4. Conclusion
This paper represents a significant step toward establishing automated repetitive batch (ARB) fermentation as a tool to study microbial cellulose utilization. Using a model cellulosic substrate, a marked acceleration was observed with successive medium replacement cycles as well as a proportional relationship between CO2 production and cellulose consumed. Notably, results were similar for a pure culture of C. thermocellum and an environmental consortium. Promising directions for future research include examination of changes during the acceleration period, characterization of the phylogenetic composition of mixed consortia, use of more complex lignocellulosic substrates such as switchgrass, and rate comparisons under different growth conditions.