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Yin, Q.Q.,Chang, J.,Zuo, R.Y.,Chen, L.Y.,Chen, Q.X.,Wei, X.Y.,Guan, Q.F.,Sun, J.W.,Zheng, Q.H.,Yang, X.,Ren, G.Z. Asian Australasian Association of Animal Productio 2010 Animal Bioscience Vol.23 No.2
In order to improve the availability of phytase and probiotics together, a phytase gene from Aspergillus ficuum has been expressed in Lactobacillus. In this study, the transformed Lactobacillus with phytase gene was fed to pigs to determine its effect on pig production, feed conversion and gut microbes. Forty eight, 60-day-old, castrated pigs (Duroc${\times}$Landrace${\times}$Pietrain) were assigned to 6 groups, 8 pigs for each group. Group 1 was the control, group 2 was added with chlortetracycline (500 mg/kg), group 3 was added with the transformed Lactobacillus (500 mg/kg) with 20% (w/w) of calcium monohydrogen phosphate (CMP, $CaHPO_{4}$) removed, group 4 was added with the natural Lactobacillus (500 mg/kg) with 20% (w/w) of CMP removed, group 5 was added with the transformed Lactobacillus (500 mg/kg) with 40% (w/w) of CMP removed, group 6 was added with phytase (500 mg/kg) with 40% (w/w) of CMP removed. The results showed: i) the average daily gain (ADG) was improved in groups 2, 3 and 4 (p<0.05); ii) the diarrhea rates in the groups added with Lactobacillus were lower than in the other groups (p<0.05), in which the transformed Lactobacillus had more effect on reducing digestive disease; iii) the transformed Lactobacillus was most effective in improving the digestibilities of crude protein (CP), calcium (Ca), phosphorus (P), compared with the other groups (p<0.05); iv) Lactobacillus could increase lactic acid bacterium number and ammonia concentrations, and decrease pH values and E. coli number in pig feces (p<0.05); v) the phytase activity in the feces of pigs fed with the transformed Lactobacillus was 133.32 U/g, which was higher than in group 4 (9.58 U/g, p<0.05), and was almost the same as group 6 (135.94 U/g); vi) the transformed Lactobacillus could increase serum concentrations of IgA, triglyceride, and glutamic oxaloacetic transaminase activity (p<0.05), and had no significant effect on other serum indexes (p>0.05).
ZhEng, D. W.,Huang, Y. P.,Tang, T. A.,Cui, Q.,Li, A. Z.,Zhou, S. X.,He, Z. J.,Chen, Z.,Zhang, X. J.,Kwor, R. 대한전자공학회 1993 ICVC : International Conference on VLSI and CAD Vol.3 No.1
A novel process for silicon on insulator(SOI) technology has been presented. Single crystal Si is grown by molecular beam epitaxy(MBF) on a porous silicon(PS) system consisting of two layers of PS with different microstructures. Subsequent lateral oxidation converts the structure to SOI wish excellent insulation property. Si islands with a width of 135㎛ and low doping concentration have been achieved.
A Damage Model for Assessing Pipeline Safety in Corrosion Environments
Zhao, X. W.,Luo, J. H.,Zheng, M.,Lu, M.X.,Li, H.L 대한금속학회 2002 METALS AND MATERIALS International Vol.8 No.5
Considering such practical pipeline service conditions in the petroleum transportation field as corrosion from harmful media (H_2S, CO_2 etc.) and load from the pressure of flowing petroleum as key factors, the degradation of the mechanical properties of pipeline steels and the corresponding variations in stress states are studied. A damage variable is introduced to reflect the degradation in the mechanical properties of the pipeline due to corrosion. A diluted solution approach is proposed to model the corrosion process of harmful media within the pipeline and the distribution of the damage variable along the radial direction of the pipeline is derived. An approach to the safety evaluation of damaged pipeline is proposed by comparing the instant properties of pipeline steels with servicing conditions.
Evaluation of the Aerodynamic Performance of A Hybrid Mesh Based Finite Volume Code
ZHENG, H.W. The Society for Aerospace System Engineering 2015 International Journal of Aerospace System Engineer Vol.2 No.2
A hybrid mesh based finite volume compressible flow code (PolySim) has been developed recently. Instead of the simple average method for the gradients of variables at each face, the volume average is applied for the calculation of the viscous flux. What is more, an improved Green Gauss method for the calculation of the gradient is also presented. These two techniques will improve both the accuracy and robustness of the code. The aerodynamic performance of this in-house cell centered code is examined by several widely-used bench-mark test cases. These cases include flows over flat plate and RAE 2822 etc. The comparisons on results between calculation and experiment are conducted. They show that the code can produce good numerical results which agree well with the corresponding experiment data.
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.