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Chlorobia
The green sulfur bacteria are a phylum, Chlorobiota, of obligately anaerobic organism, anaerobic photoautotrophic bacteria that metabolize sulfur. Green sulfur bacteria are motility, nonmotile (except ''Chloroherpeton thalassium'', which may glide) and capable of anoxygenic photosynthesis. They live in anaerobic aquatic environments. In contrast to plants, green sulfur bacteria mainly use sulfide ions as electron donors. They are autotrophs that utilize the reverse Krebs cycle, reverse tricarboxylic acid cycle to perform carbon fixation. They are also mixotrophs and reduce nitrogen. Characteristics Green sulfur bacteria are Gram-negative bacteria, gram-negative rod or spherical shaped bacteria. Some types of green sulfur bacteria have gas vacuoles that allow for movement. They are photolithoautotrophs, and use light energy and reduced sulfur compounds as the electron source. Electron donors include , , S. The major photosynthetic pigment in these bacteria is Bacteriochlorophyll ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chlorobaculum Tepidum
''Chlorobaculum tepidum'', previously known as ''Chlorobium tepidum'', is an anaerobic, thermophilic green sulfur bacteria first isolated from New Zealand. Its cells are gram-negative and non-motile rods of variable length. They contain chlorosomes and bacteriochlorophyll a and c. Natural habitat and environmental requirements Like other green sulfur bacteria ''C. tepidum'' requires light and specific compounds to perform anoxygenic photosynthesis. ''C. tepidum'' differs from other green sulfur bacteria in that it cannot easily use H2 or Fe2+ as electron donors, relying on elemental sulfur, sulfide, and thiosulfate instead. To fulfill their metabolic requirements, they reside primarily in anaerobic sulfur rich environments such as anaerobic levels of Stratification (water), stratified lakes and lagoons, anaerobic levels of layered organic bacterial mats, and in hot springs where there is abundant sulfur. ''C. tepidum'' and other green sulfur bacteria also play a large role wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
