http://www.popsci.com/environment/article/2009-08/energy-producing-microbe-evolves-more-efficient-strain-could-lead-new-fuel-cell-designs
The article discusses that a microbe named Geobacter can be used to extract energy from mud which can be used in a fuel cell. The research team from the University of Massachusetts have observed the microbe can generate electricity when it is placed in mud and waste water. The species has been altered a few times so that it can produce more electricity.
The primary research that I feel could be used for this article could be that of the article entitled "The genome of Geobacter bemidjiensis, exemplar for the subsurface clade of Geobacter species that predominate in Fe(III)-reducing subsurface environments". The scientists talk about how the Geobacter has a large metabolic rate. The article also states that other environmental stresses affect the rate of its metabolism such that it can increase or decrease.
http://apps.isiknowledge.com.offcampus.lib.washington.edu/full_record.do?product=WOS&search_mode=GeneralSearch&qid=3&SID=1AKlbNd4FpkDkd9eo@1&page=1&doc=6
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