This work aims to define and reassess the role of population genetics in conservation biology and seeks to identify the progress made in the field during the last decade. It deals with conservation genetics from several currently researched points of view, such as: ecological and demographic measures of rarity or population persistence; loss of genetic variation; inbreeding; reduced migration rates and increased selective pressures under stress; and the role of social behaviour and metapopulation structure. The use of molecular variation as the basis of naming or selecting target taxa and...

The first of the annual Operator Theory conferences in Ti- mi oara held four years ago was a meeting of operator theory spe- cialists from the National Institute for Scientific and Techni- cal Creation in Bucharest and from the University of Timi oara. Since then, the participation to these conferences has greatly increased, by being attended first by operator theorists from allover the country and (since 1978) by an increasing number of foreign mathematicians. Thus the 1980 Conference can be regarded as a truly international Operator Theory meeting, fifteen coun- tries being represented at...

This volume consists of six articles, each treating an important topic in the theory ofthe Navier-Stokes equations, at the research level. Some of the articles are mainly expository, putting together, in a unified setting, the results of recent research papers and conference lectures. Several other articles are devoted mainly to new results, but present them within a wider context and with a fuller exposition than is usual for journals. The plan to publish these articles as a book began with the lecture notes for the short courses of G.P. Galdi and R. Rannacher, given at the beginning of the...