Figure 4

Characterization of lytic cyanobacterial cells under different stress treatments. Synechocystis/pKT230 (pKT230) and Synechocystis/pKTLYS (pKTLYS) were incubated for 64 hours under only red light (black bars) or under simultaneous red and green light (white bars). Cells were then subjected to freeze-thaw, osmotic shock, or Triton X-100 treatments, followed by measurement of the supernatant fluorescence intensity, representing the released phycocyanin.