Table of Contents

Part 1 Behaviour: co-variance of daylight, sport participation, and sleep patterns. Part 2 Gastro-intestinal rhythms and nutrition: circadian periodicity of the time of onset of acute lower gastro-intestinal bleeding. Part 3 Cellular and molecular mechanisms: are tidal rhythms ultradian, circadian or infradian?. Part 4 Chronobiology in the work place and in sports: can athletic performance be statistically predicted?; a follow-up study; instrumentation and methods; day-night variation of normal number of computed tomography at several areas in the human brain; computation and quantification; bounded limits and statistical inference in chronobiometry; epidemiology-population chronobiology; diurnal variations of cardiac output in healthy young people; agriculture and general biology; different best-fit multiples in lengths of incubation for altricial and precocial birds; biological timing and implications for agriculture - symposium; chronobiology and agro-ecosystems.