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$1-{\beta}-D-Arabinofuranosylcytosine$이 Mouse의 간세포소기관(肝細胞小器官)에 미치는 영향(影響)
김수연,이규식,Kim, S.Y.,Lee, K.S. 한국현미경학회 1983 Applied microscopy Vol.13 No.1
[ $1-{\beta}-D-Arabinofuranosylcytosine$ ](ara-C), which is a pyrimidine nucleoside analog is cytotonic to mammalian cells in culture and is active in vitro and in vivo against a variety of DNA viruses. The precise mechanism of action of ara-C has not been determined, although ara-C is thought to act as an antimetabolite, interfering with the synthesis of deoxyribonucleic acid(DNA). Cytosine arabinoside originally seemed to act principally by inhibiting the conversion of cytidine to deoxytidine, thus inhibiting DNA synthesis. But recent data suggest that effects upon DNA polymerase and effects via incorporation into DNA and RNA may well be of equal importance. The author have demonstrated the effect of cytosine arabinoside on the hepatocytes of albino mice treated with ara-C, observing changes in the cytoplasmic organelles of the hepatocytes. A total of 120 healthy male albino mice were divided into the control and ara-C treated groups. The animals of the ara-C group were given 10mg. per kg of body weight of mouse ara-C in physiological saline solution and the animals of control group were given physiological saline solution, intraperitoneally. After an administration of ara-C or physiological saline solution, the animal were killed at. interval of 6, 12, and 24 hours. The specimens, which were obtained from the left anterier lobe of the liver, were stained with uranyl acetate and lead citrate and observed with JEM 100B electron microscope. The results were obtained as follow: A pronounced dilatation, sacculation and fragmentation of the cisterane of rough endoplasmic reticulum with dissociation of membrane bound-ribosomes, disaggregation of free ribosomes in the cytoplasm, proliferation of the smooth endoplasmic reticulum associated with depletion of glycogen paracles, atrophies of Golgi complex, production of numerous lipid droplets, and formation of antophagic vacuoles, multivesicular bodies and residual bodies are recognized in the hepatocytes of ara-C treated mice. Consequently it is suggested that cytosine arabinoside would induce a changes of the cytoplasmic organelles of the hepatocytes in albino mice.
새로운 Open System Interconnection 하위계층 프로토콜 표준화 동향 분석
김수연,박정수,강신각,Kim, S.Y.,Park, J.S.,Kang, S.G. 한국전자통신연구원 1994 전자통신동향분석 Vol.9 No.3
ISO/IEC JTC1 SC6는 전기통신 및 시스템간 정보교환과 관련되는 국제작업을 수행하는 전문기관이며 이것의 하부기관인 WG4는 OSI 제 4계층인 수송계층 국제표준을 개발하고 있다. 본 고에서는 이러한 기관의 기본적인 활동에 대하여 분석하고 그중 WG4의 수송계층 프로토콜 향상 작업에 대하여 설명하였다. 이러한 작업은 하위계층의 우수한 성능을 충분히 이용하고 상위계층에 다양한 기능을 제공함으로써 향후 멀티미디어 서비스를 제공할 수 있는 수송계층을 만들자는데 그 목적이 있다.