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DNA 분석을 통한 한우 , 연변황우 및 화우의 유전적 특성
신원집,여정수,김재우,신수길,정진우,이지홍 한국축산학회 1999 한국축산학회지 Vol.41 No.4
This study was conducted to identify the genetic parameters and genetic relationships among 3 cattle breeds of Hanwoo (Korea), Yanbian yellow cattle (China), and Wagyu (Japan). DNA fingerprinting was prepared using M13 probe and Pst 1 enzyme. Genetic homogencities of Hanwoo and Yanbian yellow cattle were comparatively lower than that of Wagyu, suggesting genetic improvement by active breeding program for Wagyu compared to Hanwoo and Yanbian yellow cattle and possibility of improvement capacity for Hanwoo and Yanbian yellow cattle. Genetic similarities between breeds were not significantly different among them, suggesting that these 3 breeds have been raised independently without any inflow or outflow of gene source for a while.
EXPERIMENTAL STUDY ON REGENERATING FOULED EGR COOLER BY NTPI TECHNOLOGY
Y. Y. CHEN,Y. X. CAI,X. H. LI,Y. X. SHI,Y. ZHENG 한국자동차공학회 2015 International journal of automotive technology Vol.16 No.2
In order to investigate the regeneration effect of non-thermal plasma injection (NTPI) technology on fouled exhaust gas recirculation (EGR) cooler, NTPI regeneration apparatus and EGR cooler performance test system were built up. Results showed that non-thermal plasma (NTP) could peel off the deposit layer and improve the heat exchange performance effectively. The carbon removal energy efficiency of this NTPI regeneration setup was 22.46 g/kWh and the O3 utilization ratio was 96.50%. To get a deeper understanding of the regeneration effect, thermo-gravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FTIR) were introduced to investigate the variation of deposit layer’s physical and chemical characteristics before and after regeneration. Results showed that the content of soluble organic fraction (SOF) in deposit specimen decreased obviously, mainly because the carbonyls were effectively removed by NTP. Moreover, soot in deposit specimen was successfully activated by NTP.
Confocal microscopic findings of cysteine protease calpain in Plasmodium falciparum
Choi, Y.Y.,Jung, S.Y.,Cho, P.Y.,Soh, B.Y.,Zheng, B.,Kim, S.Y.,Park, K.I.,Park, H. Academic Press 2010 Experimental parasitology Vol.124 No.3
Pf-calpain, a cysteine protease of Plasmodium falciparum, is believed to be one of the central mediators for essential parasitic activity. However, the roles of calpain on parasitic activity have not been determined in P. falciparum. In the present study, the localization of Pf-calpain was investigated using polyclonal antibodies (anti-Pf-calpain antibody A and B) against peptides that distinguished it from human calpain-7 and rat calpain-10 protein. Recombinant Pf-calpain (rPf-calpain) was identified as a 46kDa protein using an anti-Pf-calpain antibody A, which can recognize the Pf-calpain binding site. Confocal microscopy revealed calpain within cytoplasmic localized parasites in the erythrocytic cycle. The findings suggested that the expression of Pf-calpain would be proportional to all different parasites in the erythrocytic cycle. On the other hand, anti-human calpain-7 antibody detected Pf-calpain in schizonts, and the immunofluorescence was stronger than with anti-rat calpain-10 antibody. However, the antibodies reacted with calpains in human red blood cells. These results show that anti-Pf-calpain antibody A and B specifically recognize only Pf-calpain. Taken together, the results suggest that Pf-calpain is expressed in all erythrocytic stages. In particular, the expression of Pf-calpain is increased much more when the late ring matures into the early trophozoite. Moreover, anti-Pf-calpain antibody A and B against synthetic peptides of the catalytic domain of Pf-calpain are useful to specifically detect Pf-calpain in all erythrocytic stages, while human and rat calpain antibody are not useful.
Short track cyclic m-cycle systems of for K_n,n for m=0(mod 4)
Y. Zheng,Y. Ji 장전수학회 2007 Advanced Studies in Contemporary Mathematics Vol.14 No.1
Let Kn,n denote the complete bipartite graph with n vertices in each part. In this paper, we will determine necessary and sufficient conditions for the existence of Short Track cyclic m-cycle systems of Kn,n for integers 30 < m 100 and m 0 (mod 4).
A combined stochastic diffusion and mean-field model for grain growth
Zheng, Y.G.,Zhang, H.W.,Chen, Z. Techno-Press 2008 Interaction and multiscale mechanics Vol.1 No.3
A combined stochastic diffusion and mean-field model is developed for a systematic study of the grain growth in a pure single-phase polycrystalline material. A corresponding Fokker-Planck continuity equation is formulated, and the interplay/competition of stochastic and curvature-driven mechanisms is investigated. Finite difference results show that the stochastic diffusion coefficient has a strong effect on the growth of small grains in the early stage in both two-dimensional columnar and three-dimensional grain systems, and the corresponding growth exponents are ~0.33 and ~0.25, respectively. With the increase in grain size, the deterministic curvature-driven mechanism becomes dominant and the growth exponent is close to 0.5. The transition ranges between these two mechanisms are about 2-26 and 2-15 nm with boundary energy of 0.01-1 J $m^{-2}$ in two- and three-dimensional systems, respectively. The grain size distribution of a three-dimensional system changes dramatically with increasing time, while it changes a little in a two-dimensional system. The grain size distribution from the combined model is consistent with experimental data available.