Abstract:
Provided is a method for accurately quantifying a chemical substance contained in a sample solution at a significantly low concentration of not more than 1×10−8M. First, prepared is a measurement system including a counter electrode 13, a first reference electrode 12, a first working electrode 11a, a second working electrode 11b and a second reference electrode 14. Second, voltages of V1 volts and V2 volts (V1>V2) are applied to the first working electrode 11a and the second working electrode 11b, respectively. Third, a voltage difference ΔE between the second working electrode 11b and the second reference electrode 14 is measured. Finally, the concentration of the chemical substance is calculated on the basis of the voltage difference ΔE.
Abstract:
A cellular electrophysiology sensor is adapted to measure an electrical change of a test cell. A chip for the sensor includes a diaphragm, and a thermally-oxidized film mainly containing silicon dioxide on the diaphragm. The diaphragm includes a silicon layer and a silicon dioxide layer on an upper surface of the silicon layer. A through-hole passing through the silicon layer and the silicon dioxide layer is formed. The through-hole has an opening which opens at the silicon dioxide layer and is adapted to capture the test cell. The thermally-oxidized film is provided on an inner wall surface of the through-hole, and unified with the silicon dioxide layer at the opening of the through-hole. This cellular electrophysiology sensor chip can stably capture the test cell and provides a gigaseal stably even if test cells have different properties.
Abstract:
A silicon structure of the present invention is provided with a silicon substrate (1) to become a base, and a plurality of fibrous projections (2) made of silicon dioxide and directly joined to a silicon-made surface (1a) of the silicon substrate (1). By arbitrarily constructing an area where these fibrous projections (2) are formed in a predetermined area, it is possible to render the area to have at least either hydrophilicity or water retentivity, so as to provide a silicon structure useful for a variety of devices.
Abstract:
A sequencer that measures a nucleic acid sequence in a nucleic acid strand includes: a base material having a surface made of silicon, and a fibrous protrusion that is made of silicon dioxide and is directly joined to the surface of the base material made of silicon, wherein a plurality of the nucleic acid strands are fixed onto the fibrous protrusion.