Two new Mexican Paleonura are described and illustrated, one from soil and litter at the Biological Station of Chamela, Jalisco, and the other from one cave in Colima State, Mexico.

A theory is proposed to describe two-dimensional avalanches in granular materials. The theoretical framework is based on a set of experiments in which avalanches are generated intermittently by means of a rotating drum. ...

Experimentally it is found that the pressure dependence of T-c, in high-T-c superconductors, is influenced by several factors. The carrier density, the doping, and the contraction of the unit cell are some of these factors. ...

In the structure of the title compound, C10H8BrNS, the dihedral angles between the planes of the thiazole and aryl rings, viz. 4.2 (6) and 7.5 (6)degrees for the two independent molecules, are consistent with insignificant ...