Abstract: A cell cultivating device comprising superposed, separate partition wall members forming mutually spaced partition walls, which define superposed chambers for containing a cell cultivating medium therebetween. The superposed partition wall members each comprising said partition wall and an upstanding peripheral wall extending transversely thereto, are arranged within a closed outer container having a flat bottom wall and a flat end wall. A liquid cultivating medium may be introduced into the outer container through a filling opening while the container is in an upright position in which it is supported by the end wall. The liquid may then substantially uniformly distribute itself within the cultivating chambers via a tunnel extending along the end wall and interconnecting the cultivating chambers.

Abstract: A method for the production of a plastic container which includes an essentially planar base part and a detachable top part comprises placing a top part having a thin flange extending from an end face at an open end thereof on an essentially planar base part, vibrating the top part relative to the base part to melt the thin flange, and discontinuing the vibration before the thin flange has become completely molten. The resulting plastic container is both air- and liquid-proof, yet the top part is easily detachable from the base part.

Abstract: A cell cultivation container with screw cover, where the zone of the mouth portion of the container adjacent the edge of the mouth has a greater diameter than the more remote zone and is constructed with at least two inwardly protruding, axially extending projections, and where the screw cover has an inner skirt with an outer annular bead which in the fully closed position of the cover is in sealing engagement with the inner wall of the narrow zone of the mouth portion of the container, while in partly unscrewed position of the cover the bead is only in contact with the inwardly protruding, axially extending projections. Hereby the cross-sectional area of the communication passages between the interior of the container and the surroundings formed by partial unscrewing of the cover will remain constant, even if the angle of turning of the screw cover varies within wide limits.

Abstract: A method of sealing a cryogenic tube comprising the steps of inserting the tube into a tubular body made from a heat-shrinkable material and having a length greater than that of the receptacle, heating the tubular body to a temperature sufficiently high to effect shrinkage of the tubular body and compressing the ends of the tubular body to cause the opposite tube walls to melt together to form an envelope completely surrounding the receptacle.