Abstract:
A method, a computer program and an apparatus for measuring a waveform associated with a chemical event occurring on an ISFET sensor array. The waveform includes at least one region associated with expected measured values and at least one region associated with unpredictable measured values. First frame averaging is applied to at least one region associated with the expected measured values. Second frame averaging is applied to at least one region associated with the unpredictable measured values. The second number of frames used for averaging is less than the first number of frames. By the variable frame averaging the amount of stored data can be reduced.
Abstract:
The present disclosure provides methods relating to detecting, identifying and measuring nucleic acids that includes binding metal ions to nucleic acid polymer backbones having negative charges formed as a result of nucleotide incorporation, and detecting or measuring hydrogen ions that are generated as a result of forming metal chelate complexes by addition of chelating agents.
Abstract:
Methods, compositions, systems, apparatus, and kits are provided for depositing samples onto surfaces. The samples can include one or more particles, and the surface can include one or more reaction chambers. In some embodiments, the depositing can include the use of companion particles in combination with sample particles.
Abstract:
A method of fabricating a microwell in an array structure is disclosed herein. The array structure includes a plurality of field effect transistors (FETs), where each FET has a gate structure. The method includes disposing a titanium nitride (TiN) layer on at least one conductive layer coupled to the gate structure of at least one FET. A insulation layer is disposed on the array structure, where the insulation layer lies above the TiN layer. Further, an opening above the gate structure of the at least one FET is etched to remove the insulation layer above the gate structure and to expose the TiN layer. A microwell with at least one sidewall formed from the insulation layer and with a bottom surface formed from the TiN layer is a result of the etching process. The gate structure is specified as a floating gate structure and the FET is an ISFET.
Abstract:
A method, computer program product, and system are provided to calibrate a sensor array with a plurality of sensors. Preferably, the sensor array consists of a plurality of ISFETs which are in fluid communication with a reference electrode. A particular reference voltage is determined, which depends on the maximum value of the overall average gain of the sensors in an array, but also on a maximum number of sensors available for the measurement. The method includes sweeping a voltage of the reference electrode from a first voltage to a second voltage. The output voltage of each of the plurality of sensors is monitored at one or more voltages within the first and second voltages. The gain of each sensor at each of the one or more voltages is determined. An overall average gain of the plurality of sensors is calculated at each of the one or more voltages. Further, an acquisition window for the sensor array is determined. The acquisition window includes a maximum distribution of sensors that provides a maximal overall average gain at a particular reference electrode voltage.
Abstract:
In one implementation, a method is described for operating a chemical sensor. The method includes initiating a chemical reaction proximate to the chemical sensor. The method further includes, during a first time interval of the chemical reaction, closing a bypass switch placed in parallel with a resistor and arranged between an output terminal of the chemical sensor and a capacitor, thereby charging the capacitor to a first voltage based on a voltage at the output terminal due to the chemical reaction. The method further includes opening the bypass switch during a second time interval of the chemical reaction, thereby charging the capacitor to a second voltage based on the voltage at the output terminal. The method further includes generating an output signal for the chemical sensor based on the second voltage on the capacitor.
Abstract:
An apparatus for detecting chemical reactions may be provided. The apparatus may comprise a chemical detection device. The chemical detection device may include a chemical sensor, which may be mounted on the chemical detection device. The apparatus may further comprise a valve block. The valve block may fluidly couple a plurality of reagent containers to the chemical detection device. The apparatus may further comprise a heat exchanger and a controller. The controller may control a fluid connection between the valve block and the chemical detection device. The controller may be also configured to adjust a temperature of a selected reagent from the plurality of reagent containers via the heat exchanger. The temperature of the selected reagent may be adjusted prior to the reagent entering the chemical detection device.
Abstract:
Mathematical models for the analysis of signal data generated by sequencing of a polynucleotide strand using a pH-based method of detecting nucleotide incorporation(s). In an embodiment, the measured output signal from the reaction confinement region of a reactor array is mathematically modeled. The output signal may be modeled as a linear combination of one or more signal components, including a background signal component. This model is solved to determine the nucleotide incorporation signal. In another embodiment, the incorporation signal from the reaction confinement region of a reactor array is mathematically modeled.
Abstract:
A method for correcting nucleotide incorporation signals for fluid potential effects or disturbances arising in nucleic acid sequencing-by-synthesis includes: disposing a plurality of template polynucleotide strands in a plurality of defined spaces disposed on a sensor array, the template polynucleotide strands having a sequencing primer and a polymerase bound therewith; exposing the template polynucleotide strands to a series of flows of nucleotide species flowed through a fluid manifold, the fluid manifold comprising passages for flowing nucleotide species and a branch passage for flowing a solution, the branch passage comprising a reference electrode and a sensing electrode; obtaining a plurality of nucleotide incorporation signals corresponding to the plurality of defined spaces, the nucleotide incorporation signals having a signal intensity related to a number of nucleotide incorporations; and correcting at least some of the plurality of nucleotide incorporation signals for fluid potential effects or disturbances.
Abstract:
Method for processing signals from an integrated circuit device comprising a sensor array and a multiplexer that receives output signals from sensors of the sensor array. The method includes initiating one or more chemical reactions in proximity to sensors in the sensor array. The method further includes receiving a first output signal from a first sensor of the sensor array via a first channel of the multiplexer. The method further includes receiving a second output signal from a second sensor of the sensor array via a second channel of the multiplexer. The method further includes calculating an adjusted second output signal to compensate for cross-talk from the first channel of the multiplexer due to the received first output signal from the first sensor. Corresponding apparatus. Computer readable storage medium storing instructions for operating the apparatus.