Abstract: A language learning system adapted to facilitate the learning of a language by at least a first of two separated users comprising a web-based system which integrates peer-to-peer communications with Voice over Internet Protocol technology to provide one-to-one communication which enables said users to speak in real-time with the intention of taking part in scripted role-play scenarios in the language to be learned which enables the at least first user to practice skills in this language wherein the text of a selected role-play is displayed before each of said users simultaneously with the said speaking in real-time.

Abstract: A peristaltic pump has a sealed pumphead housing a and a pressure transducer 26 which is responsive to the pressure within the pumphead housing 8. The output 28 of the transducer 26 is processed to provide an indication of the condition of the hose 18 of the pump.

Abstract: A peristaltic pump includes a rotor (21) comprising a hub (211), an actuating part (214) mounted on the hub (211) for operative engagement with a flexible tube (7) of the pump, the actuating part (214) being radially displaceable relatively to the hub (211) and being connected to the hub (211) by an elastic connecting portion; and adjustment means (22) for adjusting the radial position of the actuating part (214) and for maintaining the actuating part (214) in an adjusted position.