Science Progress articles from December 2001

Science Progress archives from December 2001

The aperture problem for visual motion and its solution in primate cortex.
December 22, 2001... A primary function of the visual system is to analyze the trajectories of moving objects. This seemingly simple process is complicated by theoretical considerations, which show that measurements of the velocity of a moving object are inevitably...

Direct imaging of single-molecules: From dynamics of a single DNA chain to the study of complex DNA-protein interactions.
December 22, 2001... BENOIT LADOUX (1) JEAN-PIERRE QUIVY (2) PATRICK S. DOYLE (3) GENEVIEVE ALMOUZNI (2) JEAN-LOUIS VIOVY (1) Recent years have seen significant advances in the characterization and manipulation of individual molecules. The...

Three-dimensional reconstruction of single particle electron microscopy: The voltage sensitive sodium channel structure.
December 22, 2001... YUTAKA UENO (1) CHIKARA SATO (2) Single particle analysis in electron microscopy allows direct observation of the reconstructed three-dimensional structures of protein molecules. This method enables a more comprehensive study of...

Hydrogenation properties of supported nanosized gold particles.
December 22, 2001... Introduction In the last few years, there has been growing interest in "nanosized" structures in the range 1 to about 20 nanometers in many different fields of research. This is also the size of metal particles usually used in heterogenous...

Oceanic slab melting and mantle metasomatism.
December 22, 2001... BRUNO SCAILLET (1) GAELLE PROUTEAU (2) Modern plate tectonic brings down oceanic crust along subduction zones where it either dehydrates or melts. Those hydrous fluids or melts migrate into the overlying mantle wedge trigerring its...