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Polygoum Tinctoria와 합성 인디고 염료의 물리화학적 특성 비교
최창용,장미경,공병기,최혜영,나상권,이동병,양숙향,나재운 한국공업화학회 2002 응용화학 Vol.6 No.2
The natural dye substances appear to have a lot of benefits that enable the dyed materials to exhibit their natural colors. It may have a bit of a harmful influence on the human body itself, in comparison with the synthetic substances. It also causes hardly any environmental pollution because of the natural chemicals and costs much less to disposal. In this study was investigated physicochemical characterization of polygoum tinctoria dye substance and synthetic indigo. Calcium hydroxide was added into polygoum tinctoria leaves to precipitate dye substances and it was freezing dried into powder form. Characterizations of dye substances were investigated by UV/VIS spectrophotometer, TLC, DSC, TGA, HPLC, and MALDI-TOF Mass. Resultantly, polygoum tinctoria was confirmed that is consisted of two ingredients from these results.
DFD용 Pilot disk 고주기 피로 수명 특성 평가
공병석(Byung-suk Kong),박태원(Tae-won Park) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
고객의 승차감 및 조안성에 대한 기대를 충족시키기 위하여 현가 장치에 대한 성능 향상 필요하다. 따라서 현가 장치 내부에는 2way 방식의 샌드위치 밸브를 적용하여 차량의 튜닝 자유도를 높인 Dual Flow Damper (DFD)를 적용하고 있다. 본 연구에서는 DFD 내부에 적용되는 Pilot disk의 신규 개발을 목적으로 수행하였다. 현가 장치는 상시 하중이 인가되는 부품으로 높은 피로 수명 특성이 요구 된다. 따라서 Pilot disk에 횡하중 및 종하중에 대한 피로 시험을 각각 수행하였으며, 두 종류 시험 결과 개발품이 현 양산품 대비 우세한 피로 특성을 갖고 있음을 확인할 수 있었다.
Effects of anti-mullerian hormone supplementation on cryopreserved and transplanted ovarian tissues
Hyun Sun Kong,Jaewang Lee,Eun Jung Kim,Hye Won Youm,Jung Ryeol Lee,Byung Chul Jee,Chang Suk Suh,Seok Hyun Kim 한국발생생물학회 2014 한국발생생물학회 학술발표대회 Vol.2014 No.9
Ovarian tissue cryopreservation and transplantation causes follicle depletion. To overcome this problem, we investigate the effect of Anti-Müllerian hormone (AMH), a follicle recruitment control hormone, supplementation before and/or after mouse ovarian transplantation. A total of 120 5-week-aged BD F-1 female mice were used. The mice were randomly divided into four groups according to AMH doses (0, 5, 25, 125 μg/mL, respectively). AMH was injected intraperitoneally on every other day for a week before, after, or before and after transplantation of ovaries under kidney capsules was performed. One week after transplantation, follicular normality was evaluated by histological analysis and TUNEL assay. In Group A and C, morphologically intact follicle (G1) ratios of AMH treated groups showed no statistically significant difference. In Group B, G1 ratios of 25 and 125 μg/mL of AMH treated groups were higher than those of 5 μg/mL treated group, but there was no improvement in G1 ratio after AMH treatment. In every group, apoptotic follicle ratios did not show any trend according to AMH treatment. Proportions of primordial follicle were not significantly different according to AMH treatment in all groups. The result of the present study demonstrated that AMH treatment during on transplantation of cryopreserved ovaries has no significant effect on follicle survival and prevention of follicle depletion.