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생쥐에 있어서 투명대의 용해성과 분리할구의 발생 가능성에 관한 연구
양보석,임경순,이용빈 ( B . S . Yang,K . S . Im,Y . B . Lee ) 한국축산학회 1985 한국축산학회지 Vol.27 No.11
The present study was carried out to investigate the cloning of mouse embroys. Female ICR micx were superovulated by intraperitonial injection of PMSG and HCG. Two- and four-cell embryos were digested by proteolytic enzymes; pronase, trypsin, protease and pepsin, and lipase, and separated in vitro by fine glass needles with hand and isolated blastomeres were cultured in vitro for 72 hours. The results obtained were summarized as follow; 1. The proteolytic enzymes had been shown to cause dissolution of zona pellucida, but lipase didn`t. 2. In two-cell mouse embryos, the rate of dichotomy was 89.7% and 97.6 k in zona softened and removed, respectively. Among the dichotomized two-cell mouse embryos, one half and both halves undamaged blastomeres were 30.8% and 57.9% in zone softened and 12.2% and 85.4% in zona removed, respectively. 3. In four-cell mouse embryos, the rate of dichotomy was 85.3% and 96.0% in zona softened and removed. The rate of 4:0, 3:1, 2:2 and 1:3 (undamaged blastomeres vs. damaged blastomeres) were 8.8%, 15.7%, 42.2% and 18.6% in zona softened and 16.8%, 30.9%, 35.6% and 12.8% in zona removed, respectively. 4. The developmental rate of zona softened and removed single blastomeres was 68.5% and 69.0% in 2cell embryo, and 46.7% and 38.5% in 4-cell embryo, respectively. And the developmental rate of zona softened and removed single blastomeres was 10.5% and 6.9% in 2~ell embryo, and 0% and 0% in 4-cell embryo, respectively. The blastomeres isolated from 2-cell embryo developed into blastocyst, but that from 4-cell embryo developed into 8-cell stage, respectively.
梁保錫(B. S. Yang),安永供(Y. K. Ahn),崔沅鎬(W. H. Choi) 한국해양공학회 1992 韓國海洋工學會誌 Vol.6 No.2
This paper presents an approach for the derivation of frequency-dependent element matrices for vibration analysis of piping systems containing a moving medium. The dynamic stiffness matrix is deduced from transfer matrix, and, in turn, the frequency-dependent element matrices are derived. Numerical examples show that this method gives more accurate results than those obtained using the conventional static shape function based element matrices.