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효모 유래 셀레늄 펩타이드의 인간 섬유아세포에 대한 UVB 보호효과
이향복(Hyang-Bok Lee),이정옥(Jung-Ok Lee),호앙구엔(Dung H. Nguyen),윤선아(SunA Yoon),엄지민(Jimin Um),이유리(Yu Ri Lee),문형인(Hyung-In Moon),정진호(Jin Ho Chung),김은기(Eun-Ki Kim) 한국생물공학회 2009 KSBB Journal Vol.24 No.5
셀레늄 함유 펩타이드 (셀레늄 펩타이드)는 무기 셀레늄이 포함된 배지에서 효모를 배양하여 효모의 자가분해에 의해 만들었다. 효모 배양에 의해 만들어진 셀레늄 펩타이드는 GPx 유사 활성을 보였으며, UVB 조사가 된 인간 섬유아세포에 대하여 세포 보호효과를 나타냈다. 셀레늄 나이트레이트는 10<SUP>-9</SUP> 몰 농도에서 낮은 세포독성을 보인반면 셀레늄 펩타이드는 최소의 독성만을 보였다. 또한 셀레늄 펩타이드는 인간 섬유아세포의 성장과 procollagen type I을 증가시킨 반면 MMP-1의 감소를 가져왔다. 연구결과 셀레늄 펩타이드가 무독성의 항산화제로서의 가능성을 보여주었다. Selenium-containing peptide (Selenium peptide) was produced by autolysis of Saccharomyces cerevisiae which was cultured in inorganic selenium-supplemented medium. Selenium peptide showed antioxidant activity and protective effects on UVB irradiated human fibroblast. Minimal toxicity of selenium peptide was observed whereas selenium nitrate exhibited cell toxicity as low as 10<SUP>-9</SUP> M. Selenium peptide also increased human fibroblast growth, procollagen type I and also decreased MMP-1 (matrix metalloprotease-1). This result showed the potential of selenium peptide as a nontoxic antioxidant.
냉간압연한 고 Mn 오스테나이트계 스테인리스강의 기계적성질에 미치는 서브제로처리의 영향
황태현 ( T H Hwang ),정목환 ( M H Jung ),이종영 ( J Y Lee ),이향백 ( H B Lee ),강창룡 ( C Y Kang ) 한국열처리공학회 2012 熱處理工學會誌 Vol.25 No.5
The effect of subzero treatment on the mechanical properties of cold rolled high manganese austenitic stainless steel was investagated. α`-martensite was formed by cold rolling, and it was formed with surface relief and specific direction or crossing each other. The volume fraction of martensite increased by subzero treatment, and it was increased with longer time of subzero treatment and higher temperature of subzero treatment. The hardness and strength increased by subzero treatment, while the elongation decreased. With the increase of volume fraction of martensite, the hardness and strength was increased steeply with proportional relationship, elongation was decreased slowly. The results show that the hardness and strength was strongly controlled by the volume fraction of martensite, and the elongation was affected by transformation behavior of deformation induced martensite in the initial stage of deformation.
이여주 ( Yeo Joo Lee ),초가기 ( Jia Qi Chu ),이서용 ( Seo Yong Lee ),김수미 ( Su Mi Kim ),이광녕 ( Kwang Nyeong Lee ),고영준 ( Young Joon Ko ),이향심 ( Hyang Sim Lee ),조인수 ( In Soo Cho ),남석현 ( Seok Hyun Nam ),박종현 ( Jong H 한국동물위생학회 2011 한국동물위생학회지 (KOJVS) Vol.34 No.2
Foot-and-mouth disease (FMD) is one of the most infectious diseases affecting cloven-hoofed animals including cattle, sheep, goats, and pigs. Seven serotypes of foot-and-mouth disease virus with multiple subtypes within each serotype have been identified until now. In particular, it has been demonstrated that the outbreak of the serotype Asia1 reported from China, Mongolia and North Korea since 2005 is mostly classified into genetic group V. Though it has been recommended that Asia1 Shamir strain can be used as a high priority vaccine by World References Laboratory for FMD, the complete nucleotide sequences of the strain has not yet been determined. In this study, to be prepared for Asia1 type viruses that may be brought into Korea, the complete genome sequence of this vaccine strain Asia1 Shamir including its 5` and 3` non-coding region was identified.
