Abstract: 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.

Abstract: A diagnostic method and device for use in detecting or quantitating an analyte present in a liquid sample. The method includes reacting an analyte-containing sample with reagents capable of generating a first coil-forming peptide in solution form. This peptide is then contacted with a biosensor whose detection surface has surface-bound molecules of a second, oppositely charged coil-forming peptide, under conditions effective to form a stable &agr;-helical coiled-coil heterodimer on the detection surface. The formation of the coiled-coil heterodimer produces a measurable change in biosensor signal, which is measured to detect the presence of or quantitate the amount of analyte in a sample. Also disclosed is a biosensor device for carrying out the reaction.

Abstract: Provided are affinity support materials having intermediate binding affinity for biological samples. Among the materials provided by the present invention are hydrophilic solid supports composed of hydrophilic ligands coupled to hydrophilic matrixes which are compatible with biological samples, for example, a cell line, a biological fluid such as blood, or a tissue cell lysate. The ligands may include affinity property groups and hydrophilic groups pendent from a backbone, and be configured to at least partially resolve components of a biological sample. Affinity supports in accordance with the present invention may be used in a variety of techniques and apparatuses to achieve improved separations of complex biological samples and thereby enhance the results of biological sample component fractionations, enrichments, purifications, expression product determinations and comparisons, and other biological sample processing techniques.

Abstract: Methods for detecting anti-lipidic particles antibodies and lipidic particles in cellular membranes for the diagnosis of diseases associated to the antiphospholipid syndrome are disclosed. Kits or sets to put these methods of diagnosis into practice are also disclosed. Methods for the therapeutically treatment of diseases associated to the antiphospholipid syndrome are disclosed as well. In addition, methods for the detection of the diverse physiologic states of cells, and those kits useful for this are also disclosed.

Abstract: The present disclosure relates to a method for determining cholesterol in low density lipoprotein comprising the steps of (a) measuring total cholesterol level in a sample containing at least high density lipoprotein, low density lipoprotein, very low density lipoprotein and chylomicron, and (b) measuring cholesterol levels in the high density lipoprotein, very low density lipoprotein and chylomicron in the sample, wherein the cholesterol level in the low density lipoprotein is determined by subtracting a value obtained in the step (b) from a value obtained in the step (a). The present invention enables concurrent determination of cholesterol level in low density lipoprotein and total cholesterol level, facilitating acquisition of two types of biological information at a time.

Abstract: The differential expression of marker proteins in a targeted population provides a means of identifying and isolating cells. A population of cells associated with the regeneration of pancreatic islets is shown to express certain proteins, including the cell surface proteins ErbB2, ErbB3, and ErbB4; and the nuclear protein Msx-2. Populations of isolated pancreatic islet progenitor cells find use in screening assays, to characterize genes involved in islet development and regulation, and in transplantation to provide a recipient with pancreatic islet functions.

Abstract: A process for detecting an analyte which process comprises (a) contacting a sample suspected of containing said analyte with a containment means comprising a barrier which separates signal generating reagents from said sample, in the presence of an element which interacts specifically with said analyte, under conditions whereby interaction between the analyte and the said element results in activation of the signal generating reagents within the containment means on the side of the barrier opposite to the sample, and (b) detecting any signal generated and retained within the containment means from the sample side of the barrier. The process of the invention provides for sensitive detection of very small numbers of analyte materials using measurement techniques which include counting methods such as flow cytometry.

Abstract: An immunoassay, e.g. ELISA, method and kit for determining (preferably quantitatively) an analyte adsorbed at a surface or present in a liquid sample, comprising binding the analyte to a solid phase, attaching a marker to the analyte, and detecting marker attached to the solid-phase. The invention proposes to use a combination of marker and detection (e.g. an enzyme-substrate combination) which is capable of producing a precipitate on a solid phase which carries the marker and to detect the binding of analyte to the solid phase by in-situ determining the change in surface mass of the solid phase due to the formation of the precipitate. Ellipsometry is an example of a technique suitable for determining the change of surface mass of the solid phase, which could be made of a silicon- or chromium-sputtered glass slide The invention shortens the assay time and/or improves the assay sensitivity, and allows to measure extremely low surface concentrations of analytes of interest.

Abstract: The present invention relates to a method for the selected chemical activation of photo-activatable cross-linker molecules around ligand binding pockets and fluorescent groups in macromolecules, especially biological macromolecules, by using fluorescent ligands of the macromolecule and by selecting photo-activatable cross-linker molecules having specific activation energies so that a radiationless energy transfer (Förster transfer) from the fluorescent ligands to the cross-linker molecules, which become activated thereby, takes place.

