Abstract: A device is provided by means of which biomolecules in samples in a volume range from <1 ?l to 500 ?l can be received, treated and stored in a quick, reproducible and loss-free manner as easily, effortlessly and practically as possible, and without any risk of damaging the device. The device includes sample vessels that are configured, in terms of size and shape, as dimensionally and positionally stable capillaries that are open at both ends, the longitudinal walls of which are completely or partially made of a semi-permeable membrane.

Abstract: The invention elates to a device for the simultaneous dialysis of a number of fluid samples, comprising a vessel for the dialysis fluid, with an inlet and outlet, a fill-level regulation and a sample plate (3) with a number of similar sample vessels (5) of ?l range size, arranged in a raster (n×8×12), the upper ends of which are open and the lower ends of which are sealed by a semi-permeable membrane (7) lying in a plane. In the raster region of the sample vessels (5), the sample plate has no regions or elements which extend beyond the plane of the membrane (7), or which form or support gas barriers after dipping in the dialysis fluid (2). The sample plate (3) comprises elements in the boundary region thereof for the escape of air after dipping in the dialysis fluid. Both sample fluids and dialysis fluids are agitated.