Abstract: An apparatus and process is provided for an electrophoretic determination the primary structure of nucleic acids. The apparatus comprises a cuvette shaped as a sleeve having a gel shaped as a hollow cylinder positioned on one of the side surfaces of the sleeve and having samples of the nucleic acid in recesses on its end face located in a circle. The sleeve is provided with a rotation drive and its side wall and the bottom together with the side wall and the bottom of the second sleeve mounted coaxially with the first sleeve form chambers for placing electrode solutions therein. Between the electrode solutions in the region between the side walls of the sleeves there is located a non-polar liquid, its density is higher than that of the electrode solution located above it and lower than the density of the electrode solution located thereunder.

Abstract: An apparatus for photometrically scanning gels comprises a monochromator from which the light beam passes through a stop aperture and a gel placed in a cell, which are installed one after the other along the path of the light beam. The cell is caused to move relative to the light beam by means of a drive and the light is received by a photometer. The cell is made in the form of two superposed discs each having on one side congruent grooves which define at least one compartment for placing the gels therein when the discs are superposed on one another.

Abstract: A micrometering liquid sample dispenser for dispensing several sample liquids into a test tube comprises syringe samplers arranged on a stand and equal in number to the number of sample liquids, the syringe samplers being provided with pipes or hoses for conveying the metered sample liquids to the test tube, the stand being kinematically linked with a sample volume regulator. The apparatus is further provided with a control unit incorporating a sample volume and timing setter the outputs of which are connected to the sample volume regulator, to a drive for step-by-step rotation of the test tube tray and to a drive for reciprocating the ends of the sample liquid dispensing pipes. Each of the syringe samplers is provided with means for locking the piston rod thereof to effect a programmable liquid sample metering, the lock means being electrically connected with a corresponding output of the sample volume and timing setter.

Abstract: A system for measuring radioactivity of labelled biopolymers which comprises an electric drive to ensure stepwise travel of a set of containers, a means for acid precipitation of biopolymers for proportioned feeding of biopolymers to the containers with a biological sample of a coprecipitator and a suspension of diatomite in an acid solution, a means for taking precipitated samples from the containers, and a means for filtering precipitated biopolymers. The system also includes a program unit with a control unit to interact with the above means. The mixture is fed to a detection chamber of a radioactivity measuring device.

Abstract: An arrangement for continuously measuring the radioactivity of solutions of matters in a homogeneous mixture with a liquid scintillator, comprising two measuring chambers and a two-way tap valve connecting, in its first position, the first measuring chamber with the mixing device, and the second measuring chamber with a multi-channel pump, and in its second position, the first measuring chamber with the multi-channel pump, and the second measuring chamber with the mixing device.