Abstract: The invention relates to a vehicle, such as a truck, comprising a chassis having flexural strength but being torsionable, on which a non-torsionable assembly is arranged above an intermediate frame, the assembly comprising a central tube at its lower side extending in the center of the vehicle, the tube being connected to the intermediate frame at several locations by means of bearings. Such a truck is especially characterized in that the intermediate frame is formed having flexural strength but being torsionable and in that a single three-point bearing is provided between it and the central tube, which comprises a rear, in axial direction fixed, pivot bearing as well as two lateral slide bearings at a transverse beam of the central tube, said pivot bearings having spherical bearing surfaces to which horizontal supports are associated at the intermediate frame.

Abstract: A method for isolating a detergent-free virus-antigen from a suspension of said virus-antigen containing detergent, which method comprises precipitating said virus-antigen by adding a polyethylene glycol to said suspension and then isolating the detergent-free virus-antigen precipitate by sedimentation, said detergent remaining in said suspension.