▪ Development of methods of synthesis of stable biocompatible nanoparticles of noble metals for further use as sensors, antimicrobial and anticancer drugs. ▪ Sol-gel synthesis, photocatalytic and physical-chemistry properties of nanosize TiO2, TiO2/ZrO2, TiO2/ZrO2/SiO2 and its modified with nanoparticles of noble metals active in ecological photocatalysis