물질 Nisin 을 생산하는 Lactococcus lactis KCTC2184 의 특성
이경욱(K . W . Lee),장영호(Y . H . Jang),김현욱(H . U . Kim) 한국축산학회 1990 한국축산학회지 Vol.32 No.10
Lactococcus lactic KCTC2184 was found to be lactose-negative lactic acid bacteria. Antimicrobial agent produced by Lactococcas lactic KCTC2184 inhibited the growth of Lactococcas lactis NCDOl404. Lactococcus lactic subsp. cremoris CH-14. and Lactobacillus casei YIT9018 in modified M17 medium. The antimicrobial activity was not inactivated by boiling in water for 10 min and by trypsin digestion, and was stable at pH 2.0, but was inactivated at pH 11.0 and by α-chymotrypsin digestion. The overall characteristics indicate the antimicrobial activity due to $quot;nisin$quot;. The quantity of nisin produced by Lactococcas lactic KCTC2184 was examined in four different media; M17 medium, Ml7glc medium, Elliker medium, and LTB medium. After 8 hours of incubation, LTB medium and M17glc medium supported good nisin production. Lactococcas lactic KCTC2184 produced more nisin in LTB medium with pH control between pH 6.5 and pH 6.8 than without pH control. Lactococcas lactic KCTC2184 produced nisin rapidly after 3 hours of inoculation and stopped producing nisin in 8 to 10 hours after inoculation.
경사진 출구면에 발생한 버의 제거를 위한 디버링 공구의 효율적 운용
김병권(B.K.Kim),이경욱(K .U.Lee),박진우(J.W.Park),홍상인(S.I.Hong),고성림(S.L.Ko) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
An Experiment was carried out to study deburring in drilling hole on the inclined exit surface. Two different deburring tools, exit surface angles, materials and cutting conditions were selected to check their performance using CNC machining center. In deburring operation, there are not only flat exit surfaces but also inclined exit surfaces which is described as inclination angle. Inclination of exit surface causes a quite different burr formation when comparing with flat surface. Deburring characteristics are analyzed according to the deburring tools and cutting conditions. Several strategies for a effective deburring on inclined exit surface were proposed.