Abstract: Paper microfluidic devices for testing for explosives are provided, along with methods of fabricating and using the same. One or more channels are formed on a paper substrate, and a test spot is formed in at least one of the channels. The channels can be hydrophobic. A test reagent is provided in the test spot and tests for explosives.

Abstract: Paper microfluidic devices for testing for explosives are provided, along with methods of fabricating and using the same. One or more channels are formed on a paper substrate, and a test spot is formed in at least one of the channels. The channels can be hydrophobic. A test reagent is provided in the test spot and tests for explosives.

Abstract: An analyte testing device is provided for use with a mobile processing device having a camera with a lens, a processor for processing an image captured by the lens. The analyte testing device comprises a casing and a test strip positioner. The test strip positioner positions an analyte containing test strip adjacent to the camera lens to permit the camera to capture an image of the analyte containing test strip. A light source is disposed within the casing. The light source is positioned within the casing to illuminate the analyte containing test strip to facilitate the capture of the image of the test strip. Software is contained within the mobile processing device for performing a quantitative analysis of at least one analyte from the captured image, and providing an output of the results of the quantitative analysis.

Abstract: Embodiments of the invention provide lateral flow and flow-through bioassay devices based on patterned porous media, methods of making same, and methods of using same. Under one aspect, an assay device includes a porous, hydrophilic medium; a fluid impervious barrier comprising polymerized photoresist, the barrier substantially permeating the thickness of the porous, hydrophilic medium and defining a boundary of an assay region within the porous, hydrophilic medium; and an assay reagent in the assay region.

Abstract: The present invention provides assays and devices for detection of substances in liquid samples. The assays and devices utilize passive diffusion between a porous material and a porous membrane containing a specific binding pair member to enable detection of the substance of interest.

Abstract: Methods and apparatuses for determining whether a fluid has been introduced into an assay measurement apparatus involving delivering a fluid to a surface of a resonant device. The methods also involve monitoring an electrical signal output by the resonant device, wherein properties of the electrical signal vary based on physical properties of the fluid in contact with the surface of the resonant device and determining if the electrical signal output by the resonant device satisfies a predetermined condition indicative of the presence of the fluid.

Abstract: Provided are methods, devices and systems that utilize free-surface fluidics and SERS for analyte detection with high sensitivity and specificity. The molecules can be airborne agents, including but not limited to explosives, narcotics, hazardous chemicals, or other chemical species. The free-surface fluidic architecture is created using an open microchannel, and exhibits a large surface to volume ratio. The free-surface fluidic interface can filter interferent molecules, while concentrating airborne analyte molecules. The microchannel flow enables controlled aggregation of SERS-active probe particles in the flow, thereby enhancing the detector's sensitivity.

Abstract: The measuring device of the invention includes: a first container and a second container for holding a sample; and an optical measurement part for carrying out an optical measurement. The first container has a first sample supply inlet for supplying a sample containing an analyte to the first container and at least one electrode. The second container has a second sample supply inlet for supplying the sample to the second container and a reagent holding part for holding a reagent for the optical measurement.

Abstract: Embodiments of the invention provide lateral flow and flow-through bioassay devices based on patterned porous media, methods of making same, and methods of using same. Under one aspect, an assay device includes a porous, hydrophilic medium; a fluid impervious barrier comprising polymerized photoresist, the barrier substantially permeating the thickness of the porous, hydrophilic medium and defining a boundary of an assay region within the porous, hydrophilic medium; and an assay reagent in the assay region.

Abstract: An improved detection reaction for benzene in gas analysis with a gas detector tube formed of a carrier material impregnated with gold(III) oxide in a display layer.

Abstract: Provided are methods, devices and systems that utilize free-surface fluidics and SERS for analyte detection with high sensitivity and specificity. The molecules can be airborne agents, including but not limited to explosives, narcotics, hazardous chemicals, or other chemical species. The free-surface fluidic architecture is created using an open microchannel, and exhibits a large surface to volume ratio. The free-surface fluidic interface can filter interferent molecules, while concentrating airborne analyte molecules. The microchannel flow enables controlled aggregation of SERS-active probe particles in the flow, thereby enhancing the detector's sensitivity.

