By Urs von Stockar (Editor), Luuk van der Wielen (Editor)
Procedure integration has been the most energetic examine fields in Biochemical Engineering over the past decade and it'll stay so if bioprocessing is to develop into extra rational, effective and efficient. This quantity outlines what has been completed in recent times. Written through specialists who've made vital contributions to the ecu technology, beginning software on approach Integration in Biochemical Engineering, the quantity specializes in the growth made and the foremost possibilities, and likewise at the boundaries and the demanding situations in bioprocess integration that lie forward. the concept that of bioprocess integration is taken care of at numerous degrees, together with integration on the molecular, organic, bioreactor and plant degrees, but in addition accounting for the mixing of separation and mass move operations and biology, fluid dynamics and body structure, in addition to simple technology and procedure expertise.
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Thus, at least the concentration fields for the carbon and energy source are credible and provide a unique resource for predicting the corresponding operating conditions of the bioreactor. However, the situations may become more sophisticated if uptake systems with stronger links to the nonlinear network dynamics are considered. The important example of the phosphoenol-dependendent phosphotransferase system (PTS) in Escherichia coli is discussed next to illustrate this level of complexity. The reaction scheme shown in Fig.
Also, a first attempt towards kinetic analysis of the PTS system will be presented. Figure 24 shows the extracellular glucose concentration after the continuous culture has been disturbed by the pulse of glucose. At a first glance, this part of the dynamic response is neither surprising nor really interesting. What can be observed is a remarkable increase of flux, which results in acetate excretion (not shown) after a short time delay. There are, however, clear signs that the initial response points to a delay in the abrupt increase of the uptake.
32)). (4) Solution of a balance equation for the specific gas hold-up: ∂eG ∂eG Ê ∂eG ˆ + uiG Á Deff ˜ + SG Ë ∂t ∂ xi ∂ xi ¯ with SG = (33) V˙G Vi at the location of the gas sparger. There are two main drawbacks of gas-liquid flow simulations based on the algebraic slip approach. Calculation of the gas hold-up with Eq. (33) implies the assumption that the gas phase does not occupy any volume and the gas bubbles do not cause expansion of the volume of the system. Some correction for improving the situation can be performed with the aid of an estimated gas hold-up for the calculation of a reduced mixture density and a volume expansion for the single-phase simulation.