Abstract: DNA recombination can be effected through transposition by injecting a host with a transposition vector prepared from the terminal sequences of the Hermes element of M. domestica on either side of a structural gene to be expressed in the recombinant host. Transposition can be improved by use of a helper plasmid including the transposase gene of Hermes operably linked to a promoter sequence effective in the host.

Abstract: An anchor plate is arranged for cooperation with an underlying mounting plate to position a cabinet therebetween, wherein the anchor plate includes in a first embodiment a slide block mounted within a slot within the anchor plate, and the slide block hingedly mounting a mounting leg, including a flange for abutment with a forward surface of the cabinet for positioning the cabinet during a mounting procedure. A modification of the invention includes a generally serpentine securement leg slidably mounted within a channel defined by an anchor plate structure, wherein the securement leg includes a plurality of spaced abutments arranged in a parallel relationship to provide for positioning of the cabinet in communication with one of said abutments for positioning the cabinet during a mounting procedure.

Abstract: Detectors for monitoring step changes of pressure in a vessel, for example a pipeline, include sensors outside the vessel for detecting a change in its dimensions resulting from a fall in pressure occurring at a minimum rate of 0.005 bars per second which is not followed by a corresponding rise in pressure within 0.05 seconds. They are useful in detecting leaks.