Carrier Is Particulate And The Particles Are Of Intentionally Different Sizes Or Impregnated Differently With The Immunochemicals Patents (Class 436/523)
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Patent number: 7091050Abstract: The present invention provides an improved system for detecting the presence or level of an analyte in a sample. In “competition-like” assays of the present invention, a sample including an analyte is mixed with a second ligand to which the analyte binds, and the mixture is exposed to a solid phase containing a first ligand that can compete with the analyte for binding to the second ligand. According to the present invention, the time of exposure of the mixture to the solid phase is limited so that substantially no dissociation of analyte/second ligand complex occurs. The competition-like assays of the present invention are preferably performed with a solid phase containing a substantial excess of first ligand. In “sandwich-type” assays of the present invention, a sample including an analyte is contacted with a solid phase including a first ligand that binds the analyte and, simultaneously or subsequently, is contacted with a second ligand that binds the analyte (or the analyte/first ligand complex).Type: GrantFiled: October 22, 2003Date of Patent: August 15, 2006Assignee: Sapidyne Instruments Inc.Inventors: Steve J. Lackie, Thomas R. Glass
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Patent number: 7079241Abstract: Devices, systems, kits, and methods for detecting and/or identifying a plurality of spectrally labeled bodies well-suited for performing multiplexed assays. By spectrally labeling the beads with materials which generate identifiable spectra, a plurality of beads may be identified within the fluid. Reading of the beads is facilitated by restraining the beads in arrays, and/or using a focused laser.Type: GrantFiled: April 5, 2001Date of Patent: July 18, 2006Assignee: Invitrogen Corp.Inventors: Stephen A. Empedocles, Andrew R. Watson, Jian Jin
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Patent number: 7049151Abstract: A method and kit for simultaneous detection and/or determination of a plurality of modified proteins in a sample. The method comprises: a) contacting the sample under mild protein denaturation conditions with a plurality of first antibodies capable of binding to a specific target protein, the first antibodies being immobilized on solid support material, each first antibody being differentiable from others by a differentiation parameter, whereby the first antibodies bind to respective target proteins present in the sample; b) removing unbound materials from the locus of the first antibodies; c) contacting the materials from step (b) with one or more second antibodies, each of which is specific to a class or subclass of modified proteins or with a plurality of second antibodies, each of which is specific to a modified protein, so as to bind the second antibody or antibodies to modified proteins in the sample; and d) detecting and/or determining a plurality of modified proteins in the sample.Type: GrantFiled: March 6, 2002Date of Patent: May 23, 2006Assignee: Bio-Rad Laboratories, Inc.Inventors: Quan Nguyen, Yong Song
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Patent number: 7045363Abstract: A nucleic acid-bound polypeptide produced by binding a nucleic acid to a polypeptide, a method of producing the nucleic acid-bound polypeptide, and applications of the nucleic acid-bound polypeptide, including immunoassays for an antigen or antibody, such as an agglutination immunoassay are provided.Type: GrantFiled: May 7, 1999Date of Patent: May 16, 2006Assignee: Fujirebio Inc.Inventors: Fuminori Takemura, Eiichi Ueno, Satoru Itoh
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Patent number: 7022529Abstract: Methods, compositions and kits are disclosed. The compositions are light emitting and comprise a polymeric matrix having dissolved therein a photoactive compound. The composition has the characteristic that, after activation of the photoactive compound, the rate of decrease in the intensity of light emission at any time during a 20-fold decrease in the intensity is proportional to the intensity of the light emission. In one embodiment the polymeric matrix is comprised of particles of about 20 nm to about 100 ?m in diameter to which is bound a specific binding pair member. The particles generally comprise a polymeric matrix having dissolved therein about 1 to about 20% by weight of a dopant. The compositions may be used in methods for determining an analyte. A combination is provided comprising (1) a medium suspected of containing the analyte, (2) and the aforementioned composition. The photoactive substance is activated and the effect of the activating on the optical properties of the combination is detected.Type: GrantFiled: December 24, 2003Date of Patent: April 4, 2006Assignee: Dade Behring Marburg GmbHInventors: Sharat Singh, John S. Pease, Jacqueline Sadakian, Daniel B. Wagner, Edwin F. Ullman
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Patent number: 6991907Abstract: Antibodies and methods are described for the detection and quantitation of cardiac specific troponin I in samples. Cardiac-specific troponin isoforms exist in various forms in the blood, including free and complexed forms. By selecting antibodies that are insensitive and/or sensitive to these various forms, the present invention can provide immunoassays that more accurately reflect the clinical state of an individual. These described antibodies and methods can be used for providing indicators of myocardial infarction and other cardiac pathologies.Type: GrantFiled: October 12, 2000Date of Patent: January 31, 2006Assignee: Biosite, Inc.Inventors: Kenneth F. Buechler, Paul H. McPherson
