glutathione and caffeine antagonize the spermimmobilizing effect of a vaginal contraceptive the concentrationdependent inhibition of neosampoon a vaginal contraceptive on ejaculated human sperm motility was studied with a transmembrane migration method caffeine 5mm glutathione 5mm and glutathione 15mm all reactivated the motility of neosampoonimmobilized sperm caffeine 5mm was more potent than glutathione in antagonizing neosampoon there was no difference between the potency of 5mm and 15mmglutathione human sperm motility could be a model for studying the interaction of membraneactive drugs including the protective effect of glutathione against membranedisrupting agents gddtpaenhancement magnetic resonance imaging of the cavernous sinus based upon our experiences with 7 cases and a literature review a survey is provided on the possibilities and limitations of preoperative diagnosis of spaceoccupying lesions of the cavernous sinus using mri with gddtpa enhancement advantages are that in many cases arteriography is no longer necessary and that the diagnostic sensitivity is higher as compared with ct the pattern of enhancement does not allow for histological distinction among the various lesions