An apparatus and method, the apparatus comprising: an information electrode; a ground electrode; a photo-resistive element configured to enable the information electrode to be connected to the ground electrode; and wherein the apparatus is configured to enable a sensor element to be positioned overlaying the photo-resistive element such that a change in optical properties of the sensor element controls the connection between the ground and information electrodes.

A method for determination of an unknown analyte using quantitative electrochemical generation of a detectable species, which provides specified quantities of the species, is described. As an example, free chlorine concentration measurements may be performed using N,N-Diethyl-p-phenylenediamine (DPD), or N,N-bis(2,4-di-sulfobenzyl)toluidinetetrasodium salt (SBT), for obtaining an in-situ calibration curve, whereby matrix effects are eliminated.

A component measurement device for measuring a component of interest in blood on a basis of optical characteristics of a mixture containing a color component produced by a color reaction between the component of interest in the blood and a reagent includes: a first light source configured to emit first irradiation light of a first predetermined wavelength to the mixture; and a second light source configured to emit second irradiation light of a second predetermined wavelength to the mixture, the second irradiation light to be used for estimation of a noise amount contained in a measured value of absorbance of the mixture measured by using the first irradiation light of the first light source, the noise amount being derived other than from the color component.

In an automatic analyzer, an influence due to a disturbance component on a measurement result can be appropriately prevented. An automatic analyzer 1 includes: a first light source 102 configured to emit light toward a sample 44; a drive circuit 101 configured to supply a first drive current I3 whose frequency changes from f1 to f2 intermittently or continuously to the first light source 102; a light receiver 113 configured to output a light detection signal IR based on the light transmitted through the sample 44; and a signal processing circuit 111 configured to demodulate the light detection signal IR in accordance with the frequency f1 to f2 of the first drive current I3 and output a measurement signal VL based on a demodulation result.

Disclosed is a method of preparing a biosensor that involves providing a substrate including a surface having a topographical pattern formed at one or more sites on or in the surface, coating the substrate with a solution including hydrogel particles, wherein the hydrogel particles self-assemble on the surface to mask the surface except at the one or more sites, and binding one or more capture molecules to the one or more sites to form the biosensor. Systems that include the biosensor, as well as methods of using the biosensor, are also disclosed.

Disclosed is a humidity detector, which includes a light emitting part, a light receiving part and a humidity detecting part. The light emitting part and the light receiving part are positioned at two sides of the humidity detecting part along a first direction, and light emitted by the light emitting part is received by the light receiving part after passing through the humidity detecting part. The humidity detecting part includes a light transmittance adjustable part and a humidity sensitive deformation part, the humidity sensitive deformation part is configured to deform along with the change of the ambient humidity, and the light transmittance adjustable part is configured to change the transmittance to the light under the deformation effect of the humidity sensitive deformation part.

A detection chip, a detection method using the same and a manufacturing method thereof are provided. The detection chip includes: a detection baseplate including a first substrate and at least one photoresistor disposed on the first substrate; at least one cantilever beam configured to correspond to the at least one a photoresistor, wherein an orthographic projection of the cantilever beam on the detection baseplate is located within a region where the corresponding photoresistor is located, the cantilever beam has a free end that is separated from the photoresistor by a predetermined distance and that is movable relative to the photoresistor.

In a starch concentration measurement, a liquid sample is conducted from a liquid sample such as pulp suspension or filtrate of a paper, board or tissue process. An iodine solution is added to the sample, and a light absorbance or transmittance of the sample is measured at a target wavelength. The measured absorbance or transmittance of the sample is then converted into the starch concentration of the sample.

Apparatus and methods for the detection of proteins in biological fluids such as urine using a label-free assay is described. Specific proteins are detected by their binding to highly specific capture reagents such as SOMAmers that are attached to the surface of a substrate. Changes to these capture reagents and their local environment upon protein binding modify the behavior of color centers (e.g., fluorescence, ionization state, spin state, etc.) embedded in the substrate beneath the bound capture reagents. These changes can be read out, for example, optically or electrically, for an individual color center or as an average response of many color centers.

The present document describes a method for the detection of off-flavor maple syrup made from buddy maple sap or maple sap contaminated with buddy maple sap, or off-flavor maple sap. The method involves the measurement of a spectrophotometric property of a nanoparticle reactive with a buddy maple sample having a size of from about 1 nm to about 250 nm contacting a maple syrup or maple sap sample. A change in the spectrophotometric property is associated with an off-flavor maple syrup or maple sap sample, and no change in the spectrophotometric property is associated with a good flavor maple syrup or maple sap sample.