Electron Transfer Pathway from Water to NADP in photosynthesis

T1 - The question of the primary electron acceptor in bacterial photosynthesis.

Primary electron acceptors in plant photosynthesis [25]

Advances inPhotosynthesis and Respiration Volume 20, 2005, pp 275-281 Discovery of pheophytin function in the photosynthetic energy conversion as the primary electronacceptor of ... * Final gross prices may vary according to local ...

What is the final electron acceptor in photosynthesis?

Photosynthesis Research 04-2003, Volume 76, Issue 1-3, pp 247-253 Discovery of pheophytin function in the photosynthetic energy conversion as the primary electronacceptor of Photosystem...* Final gross prices may vary according to lo...

Only between 2.2 and 2 billion years ago, the earth's atmosphere started to enrich in molecular oxygen released from the oxygenic photosynthesis of cyanobacteria; around 1.8 billion ...Normally, the electron flow from the excited phot...


The Question of the Primary Electron Acceptor in …

The redox potentials Em(QA/QA-) of the primary quinone electron acceptor QA in oxygen-evolving photosystem II complexes of three species were determined by spectroelectrochemistry. The Em(QA/QA-) values were experimentally found to be -162±3mV for a higher plant spinach, -171±3mV for a green alga Chlamydomonas reinhardtii and -104±4mV vs. SHE for a red alga Cyanidioschyzon merolae. On the basis of possible deviations for the experimental values, as estimated to differ by 9-29mV from each true value, plausible causes for such remarkable species-dependence of Em(QA/QA-) are discussed, mainly by invoking the effects of extrinsic subunits on the delicate structural environment around QA.

As in oxygenic photosynthesis, electron transfer is coupled to the ..

The technique of flash kinetic spectrophotometry was used to demonstrate a broad absorption band around 430 nm, which was kinetically different from P700, in several photosystem-I particles from spinach and blue-green algae. The component represented by this absorption band, designated as “P430”, was bleached as fast as P700. Its recovery in the dark was accelerated by ferredoxin and by various artificial electron acceptors with redox potentials as low as -521 mV. The recovery kinetics have been demonstrated to be identical to those of a concomitant reduction of several of the artificial electron acceptors used. Tentatively, “P430” has been proposed as a possible primary electron acceptor of photosystem I.

Final electron acceptor in photosynthesis | scholarly …

First oxygen, because it has the most positive reduction potential,therefore the energy fall between the energy source (say acetate) and theterminal electron acceptor would be greatest.

Final electron acceptor in photosynthesis ..

Explain this observation. There is not enough of an electronpotential drop between NH4+, H2S, or Fe+2and the other electron acceptors to easily generate enough PMF.

15) Some bacteria, like spp , can use a numberof different electron acceptors, including oxygen, nitrate and iron oxides.