Abstract: A liquid treatment device includes a body. The body includes a container section defining a container for holding liquid to be treated and a liquid treatment section defining a cavity and including at least one liquid treatment part. The body includes at least one liquid-impermeable wall defining at least a bottom of the container and at least one wall enclosing the cavity. These walls are inseparable, any seams in transitions between these walls being between parts of the body joined by bonding. The liquid treatment device is provided with at least one first liquid-permeable window allowing liquid to egress from the device and at least one second liquid-permeable window allowing liquid to flow from an interior of the container to the cavity. The liquid treatment device includes a barrier between the cavity and the container interior, inseparable from the body, the barrier including at least one of the second windows.

Abstract: A liquid treatment device includes a container section defining a container for holding liquid to be treated. The container section includes at least part of a body, the body including at least one wall forming at least a bottom of the container. At least one first liquid-permeable window through the wall forming the bottom of the container is provided. The device also includes a liquid treatment section, including a cavity surrounded by a cavity side wall forming at least one second liquid-permeable window for treating liquid passing through it. The cavity side wall is sealingly joined to a liquid-impermeable wall section along the circumference of the cavity side wall and around a liquid path through the cavity and the first liquid-permeable windows at an end of the cavity side wall proximal to the at least one first liquid-permeable windows. The liquid-impermeable wall section is an inseparable part of the body.

Abstract: A device for treating a liquid, including a container for collecting the liquid to be treated, including a first fastening unit which has the property that the unit develops a force of attraction under the action of a magnet or has the property of a magnet, and a cartridge for treating the liquid and which can be detachably fastened to the container, including a second fastening unit which has the property that the unit develops a force of attraction under the action of a magnet or has the property of a magnet. The first fastening unit and the second fastening unit interact such that the cartridge can be detachably fastened to the container.

Abstract: The present invention is directed to a method of isolating and concentrating biological materials based on their buoyant density by subjecting a sample containing the biological materials to density-gradient ultracentrifugation. In one aspect of the present invention, a method for isolating at least one biological material is provided. A sample containing at least one biological material is introduced into an ultracentrifuge having a density-gradient established therein, and the sample is centrifuged until at least one biological material is isolated according to its buoyant density.