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이상길,이정복,유성미,박종철,최재봉,김정구,Lee, S.G.,Lee, J.B.,Yu, S.M.,Park, J.C.,Choi, J.B.,Kim, J.K. 대한의용생체공학회 2006 의공학회지 Vol.27 No.5
We examined the effects of ${\beta}$-glucan-reinforced PLGA film and scaffold on HDFs (human dermal fibroblast) attachment and proliferation. The PLGA films were prepared by simple solvent-casting method. The prepared films were grafted with $(1{\to}3)(1{\to}6)-{\beta}-glucan$ in various ratios after plasma treatment on surface. The surface of the film was characterized by contact angle measurement, scanning electron microscope (SEM), and Fourier-transform infrared spectrophotometer (FT-IR). The amount of $(1{\to}3)(1{\to}6)-{\beta}-glucan$ in the prepared film was indirectly determined by phenol-sulfuric acid method. The HDFs (Human dermal fibroblasts) were used to evaluate the cell attachment and proliferation on PLGA specimens before and after plasma/${\beta}-glucan$ treatment. The result showed that the plasma treated groups exhibited more mont of ${\beta}-glucan$ might be grafted than the non plasma treated groups. Cell attachment was significantly enhanced in the plasma/${\beta}-glucan$ grafted group after 4 hours incubation (p<0.05) due to the improved hydrophilicity and cytoactivity effect of the ${\beta}-glucan$. The cell proliferation of plasma/${\beta}-glucan$ (2mg/ml) grafted group was the highest rate among the groups (p<0.05).
이광전(K . J . Lee),최재봉(J . B . Choi),이상기(S . K . Lee),최윤석(Y . S . Choi),박경도(K . D . Park) 한국축산학회 1992 한국축산학회지 Vol.34 No.6
Milk records on 639 Holstein cows with first lactation during 1986 to 1991 from Korea Animal Improvement Association were used to estimate genetic parameters and genetic and phenotypic correlations among milk, fat, and protein yields. These records were adjusted to 305 days, two times, and months of calving years. The estimates for heritabilities from multivariate REML were 0.18 and 0.13 for milk yield and fat yield. Also, the heritabilities for milk, fat, and protein yields from multivariate REML were 0.20, 0.286, and 0.572, respectively. The heritability of protein yield was considerably higher than those of other yield traits. The genotypic correlation with milk and protein yield was higher than that of milk and fat yield. The selection index derived from the estimated parameters and economic weight based on the milk price by milk and fat percent was I₁ =3.49X_m + 102.51X_f. Supposing that the price of the differential protein percent were 8 and 9 Won, then, the indices were I₂=-2.22X_m + 2.40X_f + 92.05X_p and I₃=-2.08X_m + 2.26X_f + 86.39X_p, respectively. (X_m=milk yield (㎏), X_f=fat yield (㎏), X_p=protein yield (㎏).
이광전(K . J . Lee),강민구(M . G . Kang),박경도(K . D . Park),강민식(M . S . Kang),최재봉(J . B . Choi) 한국축산학회 1994 한국축산학회지 Vol.36 No.6
Three thousand two hundred twenty-one linear type records, 3,298 production records and 1,652 type-production records of Holsteins in Korea collected from 1984 to 1994 by the KAIA (Korea Animal Improvement Association) were analyzed to estimate genetic parameters as well as genetic and phenotypic correlations among type and production traits using multivariate REML. The heritabilities for milk and fat yield adjusted to 305 days were 0.31±0.07 and 0.26±0.06, respectively. The genetic correlation between milk and fat yields was 0.82 and the phenotypic correlation was 0.75. Linear type scores were low, especially for udder traits. The heritabilities for type traits ranged from 0.10 for udder support to 0.54 for stature. Rear udder height had the highest positive genetic correlation with rear udder width(0.72), whereas foot angle had the highest negative genetic correlation with rear legs side view(-0.36). Angularity, foot angle, rear udder width and teat placement had high genetic correlations with milk yield(0.31, 0.41 and -0.32, respectively). Rump angle, foot angle and rear udder width had high genetic correlations with fat yield(-0.37, -0.50 and 0.39, respectively).
이광전(K . J . Lee),박경도(K . D . Park),강민식(M . S . Kang),강민구(M . G . Kang),이연근(Y . K . Lee),조광현(K . H . Cho),최재봉(J . B . Choi) 한국축산학회 1993 한국축산학회지 Vol.35 No.6
This study was undertaken to identify the changes of variance components for herd production levels of milk. Milk records were divided into low, medium, and high groups by average herd production, average herd-year production, herd standard deviation, and herd-year standard deviation. Herd standard deviations increased with average herd productions. Correlation between average herd production and herd standard deviation was 0.41, while correlation between average herd-year production and herd-year standard deviation was 0.47. Residual variance components of higher production increased remarkably, while genetic variance components of high group by herd-year standard deviation showed the same increasing trend. When records are transformed to logarithms, however, residual components of variance didn`t show the increasing trend, and the changing ratio decreased markedly without homogeneous variance components. In order to account for the heterogeneity of milk among herds, the optimum classifying criterion was an average herd-year production level. Estimates of heritabilities for low, medium and high groups were 0.185, 0.237, and 0.283, respectively. These results remarkably showed the heterogeneity of milk among dairy herds.