- Clostridium thermocellum JN4 and Thermoanaerobacterium thermosaccharolyticum GD17 - Lactate to butyrate
- Caldicellulosiruptor saccharolyticus and Rhodopseudomonas palustris - Acetate
- co-cultured dark- and photo-fermenting bacteria
- Saccharomyces cerevisiae and Escherichia coli - formate
- Amino acids exchange using combined dark- and photo-fermentation