Abstract: Magnetic enrichment method, wherein the desired biological component is collected from a solution, which component is thereafter enriched in a liquid in such a manner that by means of the micro particles attached to the magnet or attached by means of at least one magnet at least one biological component is collected in a closed reactor vessel. Thereafter at least one biological component is enriched in such a manner that the desired component is released to the solution. The reactor unit is a closed vessel, wherein the prevailing conditions are controllable. The shape and the location of the magnet unit in the reactor unit are adjusted in a preferable manner to collect the desired biological component.

Abstract: A method for opening an opening (10) using an elastic plug (2, 2?) whose outside diameter in a static state (rL), is larger than diameter (rp) of opening (10), and which plug has a cavity (12) at its end. An extending device (4, 4?) is inserted into plug cavity (12) so that the plug is tightly pressed around extending device (4, 4?). Plug (2, 2?) is extended by inserting extending element (20) of extending device (4, 4?) into plug cavity (12) so deeply that outside diameter (rV) of plug (2, 2?) is equal to, or smaller than, diameter (rp) of opening (10). The extended plug is inserted into opening (10), and its extension is reduced such that plug (2, 2?) closes opening (10) and adheres to it so tightly that extending device (4, 4?) is detachable from plug (2, 2?). A method for opening the opening (10) when closed by plug (2, 2?) is also disclosed.

Abstract: A device for transfer suitable for capturing and releasing microparticles binding an immobilized substance, which includes a magnet as well as either an extendable membrane, shapable membrane or magnet's coating such that the membrane or coating pressing tightly against the magnet's surface separates the magnet from the microparticles but does not substantially weaken the magnetic field directed at the microparticles. Also disclosed is a method for transferring a microparticle immobilized substance from a first vessel to a second vessel where the microparticles are of a magnetic or magnetizable material or the microparticles are attached to a magnetic or magnetizable body and the microparticles with the substance immobilized thereupon are captured with the aid of a magnet submerged in the first vessel, the magnet along with the microparticles captured thereupon are transferred to the second vessel and released from the magnet's influence.