Abstract: Methods and apparatuses for performing assays involving binding material elements with a plurality of bonds over a substantial area of a surface of a resonant device establishing a normalized exposure. The methods and apparatuses also involve controlling an external influence applied to the material elements over a first period of time and measuring a signal during a second period of time that is indicative of the change in the amount of material elements bound to the surface relative to the normalized exposure. In some cases, the measured signals are integrated with respect to time to determine the time averaged amount of material elements bound to the surface.

Abstract: Various methods for forming dyed microspheres are provided. One method includes attaching a hydrophilic dye to chemical groups to form a bubble. The bubble includes the chemical groups surrounding the hydrophilic dye and an aqueous solution. The chemical groups are soluble in aqueous and organic solvents. The method also includes disposing the bubble and a microsphere to be dyed in a solvent such that the bubble is incorporated into the microsphere thereby dyeing the microsphere. Another method includes adsorbing a hydrophilic dye on a surface of a hydrophobic polymer core of a microsphere to be dyed thereby dyeing the microsphere. The method also includes attaching chemical groups to the hydrophilic dye. The chemical groups are soluble in aqueous and organic solvents. The chemical groups attached to the hydrophilic dye form an enclosure surrounding the hydrophilic dye and an aqueous solution.

Abstract: Provided are methods, devices and systems that utilize free-surface fluidics and SERS for analyte detection with high sensitivity and specificity. The molecules can be airborne agents, including but not limited to explosives, narcotics, hazardous chemicals, or other chemical species. The free-surface fluidic architecture is created using an open microchannel, and exhibits a large surface to volume ratio. The free-surface fluidic interface can filter interferent molecules, while concentrating airborne analyte molecules. The microchannel flow enables controlled aggregation of SERS-active probe particles in the flow, thereby enhancing the detector's sensitivity.

Abstract: Test device for detection and visual indication of a specific analyte in a liquid sample such as a body fluid. The device includes a biodegradable housing, a test strip and a lid. The device is configured for placement in concentrate or dilute test liquid that is for example contained in a vessel. One end of the test strip wicks the liquid being tested into the housing and across a control site and test site which provide visual indication that the device is working correctly and whether the analyte being tested is present in the test liquid. An antibody specific to the antigen being tested may be provided on the test strip. The test device for example detects specific antigens in dilute urine, such that the device may be placed in a toilet bowl after urination.

Abstract: A gas analyzer apparatus includes a device or platform for supporting a predetermined quantity of a reagent capable of reacting with a predetermined gas to cause a detectable change in a characteristic of the reagent, a reservoir adapted to retain the reagent, a dispenser for dispensing a controlled quantity of the reagent from the reservoir to a predetermined position on the device for supporting the predetermined quantity of the reagent, and a detector that detects the presence of the predetermined gas upon the predetermined gas and the controlled quantity of reagent reacting to cause a detectable change in a characteristic of the reagent detectable by the detector, the detector adapted to detect a change in the controlled quantity of the reagent by detecting the change in the characteristic through the predetermined quantity of the reagent.

Abstract: Apparatus for ozonation of fluids includes a source of ozone, a fluid medium, and a container for receiving the fluid medium. Following charging of the fluid medium with ozone, an ozone sensor, which may be an ink, is utilized for determining the ozone content in the fluid medium within the container.

Abstract: Provided are methods, devices and systems that utilize free-surface fluidics and SERS for analyte detection with high sensitivity and specificity. The molecules can be airborne agents, including but not limited to explosives, narcotics, hazardous chemicals, or other chemical species. The free-surface fluidic architecture is created using an open microchannel, and exhibits a large surface to volume ratio. The free-surface fluidic interface can filter interferent molecules, while concentrating airborne analyte molecules. The microchannel flow enables controlled aggregation of SERS-active probe particles in the flow, thereby enhancing the detector's sensitivity.

