Abstract: In one embodiment, an apparatus is provided for testing for the presence of analytes in a sample. The apparatus comprises a source of light directed at the bottom surface of a substrate to achieve total internal reflection and to generate an evanescent field. An array of capture elements is immobilized on the top surface of the substrate. The bottom surface of the substrate is configured as a sawtooth (in cross section), the “teeth” aligned with the rows or the columns in the array. The outer faces of the sawtooth “prisms” are non-parallel to the substrate top surface, and specific requirements are imposed on the prism light-entrance face, and the substrate thickness and refractive index.

Abstract: Ellipsometry systems for imaging binding events between analytes in a sample and an array of ligands in an evanescent field generated by a beam of light reflected from the plane of the ligands is adapted to a multiwell plate structure in common use. In one example, a film of prism arrays is affixed to the underside of the plate with each prism array located in registry with a well and ligand arrays being immobilized on the (planar) bottom surface of the wells. The prism array may be formed in a film and juxtaposed with the bottom surface of the plate or a prism array can be made integral with the plate bottom of a multiwell plate.

Abstract: Each well of a multiwell plate adapted to accept a plurality of biological samples for testing for the presence of analytes in the sample is further adapted herein for immobilizing on the side walls of a well a 3D arrangement of ligand arrays. A well is formed with planar side walls and a stack of sample separators is placed within a well in positions so as to not come in contact with ligand spots in the array(s). The spacing between each pair of adjacent separators in a stack forms a sample chamber in a position corresponding to an array of the 3D arrangement of ligand arrays.

Abstract: In one embodiment, an apparatus is provided for testing for the presence of analytes in a sample. The apparatus comprises a source of light directed at the bottom surface of a substrate to achieve total internal reflection and to generate an evanescent field. An array of capture elements is immobilized on the top surface of the substrate. The bottom surface of the substrate is configured as a sawtooth (in cross section), the “teeth” aligned with the rows or the columns in the array. The outer faces of the sawtooth “prisms” are non-parallel to the substrate top surface, and specific requirements are imposed on the prism light-entrance face, and the substrate thickness and refractive index.

Abstract: An apparatus and method for real time, label-free imaging and quantitation of binding events at an array of positions are provided. Total internal reflection from a planar side wall of a well of a multiwell plate is used to create an evanescent field in the plane of a pattern of ligands immobilized on the wall. Embodiments include imaging and multiple analyte detection and quantitation of a single wall of a single well as well as the simultaneous imaging and multiple analyte detection and quantitation of a number of wells.

Abstract: Multiwell plates commonly used for immunoassay are increased in capacity and adapted for ease and speed of testing by forming a plurality of solid posts in each well of a plate. The posts and plate material and the dimensions of the posts are chosen to allow the immobilization of ligand patterns on an exterior wall of a post in a well and to permit a collimated beam of light directed to the post in a direction to achieve total internal reflection from a wall to generate an evanescent field in the plane of the ligands immobilized on the exterior wall of the post. The reflected light carries an image of localized intensity variations due to binding events between the ligand patterns and analytes in a sample introduced into a well. A cover plate seals the wells and provides for through holes for introducing sample material to the wells.

Abstract: Multiwell plates commonly used for immunoassay are increased in capacity and adapted for ease and speed of testing by forming a plurality of solid posts in each well of a plate. The posts and plate material and the dimensions of the posts are chosen to allow the immobilization of ligand patterns on an exterior wall of a post in a well and to permit a collimated beam of light directed to the post in a direction to achieve total internal reflection from a wall to generate an evanescent field in the plane of the ligands immobilized on the exterior wall of the post. The reflected light carries an image of localized intensity variations due to binding events between the ligand patterns and analytes in a sample introduced into a well. A cover plate seals the wells and provides for through holes for introducing sample material to the wells.

Abstract: Ellipsometry systems for imaging binding events between analytes in a sample and an array of ligands in an evanescent field generated by a beam of light reflected from the plane of the ligands is adapted to a multiwell plate structure in common use. In one example, a film of prism arrays is affixed to the underside of the plate with each prism array located in registry with a well and ligand arrays being immobilized on the (planar) bottom surface of the wells. The prism array may be formed in a film and juxtaposed with the bottom surface of the plate or a prism array can be made integral with the plate bottom of a multiwell plate.

Abstract: An apparatus and method for real time, label-free imaging and quantitation of binding events at an array of positions are provided. Total internal reflection from a planar side wall of a well of a multiwell plate is used to create an evanescent field in the plane of a pattern of ligands immobilized on the wall. Embodiments include imaging and multiple analyte detection and quantitation of a single wall of a single well as well as the simultaneous imaging and multiple analyte detection and quantitation of a number of wells.

Abstract: Apparatus for determining the status of hair bulk in an area of a scalp is operative to provide a metric over a sufficiently large area to permit revisiting with only negligible misalignment error. Accurate re-measurement of hair status in accurately identified areas produces a reliable metric for determining degree of hair loss and or the effectiveness of treatment.

Abstract: An apparatus and method for real time, label-free imaging and quantitation of binding events at an array of positions are provided. Total internal reflection from a planar side wall of a well of a multiwell plate is used to create an evanescent field in the plane of a pattern of ligands immobilized on the wall. Embodiments include imaging and multiple analyte detection and quantitation of a single wall of a single well as well as the simultaneous imaging and multiple analyte detection and quantitation of a number of wells.