Observation of the solid-state photo-CIDNP effect in entire cells of cyanobacteria Synechocystis

Cyanobacteria are widely used as model organism of oxygenic photosynthesis due to being the simplest photosynthetic organisms containing both photosystem I and II (PSI and PSII). Photochemically induced dynamic nuclear polarization (photo-CIDNP) 13C magic-angle spinning (MAS) NMR is a powerful tool in understanding the photosynthesis machinery down to atomic level. Combined with selective isotope enrichment this technique has now opened the door to study primary charge separation in whole living cells. Here, we present the first photo-CIDNP observed in whole cells of the cyanobacterium Synechocystis

Photoinduced deposition of copper on nanocrystalline TiO2 films

Nanocrystalline TiO2 films were prepared on glass supports by the dip coating technique using colloidal solutions consisting of 45 Angstrom particles as a precursor in order to probe the feasibility of exploiting solid state photocatalytic reactions for efficient metal deposition. Photoirradiation of nanocrystalline TiO2 films modified with the terdentate ligand (arginine) that covalently binds to the surface of TiO2 and at the same time chelate metal ions at the surface of TiO2 induced reduction of copper ions to metallic copper. Optical properties of the deposited metallic film as well as the possibility to apply this simple procedure in lithography are discussed.Trends in Advanced Materials and Processes, 3rd Yugoslov-Materials-Research-Society Conference, Sep 20-24, 1999, Herceg Novi, Yugoslavi