이여주 ( Yeo Joo Lee ),초가기 ( Jia Qi Chu ),이서용 ( Seo Yong Lee ),김수미 ( Su Mi Kim ),이광녕 ( Kwang Nyeong Lee ),고영준 ( Young Joon Ko ),이향심 ( Hyang Sim Lee ),조인수 ( In Soo Cho ),남석현 ( Seok Hyun Nam ),박종현 ( Jong H 한국동물위생학회 2011 한국동물위생학회지 (KOJVS) Vol.34 No.2
Asia1/Shamir that has been recommended by World Reference Laboratory for foot-and-mouth disease (FMD) is used as a vaccine strain, and is being prepared in many countries including Korea. Although it is assumed that vaccine strain Asia1/Shamir has a wide antigenicity, sufficient molecular biological analysis has not been accomplished yet. Complete genome sequence analysis showed that the region with the most severe variations was 1D region of structural protein-coding sequence; particularly amino acid 141~157 residues in 1D region RGD sites for binding to susceptible cells. In addition, five amino acids in 1D region were identified as characteristic sites that are different from other known Asia1 viruses. Asia1/Shamir strain was shown to be genetically similar to group VI that had occurred in the Middle East, but showed low level of genetic similarity to the group V viruses that had occurred in the Southeast Asia and China. It is considered that, if these viruses, group I and II including group V are introduced into Korea, care would be paid in case of inoculating the vaccine strain Shamir available in Korea.
호앙구엔 ( Dung H. Nguyen ),민은엔 ( Duc T. M. Nguyen ),라련화 ( Lyun Hwa La ),이향복 ( Hyang Bok Lee ),신정현 ( Jung Hyun Shin ),김은기 ( Eun Ki Kim ) 대한화장품학회 2008 대한화장품학회지 Vol.34 No.3
미백제를 선발하기 위해 주로 사용하는 현재의 방법은 in vitro 타이로시네이즈 활성 및 항산화능을 측정하는 것이다. 이 결과에 기초하여 다음 단계인 멜라노사이트에서의 멜라닌 생성량을 측정한다. 세포 내의 멜라닌 생성량 측정법은 시간, 인력 및 숙련도가 요구된다. 따라서 초기 선발 방법의 신뢰성이 중요하다. 200개 중국시료 중 측정범위 내에서 세포독성이 없는 34개를 대상으로 세포 내 멜라닌량, 타이로시네이즈 활성, 항산화능의 상관관계를 조사하였다. 조사결과 직선의 상관관계를 확인할 수 없었다. 이 결과는 현재 선발방법의 한계 및 새로운 방법이 필요함을 보여주었다. Initial screening assay for depigmenting agents includes in vitro mushroom tyrosinase assay and antioxidant assay. Based on this screening result, melanin synthesis in melanocyte, in screened samples, is further measured. Measuring cellular melanin needs time, human resource, and skills. Therefore initial screening method should be reliable. We examined 34 Chinese herbs, correlated the screening assay methods with cellular melanin. No reliable relationship was observed between factors, indicating the limitation in the use of these assays, probably due to the complexicity of melanogenesis.
Preisach 모델을 이용한 수직자기기록장치의 재생특성 해석
박관수(G. S. Park),이향범(H. B. Lee),한송엽(S. Y. Hahn),이택동(T. D. Lee),장평우(P. W. Jang) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.1
Numerical method for analyzing the reading process in magnetic recording system is described. Hysteresis characteristics must be included in numerical analysis not only recording process but also reading process because of hysteretic behavior of recording media. Algorithm which is consisted of finite element method for numerical analysis and Preisach model considered to be more appropriate method than Stoner-Wohlfarth model with spin curling mode for describing hysteresis characteristics is constructed. Equations to calculate waveform of reproduced voltage is proposed. Then, this is applied to perpendicular magnetic recording systems with pole type head and double layer media. Waveform of magnetic flux density and reproduced voltage induced in head coil is obtained. If the recording current increase in recording process, magnitude of reproduced voltage in reproducing process saturates. From this saturation curve, value of current which produce maximum voltage can be obtained.