Abstract:
The present invention provides articles resistant to the adsorption of proteins, cells and bacteria. The articles can either have a chemical chain bonded thereon where the chemical chain can comprise a terminal group free of a hydrogen bond donor or where a hydrogen bond donor is sufficiently buried such that an exposed surface of the article including the chemical chain is free of a hydrogen bond donor. The chemical chain, or plurality of chemical chains, can comprise a monolayer such as a self-assembled monolayer (SAM) which can be homogeneous (one type of SAM) or mixed, i.e. or more different types of SAMs. Other more specific examples of chemical chains are provided. The plurality of chemical chains can comprise a polymer such as a polyamine. In many aspects, the plurality of chemical chains is sufficiently free of cross-linking or branching. The present invention also provides an article capable of specific binding of a desired biomolecule while preventing non-specific binding of biomolecules.
Abstract:
The present invention provides a masking system for selectively applying cells to predetermined regions of a surface. A mask is positioned adjacent to a surface to cover some portions of the surface while allowing other portions of the surface to remain uncovered. Cells then are applied to uncovered portions of the surface and the mask removed. Alternatively, a cell-adhesion promoter is applied to uncovered portions of the surface, and then cells are applied to the surface before or after removal of the mask from the surface. The masking system can be pre-coated, at least on those surfaces which will come into contact with cells, with a cell-adhesion inhibitor to resist absorption of cells and thereby avoid cell damage when the mask is removed (if cells are deposited prior to removal of the mask). A polymeric elastomeric mask that comes into cohesive-conformal contact with a surface to be patterned can be used.
Abstract:
A method and apparatus for providing electric microcontact printing is provided. A stamp is brought into contact with the surface of a substrate to provide high resolution features. Aspects of the invention may be used for data storage, microcontact printing, and for other applications requiring high resolution pattern transfer.
Abstract:
A microfluidic, electrochemical device for detecting a genetic material is described, including: one or more cellulosic layers comprising at least one of a hydrophilic test zone and a hydrophilic sample deposition zone in fluid communication with each other; one or more amplification agents selected for amplifying a genetic material and embedded in the hydrophilic test zone or the sample deposition zone; one or more binding agents embedded in the test zone or the sample deposition zone and selected for binding the amplified genetic material to result in a change of the concentration of a signaling chemical, wherein the signaling chemical is either embedded in the test zone or the sample deposition zone prior to the binding or is a newly generated product of the binding; and an electrode assembly comprising one or more electrodes in fluidic contact with the test zone and configured to interact with the signaling chemical to result in a current change readable by an electrochemical reader. Methods of using the device and kit containing the device are also described.
Abstract:
A soft robotic device with a variety of sensors and/or imaging areas is described. The sensor and/or imaging area may be embedded in the soft body or the strain limiting layer of the soft robotic device, attached to the soft body or the strain limiting layer of the soft robotic device, or otherwise linked to the soft body or the strain limiting layer of the soft robotic device.
Abstract:
Systems and methods for providing flexible robotic actuators are disclosed. Thanks to the concentrical positioning of a plurality of inflatable channels, the claimed soft robot is capable of providing a radial deflection motion. A method for operating the disclosed robotic systems is also disclosed.
Abstract:
Soft pneumatic actuators based on composites consisting of elastomers (130) with embedded sheet or fiber structures, e.g., paper or fabric, (149) that are flexible but not extensible are described. On pneumatic inflation, these actuators move anisotropically, based on the motions accessible by their composite structures. They are inexpensive, simple to fabricate, light in weight, and easy to actuate. This class of structure is versatile: the same principles of design lead to actuators that respond to pressurization with a wide range of motions (bending, extension, contraction, twisting, and others). Paper, when used to introduce anisotropy into elastomers, can be readily folded into three-dimensional structures following the principles of origami; these folded structures increase the stiffness and anisotropy of the elastomeric actuators, while keeping them light in weight.
Abstract:
The invention features an assay device, a microfluidic device, and a method of detecting the presence of high electrolyte concentration in a fluid sample. The assay device comprises a porous, hydrophilic substrate; a fluid-impermeable barrier defining a boundary of an assay region and a boundary of a main channel region, the main channel region fluidically connected to the assay region; and a strip of conductive material disposed on the porous, hydrophilic substrate. The microfluidic device comprises a porous, hydrophilic substrate; a fluid-impermeable barrier, the barrier permeating the thickness of the porous, hydrophilic substrate and defining within the porous, hydrophilic substrate a boundary of an open-ended channel having first and second lateral walls; and an electrically conductive pathway disposed on the porous, hydrophilic substrate, the electrically conductive pathway comprising (i) a strip of conductive material forming an open circuit in the absence of an electrically conductive material bridging the first and second lateral walls; and (ii) a battery, an electrically-responsive indicator, and a resistor electrically connected to the strip of conductive material.
Abstract:
The present invention discloses a method of purifying bivalent antibodies or antibody fragments that are active at both Fab sites from a source of antibodies or antibody fragments using a non-chromatographic method that includes inducing the formation of cyclic immunoglobulin aggregates by addition of multivalent hapten to a salt solution of soluble antibodies or antibody fragments, wherein the multivalent hapten possesses a linker between the two haptens effective to prevent the binding of both haptens of the ligand to the same antibody or antibody fragment.
Abstract:
A microfluidic valve assembly includes a structure defining a microfluidic fluid path and an actuator that can be moved between different positions controlling flow through the channel. In one embodiment, the actuator can be threaded into at least a portion of the structure, and can be moved rotationally between a first position, causing relatively greater constriction of a microfluidic fluid path, and a second position causing relatively lesser constriction of the fluid path. Actuating the actuator, e.g., by rotation, can deform material between the valve and the fluid path, thereby constricting at least a portion of the underlying fluid path and regulating the flow of a fluid in the fluid path. In another aspect, the invention provides a reservoir into which fluid can be placed and from which fluid can be introduced into a microfluidic system. In one embodiment, the reservoir is expandable and thereby able to store fluid under pressure for delivery to a microfluidic system.