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Purple bacteria are phototrophic proteobacteria that use bacteriochlorophyll and carotenoids for photosynthesis. They are divided into purple sulfur bacteria and purple non-sulfur bacteria based on their sulfide tolerance and utilization, and can perform different metabolic pathways depending on oxygen and light conditions.
Learn about the characteristics, ecology, and metabolism of purple sulfur bacteria, a group of anaerobic or microaerophilic photosynthetic bacteria that use sulfur as an electron donor. Find out how they are distributed in stratified water environments and how they affect nutrient cycling and temperature regulation.
Learn about the history, applications, and mechanisms of UVGI, a disinfection technique using UV light to kill or inactivate microorganisms. Find out how UVGI can be used for air, surface, water, and food disinfection, and how it can inactivate SARS-CoV-2.
Rhodobacter sphaeroides is a purple bacterium that can perform photosynthesis and respiration. It has two chromosomes, five plasmids, and many small RNAs that regulate its metabolism and stress response.
Anoxygenic photosynthesis is a form of photosynthesis used by some bacteria and archaea, which differs from oxygenic photosynthesis in plants in the reductant and byproduct used. Learn about the types, pigments, reaction centers, and examples of anoxygenic photosynthesis.
Photoinhibition is light-induced reduction in the photosynthetic capacity of plants, algae, or cyanobacteria, especially Photosystem II. Learn about the history, the different mechanisms, and the repair cycle of photoinhibition from this Wikipedia article.
American microbiologist Carl Woese established this grouping in 1987, calling it informally the "purple bacteria and their relatives". [12] The group was later formally named the 'Proteobacteria' after the Greek god Proteus, who was known to assume many forms. [13]
Gram stain is a technique that uses different colors to distinguish between gram-positive and gram-negative bacteria based on their cell wall properties. It can also be used to diagnose fungal infections and is a common tool in microbiology laboratories.