Fig 7. Different behavior of silica structures in the Rho B binding.

a) Fluorescence spectra of 1 μg/ml of Rho B solution after 30 min of incubation at room temperature with 0.1 mg/ml of frustules, DP or SiO₂ and centrifugation; b) % of residual fluorescence at 566 nm of 1 μg/ml Rho B solutions after incubation as described. The values were normalized in respect to the fluorescence of Rho B solution alone. Each bar represents SD of three independent experiments.