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포머의 냉간 후방압출 공정을 위한 금형 소재의 충격 특성 평가
노남수(N. S. Rho),박은기(E. K. Park),박효영(H. Y. Park),최정묵(J. M. Choi) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.10
This study is for the backward extrusion process of cold forging. In the backward extrusion process, the material flows in the opposite direction to the upper punch. The work piece is formed either in the cavity formed between the punch and die, or in the cavity of the punch. Backward extrusion is used to produce circular inside and outside diameters, squares with rounded corners, multiple outside diameters and multiple inside diameters. In this process, unique loads applied on the tool. This loads are reduce tool life cycle. We evaluate load applied to the tool using the FEM simulation, and impact property of materials for cold-forging die.
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Myo-inositol이 돼지 난모세포의 체외성숙에 미치는 영향
조인식,한효원,이상미,박효영,정영희,문승주,강승률,강만종 충남대학교 형질전환복제돼지연구센터 2004 논문집 Vol. No.8
본 연구는 미성숙 돼지 난모세포의 체외 성숙에 있어서 myo-inositol의 영향을 알아보기 위하여 실시하였다. 미성숙 돼지 난모세포을 myo-inositol을 포함하는 또는 포함하지 않은 체외 성숙배지에서 44시간 체외 성숙을 유도하였을 때 성숙율은 myo-inositol을 첨가한 성숙배지에서 성숙시킨 실험구에 유의하게 높았다(P<0.05). Myo-inositol에 의한 성숙율 향상에 있어서 난구세포의 영향을 알아보기 위하여 난추세포의 치밀도에 따라 분류하여 미성숙 난모세포을 myo-inositol을 포함하는 체외 성숙배지에서 배양하였을 때 난구세포가 치밀한 미성숙 난모세포에서가 더 높은 성숙율을 나타내었다(P<0.05). 그러나 난구세포가 치밀하지 않은 미성숙 난모세포도 myo-inositol을 포함하는 성숙배지에서 배양하면 성숙율은 대조구에 비하여 유의하게 높았다(P<0.05). 이러한 결과는 돼지 난모세포의 체외 성숙배지에 myo-inositol의 첨가는 체외 성숙율을 향상시킬 수 있음을 나타내고 있다. This study was carried out to assess whether the addition of myo-inositol to maturation medium could improve porcine oocyte maturation in vitro. Oocytes were cultured for the first 22 h in Witten's medium containing lO1U/ml PMSG, 10 IU/ml HCG supplemented with or without myo-inositol. Subsequently, they were cultured for additional 22 h in Witten's medium without hormone supplemented with or without myo-inositol. When the porcine oocytes were cultured in maturation medium containing myo-inositol, the proportion of metaphase II oocytes 44h after culture was higher in the myo-inositol group(P<O.05). To study effects of cumulus cell on the maturation induced by myo-inositol, we examined the maturation status of cumulus-enclosed or cumulus-denuded porcine follicular oocytes. The rates of maturation were significantly higher in the cumulus-enclosed oocytes(P<O.05). However, the maturation rates of cumulus-denuded oocytes cultured in medium containing myo-inositol were higher than those of control group(P<O.05). Our results suggest that myo-inositol may affect meiotic progression of porcine follicular oocytes and supplementation of myo-inositol in maturation medium may be useful for the in vitro maturation of porcine follicular oocytes.
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정영희,이상미,박효영,윤두학,최재관,문승주,강만종 한국동물자원과학회 2004 한국축산학회지 Vol.46 No.1
The peroxisome proliferator-activated receptor r(PPARr), a member of the steroid/thyroid nuclear hormone receptor suferfamily of ligand-activated transcription factor, is an important regulator of adipocyte gene expression and differentiation. In this studies, we report the identification, characterization, and expression of a Hanwoo PPARr gene. The PPARr cDNA sequence of the Hanwoo show strong conservation with the corresponding sequences reported in other species except of three amino acid sequences. The distribution of PPARr mRNA in various tissues of Korean cattle aged 12 months were investigated using Northern Blot analysis. The higher expression was detected in adipose tissue, more lower expression was detected in colon, small intestine, kidney, lung, while expression was not detected in brain, heart. PPAR? expression was higher in adipose tissue of Korean cattle when aged 30 months than aged 12 months. These results indicated PPARr, regulator adipocyte gene expression and differentiation, related on adipose differentiation in Korean native cattle(HANWOO).
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임신 중인 생쥐 자궁에 있어서 아라키돈산에 특이적인 Acyl-CoA Synthetase 4의 발현
이상미,박효영,정영희,문승주,강만종 충남대학교 형질전환복제돼지연구센터 2004 논문집 Vol. No.8
본 연구는 생쥐 자궁에 있어서 아라키돈산으로부터 prostaglandin의 생성에 관여하는 것으로 추측되는 acyl-CoA sytnhetase 4 유전자의 임신단계별 발현을 확인하고자 실시하였다. acyl-CoA sytnhetase 4 유전자는 착상 전에는 발현이 증가하는 경향을 나타내었으며 착상 후에는 감소하였다. 이러한 발현의 양상은 세포막의 인질로부터 아라키돈산을 유리시키는 cPLA2의 발현과 유리된 아라키돈산으로부터 prostaglandin의 생성에 관여하는 COX1과 COX2의 발현 양상과 일치하였다. 이러한 결과는 세포막에서 유리된 아라키돈산이 무한적으로 COX1과 COX2에 의하여 prostaglandin의 생성에 이용되는 것이 아니라 acyl-CoA sytnhetase 4에 의하여 세포막의 인지질로 되돌려져 prostaglandin의 생성을 조절하는 기능을 세포가 수행하고 있는 것으로 추정된다. This study was conducted to determine expression of acyl-CoA synthetase 4(ACS4), which is involved in converts arachidonic acid to postaglandins, in the mouse uterus during pregnancy. In arachidonic acid metabolism, acyl-CoA synthetase plays a key role in the esterification of free arachidonic acid into membrane phospholipids. Following its release by the action of calcium dependent phospholipases, free arachidonic acid is believed to be rapidly converted to arachidonoyl-CoA and reesterified into phospholipids in order to prevent excessive synthesis of prostaglandins. Here we demonstrate that ACS4 gene are differentially regulated in the peri-implatation mouse uterus. During the preimplantation period(days 0.5∼3.5), the ACS4 gene was expressed in the uterus until day 3.5 after which the expression was downregulated. The expression of cPLA2, COXl, and COX2 gene was similar to that of ACS4 gene in the preimplantation periods. However expression levels of COX1 gene show much variation on the various days of pregnancy examined. These data, suggest that ACS4 expression in preimplantation period is involved in initial attachment reaction with cPLA2, COXl, and COX2 gene.
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