Adapter for holding a pair of centrifuge tubes

An adapter for supporting a pair of closed centrifuge tubes within a cavity of a vertical angle centrifuge rotor for rotation about an axis of rotation, the adapter comprising:

• a first, inboard, adapter segment and a second, outboard, adapter segment, each segment having an exterior surface and a mating surface thereon, each segment having a pair of indentations in the mating surface thereof, the indentations in each segment being shaped such that when the segments are joined along their mating surfaces the indentations cooperate to define a pair of recesses each able to totally surround a centrifuge tube disposed therein, each recess having an axis therethrough, the axes of the recesses being collinear and being parallel to the axis of rotation,
• the adapter segments being fabricated of a material that has sufficient strength to withstand vertical forces created by the pressure of a liquid in each tube while under centrifugation,
• at least the first, inboard, segment of the adapter having an effective weight sufficient to balance forces created by the pressure of a liquid carried in the tubes under centrifugation that act transversely to the axis of the recesses,
• so that, in use with the adapter inserted into a cavity of a rotor with the mating surfaces of the adapter segments being in contacting relationship with each other, the effective weight of the inboard segment while under centrifugation is sufficient to maintain the mating surfaces of the adapter segments in such contacting relationship.