摘要:
A dry multilayer analysis element which allows easy permeation of a high molecular weight component or hydrophobic component, which has, in order, at least a water permeable porous reagent layer, a water permeable light reflecting/screen layer, and a water permeable porous spreading layer on a water-impermeable transparent support, a reagent composition capable of producing an optically detectable substance in the presence of a component to be detected being incorporated in at least one of the water-permeable layers including said reagent layer, said light reflecting/screen layer being porous and comprised microcapsules having a core containing light reflective/screen grains and a shell made of a high molecular weight compound, wherein each of said reagent layer, spreading layer, and reflecting/screen layer allows permeation of a high molecular weight or hydrophobic component therethrough.
摘要:
A multi-layer analytical element for analyzing body fluids includes a light transmitting and water impermeable support having provided thereon a fist non-fibrous porous layer, a second non-fibrous porous layer, and a fibrous porous layer in this order, the three porous layers being bonded together in one piece with an adhesive locally applied in such a manner that small through-holes are formed so as not to substantially interfere with uniform penetration of the liquid. At least one of the non-fibrous porous layers contains a reagent composition which undergoes a detectable optical change in the presence of a component to be analyzed, which optical change is detectable in the first non-fibrous porous layer, and wherein the non-fibrous porous layer comprises polysulfone. The analytical element enables dry analyses with improved precision independently of the hematocrit value of samples.
摘要:
A semiconductor integrated circuit has complementary field-effect transistors, one formed in a semiconductor substrate, the other formed in a well in the substrate, and has four power-supply potentials: two supplied to the sources of the field-effect transistors, one supplied to the substrate, and one supplied to the well. An unwanted pair of parasitic bipolar transistors are formed in association with the field-effect transistors. An intentionally formed bipolar transistor operates in series with one of the unwanted parasitic transistors and as a current mirror for the other unwanted parasitic transistor, limiting the flow of unwanted current through the parasitic bipolar transistors.
摘要:
A protection circuit for a semiconductor device, the protection circuit being connected an input terminal of the semiconductor device in parallel with an internal circuit proper of the semiconductor device, comprising a semiconductor substrate having one conductivity, a first diffusion layer having the other conductivity produced along the top surface of the semiconductor substrate, a second diffusion layer having the other conductivity produced along the top surface of the first diffusion layer, the impurity concentration of the second diffusion layer being larger than that of the first diffusion layer, at least one third diffusion layer having one conductivity produced along the top surface of the semiconductor substrate and the first diffusion layer across the junction of the first diffusion layer, the impurity concentration being larger than that of the semiconductor substrate, an insulator film produced to cover a portion of the second and third diffusion layers and the first diffusion layer, a pair of insulator films produced to cover a portion of the remaining area of the third diffusion layers, an electrode arranged to contact the second diffusion layer and to cover the insulator layer covering the first diffusion layer, and the electrode being connected the input terminal and the internal circuit proper of the semiconductor device, whereby the protection circuit allows positive surge voltages to escape, and becomes durable against negative surge voltages.
摘要:
The present invention provides a charge-pump boosting circuit. In a charging period of a capacitor C1, a PMOS transistor Q1 and an NMOS transistor Q2 turn on, and the capacitor C1 is charged by voltage between a potential VCC and a potential VSS. On the other hand, in a discharging period of a boosting capacitor, a PMOS transistor Q3 and a PMOS transistor Q4 turn on, and charges accumulated in the boosting capacitor are discharged. In a discharging period of the capacitor C1, a selector SEL1 selects a terminal T1, and a feedback system, in which operation voltage applied to a gate of the PMOS transistor Q3 changes in accordance with fluctuations in output potential VDD2, is formed. At this time, only a resistance component of the PMOS transistor Q3 exists and no differential amplifier is provided, on a path of current flowing-into the capacitor C1 (between the potential VCC and a low voltage side terminal C1N of the boosting capacitor).
摘要:
A power-on reset circuit includes a capacitor, an inverter, a resistor and first and second transistors which are connected in series between a power supply line and ground. The electric current flowing through the resistor flow through the first and second transistors with a certain time delay because of an electric charge stored in the capacitor. A rising of a power supply voltage is applied to the inverter with a certain time delay when the power supply voltage goes up. According to the power-on reset circuit, a reset pulse can be generated regardless a speed of rising of the power supply voltage.
摘要:
An analysis film comprises a reagent layer composed of a porous material which contains an antibody but does not substantially contain a complex of an analyte or a labelled antigen with the antibody. In the analysis film, reagents for enzyme immune reaction of homogenous type are incorporated so that an analyte is analyzed without requiring B/F separation. An analysis method for various analytes using the same provides high sensitivity, high accuracy as well as good reproducibility and is simple and rapid.
摘要:
In a method of assay for a trace component such as antigen, antibody or enzyme utilizing immunochemical reaction or enzyme reaction in combination with photographic detection system comprising measuring optical density of a silver image formed in proportion to the antigen, antibody or enzyme to be measured, a novel analysis sheet comprising a support having provided thereon, in succession, a water absorbing layer and a silver halide emulsion layer is employed. The analysis sheet essentially increases the amount of water absorbed so that the analysis sheet is extremely effective for improving detection sensitivity.
摘要:
A photographic light-sensitive material comprising at least one layer containing a polymer dispersion of the following formula (I) or (II) as a mordant ##STR1## wherein A represents a monomer unit obtained from at least one monomer having at least two copolymerizable ethylenically unsaturated groups at least one of which is in the side chain; B represents a monomer unit obtained from at least one copolymerizable monoethylenically unsaturated monomer; D.sup..sym. represents a 5- or 6-membered heterocyclic group containing one or two nitrogen atoms one of which is positively charged and D may contain one or more substituents; R.sub.1 represents a hydrogen atom or a lower alkyl group; R.sub.2 and R.sub.3, which may be the same or different, each represents an alkyl group or an aralkyl group, or R.sub.2 and R.sub.3 may combine together with the nitrogen atom to which they are attached and form a 5- or 6-membered ring; X.sup..crclbar. represents an anion; Q represents an alkylene group, a phenylene group, an aralkylene group or a group of the formula ##STR2## wherein Y represents an alkylene group or an aralkylene group and R represents an alkyl group; and x, y and z represent the molar percentage of the respective units in the polymer and x is about 0.5 to 10%, y is about 0 to 60% and z is about 30 to 99.5%.
摘要:
A semiconductor integrated circuit includes a constant current circuit and a start-up circuit. The constant current circuit includes a first current mirror circuit including a first and second transistors; and a second current mirror circuit including a third transistor connected to a first node and a fourth transistor connected to a second node. The start-up circuit includes a fifth transistor that supplies start-up current to the constant current circuit via the second node; a sixth transistor that uses a potential of the first node as a control voltage; a seventh transistor that is connected to a third node into which current from the sixth transistor flows and that has a diode-connected configuration; a capacitor connected to a fourth node into which current from the seventh transistor flows; and a latch circuit that controls the fifth based on a potential of the fourth node.