Abstract: An apparatus for performing immunoassays employs a microtiter tray having wells coated with a specific binding partner in conjunction with an array of magnets disposed below the tray. A device for providing relative circular motion of the tray and magnetic array so as to provide a magnet field to the well walls for attracting magnetic particles and subsequent movement of the magnetic field.

Abstract: The present invention relates to a process for determining or detecting by immuno adherence a biological substance present in a sample, which consists in introducing the sample into a receptacle on whose walls there is a component which has a specific immunological affinity for the substance to be tested for, in adding magnetic particles on which there is a substance which has a specific immunological affinity for the substance to be tested for, in subjecting them to several successive magnetic actions in order to accelerate the deposition of the said particles onto the walls and to displace those which have not formed specific bonds with the substance to be tested for which adheres to the walls via the component with affinity which is fixed thereto, and in observing the particles deposited.

Abstract: A device for centrifuging liquid, inter alia for collecting particles or cells in suspension in the liquid. It comprises a vessel for the liquid to be centrifuged made of a material, for example PVC, such that the liquid sample is held inside it by electrostatic forces of attraction and/or by surface tension forces, even when the vessel is not rotating and its orifice is facing downwards.