Abstract:
Two piezoelectric sensors (78, 80) are mounted on the back of a spring-plate (14) of a mechanical resonance scanner (10) on respective sides of a center line coinciding with an axis of rotation (16). As the scanner mirror (12) rotates back and forth the two sensors are accelerated and decelerated at a 180 DEG phase difference. Each sensor's output voltage crosses a zero level when the acceleration is unchanging. A differential amplifier (88) detects the zero-crossings for motion along the axis of rotation. Common mode rejection eliminates the non-rotational accelerations associated with external vibrations and shocks, and prevents masking the mirror's zero-crossings.
Abstract:
This invention provides an extraction device and method for extracting desired particles from a sample stream (2) containing the desired particles. The device comprises a sample stream inlet (1); an extraction stream inlet (5); an extraction channel (7) in fluid communication with the sample stream inlet (1) and the extraction stream inlet (5) for receiving a sample stream (2) from the sample stream inlet (1) in adjacent laminar flow with an extraction stream (4) from the extraction stream inlet (5); a sequestering material within the extraction channel (7) for capturing desired particles (18) in the extraction stream (9); a by-product stream outlet (15) in fluid communication with the extraction channel (7) for receiving a by-product stream (12) comprising at least a portion of the sample stream (2) from which desired particles (18) have been extracted; and a product outlet (14) in fluid communication with the extraction channel (7) for receiving a product comprising the sequestering material and at least a portion of the desired particles (18).
Abstract:
Methods for inducing bone formation using ob protein are disclosed. The methods can be used for treating osteoporosis, repairing fractures, dental defects, resectioning due to oncogenesis and elongation of the growth plate/long bone. In addition, the methods can be used for ex vivo therapy and reinfused into a mammal.
Abstract:
A display device (10) is achieved using an optical system which generates an expanded exit pupil (21) without compromising magnification or resolution. Modulated light from a source (12) is converged toward a focal point by an optics subsystem (14). A scanning subsystem (16) deflects the converging light, and thus the focal point, along a raster pattern to define a curved intermediate image plane (15). An exit pupil expanding apparatus (18) defines a curved surface which coincides with the curved image plane (15). Impinging light rays at a given instant in time span a given incidence angle ( theta i). Exiting light rays span a larger angle ( theta o). The exiting light spans a larger surface area of an ensuing eyepiece (20). In turn an expanded exit pupil (21) occurs beyond the eyepiece. Exit pupil expanding embodiments include a curved diffractive optical element (300), fiber optic face plate (320), lens array (340) and diffuser (360). The diffractive optical element generates multiple exit pupils (304-316), while the other embodiments generate enlarged exit pupils.
Abstract:
The present invention provides a method and apparatus for rapid measurements of a fluid bulk analyte, requiring only microscale volumes. Several fluid bulk analytes can be measured simultaneously and, for biological samples, the cell content can also be measured simultaneously. The invention comprises reporter beads for chemical analysis of fluid bulk properties such as pH, oxygen saturation and ion content. Each reporter bead comprises a substrate bead having a plurality of at least one type of fluorescent reporter molecules immobilized thereon. The fluorescent properties of the reporter bead are sensitive to a corresponding analyte. Reporter beads are added to a fluid sample and the analyte concentration is determined by measuring fluorescence of individual beads, for example in a flow cytometer. Alternatively, reporter molecules which change absorbance as a function of analyte concentration can be employed.
Abstract:
A mammalian islet cell antigen polypeptide involved in the development of insulin-dependent diabetes mellitus (IDDM) is disclosed. This islet cell antigen polypeptide, 1851, was found to contain regions of homology to the protein-tyrosine phosphatase family. Methods for diagnosis and treatment, including use in immunoprecipitation assays and the induction of immune tolerance using the recombinant mammalian polypeptides and antibodies specific to mammalian islet cell antigen 1851 polypeptides are presented.
Abstract:
The present invention provides a flow cytometer made of two components: a flow cytometer optical head and a disposable flow module. The flow module utilizes a V-groove flow channel micromachined in a silicon wafer. The optical head comprises a laser to provide an illuminating beam and small and large angle photodetectors. Anisotropically etched facets of the V-groove reflect the illuminating beam. Small angle scattered light is also reflected by the V-groove wall and is collected by the small angle photodetector. Large angle scattered light and fluorescent light can exit the channel without reflection and are collected by the large angle photodetector. In addition, fluorescent light can be back-reflected by the V-groove, which enhances the collection efficiency. This invention further includes a method of analyzing a particle-containing fluid and a method of measuring the velocity of a particle in a fluid flow.
Abstract:
Methods for inhibiting Factor XIII activity feature a ligand that forms at least one contact, at a distance of about 5 ANGSTROM or less, with at least one amino acid residue of a Factor XIII monomer. Factor XIII inhibitors are selected or designed using the three-dimensional structure of Factor XIII as a guide. In one approach, inhibitory ligands are selected or designed based on the Factor XIII b-sandwich:core interface. In a second approach, inhibitors are selected or designed based on the catalytic site of Factor XIII. In a third approach, inhibitory ligands are selected or designed based on the Factor XIII dimer interface. In a fourth approach, inhibitory molecules were designed to occupy the Factor XIII binding site, and include an electrophilic moiety susceptible to nucleophilic displacement by the reactive Cys-314.