An assay apparatus employing total internal reflection of excitation radiation at the interface between a replaceable optically conductive rod or fiber and a surrounding liquid phase of lower index of refraction. Immobilized on the surface of the fiber is a component of a complex formed in an immunological-type...http://www.google.de/patents/US4909990?utm_source=gb-gplus-sharePatent US4909990 - Immunoassay apparatus