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Patent number: 6974704Abstract: Rapid mass spectrometric immunoassay methods for detecting and/or quantifying antibody and antigen analytes utilizing affinity capture to isolate the analytes and internal reference species (for quantification) followed by mass spectrometric analysis of the isolated analyte/internal reference species. Quantification is obtained by normalizing and calibrating obtained mass spectrum against the mass spectrum obtained for an antibody/antigen of known concentration.Type: GrantFiled: March 14, 2001Date of Patent: December 13, 2005Assignee: Intrinsic Bioprobes, Inc.Inventors: Randall W. Nelson, Peter Williams, Jennifer Reeve Krone
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Patent number: 6960478Abstract: Heterogeneous assays for different analytes in a single biological sample are performed simultaneously in a multiplexed assay that combines flow cytometry with the use of magnetic particles as the solid phase and yields an individual result for each analyte. The particles are distinguishable from each other by characteristics that permit them to be differentiated into groups, each group carrying an assay reagent bonded to the particle surface that is distinct from the assay reagents of particles in other groups. The magnetic particles facilitate separation of the solid and liquid phases, permitting the assays to be performed by automated equipment. Assays are also disclosed for the simultaneous detection of antibodies of different classes and a common antigen specificity or of a common class and different antigen specificities.Type: GrantFiled: December 11, 2003Date of Patent: November 1, 2005Assignee: Bio-Red Laboratories, Inc.Inventors: Michael I. Watkins, Richard B. Edwards
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Patent number: 6955889Abstract: Simultaneous forward and reverse blood group testing is described using both a visual detection system and a fluorescent based labeling and detection system. Forward and reverse tests could be performed separately, but A and B agglutinates can be detected and discriminated simultaneously.Type: GrantFiled: June 1, 2000Date of Patent: October 18, 2005Assignee: Ortho-Clinical Diagnostics, Inc.Inventors: Thomas J. Mercolino, Kathleen J. Reis
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Patent number: 6951682Abstract: Articles comprising substantially uniform porous coatings, which may be photopatterned, are provided. The use of such porous coatings increases the surface density of attached compounds within, for example, ligand arrays prepared by methods such as regionally selective solid-phase chemical synthesis. Arrays prepared using the porous coatings may be used within a variety of diagnostic and drug discovery assays.Type: GrantFiled: September 17, 1999Date of Patent: October 4, 2005Assignee: Syntrix Biochip, Inc.Inventor: John A. Zebala
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Patent number: 6951716Abstract: Immunoassay methods and apparatus are provided which utilize flow cytometry, coated latex microspheres, and fluorochrome labeled antibodies, to simultaneously detect the presence and amount of one or more analytes in a sample. Beads of several different sizes, colors or shapes, each bead are coated with a different analyte, for the simultaneous detection of one or more analytes and of cell components. The invention is also directed to platelet Ig positive control reagents and assays which provide for the setting of the fluorescence positive region for each patient. The platelet control is sized to fit between the platelets and red cells and thus making it ideal as a true biological control.Type: GrantFiled: June 6, 2002Date of Patent: October 4, 2005Inventor: Mark Hechinger
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Patent number: 6939720Abstract: A method for the multiplexed diagnostic and genetic analysis of enzymes, DNA fragments, antibodies, and other biomolecules comprises the steps of constructing an appropriately labeled beadset, exposing the beadset to a clinical sample, and analyzing the combined sample/beadset by flow cytometry. Flow cytometric measurements are used to classify, in real-time, beads within an exposed beadset and textual explanations, based on the accumulated data obtained during real-time analysis, are generated for the user. The inventive technology enables the simultaneous, and automated, detection and interpretation of multiple biomolecules or DNA sequences in real-time while also reducing the cost of performing diagnostic and genetic assays.Type: GrantFiled: December 27, 2002Date of Patent: September 6, 2005Assignee: Luminex CorporationInventors: Van S. Chandler, R. Jerrold Fulton, Mark B. Chandler
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Patent number: 6939678Abstract: Assay systems and specialized antibodies for the detection and quantitation of troponin I and troponin T in body fluids as an indicator of myocardial infarction. Since troponin I and T exist in various conformations in the blood, the ratios of the monomeric troponin I an T and the binary and ternary complexes, as well as which form of troponin present in the blood, may be related to the metabolic state of the heart. Disclosed is a system to determine the presence of a troponin form or a group of troponin forms in a sample of whole blood, serum or plasma. Disclosed is a stabilized composition of troponin; the stabilized composition can comprise a stabilized composition of troponin I, wherein the troponin I is oxidized, the troponin I can be unbound or the troponin I can be in a complex. Disclosed is a method for improving the recovery of troponin I or T from a surface used in immunoassays.Type: GrantFiled: July 7, 1999Date of Patent: September 6, 2005Assignee: Biosite, Inc.Inventors: Kenneth F. Buechler, Paul H. McPherson
