Adaptation Reserves of Soil Biofilms with the Dominance of Cyanobacteria of the Genus
Phormidium
A. I. FOKINA1, E. A. GORNOSTAEVA2, S. YU. OGORODNIKOVA1,3, YU. N. ZYKOVA2, L. I. DOMRACHEVA2,3, L. V. KONDAKOVA1,3
1Vyatka State University for the Humanities, 610002, Kirov, Krasnoarmeyskaya str., 26
2Vyatka State Academy of Agriculture, 610017, Kirov, Oktyabrskiy ave., 133
3Komi Science Centre, Institute of Biology, UB RAS, 167982, Syktyvkar, Kommunisticheskaya str., 28
Keywords: cyanobacteria, biofilms, adaptation, biosorption, biotesting, potential
Abstract
The effect produced by copper ions on physiological and biochemical parameters of natural biofilms was studied. Biofilms are multispecific formations of phototrophic microorganisms with the dominance of the Phormidium cyanobacteria. It was established that the impact of Cu2+ ions (20 mg/dm3) after 1 hour caused a decrease of chlorophyll in the biofilms. It also resulted in the appearance of pheophytin in the cyanobacterial suspension, and an increase of lipid peroxidation. In 24 hours the microorganisms got adapted, which was testified by the increased catalase activity, reduced liрid peroxidation, and restoration of chlorophyll. During a 1-hour contact of homogenized biofilm with copper solution (the ratio of 0,031 g. per 100 cm3 of the solution), copper ion (II) concentration reduced to the level of MPC. The purification rate constituted 99 %. This feature of biofilms could be used for creating a biosorbent.
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