Abstract: The hydraulic chamber (2) of a hydraulic swivel motor comprises a lateral opening which is closed by means of a cover (8). The seal of the hydraulic chamber with respect to the surroundings is achieved by a circumferential cover seal (12) which is produced by friction stir welding. The weld root (12?) extends to the vicinity of the faces of a sealing strip (10) which is provided between a shaft (4) and the cover (8) for separating two working chambers (A, B). This measure prevents leakage to the surroundings, on the one hand, and minimizes leakage between the working chambers (A, B), on the other hand.

Abstract: The present invention pertains to a process for determining an analyte, especially a low-molecular-weight pollutant in a sample. It is carried out by partially dipping into the sample a test strip, on which antibodies which are specific for the analyte and to which in turn a tracer is bound, are immobilized. During the capillary migration of the sample through the test strip, the analyte partially displaces the tracer. The tracer that has remained on the antibody is subsequently visualized by, e.g., dyeing. The intensity of the dyeing is an indicator of the amount of analyte detected.