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	== Function ==		== Function ==
	The ferrous form of Lb has a very high affinity for oxygen. Nitrogenase is the enzyme responsible for nitrogen fixation, however it is inactivated by oxygen. Bacteroids need oxygen for energy in order to reduce nitrogen to ammonia. This process is known as '''facilitated diffusion'''.		The ferrous form of Lb has a very high affinity for oxygen. Nitrogenase is the enzyme responsible for nitrogen fixation, however it is inactivated by oxygen. Bacteroids need oxygen for energy in order to reduce nitrogen to ammonia. This process is known as '''facilitated diffusion'''. The amount of oxygenated Lb present in the nodules can be estimated using spectroscopy. <ref>Deoxygenated ferrous Lb has an absorption maxima at 427 and 555 nm. In comparison, oxygenated ferrous Lb has an absorption maxima at 411, 541 and 575 nm. Ferric Lb exhibits a characteristic peak at 625 nm.</ref>