||John A. Raven Functional evolution of photochemical energy transformations in oxygen-producing organisms, Functional Plant Biology, 2009, 36, 505–515 p.505 left column top paragraph
||Raven JA (2009) Contributions of anoxygenic and oxygenic phototrophy and chemolithotrophy to carbon and oxygen fluxes in aquatic environments. Aquatic Microbial Ecology, in press.
||These organisms that use water
as their electron donor use two photochemical reactions in series
(Hill and Bendall 1960) to move electrons to NADP+ and then
to CO2, and pump H+ across the photosynthetic membrane:
the ratio of absorbed photons used : electrons :H+ is 2 : 1 : 3
(Allen 2003, 2004 Falkowski and Raven 2007) BNID 105037. These
organisms account for over 99.9% of photosynthetic primary
productivity on Earth (Raven 2009).