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Silica precipitates induced by N. angularis polyamines. For precipitation, polyamines of molecular masses from 1,000 to 1,250 (A) and 600 to 750 Da (B) were used. (C–F) The natural mixture of polyamines (molecular masses 600–1,250 Da) was used for investigating the pH dependence on polyamine-induced silica precipitation. (C) pH 5.4. (D) pH 6.3. (E) pH 7.2. (F) pH 8.3. The polyamine concentration in each solution was 0.85 mg/ml. [Scale bars, 1 μm (A and B) and 500 nm (C–F).]
