Abstract: A single-use, sealed and tamper-proof condom packaging is formed from an integrally-molded body and a cover connected with a lateral hinge. The body has an annular groove for insertion of the rolled portion of the condom whose terminal cap inserted between the cover and the central stiffening boss, after which the peripheral welding bead is formed.

Abstract: An improved electronic price display system has rails into which are installed price display labels. Ridges along the top and bottom of the rails are shaped to receive a label readily. A removal tool may be engaged to release the pawls of the label to extract the label. Ridges at the rear of the rails, together with a resilient insert, permit quick mounting to a shelf with a minimal number of fasteners. A hemicylindrical feature at the back of the rails permits generous area of contact with a mounting screw having a hemispherical head. Opposed groove features permit the concealment of the screw heads and provide a visual design element.Angled ridges on the rear face of the label engage with knurls on the rails providing contact wiping, enhancing electrical integrity of the label-to-rail connection, and also fix the label in place.A feature along an edge of the rail provides a cylindrical concavity.

Abstract: A fecal specimen may be tested for the presence of occult blood combining the fecal specimen with(a) an oxidizable substrate that produces a colored product in the presence of peroxide and hemoglobin;(b) hydrogen peroxide or a peroxide source; and(c) an enhancer selected to enhance the sensitivity of the test. Suitable enhancers are monocyclic nitrogen-containing aromatic heterocyclic compounds; tertiary or quaternary ammonium compounds having a phenyl, hydroxy alkyl or esterified hydroxy alkyl attached to the nitrogen; or quinoline or a substituted derivative thereof. If hemoglobin is present in the fecal sample, the oxidizable substrate is converted to the visibly detectable, colored product.

Abstract: Enzymatic synthesis of oligonucleotides may be performed in a single vessel without intermediate purification, by the steps of:(a) combining a nucleotide primer sequence and a blocked nucleotide in the presence of a chain extending enzyme whereby a reaction mixture is formed containing the blocked nucleotide coupled to the nucleotide primer sequence at its 3' end;(b) inactivating the chain extending enzyme;(c) removing the blocking group from the primer-blocked nucleotide to form a primer-nucleotide product; and converting any unreacted blocked nucleotide to an unreactive form which is substantially less active as a substrate for the chain extending enzyme than the blocked nucleotide.