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The 8th International Congress of Biorheology was held at the Pacifico Yokohama, Japan, a brand new, versatile convention center for international meetings, from August 3 through 8, 1992. There were many plenary lectures and symposia, one of which was entitled'Mechanics of the Venous System.'It was at this symposium that we, the editors of this monograph, each presented papers. We then moved to Gifu, Japan, for the Gifu Workshop on Veins and Vascular Capacitance. This was held on August 9, 1992, with the Second Department of Medicine, Gifu University School of Medicine, serving as the host. Nine papers were presented in the oral sessions and there were five poster presentations. This monograph, which is intended to provide a bird's­ eye view of recent trends in studies of the venous system, is an outgrowth of the Gifu Workshop. While it is not exactly the Proceedings ofthat workshop, materials in the monograph were developed from ideas presented there.

Research centering on blood flow in the heart continues to hold an important position, especially since a better understanding of the subject may help reduce the incidence of coronary arterial disease and heart attacks. This book summarizes recent advances in the field; it is the product of fruitful cooperation among international scientists who met in Japan in May, 1990 to discuss the regulation of coronary blood flow.

Since the exhaustive Handbook of Physiology (Alimentary Canal, Section 6, Motility) edited by CHARLES F. CODE in 1968, no complete survey of the morphological basis and the physiological control of intestinal motility has been published, in spite of the enormous amount of new data in the literature on this topic. The new techniques and methodologies, the use of electron microscopy, radioimmunoassay and binding techniques, as weIl as ever more sophisticated electrophysiological procedures have made possible areal flood of discoveries in this field. Moreover, the possibility ofnew studies ofthe endocrine cells in biopsies of human intestinal mucosa even during routine endoscopies, has opened new horizons for gastroenterologists and generated a number of important contribu­ tions to our knowledge of the morphology and physiopathology of the gut. As usual, new discoveries have also revealed both ignorance and many new problems. For tbis reason, although many of the data reported in this volume can be considered as firmly established, others still require confirmation, and the results of new research in this field are awaited with extreme interest. Since advances are occurring so rapidly, even experts in the specific topics need frequent comprehensive reviews. To avoid an excessively large volume, considera­ tions ofthe pancreas, liver, and biliary system were not included in this Handbook, which, nevertheless, has attempted to off er the reader the essence of more than 1,500 papers.

In 1970 I gave up the chairmanship of the Department of Pharmacology at Stanford University Schoel of Medicine to devote full time to basic and clinical research on problems of drug addiction. In 1971 I developed the method of radioligand binding that led to the important characterization of opioid receptors in several laboratories. The extraordinary specificity of these receptors for morphine and related opiates suggested the likelihood that there were naturally occurring morphine-like molecules in the brain and other tissues. The systematic search for these molecules culminated in 1979 in the discovery, by my group, ofthe dynorphin peptides-one of the three families of opioid peptides, the first of which (the enkephalin family) had been discovered in Aberdeen, Scotland, in 1975. I also became involved in clinical research on the pharmacologic treatment of heroin addicts, for which I established the first large methadone mainte­ nance treatment program in California. My basic and clinical research experience convinced me that an institution encompassing laboratory research, studies on normal human volunteers, and treatment research, under a single roof, could expedite progress in understanding the drug addictions. That concept was transformed into reality by the founding, in 1974, of the Addiction Research Foundation of Palo Alto, California. The funds for construction of a laboratory were provided by a generous grant from the Drug Abuse Council (a consortium of several foundations), the president of which was Thomas L. Bryant.

during the past few years increasing interest has been focused on the role of gamma-aminobutyric acid (GABA) outside the central nervous systems (CNS).Biochemical, pharmacological, histochemical, physiological approaches have all been employed to investigate the role of GABA in themammalian periphery. The International Symposium on Peripheral GABAergic Mechanism held in Rome, July 1990, was devoted to gather scientists from allover the world in order to summarize and sythesize their most recent results and conceptions on the significance of GABA outside the CNS. Written in a thought-provoking style, this proceedings volume is an overviewof the timely knowledge about GABA in the peripheral nervous system and in non-neuronal tissues. Chapters of the book provide many examples for the diverse functions of this amino acid in the periphery as neurotransmitter, hormone, humoral or even trophic factor from the autonomic ganglia to the endocrine stomach and pancreas, from the tubular epithelium of the kidney to the spermatozoa.