cyclic electron flow
A route of electron flow during the light reactions of photosynthesis that involves only photosystem I and produces ATP but not NADPH or oxygen.
cyclin ...
In cyclic electron flow, the electron originates in a pigment complex called photosystem I, passes from the primary acceptor to ferredoxin, then to a complex of two cytochromes (similar to those found in mitochondria), ...
"Cyclic electron flow around photosystem I is essential for photosynthesis". Nature 429 (6991): 579-82. PMID 15175756.
^ Miziorko H, Lorimer G (1983). "Ribulose-1,5-bisphosphate carboxylase-oxygenase". Annu Rev Biochem 52: 507-35.
Cyclic Electron Flow occurs in some eukaryotes and primitive photosynthetic bacteria. No NADPH is produced, only ATP. This occurs when cells may require additional ATP, or when there is no NADP+ to reduce to NADPH.
 See also: ATP, Oxygen, Membrane, Action, NADPH
  
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