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Patent number: 6939681Abstract: The invention relates to a method of evaluating the immunological status of a subject comprising the steps of 1) determining the content of an antibody in a liquid sample from the subject using an immunoassay, wherein the reaction between the antibody of the sample and a ligand in the form of an antigen, an antibody or a hapten, the ligand being directed to the Fab region of the sample antibody, is carried out in the presence of other constituents of the sample to obtain a measurement 1, 2) determining the content of an antibody in the liquid sample using an immunoassay, wherein the reaction between the antibody of the sample and a ligand in the form of an antigen, an antibody or a hapten, the ligand being directed to the Fab region of the sample antibody, is carried out in the absence of other constituents of the sample to obtain a measurement 2, and 3) interrelating measurements 1 and 2 to express the interference and using the interference as a parameter for evaluating the immunological status of the subjeType: GrantFiled: February 28, 2002Date of Patent: September 6, 2005Assignee: Alk-Abello A/SInventors: Hans-Henrik Ipsen, Niels Johansen, Rikke Morkeberg, Soren Bogestrand, Tine Charlotte Beck
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Patent number: 6933106Abstract: Immunoassay methods and apparatus are provided which utilize flow cytometry, coated latex microspheres, and fluorochrome labeled antibodies, to simultaneously detect the presence and amount of one or more analytes in a sample. By combining FALS and fluorescence, it is practical to use beads of several different sizes, colors or shapes, each bead coated with a different analyte, for the simultaneous detection of one or more analytes and of cell components such as platelets in a sample.Type: GrantFiled: September 13, 2002Date of Patent: August 23, 2005Inventor: Mark Hechinger
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Patent number: 6929955Abstract: The present invention relates to an interactive system comprising at least one active surface of plastic from monomers containing at least one structural element derived from a carbon dioxide (A), and at least one substance associated to a linker with at least one structural element (B) capable of establishing a hydrogen bond, and involving an interaction between the structural elements (A) and (B). That interactive system is suitable for presenting and eliminating substances in liquids.Type: GrantFiled: October 14, 1999Date of Patent: August 16, 2005Assignee: Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V., BerlinInventors: Elke Bucha, Götz Nowak
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Patent number: 6916661Abstract: This invention provides a novel fluorescent particle including a core or carrier particle having on its surface a plurality of smaller polymeric particles or nanoparticles, which are stained with different fluorescent dyes. When excited by a light source they are capable of giving off multiple fluorescent emissions simultaneously, which is useful for multiplexed analysis of a plurality of analytes in a sample. The coupled complex particles carrying on their surface fluorescent nanoparticles, methods of preparing such polymer particles, and various applications and methods of using such particles are claimed.Type: GrantFiled: October 28, 2003Date of Patent: July 12, 2005Assignee: Luminex CorporationInventors: Mark B. Chandler, Don J. Chandler
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Patent number: 6913935Abstract: A method for the assay of N samples each containing a compound to be tested, comprises providing N reaction vessels each containing a population of carrier beads and other reagents for performing the assay, where N is at least 2 e.g. 80-4000. Each population of carrier beads is distinguishable from every other population. After adding the samples to the reaction vessels and performing the assays, the contents of all the reaction vessels are mixed and subjected to analysis by flow cytometry. By means of flow cytometry, each carrier bead is rapidly analysed to identify its population and also to determine the presence or concentration or biological activity of the compound to be tested.Type: GrantFiled: December 3, 1998Date of Patent: July 5, 2005Assignee: Amersham Biosciences UK LimitedInventor: Nicholas Thomas
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Patent number: 6911178Abstract: Disclosed are novel protein and peptide compositions comprising soluble and bound forms of immunologically-active blood group antigens including mammalian Rh antigens. In preferred embodiments methods for the isolation and purification of serologically-active human Rh antigens such as D, c, C, E, and e are disclosed. Also disclosed are methods for the adsorption of immunologically-active Rh antigens to solid supports. Diagnostic kits, methods, and devices for the detection of Rh antibodies in clinical and non-clinical samples are also disclosed. Devices, compositions and methods for the isolation, purification and quantitation of anti-Rh antibodies from solution are also provided.Type: GrantFiled: November 14, 2001Date of Patent: June 28, 2005Assignees: Board of Regents, The University of Texas System, Baylor College of MedicineInventors: L. Scott Rodkey, Marwan A. Yared, Kenneth J. Moise, Jr.
