Direct interspecies electron transfer (DIET) has biogeochemical significance, and practical
applications that rely on DIET or DIET-based aspects of microbial physiology are growing.
Mechanisms for DIET have primarily been studied in defined cocultures in which Geobacter
species are one of the DIET partners. Electrically conductive pili (e-pili) can be an important
electrical conduit for DIET. However, there may be instances in which electrical contacts are
made between electron transport proteins associated with the outer membranes of the …