Abstract: A culture medium preparator includes a cylindrical vessel that terminates at the low part in a substantially hemispherical cap, a lid and a stirrer placed in the vessel. The stirrer includes a vertical tube placed in the center of the vessel, a plurality of blades put into rotation about the tube and magnetic masses at the periphery so that they are placed in proximity to the internal wall of the vessel. The preparator furthermore includes a magnetic ring in rotation about the internal wall at the same height as the magnetic masses. The magnets attract the magnetic masses, the magnetic ring being moved in rotation by a motor. In this way, the stirrer is driven in rotation without requiring mechanical elements placed inside the vessel, the absence of such elements facilitating the cleaning.

Abstract: A culture medium preparator includes a cylindrical vessel that terminates at the low part in a substantially hemispherical cap, a lid and a stirrer placed in the vessel. The stirrer includes a vertical tube placed in the center of the vessel, a plurality of blades put into rotation about the tube and magnetic masses at the periphery so that they are placed in proximity to the internal wall of the vessel. The preparator furthermore includes a magnetic ring in rotation about the internal wall at the same height as the magnetic masses. The magnets attract the magnetic masses, the magnetic ring being moved in rotation by a motor. In this way, the stirrer is driven in rotation without requiring mechanical elements placed inside the vessel, the absence of such elements facilitating the cleaning.

Abstract: The present disclosure relates to an assembly formed from a planar rigid filtration membrane and generally flat plate for accommodating and supporting this membrane, to activate and/or reveal immobilized contaminants on the membrane, the support plate comprising a holding and immobilization device cooperating with a periphery of the membrane, wherein the device comprises at least one non-deformable member that projects from the general plane of the plate and at least one stop tab, substantially perpendicular to the plane, which is extended by a holding appendage substantially parallel to the plane, so that the membrane can be engaged with the member only through a first movement of the membrane substantially parallel to the plane of the support followed by a second movement substantially perpendicular to the plane.