Abstract: A container for transporting an accidentally severed limb 17 or other body part and keeping it cool to aid the success rate of replantation surgery comprising a suitcase-like openable container 2 made of aluminium sheet 4 with a heat insulating covering 5. To maintain the temperature of the container between 2.degree. C. and 6.degree. C., a cylinder of carbon dioxide 19 is mounted in a holder 9, 18 on the outside of the container and has its shut-off valve 20 connected to an injector nozzle 23 in the container. Carbon dioxide discharged by the nozzle 23 produces dry ice in the container 2 to cool it. The flow of gas through the nozzle 23 is controlled by a thermostatic device which includes a spring 24 made of a shape-memory alloy which allows the nozzle 23 to be closed at temperatures below 2.degree. C. but which regains its strength at a temperature of 6.degree. C. to open the nozzle when the inside of the container has warmed up again to this temperature.

Abstract: A method of preparing an extract from hops comprises contacting the hops to be extracted with carbon dioxide in the liquid state to dissolve the matter to be extracted in the liquid carbon dioxide, heating the solution of extract to evaporate carbon dioxide from the solution of extract, compressing and condensing the evaporated carbon dioxide vapor to re-form liquid carbon dioxide, and re-cycling the liquid carbon dioxide to contact the material to be extracted. At least part of the heat evolved from the carbon dioxide vapor after its compression and during its change of state from vapor to liquid carbon dioxide is used to cause the change of state of the liquid carbon dioxide in the solution of the extract to evaporate the carbon dioxide from the solution of the extract.A plant for the preparation of an extract of hops by extraction with liquid carbon dioxide is also disclosed together with modifications of the plant to enhance the recovery of hop oils or to obtain a separate extraction of the hop oils.

Abstract: A method of preparing an extract from a material comprises contacting the material to be extracted with carbon dioxide in the liquid state to dissolve the matter to be extracted in the liquid carbon dioxide, heating the solution of extract to evaporate carbon dioxide from the solution of extract, compressing and condensing the evaporated carbon dioxide vapor to re-form liquid carbon dioxide, and re-cycling the liquid carbon dioxide to contact the material to be extracted. At least part of the heat evolved from the carbon dioxide vapor after its compression and during its change of state from vapor to liquid carbon dioxide is used to cause the change of state of the liquid carbon dioxide in the solution of the extract to evaporate the carbon dioxide from the solution of the extract.