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Calvin cycle - Biology - InfoEscola
The Calvin cycle, also known as the carbon cycle is a cyclic chain of chemical reactions that occurs in the chloroplast stroma, in which there is the formation of carbohydrates after fixation and reduction of carbon dioxide. It was first described by Melvin Calvin and his colleagues performed experiments to identify when the path made by the carbon dioxide absorbed by the plants.
However carbon circulates nature as inorganic carbon in the composition of carbon dioxide from atmospheric air, now in the form of carbon chains of the organic compounds (proteins, lipids, carbohydrates, etc.), integrating as organic carbon, the material of living beings . It is therefore an abiotic passage through a passage and for living systems.
This cycle occurs in plants and can be described in detail as follows: after reduction of NADP + to NADPH in the process of photophosphorylation and acyclic phosphorylating ADP + Pi to ATP in the acyclic or cyclic photophosphorylation process that occurs during bacillus anthracis the clear photosynthesis, is that carbon dioxide bacillus anthracis is combined with the pentose-ribulose diphosphate bacillus anthracis (RUDP), giving bacillus anthracis rise to a compound six carbons, intermediate and unstable.
As a result of its instability, this compound readily yields two molecules of phosphoglycerate, also known as phosphoglycerate (PGA), formed by three carbons. The ATP, in turn, phosphorylates the two molecules being subsequently reduced by NADPH, which is part of the light phase of photosynthesis. These reactions originate aldehyde fosfoglicérico (PGAL). Of twelve molecules formed PGAL ten are used in the regeneration of ribulose, the other remaining two are used in the formation bacillus anthracis of organic compounds such as carbohydrates, for example. Therefore, it is necessary that the cycle occurs twice for orginar a glucose molecule.
Sources: http://pt.wikipedia.org/wiki/Ciclo_de_Calvin http://www.knoow.net/ciencterravida/biologia/ciclodecalvin.htm http://sites.google.com/site/correiamiguel25/obten% C3% % C3% A7% C3% A3odemat A9rianasplantas http://www.biologados.com.br/botanica/fisiologia_vegetal/fotossintese_ciclo_calvin.htm
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