Sample splitter (2) used to divide a larger sample of particulate material into representative smaller portions. The device uses a fixed conical sample splitter (16) oriented with it apex upwards. Resting on this and translatable upwards is a sample receiving hopper (50). The hopper (50) has open top and bottom ends. When receiving a sample to be divided, the bottom of the hopper rests on the spli...

A chromatographic separation device comprises a body (2) of a semiconductor material which body has a longitudinal channel (1) formed in a surface thereof, the channel (1) being capable of containing a predetermined volume of a liquid or solid material for a chromatography test or separation procedure, the channel carrying at least one electrode (6) positioned intermediate the channel ends. The se...

A device and method for enhancing the speed and sensitivity of biochemical and immunological reactions performed in manifold vacuum devices. Reactions are carried out in one or numerous wells (25) which are integral parts of a manifold plate (10). The internal space of each well (25) is confluent with a waste fluid collection chamber, usually located beneath the manifold, and connected to a vacuum...

Homogeneous assays for determining quantitatively the extent of a specific binding reaction can be carried out effectively on very dilute solutions using measurements of fluorescence if a fluorescence measurement scheme that is capable or rejecting short-lived background fluorescence is employed and if the fluorescent group being measured has the following properties: a) the group being measured m...

A simple, quick and inexpensive method for producing a highly purified ligand for use in immunoassays comprises, according to the invention, the use of antigens and their corresponding antibodies and a covalent or non-covalent binding to a solid support, under which antigens and antibodies are present in dissociated form. These antigens and antibodies are separated from irrelevant molecules, which...

An immunoassay method for detecting low levels of Human Immunodeficiency Virus (HIV) protein in a fluid test sample comprising: (a) providing an indicator sample comprised of a purified and labeled indicator protein, said indicator protein being a synthetic protein that is immunologically cross-reactive with a selected HIV protein; (b) providing immobilized antibody on a solid support that biospec...

Method for analyzing peptide sequences carrying an epitope characteristic of an antigenic protein to the organism of a host. Said method comprises the detection of those tetrapeptidic sequences contained in the antigenic protein which have no counterpart in a data bank gathering information relative to the amino acid sequences of the proteins of the ''somatic self'' of the host. The synthesis of t...

Thin and bright planar sources of light and linear sources of light cannot be obtained with the conventional art. According to this invention, a clad (8) is removed from an optical fiber (1), fine ruggednesses are formed on the surface of a core (9), a reflection film (2) is formed on the cross-section on one side thereof, and the cross-section on the other side is irradiated with a converged beam...

A kaleidoscope composed of two or more mirrors housed within a tubular container, an eye-piece at one end of the tubular container for viewing the kaleidoscopic design, and a translucent or transparent screen located at the end of tubular container that is opposite the eye-piece. The screen is capable of being rotated, in a plane orthogonal to the longitudinal axis of the kaleidoscope, about one o...

An optical resonant assembly which comprises a Fabry-Perot resonant cavity having a pair of parallel mirrors (3) with a photochromic material (5). The photochromic material has a refractive index dependent on the intensity of an incident light beam (9) from a laser of appropriate wavelength. The photochromic materials are selected from photochromic pyran compounds.

A holograph camera is provided with a laser tube producing a laser light beam, and mirrors. To enable the simple and rapid production of holograms without particular specialist knowledge, a base plate is mounted in a housing (1), at at least three points, by securing elements which attenuate vibrations. Fixed to this base plate is the laser tube (10) or another system which produces coherent monoc...

An instrument such as clock or meter includes an actuating mechanism (1) which drives at least one driven member (13) which includes a magnet (20). The actuating mechanism (1) and driven member (13) are concealed behind a separator (12) and at least one indicator (9, 10, 11) is located on the presented face of the separator (12). Each indicator (9, 10, 11) includes a magnet (22) and the arrangemen...

A multi-mode counter network and a method of testing the operation of the multi-mode counter network are disclosed. The multi-mode counter network comprises a counter circuit formed of a plurality of counter registers and a multiplexer circuit formed of a plurality of multiplexers wherein said multiplexers are connected to and associated with one of the registers and are operative to selectively v...

An iterative spline function controlled positioning mechanism such as a machine tool. A movable element of the machine tool is driven about a plurality of axes under computer control along a path formed by a plurality of sections. Each of the path sections is represented in parametric form by spline functions. The element is driven through a plurality of intermediate positions approximating positi...

A writing tablet is formed from a substantially continuous, fanfolded web of uniform width having transverse paths of weakness, along which the web can be torn evenly into individual sheets of uniform size. One face of the web bears a series of pressure-sensitive adhesive patterns, one pattern on each sheet, which pattern contacts the adhesive-bearing face of an adjacent sheet only in nonadhesive ...

A display processor for a system with graphics capability includes color map memories (31, 32, 33) addressed by portions of pixel codes during display line trace intervals. The read-outs from these color map memories (31, 32, 33) provide the primary color component signals from which the drive signals for the display monitor kinescope are derived. The pixel codes from which color map memory addres...

A display processor, as for a small computer, processes pixel codes of various lengths. Three addressable color maps have their read addresses generated independently from portions of each pixel code. The portions of each pixel code used in generating each read address can be selected by programming.

In propeller of fan driven aircraft, cabin noise levels may be reduced by adjustment of the phase relationship between a reference propeller or fan and some or all of the other propellers or fans. An aircraft cabin (1) contains four microphones (2, 3, 4, 5) and two loudspeakers (6, 7) which form the active elements of a noise control system. The microphone outputs are fed via amplifiers (12, 13, 1...

Composite magnetic head consisting of a combination of a base plate and ferromagnetic thin films, that can be mass-produced, that exhibits a relatively small reluctance when used over a high-frequency band, and that is suited for high-density magnetic recording such as digital recording. In the magnetic head of the invention, the base plates on which a ferromagnetic thin film is formed are arrange...

Water-resistant electric wire or cable having a conductor which comprises copper covered with a metal or its alloy whose oxidation product affords an insulating material with no semiconductivity. This wire or cable can prevent formation of semiconductive cuprous oxide which forms a current pass in an insulation composed of a polyolefin resin, thus remarkably improving its life in water in an energ...