H2s

6S0 + 12e" + 12H+

hu + pigmenta

[pigment+ + e~\a

19(ADP + Pj) + [pigment + + e~]a

10ATP + pigmenta

3ATP + CO2 + 4e" + 4H+

CH2O + HOH + 3(ADP + Pi)

4ATP + 2e" + 2H+

H2 + 4(ADP + Pi)

12ATP + N2 + 6e" + 6H+

2NH3 + 12(ADP + Pi)

Overall: hv + 6H2S + CO2+ N2

6S0 + CH2O + 2NH3 + H2 + HOH [5]

aComplex including several components of the photosynthetic system and the respiratory chain. (Reproduced from McGill (1996), with permission from SBCS and SLCS.)

aComplex including several components of the photosynthetic system and the respiratory chain. (Reproduced from McGill (1996), with permission from SBCS and SLCS.)

and the photolithotrophs (Eq. [5]) carry out N2 fixation, but it is not restricted to phototrophs. Consequently, both the oxygenic and the anoxygenic forms of photosynthesis are associated with the ability to fix N2 as well as to create reduced C for release to subsequent organisms along the food chain. The amount of N2 fixed per mole of e- generated varies because nitrogenase also coreduces H+ to H2 in varying amounts. Similarly the ATP/2e- ratio varies (Paul and Clark, 1989). The values for number of ATPs produced in Table 9.4 are based on 1 mol of H2 generated per mole of N2 fixed and an ATP/2e- ratio of 4.

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