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Patent number: 6911315Abstract: A method for analyzing blood enables one to isolate, detect, enumerate and confirm under magnification the presence of target cells which have expressed surface epitopes that indicate intracellular infection by various viruses or other infectious agents, and also cells which have expressed surface epitopes that indicate the presence of non-infectious medical conditions. The analysis involves the examination of cells in the blood sample for the presence or absence of particular surface epitopes while the blood sample is disposed in a centrifuged blood sampling container. The epitopic analysis for the presence or absence of infected cells, or cells which indicate the presence of non-infectious medical conditions relies on the detection of known target expressed epitopes. The target epitopes on the target cell types are epitopes which are also known to be absent on normal circulating cells in the blood.Type: GrantFiled: January 10, 2002Date of Patent: June 28, 2005Inventors: David L. Rimm, Paul Fiedler, Robert A. Levine, Stephen C. Wardlaw
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Patent number: 6908770Abstract: A system for the rapid characterization of multi-analyte fluids, in one embodiment, includes a light source, a sensor array, and a detector. The sensor array is formed from a supporting member into which a plurality of cavities may be formed. A series of chemically sensitive particles are, in one embodiment positioned within the cavities. The particles may be configured to produce a signal when a receptor coupled to the particle interacts with the analyte. Using pattern recognition techniques, the analytes within a multi-analyte fluid may be characterized.Type: GrantFiled: April 7, 1999Date of Patent: June 21, 2005Assignee: Board of Regents, The University of Texas SystemInventors: John T. McDevitt, Eric V. Anslyn, Jason B. Shear, Dean P. Neikirk
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Patent number: 6905881Abstract: The present invention provides a test plate and methods for adjusting fluorescence imaging systems involving using a plate with fluorescent microbeads bound to a surface.Type: GrantFiled: November 30, 2001Date of Patent: June 14, 2005Inventors: Paul Sammak, Gustavo Rosania, Lawrence J. Zana, Kim Ippolito, Jason Bush, Alex Friedman, Sarah Burroughs Tencza, Ravi Kapur
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Patent number: 6900019Abstract: This invention provides a simple and convenient, single stage, single vessel cell extraction and assay method which is suitable for the extraction and measurement of a range of different types of analyte which occur as cellular components. The invention also provides kits of reagents suitable for performing cellular extraction and measurement as a single stage, single vessel process.Type: GrantFiled: February 23, 1998Date of Patent: May 31, 2005Assignee: Amersham Biosciences UK LimitedInventor: Jeffrey Kenneth Horton
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Patent number: 6893881Abstract: The invention relates to a method for detecting specific target-cells in a simple and time saving way, using paramagnetic particles, antibodies recognizing the Fc portions of target-cell associating antibodies and target-cell associating antibodies directed to specific antigen determinants in the target-cell membranes. Incubation of the cell suspension with a mild detergent and/or second set of antibodies or antibody fragments, prelabeled or not with fluorescent agents, metallocolloids, radioisotopes, biotincomplexes or certain enzymes allowing visualization, with dramatically increase the specificity of the method. The method can further be used for isolation of the target-cells by magnetic field application and kit for performing the method according to the invention is described.Type: GrantFiled: September 10, 1993Date of Patent: May 17, 2005Assignee: Abbott Laboratories, Inc.Inventors: Øystein Fodstad, Gunnar Kvalheim
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Patent number: 6890764Abstract: Described herein are assays and components for encoding and decoding microspheres. Each assay or component described utilizes at least one nanocrystal.Type: GrantFiled: December 31, 2002Date of Patent: May 10, 2005Assignee: Illumina, Inc.Inventors: Mark S. Chee, Steven M. Barnard, Chanfeng Zhao
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Patent number: 6887712Abstract: A method is disclosed for determining whether a compound binds to a lipoprotein such as LDL or VLDL in a manner which will lower plasma cholesterol. The method provided includes assessing the ability of the compound to form a complex with the lipoprotein, and then determining whether the newly formed complex causes a change in the structure of apoB-100 that results in increased binding affinity to an LDL receptor.Type: GrantFiled: November 9, 1999Date of Patent: May 3, 2005Assignee: AtheroGenics, Inc.Inventors: Russell M. Medford, Uday Saxena
