Professor Rolf Sattler is a distinguished plant morphologist, internationally recognized for his studies in floral development, his critical analyses of the methods and conclusions of comparative morphology and his interpretations of the relationship between developmental processes and evolutionary changes. In addition to numerous papers he has published a volume of original research which is a major contribution to the field of floral morphogenesis. He has lectured by invitation in numerous universities around the world and has participated in several symposia. In 1974 he was awarded the Lawson Medal by the Canadian Botanical Association.

Dr. Savile is author or co-author of over 70 research papers in cytology and taxonomy of fungi; taxonomy and biogeography of phanerogams; floristics especially of the Arctic; ornithology; meteorology; microscopic techniques; and principles and processes of evolution. He is Curator of the National Mycological Herbarium and has specialized on rusts and smuts in which he is a recognized authority. He has used his knowledge of the parasitic fungi to elucidate the phylogeny of certain of the host plants. He has carried out extensive biological explorations in the Canadian Arctic. He has made significant contributions in the field of aerodynamics of avian and mammalian flight. He has shown notable ability in the integration and application of data from various disciplines to problems of evolution.

Dr. J. C. Scaiano is distinguished nationally and internationally for his work on organic reaction intermediates. His outstanding contributions in the fields of excited states, biradicals, free-radicals, radical-pairs, and carbenes have produced a revolution in our understanding of their reactions. His development and application of laser techniques for the study of rapid organic reactions have led to fast and accurate methods for the study of reaction mechanisms and kinetics. His stimulating research on the role of highly reactive intermediates in homogeneous systems, polymers, and molecular aggregates has made him one of Canada's most highly respected and prolific young scientists.

H.I. SCHIFF (Chemistry), over a period of some twenty-five years, has made a very significant impact on physical chemistry and has achieved an undoubted international reputation. He has made lasting and important contributions to the measurements of the rates of a considerable number of chemical reactions involving both neutral and charged species, as well as to the determination of bond dissociation energies, of ion appearance potentials, of conductivities, and of diffusion constants. His contributions to the development of techniques to measure trace constituents of the upper atmosphere and to the interpretation of the physics and chemistry of the stratosphere are particularly important from the point of view of the pollution of the stratosphere by supersonic aircraft with potentially serious adverse effects.

DAVID W. SCHINDLER founded the Experimental Lakes Project of the Canadian Department of Fisheries and Oceans in 1968. After directing the project for 22 years, he moved to the University of Alberta, where he has been the Killam Memorial Professor of Ecology since 1989. He has received numerous awards for his scientific work, including the first Frank Rigler Award of the Canadian Society of Limnologists, the Hutchinson Medal of the American Society of Limnology and Oceanography, the Naumann-Thienemann Medal of the International Limnological Society, the first Miroslaw Romanowski Medal of the royal Society of Canada, the Manning Award of Distinction for Innovation in Science, the first Stockholm Water Prize, the Volvo Environment Award, and the Gordin Kaplan Award. He has served as the president of the American Society of Limnology and Oceanography. He has received four honorary doctorate degrees from Canadian and American Universities, and was inducted into the Royal Society of Canada in 1983. He has published over 225 papers on a wide variety of topics in aquatic ecology and biogeochemistry, including eutrophication, acid rain, climate warming, and lake restoration.

H.P. Schwarcz has made numerous and brilliant contributions to geochemistry, quaternary geology and archaeology. Oxygen, sulphur and carbon isotope ratios have been used to interpret the history of metamorphic rocks, sulphide ores and, more recently, cave deposits. The innovative analysis of speleotherm growth rings to measure past climatic temperature, when caves were forming, led him to search for a way to measure their age. This was achieved in the establishment of the first Canadian uranium-series dating laboratory, leading to a series of articles with students and collaborators (notably D.C. Ford) recording climate changes back through the Pleistocene. These successes led in turn to his current collaborations with archaeologists, measuring critical deposits and artifacts to establish an absolute time scale for human pre-history. He has a wide diversity of interests and brings a fertile creative mind and a warm human enthusiasm to all his activities.

