Hormones and most drugs initiate their biological actions by interacting with receptor macromolecules in or on cells. Of the receptors which are located in the plasma membranes of cells, many are coupled to specific effector molecules via intermediary coupling proteins. These are termed “G”-proteins, because they bind and hydrolyze the guanine nucleotide, GTP (1). Among the biological agents wh...

Performance anxiety consists qf several symptoms experienced in the context qf public performance and is classified in DSM-III-R under social phobia. Performance anxiety must be distinguished from panic disorder, generalized social phobia, and generalized anxiety disorder. Petformance anxiety symptoms can be detrimental to both petformer and performance. These symptoms can be controlled by the ...

The immediate effects of topical salbutamol, a beta 2 adrenergic agonist, on the aqueous humour dynamics of 22 normal subjects was studied by fluorophotometry and tonography. Significant lowering of intraocular pressure was accompanied by a significant increase in both aqueous flow rate and tonographic facility of outflow. Uveoscleral outflow was calculated and found to be significantly increas...