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Anoxygenic photosynthesis. Sulfide is used as a reducing agent during photosynthesis in green and sulfur bacteria. Energy in the form of sunlight. The light dependent reactions take place when the light excites a reaction center, which donates an electron to another molecule and starts the electron transport chain to produce ATP and NADPH.
Arsenic(+3) fuels anoxygenic photosynthesis, such as in hot spring biofilms of Mono Lake, California. Anoxygenic photosynthesis, or photosynthesis that does not produce oxygen and is common with photosynthetic bacteria and certain cyanobacteria, uses electron donors other than water to reduce CO 2 for incorporation into biomass.
Green sulfur bacteria are nonmotile (except Chloroherpeton thalassium, which may glide) and capable of anoxygenic photosynthesis. [5] [6] They live in anaerobic aquatic environments. [7] In contrast to plants, green sulfur bacteria mainly use sulfide ions as electron donors. [8]
Light-dependent reactions are certain photochemical reactions involved in photosynthesis, the main process by which plants acquire energy. There are two light dependent reactions: the first occurs at photosystem II (PSII) and the second occurs at photosystem I (PSI). PSII absorbs a photon to produce a so-called high energy electron which ...
All organisms produce a phosphate compound, ATP, which is the universal energy currency of life. In photophosphorylation, light energy is used to pump protons across a biological membrane, mediated by flow of electrons through an electron transport chain. This stores energy in a proton gradient. As the protons flow back through an enzyme called ...
Chlorobium chlorochromatii. Chlorobium chlorochromatii, originally known as Chlorobium aggregatum, is a symbiotic green sulfur bacteria that performs anoxygenic photosynthesis and functions as an obligate photoautotroph using reduced sulfur species as electron donors. Chlorobium chlorochromatii can be found in stratified freshwater lakes.
Purple bacteria are anoxygenic because they do not use water as electron donor to produce oxygen. Purple sulfur bacteria (PSB), use sulfide, sulfur, thiosulfate or hydrogen as electron donors. [21] In addition, some species use ferrous iron as electron donor and one strain of Thiocapsa can use nitrite. [22]
Photoheterotroph. Photoheterotrophs (Gk: photo = light, hetero = (an)other, troph = nourishment) are heterotrophic phototrophs —that is, they are organisms that use light for energy, but cannot use carbon dioxide as their sole carbon source. Consequently, they use organic compounds from the environment to satisfy their carbon requirements ...