Abstract: A work station for simultaneously performing multiple assays includes a base structure, a receptacle rack assembly received within a receptacle rack well formed in the base structure, a pipette tip rack assembly received within a pipette tip rack well formed in the base structure, a multiple conduit substance transfer device, and substance transfer device positioning structure. The receptacle rack assembly holds a plurality of receptacles in which a plurality of individual assays are performed, and the pipette tip rack assembly holds a plurality of contamination limiting pipette tips. The substance transfer device is capable of simultaneously dispensing substances into two or more receptacles or simultaneously removing substances from two or more receptacles. Alternatively, the substance transfer device is capable of simultaneously dispensing substances into two or more receptacles, and, at about the same time, simultaneously removing substances from two or more receptacles.

Abstract: A connector useful for combining the contents of a pair of containers which includes a hollow body for passing fluids between the containers. The body includes top and bottom end portions dimensioned to receive open-ended containers in an interference fit. The top end portion includes one or more recesses sized and arranged to facilitate drainage of a fluid from the first container into the second container when the first container is positioned above the second container. A middle portion is positioned between and adjoins the end portions of the body. A system for combining the contents of a pair of containers is formed when containers having substances to be combined are fitted onto the end portions of the connector.