摘要:
A circuit for control of an output current in a multiple unit cell array includes an array of unit cells arranged in rows and columns. Each unit cell includes a column select transistor being adapted for control by a column selector and a row select transistor being adapted for control by a row selector. The column select transistor and the row select transistor are connected together in series to each other and between an output node and a first supply. A return electrode is provided to complete the circuit.
摘要:
Methods are provided for the fabrication of microscale, including micron and sub-micron scale, including nanoscale, devices. Electronic transport of movable component devices is utilized through a fluidic medium to effect transport to a desired target location on a substrate or motherboard. Forces include electrophoretic force, electroosmotic force, electrostatic force and/or dielectrophoretic force. In the preferred embodiment, free field electroosmotic forces are utilized either alone, or in conjunction with, other forces. These forces may be used singly or in combination, as well as in conjunction with yet other forces, such as fluidic forces, mechanical forces or thermal convective forces. Transport may be effected through the use of driving electrodes so as to transport the component device to yet other connection electrodes. In certain embodiments, the component devices may be attached to the target device using a solder reflow step.
摘要:
Disclosed herein is a device for measuring fluid dispense volumes including one or more wells adapted to receive a fluid; a tube having an internal passageway fluidly coupled to the one or more wells, wherein fluid in the wells passes into the internal passageway via capillary action to form a fluid column having a meniscus spaced from the wells; and a scale coupled to the tube, the scale calibrated to provide an indication of the volume of the fluid based upon the location of the meniscus in the fluid passageway.
摘要:
Methods of addressing a biomolecule to a selectively addressable electrode are described. A permeation layer overlying a plurality of selectively addressable electrodes is provided. The permeation layer includes a reactive group that is adapted to bond to a biomolecule and that requires activation through a chemical transformation before bonding to the biomolecule. At least one selectively addressable electrode is biased such that a pH change occurs in an overlying solution of the at least one selectively addressable electrode. The reactive group in a portion of the permeation layer above the at least one selectively addressable electrode is then chemically transformed to an activated reactive group as a result of the pH change. A biomolecule is then bound to the permeation layer overlying the at least one selectively addressable electrode through the activated reactive group.
摘要:
A method for analyzing nucleic acid obtained from a cell sample on a platform is described. A platform having a cell selector, a nucleic acid selector, and an array of microlocations, wherein at least one microlocation has an associated capture sequence, is provided. The cell selector is contacted with a cell sample, wherein a portion of the cells remain associated with the cell selector. At least a portion of cells associated with the cell selector are lysed to release a nucleic acid sample. The nucleic acid selector is then contacted with the nucleic acid sample, such that a portion of the nucleic acid sample remains associated with the nucleic acid selector. The associated nucleic acid sample is then released from the nucleic acid selector and then is contacted with the array of microlocations, such that at least a portion of the released nucleic acid sample hybridizes with the capture sequence.
摘要:
We have performed separation of bacterial and cancer cells from peripheral human blood in microfabricated electronic chips by dielectrophoresis. The isolated cells were examined by staining the nuclei with fluorescent dye followed by laser induced fluorescence imaging. We have also released DNA and RNA from the isolated cells electronically and detected specific marker sequences by DNA amplification followed by electronic hybridization to immobilized capture probes. Efforts towards the construction of a “laboratory-on-a-chip” system are presented which involves the selection of DNA probes, dyes, reagents and prototyping of the fully integrated portable instrument.
摘要:
Devices and methods for performing separation of cell particles by dielectrophoresis in three dimensions. In one embodiment the device comprises a flow chamber having microfabricated chip with a plurality of vertical and horizontal electrodes, which may be coated with a protective layer to prevent direct contact between any electrode and a sample. The horizontal electrodes are in electrical communication with a DC or an AC power source, while the vertical electrodes are in electrical communication with an AC power source.