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Patent number: 6881586Abstract: This invention provides methods of retentate chromatography for resolving analytes in a sample. The methods involve adsorbing the analytes to a substrate under a plurality of different selectivity conditions, and detecting the analytes retained on the substrate by desorption spectrometry. The methods are useful in biology and medicine, including clinical diagnostics and drug discovery.Type: GrantFiled: April 30, 2002Date of Patent: April 19, 2005Assignee: Ciphergen Biosystems, Inc.Inventors: T. William Hutchens, Tai-Tung Yip
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Patent number: 6872578Abstract: Heterogeneous assays for different analytes in a single biological sample are performed simultaneously in a multiplexed assay that combines flow cytometry with the use of magnetic particles as the solid phase and yields an individual result for each analyte. The particles are distinguishable from each other by characteristics that permit them to be differentiated into groups, each group carrying an assay reagent bonded to the particle surface that is distinct from the assay reagents of particles in other groups. The magnetic particles facilitate separation of the solid and liquid phases, permitting the assays to be performed by automated equipment. Assays are also disclosed for the simultaneous detection of antibodies of different classes and a common antigen specificity or of a common class and different antigen specificities.Type: GrantFiled: July 13, 2001Date of Patent: March 29, 2005Assignee: Bio-Rad Laboratories, Inc.Inventors: Michael I. Watkins, Richard B. Edwards
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Patent number: 6872577Abstract: An agglutination assay method for quantitatively determination of an analyte in a liquid sample using particles bearing an anti-analyte. A non-fluid substance which retains the particles while suppressing the diffusion of the particles therein is used as a medium which is to be a place where the agglutination of the particles takes place. Upon analysis, a solation agent is added to the non-fluid substance medium to increase the fluidity of the non-fluid substance, thereby the particles bearing the anti-analyte can diffuse in the medium to cause the agglutination with the analyte. Preferably, the solation agent is added to the non-fluid medium together with the sample. The non-fluid substance medium containing the particle-labeled anti-analyte can be stored with a higher stability in the dry state. A dry analysis element for enabling such analysis method is also provided.Type: GrantFiled: October 22, 2001Date of Patent: March 29, 2005Assignee: Fuji Photo Film Co., Ltd.Inventors: Hiroshi Shinoki, Yoshikazu Amano
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Patent number: 6855263Abstract: A method for rapid purification of a blood component from blood is described in which the blood plasma is first separated from the cellular blood elements by any conventional means, such as centrifugation. An affinity cartridge is then activated with a molecule, such as an amino acid, which binds with a blood component such as plasminogen. The separated blood plasma is then passed through the affinity cartridge such that the blood component is retained by the affinity cartridge. Thereafter, the blood component is eluted from the affinity cartridge by passing a buffer solution containing a releasing agent through the affinity cartridge. This releasing agent disengages the blood component from the affinity cartridge. The releasing agent is then separated from the eluted solution by passing the eluted solution through a device, such as an ion exchange, gel filter, or size exclusion device. The isolated plasminogen solution is then concentrated by a factor of from 2 to 10. The separated blood component, e.g.Type: GrantFiled: July 23, 2002Date of Patent: February 15, 2005Assignee: Nuvue Technologies, Inc.Inventors: Michael T. Trese, George A. Williams, Michael K. Hartzer, Wendelin A. Dailey, Craig J. Bell
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Patent number: 6855562Abstract: The present invention provides an immunoassay method in which blood can be measured even without pretreatment by means of a centrifuge etc. In the present invention, antibodies or antigens in a sample are subjected to agglutination reaction with insoluble carriers onto which antigens or antibodies specifically reacting with the antibodies or antigens in the sample have been immobilized and the resulting agglutination mixture is determined for the change in its absorbance or in its scattered light by irradiation with light, wherein said sample is whole blood and the whole blood is forcibly lyzed.Type: GrantFiled: February 24, 2000Date of Patent: February 15, 2005Assignee: Horiba, Ltd.Inventors: Yasuo Yamao, Narihiro Oku
