RESUMEN
Halide-permeable xerogel films prepared from sols containing 50 mol% aminopropyltriethoxysilane (APTES)/50 mol% tetraethoxysilane (TEOS) or 10 mol% APTES/90 mol% TEOS and 0.015 M selenoxide or telluride catalyst in the sol gave reduced settlement of cypris larvae of the barnacle Balanus amphitrite and larvae of the tubeworm Hydroides elegans in the presence of artificial seawater (ASW) and hydrogen peroxide (5-100 microM) relative to glass controls. Settlement of Ulva zoospores was lower on both the 50 mol% APTES/50 mol% TEOS and 10 mol% APTES/90 mol% TEOS xerogel formulations in comparison with glass controls with or without the added catalyst. The 50 mol% APTES/50 mol%TEOS xerogel containing telluride catalyst gave reduced settlement of Ulva zoospores in the presence of 100 microM H(2)O(2) in ASW compared with the same coating without added peroxide. Scanning electron microscopy and XPS data suggest that exposure to H(2)O(2) does not lead to chemical or morphological changes on the xerogel surface.
Asunto(s)
Peróxido de Hidrógeno/metabolismo , Poliquetos/efectos de los fármacos , Silanos/farmacología , Thoracica/efectos de los fármacos , Ulva/efectos de los fármacos , Animales , Catálisis , Geles/química , Geles/farmacología , Vidrio , Peróxido de Hidrógeno/farmacología , Biología Marina , Poliquetos/crecimiento & desarrollo , Propilaminas , Propiedades de Superficie , Thoracica/crecimiento & desarrollo , Ulva/crecimiento & desarrolloRESUMEN
A series of substituted quinones was alkylated with diethylcadmium. Regiochemistry of addition shifted from quinol formation to conjugate addition as a function of the steric and electronic effects of the substituents.