Nitrogen Fixation

After C fixation through photosynthesis, N2 fixation is the second fundamental reaction needed to introduce essential elements from the atmosphere to the pedos-phere (Table 9.4). Representatives of both the photoaquatrophs (Eq. [4] in Table 9.4)

TABLE 9.4 Dinitrogen Fixation Accompanying Anoxygenic and Oxygenic Photosynthesis

Oxygenic photosynthesis and N2 fixation, e.g., Nostoc hu + 6HOH + 19(ADP + Pj) 3ATP + CO2 + 4e~ + 4H+ 12ATP + N2 + 6e" + 6H+ 4ATP + 2e" + 2H+ Overall: hu + 5HOH + CO2 + N2

3O2 + 12e" + 12H + 19ATP CH2O + HOH + 3(ADP + Pi) 2NH3 + 12(ADP + Pi) H2 + 4(ADP + Pi) 3O2 + CH2O + 2NH3 + H2

Anoxygenic photosynthesis and N2 fixation, e.g., Chromatium (purple S bacteria)
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Worm Farming

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