Indirect Bio-Photolysis
Indirect Bio-photolysis occurs in two stages. To put it simply:
Stage 1: the electrons go to the ferredoxin then to the cell material as opposed to going straight through the cell material.
Stage 2: Fermentation takes place which produces two electrons when then go through hydrogenase to become H2.
Stage 1: the electrons go to the ferredoxin then to the cell material as opposed to going straight through the cell material.
Stage 2: Fermentation takes place which produces two electrons when then go through hydrogenase to become H2.
Direct Bio-Photolysis
Direct bio-photolysis uses photo-system I and II (PSI & PSII) to convert light energy into chemical energy. To start off, PSI and PSII absorb light energy and water. The light absorbed by PSI excites the electrons making them move through a cyclic cycle that produces ATP. The light energy absorbed by PSII produces electrons which then move over to the ferredoxin using the energy cultivated from PSI. The electrons get taken by hydrogenase from the ferredoxin which then are used to produce H2.