Abstract: An ejector for a printed circuit board plug-in unit for use with printed circuit board cages having a fixed ejection surface. The ejector is constructed and defined to be pivotally mounted through an aperture provided for the panel member of the plug-in unit for pivotally engaging the fixed ejection surface of the cage system for extracting the electrical connector carried by the printed circuit board of the plug-in unit from the electrical connector of the cage system. The ejector has a handle portion with an extraction portion extending through the aperture of the panel along with a portion defining a bearing surface for engaging the fixed ejection surface. A bracket secured to the panel member also pivotally secures the ejector extraction portion to the printed circuit board.

Abstract: A rigid connector secured to the front end of the core of the flexible shaft of this invention has a front portion axially receivable in a noncircular well in a driving shaft of a driving device and has a radially projecting circumferential flange rearwardly adjacent to that portion. Secured to the front of its sheath is the rear one of two telescoped tubular parts, each of which has a counterbore that opens to the other and defines an internal annular shoulder. One tubular part is threaded into the counterbore in the other, and the flange is axially slidable in the counterbore in that one, between the shoulders. The front portion of the front tubular part is formed for detachable securement directly to a conventional fixed collar on the driving device.

Abstract: A diagnostic reagent for hepatitis A antibody is prepared by adhering hepatitis A antibody to a surface by non-specific adsorption followed by specific coupling of hepatitis A antigen to the antibody. This reagent is useful in an in vitro assay for hepatitis A antibody.

Abstract: A public-key data encryption system employing RSA public-key data encryption including a message encrypter capable of encrypting messages using a non-secret encryption key, a transmitter-receiver coupled to the message encrypter which transmits or receives an encrypted message to or from a remote location, the transmitter-receiver also being coupled to a decrypter capable of decrypting a received encrypted message using a decryption key which is a secret input to the decrypter, and an encryption-decryption key generator, including a microprocessor or other large-scale integrated circuit or circuits formed to generate a sequence of prime numbers beginning with a selected known prime number having a length relatively short with respect to the desired length of the last in the sequence of prime numbers, and which is constructed to form the sequence of prime numbers in the form hP+1 where P is the preceding prime number in the sequence, and to test hP+1 for primality by first determining if hP+1 has a GCD of 1 wi

Abstract: Semi-automated assays for viral infectivity and an assay for serum neutralizing antibody content are based on staining the cells and macroscopic reading of the cytopathic effect.

Abstract: Communication over data links using binary synchronous protocol that is to be made secure according to the Federal data encryption standard (DES) is enhanced by utilizing an encrypted message format wherein the initialization vector for the DES algorithm is at the trailing end of the message. Additional information or control words may also be strung at the trailing end of the encrypted message format without causing throughput loss while enhancing the security and flexibility of the encrypted message in both point-to-point and multipoint systems.

Abstract: An immune adherence hemagglutination assay for detection of hepatitis A antigen or antibody. Plasma having known high titer of hepatitis A antibody, and gamma globulin having known high titer of hepatitis A antibody.

Abstract: A pyramidal-shaped living structure, having a triangular base plan, includes a pyramidal-shaped solar heating unit which forms the apex of the living structure. The heating unit contains a heat conducting chamber having a transparent wall. Solar rays enter the heat conducting chamber and impinge upon heat conducting elements disposed therein. The heat conducting elements absorb the heat energy in the solar rays causing the temperature of the elements to rise. The elements in turn heat air contained within the chamber. The heated air is then distributed to the interior of the living structure or to a subterranean heat exchange and storage unit, where the heat is extracted from the air and stored for use within the structure during those periods when there is not enough solar energy available to produce the heat required in the living areas.

Abstract: Liquid containing hepatitis A antibody is adsorbed on a surface. The surface is then coated with a proteinaceous material and incubated in the presence of the sample to form a complex of hepatitis A antigen and hepatitis A antibody. The complex is incubated again in the presence of excess radioactively labelled hepatitis A antibody, and the resulting radionuclide is measured.

Abstract: HB.sub.c Ab is detected in biological fluid by contacting HB.sub.c Ag derived from Dane particles and adhered to a surface with the biological fluid and an antibody-enzyme conjugate. The HB.sub.c Ag is adhered to the surface in the presence of a nonionic surfactant.

Abstract: Compositions comprising HB.sub.s Ag and a physiologically acceptable medium are useful as diagnostic and immunologic agents.

Abstract: HB.sub.c Ag is prepared by isolating Dane particles by isopycnic banding of fluid from HB.sub.s Ag positive donors, optionally but preferably pelleting the Dane particles, and then removing the surface antigen by contacting the Dane particles with a nonionic surfactant having from about 15 to about 35 oxyethylene units in the presence of a reducing agent such as mercaptoethanol. The isolated core antigen is used as a diagnostic and immunologic agent.

Abstract: A method of manufacturing and using a precision insert in a brazing process. An insert, manufactured to conform to the curvature of the metal members to be joined, is placed between the abutting metal members. Retaining wires are then welded to the insert and to the metal members, thereby, holding the insert in place. The braze metal is applied so that when heated the braze metal is drawn by capillary action into the space between the insert and metal members. Cooling of the assembly then results in a uniform bond.

Abstract: Hepatitis A antigen obtained from the stools of patients infected with hepatitis A (infectious hepatitis) virus has been found to be usable in fast, simple assays for hepatitis A antibody and thus usable in diagnosis of hepatitis A disease, and for the preparation of hepatitis A vaccine.

Abstract: An expansible mandrel constructed to radially expand equally comprising a generally truncated polyhedron-shaped core member and a plurality of wedge members defining a cylinder, the core member being axially movable relative to the wedge members. Elastic means surrounding the wedge members maintain the wedge members in position relative to the core member.

Abstract: Coal can be mined from a substantially vertical or steeply inclined seam by forming a cavity in the seam and filling the cavity with a magnetite slurry having a specific gravity greater than the coal being mined therefrom.As the coal is dislodged, it will float to the top and be pumped from the cavity by the excess magnetite slurry being supplied to the cavity. A coal-magnetite slurry separator is used to separate the coal from the magnetite slurry, whereupon the magnetite slurry is reinjected into the cavity.

Abstract: A process for the controlled manufacture of cells and vaccines in which reproducable real time quantitative assays are utilized to ascertain the physical and chemical state of the system, in order to more efficiently manage the system, so that cell sheet formation may be determined and the vaccine may be harvested at its maximum titre, thereby resulting in significantly increased yields and decreased production costs.