carbon fixation


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carbon fixation

The reduction of CO2 to organic compounds by living organisms—classically equated to photosynthesis, which requires sunlight and H2O as an electron donor, converting inorganic carbon (CO2) into organic compounds.
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Succinyl-CoA is converted to acetyl-CoA that is fed back into the cycle, with the net result of generating glyoxylate as the carbon fixation product, which is converted to pyruvate (Herter et al., 2002).
In C3 plants, respiration rates increase in the light, a process termed photorespiration, and this increased use of photosynthesis decreases the efficiency of carbon fixation. The first contact of C[O.sub.2] with enzymes after entering the leaves is at the spongy parenchyma, where PEP carboxylase predominates.
With these low bacterial densities, the stoichiometric P requirement due to photosynthetic carbon fixation is higher than the P ingestion due to bacterial grazing.
Although Moso bamboo stand stored a lower amount of carbon in the vegetation floor than Chinese fir and Masson pine stands (Table 5), the annual carbon fixation amount in Moso bamboo stand was greater than that in Chinese fir and Masson pine stands.
Autotrophic carbon fixation and extremophily are recognized to be two likely hallmarks of primordial organisms (Hugler et al., 2003; Pakchung et al., 2006).
Carbon Fixation Carbon dioxide and water are the raw materials for the photosynthetic production of glucose (see Chapter 7).
The results showed that it is missing the entire set of genes needed for photosystem II and carbon fixation, essential parts of the molecular machinery that carries out photosynthesis in plants and cyanobacteria.
Directions: Carbon Fixation = Carboxylation step; Rubisco (the minister) joins the two together to form a 6-carbon compound.
The significance of such CaC[O.sub.3] formation and precipitation is unknown because coccolithophorid contribution to global photosynthetic carbon fixation is unknown.
It involves an entirely new metabolic loop in the process of carbon fixation that turns chemical energy into simple sugars, and its evolution required major anatomical changes.
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