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백금촉매를 이용한 polycarbosilane - vinylsilane 세라믹 전구체의 합성과 열분해 특성에 관한 연구
황택성,임정훈,강윤욱 ( T . S . Hwang,J . H . Lim,Y . U . Kang ) 한국공업화학회 1997 응용화학 Vol.1 No.1
The yield of vinylsilane-polycarbosilane ceramic precursors was increased with the increase of reaction temperature, concentration of monomer and catalyst. It was also observed that the molecular weight of ceramic precursor was increased with vinyl contents in the PCS. It was found that the ceramic precursors of vinylsilane-polycarbosilane were synthesized from the absorption peak of 2100㎝^(-1), Si-H bond, to decrease and the peak of 1600㎝^(-1), C=C bond, to increase with reaction by FT-IR, spectrometer. It was observed that organic structure of the β-SiC was converted to crystalline structure over 1000℃ with pyrolysis.
난구세포와의 공배양이 돼지 체외수정란의 초기발달에 미치는 영향
한만희,임정훈,박병권,이규승 충남대학교 농업과학연구소 1996 농업과학연구 Vol.23 No.2
This study was conducted to investigate the effects of coculture for the development rate to morula/blastocyst stages of early porcine embryos, derived from oocytes matured and fertilized in vitro, with porcine cumulus cell monolayers(PCM) in the two different media, respectively. The rates of embryos developed to 2-, 4-, 8~16-cell and morula/blastocyst stage were 48.7, 40.5, 34.8 and 17.0% in Ham's F-10 with PCM, and 48.3, 35.6, 22.1, and 13.4% in TCM-HEPES with PCM, respectively. The above development rates to morula/blastocyst stages were significantly higher than those of the embryos cultured in the Ham's F-10 and TCN-HEPES without PCM(P<0.05). The in vitro development rates to the morula/blastocyst stage of 1-cell embryos cultured in Ham's F-10 and TCM-HEPES without PCM were 0.0~1.0%. Especially, most of embryos were observed to arrest the development beyond 4-cell stages. As shown in the above results, the coculture in vitro fertilized porcine embryos with PCM in the two different media enhanced the development of fertilized eggs to morula/blastocyst stages in vitro. However, we didn't find out any difference for the in vitro development to morula/blastocyst stages between Ham's F-10 and TCM-HEPES media.