Abstract: Methods and apparatus for analyzing bioprocess fluids are provided. A plurality of particles coated with a plurality of capture agents having an affinity for one or more biological markers is combined with bioprocess fluid to form a plurality of analyte-particle complexes. The system also includes a transport arrangement for transporting the sample to a sensor surface, and optionally a magnetic field inducing structure constructed and arranged to establish a magnetic field at and adjacent to the sensor surface. The resonant sensor produces a signal corresponding to an amount of analyte-particle complexes that are bound to the sensor surface.

Abstract: The present invention relates to a method and apparatus for determining blood oxygen transport, and to measure lipid levels by correlating these levels with the rate at which oxygen diffuses through the red blood cell membrane.

Abstract: Methods for detecting estradiol and metabolites thereof in a sample are provided. A plurality of particles, each of which is coated with a capture agent having an affinity for estradiol, is combined with the sample to form a plurality of estradiol-particle complexes. The system also includes a transport arrangement for transporting the sample and/or particles to the sensor surface, and optionally a magnetic field inducing structure constructed and arranged to establish a magnetic field at and adjacent to the sensor surface. The resonant sensor produces a signal corresponding to an amount of estradiol-particle complexes that are bound to the sensor surface.

Abstract: Analytical reagents and mass spectrometry-based methods using these reagents for the rapid, and quantitative analysis of proteins or protein function in mixtures of proteins. The methods employ affinity labeled protein reactive reagents having three portions: an affinity label (A) covalently linked to a protein reactive group (PRG) through a linker group (L). The linker may be differentially isotopically labeled, e.g., by substitution of one or more atoms in the linker with a stable isotope thereof. These reagents allow for the selective isolation of peptide fragments or the products of reaction with a given protein (e.g., products of enzymatic reaction) from complex mixtures. The isolated peptide fragments or reaction products are characteristic of the presence of a protein or the presence of a protein function in those mixtures. Isolated peptides or reaction products are characterized by mass spectrometric (MS) techniques.

Abstract: Disclosed is a method for determining the swellability and the swelling kinetics of superabsorbent material (9) such as polymer gels, for example, which comprises introducing a defined volume of the dry superabsorbent material (9) into a measuring vessel (7), using a movable element (4) within said measuring vessel (7) to apply a restraining force (12) to said superabsorbent material (9) and capturing the expansion of said superabsorbent material (9) contactlessly within a chamber (14) in a continuous manner by capturing the change in height of a piston (4) which bounds said chamber (14), travels in a measuring vessel (7) and is marked with a height scale (6).

Abstract: Apparatus for taking up liquid analytes having a microtitre plate with a plurality of wells and a plurality of pipettes, as well as a pump, which is coupled to several pipettes in such a way that an analytes can be simultaneously sucked out of several wells or introduced into several wells by actuating the pump.

Abstract: An apparatus for measuring the concentration of formaldehyde in an exhaust stream from turbines, internal combustion engines and the like, which apparatus includes a portable housing having a sample gas inlet through which a sample gas for analysis is introduced into the portable housing and an analysis system disposed in the portable housing suitable for analyzing the sample gas for the presence of formaldehyde in the sample gas.

Abstract: Methods using gel electrophoresis and mass spectrometry for the rapid, quantitative analysis of proteins or protein function in mixtures of proteins derived from two or more samples in one unit operation are disclosed.

Abstract: Analytical reagents and mass spectrometry-based methods using these reagents for the rapid, and quantitative analysis of proteins or protein function in mixtures of proteins. The methods employ affinity labeled protein reactive reagents having three portions: an affinity label (A) covalently linked to a protein reactive group (PRG) through a linker group (L). The linker may be differentially isotopically labeled, e.g., by substitution of one or more atoms in the linker with a stable isotope thereof. These reagents allow for the selective isolation of peptide fragments or the products of reaction with a given protein (e.g., products of enzymatic reaction) from complex mixtures. The isolated peptide fragments or reaction products are characteristic of the presence of a protein or the presence of a protein function in those mixtures. Isolated peptides or reaction products are characterized by mass spectrometric (MS) techniques.

