Abstract: In a first aspect the present invention provides a screw-capped tube for holding a liquid material therein, the tube having an open mouth at one end only which is adapted to be closed by the screw cap with an inner end of the screw cap extending into the open mouth of the tube, an opposing end of the cap to the inner end of the cap being provided with a circular cylindrical recess extending thereinto and whereof the cylindrical wall of the recess is free of splines, an outer circumferential surface of the cap being provided with a spline whereby the cap is adapted to co-operatively engage with a spline of a tool that will fit on to said opposite end of the cap for rotation of the cap by co-operative engagement of the spline of the tool with the spline of the cap. This arrangement increases versatility and ease in de-capping and re-capping of the tubes. Further aspects also assist with this and/or improve seal efficiency and help to avoid the need for O ring sealing for cryogenic uses and other uses.

Abstract: A multiwell plate assembly comprising: (i) one or more plate top portions, each plate top portion comprising a plurality of wells for holding chemical reactants, and a substantially planar deck portion connecting said wells in an ordered array, said deck portion comprising a top surface, a bottom surface and a perimeter; (ii) a substantially rigid frame portion for holding said plate top portion(s), said frame portion comprising an inner surface, an outer surface, a top surface and a bottom surface, an aperture in said top surface being adapted to accommodate one or more plate top portions; (iii) securing means adapted to secure the plate top portion(s) to the frame portion.