Abstract Ynamides bearing a tethered allyl sulfoxide undergo gold-catalysed cycloisomerisation to afford tetrahydrothiophene-2-carboxamides and their benzo-fused analogues. The reactions are initiated by formal 7-endo-dig cyclisation accommodate range of different substituents. use N-allyl ynamides provided route into novel spirocyclic ε-lactam structures.

Recently, we reported an innovative type of micromotors consisting of nanowires as rotors and patterned Au/Ni/Cr nanodisks as bearings. The dimensions of micromotors were less than 1 μm, and could continuously rotate for 15 hours over 240 000 cycles. To understand the limitation of their lifetime, we systematically investigated the rotation dynamics by analytical modeling and determined the tim...

Conglomerates, trade credit arrangements and banks are all instances of financial intermediation. However, in spite of this fundamental similarity, important differences exist between these institutions. In particular, they differ in the extent to which the projects financed absorb aggregate intermediary risk, in whether or not intermediation is carried out by a financial specialist, in the typ...

OBJECTIVE Nanotechnology has been identified as a promising platform in the improvement of the design and development of drug delivery systems. In the present study we investigated the potential of lipidic nanoparticles consisting of gold porphyrin for the treatment of neuroblastoma. MATERIALS AND METHODS To characterize the size of the lipidic gold porphyrin nanoparticles, we used transmissi...

Statistical and spatial analyses of both historical time series and remotely sensed data show a link between the spatial distribution and growth of gold production across the Guiana Shield in northeast Amazonia. Results indicate that an exponential rise in production across an expanding area is primarily a delayed response to the 1971-1978 market flotation of international gold prices. The subs...

Gold nanoparticles have particular properties distinct from those of bulk gold crystals, and such nanoparticles are used in various applications in optics, catalysis, and drug delivery. Many reports on microbial synthesis of gold nanoparticles have appeared. However, the molecular details (reduction and dispersion) of such synthesis remain unclear. In the present study, we studied gold nanopart...