Anaerobic photosynthesis

R. capsulatus strains were cultured by respiration (aerobic, dark) or by photosynthesis (anaerobic, light) on PYE medium containing 2 mM of MgCl2 and 2 mM of CaCl2 (MPYE) and supplemented with antibiotics when... 

Bacterial Photosynthesis A light-dependent, anaerobic mode of metabolism. Carbon dioxide is reduced to glucose, which is used for both biosynthesis and energy production. Depending on the hydrogen source used to reduce COj, both photolithotrophic and photoorganotrophic reactions exist in bacteria. 

In photosynthetic bacteria, (i.e., Chlorobiaceae) the bacteriochlorophyUs support photosynthesis at low light intensities, and they accomplish this activity by using a unique antenna complex known as a chlorosome in which the pigments are located. Since these bacteria are strict anaerobes, photosynthesis is nonoxygenic. ... 

T. roseopersicina is a phototrophic purple sulphur bacterium the strain marked BBS has been isolated from the cold water of the North Sea. Its anaerobic photosynthesis uses reduced sulphur compounds (sulphide, thiosulfide, or elementary sulphur), but it can also grow on organic compounds (sugar, acetate) in the dark. The bacterium contains a nitrogenase enzyme complex, thus it is capable of fixing atmospheric N2, a process accompanied by H2 production [Vignais et al., 1995],... 

Long-term aim of our project is the construction of a biomolecular device for hydrogen production in combination with light-driven water-splitting as it occurs in the natural process of photosynthesis in plants. Such a semiartificial device should combine the best suited components found in various native systems which - up to now - cannot be found in an individual native system due to incompatibilities and/or different origin (pro- and eukaryotic, meso- and thermophilic, aerobic - anaerobic environment). Advantage of such a system is... 

Continuum of metabolic strategies. AnAnP, anaerobic anoxygenic photosynthesis OP, oxygenic photosynthesis AAnP, aerobic anoxygenic photosynthesis RP/PC, rhodopsin and other pigments HT, heterotroph DOM, dissolved organic matter. Source-. From Filer, A. (2006). Applied Environmental MIoroblology, 42(12), 7431-7437. 

The same types of anaerobic bacteria that produced natural gas also produce methane today. Anaerobic bacteria are some of the oldest forms of life on earth. They evolved before the photosynthesis of green plants released large qnantities of oxygen into the atmosphere. Anaerobic bacteria break down or digest organic material in the absence of oxygen and produce biogas as a waste product. 

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