Abstract: A vented louspeaker has a speaker and a vent tube within the loudspeaker enclosure, the vent tube being arranged obliquely to the wall on which it is mounted and being longer than the distance between that wall and the opposite wall.

Abstract: An anti-splash device for attachment to a dental tool that delivers an aqueous fluid from a nozzle, which comprises an inverted U-shaped member having a base and integral, opposed legs depending therefrom, one of said legs having a bore extending therethrough and operable to secure said member to the nozzle of said dental tool, said bore providing access to the space between said opposed legs.

Abstract: A derivative of a fibrinolytic enzyme in which the catalytic site on the enzyme which is responsible for fibrinolytic activity is blocked by a human protein attached thereto by way of a reversible linking group.

Abstract: A compound of formula (I) or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof: ##STR1## wherein R represents an alkyl or aralkyl group, substituted on an alkyl carbon atom other than that adjacent to --NH-- group, with one or more functional groups selected from halogen, non-aromatic heterocyclyl linked through carbon, aromatic heterocyclyl, nitro, oxo, --OR.sup.1, SR.sup.1 --P(O)R.sup.2 R.sup.3, --NR.sup.4 R.sup.5, .dbd.NR.sup.6, or a sulphur linked organic radical, wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are various organic radicals.Processes for the preparation of these compounds and pharmaceutical compositions containing them are also disclosed.