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Twenty years ago, researchers wishing to identify contaminated areas in aquatic environments generally took water samples, and analysed them badly (as we have since discovered) for a few "pollutants" which were of topical note at the time (and which could be quantified by the methods then available).

another is fractal geometry, which involves the concept of (non-integer) fractal dimension. This implies the formulation of fractal growth modele based on physical concepts and their theoretical understanding in the same sense as the Renormalization Group method has allowed to understand the critical properties of phase transitions.

Neutrino '80 held at the Ettore Majorana Center for Scientific Culture in Erice, was the tenth of a series of International Confer ences on Neutrino Physics and Astrophysics.

Every year between three and four hundred papers are published on the topic of insulin action. I intend to present a review of the physiological effects of insulin, the pathology of defects in the action of insulin, and the current views on the mechanism of action of this hormone.

The literature on queueing theory is already very large. plus many other books on probability theory or operations research in which queueing theory is discussed. Despite this tremendous activity, queueing theory, as a tool for analysis of practical problems, remains in a primitive state;

Prior to the 1970's a substantial literature had accumulated on the theory of optimal design, particularly of optimal linear regression design.

Chapter 11 dealing with ruin probability during a finite time interval does not give an adequate view of the current importanoe of this topic but the position is fluid because of the considerable effort being expended in the search for practical methods of calcu lation.

As is apparent from the table of contents, the lectures at the Third Course of the International School of Applied Geophysics, Erice, March 27-April 4, 1980 (the first part of this volume) dealt with several applications of inversion to different geophy sical methods.

Ecotoxicology is a relatively new scientific discipline. Ramade (1987) emphasized in their books the broad basis of ecotoxicology, encompassing chemical and radiation effects on all components of ecosystems.

This book originated in the Workshop on "Hadronic Matter at Extreme Energy Density," held at the Ettore Majorana Center in Erice, October 13-21, 1978. It was progress in the knowledge of symmetries in particle physics that fueled the advance toward the present formulation of supergravity, thus help ing to heal this historical separation.

To the classical driving forces of migration such as poverty, oppression and war, yet another is being added: globalization. Many less developed countries (LDCs) accept migration of their workers to developed countries (DCs) because it reduces the pressure on unemployment, and remittances increase the capital inflow to the country.

Every year between three and four hundred papers are published on the topic of insulin action. I intend to present a review of the physiological effects of insulin, the pathology of defects in the action of insulin, and the current views on the mechanism of action of this hormone.

Ecotoxicology is a relatively new scientific discipline. Ramade (1987) emphasized in their books the broad basis of ecotoxicology, encompassing chemical and radiation effects on all components of ecosystems.