Dr. Scriver's basic work concerned the expression of genes in the transport of amino acids across membranes of kidney cells and his concept of "inborn errors of transport'' and studies of gene dependent-abnormal vitamin dependencies. Two inborn errors of transport were discovered and ten new inherited biochemical diseases and some modes of treatment. He has received international recognition for applying genetic knowledge to the management of hereditary disease. He achieved a change in Quebec legislation so that vitamin-D is added to milk benefitting about 500 infants yearly. He pioneered the unique Quebec Genetics Network which screens virtually every new-born baby for hereditary metabolic diseases bringing treatment where needed. He lectures at McGill University and publishes extensively.

Dr. Seeman has made fundamental contributions to the understanding of drug actions in the brain. His research on "fluidization" of cell membrane lipids provided an explanation of the anaesthetic action of drugs of widely differing chemical structure, and was the basis for a current theory of tolerance to such drugs. In 1974 he devised a method for measuring the numbers and binding properties of dopamine receptors in different parts of the brain. This internationally acclaimed work has led to the identification of different types of dopamine receptors and their roles in the pathophysiology and treatment of schizophrenia, Parkinson's disease and other diseases of the nervous system.

Dr. Nabil Seidah was trained at Georgetown University in physical chemistry before joining the Institute first as as post-doctoral fellow and then as director of the laboratory on biochemical neuroendocrinology. Dr. Seidah is the co-discoverer of human beta-endorphin and has worked on its biosynthesis for four to five years demonstrating in particular the exact sites of cleavage during pulse-chase experiments. For this work, he received the Clarke Institute Award in 1978 (Toronto). He was the first to develop, in collaboration with the late Margaret Dayhoff, (in the mid 1970's) computer programs to identify protein fragments from data of partial sequence at 10-15 M range. Since 1979, he has tackled one of the most crucial and central aspects of brain chemistry which is the characterization of the enzymatic systems for the cleavage of precursors at pairs of basic amino acid residues. Only a few scientists have had the courage and the determination to tackle this complicated problem. He, Donald Steiner, Peng Loh and J. Thorner are the main leaders in the field. Even though the international competition was very high, Dr. Seidah is the first to have identified a new family of enzymes by reverse genetics which has all the properties of the cleavage enzyme. Dr. Seidah is a superb protein biochemist and he has added molecular biology to his wide expertise by spending one year sabbatical at the Pasteur Institute in Paris in 1987. He is now working on the protein aspect of his discovery and he is superbly prepared to bring it to fruition. Dr. Seidah is a chemist who has become an excellent biochemist and a world leader in his field. The new enzymes he discovered, called convertases, are at the crossroads of the new chemistry of the brain i.e. the neuropeptides. The cleavage of their precursors is a universal phenomenon which helps the brain to produce the tens of thousands of molecules it needs to insure his numerous and varied functions.

BARRY JOHN SESSLE, Professor, Faculty of Dentistry and Department of Physiology, Faculty of Medicine, University of Toronto, has provided major insights into neural mechanisms underlying orofacial function and into the aetiology and treatment of several disorders of the face, mouth and jaws related to pain, chewing and swallowing. His extensive and pioneering studies have resulted in remarkable advances in knowledge of the central neural organization of the trigeminal system, specifically of the brainstem mechanisms involved in orofacial nociceptive transmission and its control and neuroplasticity, the brainstem pathways underlying orofacial motor behaviours such as chewing and swallowing, and the organization and role of the sensorimotor cerebral cortex in the initiation and regulation of these motor behaviours.

Lotfollah Shafai, Professor, Department of Electrical and Computer Engineering, University of Manitoba, has contributed significantly in two areas of Applied Electromagnetics and Radiating systems. He has developed a generalized transformation method that relates the geometry and material property of objects to their electromagnetic field. He has pioneered the special decomposition technique that is used widely for computation of large structure scattering. He has also developed numerous efficient computational algorithms for complex problems in corona remote sensing and layer media. In the area of radiating systems he has pioneered the development of high performance and miniaturized reflector antennas, has pioneered wideband conformal sensors and antennas and developed award winning CAD tools for modelling and design of both. He has also contributed significantly to the development of low loss arrays at extremely high frequencies and millimeter waves.