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Patent number: 6855551Abstract: The present invention provides a composition comprising fluorescent semiconductor nanocrystals associated to a compound, wherein the nanocrystals have a characteristic spectral emission, wherein said spectral emission is tunable to a desired wavelength by controlling the size of the nanocrystal, and wherein said emission provides information about a biological state or event.Type: GrantFiled: April 12, 2001Date of Patent: February 15, 2005Assignee: Massachusetts Institute of TechnologyInventors: Moungi G. Bawendi, Vikram C. Sundar, Frederic V. Mikulec
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Patent number: 6852547Abstract: A method for measuring low levels of a substance in a sample includes the formation of a rotor from paramagnetic particles in a substantially uniform magnetic field. The rotor is rotated by rotating the substantially uniform magnetic field. A portion of the substance in a sample is bound to the paramagnetic particles, and a signal having a time-varying component is detected. The signal is then processed using a lock-in amplifier with a reference signal having a frequency twice that of the rotation of the magnetic field. This improves the signal-to-noise ratio of the time-varying component of the signal.Type: GrantFiled: August 1, 2003Date of Patent: February 8, 2005Assignee: Arizona Board of RegentsInventors: Antonio A. Garcia, Mark Hayes, Anil Vuppu, Karl Booksh
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Patent number: 6833275Abstract: A composition which contains stabilized conjugates composed of colloidal particles and biomolecules is obtained by adding a detergent to a solution containing biomolecules before or/and during treatment of colloidal particles with this solution.Type: GrantFiled: August 7, 2000Date of Patent: December 21, 2004Assignee: Roche Diagnostics GmbHInventor: Alfons Nichtl
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Patent number: 6828158Abstract: Reagents and the use of the reagents in a microparticle light scattering agglutination assay are disclosed. The reagents comprise a mixture of particles having relatively stronger light scattering properties and particles having relatively weak light scattering properties with respect to one another. The particles having strong light scattering properties carry a binding partner of high reactivity with the analyte. The particles having weak light scattering properties carry a binding partner of low reactivity with the analyte.Type: GrantFiled: April 6, 2001Date of Patent: December 7, 2004Assignee: Roche Diagnostics CorporationInventors: Shinichi Eda, Jörg Heinrich Kaufmann, Stefan Pohl
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Patent number: 6828157Abstract: A method of single parameter and multiparameter characterizing of cells, particularly immunophenotyping of cells, is provided. The method preferably uses antibody coated microspheres which are adapted to bind to specific types of cells. One or more sets of coated microspheres are added simultaneously or sequentially to a suspension of cells and bind the cells they are adapted to bind. Cells may bind to one or more microspheres. The suspension is then filtered to trap bead-cell complexes. The complexes are preferably stained and then examined to characterize the cells, preferably the cells bound to the microspheres. A kit and apparatus for performing the method are also provided.Type: GrantFiled: May 3, 2000Date of Patent: December 7, 2004Inventor: Dan A. Pankowsky
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Patent number: 6815217Abstract: A solid phase with at least one test area is described which contains reagents for the detection of at least one analyte in a sample, wherein the solid phase additionally comprises at least one control area for the detection of interfering reactions.Type: GrantFiled: January 21, 2000Date of Patent: November 9, 2004Assignee: Roche Diagnostics GmbHInventors: Johann Karl, Helmut Lenz, Friedemann Krause, Peter Finckh, Hans Hornauer, Johann Berger
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Patent number: 6811969Abstract: This invention provides methods of retentate chromatography for resolving analytes in a sample. The methods involve adsorbing the analytes to a substrate under a plurality of different selectivity conditions, and detecting the analytes retained on the substrate by desorption spectrometry. The methods are useful in biology and medicine, including clinical diagnostics and drug discovery.Type: GrantFiled: June 23, 2000Date of Patent: November 2, 2004Assignee: Ciphergen Biosystems, Inc.Inventors: T. William Hutchens, Tai-Tung Yip
