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G. NAGENDRA BABU* AND S.D.S. MURTHY
Department of Biochemistry, Krishna Teja College, Tirupati. Andhra Pradesh. India
In the present study, the chromium and silver ions have been used to identify the alterations in PBPs and analyzed their effect on the energy transfer process of PS II in the above cyanobacterium. By choosing the heavy metals Cr and Ag, attempts were made by incubating the cells and isolated pigment proteins for 24 and 72 h in light with different concentration revealed that the treatment of Cr showed a concentration dependent effect on whole chain electron transport activity and 49 per cent inhibition was noticed with 50 μM of Cr. Similarly Ag is able to cause 51 per cent inhibition with 10 μM concentration. Also, the exploitation of cyanobacteria as spectral probes, related to the Hill activity by exposing the cells to different illumination intensity of white light (105 to 300 μmoles) using neutral density filters suggest that the reason for the inhibition of PS II activity at low light intensity (105 μmoles) could be alterations at the light harvesting complex.