It has been widely recognized that the "new physics" results from a high energy collider are related to the detector capabilities, and that future detec tors must solve the problems presented by the new environment. Vertex detectors, in particular, will have to sustain enormous rates, have a great resistance to radiation damage, while retaining good spatial accuracy. Promising technologies are emerging, and gaseous detectors are improving: this workshop was intended as a point of reference towards future detectors, with particular emphasis on experimental results achieved so far. We wish to...

Proceedings of a NATO Advanced Research Workshop, and of a Chaos, Order, and Patterns Panel sponsored workshop on title], held in Lyons, France, July 1991. The refereed papers fall into three general areas: Whitham modulation equations and their exact solutions; asymptotics and limits; and existenc

Our present concepts ofthe regulation of enzyme activity in the cell have been largely based on the extensive body of work which has been carried out with micro-organisms. A distinction between constitutive and adaptive enzymes had already been made well before World War II and work on enzyme adaptation, both in yeast and bacteria, was done by several workers, especially Marjorie Stephenson and her group in Cambridge in the 1930s. In studies starting about 1947 Stanier demonstrated that the oxidation of aromatic compounds by species of Pseudomonas involved the coordinate and sequential...

The 15th Latin American Symposium ''laS held in Brasilia (FD) on J1UY 18-22, 1977, on a topic of great interest for agriculture, especially in the tropics. Many new developments have taken place in the field of research in N2 fixation during the last few years. They "Tere made possible by the improved methods of measuring of nitrogenase activity, progress in genetic engineering fields and the increased interest in taking advantage of natural sources for biological nitrogen fixation. The approach used in this Symposium together with the one held four months earlier in Brookhaven on;'Genetic...

This book is based on the papers presented at the conference on "Mecha- nisms of DNA Damage and Repair: Implications for Carcinogenesis and Risk Assessment," held at the National Bureau of Standards on June 2-7, 1985, This volume deals with mechanisms of DNA damage and repair at the molecular level; consequences of unrepaired or misrepaired damage, with major emphasis on carcinogenesis; drugs which bind selectively to altered and potentially damaging DNA sequences; and potential utilization of DNA damage as an endpoint for assessing risks of UV light, ionizing radiations, chemicals, drugs,...

There is a time in scientific research when a number of developments coincide making it possible to progress with a tough and complicated problem. It is believed that such a time has come in the area of biological nitrogen fixation. A better understanding of photosynthesis, cell hybridization, plasmid, and gene transfer between cells not necessarily genetically related, have opened new avenues of research. New developments in traditional genetics, cell biology, biochemistry, including enzyme chemistry, and plant physi- ology have brought about the feeling this is a most appro- priate time to...

The present volume includes the large majority of papers given at the symposium entitled "Fundamental Approaches to Plant and Animal Improvement," held at Cali, Colombia, in November, 1972. The primary focal points were on various genetic mechanisms, including gene action and mutation, the development of phenotypic attributes, and on evolution, including that controlled by man for agricultural purposes. In fact, very little referring in any particular way to animal improvement was included, while a great deal of attention was paid to higher plants and to microorganisms. On the other hand,...

For the past thirteen years, symposia have been held either in South America or in Mexico on subjects of special interest to Latin American scientists. When the opportunity of holding the 14th International Biological Symposium in Guate- mala was offered, it was most welcome, especially as the occasion was the celebration of the 25th Anniversary of the Institute of Nutrition of Central America and Panama (INCAP). With the encouragement of members of the Ford Foundation staff and the National Academy of Sciences, the idea for a symposium on the broad approach to the problem of nutrition was...

For the last eighteen years we have been deeply involved in a cooperative effort with our Latin American colleagues in genetics, biochemistry, physiology, and molecular biology. We have been in close contact with scientists in a number of centers and have helped to organize symposia, workshops, and so forth, in an effort to accelerate their development and make their substantial work known. These symposia in Latin America have been quite successful. The fifteenth will take place in Brasilia in 1977. At the request of colleagues, we are in the process of developing a similar series in Asia....