Abstract: A method of determining a surface property of a plurality of solids by contacting the solids with a fluid, measuring the radiation emitted, absorbed, or altered during desorption of the fluid using a detector, and then determining at least one surface property of the solids from the radiation measurements has been invented. The invention is particularly useful in combinatorial applications in order to evaluate a plurality of solids or mixtures of solids to determine at least one surface property of each of the solids.

Abstract: A combustion gas detection apparatus includes a transparent tube partially filled with a combustion gas sensing fluid and an inlet fitting for engagement with the radiator cap of an engine cooling system and an outlet fitting connected with a vacuum port of the engine.

Abstract: The present invention relates to a method and apparatus for determining blood oxygen transport, and to measure lipid levels by correlating these levels with the rate at which oxygen diffuses through the red blood cell membrane.

Abstract: An immunological test kit suitable for the rapid detection of ciguatoxin and related low molecular weight lipid polyether marine toxins in fish tissues in the field, home or laboratory. The test procedure utilizes a synthetic membrane laminated onto one end of a solid plastic stick, which is immersed into alcohol with a piece of fish tissue. The membrane is then removed and dried thoroughly, then placed in the suspension of mixed colored beads coated with anti-ciguatoxin. The membrane is then rinsed in water and the intensity of the color compared with a standard range of colors formed (0-3+). The color intensity is proportional to the concentration of toxin in the piece of tissue. The kit includes the synthetic membrane on a plastic stick, a suspension of mixed colored beads coated with anti-ciguatoxin antibody, testing instruments, and a supply of solvent.

Abstract: The present invention is directed to a system and method for detecting the presence of semen on material. The system includes a solution of sodium phosphate, maleic acid, dye fast blue salt, naphthyl acid phosphate and deionized water, together with a solution dispenser and absorbent paper. The method for detecting the presence of semen on material using a semen detection solution and absorbent paper includes wetting the suspected semen stain or stain area on the material; blotting the suspected stain or stain area with absorbent paper so as to transfer the moisture from the wetted suspected semen stain or stain area on the material to the absorbent paper; drying the absorbent paper; and applying semen detection solution to the absorbent paper at the location of the transferred suspected stain or stain area.

Abstract: Analytical reagents and mass spectrometry-based methods using these reagents for the rapid, and quantitative analysis of proteins or protein function in mixtures of proteins. The methods employ affinity labeled protein reactive reagents having three portions: an affinity label (A) covalently linked to a protein reactive group (PRG) through a linker group (L). The linker may be differentially isotopically labeled, e.g., by substitution of one or more atoms in the linker with a stable isotope thereof. These reagents allow for the selective isolation of peptide fragments or the products of reaction with a given protein (e.g., products of enzymatic reaction) from complex mixtures. The isolated peptide fragments or reaction products are characteristic of the presence of a protein or the presence of a protein function in those mixtures. Isolated peptides or reaction products are characterized by mass spectrometric (MS) techniques.

Abstract: The presence of carcinogens in air, soils, and other areas is detected by combining liquid-assisted air sampling with means for testing liquid samples for mutagenicity. Hazardous or illicit substances or pathogens which may be buried in the ground or otherwise concealed or present in contaminated food at various stages of food processing are detected using a two-line probe such that one of the lines directs exhaust air from the sampler onto suspect surfaces so as to dislodge and blow off droplets, particles or insects therefrom while the other line draws some of them into the sampler. Variants of said two-line probe can also serve to collect lead, hexavalent chromium or other harmful substances and bacterial, fungal or viral pathogens from crumbling walls or floors. Liquid-assisted air sampling can also serve to capture disease-transmitting insects and detect and identify insect-borne pathogens.

Abstract: A method and apparatus for urine self testing wherein the apparatus is placed directly into the toilet after urination which avoids the direct placement and retention of an apparatus in the stream of urine as is common with urine testing devices. The apparatus detects the presence of certain chemicals in dilute urine such as the presence of human chorionic gonadotropin (hCG) in the urine of a pregnant woman. An opening in the apparatus is fitted with a fluid absorption device which acts to concentrate the diluted urine on an indicator strip which contains antibodies, enzymes and antibody blockers which will provide a reactive change, usually of color, when subjected to a predetermined chemical such as hCG. The apparatus functions in dilute urine when placed in a toilet after urination and is largely constructed of biodegradable materials so that it can be flushed into the sewage system or a septic tank.

