Abstract:
Sensor and method to detect localised fluctuations of ionic charge indicating events occuring during a chemical reaction, the sensing apparatus comprising an ion sensitive field effect transistor arranged to generate an electrical output signal in response to localised fluctuations of ionic charge at or adjacent the surface of the transistor, and means for detecting the electrical output signal from the field effect transistor is provided with a polymerase linked layer and the chemical reaction is DNA synthesis, and the localised fluctuations of ionic charge indicate the insertion of di-deoxynucleotide triphosphates and deoxynucleotide triphosphates by detecting a change of hydronium ions with a sensitive Si 3 N 4 layer of the field effect transistor.
Abstract:
Use of a pH sensor comprising an ion-sensitive field effect transistor (ISFET) to perform real time detection/ quantification of nucleic acid amplification, e.g. polymerase chain reaction (PCR) nucleic acid amplification, based on detection of protons released during the primer extension phase.
Abstract:
The present invention relates to a controller unit and methods for controlling an insulin pump. The controller unit includes a user input that receives a gain factor. The gain factor has been calculated based on historical data in relation to a patient. The controller unit includes a measurement input for receiving data representative of a measured blood glucose level for the patient. Processing logic of the controller unit is configured to apply the measured blood glucose level to a pancreatic beta-cell insulin secretion computational model to predict an insulin output level, apply the gain factor to the predicted insulin output level to determine a patient insulin deficiency level, and calculate a control signal for controlling the insulin output level of the insulin pump based on the patient insulin deficiency level. Methods are provided for optimising the gain factor based on the historical data in relation to the patient.
Abstract:
The use of ion sensitive field effect transistor (ISFET) to detect methylated nucleotides in a DNA sample is described. A method of detecting methylated nucleotides in a DNA sample may include the steps of treating a sample of DNA with a reagent which discriminates between methylated and non-methylated nucleotides to provide treated DNA, amplifying the treated DNA and optionally sequencing the amplified DNA. An ISFET is used to monitor the addition of one or more dNTPs in the strand extension reactions during the amplification and/or sequencing step. Suitable apparatus is also provided.
Abstract:
A circuit comprising a digital processor, analogue processing means, a digital to analogue converter for converting digital values output from the digital processor into analogue values which are processed by the analogue processing means, and an analogue to digital converter for converting resulting analogue values into digital values for input to the digital processor, wherein the analogue processing means comprises one or more analogue processors, and the circuit is dynamically reconfigurable under the control of the digital processor, such that analogue values are processed according to a first function by the analogue processing means, and following reconfiguration, analogue values are processed according to a second function by the analogue processing means.
Abstract:
A chemical sensor having a substrate, an electrode formed on or within the substrate, a chemical sensing area formed on the electrode, and coupling means on the substrate to couple the electrode to an active device arranged to receive a signal from the electrode. The active device comprises a transducer arranged to receive the signal from the electrode and provide an output signal. The signal corresponds to the concentration of ions in a sample in contact with the sensor. The sensor may be used to detect neural transmitters in a neural tissue.
Abstract:
A sensor comprising a memory device having a first electrode and a first chemical- sensing layer coupled to the first electrode. The chemical-sensing layer, in the presence of an analyte, is arranged to change a property of the Memristive device. The sensor can detect an analyte by providing a sample to be detected proximate the chemical sensing layer, observing the state of the memory element; and determining a property of the sample by comparing the observed state of the memory element with a previous state. The sensor is manufactured by depositing a second electrode on a surface, depositing an active layer or layers onto said second electrode, depositing a first electrode onto said active layer(s), and coupling a chemically sensitive layer to the first electrode.
Abstract:
Apparatus for converting an M-bit digital signal into an analogue signal. The apparatus comprising means (12,13) for mapping the M-bit digital signal to first and second digital values, so that the ratio of the first to the second digital value is equal to or approximates the value of the M-bit digital signal. First and second digital to analogue converters (14,15) are provided, the first digital to analogue converter (14) having an input for receiving said first digital value and the second digital to analogue converter (15) having an input for receiving said second digital value. Circuit means (16) is coupled to the analogue outputs of the digital to analogue converters (14,15) for dividing one of the analogue outputs by the other, and for providing the result to an output.
Abstract:
There is provided a method and device for measuring an ion concentration of a sample. The method comprises exposing a chemical sensor to the sample to provide an electrical output signal 5 representing said ion concentration and controlling a titrator exposed to the sample to release or absorb a quantity of ions to the sample. The method may use feedback means comprising Pulse Width Modulation control to drive the titrator such that the sample maintains a stable ion concentration.
Abstract:
A method of selecting a product suited to an individual. The method comprises: identifying a product category from a predefined set of product categories, each product category being associated with a set of products; on the basis of said selected product category, selecting a genetic testing cartridge type from a set of available cartridge types, each cartridge type being configured to perform a genotype profiling test on a polynucleotide sample; collecting a polynucleotide sample from the individual; performing a genotype profiling test on said polynucleotide sample using a genetic testing cartridge of the selected genetic testing cartridge type; and using the result of said test to select a product from within the identified product category.