4C0A+ (三)生物固氮 4 pyruvate 4 accCoA Be 8 Ferredoxin or 8 Ferredoxin or 8 flavodoxin 8 flavodoxin (oxidized) (reduced) 8 Dinitrogenase 8 Dinitrogenase reductase reductase (reduced) (oxidized) 16 ATP 16ADP +16P图 8 Dinitrogenase 8 Dinitrogenase reductase (reduced) reductase (oxidized +16ATP +16ATP 红色为固氮菌类菌体，蓝色为类菌 体周膜，黄色和绿色为被感染细胞 Dinitrogenase Dinitrogenase (oxidized) (reduced) 的细胞核。 8e 2NH H2 2H+（三） 生物固氮 红色为固氮菌类菌体，蓝色为类菌 体周膜，黄色和绿色为被感染细胞 的细胞核