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담배 현탁배양 세포에 있어 Polyamine 과 Ethylene 생합성시 중간산물로서 S - Adenosylmethionine 의 역할
박기영(Ky Young Park),이순희(Sun Hi Lee) 한국식물학회 1990 Journal of Plant Biology Vol.33 No.2
The role of S-adenosylmethionine(SAM) as an intermediate in interrelation between polyamine and ethylene biosynthesis was studied in suspension cultures of Nicotiana tabacum L. Exogenous SAM stimulated the polyamine and ethylene biosynthesis in 4 days-cultured cells, which were in active cell divisions, and 10 day cultured cells, which went on with active cell elongation and senescence. SAM-induced ethylene production was more effective in 10 day-cultured cells than in 4 day-cultured cells, but SAM-induced polyamine biosynthesis was more effective in 4 day-cultured cells than in 10 day-cultured cells. Polyamine contents were increased by the blockage of ethylene biosynthetic pathway in the conversion of SAM to ethylene via 1-aminocyclopropane-1-carboxylic acid(ACC) with aminooxyacetic acid (AOA). Also, ethylene production was increased by the inhibitors of polyamine biosynthesis such as methylglyoxal bis-(guanylhydrazone) (MGBG), dicyclohexylamine (DCHA), α-difluorome-trylarginine (DFMA) and α-difluoromethylornithine (DFMO). These results suggest that there may be interrelations between polyamine and ethylene biosynthesis for the competition of SAM and the inherent mechanism of switch on-off in polyamine and ethylene biosynthetic activity with the progress of cell growth and senescence.
담배 ( Nicotiana tabacum L. ) 현탁배양 세포에서 DNA 합성에 미치는 Polyamine 의 효과
남경희(Kyoung Hee Nam),박기영(Ky Young Park),이순희(Sun Hi Lee) 한국식물학회 1993 Journal of Plant Biology Vol.36 No.1
Effects of polyamines on DNA synthesis were studied in synchronized culture of Nicotiana tabacum L. When DFMO and DFMA, inhibitors of ornithine decarboxylase and arginine decarboxylase, respectively were initially applied to the cells, the polyamine contents were rapidly drooped and [methyl-^3H] thymidine incorporation into DNA was markedly reduced during the early stage of culture period. Inhibition of DNA synthesis, however, was partially reversed when these inhibitors were applied simultaneously with putrescine. In addition, exogenous administration of putrescine also increased the DNA syntheses during the all over the culture period. In vitro activity of DNA polymerase from Nicotiana tabacum L. was promoted by increasing concentrations of polyamines in the reaction mixture. Maximal activity was shown at 5 mM putrescine, 0.5 mM spermidine and spermine, respectively. Lack of Mg^2+ ion in the reaction buffer resulted in an inhibition of the enzyme activity by about 30%. The inhibition could not be completely reversed by application of polyamines at optimal concentrations. These results suggest that polyamines promote the DNA synthesis in vivo and in vitro by stabilizing the DNA-helix upon binding to negatively charged groups on DNA or increasing the activity of DNA polymerase in Nicotiana tabacum L.
담배 현탁 배양세포에서 Ethylene 생합성에 미치는 Polyamine 의 작용기작 (作用機作)
이순희(Sun Hi Lee),박기영(Ky Young Park) 한국식물학회 1988 Journal of Plant Biology Vol.31 No.4
We investigated the activities of choline kinase, CTP: phosphorylcholine cytidyltransferase, and phosphatase during the greening of etiolated barley seedlings. Activities of choline kinase in leaves increasd until 6 hours after illumination and decreased considerably after 6 hours, while activities of CTP: phosphorylcholine cytidyltransferase increased after illumination. On the contrary, changes of these two enzymatic activities showed reverse pattern in roots. The activities of phosphatase which hydrolyze phosphorylcholine decreased in leaves but changed little in roots during greening. The concentration of phosphorylcholine increased in xylem exudate and in roots during greening, while decreased in leaves. These results suggested that more phosphorylcholine arrive in leaves from roots as greening of etiolated barley seedlings.