Abstract: A method is described for determining the presence of a volatile component in a test sample. The method involves use of two separate vessels, one of which is capable of being placed wholly within the other vessel. The test sample is placed in the larger vessel, and an indicator solution is placed in the smaller, inner vessel. Then a gas-tight closure is placed on the top of the outer, larger vessel. The assembly is heated to an elevated temperature, whereby the volatile target analyte which is released from the test sample transfers to the inner vessel and is absorbed by the indicator solution. The indicator solution can be analyzed by means of a calorimeter, spectrophotometer, etc.

Abstract: In accordance with the present invention, there are provided articles for use in non-invasive measurements of nitric oxide levels in a variety of fluid media, e.g., in mammalian body fluids. Articles according to the present invention comprise a nitric oxide trapping agent contained within a vessel, wherein the vessel comprises a semi-permeable membrane. Nitric oxide diffuses through the semi-permeable membrane and is trapped therein for subsequent quantitative analysis. Articles of the present invention are particularly useful in selectively detecting nitric oxide in the presence of other NOx species.

Abstract: Microporous solid phase materials that are suitable for lateral flow and other assays for detecting the presence of analytes in test samples, that are stable under variations in humidity and, even after storage for extended periods of time, can form stable covalent bonds with molecules containing a free primary or secondary amine group or sulfhydryl group are described. The invention further concerns chemically derivatized solid phase materials, and conjugates comprising such materials. Examples of lateral flow devices for the quantitative or semi-quantitative determination of an analyte in a biological sample are described.

Abstract: A test strip incubation device and method for developing a test strip having a reagent test pad disposed thereon, the reagent test pad requiring an incubation time, which allows greater accuracy and reliability of test results as well as a narrower window of PASS and FAIL indication concentrations. The device comprises a test strip holder which allows a wetted reagent test pad to be vertically stored in an enclosed reaction chamber during the incubation period. The reaction chamber is bounded by a substantially clear material to allow the user to easily observe the status of the reagent test pad held in the reaction chamber. The enclosed reaction chamber provides a high humidity environment for minimizing water evaporation from the reagent test pad during the incubation period. The device may be economically formed from low cost materials, is simple to use and facilitates disposal of the sample material after testing.

Abstract: A bacterium can be detected and examined with identification thereof by simply and specifically labeling the bacterium itself without resort to a change in color tone due to the metabolism of a fermentable substrate or the like, whereby there is provided an excellent method of detecting a bacterium with a simple operation, a shortened determination time, an improvement in efficiency and an improvement in detection accuracy.

Abstract: A test strip incubation device and method for developing a test strip having a reagent test pad disposed thereon, the reagent test pad requiring an incubation time, which allows greater accuracy and reliability of test results as well as a narrower window of PASS and FAIL indication concentrations. The device comprises a test strip holder which allows a wetted reagent test pad to be vertically stored in an enclosed reaction chamber during the incubation period. The reaction chamber is bounded by a substantially clear material to allow the user to easily observe the status of the reagent test pad held in the reaction chamber. The enclosed reaction chamber provides a high humidity environment for minimizing water evaporation from the reagent test pad during the incubation period. The device may be economically formed from low cost materials, is simple to use and facilitates disposal of the sample material after testing.

Abstract: An immunochemical assay device comprising a base member, an array disposed on the base member, and at least one assay indicia zone. The array comprises (i) a reservoir pad to receive sample liquid, (ii) a wicking membrane, and (iii) at least one filter zone interposed between the wicking membrane and the reservoir pad. The filter zone being operable to permit passage of any specific immunocomplex to the wicking membrane while impeding passage of larger components.

