Difference between purple and green photosynthetic bacteria
Answers
Purple sulfur bacteria (PSB) are photosynthetic and reduce carbon dioxide to carbohydrates using hydrogen sulfide instead of water. In addition to the growth of PSB, high sulfide concentrations and high ammonia concentrations promote the growth of green sulfur bacteria. The presence of PSB typically indicates septicity, and a bloom of bacteria may contribute to high effluent total suspended solids. To control PSB in a facultative lagoon, an increase in dissolved oxygen concentration is required. Green sulfur bacteria are strict anaerobes that are capable of photosynthesis. Green sulfur bacteria absorb longer wavelengths of light than purple sulfate bacteria. Green sulfur‐reducing bacteria also occur in anaerobic, sulfate‐containing environments including wetlands and overloaded facultative lagoons. Purple and green sulfur bacteria are one of the four major groups of sulfur bacteria, and they belong in the group of phototrophic bacteria.