Heliobacterium modesticaldum (H. modesticaldum) is an anaerobic photoheterotroph that can produce molecular hydrogen (H2) when it is fixing dinitrogen (N2). In addition, electrons can be injected into this organism via an electrode and redox mediator in a light-dependent fashion, as shown recently by the Redding and Jones research groups. These factors make H. modesticaldum an ideal organism for use in a microbial photoelectrosynthesis cell, in which electricity can be used to power specific metabolic processes that produce a desired compound (e.g. H2).
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