Coculture Model for Current Production in the Dark (image) Arizona State University Share Print E-Mail Caption Figure 2 shows a coculture model for current production in the dark. A: In the light, Chlorobium photosynthetically accumulates glycogen (red particles) using electrons derived from sulfide oxidation. B: In the dark, Chlorobium ferments glycogen to acetate, which is consumed by Geobacter to produce electric current. Credit The Biodesign Institute at Arizona State University Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.