Abstract:
A method for rapidly detecting the presence or absence of a particular nucleic acid sequence at a candidate locus in a target nucleic acid sample comprises the steps of: i) introducing a modified base which is a substrate for a DNA glycosylase into said candidate locus at one or more preselected positions; ii) excising the modified base by means of said DNA glycosylase so as to generate an abasic site; iii) cleaving phosphate linkages at abasic sites generated in step ii); and iv) analysing the cleavage products of step iii) so as to identify in said target nucleic acid sequence the presence or absence of said particular nucleic acid sequence at said candidate locus. The method has particular application for detecting specific mutations in a DNA sample, including the detection of multiple known mutations in DNA. Large throughput of sample can be achieved rapidly and easily.
Abstract:
A data capture system (1) has modular amplifier circuits (10) connected to modular capture circuits (11) within a rotor 2. Each capture circuit (11) has an FPGA (26) operation according to low-frequency and high-frequency state machines (M1, M2) to control ADCs (25) and upload from memories (30) to a host (15). During sampling, each FPGA (26) runs through a ready mode, a sampling mode, and again a ready mode according to a host command.
Abstract:
An ac/dc converter (1) has a closed loop controller (3) to maintain a well regulated output voltage (V o ) with low peak-to-peak ripple. A resonant capacitor ( C in ) across the rectifier bridge ( D R1 -D R4 ), and a resonant inductor ( L R ) between the bridge and the isolation transformer provide inherent power factor correction. A clamping diode ( D CL ) is connected between the dc rectifier bridge positive terminal and the bulk capacitor ( C B ). There is also a second resonant capacitor ( C t ) across the isolation transformer. There is zero voltage switching of the power switches ( Q1 , Q2 ).
Abstract:
In apparatus for conveying batches of ice lumps from a storage hopper (2) to remotely located ice dispensers (7), ice lumps from the storage hopper (2) are delivered into the main conduits (5) through corresponding main valves (20) and connecting conduits (25) extending between each main valve (20) and the storage hopper (2). Metering valves (14) meter batches of ice lumps of predetermined size into the main conduits (5). Conveying air from an air blower (10) is supplied to the main conduits (5) through the main valves (20) for conveying the batches of ice lumps. In use, batches of ice lumps are intermittently delivered into the main conduit (5), and the batches of ice lumps and conveying air are alternately supplied to the main conduit (5).
Abstract:
In apparatus for conveying batches of ice lumps from a storage hopper (2) to remotely located ice dispensers (7), ice lumps from the storage hopper (2) are delivered into the main conduits (5) through corresponding main valves (20) and connecting conduits (25) extending between each main valve (20) and the storage hopper (2). Metering valves (14) meter batches of ice lumps of predetermined size into the main conduits (5). Conveying air from an air blower (10) is supplied to the main conduits (5) through the main valves (20) for conveying the batches of ice lumps. In use, batches of ice lumps are intermittently delivered into the main conduit (5), and the batches of ice lumps and conveying air are alternately supplied to the main conduit (5).
Abstract:
An optical slip ring system (1) has rotor interface (2) which can bolt on to a high speed rotor in a modular manner. The rotor interface (2) has circular circuit boards (7) containing the necessary drive circuits and power supply circuits for transducers mounted on the rotor. The drive circuit on the boards (7) drive three rings of emitter LEDs (9). The drive is frequency modulated and there are a number of transducers associated with each ring of emitter LEDs (9). These signals are frequency division multiplexed to ensure real time processing takes place. A fixed support (3) has a single receiver LED (15) associated with each ring of emitter LEDs (9). Contactless power is provided by an inductive power supply having a primary winding (16) on the fixed support bracket (3) and a secondary winding (10) on the rotor interface (2). .