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Caffeine is the most widely consumed central-nervous-system stimulant. Three main mechanisms of action of caffeine on the central… Expand Tea is grown in about 30 countries but is consumed worldwide, although at greatly varying levels. It is the most widely consumed… Expand Natural and synthetic methylxanthines inhibit insect feeding and are pesticidal at concentrations known to occur in plants. These… Expand Central stimulant actions of 10 methylxanthines in mice correlate with affinities for adenosine receptors labeled with N6-[3H… Expand Adenosine has a significant role in many functions of the central nervous system. Behaviorally, adenosine and adenosine analogs… Expand Abstract— In cell cultures of glial character derived from perinatal mouse brain adenosine elicits two effects. (a) At… Expand The immunologic release of histamine and slow reacting substance of anaphylaxis (SRS-A) from human lung tissue can be enhanced by… Expand Abstract The actions of certain lipolytic and antilipolytic agents were studied in isolated fat cells at the level of cyclic AMP… Expand Methylxanthines and catecholamines both inhibit antigenically induced histamine release from human leukocytes. They act… Expand The detection and measurement of adenosine 3’) 5’-phosphate are complicated by the extremely low levels present in most… Expand