Microscale Snapshot of the Substrate

The physical appearance of the substrate bed changes during the process as the microorganism grows. The processes responsible for this change are described in Sect. 2.5. This section gives a "snapshot" view of the fermentation in the middle of the growth process. Of course, the substrate bed is quite complex in structure. As shown in Fig. 2.4(b), it contains a three-dimensional arrangement of substrate particles, inter-particle spaces, and microbial biomass.

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