摘要:
A chromatography column cartridge system comprised of an internal pressure-stable precision glass tube which can be filled with adsorbent and an external protection and/or temperature control jacket with column connection parts which can be screwed on. The column connection parts comprise a union nut which is screwed onto the protection and/or temperature control jacket. The union nut contains a milled nut and a plunger which seals the glass tube radially. Feed and discharge lines for the mobile phase pass through the column connection parts.
摘要:
Phase supports are disclosured for the partition chromatography of macromolecules. The phase supports are composed of non-adsorptive base support particles which are insoluble in the phase system and which have an average particle size within the range from 7 to 2000 .mu.m. The surface of the support particles is coated with a material which is insoluble in the phase system, adheres firmly to the particles and has an affinity for one of the phases of the phase system for the partition chromatography. Also disclosed is a process for the preparation of the phase supports and their use for separating, by partition chromatography, macromolecules, biopolymers, subcellular units and whole cells, particularly in an aqueous polyethylene glycol/dextran two-phase system.
摘要:
An apparatus for evacuating and sealing rectangular packages includes a turntable, a plurality of vacuum hoods arranged circumferentially on the turntable and having an open position in which a package to be evacuated and sealed is received and a sealed, closed position. There is provided a package-engaging surface on each hood on its inside and an abutting mechanism arranged on the turntable below each vacuum hood. Each abutting mechanism also has a package-engaging surface. The abutting mechanism is arranged for radially outward movement for displacing, with its package-engaging surface, a package towards the package-engaging surface of the vacuum hood. In the closed position of the vacuum hood the package thereunder is engaged at opposite sides by the two surfaces.
摘要:
To apply hard cutting particles, for example of tungsten carbide, on the surface of the cutting edge of a cutting tool, such as a saw blade, a drill, or the like, the cutting edge is partially melted by an energy beam, for example a laser beam, or an electron beam. A laser beam is preferred since, then, the process can be carried out in air, or in a protective gas atmosphere, rather than in a vacuum. The beam partially melts the cutting edge and the granules of the hard metal particles, preferably in a random grain size of between 0.3 to 1.5 mm is permitted to run down, over the partially melted surface, excess being collected for reuse; alternatively, the partially melted surface can be dipped into the granules, and permitted to solidify.
摘要:
Dibenzazepine derivatives in free base form or in pharmaceutically acceptable acid addition salt form are useful as neuroleptic, antidepressant, sleep-inducing, sleep-promoting and sleep-prolonging agents.
摘要:
The magnetic field which is required to hold image-forming toner particles on the tubular carrier of electrographic copiers is provided by single piece integrally formed permanent magnet bodies extending from end to end of the tubular carrier, the latter comprising a thin layer of ferromagnetic material to reduce the effect on inhomogeneities which may exist in the magnet bodies.
摘要:
In a planetary extruder for extruding thermoplastics materials, a threaded main spindle is meshed with and surrounded by threaded planetary spindle. To improve pull-in of material, the planetary spindles are provided in groups, each group comprising at least three spindles. The first planetary spindle of each group corresponds in length to the main spindle and succeeding spindles, considered in an opposite direction to the direction or orbital movement of the planetary spindles, of each group are each shorter than the spindle which immediately precedes it to form receiving spaces for material fed by a feed screw, which receiving spaces in operation are continuously enlarging.In one embodiment in each group, the spindles which are successively shorter are followed by spindles which are successively longer.
摘要:
A computer-implemented method and a device for optimizing an optical element comprising at least one diffraction grating, wherein at least one refractive surface contributing to the refractive light deflection and/or the at least one diffraction grating of the optical element are/is optimized in such a way as to minimize the color fringe and at least a second-order aberration of the optical element. Also, a corresponding production method and a corresponding device for producing an optical element comprising at least one diffraction grating.
摘要:
A module for a tester for the testing of circuit boards is described. Such testers have a basic grid on which an adapter and/or a translator may be arranged in order to connect contact points of the basic grid with circuit board test points of a circuit board to be tested. The module comprises a support plate and a contact board. The contact board is formed by a rigid circuit board section which is described as the basic grid element, and at least one flexible circuit board section. Provided on the basic grid element are contact points which each form part of the contact points of the basic grid. The basic grid element is mounted at an end face of the support plate, and the flexible circuit board section is bent in such a way that at least part of the other section of the contact board is parallel to the support plate. Each of the contact points of the basic grid element is in electrical contact with conductor paths running in the contact board and extending from the basic grid element into the flexible circuit board section.
摘要:
Improvements in the existing procedures and materials for conduct of high gradient magnetic separation (HGMS) are disclosed. Superior superparamagnetic particles, optionally coated with a polysaccharide or other, usually organic, materials can be prepared in uniform compositions with homogeneous magnetizations. The coating can conveniently be conjugated to a specific binding moiety complementary to a biological material whose purification or separation is desired. In addition, plastic coated matrices which form superior magnetic gradient-intensifying supports are disclosed, along with improved methods and apparatus to conduct HGMS.