What is carbon fixation?

Carbon Fixation

In biology, carbon fixation is the reduction of inorganic carbon (carbon dioxide) to organic compounds by living organisms. The most prominent example is photosynthesis. Organisms that grow by fixing carbon are called autotrophs—plants for example. Heterotrophs, like animals, are organisms that grow using the carbon fixed by autotrophs. Fixed carbon, reduced carbon, and organic carbon all mean organic compounds.

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Some articles on carbon fixation:

Light-independent Reactions
... are chemical reactions that convert carbon dioxide and other compounds into glucose ... are three phases to the light-independent reactions, collectively called the Calvin cycle carbon fixation, reduction reactions, and ribulose 1,5-bisphosphate (RuBP) regeneration ... is available independent of the kind of photosynthesis (C3 carbon fixation, C4 carbon fixation, and Crassulacean Acid Metabolism) CAM plants store malic acid in their vacuoles every night and release it by ...
Carbon Fixation - Other Reduced Carbon
... Non-biological carbon fixation is of interest, according to Graham Cairns-Smith, in the study of the origins of life ...
RuBisCO - Regulation of Its Enzymatic Activity - Regulation By Carbon Dioxide
... Since carbon dioxide and oxygen compete at the active site of RuBisCO, carbon fixation by RuBisCO can be enhanced by increasing the carbon dioxide level in the compartment containing RuBisCO (chloroplast stroma) ... times during the evolution of plants, mechanisms have evolved for increasing the level of carbon dioxide in the stroma (see C4 carbon fixation) ... healthy leaves in bright light may have zero net carbon fixation when the ratio of O2 to CO2 reaches a threshold at which oxygen is fixed instead of carbon ...
C3 Carbon Fixation
... C3 carbon fixation is a metabolic pathway for carbon fixation in photosynthesis ... This process converts carbon dioxide and ribulose bisphosphate (RuBP, a 5-carbon sugar) into 3-phosphoglycerate through the following reaction CO2 + RuBP → (2) 3-phosphoglycerate ... In C4 plants, carbon dioxide is drawn out of malate and into this reaction rather than directly from the air ...
Phosphoenolpyruvate Carboxylase - PEP Carboxylase in Photosynthesis
... anhydrase, PEP carboxylase assimilates the available bicarbonate into a four-carbon compound (oxaloacetate, which is further converted to malate) that can be stored or shuttled between plant cells ... This allows for a separation of initial carbon fixation by contact with air and secondary carbon fixation into sugars by RuBisCO during the light-independent reactions of photosynthesis ... cells of the leaf and the resulting four-carbon compound, malate, is shuttled into the bundle sheath cells where it releases CO2 for fixation by RuBisCO ...