 The first step in the infectious cycle is for the cyanophage to make contact and bind to the cyanobacteria, this adsorption process is heavily dependent on light intensity.Field studies also show that the infection and replication of cyanophages is directly or indirectly synchronized with the light-dark cycle.Cyanophages like other bacteriophages rely on Brownian motion to collide with bacteria, and then use receptor binding proteins to recognize cell surface proteins, which leads to adherence.