- Caldicellulosiruptor saccharolyticus
- Strictly anaerobic, extreme-thermophilic, gram positive
- Hydrogen production inhibited by hydrogen, sucrose, sodium acetate, potassium acetate, sodium lactate, sodium chloride, potassium chloride (http://lup.lub.lu.se/luur/download?func=downloadFile&recordOId=132847&fileOId=931433)
- Rhodopseudomonas palustris
- Gram negative
- Photosynthetic
- It grows with or without oxygen and uses many alternative forms of inorganic electron donors
- generates hydrogen as a product of nitrogen fixation
- Acetate as a carbon source for hydrogen production by photosynthetic bacteria