A process is described for synthesising hydrocarbons from a mixture comprising carbon monoxide and hydrogen and possibly carbon dioxide CO2, in the presence of a supported catalyst comprising at least one group VIII metal. When torque is applied to the coupler, one or more gripping surfaces are forced apart by a cam mechanism. An example of such a traffic redirection event is failure of a remote head-end node or failure of any of its TE-LSPs. An apparatus is provided for inducing hypothermia in undesirable plants by applying a treating substance. A temperature detecting circuit may be used to change the frequency of performing a calibration operation.