Abstract: This invention encompasses a work station for conducting assays which comprises filtering assembly, a slide reading assembly, and a slide with a porous filter membrane wherein the slide has a means for aligning the slide within the filter assembly to filter reagents on predetermined portions of the porous filter membrane and also to position the slide in the slide reading assembly so that detection will occur in those same predetermined locations.

Abstract: This invention encompasses a slide reading assembly, and a slide with a porous filter membrane wherein the slide has a means for aligning the slide within a filter assembly to filter reagents on predetermined portions of the porous filter membrane and also to position the slide in a slide reading assembly so that detection will occur in those same predetermined locations.

Abstract: A bottle closure for sealingly closing a bottle while providing access to the interior of the bottle, the bottle being of the type having a neck with external threads thereon, and a mouth at the top of the neck. The bottle closure including a generally cylindric stopper having a radially outwardly projecting flange, a radially inwardly tapering lip projecting axially outwardly from one end of the stopper for insertion into the bottle through the mouth for sealing the bottle and at least one passageway extending through the stopper. The stopper has ears which are axially spaced from the flange. The flange and ears retain a cap on the stopper but allow the cap to rotate with respect to the stopper so that the cap may be tightened on and loosened from the threads of the bottle without unsealing the stopper from the bottle.