Microbial Biofuels: Current Production and Future Prospects

Introduction

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Introduce the topic of your paper. What microorganisms are of interest? Habitat? Applications for medicine and/or environment?

Current Microbial Biofuels: Ethanol Produced by Fermentation

Figure 1. An overview of glycolysis. A single molecule of glucose is oxidized to two molecules of pyruvate. Pyruvate can then be decarboxylated to form acetaldehyde, which can act as the terminal electron receptor under anoxic conditions in S. cerevisiae to produce ethanol.

Image source: http://www.sciencedirect.com/science/article/pii/S0734975007001000 [3]

Alternative Ethanol-Producing Microorganisms: Zymomonas mobilis and Escherichia coli

Figure 2. Strains of Zymomonas mobilis capable of inefficient xylose fermentation were cultured for an extended period of time in medium containing both glucose and xylose, to select for the ability to ferment xylose more efficiently. After an extended period of time, the strain A3 was separated from A1, and cultured in xylose-only medium. Here A1 and A3 were cultured independently in medium containing 5% glucose with or without 5% xylose. A1 only grew quickly when glucose fermentation could occur, but A3 grew quickly when either glucose or xylose fermentation was possible. Black squares represent overall cell mass, blue triangles represent "glucose only" experiments, red circles represent glucose and xylose experiments, filled circles represent A1, empty cirles represent A3.

Image source: http://onlinelibrary.wiley.com/doi/10.1002/bit.23021/full [1]

References

[Sample reference] Takai, K., Sugai, A., Itoh, T., and Horikoshi, K. "Palaeococcus ferrophilus gen. nov., sp. nov., a barophilic, hyperthermophilic archaeon from a deep-sea hydrothermal vent chimney". International Journal of Systematic and Evolutionary Microbiology. 2000. Volume 50. p. 489-500.

Edited by student of Joan Slonczewski for BIOL 238 Microbiology, 2011, Kenyon College.