Records of actual aircraft arrival times, departure times, and gate occupancies at Honolulu International Airport are analyzed to determine what factors influence gate requirements. Aircraft movements were decomposed into scheduled and nonscheduled operations. The former were compared with the scheduled arrival and departure times as given in the International Airline Guide. An analysis of data for three Saturdays over the 24-hour day showed that actual gate requirements correspond closely to scheduled requirements. The average variance to mean ratio for number of gates occupied at corresponding times on the three days was about 0.14 (if arrivals and departures were completely random, this would have a value of 1). A similar analysis for number of gates occupied by nonscheduled aircraft agreed very well with a Poisson distribution.
A new procedure for quantitating endothelial receptor sites is described. The mean transit time of the passage of an appropriate radio-labeled ligand from the artery to vein of an organ is compared to the mean transit times of a vascular indicator and a water label. The concentration of the unlabeled ligand is progressively increased to define that concentration at which half of the enzyme sites are occupied. Values are calculated for the number of receptor sites accessible during a single circulation in each ml of exchangeable tissue water. This approach is illustrated by estimating the sites of carbonic anhydrase present on the pulmonary endothelium, utilizing labeled acetazolamide as a ligand. Preliminary studies of the receptor sites on isolated endothelial cells suspended in an elutriator are also presented.
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