TABLE 1.

Summary of studies on direct interspecies electron transfer (DIET) in defined co-culture.

Defined co-culture	Electron donor	Electron acceptor	Mediator	References
G. metallireducens and M. barkeri	Ethanol	CO2	Activated carbon, e-pili and OmcS	Liu et al., 2012
G. metallireducens and M. harundinacea	Ethanol	CO2	E-pili and OmcS	Rotaru et al., 2014b
G. metallireducens and M. barkeri	Ethanol	CO2	GAC, e-pili and OmcS	Rotaru et al., 2014a
G. metallireducens and G. sulfurreducens	Ethanol	Fumarate	Carbon cloth, e-pili and OmcS	Chen et al., 2014a
G. metallireducens and G. sulfurreducens	Ethanol	Fumarate	Biochar, e-pili and OmcS	Chen et al., 2014b
G. metallireducens and G. sulfurreducens	Ethanol	Fumarate	Magnetite, e-pili and OmcS	Liu et al., 2015
G. metallireducens and M. barkeri	Ethanol	CO2	E-pili and OmcS	Holmes et al., 2018
G. metallireducens and G. sulfurreducens	Ethanol	Fumarate	OmcS	Liu et al., 2021