Abstract:
An agglutination assay method for quantitatively determination of an analyte in an aqueous liquid sample using particles bearing an anti-analyte. The agglutination is conducted in the porous medium layer of the analysis element. A speedy quantitative analysis of the analyte can be conveniently attained with high sensitivity. When the particle-labeled anti-analyte is contained in the porous medium layer, the anti-analyte can be stored with higher stability in the dry state. A dry analysis element for enabling such analysis method is also provided.
Abstract:
An improved homogeneous enzyme immunoassay process for quantitatively analyzing an antigen by determining the change in the enzymatic activity caused by a reaction between the antigen and an enzyme-labeled antibody. The antigen is reacted with an enzyme-labeled antibody, followed by the reaction with a second antibody capable of recognizing and binding to a different epitope and then with a third antibody capable of recognizing and binding to the second antibody. The enzymatic activity of the labeling enzyme is determined by a water-insoluble substrate. Using the water-insoluble substrate, steric hindrance is enhanced. A highly-sensitive analysis can be carried out by a simple operation even when the antigen has a molecular weight falling within an intermediate range, for example, a range of M.W. 10,000 to 70,000.
Abstract:
The blood filter cartridge of the invention can be used as a sample cup of an analyzer without sucking bubbles, which comprises a blood filtering material, a holder containing the blood filtering material and having a blood inlet and a filtrate outlet, and a filtrate receiver for receiving filtrate discharged from the filtrate outlet, the filtrate receiver has an upper end having a difference in height or structure for returning the filtrate from the upper end of the filtrate receiver to the filtrate outlet.
Abstract:
In a device for measuring ion activity in a liquid sample such as a body fluid comprising at least one pair of ion-selective electrodes selectively responsive to a specific ion, a porous liquid distributing member for feeding a liquid sample to one electrode of the pair of electrodes, a porous liquid distributing member for feeding a reference liquid to another electrode of the pair of electrodes and a porous bridge for electrically connecting both liquids to each other, the improvement wherein the liquid distributing members are made of a nonwoven fabric composed of cellulosic long fibers.
Abstract:
A duplex pipette comprises a housing, a pair of cylinders separately formed in the housing to extend substantially in parallel to each other, first and second piston members each having a lower end portion slidably received in one of the cylinders and a handle portion projecting outside the cylinder, and a pair of pipette tips mounted on the lower end of the housing by way of a connecting member, each of the pipette tips having a passage which communicates one of the cylinders with the outside of the housing. The connecting member is arranged so that the distance between the distal ends of the pipette tips can be changed. One of the piston members is arranged to be movable separately from the other piston member and the other piston member is arranged to be movable only together with said one piston member.
Abstract:
An integral ion selective electrode for the analysis of a potassium ion comprising a support, an electroconductive metal layer such as a silver metal layer, a layer of a water-insoluble salt of said metal such as a silver chloride layer, an electrolyte layer which comprises an electrolyte salt of a potassium ion with the same anion as the anion of the water-insoluble salt, said electrolyte layer being substantially free from a binder, and an ion selective layer, which is characterized in that the electrolyte layer comprises crystalline electrolyte having a mean crystal size of not more than 60 .mu.m. Processes preferably employable for the preparation of the ion selective electrode are also disclosed.
Abstract:
An ion selective monoelectrode complex which is favorably employable to manufacture an ion activity measuring apparatus, has on a common non-electroconductive support sheet, plural ion selective monoelectrodes each of which is composed of an electrode composite consisting of, in order, a silver metal layer, a silver halide layer, an electrolytic material layer, and an ion selective membrane, and an electroconductive terminal which is electrically connected to the silver metal layer and which has an exposed surface, under the condition that the ion selective monoelectrodes are aligned, without electric contact with each other, along an imaginary line bridging the electrode composite and the electroconductive terminal.
Abstract:
An agglutination assay method for quantitatively determination of an analyte in an aqueous liquid sample using particles bearing an anti-analyte. The agglutination is conducted in the porous medium layer of the analysis element. A speedy quantitative analysis of the analyte can be conveniently attained with high sensitivity. When the particle-labeled anti-analyte is contained in the porous medium layer, the anti-analyte can be stored with higher stability in the dry state. A dry analysis element for enabling such analysis method is also provided.
Abstract:
A process for blocking a device for detection of biochemically active molecules is performed by the steps of: bringing in the presence of an aqueous medium a detection device having probe molecules, ionic reactive groups, and non-ionic reactive groups on its surface, into contact with compounds which react with the non-ionic reactive groups to produce covalent bondings and compounds which form electrostatic bondings with the ionic reactive groups, simultaneously or separately; and washing the surface of the detection device with an aqueous solvent or a water-miscible solvent.
Abstract:
A DNA chip or its analogue composed of nucleotide derivatives attached to a solid carrier is prepared by method of bringing nucleotide derivatives having a reactive group at each one terminal into contact with a solid carrier having thereon reactive groups in an aqueous phase in the presence of a transferase which is capable of producing a covalent bond by rearrangement of the reactive group of the nucleotide derivative and the reactive group of the solid carrier.