강신명(SM Kang),이순배(SB Rhee),박기영(KY Park),김인숙(IS Kim) 대한산부인과학회 1967 Obstetrics & Gynecology Science Vol.10 No.3
Aseptic technique or reduction of the bacterial flora on the pudendal area in delevery preparation still requires constant re-evaluation. In this paper a new class of disinfectant, the amphoteric surface active agent, hygiene(TEGO 1 03 G) is applied to prepare the perineal area and it`s effects were compared with other varies con- ventional agents and were evaluated clinically by the incidence of transient episotomy fever or sub- clinical infection of clean surgical incision-episiotomy(Showing transient elevation of body tempe- rature orally up to 37`c. or more, lasting less than 4 hours any time in postpartum 3 days period but excluding all othe febrile sources) as well as in vitro study. The data to be presented are based on 169 primiparas deliveried in Ewha Womans University Hospital, Seoul, Korea(33 suing Hygiene, 15 with Mercurochrome, 13 with Cresol, 30 soap and water, 29 soap and water plus prophylactic systemic antibiotics). From this study following conclusions have been reached. 1.The effect of pudendal perineal aseptic technic or disinfectant best can sharply be compared and evaluated clinically by the incidence of transient episiotomy fever or subclinical infection of clean incision-episiotomy(Showing transient fever of 37`c. or more orally in any time of postpart- um 3 days period, but excluding all other febrile sources) rather than by gross episiotomy wound infection which is often encontering many different criterias or even by in vitro biocides effect alone which is also proven to be incorrect unless using serial basin bethod or neutralizing, reducing age- nts. 2.The transient episiotomy fever(Subclinical infection) is strongly correlated with quantitative bacterial innoculation as well as it`s types. It suggested that the most responsible pathogens were staphylococcus aureus and some Streptococcus. On the other hand E. coli appeared to be relatively non-causeative one in the pudendal perineal area; probably female perneum resistant particularly to the normally inhabiting enteric microorganisms. 3.1% Hygiene(TEGO 103G) was superior to a rapid physol wash, Mercurochrome or Cresol wa- sh in reducing subclinical infection of clean episiotomy(tranisent fever) mostly acused by Staphyloc- occus aureus. It seemed also sensitive to Streptococcus. 4.Routine prophylactic antibiotics reduced some transient dpisiotomy fever, but not all of the inc- idence of higher temperatures presumably caused by massive bacterial innoculations. Proper aseptic perineal technic will prevent the clinicl infection of episiotomy wound and subclinical transient episiotomy fever as well. The corection of low hemoglobin level should also be considered in this aspect.
비전센서를 이용한 머플러 TWB 레이저 용접에서의 실시간 용접선 추적 및 품질검사 연구
유보현(BH Ryu),김용(Y Kim),박기영(KY Park),이경돈(KD Lee),김석진(SJ Kim) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
This research was conducted as a fundamental study to apply tailor welded blank technique into automotive production process. Specially we tried to apply the TWB technique to exhaust system. Seam tracking and inline monitoring method using laser vision sensor were studied in this paper. Seam tracking process has to be operate at the same time with laser welding because it performs the function of correcting the beam path error prior to shooting the laser beam. On the other hand, in case of quality monitoring, it is the most important to define the defects on laser butt welding process. Therefore, in In this study, we were selected the suitable system for performing the seam tracking and quality monitoring by defined functions. After the verification of the performance was carried out through a basic experiment for the selected system.
Chlamydomonas 에서 분리한 DNA Methylase 와 엽록체 DNA Methylation
김남곤(Nam Gon Kim),김재윤(Jae Yoon Kim),이순희(Sun Hi Lee),이강오(Kang Oh Lee),김영민(Young Min Kim),박기영(Ky Young Park) 한국식물학회 1992 Journal of Plant Biology Vol.35 No.4
Two kinds of DNA methylases were purified from Chlamydomonas 21 gr(mt^+) gametic cells to determine the DNA methylases related to chloroplast DNA methylation and to examine their affinities for various DNAs. Two DNA methylases had distinct physical properties under the same condition of pH and ionic strength, and had different molecular weights as determined on a nondenatured gradient polyacrylamide gel electrophoresis. As the two enzymes had similar enzymatic activities on λ phage DNA and non-methylated λ DNA, it is suspected that they may act on cytosine methylation. In contrast with DNA methylase Ⅰ, DNA methylase Ⅱ showed a higher methyl-incorporation rate into poly(dG-dC)·poly(dG-dC) than poly(dA-dC)·poly(dG-dT). Therefore, it may have a greater affinity for (G-C) sequence than (A-C). When chloroplast DNA was isolated from Chlamydomonas in the vegetative and gametic stages and the activities of DNA methylase Ⅰ and Ⅱ were examined on these DNAs, they revealed 20% and 10% lower rates, respectively, of methyl-incorporation into the gametic chloroplast DNA than into the vegetative DNA.