摘要:
In one embodiment, the invention is to a sample metering device, comprising a sample holding chamber oriented between a sample entry port and a sample extraction unit, wherein a portion of said extraction unit defines a metered volume of a sample. A diluent may be transported over and/or through the extraction unit to form a diluted sample for sample analysis. In another embodiment, the invention is to an apparatus and method for rapid determination of analytes in liquid samples by various assays including immunoassays incorporating a sample dilution feature, capable of being used in the point-of-care diagnostic field is provided. The devices and methods of the invention preferably are well-suited for high range sample dilution.
摘要:
Fluid-based no-moving part logic devices are constructed from complex sequences of micro- and nanofluidic channels, on-demand bubble/droplet modulators and generators for programming the devices, and micro- and nanofluidic droplet/bubble memory elements for storage and retrieval of biological or chemical elements. The input sequence of bubbles/droplets encodes information, with the output being another sequence of bubbles/droplets or on-chip chemical synthesis. For performing a set of reactions/tasks or process control, the modulators can be used to program the device by producing a precisely timed sequence of bubbles/droplets, resulting in a cascade of logic operations within the micro- or nanofluidic channel sequence, utilizing the generated droplets/bubbles as a control. The devices are based on the principle of minimum energy interfaces formed between the two fluid phases enclosed inside precise channel geometries. Various devices, including logic gates, non-volatile bistable memory, ring oscillators, bubble synchronizers, analysis chips, sample collectors, and printers have been designed.
摘要:
Fluid-based no-moving part logic devices are constructed from complex sequences of micro- and nanofluidic channels, on-demand bubble/droplet modulators and generators for programming the devices, and micro- and nanofluidic droplet/bubble memory elements for storage and retrieval of biological or chemical elements. The input sequence of bubbles/droplets encodes information, with the output being another sequence of bubbles/droplets or on-chip chemical synthesis. For performing a set of reactions/tasks or process control, the modulators can be used to program the device by producing a precisely timed sequence of bubbles/droplets, resulting in a cascade of logic operations within the micro- or nanofluidic channel sequence, utilizing the generated droplets/bubbles as a control. The devices are based on the principle of minimum energy interfaces formed between the two fluid phases enclosed inside precise channel geometries. Various devices, including logic gates, non-volatile bistable memory, ring oscillators, bubble synchronizers, analysis chips, sample collectors, and printers have been designed.
摘要:
A method of detecting a subject's cancer risk is provided. The method includes: gathering a sample of the subject's body water content via saliva; determining a ratio of cyanide within the subject's body water content and tissue saturation via saliva; providing a threshold cyanide ratio; comparing the ratio of cyanide within the subject's body water content and tissue saturation to the threshold cyanide ratio; and determining the patient's cancer risk based on the comparison of the ratio of cyanide within the subject's body water content to the threshold cyanide ratio.
摘要:
The invention provides a method of circulating magnetically responsive beads within a droplet in a droplet actuator. The invention also provides methods for splitting droplets. The invention, in one embodiment, makes use of a droplet actuator with top and bottom substrates, a plurality of magnetic fields respectively present proximate the top and bottom substrates, wherein at least one of the magnet fields is selectively alterable, and a plurality of droplet operations electrodes positioned along at least one of the top and bottom surfaces. A droplet is positioned between the top and bottom surfaces and at least one of the magnetic fields is selectively altered.
摘要:
A method for determining a biological response of a target (41, 42) to a soluble candidate substance comprises the steps: introducing a soluble candidate substance into a laminar flow of a buffer liquid (2) to form a candidate substance solute (3) having an initial concentration profile (31); dispersing the initial concentration profile (31) to form a dispersed concentration profile (32); directing the dispersed concentration profile (32) into a detection channel (12) to form a final symmetrical concentration profile (33) therein; introducing a target into the detection channel (12) to obtain a combined concentration profile comprising a constant target concentration profile overlying the final symmetrical concentration profile (33); holding in the detection channel (12) at least one half of the combined concentration profile; and optically scanning the combined concentration profile to detect an optical signal representative of the biological response of the target to the soluble candidate substance.
摘要:
A method of changing the response level for any chemical test kits designed for the determination of a metal or compound (such as lead) in paint and other media is disclosed. The invention solves two common problems that exist with using chemical test kits for the detection of lead in paint or other coatings and media: (1) conversion of the paint sample into particles small enough to dissolve the metal in the sample; and, (2) controlling the amount of (paint) sample that gets exposed to the chemicals. This is accomplished by using a coffee grinder or equivalent tool plus a solid (food) product to break up the paint sample into small particles and at the same time dilute the concentration of the metal, while in solid form, down to a level that results in obtaining a positive response at the desired concentration.
摘要:
A sample handling method may include drawing an encapsulating liquid from an encapsulating-liquid input; discharging the drawn encapsulating liquid (a) onto a free surface of a carrier liquid in a carrier-liquid conduit comprising a stabilisation feature and (b) proximate to the stabilisation feature, the encapsulating liquid being immiscible with the carrier liquid, so that the discharged encapsulating liquid does not mix with the carrier liquid, floats on top of the carrier liquid, and is immobilised by the stabilisation feature; drawing a sample liquid from a sample-liquid input; and discharging the drawn sample liquid, the sample liquid being immiscible with the encapsulating liquid and with the carrier liquid, so that the sample liquid does not mix with the encapsulating liquid or with the carrier liquid.
摘要:
A system and method for preparing samples for analyte testing. The sample preparation system can include a freestanding receptacle. The method can include providing a liquid composition comprising a source and a diluent, and positioning the liquid composition in a reservoir defined by the freestanding receptacle. The method can further include filtering the liquid composition to form a filtrate comprising an analyte of interest, removing at least a portion of the filtrate from the sample preparation system to form a sample, and analyzing the sample for the analyte of interest.