Abstract: The present invention provides methods, devices, and systems for performing receptor binding assays. In particular, magnetically responsive particles configured to form a complex with a labeled conjugate corresponding to one or more analytes of interest can be moved within an assay device to one or more discrete detection regions through the application of one or more magnetic fields. By positioning the detection region such that the direction of this movement is, for at least a portion of the movement, counter to the direction of fluid flow within the device, detection of assay signals can be performed without the need for separate wash steps. Moreover, contamination of the signals resulting from labeled conjugate being carried in the direction of fluid flow substantially reduced.

Abstract: A tie rack includes a mounting plate, a first side arm extending from the mounting plate, second side arm in a spaced apart, parallel relationship to the first side arm. A first mounting rod extends from the first side arm toward the second side arm, and a second mounting rod extends from the second side arm toward the first side arm. The second mounting rod has a distal end in a spaced apart relationship with the distal end of the first mounting rod. A drag rod extends between the first side arm and the second side arm in a spaced apart and parallel relationship to the first mounting rod and the second mounting rod such that when a tie is looped over one of the mounting rods with two portions of the tie extending therefrom, the two portions are extendable over one side of the drag rod.

Abstract: A tie rack is provided that includes a mounting plate, a first side arm extending from the mounting plate, second side arm in a spaced apart, parallel relationship to the first side arm. A first mounting rod extends from the first side arm toward the second side arm, and a second mounting rod extends from the second side arm toward the first side arm. The second mounting rod has a distal end in a spaced apart relationship with the distal end of the first mounting rod. A drag rod extends between the first side arm and the second side arm in a spaced apart and parallel relationship to the first mounting rod and the second mounting rod such that when a tie is looped over one of mounting rods with two portions of the tie extending therefrom, the two portions are extendable over one side of the drag rod.