Abstract: The present invention relates to a method for the quantitative release of natural or recombinant proteins, polypeptides (thermostable immunoligands) able to bind to the Fc-part of immunoglobulins (antibodies, in particular of the IgG class and primarily becoming bound outside the paratope) from complexes in various sample matrixes in order to make these released natural or recombinant proteins, polypeptides or peptides quantitatively available in immunochemical assays and to keep them quantitatively available. The method is characterized by mixing the sample with reagent compound that is able to bind non-specifically to immunoglobulins, and thereafter subjecting the sample to a heat treatment step followed by a cooling step.

Abstract: Mesoporous materials and a method for making such materials is disclosed in which the mesoporous materials are made by forming an aqueous solution having an organometallic compound; adding a solution comprising a pore forming material selected from the group consisting of monomeric polyols, polyacids, polyamines, carbohydrates, oligopeptides, oligonucleic acids, carbonyl functional organic compounds, and mixtures and derivatives of these materials to form a sol get matrix by polycondensation; drying the sot gel matrix; and removing the pore forming material from the dried sot-gel matrix to thereby form a mesoporous material. The mesoporous materials have pore diameters of from about 20 Å to about 100 Å and may be used with a biologically active agent immobilized within the pores of the mesoporous material and introduced into a biological system.

Abstract: A method of assaying for an analyte which occurs at least partially bound as a complex with its soluble receptor or binding protein, the method comprising the steps of: i) mixing a biological fluid serum sample containing the analyte to be determined with a detergent for dissociating said complex, ii) mixing the sample from step i) with reagents, including a specific binding partner of the analyte for binding to the analyte, for performing a specific binding assay for the analyte, iii) and mixing the sample from step i) with a sequestrant for the detergent, whereby the binding of step ii) is performed in the presence of the sequestrant.

Abstract: The invention relates to devices and methods for carrying out quantitative fluorescence immunoassays using evanescent field excitation. Light from at least one light source is directed onto the boundary between two media which have differing refractive indices. The light source emits practically monochromatic light with a wavelength suitable for exciting a marking substance. The light is directed onto a boundary surface disposed between an optically transparent base plate, the refractive index of which is greater than that of the material above the boundary surface, and a receiving region for the sample. The receiving region is covered with a covering plate on the side disposed opposite the base plate, there being arranged between the base plate and covering plate at least one functional layer. A detector for detecting the fluorescent light is disposed on the same side of the base plate as the light source.

Abstract: Solid phase methods for the identification of an analyte in a biological medium, such as a body fluid, using bioluminescence are provided. A chip designed for performing the method and detecting the bioluminescence is also provided. Methods employing biomineralization for depositing silicon on a matrix support are also provided. A synthetic synapse is also provided.

Abstract: A test piece for use in biological analyses includes a plurality of different known specific binding substances disposed in predetermined positions on a substrate. The specific binding substances are disposed on a plurality of surfaces provided by the substrate and arranged in the direction of thickness of the substrate.

Abstract: The present invention relates to devices comprising electrosensors containing capture reagents, their preparation thereof, and their use for detecting, preferably, quantitative measurement, of analyte in a liquid sample. In particular, the invention relates to an enzyme electrosensor, e.g., electroimmunosensor, device for electrochemical detection and preferably, real-time measurement, which is suitable for use at point-of-care settings by unskilled personnel.

Abstract: The invention provides a reagentless assay kit for analyte in a sample comprising a modular affinity assembly including at least one sensor unit comprising a ligand having binding affinity for the analyte (affinity module) operatively associated with a reporter probe (reporter module) responsive to changes in the sensor unit induced by analyte/receptor complex formation by transduction of a characteristic detectable signal. Assays employing the modular assembly are also provided.

Abstract: Solid phase methods for the identification of an analyte in a biological medium, such as a body fluid, using bioluminescence are provided. A chip designed for performing the method and detecting the bioluminescence is also provided. Methods employing biomineralization for depositing silicon on a matrix support are also provided. A synthetic synapse is also provided.

Abstract: The present invention involves a method for assaying a substance. The method of the present invention comprises contacting the substance with an assay agent comprising a catalytic agent to associate the substance with the catalytic agent, contacting the resulting associated substance with a label precursor capable of reacting catalytically with the catalytic agent to release the label, and detecting a mass label. The present invention also involves a kit for assaying a substance. The kit of the present invention comprises an assay agent comprising a catalytic agent, and a label precursor capable of reacting catalytically with the catalytic agent to release a mass label.

Abstract: Solid phase methods for the identification of an analyte in a biological medium, such as a body fluid, using bioluminescence are provided. A chip designed for performing the method and detecting the bioluminescence is also provided. Methods employing biomineralization for depositing silicon on a matrix support are also provided. A synthetic synapse is also provided.