Abstract: A test strip incubation device and method for developing a test strip having a reagent test pad disposed thereon, the reagent test pad requiring an incubation time, which allows greater accuracy and reliability of test results as well as a narrower window of PASS and FAIL indication concentrations. The device comprises a test strip holder which allows a wetted reagent test pad to be vertically stored in an enclosed reaction chamber during the incubation period. The reaction chamber is bounded by a substantially clear material to allow the user to easily observe the status of the reagent test pad held in the reaction chamber. The enclosed reaction chamber provides a high humidity environment for minimizing water evaporation from the reagent test pad during the incubation period. The device may be economically formed from low cost materials, is simple to use and facilitates disposal of the sample material after testing.

Abstract: The invention relates to a method for determining foaming behavior of a liquid by use of a gas, which includes supplying the gas to an amount of the substantially gas-free liquid to form a foam and analyzing one or more properties of the foam, wherein the gas is supplied through a grid provided with holes having a diameter of 25 to 100 .mu.m, which holes are located at a mutual distance of 5 to 15 times the diameter of the holes.

Abstract: Non-invasive methods have been developed for the measurement of NO levels in a variety of fluid media, e.g., body fluids. The present invention embraces the use of a semi-permeable vessel wherein said vessel contains an NO reacting substance to trap NO diffusing thereinto, and a simple physical or chemical detection method to measure the levels of the end products. Since NO is a neutral gas molecule, it is capable of diffusing freely across a wide range of biocompatible polymer membranes which exhibit a high permeability to NO and other neutral gas molecules, such as O.sub.2 and CO.sub.2, but which are not permeable to charged molecules, such as NO.sub.3.sup.- or NO.sub.2.sup.-. The latter two compounds are ubiquitously present in body fluids and often interfere with the measurement of NO levels. The permeability of selected membranes to NO, but not to NO.sub.3.sup.- or NO.sub.2.sup.

Abstract: The present invention provides a process for determining the smoke content of an edible oil of a given amount, which comprises heating the edible oil to a temperature necessary to generate smoke; collecting the generated smoke by sulfuric acid; and determining the smoke content of the edible oil by colorimetry through comparing the color index of the collected smoke in sulfuric acid with the pre-established calibration function representing the relationship between the color index and concentration of the edible oil smoke in sulfuric acid.

Abstract: An apparatus and method of equilibrating the dissolved gas composition of an aqueous fluid to reflect the predetermined gas composition contained in a gas equilibration reservoir. The equilibrated aqueous fluid can be used in a method of determining the concentration of a dissolved gas in a fluid sample. In one embodiment, the method is used to control the equilibrated gas composition of a calibrant fluid which, in turn, is used to measure the concentration of a dissolved gas, such as oxygen and carbon dioxide, in a sample fluid, such as whole blood.

Abstract: Disclosed is an apparatus and method of equilibrating the dissolved gas composition of an aqueous fluid to reflect the predetermined gas composition contained in a gas equilibration reservoir. The equilibrated aqueous fluid can be used in a method of determining the concentration of a dissolved gas in a fluid sample. In one embodiment, the disclosed method is used to control the equilibrated gas composition of a calibrant fluid which, in turn, is used to measure the concentration of a dissolved gas, such as oxygen and carbon dioxide, in a sample fluid, such as whole blood.

Abstract: Disclosed is an apparatus and method of equilibrating the dissolved gas composition of an aqueous fluid to reflect the predetermined gas composition contained in a gas equilibration reservoir. The equilibrated aqueous fluid can be used in a method of determining the concentration of a dissolved gas in a fluid sample. In one embodiment, the disclosed method is used to control the equilibrated gas composition of a calibrant fluid which, in turn, is used to measure the concentration of a dissolved gas, such as oxygen and carbon dioxide, in a sample fluid, such as whole blood.

Abstract: The present invention provides an improved method of detecting or transferring a biological material whereby a biological material is adhered to a membrane which is then contacted with a detecting reagent, wherein the improvement comprises utilizing a polyvinylidene fluoride membrane which has been subjected to a temperature of at least about 80.degree. C. but less than the temperature at which the membrane softens and deforms for a time sufficient to reduce the ability of the detecting reagent to directly adhere to the membrane.