| abstract |
Biologically active organic silicon compounds of general formula: in which R1, R2, R3 and R4 are organic radicals of which at least one is hydrolysable, of the type -X-R ', X being a hetero atom and R' being H or an organic radical, said compound being an extract of algal origin mainly from the reproductive organs or young tissue (12). The algae of the Rhodophyceae class are particularly suitable for this extraction. |