2. Electrons are transferred through a series- of carriers to 2 r its reduction on the nitrogenase complex Eight electrons are believed to be needed for each round of fixation reaction: with six for reducing one n2 and two for reducing 2 H** (to form H2) The electrons mainly come from reduced ferredoxin(from photophosphorylation) or reduced flavodoxin(from oxidative ph hosphorylation) and are transferred to dinitrogenase via dinitrogenase reductase2. Electrons are transferred through a series of carriers to N2 for its reduction on the nitrogenase complex • Eight electrons are believed to be needed for each round of fixation reaction: with six for reducing one N2 and two for reducing 2 H+ (to form H2 ). • The electrons mainly come from reduced ferredoxin (from photophosphorylation) or reduced flavodoxin (from oxidative phosphorylation) and are transferred to dinitrogenase via dinitrogenase reductase