The synergy of biliproteins with antioxidant
capacity of N. lobatus under Fe supplement
appeared interesting and has scientific as well as commercial
significance. Iron plays an important role in the synthesis
of biliproteins (Keren et al., 2004), in photosynthetic
electron transports (Raven et al., 1999) and is a co-factor
of nitrogenase (Zehr et al., 1997). The latter is the key
enzyme of nitrogen fixation and responsible for cellular
N availability for the synthesis of proteins including phycobiliproteins
in diazotrophs. It seems that iron alone can be
used as a supplement to the growth medium for scaling-up