Some of microalgae like blue green algae have glycogen instead
of starch in their cells. This is an exception, which involves oxidation
of ferrodoxin by the hydrogenase enzyme activity for the
production of hydrogen in anaerobic condition. However, another
function of this enzyme is to be involved in the detachment of
electrons. Therefore, different researchers have focused for the
identification of these enzyme activities having interactions with
ferrodoxin and the other metabolic functions for microalgal photobiohydrogen
production. They are also involved with the change
of these interactions genetically to enhance the biohydrogen production