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Publication number: 20040171077Abstract: The present invention provides a method for separation of a particulate matrix from a solution while reducing loss of particles during separation steps. Methods are also disclosed for isolation of molecules of interest using affinity particles or beads, wherein at least one step of the isolation is conducted in the presence of a detergent. The presence of detergent reduces the loss of matrix particles and enhances reproducibility and yield of the molecule of interest. The invention makes possible the manual and automated processing of affinity beads, especially magnetic beads, in multi-well as well as single-well vessels with significantly reduced bead loss, as compared with similar processes conducted in the absence of detergent.Type: ApplicationFiled: February 27, 2004Publication date: September 2, 2004Inventors: Helge Lubenow, Kerstin Steinert, Roland Fabis, Joachim Ribbe, Melanie Emmerlich
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Publication number: 20040166595Abstract: An analyte detection system utilizing a combination of fluorescent labels for labeling particles and an analyte specific fluorescent analyte detection dye. The particles contain a combination of fluorescent labels for coding the particles and an analyte specific fluorescent dye. The particles can be used to identify and quantify analytes in an analytical sample by reaction of the analytical sample with the particles. An analytical device can identify the particles according to the combination of fluorescent labels. The device can then correlate the identified particle with the analyte specific fluorescent analyte detection dye. Multiple subpopulations of particles can be used to identify and quantify multi-analytes in a single analytical sample. Near infrared (NIR) fluorescent labels useful in the detection system are also provided.Type: ApplicationFiled: February 12, 2004Publication date: August 26, 2004Inventors: Michael L. Bell, Yuan Lin, Josephine M. Michael, Stephen L. Pentoney, Tsong-Tseh Tsay
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Patent number: 6780581Abstract: A method for the production of a product containing a quantum of bioparticles, for example bacterial cells, is provided, as are products obtained thereby. In one embodiment, the products contain a defined quantum of bioparticles, preferably presented in a viable state. Products made in accordance with the invention may be usefully put to applications where having knowledge of the number of bioparticles present may be important or at least advantageous.Type: GrantFiled: September 12, 2001Date of Patent: August 24, 2004Assignee: BTF Pty LtdInventors: Graham Vesey, Mark Gauci
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Patent number: 6770488Abstract: A colloidal system for detection of a variety of analytes involves techniques which permit reconstitution of a desiccated substance such as for surface enhanced Raman spectroscopic analysis and multiple sensors at once, each having different spectra through the use of markers or the like. Competitive assay techniques and a variety of substances are explained to permit a practical an versatile system which can also be used for immunological assays and can include antibodies tagged to provide spectroscopic indicia.Type: GrantFiled: March 16, 2000Date of Patent: August 3, 2004Assignee: The University of WyomingInventors: Keith T. Carron, Robert C. Corcoran, Roberta Ann Sulk
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Publication number: 20040126773Abstract: Assay systems that sense assay conditions using coded sensor particles.Type: ApplicationFiled: May 23, 2003Publication date: July 1, 2004Inventors: Oren E. Beske, Simon Goldbard
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Publication number: 20040126901Abstract: Compositions and methods which permit effective use of multiplexed particles of dimensions less than the resolution of the detector are useful in assessing the spatial pattern of targets or substructures within a specific environment.Type: ApplicationFiled: October 7, 2003Publication date: July 1, 2004Inventors: Lawrence M. Kauvar, William D. Harriman
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Publication number: 20040126797Abstract: The present invention relates to a micro-array system and the uses thereof. Particularly, the micro-array system is for a micro amount of biomolecules carrying on a bioreaction in a reaction solution, which comprises a substrate comprising a plurality of micro-wells for receiving the reaction solution; a plurality of micro-beads placing in the reaction solution for the biomolecules attached on surfaces thereon; and a vibrating module for vibrating the substrate, which makes the biomolecules attached on the micro-beads react evenly. Optionally, the micro-array system further comprises a temperature control module for controlling the temperature of the reaction solution. The bioreaction performed in the micro-array system according to the invention has the advantages of having a high sensitivity, being easily post-manipulated, being easily operated, having a high reliability and being reusable.Type: ApplicationFiled: October 21, 2003Publication date: July 1, 2004Applicants: NATIONAL TSING-HUA UNIVERSITY, STANFORD UNIVERSITYInventors: Chih-Ying Hsu, Tzong-Hsiung Hseu, Ruey-Shing Huang, David R. Cox, Chien-ming Wu, Jiann Heng Chen, Min-Lung Tsai, Ming-Tsong Lai, Yong-Li Pan, Tai-ching Fan
