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The kinetics of batch and fed-batch cultures of recombinant Escherichia coli producing human-like collagen was investigated. In the batch culture, a kinetic model of a simple growth-association system was concluded without consideration of cell endogeneous metabolism. The cell lag time, the maximum specific growth rate and growth rates were set at (0.15, 0.2, 0.25h-1) by the method of pseudo-exponential feeding, and the expressions for the specific rate of substrate consumption, the growth kinetics and the product formation kinetics of each phase spectively. The model predictions are in good agreement with the experimental data. 相似文献
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The kinetics of batch and fed-batch cultures of recombinant Escherichia coli producing human-like collagen was investigated. In the batch culture, a kinetic model of a simple growth-association system was concluded without consideration of cell endogeneous metabolism. The cell lag time, the maximum specific growth rate and Yx/s were determined as 1.75h, 0.65h^-1 and 0.51g·g^-1, respectively. In the fed-batch culture, different specific growth rates were set at (0.15, 0.2, 0.25h^-1) by the method of pseudo-exponential feeding, and the expressions for the specific rate of substrate consumption, the growth kinetics and the product formation kinetics of each phase were obtained. The result shows that the concentrations of cell and product can reach 77.5g·L^-1 and 10.2g·L^-1 respectively. The modal predictions are in good agreement with the experimental data. 相似文献
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本研究运用动态再结晶诱发超塑性的原理,对未经细化晶粒预处理的常规生产热轧态2091Al-Li合金直接进行高温拉伸,试验结果表明合金在470~530℃温度范围和2×10~(-4)~1×10~(-3)应变速率范围内具有超塑性,最大断裂延伸率达405%。根据光镜和电镜组织观察和真应力—真应变曲线的单一峰值和变形激活能随应变量增大而下降等特征,讨论了动态再结晶诱发超塑性的机制。 相似文献
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