FRANCIS LEROY & VALENTIN LEGRAND, BIOCOSMOS / SCIENCE PHOTO LIBRARY FRANCIS LEROY & VALENTIN LEGRAND, BIOCOSMOS / SCIENCE PHOTO LIBRARY
Photosynthesis and redox potentials. Animation showing the different values of the redox potential (values down left) of the main components which operate during photosynthesis. Extraction of the electrons from water (H2O) require a very high value of this potential. After stimulation by photons, the value of the redox potential in photosystem II (left) is sufficient to allow the electrons (e-minus) to be transported through intermediates (centre, Q [plastoquinone] and pC [plastocyanin]) to photosystem I where the process is again energised by photons from sunlight. This results in the reduction of NADP-plus to NADPH (reduced nicotinamide adenine dinucleotide phosphate). The energy lost by electrons travelling from photosystem II to photosystem I is in part recovered by a proton pump (centre) to create a proton gradient. This energy from this process is stored in molecules of ATP (adenosine triphosphate).
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