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nfluence of immobilization in Ca-alginate gel on K+ (86Rb+) uptake by Chlorella vulgaris cells was investigated. In immobilized cells the K+ influx was decreased by 20-25% in comparison to suspended cells. The addition of Ca2+ (0.1-10 mM) into incubation medium considerably increased K+ uptake in suspension. By contrast, free alginate (0.01-1%) drastically inhibited the isotope uptake in the same...