Effects of Cellular Metabolism and Viability on Metal Ion Accumulation by Cultured Biomass from a Bloom of the Cyanobacterium Microcystis aeruginosa

Abstract

The sorption of nickel, cadmium, and copper by cultured biomass from a naturally occurring bloom of Microcystis aeruginosa was demonstrated in two systems: cells suspended in culture medium and cells immobilized in alginate. Incubation in the absence of light, in the presence of metabolic inhibitors, and at 4°C did not substantially decrease the copper accumulation by cells in culture medium. Heat-killed, formaldehydetreated, and air-dried biomass samples sorbed nearly as much (or in some cases slightly more) copper as did viable samples.

Sequestration and Distribution Characteristics of Cd(II) byMicrocystis aeruginosaand Its Role in Colony Formation

“…We suggest that when 0.2 mg L −1 Cd(II) was added, Cd(II) sequestration by M. aeruginosa cells reached its saturation level. Considering the sequestration Cd(II) in M. aeruginosa , >80% was bioadsorbed by bEPS and <20% was bioaccumulated inside algal cell (Figures 5 and 6 ), which is consistent with the results of Parker et al [ 25 ] and Ozturk et al [ 8 ].…”

Cyanobacterial Exopolysaccharides: Their Nature and Potential Biotechnological Applications

“…Copper sorption by M. aeruginosa is largely independent of its metabolic state. Furthermore, heat-killed, HCHO-treated, and airdried M. aeruginosa exhibits substantial sorption of copper, cadmium, and nickel (Parker et al, 1998). Sorption of metals by M. aeruginosa is pH dependent.…”

Relative Effects of Varying Light Conditions on the Growth of Toxic and Non-Toxic Strains of &lt;i&gt;Microcystis aeruginosa&lt;/i&gt;

“…Studies performed in a hypereutrophic lake show that the intensity of light in the water column could be the greatest determining factor regulating the growth and variation of M. aeruginosa. In another study, it was revealed that, M. aeruginosa species has the capacity to survive high light intensity and then regarded to be more tolerant at higher light concentrations [20]. Although high-light intensities could be harmful to cyanobacteria species, the responses and relationships of their relative growth, pigmentation, and cell concentration still need to be appropriately look into.…”