An eductor mixing device has a main body or housing of a generally cylindrical shape and an inner tube for one component to be mixed with a liquid is mounted in main body with a vortex chamber formed in an annulus between the main body and the inlet flow tube. To simplify retrieval of the information, the selection means is operable to present to the user a sequence of sources of information for reproduction including the memory means as well as the broadcast sources, whereby selection of recorded information is as simple as selection of broadcast information. The cell membranes used in the assay may be from cells expressing an endogenous APP or, preferably, cells expressing a recombinant APP. The liquid form allows the combination to be applied with a standard power sprayer, and permits laying of a continuous barrier or curtain as well as injection spraying into walls of structures. VFN\ue8a0=\u03b1\xd7\uf74d-\u03b2. The pattern layer is disposed on one side of the releasing layer.