Abstract: A pump for pumping fluid includes a tube platen, a plunger, a bias member, inlet and outlet valves, an actuator mechanism, a position sensor, and a processor. The plunger is configured for actuation toward and away from the infusion-tube when the tube platen is disposed opposite to the plunger. The tube platen can hold an intravenous infusion tube. The bias member is configured to urge the plunger toward the tube platen.

Abstract: Gas containing granules of a resiliently compressible material having a density variable with pressure are used as a solid phase support in liquid phase reactions such in immunological reactions. Varying pressure causes the density of the granules to change and is used for mixing and separating the granules in liquid phase. In an immunological reaction, the granules having an attached antibody are combined with a solution containing an antigen, then varying pressure is applied to the solution to mix the granules in the solution to fix the antigen to the antibody and then pressure on the solution is varied to force the granules to the top or bottom of the solution whereby the solution can be separated from the granules.

Abstract: A mould for the casting of thin, cross-linked, polymerized resin films is subjected, when being filled with the liquid to be polymerized, to a centrifugal force field exceeding that of the earth gravitation field, the whole being for equalizing the intimate structure of the polymer and to expel therefrom the bubbles of gas possibly present therein. After curing the gel, a mixture of compounds to be separated by the application of an electric field is introduced into the gel and the latter is subjected to electrophoresis within the mould itself.

Abstract: An apparatus responsive to optical changes in a waveguide when the latter is contacted with an analyte capable of reacting with a specific reactant thereto attached to the surface of said guide involves, for containing the analyte, an interchangeable round bottomed cuvette temporarily held by a suitably shaped carrier in working relationship with the optical components of the apparatus, this arrangement ensuring a correct optical orientation thereof relative to said component whatever the exact positioning of the cuvette.

Abstract: A mould for the moulding by casting of thin, cross-linked, polymerized resin films is used which is subjected, when being filled with the liquid to be polymerized, to a centrifugal force field exceeding that of the earth gravitation field, the whole being for equalizing the intimate structure of the polymer and to expel therefrom the bubbles of gas possibly present therein.

Abstract: An analyte in solution is made to react with a spectific reactant coated on the wave-guide thus modifying the optical properties thereof. The index of refraction of the wave-guide material is higher than that of the reaction medium which ensures that a light signal injected into said guide be carried by multiple total reflection, the distance of penetration of the evanescent wave associated with the totally reflected signal being of the same order of magnitude or greater than the thickness of the analyte-reactant product layer.

Abstract: An analyte in solution is made to react with a specific reactant coated on the wave-guide thus modifying the optical properties thereof. The index of refraction of the wave-guide material is higher than that of the reaction medium which ensures that a light signal injected into said guide be carried by multiple total reflection, the distance of penetration of the evanescent wave associated with the totally reflected signal being of the same order of magnitude or greater than the thickness of the analyte-reactant product layer.