Abstract
The effect of copper ions on physiological and biochemical parameters of naturally occurring biofilms has been studied. Biofilms are multispecies consortia of phototrophic microorganisms dominated by Phormidium spp. We have found that, at 1 h of exposure in the presence of Cu2+ ions (20 mg/dm3), chlorophyll a degraded to give pheophytin accompanied by lipid peroxidation. At 24 h the microorganisms show adaptive response, as is evidenced by the increase in catalase activity, reduced lipid peroxidation, and return of chlorophyll a to normal levels. One hour of exposure of suspended cells (0.031 g/100 cm3 solution) reduces the concentration of copper (II) MPC level, with the purification rate being 99%. This feature of biofilms holds potential for use as biosorbents.
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