Abstract:
A micromechanical memory sensor includes a latch member assembly (20, 30) mechanically latching upon detection of a threshold value of a variable condition (ambient temperature, acceleration, pressure). The mechanical latching is detected by circuitry of a readout mechanism (21, 22). The sensor further includes a resetting mechanism such as a thermal resistor (24), proof mass (52, 101) or electrostatic combing drive (170, 175) for electrically unlatching the latch member assembly whereby the sensor is latched purely mechanically in its operative states and is electrically reset for repeat use.
Abstract:
Triblock polymers comprised of polysaccharide, such as heparin or dextran, and a hydrocarbon chain, have been prepared. The triblock polymer adsorbs strongly on the surface of hydrophobic polymer substrates such as polyethylene, through hydrophobic interaction between the polymer and the hydrophobic hydrocarbon chain of the triblock polymer. The surface adsorbed with triblock polymer is resistant to protein deposition, which renders the surface nonthrombogenic.
Abstract:
The present invention provides a method for surface modifying a substrate, such as an implant, to provide the substrate with anticoagulant activity and resistance to the deposition of plasma proteins; and the resulting substrate. The surface of the substrate is modified by first depositing a film of a plasma polymer such as plasma polymerized N-vinyl-2-pyrrolidone or allyl alcohol on the surface of the substrate. Optionally, a neutral hydrophilic spacer molecule is attached to the plasma polymer. An anticoagulant, such as heparin, is attached either directly to the substrate or indirectly to the substrate via attatchment to the spacer molecule, when such spacer molecule is present.
Abstract:
A new neurotrophic factor named herein neurotrophin-4 or NT-4 is disclosed. The neurotrophic factor was deduced from the screening of frog genomic DNA by polymerase chain reaction (PCR) with primers to conserved amino acid sequences in nerve growth factor (NGF) and brain-derived neurotrophic factor (BDNF). The new neurotrophic factor is believed to be distinct as it exhibits limited structural homology with any of the known neurotrophic factors. DNA sequences encoding NT-4, methods for their production and the production of recombinant DNA molecules, and both diagnostic and therapeutic methods and materials are disclosed.
Abstract:
The present invention is directed to a process for synthesizing hydroxylated plasma-polymerized films, as well as the hydroxylated plasma-polymerized films produced by the process of the invention. In addition, the present invention is directed to the use of hydroxylated plasma-polymerized films produced by the process of the invention for enhancing the compatibility and/or implantability of biomedical implants and/or devices.