Abstract: The invention concerns a double-stranded recombinant DNA cloning vector comprising one single insertion site for foreign DNA and one or two labelling sites adjacent or approximate to said insertion site. In the instance of two labelling sites, said sites flank the insertion site. The labelling site(s) can be individually labelled in a fashion that results in the labelling of the 3' end of either strand. The use of the invention in a process affords the ability to individually label only one strand at the 3' end in a simplified method for base sequencing analysis.

Abstract: The present invention relates to a process for the simultaneous synthesis of several oligonucleotides on a solid phase by using supports of flat material. Finally, the present invention relates to an apparatus for carrying out said process.

Abstract: Mercury vapor is selectively chemisorbed from gas streams by contact with zeolitic molecular sieves containing elemental sulfur. The selectivity and capacity of the zeolite adsorbent in the process is not affected adversely by the presence of adsorbed water vapor or water vapor in the gas stream being treated.

Abstract: The method comprises the steps of providing a camera tube having an evacuated envelope, a photoconductive layer primarily of lead monoxide, an activated getter and an unactivated getter within the envelope. After a period of operation or storage the tube exhibits a deterioration in spectral photosensitivity of the layer. The characteristic ratio of blue light photosensitivity is measured and when the ratio is less than about 80% the unactivated getter is activated to regenerate the tube.

Abstract: The present invention relates to bag making machines, a particular embodiment of which comprises a system of two-way gates, a tubing machine which forms a tube of suitable material, cuts the formed tube into tube lengths and axially discharges the tube lengths into the system of two-way gates, a plurality of sewing machines and associated feed conveyors, the system of gates directing the tube lengths in a cyclic sequence to the sewing machine feed conveyors which transfer the tube lengths sideways to the sewing machines. The operation timing of the sewing machines and associated feed conveyors and the system of two-way gates is controlled with respect to that of the tubing machine drive.

Abstract: Method and apparatus for fluid supply for a continuous-flow analysis system which apparatus includes conduit means passing a stream segmented by an immiscible fluid, and a tube having an inlet portion movable out of and into an operative position a distance within the conduit in an upstream direction and being of a cross-sectional dimension which does not occlude the conduit.

Abstract: A photosensitive layer comprising primarily lead monoxide is deposited on a signal electrode of a vidicon camera tube target. The deposition is carried out in an atmosphere containing oxygen and deuterium oxide. The vidicon target formed exhibits improved transient response leg properties and hole transport characteristics.