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Publication number: 20040126900Abstract: The present invention is directed to polymeric nanoparticles functionalized with two or more peptide moieties that possess high affinity to biomolecular targets, the peptide moieties being covalently linked to the nanoparticle polymeric core structure, either directly or via a linker molecule. The invention is further directed to methods of synthesizing these polymeric nanoparticles and to the various applications for which they may be used.Type: ApplicationFiled: May 5, 2003Publication date: July 1, 2004Inventors: Stephen E Barry, Andrew A Goodwin, Dominic Casenas, Kevin Lindquist, Rachel Decor
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Patent number: 6753189Abstract: A catcher, having an immunological epitope, is fixed to a detection zone of a spreading layer. A marker, capable of easy detection, has an inmmunological epitope. The marker and bispecific antibodies are soluble so that they can move on the spreading layer. The bispecific antibodies include a first bispecific antibody, having specificity for the detectable material in the fluid sample and the marker, and a second bispecific antibody, having specificity for the detectable material in the fluid sample and the catcher. Pore sizes and particle diameters are set so that the reaction product in which the marking elements and the particles are bonded are caught at a catching section. The concentration of the marking elements and the particles are increased to improve detection sensitivity. The result is an inexpensive and simple detection apparatus being highly-sensitive for the immunological detection of a detectable material, without wasting valuable antibodies.Type: GrantFiled: June 3, 1999Date of Patent: June 22, 2004Assignee: Mizuho Medy Co., Ltd.Inventors: Kenji Narahara, Toshiyuki Uehara
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Patent number: 6753190Abstract: The present invention relates to an immunological detection method capable of performing detection of an analyte in a test sample, and a kit used therefor. There is provided an immunological detection method for detecting an analyte by using a water-absorbent substrate in which a capture region is positioned in a given region on a surface thereof, the capture region being immobilized with a first immunochemical component capable of specifically binding to the analyte, wherein the detection signal is amplified and a kit used therefor.Type: GrantFiled: February 29, 2000Date of Patent: June 22, 2004Assignee: Nitto Denko CorporationInventors: Keisaku Okada, Takeshi Saika, Shuji Senda, Kenjiro Mori, Ken Sato
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Patent number: 6743591Abstract: A method for counting leukocytes which comprises liberating elastase from granulocytes contained in a specimen, adding an anti-granulocyte elastase antibody to the thus liberated elastase, measuring the antibody bonded to the elastase to thereby determine the concentration of the elastase, and then calculating therefrom the number of leukocytes contained in the specimen with the use of the ratio of the leukocyte count to the elastase concentration. This method makes it possible to conveniently and less expensively count leukocytes at a high accuracy comparable to the one established by using a conventional automatic blood cell counter, as the figure shows.Type: GrantFiled: August 31, 2000Date of Patent: June 1, 2004Assignee: Arkray, Inc.Inventors: Akio Okubo, Shigeki Yamada
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Publication number: 20040101908Abstract: A method for analyzing a substance, comprising: a step of obtaining a dispersion complex by co-existing fine particles having a dispersion property higher than that of lyophobic fine particles in a dispersion phase of the lyophobic fine particles at a concentration sufficient for covering a periphery of a lyophobic fine particle group; a step of contacting the dispersion complex and a fluid containing an analyte; and a step of analyzing the analyte using an optical measuring means, wherein the lyophobic fine particles exist in the dispersion phase in a group for providing the surface enhancing effect. The method is effective for analysis of a slight amount substance or a low concentration substance.Type: ApplicationFiled: September 5, 2003Publication date: May 27, 2004Inventors: Takao Fukuoka, Keitaro Nakamura, Yasushige Uji-shi